Commit message: avcodec/webp: Always set pix_fmt

Fixes: out of array access
Fixes: 1434/clusterfuzz-testcase-minimized-6314998085189632
Fixes: 1435/clusterfuzz-testcase-minimized-6483783723253760

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
CVE: CVE-2017-9994
CWE: CWE-119
Vulnerability description: libavcodec/webp.c in FFmpeg before 2.8.12, 3.0.x before 3.0.8, 3.1.x before 3.1.8, 3.2.x before 3.2.5, and 3.3.x before 3.3.1 does not ensure that pix_fmt is set, which allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted file, related to the vp8_decode_mb_row_no_filter and pred8x8_128_dc_8_c functions.

Project: FFmpeg
File: vp8.c

void backup_mb_border(uint8_t *top_border, uint8_t *src_y,
                      uint8_t *src_cb, uint8_t *src_cr,
                      ptrdiff_t linesize, ptrdiff_t uvlinesize, int simple)
{
    AV_COPY128(top_border, src_y + 15 * linesize);
    if (!simple) {
        AV_COPY64(top_border + 16, src_cb + 7 * uvlinesize);
        AV_COPY64(top_border + 24, src_cr + 7 * uvlinesize);
    }
}

Project: FFmpeg
File: vp8.c

int check_dc_pred8x8_mode(int mode, int mb_x, int mb_y)
{
    if (!mb_x)
        return mb_y ? TOP_DC_PRED8x8 : DC_128_PRED8x8;
    else
        return mb_y ? mode : LEFT_DC_PRED8x8;
}

Project: FFmpeg
File: vp8.c

int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y,
                                     int *copy_buf, int vp7)
{
    switch (mode) {
    case VERT_PRED:
        if (!mb_x && mb_y) {
            *copy_buf = 1;
            return mode;
        }
        /* fall-through */
    case DIAG_DOWN_LEFT_PRED:
    case VERT_LEFT_PRED:
        return !mb_y ? (vp7 ? DC_128_PRED : DC_127_PRED) : mode;
    case HOR_PRED:
        if (!mb_y) {
            *copy_buf = 1;
            return mode;
        }
        /* fall-through */
    case HOR_UP_PRED:
        return !mb_x ? (vp7 ? DC_128_PRED : DC_129_PRED) : mode;
    case TM_VP8_PRED:
        return check_tm_pred4x4_mode(mode, mb_x, mb_y, vp7);
    case DC_PRED: /* 4x4 DC doesn't use the same "H.264-style" exceptions
                   * as 16x16/8x8 DC */
    case DIAG_DOWN_RIGHT_PRED:
    case VERT_RIGHT_PRED:
    case HOR_DOWN_PRED:
        if (!mb_y || !mb_x)
            *copy_buf = 1;
        return mode;
    }
    return mode;
}

Project: FFmpeg
File: vp8.c

int check_intra_pred8x8_mode_emuedge(int mode, int mb_x, int mb_y, int vp7)
{
    switch (mode) {
    case DC_PRED8x8:
        return check_dc_pred8x8_mode(mode, mb_x, mb_y);
    case VERT_PRED8x8:
        return !mb_y ? (vp7 ? DC_128_PRED8x8 : DC_127_PRED8x8) : mode;
    case HOR_PRED8x8:
        return !mb_x ? (vp7 ? DC_128_PRED8x8 : DC_129_PRED8x8) : mode;
    case PLANE_PRED8x8: /* TM */
        return check_tm_pred8x8_mode(mode, mb_x, mb_y, vp7);
    }
    return mode;
}

Project: FFmpeg
File: vp8.c

int check_tm_pred4x4_mode(int mode, int mb_x, int mb_y, int vp7)
{
    if (!mb_x) {
        return mb_y ? VERT_VP8_PRED : (vp7 ? DC_128_PRED : DC_129_PRED);
    } else {
        return mb_y ? mode : HOR_VP8_PRED;
    }
}

Project: FFmpeg
File: vp8.c

int check_tm_pred8x8_mode(int mode, int mb_x, int mb_y, int vp7)
{
    if (!mb_x)
        return mb_y ? VERT_PRED8x8 : (vp7 ? DC_128_PRED8x8 : DC_129_PRED8x8);
    else
        return mb_y ? mode : HOR_PRED8x8;
}

Project: FFmpeg
File: vp8.c

void clamp_mv(VP8mvbounds *s, VP56mv *dst, const VP56mv *src)
{
    dst->x = av_clip(src->x, av_clip(s->mv_min.x, INT16_MIN, INT16_MAX),
                             av_clip(s->mv_max.x, INT16_MIN, INT16_MAX));
    dst->y = av_clip(src->y, av_clip(s->mv_min.y, INT16_MIN, INT16_MAX),
                             av_clip(s->mv_max.y, INT16_MIN, INT16_MAX));
}

Project: FFmpeg
File: vp8.c

static void copy_chroma(AVFrame *dst, AVFrame *src, int width, int height)
{
    int i, j;

    for (j = 1; j < 3; j++) {
        for (i = 0; i < height / 2; i++)
            memcpy(dst->data[j] + i * dst->linesize[j],
                   src->data[j] + i * src->linesize[j], width / 2);
    }
}

Project: FFmpeg
File: vp8.c

int decode_block_coeffs(VP56RangeCoder *c, int16_t block[16],
                        uint8_t probs[16][3][NUM_DCT_TOKENS - 1],
                        int i, int zero_nhood, int16_t qmul[2],
                        const uint8_t scan[16], int vp7)
{
    uint8_t *token_prob = probs[i][zero_nhood];
    if (!vp56_rac_get_prob_branchy(c, token_prob[0]))   // DCT_EOB
        return 0;
    return vp7 ? vp7_decode_block_coeffs_internal(c, block, probs, i,
                                                  token_prob, qmul, scan)
               : vp8_decode_block_coeffs_internal(c, block, probs, i,
                                                  token_prob, qmul);
}

Project: FFmpeg

int decode_block_coeffs_internal(VP56RangeCoder *r, int16_t block[16],
                                 uint8_t probs[16][3][NUM_DCT_TOKENS - 1],
                                 int i, uint8_t *token_prob, int16_t qmul[2],
                                 const uint8_t scan[16], int vp7)
{
    VP56RangeCoder c = *r;
    goto skip_eob;
    do {
        int coeff;
restart:
        if (!vp56_rac_get_prob_branchy(&c, token_prob[0]))   // DCT_EOB
            break;

skip_eob:
        if (!vp56_rac_get_prob_branchy(&c, token_prob[1])) { // DCT_0
            if (++i == 16)
                break; // invalid input; blocks should end with EOB
            token_prob = probs[i][0];
            if (vp7)
                goto restart;
            goto skip_eob;
        }

        if (!vp56_rac_get_prob_branchy(&c, token_prob[2])) { // DCT_1
            coeff = 1;
            token_prob = probs[i + 1][1];
        } else {
            if (!vp56_rac_get_prob_branchy(&c, token_prob[3])) { // DCT 2,3,4
                coeff = vp56_rac_get_prob_branchy(&c, token_prob[4]);
                if (coeff)
                    coeff += vp56_rac_get_prob(&c, token_prob[5]);
                coeff += 2;
            } else {
                if (!vp56_rac_get_prob_branchy(&c, token_prob[6])) {
                    if (!vp56_rac_get_prob_branchy(&c, token_prob[7])) { // DCT_CAT1
                        coeff = 5 + vp56_rac_get_prob(&c, vp8_dct_cat1_prob[0]);
                    } else {                                    // DCT_CAT2
                        coeff  = 7;
                        coeff += vp56_rac_get_prob(&c, vp8_dct_cat2_prob[0]) << 1;
                        coeff += vp56_rac_get_prob(&c, vp8_dct_cat2_prob[1]);
                    }
                } else {    // DCT_CAT3 and up
                    int a   = vp56_rac_get_prob(&c, token_prob[8]);
                    int b   = vp56_rac_get_prob(&c, token_prob[9 + a]);
                    int cat = (a << 1) + b;
                    coeff  = 3 + (8 << cat);
                    coeff += vp8_rac_get_coeff(&c, ff_vp8_dct_cat_prob[cat]);
                }
            }
            token_prob = probs[i + 1][2];
        }
        block[scan[i]] = (vp8_rac_get(&c) ? -coeff : coeff) * qmul[!!i];
    } while (++i < 16);

    *r = c;
    return i;
}

Project: FFmpeg
File: vp8.c

void decode_intra4x4_modes(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,
                           int mb_x, int keyframe, int layout)
{
    uint8_t *intra4x4 = mb->intra4x4_pred_mode_mb;

    if (layout) {
        VP8Macroblock *mb_top = mb - s->mb_width - 1;
        memcpy(mb->intra4x4_pred_mode_top, mb_top->intra4x4_pred_mode_top, 4);
    }
    if (keyframe) {
        int x, y;
        uint8_t *top;
        uint8_t *const left = s->intra4x4_pred_mode_left;
        if (layout)
            top = mb->intra4x4_pred_mode_top;
        else
            top = s->intra4x4_pred_mode_top + 4 * mb_x;
        for (y = 0; y < 4; y++) {
            for (x = 0; x < 4; x++) {
                const uint8_t *ctx;
                ctx       = vp8_pred4x4_prob_intra[top[x]][left[y]];
                *intra4x4 = vp8_rac_get_tree(c, vp8_pred4x4_tree, ctx);
                left[y]   = top[x] = *intra4x4;
                intra4x4++;
            }
        }
    } else {
        int i;
        for (i = 0; i < 16; i++)
            intra4x4[i] = vp8_rac_get_tree(c, vp8_pred4x4_tree,
                                           vp8_pred4x4_prob_inter);
    }
}

Project: FFmpeg

void decode_mb_coeffs(VP8Context *s, VP8ThreadData *td, VP56RangeCoder *c,
                      VP8Macroblock *mb, uint8_t t_nnz[9], uint8_t l_nnz[9],
                      int is_vp7)
{
    int i, x, y, luma_start = 0, luma_ctx = 3;
    int nnz_pred, nnz, nnz_total = 0;
    int segment = mb->segment;
    int block_dc = 0;

    if (mb->mode != MODE_I4x4 && (is_vp7 || mb->mode != VP8_MVMODE_SPLIT)) {
        nnz_pred = t_nnz[8] + l_nnz[8];

        nnz = decode_block_coeffs(c, td->block_dc, s->prob->token[1], 0,
                                  nnz_pred, s->qmat[segment].luma_dc_qmul,
                                  ff_zigzag_scan, is_vp7);
        l_nnz[8] = t_nnz[8] = !!nnz;

        if (is_vp7 && mb->mode > MODE_I4x4) {
            nnz |=  inter_predict_dc(td->block_dc,
                                     s->inter_dc_pred[mb->ref_frame - 1]);
        }

        if (nnz) {
            nnz_total += nnz;
            block_dc   = 1;
            if (nnz == 1)
                s->vp8dsp.vp8_luma_dc_wht_dc(td->block, td->block_dc);
            else
                s->vp8dsp.vp8_luma_dc_wht(td->block, td->block_dc);
        }
        luma_start = 1;
        luma_ctx   = 0;
    }

    for (y = 0; y < 4; y++)
        for (x = 0; x < 4; x++) {
            nnz_pred = l_nnz[y] + t_nnz[x];
            nnz = decode_block_coeffs(c, td->block[y][x],
                                      s->prob->token[luma_ctx],
                                      luma_start, nnz_pred,
                                      s->qmat[segment].luma_qmul,
                                      s->prob[0].scan, is_vp7);
            /* nnz+block_dc may be one more than the actual last index,
             * but we don't care */
            td->non_zero_count_cache[y][x] = nnz + block_dc;
            t_nnz[x] = l_nnz[y] = !!nnz;
            nnz_total += nnz;
        }

    for (i = 4; i < 6; i++)
        for (y = 0; y < 2; y++)
            for (x = 0; x < 2; x++) {
                nnz_pred = l_nnz[i + 2 * y] + t_nnz[i + 2 * x];
                nnz = decode_block_coeffs(c, td->block[i][(y << 1) + x],
                                          s->prob->token[2], 0, nnz_pred,
                                          s->qmat[segment].chroma_qmul,
                                          s->prob[0].scan, is_vp7);
                td->non_zero_count_cache[i][(y << 1) + x] = nnz;
                t_nnz[i + 2 * x] = l_nnz[i + 2 * y] = !!nnz;
                nnz_total += nnz;
            }

    if (!nnz_total)
        mb->skip = 1;
}

Project: FFmpeg

void decode_mb_mode(VP8Context *s, VP8mvbounds *mv_bounds,
                    VP8Macroblock *mb, int mb_x, int mb_y,
                    uint8_t *segment, uint8_t *ref, int layout, int is_vp7)
{
    VP56RangeCoder *c = &s->c;
    static const char *vp7_feature_name[] = { "q-index",
                                              "lf-delta",
                                              "partial-golden-update",
                                              "blit-pitch" };
    if (is_vp7) {
        int i;
        *segment = 0;
        for (i = 0; i < 4; i++) {
            if (s->feature_enabled[i]) {
                if (vp56_rac_get_prob_branchy(c, s->feature_present_prob[i])) {
                      int index = vp8_rac_get_tree(c, vp7_feature_index_tree,
                                                   s->feature_index_prob[i]);
                      av_log(s->avctx, AV_LOG_WARNING,
                             "Feature %s present in macroblock (value 0x%x)\n",
                             vp7_feature_name[i], s->feature_value[i][index]);
                }
           }
        }
    } else if (s->segmentation.update_map) {
        int bit  = vp56_rac_get_prob(c, s->prob->segmentid[0]);
        *segment = vp56_rac_get_prob(c, s->prob->segmentid[1+bit]) + 2*bit;
    } else if (s->segmentation.enabled)
        *segment = ref ? *ref : *segment;
    mb->segment = *segment;

    mb->skip = s->mbskip_enabled ? vp56_rac_get_prob(c, s->prob->mbskip) : 0;

    if (s->keyframe) {
        mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_intra,
                                    vp8_pred16x16_prob_intra);

        if (mb->mode == MODE_I4x4) {
            decode_intra4x4_modes(s, c, mb, mb_x, 1, layout);
        } else {
            const uint32_t modes = (is_vp7 ? vp7_pred4x4_mode
                                           : vp8_pred4x4_mode)[mb->mode] * 0x01010101u;
            if (s->mb_layout)
                AV_WN32A(mb->intra4x4_pred_mode_top, modes);
            else
                AV_WN32A(s->intra4x4_pred_mode_top + 4 * mb_x, modes);
            AV_WN32A(s->intra4x4_pred_mode_left, modes);
        }

        mb->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree,
                                                vp8_pred8x8c_prob_intra);
        mb->ref_frame        = VP56_FRAME_CURRENT;
    } else if (vp56_rac_get_prob_branchy(c, s->prob->intra)) {
        if (vp56_rac_get_prob_branchy(c, s->prob->last))
            mb->ref_frame =
                (!is_vp7 && vp56_rac_get_prob(c, s->prob->golden)) ? VP56_FRAME_GOLDEN2 /* altref */
                                                                   : VP56_FRAME_GOLDEN;
        else
            mb->ref_frame = VP56_FRAME_PREVIOUS;
        s->ref_count[mb->ref_frame - 1]++;

        if (is_vp7)
            vp7_decode_mvs(s, mb, mb_x, mb_y, layout);
        else
            vp8_decode_mvs(s, mv_bounds, mb, mb_x, mb_y, layout);
    } else {
        mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_inter, s->prob->pred16x16);

        if (mb->mode == MODE_I4x4)
            decode_intra4x4_modes(s, c, mb, mb_x, 0, layout);

        mb->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree,
                                                s->prob->pred8x8c);
        mb->ref_frame        = VP56_FRAME_CURRENT;
        mb->partitioning     = VP8_SPLITMVMODE_NONE;
        AV_ZERO32(&mb->bmv[0]);
    }
}

Project: FFmpeg

static av_always_inline int decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
                                        int jobnr, int threadnr, int is_vp7)
{
    VP8Context *s = avctx->priv_data;
    VP8ThreadData *prev_td, *next_td, *td = &s->thread_data[threadnr];
    int mb_y = atomic_load(&td->thread_mb_pos) >> 16;
    int mb_x, mb_xy = mb_y * s->mb_width;
    int num_jobs = s->num_jobs;
    VP8Frame *curframe = s->curframe, *prev_frame = s->prev_frame;
    VP56RangeCoder *c  = &s->coeff_partition[mb_y & (s->num_coeff_partitions - 1)];
    VP8Macroblock *mb;
    uint8_t *dst[3] = {
        curframe->tf.f->data[0] + 16 * mb_y * s->linesize,
        curframe->tf.f->data[1] +  8 * mb_y * s->uvlinesize,
        curframe->tf.f->data[2] +  8 * mb_y * s->uvlinesize
    };

    if (c->end <= c->buffer && c->bits >= 0)
         return AVERROR_INVALIDDATA;

    if (mb_y == 0)
        prev_td = td;
    else
        prev_td = &s->thread_data[(jobnr + num_jobs - 1) % num_jobs];
    if (mb_y == s->mb_height - 1)
        next_td = td;
    else
        next_td = &s->thread_data[(jobnr + 1) % num_jobs];
    if (s->mb_layout == 1)
        mb = s->macroblocks_base + ((s->mb_width + 1) * (mb_y + 1) + 1);
    else {
        if (prev_frame && s->segmentation.enabled &&
            !s->segmentation.update_map)
            ff_thread_await_progress(&prev_frame->tf, mb_y, 0);
        mb = s->macroblocks + (s->mb_height - mb_y - 1) * 2;
        memset(mb - 1, 0, sizeof(*mb)); // zero left macroblock
        AV_WN32A(s->intra4x4_pred_mode_left, DC_PRED * 0x01010101);
    }

    if (!is_vp7 || mb_y == 0)
        memset(td->left_nnz, 0, sizeof(td->left_nnz));

    td->mv_bounds.mv_min.x = -MARGIN;
    td->mv_bounds.mv_max.x = ((s->mb_width - 1) << 6) + MARGIN;

    for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb_xy++, mb++) {
        if (c->end <= c->buffer && c->bits >= 0)
            return AVERROR_INVALIDDATA;
        if (prev_td != td) {
            if (threadnr != 0) {
                check_thread_pos(td, prev_td,
                                 mb_x + (is_vp7 ? 2 : 1),
                                 mb_y - (is_vp7 ? 2 : 1));
            } else {
                check_thread_pos(td, prev_td,
                                 mb_x + (is_vp7 ? 2 : 1) + s->mb_width + 3,
                                 mb_y - (is_vp7 ? 2 : 1));
            }
        }

        s->vdsp.prefetch(dst[0] + (mb_x & 3) * 4 * s->linesize + 64,
                         s->linesize, 4);
        s->vdsp.prefetch(dst[1] + (mb_x & 7) * s->uvlinesize + 64,
                         dst[2] - dst[1], 2);

        if (!s->mb_layout)
            decode_mb_mode(s, &td->mv_bounds, mb, mb_x, mb_y, curframe->seg_map->data + mb_xy,
                           prev_frame && prev_frame->seg_map ?
                           prev_frame->seg_map->data + mb_xy : NULL, 0, is_vp7);

        prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_PREVIOUS);

        if (!mb->skip)
            decode_mb_coeffs(s, td, c, mb, s->top_nnz[mb_x], td->left_nnz, is_vp7);

        if (mb->mode <= MODE_I4x4)
            intra_predict(s, td, dst, mb, mb_x, mb_y, is_vp7);
        else
            inter_predict(s, td, dst, mb, mb_x, mb_y);

        prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_GOLDEN);

        if (!mb->skip) {
            idct_mb(s, td, dst, mb);
        } else {
            AV_ZERO64(td->left_nnz);
            AV_WN64(s->top_nnz[mb_x], 0);   // array of 9, so unaligned

            /* Reset DC block predictors if they would exist
             * if the mb had coefficients */
            if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {
                td->left_nnz[8]     = 0;
                s->top_nnz[mb_x][8] = 0;
            }
        }

        if (s->deblock_filter)
            filter_level_for_mb(s, mb, &td->filter_strength[mb_x], is_vp7);

        if (s->deblock_filter && num_jobs != 1 && threadnr == num_jobs - 1) {
            if (s->filter.simple)
                backup_mb_border(s->top_border[mb_x + 1], dst[0],
                                 NULL, NULL, s->linesize, 0, 1);
            else
                backup_mb_border(s->top_border[mb_x + 1], dst[0],
                                 dst[1], dst[2], s->linesize, s->uvlinesize, 0);
        }

        prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_GOLDEN2);

        dst[0]      += 16;
        dst[1]      += 8;
        dst[2]      += 8;
        td->mv_bounds.mv_min.x -= 64;
        td->mv_bounds.mv_max.x -= 64;

        if (mb_x == s->mb_width + 1) {
            update_pos(td, mb_y, s->mb_width + 3);
        } else {
            update_pos(td, mb_y, mb_x);
        }
    }
    return 0;
}

Project: FFmpeg
File: vp8.c

int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,
                    int layout, int is_vp7)
{
    int part_idx;
    int n, num;
    VP8Macroblock *top_mb;
    VP8Macroblock *left_mb = &mb[-1];
    const uint8_t *mbsplits_left = vp8_mbsplits[left_mb->partitioning];
    const uint8_t *mbsplits_top, *mbsplits_cur, *firstidx;
    VP56mv *top_mv;
    VP56mv *left_mv = left_mb->bmv;
    VP56mv *cur_mv  = mb->bmv;

    if (!layout) // layout is inlined, s->mb_layout is not
        top_mb = &mb[2];
    else
        top_mb = &mb[-s->mb_width - 1];
    mbsplits_top = vp8_mbsplits[top_mb->partitioning];
    top_mv       = top_mb->bmv;

    if (vp56_rac_get_prob_branchy(c, vp8_mbsplit_prob[0])) {
        if (vp56_rac_get_prob_branchy(c, vp8_mbsplit_prob[1]))
            part_idx = VP8_SPLITMVMODE_16x8 + vp56_rac_get_prob(c, vp8_mbsplit_prob[2]);
        else
            part_idx = VP8_SPLITMVMODE_8x8;
    } else {
        part_idx = VP8_SPLITMVMODE_4x4;
    }

    num              = vp8_mbsplit_count[part_idx];
    mbsplits_cur     = vp8_mbsplits[part_idx],
    firstidx         = vp8_mbfirstidx[part_idx];
    mb->partitioning = part_idx;

    for (n = 0; n < num; n++) {
        int k = firstidx[n];
        uint32_t left, above;
        const uint8_t *submv_prob;

        if (!(k & 3))
            left = AV_RN32A(&left_mv[mbsplits_left[k + 3]]);
        else
            left = AV_RN32A(&cur_mv[mbsplits_cur[k - 1]]);
        if (k <= 3)
            above = AV_RN32A(&top_mv[mbsplits_top[k + 12]]);
        else
            above = AV_RN32A(&cur_mv[mbsplits_cur[k - 4]]);

        submv_prob = get_submv_prob(left, above, is_vp7);

        if (vp56_rac_get_prob_branchy(c, submv_prob[0])) {
            if (vp56_rac_get_prob_branchy(c, submv_prob[1])) {
                if (vp56_rac_get_prob_branchy(c, submv_prob[2])) {
                    mb->bmv[n].y = mb->mv.y +
                                   read_mv_component(c, s->prob->mvc[0], is_vp7);
                    mb->bmv[n].x = mb->mv.x +
                                   read_mv_component(c, s->prob->mvc[1], is_vp7);
                } else {
                    AV_ZERO32(&mb->bmv[n]);
                }
            } else {
                AV_WN32A(&mb->bmv[n], above);
            }
        } else {
            AV_WN32A(&mb->bmv[n], left);
        }
    }

    return num;
}

Project: FFmpeg
File: vp8.c

static void fade(uint8_t *dst, ptrdiff_t dst_linesize,
                 const uint8_t *src, ptrdiff_t src_linesize,
                 int width, int height,
                 int alpha, int beta)
{
    int i, j;
    for (j = 0; j < height; j++) {
        for (i = 0; i < width; i++) {
            uint8_t y = src[j * src_linesize + i];
            dst[j * dst_linesize + i] = av_clip_uint8(y + ((y * beta) >> 8) + alpha);
        }
    }
}

Project: FFmpeg
File: vp8.c

av_cold int ff_vp8_decode_free(AVCodecContext *avctx)
{
    VP8Context *s = avctx->priv_data;
    int i;

    if (!s)
        return 0;

    vp8_decode_flush_impl(avctx, 1);
    for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++)
        av_frame_free(&s->frames[i].tf.f);

    return 0;
}

Project: FFmpeg
File: vp8.c

av_cold int ff_vp8_decode_init(AVCodecContext *avctx)
{
    return vp78_decode_init(avctx, IS_VP8);
}

Project: FFmpeg
File: vp8.c

void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb,
                         VP8FilterStrength *f, int is_vp7)
{
    int interior_limit, filter_level;

    if (s->segmentation.enabled) {
        filter_level = s->segmentation.filter_level[mb->segment];
        if (!s->segmentation.absolute_vals)
            filter_level += s->filter.level;
    } else
        filter_level = s->filter.level;

    if (s->lf_delta.enabled) {
        filter_level += s->lf_delta.ref[mb->ref_frame];
        filter_level += s->lf_delta.mode[mb->mode];
    }

    filter_level = av_clip_uintp2(filter_level, 6);

    interior_limit = filter_level;
    if (s->filter.sharpness) {
        interior_limit >>= (s->filter.sharpness + 3) >> 2;
        interior_limit = FFMIN(interior_limit, 9 - s->filter.sharpness);
    }
    interior_limit = FFMAX(interior_limit, 1);

    f->filter_level = filter_level;
    f->inner_limit = interior_limit;
    f->inner_filter = is_vp7 || !mb->skip || mb->mode == MODE_I4x4 ||
                      mb->mode == VP8_MVMODE_SPLIT;
}

Project: FFmpeg
File: vp8.c

void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f,
               int mb_x, int mb_y, int is_vp7)
{
    int mbedge_lim, bedge_lim_y, bedge_lim_uv, hev_thresh;
    int filter_level = f->filter_level;
    int inner_limit = f->inner_limit;
    int inner_filter = f->inner_filter;
    ptrdiff_t linesize   = s->linesize;
    ptrdiff_t uvlinesize = s->uvlinesize;
    static const uint8_t hev_thresh_lut[2][64] = {
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
          2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
          3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
          3, 3, 3, 3 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
          1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
          2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
          2, 2, 2, 2 }
    };

    if (!filter_level)
        return;

    if (is_vp7) {
        bedge_lim_y  = filter_level;
        bedge_lim_uv = filter_level * 2;
        mbedge_lim   = filter_level + 2;
    } else {
        bedge_lim_y  =
        bedge_lim_uv = filter_level * 2 + inner_limit;
        mbedge_lim   = bedge_lim_y + 4;
    }

    hev_thresh = hev_thresh_lut[s->keyframe][filter_level];

    if (mb_x) {
        s->vp8dsp.vp8_h_loop_filter16y(dst[0], linesize,
                                       mbedge_lim, inner_limit, hev_thresh);
        s->vp8dsp.vp8_h_loop_filter8uv(dst[1], dst[2], uvlinesize,
                                       mbedge_lim, inner_limit, hev_thresh);
    }

#define H_LOOP_FILTER_16Y_INNER(cond)                                         \
    if (cond && inner_filter) {                                               \
        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0] +  4, linesize,           \
                                             bedge_lim_y, inner_limit,        \
                                             hev_thresh);                     \
        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0] +  8, linesize,           \
                                             bedge_lim_y, inner_limit,        \
                                             hev_thresh);                     \
        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0] + 12, linesize,           \
                                             bedge_lim_y, inner_limit,        \
                                             hev_thresh);                     \
        s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] +  4, dst[2] + 4,         \
                                             uvlinesize,  bedge_lim_uv,       \
                                             inner_limit, hev_thresh);        \
    }

    H_LOOP_FILTER_16Y_INNER(!is_vp7)

    if (mb_y) {
        s->vp8dsp.vp8_v_loop_filter16y(dst[0], linesize,
                                       mbedge_lim, inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter8uv(dst[1], dst[2], uvlinesize,
                                       mbedge_lim, inner_limit, hev_thresh);
    }

    if (inner_filter) {
        s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0] +  4 * linesize,
                                             linesize, bedge_lim_y,
                                             inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0] +  8 * linesize,
                                             linesize, bedge_lim_y,
                                             inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0] + 12 * linesize,
                                             linesize, bedge_lim_y,
                                             inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] +  4 * uvlinesize,
                                             dst[2] +  4 * uvlinesize,
                                             uvlinesize, bedge_lim_uv,
                                             inner_limit, hev_thresh);
    }

    H_LOOP_FILTER_16Y_INNER(is_vp7)
}

Project: FFmpeg
File: vp8.c

static av_always_inline void filter_mb_row(AVCodecContext *avctx, void *tdata,
                              int jobnr, int threadnr, int is_vp7)
{
    VP8Context *s = avctx->priv_data;
    VP8ThreadData *td = &s->thread_data[threadnr];
    int mb_x, mb_y = atomic_load(&td->thread_mb_pos) >> 16, num_jobs = s->num_jobs;
    AVFrame *curframe = s->curframe->tf.f;
    VP8Macroblock *mb;
    VP8ThreadData *prev_td, *next_td;
    uint8_t *dst[3] = {
        curframe->data[0] + 16 * mb_y * s->linesize,
        curframe->data[1] +  8 * mb_y * s->uvlinesize,
        curframe->data[2] +  8 * mb_y * s->uvlinesize
    };

    if (s->mb_layout == 1)
        mb = s->macroblocks_base + ((s->mb_width + 1) * (mb_y + 1) + 1);
    else
        mb = s->macroblocks + (s->mb_height - mb_y - 1) * 2;

    if (mb_y == 0)
        prev_td = td;
    else
        prev_td = &s->thread_data[(jobnr + num_jobs - 1) % num_jobs];
    if (mb_y == s->mb_height - 1)
        next_td = td;
    else
        next_td = &s->thread_data[(jobnr + 1) % num_jobs];

    for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb++) {
        VP8FilterStrength *f = &td->filter_strength[mb_x];
        if (prev_td != td)
            check_thread_pos(td, prev_td,
                             (mb_x + 1) + (s->mb_width + 3), mb_y - 1);
        if (next_td != td)
            if (next_td != &s->thread_data[0])
                check_thread_pos(td, next_td, mb_x + 1, mb_y + 1);

        if (num_jobs == 1) {
            if (s->filter.simple)
                backup_mb_border(s->top_border[mb_x + 1], dst[0],
                                 NULL, NULL, s->linesize, 0, 1);
            else
                backup_mb_border(s->top_border[mb_x + 1], dst[0],
                                 dst[1], dst[2], s->linesize, s->uvlinesize, 0);
        }

        if (s->filter.simple)
            filter_mb_simple(s, dst[0], f, mb_x, mb_y);
        else
            filter_mb(s, dst, f, mb_x, mb_y, is_vp7);
        dst[0] += 16;
        dst[1] += 8;
        dst[2] += 8;

        update_pos(td, mb_y, (s->mb_width + 3) + mb_x);
    }
}

Project: FFmpeg
File: vp8.c

void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f,
                      int mb_x, int mb_y)
{
    int mbedge_lim, bedge_lim;
    int filter_level = f->filter_level;
    int inner_limit  = f->inner_limit;
    int inner_filter = f->inner_filter;
    ptrdiff_t linesize = s->linesize;

    if (!filter_level)
        return;

    bedge_lim  = 2 * filter_level + inner_limit;
    mbedge_lim = bedge_lim + 4;

    if (mb_x)
        s->vp8dsp.vp8_h_loop_filter_simple(dst, linesize, mbedge_lim);
    if (inner_filter) {
        s->vp8dsp.vp8_h_loop_filter_simple(dst +  4, linesize, bedge_lim);
        s->vp8dsp.vp8_h_loop_filter_simple(dst +  8, linesize, bedge_lim);
        s->vp8dsp.vp8_h_loop_filter_simple(dst + 12, linesize, bedge_lim);
    }

    if (mb_y)
        s->vp8dsp.vp8_v_loop_filter_simple(dst, linesize, mbedge_lim);
    if (inner_filter) {
        s->vp8dsp.vp8_v_loop_filter_simple(dst +  4 * linesize, linesize, bedge_lim);
        s->vp8dsp.vp8_v_loop_filter_simple(dst +  8 * linesize, linesize, bedge_lim);
        s->vp8dsp.vp8_v_loop_filter_simple(dst + 12 * linesize, linesize, bedge_lim);
    }
}

Project: FFmpeg
File: vp8.c

static void free_buffers(VP8Context *s)
{
    int i;
    if (s->thread_data)
        for (i = 0; i < MAX_THREADS; i++) {
#if HAVE_THREADS
            pthread_cond_destroy(&s->thread_data[i].cond);
            pthread_mutex_destroy(&s->thread_data[i].lock);
#endif
            av_freep(&s->thread_data[i].filter_strength);
        }
    av_freep(&s->thread_data);
    av_freep(&s->macroblocks_base);
    av_freep(&s->intra4x4_pred_mode_top);
    av_freep(&s->top_nnz);
    av_freep(&s->top_border);

    s->macroblocks = NULL;
}

Project: FFmpeg
File: vp8.c

static const VP56mv *get_bmv_ptr(const VP8Macroblock *mb, int subblock)
{
    return &mb->bmv[mb->mode == VP8_MVMODE_SPLIT ? vp8_mbsplits[mb->partitioning][subblock] : 0];
}

Project: FFmpeg
File: vp8.c

const uint8_t *get_submv_prob(uint32_t left, uint32_t top, int is_vp7)
{
    if (is_vp7)
        return vp7_submv_prob;

    if (left == top)
        return vp8_submv_prob[4 - !!left];
    if (!top)
        return vp8_submv_prob[2];
    return vp8_submv_prob[1 - !!left];
}

Project: FFmpeg
File: vp8.c

void idct_mb(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3], VP8Macroblock *mb)
{
    int x, y, ch;

    if (mb->mode != MODE_I4x4) {
        uint8_t *y_dst = dst[0];
        for (y = 0; y < 4; y++) {
            uint32_t nnz4 = AV_RL32(td->non_zero_count_cache[y]);
            if (nnz4) {
                if (nnz4 & ~0x01010101) {
                    for (x = 0; x < 4; x++) {
                        if ((uint8_t) nnz4 == 1)
                            s->vp8dsp.vp8_idct_dc_add(y_dst + 4 * x,
                                                      td->block[y][x],
                                                      s->linesize);
                        else if ((uint8_t) nnz4 > 1)
                            s->vp8dsp.vp8_idct_add(y_dst + 4 * x,
                                                   td->block[y][x],
                                                   s->linesize);
                        nnz4 >>= 8;
                        if (!nnz4)
                            break;
                    }
                } else {
                    s->vp8dsp.vp8_idct_dc_add4y(y_dst, td->block[y], s->linesize);
                }
            }
            y_dst += 4 * s->linesize;
        }
    }

    for (ch = 0; ch < 2; ch++) {
        uint32_t nnz4 = AV_RL32(td->non_zero_count_cache[4 + ch]);
        if (nnz4) {
            uint8_t *ch_dst = dst[1 + ch];
            if (nnz4 & ~0x01010101) {
                for (y = 0; y < 2; y++) {
                    for (x = 0; x < 2; x++) {
                        if ((uint8_t) nnz4 == 1)
                            s->vp8dsp.vp8_idct_dc_add(ch_dst + 4 * x,
                                                      td->block[4 + ch][(y << 1) + x],
                                                      s->uvlinesize);
                        else if ((uint8_t) nnz4 > 1)
                            s->vp8dsp.vp8_idct_add(ch_dst + 4 * x,
                                                   td->block[4 + ch][(y << 1) + x],
                                                   s->uvlinesize);
                        nnz4 >>= 8;
                        if (!nnz4)
                            goto chroma_idct_end;
                    }
                    ch_dst += 4 * s->uvlinesize;
                }
            } else {
                s->vp8dsp.vp8_idct_dc_add4uv(ch_dst, td->block[4 + ch], s->uvlinesize);
            }
        }
chroma_idct_end:
        ;
    }
}

Project: FFmpeg
File: vp8.c

void inter_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                   VP8Macroblock *mb, int mb_x, int mb_y)
{
    int x_off = mb_x << 4, y_off = mb_y << 4;
    int width = 16 * s->mb_width, height = 16 * s->mb_height;
    ThreadFrame *ref = &s->framep[mb->ref_frame]->tf;
    VP56mv *bmv = mb->bmv;

    switch (mb->partitioning) {
    case VP8_SPLITMVMODE_NONE:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 16, 16, width, height, &mb->mv);
        break;
    case VP8_SPLITMVMODE_4x4: {
        int x, y;
        VP56mv uvmv;

        /* Y */
        for (y = 0; y < 4; y++) {
            for (x = 0; x < 4; x++) {
                vp8_mc_luma(s, td, dst[0] + 4 * y * s->linesize + x * 4,
                            ref, &bmv[4 * y + x],
                            4 * x + x_off, 4 * y + y_off, 4, 4,
                            width, height, s->linesize,
                            s->put_pixels_tab[2]);
            }
        }

        /* U/V */
        x_off  >>= 1;
        y_off  >>= 1;
        width  >>= 1;
        height >>= 1;
        for (y = 0; y < 2; y++) {
            for (x = 0; x < 2; x++) {
                uvmv.x = mb->bmv[2 * y       * 4 + 2 * x    ].x +
                         mb->bmv[2 * y       * 4 + 2 * x + 1].x +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x    ].x +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x + 1].x;
                uvmv.y = mb->bmv[2 * y       * 4 + 2 * x    ].y +
                         mb->bmv[2 * y       * 4 + 2 * x + 1].y +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x    ].y +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x + 1].y;
                uvmv.x = (uvmv.x + 2 + FF_SIGNBIT(uvmv.x)) >> 2;
                uvmv.y = (uvmv.y + 2 + FF_SIGNBIT(uvmv.y)) >> 2;
                if (s->profile == 3) {
                    uvmv.x &= ~7;
                    uvmv.y &= ~7;
                }
                vp8_mc_chroma(s, td, dst[1] + 4 * y * s->uvlinesize + x * 4,
                              dst[2] + 4 * y * s->uvlinesize + x * 4, ref,
                              &uvmv, 4 * x + x_off, 4 * y + y_off, 4, 4,
                              width, height, s->uvlinesize,
                              s->put_pixels_tab[2]);
            }
        }
        break;
    }
    case VP8_SPLITMVMODE_16x8:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 16, 8, width, height, &bmv[0]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 8, 16, 8, width, height, &bmv[1]);
        break;
    case VP8_SPLITMVMODE_8x16:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 8, 16, width, height, &bmv[0]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    8, 0, 8, 16, width, height, &bmv[1]);
        break;
    case VP8_SPLITMVMODE_8x8:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 8, 8, width, height, &bmv[0]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    8, 0, 8, 8, width, height, &bmv[1]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 8, 8, 8, width, height, &bmv[2]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    8, 8, 8, 8, width, height, &bmv[3]);
        break;
    }
}

Project: FFmpeg
File: vp8.c

int inter_predict_dc(int16_t block[16], int16_t pred[2])
{
    int16_t dc = block[0];
    int ret = 0;

    if (pred[1] > 3) {
        dc += pred[0];
        ret = 1;
    }

    if (!pred[0] | !dc | ((int32_t)pred[0] ^ (int32_t)dc) >> 31) {
        block[0] = pred[0] = dc;
        pred[1] = 0;
    } else {
        if (pred[0] == dc)
            pred[1]++;
        block[0] = pred[0] = dc;
    }

    return ret;
}

Project: FFmpeg

void intra_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                   VP8Macroblock *mb, int mb_x, int mb_y, int is_vp7)
{
    int x, y, mode, nnz;
    uint32_t tr;

    /* for the first row, we need to run xchg_mb_border to init the top edge
     * to 127 otherwise, skip it if we aren't going to deblock */
    if (mb_y && (s->deblock_filter || !mb_y) && td->thread_nr == 0)
        xchg_mb_border(s->top_border[mb_x + 1], dst[0], dst[1], dst[2],
                       s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,
                       s->filter.simple, 1);

    if (mb->mode < MODE_I4x4) {
        mode = check_intra_pred8x8_mode_emuedge(mb->mode, mb_x, mb_y, is_vp7);
        s->hpc.pred16x16[mode](dst[0], s->linesize);
    } else {
        uint8_t *ptr = dst[0];
        uint8_t *intra4x4 = mb->intra4x4_pred_mode_mb;
        const uint8_t lo = is_vp7 ? 128 : 127;
        const uint8_t hi = is_vp7 ? 128 : 129;
        uint8_t tr_top[4] = { lo, lo, lo, lo };

        uint8_t *tr_right = ptr - s->linesize + 16;

        if (mb_y && mb_x == s->mb_width - 1) {
            tr       = tr_right[-1] * 0x01010101u;
            tr_right = (uint8_t *) &tr;
        }

        if (mb->skip)
            AV_ZERO128(td->non_zero_count_cache);

        for (y = 0; y < 4; y++) {
            uint8_t *topright = ptr + 4 - s->linesize;
            for (x = 0; x < 4; x++) {
                int copy = 0;
                ptrdiff_t linesize = s->linesize;
                uint8_t *dst = ptr + 4 * x;
                LOCAL_ALIGNED(4, uint8_t, copy_dst, [5 * 8]);

                if ((y == 0 || x == 3) && mb_y == 0) {
                    topright = tr_top;
                } else if (x == 3)
                    topright = tr_right;

                mode = check_intra_pred4x4_mode_emuedge(intra4x4[x], mb_x + x,
                                                        mb_y + y, &copy, is_vp7);
                if (copy) {
                    dst      = copy_dst + 12;
                    linesize = 8;
                    if (!(mb_y + y)) {
                        copy_dst[3] = lo;
                        AV_WN32A(copy_dst + 4, lo * 0x01010101U);
                    } else {
                        AV_COPY32(copy_dst + 4, ptr + 4 * x - s->linesize);
                        if (!(mb_x + x)) {
                            copy_dst[3] = hi;
                        } else {
                            copy_dst[3] = ptr[4 * x - s->linesize - 1];
                        }
                    }
                    if (!(mb_x + x)) {
                        copy_dst[11] =
                        copy_dst[19] =
                        copy_dst[27] =
                        copy_dst[35] = hi;
                    } else {
                        copy_dst[11] = ptr[4 * x                   - 1];
                        copy_dst[19] = ptr[4 * x + s->linesize     - 1];
                        copy_dst[27] = ptr[4 * x + s->linesize * 2 - 1];
                        copy_dst[35] = ptr[4 * x + s->linesize * 3 - 1];
                    }
                }
                s->hpc.pred4x4[mode](dst, topright, linesize);
                if (copy) {
                    AV_COPY32(ptr + 4 * x,                   copy_dst + 12);
                    AV_COPY32(ptr + 4 * x + s->linesize,     copy_dst + 20);
                    AV_COPY32(ptr + 4 * x + s->linesize * 2, copy_dst + 28);
                    AV_COPY32(ptr + 4 * x + s->linesize * 3, copy_dst + 36);
                }

                nnz = td->non_zero_count_cache[y][x];
                if (nnz) {
                    if (nnz == 1)
                        s->vp8dsp.vp8_idct_dc_add(ptr + 4 * x,
                                                  td->block[y][x], s->linesize);
                    else
                        s->vp8dsp.vp8_idct_add(ptr + 4 * x,
                                               td->block[y][x], s->linesize);
                }
                topright += 4;
            }

            ptr      += 4 * s->linesize;
            intra4x4 += 4;
        }
    }

    mode = check_intra_pred8x8_mode_emuedge(mb->chroma_pred_mode,
                                            mb_x, mb_y, is_vp7);
    s->hpc.pred8x8[mode](dst[1], s->uvlinesize);
    s->hpc.pred8x8[mode](dst[2], s->uvlinesize);

    if (mb_y && (s->deblock_filter || !mb_y) && td->thread_nr == 0)
        xchg_mb_border(s->top_border[mb_x + 1], dst[0], dst[1], dst[2],
                       s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,
                       s->filter.simple, 0);
}

Project: FFmpeg
File: vp8.c

static void parse_segment_info(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;
    int i;

    s->segmentation.update_map = vp8_rac_get(c);

    if (vp8_rac_get(c)) { // update segment feature data
        s->segmentation.absolute_vals = vp8_rac_get(c);

        for (i = 0; i < 4; i++)
            s->segmentation.base_quant[i]   = vp8_rac_get_sint(c, 7);

        for (i = 0; i < 4; i++)
            s->segmentation.filter_level[i] = vp8_rac_get_sint(c, 6);
    }
    if (s->segmentation.update_map)
        for (i = 0; i < 3; i++)
            s->prob->segmentid[i] = vp8_rac_get(c) ? vp8_rac_get_uint(c, 8) : 255;
}

Project: FFmpeg
File: vp8.c

void prefetch_motion(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
                     int mb_xy, int ref)
{
    /* Don't prefetch refs that haven't been used very often this frame. */
    if (s->ref_count[ref - 1] > (mb_xy >> 5)) {
        int x_off = mb_x << 4, y_off = mb_y << 4;
        int mx = (mb->mv.x >> 2) + x_off + 8;
        int my = (mb->mv.y >> 2) + y_off;
        uint8_t **src = s->framep[ref]->tf.f->data;
        int off = mx + (my + (mb_x & 3) * 4) * s->linesize + 64;
        /* For threading, a ff_thread_await_progress here might be useful, but
         * it actually slows down the decoder. Since a bad prefetch doesn't
         * generate bad decoder output, we don't run it here. */
        s->vdsp.prefetch(src[0] + off, s->linesize, 4);
        off = (mx >> 1) + ((my >> 1) + (mb_x & 7)) * s->uvlinesize + 64;
        s->vdsp.prefetch(src[1] + off, src[2] - src[1], 2);
    }
}

Project: FFmpeg

static av_always_inline int read_mv_component(VP56RangeCoder *c, const uint8_t *p, int vp7)
{
    int bit, x = 0;

    if (vp56_rac_get_prob_branchy(c, p[0])) {
        int i;

        for (i = 0; i < 3; i++)
            x += vp56_rac_get_prob(c, p[9 + i]) << i;
        for (i = (vp7 ? 7 : 9); i > 3; i--)
            x += vp56_rac_get_prob(c, p[9 + i]) << i;
        if (!(x & (vp7 ? 0xF0 : 0xFFF0)) || vp56_rac_get_prob(c, p[12]))
            x += 8;
    } else {
        const uint8_t *ps = p + 2;
        bit = vp56_rac_get_prob(c, *ps);
        ps += 1 + 3 * bit;
        x  += 4 * bit;
        bit = vp56_rac_get_prob(c, *ps);
        ps += 1 + bit;
        x  += 2 * bit;
        x  += vp56_rac_get_prob(c, *ps);
    }

    return (x && vp56_rac_get_prob(c, p[1])) ? -x : x;
}

Project: FFmpeg
File: vp8.c

static VP56Frame ref_to_update(VP8Context *s, int update, VP56Frame ref)
{
    VP56RangeCoder *c = &s->c;

    if (update)
        return VP56_FRAME_CURRENT;

    switch (vp8_rac_get_uint(c, 2)) {
    case 1:
        return VP56_FRAME_PREVIOUS;
    case 2:
        return (ref == VP56_FRAME_GOLDEN) ? VP56_FRAME_GOLDEN2 : VP56_FRAME_GOLDEN;
    }
    return VP56_FRAME_NONE;
}

Project: FFmpeg
File: vp8.c

static int setup_partitions(VP8Context *s, const uint8_t *buf, int buf_size)
{
    const uint8_t *sizes = buf;
    int i;
    int ret;

    s->num_coeff_partitions = 1 << vp8_rac_get_uint(&s->c, 2);

    buf      += 3 * (s->num_coeff_partitions - 1);
    buf_size -= 3 * (s->num_coeff_partitions - 1);
    if (buf_size < 0)
        return -1;

    for (i = 0; i < s->num_coeff_partitions - 1; i++) {
        int size = AV_RL24(sizes + 3 * i);
        if (buf_size - size < 0)
            return -1;

        ret = ff_vp56_init_range_decoder(&s->coeff_partition[i], buf, size);
        if (ret < 0)
            return ret;
        buf      += size;
        buf_size -= size;
    }
    return ff_vp56_init_range_decoder(&s->coeff_partition[i], buf, buf_size);
}

Project: FFmpeg
File: vp8.c

int update_dimensions(VP8Context *s, int width, int height, int is_vp7)
{
    AVCodecContext *avctx = s->avctx;
    int i, ret;

    if (width  != s->avctx->width || ((width+15)/16 != s->mb_width || (height+15)/16 != s->mb_height) && s->macroblocks_base ||
        height != s->avctx->height) {
        vp8_decode_flush_impl(s->avctx, 1);

        ret = ff_set_dimensions(s->avctx, width, height);
        if (ret < 0)
            return ret;
    }

    s->mb_width  = (s->avctx->coded_width  + 15) / 16;
    s->mb_height = (s->avctx->coded_height + 15) / 16;

    s->mb_layout = is_vp7 || avctx->active_thread_type == FF_THREAD_SLICE &&
                   avctx->thread_count > 1;
    if (!s->mb_layout) { // Frame threading and one thread
        s->macroblocks_base       = av_mallocz((s->mb_width + s->mb_height * 2 + 1) *
                                               sizeof(*s->macroblocks));
        s->intra4x4_pred_mode_top = av_mallocz(s->mb_width * 4);
    } else // Sliced threading
        s->macroblocks_base = av_mallocz((s->mb_width + 2) * (s->mb_height + 2) *
                                         sizeof(*s->macroblocks));
    s->top_nnz     = av_mallocz(s->mb_width * sizeof(*s->top_nnz));
    s->top_border  = av_mallocz((s->mb_width + 1) * sizeof(*s->top_border));
    s->thread_data = av_mallocz(MAX_THREADS * sizeof(VP8ThreadData));

    if (!s->macroblocks_base || !s->top_nnz || !s->top_border ||
        !s->thread_data || (!s->intra4x4_pred_mode_top && !s->mb_layout)) {
        free_buffers(s);
        return AVERROR(ENOMEM);
    }

    for (i = 0; i < MAX_THREADS; i++) {
        s->thread_data[i].filter_strength =
            av_mallocz(s->mb_width * sizeof(*s->thread_data[0].filter_strength));
        if (!s->thread_data[i].filter_strength) {
            free_buffers(s);
            return AVERROR(ENOMEM);
        }
#if HAVE_THREADS
        pthread_mutex_init(&s->thread_data[i].lock, NULL);
        pthread_cond_init(&s->thread_data[i].cond, NULL);
#endif
    }

    s->macroblocks = s->macroblocks_base + 1;

    return 0;
}

Project: FFmpeg
File: vp8.c

static void update_lf_deltas(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;
    int i;

    for (i = 0; i < 4; i++) {
        if (vp8_rac_get(c)) {
            s->lf_delta.ref[i] = vp8_rac_get_uint(c, 6);

            if (vp8_rac_get(c))
                s->lf_delta.ref[i] = -s->lf_delta.ref[i];
        }
    }

    for (i = MODE_I4x4; i <= VP8_MVMODE_SPLIT; i++) {
        if (vp8_rac_get(c)) {
            s->lf_delta.mode[i] = vp8_rac_get_uint(c, 6);

            if (vp8_rac_get(c))
                s->lf_delta.mode[i] = -s->lf_delta.mode[i];
        }
    }
}

Project: FFmpeg
File: vp8.c

static void update_refs(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;

    int update_golden = vp8_rac_get(c);
    int update_altref = vp8_rac_get(c);

    s->update_golden = ref_to_update(s, update_golden, VP56_FRAME_GOLDEN);
    s->update_altref = ref_to_update(s, update_altref, VP56_FRAME_GOLDEN2);
}

Project: FFmpeg
File: vp8.c

int vp78_decode_init(AVCodecContext *avctx, int is_vp7)
{
    VP8Context *s = avctx->priv_data;
    int ret;

    s->avctx = avctx;
    s->vp7   = avctx->codec->id == AV_CODEC_ID_VP7;
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
    avctx->internal->allocate_progress = 1;

    ff_videodsp_init(&s->vdsp, 8);

    ff_vp78dsp_init(&s->vp8dsp);
    if (CONFIG_VP7_DECODER && is_vp7) {
        ff_h264_pred_init(&s->hpc, AV_CODEC_ID_VP7, 8, 1);
        ff_vp7dsp_init(&s->vp8dsp);
        s->decode_mb_row_no_filter = vp7_decode_mb_row_no_filter;
        s->filter_mb_row           = vp7_filter_mb_row;
    } else if (CONFIG_VP8_DECODER && !is_vp7) {
        ff_h264_pred_init(&s->hpc, AV_CODEC_ID_VP8, 8, 1);
        ff_vp8dsp_init(&s->vp8dsp);
        s->decode_mb_row_no_filter = vp8_decode_mb_row_no_filter;
        s->filter_mb_row           = vp8_filter_mb_row;
    }

    /* does not change for VP8 */
    memcpy(s->prob[0].scan, ff_zigzag_scan, sizeof(s->prob[0].scan));

    if ((ret = vp8_init_frames(s)) < 0) {
        ff_vp8_decode_free(avctx);
        return ret;
    }

    return 0;
}

Project: FFmpeg
File: vp8.c

int vp78_decode_mb_row_sliced(AVCodecContext *avctx, void *tdata, int jobnr,
                              int threadnr, int is_vp7)
{
    VP8Context *s = avctx->priv_data;
    VP8ThreadData *td = &s->thread_data[jobnr];
    VP8ThreadData *next_td = NULL, *prev_td = NULL;
    VP8Frame *curframe = s->curframe;
    int mb_y, num_jobs = s->num_jobs;
    int ret;

    td->thread_nr = threadnr;
    td->mv_bounds.mv_min.y   = -MARGIN - 64 * threadnr;
    td->mv_bounds.mv_max.y   = ((s->mb_height - 1) << 6) + MARGIN - 64 * threadnr;
    for (mb_y = jobnr; mb_y < s->mb_height; mb_y += num_jobs) {
        atomic_store(&td->thread_mb_pos, mb_y << 16);
        ret = s->decode_mb_row_no_filter(avctx, tdata, jobnr, threadnr);
        if (ret < 0) {
            update_pos(td, s->mb_height, INT_MAX & 0xFFFF);
            return ret;
        }
        if (s->deblock_filter)
            s->filter_mb_row(avctx, tdata, jobnr, threadnr);
        update_pos(td, mb_y, INT_MAX & 0xFFFF);

        td->mv_bounds.mv_min.y -= 64 * num_jobs;
        td->mv_bounds.mv_max.y -= 64 * num_jobs;

        if (avctx->active_thread_type == FF_THREAD_FRAME)
            ff_thread_report_progress(&curframe->tf, mb_y, 0);
    }

    return 0;
}

Project: FFmpeg
File: vp8.c

void vp78_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
                                    VP8Frame *prev_frame, int is_vp7)
{
    VP8Context *s = avctx->priv_data;
    int mb_x, mb_y;

    s->mv_bounds.mv_min.y = -MARGIN;
    s->mv_bounds.mv_max.y = ((s->mb_height - 1) << 6) + MARGIN;
    for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
        VP8Macroblock *mb = s->macroblocks_base +
                            ((s->mb_width + 1) * (mb_y + 1) + 1);
        int mb_xy = mb_y * s->mb_width;

        AV_WN32A(s->intra4x4_pred_mode_left, DC_PRED * 0x01010101);

        s->mv_bounds.mv_min.x = -MARGIN;
        s->mv_bounds.mv_max.x = ((s->mb_width - 1) << 6) + MARGIN;
        for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb_xy++, mb++) {
            if (mb_y == 0)
                AV_WN32A((mb - s->mb_width - 1)->intra4x4_pred_mode_top,
                         DC_PRED * 0x01010101);
            decode_mb_mode(s, &s->mv_bounds, mb, mb_x, mb_y, curframe->seg_map->data + mb_xy,
                           prev_frame && prev_frame->seg_map ?
                           prev_frame->seg_map->data + mb_xy : NULL, 1, is_vp7);
            s->mv_bounds.mv_min.x -= 64;
            s->mv_bounds.mv_max.x -= 64;
        }
        s->mv_bounds.mv_min.y -= 64;
        s->mv_bounds.mv_max.y -= 64;
    }
}

Project: FFmpeg
File: vp8.c

static void vp78_reset_probability_tables(VP8Context *s)
{
    int i, j;
    for (i = 0; i < 4; i++)
        for (j = 0; j < 16; j++)
            memcpy(s->prob->token[i][j], vp8_token_default_probs[i][vp8_coeff_band[j]],
                   sizeof(s->prob->token[i][j]));
}

Project: FFmpeg
File: vp8.c

static void vp78_update_probability_tables(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;
    int i, j, k, l, m;

    for (i = 0; i < 4; i++)
        for (j = 0; j < 8; j++)
            for (k = 0; k < 3; k++)
                for (l = 0; l < NUM_DCT_TOKENS-1; l++)
                    if (vp56_rac_get_prob_branchy(c, vp8_token_update_probs[i][j][k][l])) {
                        int prob = vp8_rac_get_uint(c, 8);
                        for (m = 0; vp8_coeff_band_indexes[j][m] >= 0; m++)
                            s->prob->token[i][vp8_coeff_band_indexes[j][m]][k][l] = prob;
                    }
}

Project: FFmpeg
File: vp8.c

static int vp7_decode_block_coeffs_internal(VP56RangeCoder *r,
                                            int16_t block[16],
                                            uint8_t probs[16][3][NUM_DCT_TOKENS - 1],
                                            int i, uint8_t *token_prob,
                                            int16_t qmul[2],
                                            const uint8_t scan[16])
{
    return decode_block_coeffs_internal(r, block, probs, i,
                                        token_prob, qmul, scan, IS_VP7);
}

Project: FFmpeg
File: vp8.c

static int vp7_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                            AVPacket *avpkt)
{
    return vp78_decode_frame(avctx, data, got_frame, avpkt, IS_VP7);
}

Project: FFmpeg
File: vp8.c

static int vp7_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
{
    VP56RangeCoder *c = &s->c;
    int part1_size, hscale, vscale, i, j, ret;
    int width  = s->avctx->width;
    int height = s->avctx->height;

    if (buf_size < 4) {
        return AVERROR_INVALIDDATA;
    }

    s->profile = (buf[0] >> 1) & 7;
    if (s->profile > 1) {
        avpriv_request_sample(s->avctx, "Unknown profile %d", s->profile);
        return AVERROR_INVALIDDATA;
    }

    s->keyframe  = !(buf[0] & 1);
    s->invisible = 0;
    part1_size   = AV_RL24(buf) >> 4;

    if (buf_size < 4 - s->profile + part1_size) {
        av_log(s->avctx, AV_LOG_ERROR, "Buffer size %d is too small, needed : %d\n", buf_size, 4 - s->profile + part1_size);
        return AVERROR_INVALIDDATA;
    }

    buf      += 4 - s->profile;
    buf_size -= 4 - s->profile;

    memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab, sizeof(s->put_pixels_tab));

    ret = ff_vp56_init_range_decoder(c, buf, part1_size);
    if (ret < 0)
        return ret;
    buf      += part1_size;
    buf_size -= part1_size;

    /* A. Dimension information (keyframes only) */
    if (s->keyframe) {
        width  = vp8_rac_get_uint(c, 12);
        height = vp8_rac_get_uint(c, 12);
        hscale = vp8_rac_get_uint(c, 2);
        vscale = vp8_rac_get_uint(c, 2);
        if (hscale || vscale)
            avpriv_request_sample(s->avctx, "Upscaling");

        s->update_golden = s->update_altref = VP56_FRAME_CURRENT;
        vp78_reset_probability_tables(s);
        memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter,
               sizeof(s->prob->pred16x16));
        memcpy(s->prob->pred8x8c, vp8_pred8x8c_prob_inter,
               sizeof(s->prob->pred8x8c));
        for (i = 0; i < 2; i++)
            memcpy(s->prob->mvc[i], vp7_mv_default_prob[i],
                   sizeof(vp7_mv_default_prob[i]));
        memset(&s->segmentation, 0, sizeof(s->segmentation));
        memset(&s->lf_delta, 0, sizeof(s->lf_delta));
        memcpy(s->prob[0].scan, ff_zigzag_scan, sizeof(s->prob[0].scan));
    }

    if (s->keyframe || s->profile > 0)
        memset(s->inter_dc_pred, 0 , sizeof(s->inter_dc_pred));

    /* B. Decoding information for all four macroblock-level features */
    for (i = 0; i < 4; i++) {
        s->feature_enabled[i] = vp8_rac_get(c);
        if (s->feature_enabled[i]) {
             s->feature_present_prob[i] = vp8_rac_get_uint(c, 8);

             for (j = 0; j < 3; j++)
                 s->feature_index_prob[i][j] =
                     vp8_rac_get(c) ? vp8_rac_get_uint(c, 8) : 255;

             if (vp7_feature_value_size[s->profile][i])
                 for (j = 0; j < 4; j++)
                     s->feature_value[i][j] =
                        vp8_rac_get(c) ? vp8_rac_get_uint(c, vp7_feature_value_size[s->profile][i]) : 0;
        }
    }

    s->segmentation.enabled    = 0;
    s->segmentation.update_map = 0;
    s->lf_delta.enabled        = 0;

    s->num_coeff_partitions = 1;
    ret = ff_vp56_init_range_decoder(&s->coeff_partition[0], buf, buf_size);
    if (ret < 0)
        return ret;

    if (!s->macroblocks_base || /* first frame */
        width != s->avctx->width || height != s->avctx->height ||
        (width + 15) / 16 != s->mb_width || (height + 15) / 16 != s->mb_height) {
        if ((ret = vp7_update_dimensions(s, width, height)) < 0)
            return ret;
    }

    /* C. Dequantization indices */
    vp7_get_quants(s);

    /* D. Golden frame update flag (a Flag) for interframes only */
    if (!s->keyframe) {
        s->update_golden = vp8_rac_get(c) ? VP56_FRAME_CURRENT : VP56_FRAME_NONE;
        s->sign_bias[VP56_FRAME_GOLDEN] = 0;
    }

    s->update_last          = 1;
    s->update_probabilities = 1;
    s->fade_present         = 1;

    if (s->profile > 0) {
        s->update_probabilities = vp8_rac_get(c);
        if (!s->update_probabilities)
            s->prob[1] = s->prob[0];

        if (!s->keyframe)
            s->fade_present = vp8_rac_get(c);
    }

    /* E. Fading information for previous frame */
    if (s->fade_present && vp8_rac_get(c)) {
        if ((ret = vp7_fade_frame(s ,c)) < 0)
            return ret;
    }

    /* F. Loop filter type */
    if (!s->profile)
        s->filter.simple = vp8_rac_get(c);

    /* G. DCT coefficient ordering specification */
    if (vp8_rac_get(c))
        for (i = 1; i < 16; i++)
            s->prob[0].scan[i] = ff_zigzag_scan[vp8_rac_get_uint(c, 4)];

    /* H. Loop filter levels  */
    if (s->profile > 0)
        s->filter.simple = vp8_rac_get(c);
    s->filter.level     = vp8_rac_get_uint(c, 6);
    s->filter.sharpness = vp8_rac_get_uint(c, 3);

    /* I. DCT coefficient probability update; 13.3 Token Probability Updates */
    vp78_update_probability_tables(s);

    s->mbskip_enabled = 0;

    /* J. The remaining frame header data occurs ONLY FOR INTERFRAMES */
    if (!s->keyframe) {
        s->prob->intra  = vp8_rac_get_uint(c, 8);
        s->prob->last   = vp8_rac_get_uint(c, 8);
        vp78_update_pred16x16_pred8x8_mvc_probabilities(s, VP7_MVC_SIZE);
    }

    return 0;
}

Project: FFmpeg
File: vp8.c

static int vp7_decode_init(AVCodecContext *avctx)
{
    return vp78_decode_init(avctx, IS_VP7);
}

Project: FFmpeg
File: vp8.c

static int vp7_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
                                        int jobnr, int threadnr)
{
    return decode_mb_row_no_filter(avctx, tdata, jobnr, threadnr, 1);
}

Project: FFmpeg
File: vp8.c

static int vp7_decode_mb_row_sliced(AVCodecContext *avctx, void *tdata,
                                    int jobnr, int threadnr)
{
    return vp78_decode_mb_row_sliced(avctx, tdata, jobnr, threadnr, IS_VP7);
}

Project: FFmpeg
File: vp8.c

static void vp7_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
                                   VP8Frame *prev_frame)
{
    vp78_decode_mv_mb_modes(avctx, cur_frame, prev_frame, IS_VP7);
}

Project: FFmpeg
File: vp8.c

void vp7_decode_mvs(VP8Context *s, VP8Macroblock *mb,
                    int mb_x, int mb_y, int layout)
{
    VP8Macroblock *mb_edge[12];
    enum { CNT_ZERO, CNT_NEAREST, CNT_NEAR };
    enum { VP8_EDGE_TOP, VP8_EDGE_LEFT, VP8_EDGE_TOPLEFT };
    int idx = CNT_ZERO;
    VP56mv near_mv[3];
    uint8_t cnt[3] = { 0 };
    VP56RangeCoder *c = &s->c;
    int i;

    AV_ZERO32(&near_mv[0]);
    AV_ZERO32(&near_mv[1]);
    AV_ZERO32(&near_mv[2]);

    for (i = 0; i < VP7_MV_PRED_COUNT; i++) {
        const VP7MVPred * pred = &vp7_mv_pred[i];
        int edge_x, edge_y;

        if (vp7_calculate_mb_offset(mb_x, mb_y, s->mb_width, pred->xoffset,
                                    pred->yoffset, !s->profile, &edge_x, &edge_y)) {
            VP8Macroblock *edge = mb_edge[i] = (s->mb_layout == 1)
                                             ? s->macroblocks_base + 1 + edge_x +
                                               (s->mb_width + 1) * (edge_y + 1)
                                             : s->macroblocks + edge_x +
                                               (s->mb_height - edge_y - 1) * 2;
            uint32_t mv = AV_RN32A(get_bmv_ptr(edge, vp7_mv_pred[i].subblock));
            if (mv) {
                if (AV_RN32A(&near_mv[CNT_NEAREST])) {
                    if (mv == AV_RN32A(&near_mv[CNT_NEAREST])) {
                        idx = CNT_NEAREST;
                    } else if (AV_RN32A(&near_mv[CNT_NEAR])) {
                        if (mv != AV_RN32A(&near_mv[CNT_NEAR]))
                            continue;
                        idx = CNT_NEAR;
                    } else {
                        AV_WN32A(&near_mv[CNT_NEAR], mv);
                        idx = CNT_NEAR;
                    }
                } else {
                    AV_WN32A(&near_mv[CNT_NEAREST], mv);
                    idx = CNT_NEAREST;
                }
            } else {
                idx = CNT_ZERO;
            }
        } else {
            idx = CNT_ZERO;
        }
        cnt[idx] += vp7_mv_pred[i].score;
    }

    mb->partitioning = VP8_SPLITMVMODE_NONE;

    if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_ZERO]][0])) {
        mb->mode = VP8_MVMODE_MV;

        if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_NEAREST]][1])) {

            if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_NEAR]][2])) {

                if (cnt[CNT_NEAREST] > cnt[CNT_NEAR])
                    AV_WN32A(&mb->mv, cnt[CNT_ZERO] > cnt[CNT_NEAREST] ? 0 : AV_RN32A(&near_mv[CNT_NEAREST]));
                else
                    AV_WN32A(&mb->mv, cnt[CNT_ZERO] > cnt[CNT_NEAR]    ? 0 : AV_RN32A(&near_mv[CNT_NEAR]));

                if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_NEAR]][3])) {
                    mb->mode = VP8_MVMODE_SPLIT;
                    mb->mv = mb->bmv[decode_splitmvs(s, c, mb, layout, IS_VP7) - 1];
                } else {
                    mb->mv.y += vp7_read_mv_component(c, s->prob->mvc[0]);
                    mb->mv.x += vp7_read_mv_component(c, s->prob->mvc[1]);
                    mb->bmv[0] = mb->mv;
                }
            } else {
                mb->mv = near_mv[CNT_NEAR];
                mb->bmv[0] = mb->mv;
            }
        } else {
            mb->mv = near_mv[CNT_NEAREST];
            mb->bmv[0] = mb->mv;
        }
    } else {
        mb->mode = VP8_MVMODE_ZERO;
        AV_ZERO32(&mb->mv);
        mb->bmv[0] = mb->mv;
    }
}

Project: FFmpeg
File: vp8.c

static void vp7_get_quants(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;

    int yac_qi  = vp8_rac_get_uint(c, 7);
    int ydc_qi  = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int y2dc_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int y2ac_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int uvdc_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int uvac_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;

    s->qmat[0].luma_qmul[0]    =       vp7_ydc_qlookup[ydc_qi];
    s->qmat[0].luma_qmul[1]    =       vp7_yac_qlookup[yac_qi];
    s->qmat[0].luma_dc_qmul[0] =       vp7_y2dc_qlookup[y2dc_qi];
    s->qmat[0].luma_dc_qmul[1] =       vp7_y2ac_qlookup[y2ac_qi];
    s->qmat[0].chroma_qmul[0]  = FFMIN(vp7_ydc_qlookup[uvdc_qi], 132);
    s->qmat[0].chroma_qmul[1]  =       vp7_yac_qlookup[uvac_qi];
}

Project: FFmpeg
File: vp8.c

static int vp7_read_mv_component(VP56RangeCoder *c, const uint8_t *p)
{
    return read_mv_component(c, p, 1);
}

Project: FFmpeg
File: vp8.c

static int vp7_update_dimensions(VP8Context *s, int width, int height)
{
    return update_dimensions(s, width, height, IS_VP7);
}

Project: FFmpeg
File: vp8.c

static int vp8_alloc_frame(VP8Context *s, VP8Frame *f, int ref)
{
    int ret;
    if ((ret = ff_thread_get_buffer(s->avctx, &f->tf,
                                    ref ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
        return ret;
    if (!(f->seg_map = av_buffer_allocz(s->mb_width * s->mb_height))) {
        ff_thread_release_buffer(s->avctx, &f->tf);
        return AVERROR(ENOMEM);
    }
    return 0;
}

Project: FFmpeg
File: vp8.c

static void vp8_decode_flush(AVCodecContext *avctx)
{
    vp8_decode_flush_impl(avctx, 0);
}

Project: FFmpeg

static int vp8_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
{
    VP56RangeCoder *c = &s->c;
    int header_size, hscale, vscale, ret;
    int width  = s->avctx->width;
    int height = s->avctx->height;

    if (buf_size < 3) {
        av_log(s->avctx, AV_LOG_ERROR, "Insufficent data (%d) for header\n", buf_size);
        return AVERROR_INVALIDDATA;
    }

    s->keyframe  = !(buf[0] & 1);
    s->profile   =  (buf[0]>>1) & 7;
    s->invisible = !(buf[0] & 0x10);
    header_size  = AV_RL24(buf) >> 5;
    buf      += 3;
    buf_size -= 3;

    if (s->profile > 3)
        av_log(s->avctx, AV_LOG_WARNING, "Unknown profile %d\n", s->profile);

    if (!s->profile)
        memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab,
               sizeof(s->put_pixels_tab));
    else    // profile 1-3 use bilinear, 4+ aren't defined so whatever
        memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_bilinear_pixels_tab,
               sizeof(s->put_pixels_tab));

    if (header_size > buf_size - 7 * s->keyframe) {
        av_log(s->avctx, AV_LOG_ERROR, "Header size larger than data provided\n");
        return AVERROR_INVALIDDATA;
    }

    if (s->keyframe) {
        if (AV_RL24(buf) != 0x2a019d) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Invalid start code 0x%x\n", AV_RL24(buf));
            return AVERROR_INVALIDDATA;
        }
        width     = AV_RL16(buf + 3) & 0x3fff;
        height    = AV_RL16(buf + 5) & 0x3fff;
        hscale    = buf[4] >> 6;
        vscale    = buf[6] >> 6;
        buf      += 7;
        buf_size -= 7;

        if (hscale || vscale)
            avpriv_request_sample(s->avctx, "Upscaling");

        s->update_golden = s->update_altref = VP56_FRAME_CURRENT;
        vp78_reset_probability_tables(s);
        memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter,
               sizeof(s->prob->pred16x16));
        memcpy(s->prob->pred8x8c, vp8_pred8x8c_prob_inter,
               sizeof(s->prob->pred8x8c));
        memcpy(s->prob->mvc, vp8_mv_default_prob,
               sizeof(s->prob->mvc));
        memset(&s->segmentation, 0, sizeof(s->segmentation));
        memset(&s->lf_delta, 0, sizeof(s->lf_delta));
    }

    ret = ff_vp56_init_range_decoder(c, buf, header_size);
    if (ret < 0)
        return ret;
    buf      += header_size;
    buf_size -= header_size;

    if (s->keyframe) {
        s->colorspace = vp8_rac_get(c);
        if (s->colorspace)
            av_log(s->avctx, AV_LOG_WARNING, "Unspecified colorspace\n");
        s->fullrange = vp8_rac_get(c);
    }

    if ((s->segmentation.enabled = vp8_rac_get(c)))
        parse_segment_info(s);
    else
        s->segmentation.update_map = 0; // FIXME: move this to some init function?

    s->filter.simple    = vp8_rac_get(c);
    s->filter.level     = vp8_rac_get_uint(c, 6);
    s->filter.sharpness = vp8_rac_get_uint(c, 3);

    if ((s->lf_delta.enabled = vp8_rac_get(c)))
        if (vp8_rac_get(c))
            update_lf_deltas(s);

    if (setup_partitions(s, buf, buf_size)) {
        av_log(s->avctx, AV_LOG_ERROR, "Invalid partitions\n");
        return AVERROR_INVALIDDATA;
    }

    if (!s->macroblocks_base || /* first frame */
        width != s->avctx->width || height != s->avctx->height ||
        (width+15)/16 != s->mb_width || (height+15)/16 != s->mb_height)
        if ((ret = vp8_update_dimensions(s, width, height)) < 0)
            return ret;

    vp8_get_quants(s);

    if (!s->keyframe) {
        update_refs(s);
        s->sign_bias[VP56_FRAME_GOLDEN]               = vp8_rac_get(c);
        s->sign_bias[VP56_FRAME_GOLDEN2 /* altref */] = vp8_rac_get(c);
    }

    if (!(s->update_probabilities = vp8_rac_get(c)))
        s->prob[1] = s->prob[0];

    s->update_last = s->keyframe || vp8_rac_get(c);

    vp78_update_probability_tables(s);

    if ((s->mbskip_enabled = vp8_rac_get(c)))
        s->prob->mbskip = vp8_rac_get_uint(c, 8);

    if (!s->keyframe) {
        s->prob->intra  = vp8_rac_get_uint(c, 8);
        s->prob->last   = vp8_rac_get_uint(c, 8);
        s->prob->golden = vp8_rac_get_uint(c, 8);
        vp78_update_pred16x16_pred8x8_mvc_probabilities(s, VP8_MVC_SIZE);
    }

    return 0;
}

Project: FFmpeg
File: vp8.c

static av_cold int vp8_decode_init_thread_copy(AVCodecContext *avctx)
{
    VP8Context *s = avctx->priv_data;
    int ret;

    s->avctx = avctx;

    if ((ret = vp8_init_frames(s)) < 0) {
        ff_vp8_decode_free(avctx);
        return ret;
    }

    return 0;
}

Project: FFmpeg
File: vp8.c

static int vp8_decode_mb_row_sliced(AVCodecContext *avctx, void *tdata,
                                    int jobnr, int threadnr)
{
    return vp78_decode_mb_row_sliced(avctx, tdata, jobnr, threadnr, IS_VP8);
}

Project: FFmpeg
File: vp8.c

static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
                                   VP8Frame *prev_frame)
{
    vp78_decode_mv_mb_modes(avctx, cur_frame, prev_frame, IS_VP8);
}

Project: FFmpeg
File: vp8.c

void vp8_decode_mvs(VP8Context *s, VP8mvbounds *mv_bounds, VP8Macroblock *mb,
                    int mb_x, int mb_y, int layout)
{
    VP8Macroblock *mb_edge[3] = { 0      /* top */,
                                  mb - 1 /* left */,
                                  0      /* top-left */ };
    enum { CNT_ZERO, CNT_NEAREST, CNT_NEAR, CNT_SPLITMV };
    enum { VP8_EDGE_TOP, VP8_EDGE_LEFT, VP8_EDGE_TOPLEFT };
    int idx = CNT_ZERO;
    int cur_sign_bias = s->sign_bias[mb->ref_frame];
    int8_t *sign_bias = s->sign_bias;
    VP56mv near_mv[4];
    uint8_t cnt[4] = { 0 };
    VP56RangeCoder *c = &s->c;

    if (!layout) { // layout is inlined (s->mb_layout is not)
        mb_edge[0] = mb + 2;
        mb_edge[2] = mb + 1;
    } else {
        mb_edge[0] = mb - s->mb_width - 1;
        mb_edge[2] = mb - s->mb_width - 2;
    }

    AV_ZERO32(&near_mv[0]);
    AV_ZERO32(&near_mv[1]);
    AV_ZERO32(&near_mv[2]);

    /* Process MB on top, left and top-left */
#define MV_EDGE_CHECK(n)                                                      \
    {                                                                         \
        VP8Macroblock *edge = mb_edge[n];                                     \
        int edge_ref = edge->ref_frame;                                       \
        if (edge_ref != VP56_FRAME_CURRENT) {                                 \
            uint32_t mv = AV_RN32A(&edge->mv);                                \
            if (mv) {                                                         \
                if (cur_sign_bias != sign_bias[edge_ref]) {                   \
                    /* SWAR negate of the values in mv. */                    \
                    mv = ~mv;                                                 \
                    mv = ((mv & 0x7fff7fff) +                                 \
                          0x00010001) ^ (mv & 0x80008000);                    \
                }                                                             \
                if (!n || mv != AV_RN32A(&near_mv[idx]))                      \
                    AV_WN32A(&near_mv[++idx], mv);                            \
                cnt[idx] += 1 + (n != 2);                                     \
            } else                                                            \
                cnt[CNT_ZERO] += 1 + (n != 2);                                \
        }                                                                     \
    }

    MV_EDGE_CHECK(0)
    MV_EDGE_CHECK(1)
    MV_EDGE_CHECK(2)

    mb->partitioning = VP8_SPLITMVMODE_NONE;
    if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_ZERO]][0])) {
        mb->mode = VP8_MVMODE_MV;

        /* If we have three distinct MVs, merge first and last if they're the same */
        if (cnt[CNT_SPLITMV] &&
            AV_RN32A(&near_mv[1 + VP8_EDGE_TOP]) == AV_RN32A(&near_mv[1 + VP8_EDGE_TOPLEFT]))
            cnt[CNT_NEAREST] += 1;

        /* Swap near and nearest if necessary */
        if (cnt[CNT_NEAR] > cnt[CNT_NEAREST]) {
            FFSWAP(uint8_t,     cnt[CNT_NEAREST],     cnt[CNT_NEAR]);
            FFSWAP( VP56mv, near_mv[CNT_NEAREST], near_mv[CNT_NEAR]);
        }

        if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_NEAREST]][1])) {
            if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_NEAR]][2])) {
                /* Choose the best mv out of 0,0 and the nearest mv */
                clamp_mv(mv_bounds, &mb->mv, &near_mv[CNT_ZERO + (cnt[CNT_NEAREST] >= cnt[CNT_ZERO])]);
                cnt[CNT_SPLITMV] = ((mb_edge[VP8_EDGE_LEFT]->mode    == VP8_MVMODE_SPLIT) +
                                    (mb_edge[VP8_EDGE_TOP]->mode     == VP8_MVMODE_SPLIT)) * 2 +
                                    (mb_edge[VP8_EDGE_TOPLEFT]->mode == VP8_MVMODE_SPLIT);

                if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_SPLITMV]][3])) {
                    mb->mode = VP8_MVMODE_SPLIT;
                    mb->mv = mb->bmv[decode_splitmvs(s, c, mb, layout, IS_VP8) - 1];
                } else {
                    mb->mv.y  += vp8_read_mv_component(c, s->prob->mvc[0]);
                    mb->mv.x  += vp8_read_mv_component(c, s->prob->mvc[1]);
                    mb->bmv[0] = mb->mv;
                }
            } else {
                clamp_mv(mv_bounds, &mb->mv, &near_mv[CNT_NEAR]);
                mb->bmv[0] = mb->mv;
            }
        } else {
            clamp_mv(mv_bounds, &mb->mv, &near_mv[CNT_NEAREST]);
            mb->bmv[0] = mb->mv;
        }
    } else {
        mb->mode = VP8_MVMODE_ZERO;
        AV_ZERO32(&mb->mv);
        mb->bmv[0] = mb->mv;
    }
}

Project: FFmpeg
File: vp8.c

static int vp8_decode_update_thread_context(AVCodecContext *dst,
                                            const AVCodecContext *src)
{
    VP8Context *s = dst->priv_data, *s_src = src->priv_data;
    int i;

    if (s->macroblocks_base &&
        (s_src->mb_width != s->mb_width || s_src->mb_height != s->mb_height)) {
        free_buffers(s);
        s->mb_width  = s_src->mb_width;
        s->mb_height = s_src->mb_height;
    }

    s->prob[0]      = s_src->prob[!s_src->update_probabilities];
    s->segmentation = s_src->segmentation;
    s->lf_delta     = s_src->lf_delta;
    memcpy(s->sign_bias, s_src->sign_bias, sizeof(s->sign_bias));

    for (i = 0; i < FF_ARRAY_ELEMS(s_src->frames); i++) {
        if (s_src->frames[i].tf.f->data[0]) {
            int ret = vp8_ref_frame(s, &s->frames[i], &s_src->frames[i]);
            if (ret < 0)
                return ret;
        }
    }

    s->framep[0] = REBASE(s_src->next_framep[0]);
    s->framep[1] = REBASE(s_src->next_framep[1]);
    s->framep[2] = REBASE(s_src->next_framep[2]);
    s->framep[3] = REBASE(s_src->next_framep[3]);

    return 0;
}

Project: FFmpeg
File: vp8.c

static void vp8_filter_mb_row(AVCodecContext *avctx, void *tdata,
                              int jobnr, int threadnr)
{
    filter_mb_row(avctx, tdata, jobnr, threadnr, 0);
}

Project: FFmpeg

static VP8Frame *vp8_find_free_buffer(VP8Context *s)
{
    VP8Frame *frame = NULL;
    int i;

    for (i = 0; i < 5; i++)
        if (&s->frames[i] != s->framep[VP56_FRAME_CURRENT]  &&
            &s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&
            &s->frames[i] != s->framep[VP56_FRAME_GOLDEN]   &&
            &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2]) {
            frame = &s->frames[i];
            break;
        }
    if (i == 5) {
        av_log(s->avctx, AV_LOG_FATAL, "Ran out of free frames!\n");
        abort();
    }
    if (frame->tf.f->data[0])
        vp8_release_frame(s, frame);

    return frame;
}

Project: FFmpeg
File: vp8.c

static void vp8_get_quants(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;
    int i, base_qi;

    int yac_qi     = vp8_rac_get_uint(c, 7);
    int ydc_delta  = vp8_rac_get_sint(c, 4);
    int y2dc_delta = vp8_rac_get_sint(c, 4);
    int y2ac_delta = vp8_rac_get_sint(c, 4);
    int uvdc_delta = vp8_rac_get_sint(c, 4);
    int uvac_delta = vp8_rac_get_sint(c, 4);

    for (i = 0; i < 4; i++) {
        if (s->segmentation.enabled) {
            base_qi = s->segmentation.base_quant[i];
            if (!s->segmentation.absolute_vals)
                base_qi += yac_qi;
        } else
            base_qi = yac_qi;

        s->qmat[i].luma_qmul[0]    = vp8_dc_qlookup[av_clip_uintp2(base_qi + ydc_delta,  7)];
        s->qmat[i].luma_qmul[1]    = vp8_ac_qlookup[av_clip_uintp2(base_qi,              7)];
        s->qmat[i].luma_dc_qmul[0] = vp8_dc_qlookup[av_clip_uintp2(base_qi + y2dc_delta, 7)] * 2;
        /* 101581>>16 is equivalent to 155/100 */
        s->qmat[i].luma_dc_qmul[1] = vp8_ac_qlookup[av_clip_uintp2(base_qi + y2ac_delta, 7)] * 101581 >> 16;
        s->qmat[i].chroma_qmul[0]  = vp8_dc_qlookup[av_clip_uintp2(base_qi + uvdc_delta, 7)];
        s->qmat[i].chroma_qmul[1]  = vp8_ac_qlookup[av_clip_uintp2(base_qi + uvac_delta, 7)];

        s->qmat[i].luma_dc_qmul[1] = FFMAX(s->qmat[i].luma_dc_qmul[1], 8);
        s->qmat[i].chroma_qmul[0]  = FFMIN(s->qmat[i].chroma_qmul[0], 132);
    }
}

Project: FFmpeg

void vp8_mc_luma(VP8Context *s, VP8ThreadData *td, uint8_t *dst,
                 ThreadFrame *ref, const VP56mv *mv,
                 int x_off, int y_off, int block_w, int block_h,
                 int width, int height, ptrdiff_t linesize,
                 vp8_mc_func mc_func[3][3])
{
    uint8_t *src = ref->f->data[0];

    if (AV_RN32A(mv)) {
        ptrdiff_t src_linesize = linesize;

        int mx = (mv->x * 2) & 7, mx_idx = subpel_idx[0][mx];
        int my = (mv->y * 2) & 7, my_idx = subpel_idx[0][my];

        x_off += mv->x >> 2;
        y_off += mv->y >> 2;

        ff_thread_await_progress(ref, (3 + y_off + block_h + subpel_idx[2][my]) >> 4, 0);
        src += y_off * linesize + x_off;
        if (x_off < mx_idx || x_off >= width  - block_w - subpel_idx[2][mx] ||
            y_off < my_idx || y_off >= height - block_h - subpel_idx[2][my]) {
            s->vdsp.emulated_edge_mc(td->edge_emu_buffer,
                                     src - my_idx * linesize - mx_idx,
                                     EDGE_EMU_LINESIZE, linesize,
                                     block_w + subpel_idx[1][mx],
                                     block_h + subpel_idx[1][my],
                                     x_off - mx_idx, y_off - my_idx,
                                     width, height);
            src = td->edge_emu_buffer + mx_idx + EDGE_EMU_LINESIZE * my_idx;
            src_linesize = EDGE_EMU_LINESIZE;
        }
        mc_func[my_idx][mx_idx](dst, linesize, src, src_linesize, block_h, mx, my);
    } else {
        ff_thread_await_progress(ref, (3 + y_off + block_h) >> 4, 0);
        mc_func[0][0](dst, linesize, src + y_off * linesize + x_off,
                      linesize, block_h, 0, 0);
    }
}

Project: FFmpeg
File: vp8.c

static int vp8_read_mv_component(VP56RangeCoder *c, const uint8_t *p)
{
    return read_mv_component(c, p, 0);
}

Project: FFmpeg
File: vp8.c

static int vp8_ref_frame(VP8Context *s, VP8Frame *dst, VP8Frame *src)
{
    int ret;

    vp8_release_frame(s, dst);

    if ((ret = ff_thread_ref_frame(&dst->tf, &src->tf)) < 0)
        return ret;
    if (src->seg_map &&
        !(dst->seg_map = av_buffer_ref(src->seg_map))) {
        vp8_release_frame(s, dst);
        return AVERROR(ENOMEM);
    }

    return 0;
}

Project: FFmpeg
File: vp8.c

static void vp8_release_frame(VP8Context *s, VP8Frame *f)
{
    av_buffer_unref(&f->seg_map);
    ff_thread_release_buffer(s->avctx, &f->tf);
}

Project: FFmpeg
File: vp8.c

static int vp8_update_dimensions(VP8Context *s, int width, int height)
{
    return update_dimensions(s, width, height, IS_VP8);
}

Project: FFmpeg

void xchg_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb,
                    uint8_t *src_cr, ptrdiff_t linesize, ptrdiff_t uvlinesize, int mb_x,
                    int mb_y, int mb_width, int simple, int xchg)
{
    uint8_t *top_border_m1 = top_border - 32;     // for TL prediction
    src_y  -= linesize;
    src_cb -= uvlinesize;
    src_cr -= uvlinesize;

#define XCHG(a, b, xchg)                                                      \
    do {                                                                      \
        if (xchg)                                                             \
            AV_SWAP64(b, a);                                                  \
        else                                                                  \
            AV_COPY64(b, a);                                                  \
    } while (0)

    XCHG(top_border_m1 + 8, src_y - 8, xchg);
    XCHG(top_border, src_y, xchg);
    XCHG(top_border + 8, src_y + 8, 1);
    if (mb_x < mb_width - 1)
        XCHG(top_border + 32, src_y + 16, 1);

    if (!simple || !mb_y) {
        XCHG(top_border_m1 + 16, src_cb - 8, xchg);
        XCHG(top_border_m1 + 24, src_cr - 8, xchg);
        XCHG(top_border + 16, src_cb, 1);
        XCHG(top_border + 24, src_cr, 1);
    }
}

Project: FFmpeg
File: webp.c

static void alpha_inverse_prediction(AVFrame *frame, enum AlphaFilter m)
{
    int x, y, ls;
    uint8_t *dec;

    ls = frame->linesize[3];

    /* filter first row using horizontal filter */
    dec = frame->data[3] + 1;
    for (x = 1; x < frame->width; x++, dec++)
        *dec += *(dec - 1);

    /* filter first column using vertical filter */
    dec = frame->data[3] + ls;
    for (y = 1; y < frame->height; y++, dec += ls)
        *dec += *(dec - ls);

    /* filter the rest using the specified filter */
    switch (m) {
    case ALPHA_FILTER_HORIZONTAL:
        for (y = 1; y < frame->height; y++) {
            dec = frame->data[3] + y * ls + 1;
            for (x = 1; x < frame->width; x++, dec++)
                *dec += *(dec - 1);
        }
        break;
    case ALPHA_FILTER_VERTICAL:
        for (y = 1; y < frame->height; y++) {
            dec = frame->data[3] + y * ls + 1;
            for (x = 1; x < frame->width; x++, dec++)
                *dec += *(dec - ls);
        }
        break;
    case ALPHA_FILTER_GRADIENT:
        for (y = 1; y < frame->height; y++) {
            dec = frame->data[3] + y * ls + 1;
            for (x = 1; x < frame->width; x++, dec++)
                dec[0] += av_clip_uint8(*(dec - 1) + *(dec - ls) - *(dec - ls - 1));
        }
        break;
    }
}

Project: FFmpeg

static int apply_color_indexing_transform(WebPContext *s)
{
    ImageContext *img;
    ImageContext *pal;
    int i, x, y;
    uint8_t *p;

    img = &s->image[IMAGE_ROLE_ARGB];
    pal = &s->image[IMAGE_ROLE_COLOR_INDEXING];

    if (pal->size_reduction > 0) {
        GetBitContext gb_g;
        uint8_t *line;
        int pixel_bits = 8 >> pal->size_reduction;

        line = av_malloc(img->frame->linesize[0]);
        if (!line)
            return AVERROR(ENOMEM);

        for (y = 0; y < img->frame->height; y++) {
            p = GET_PIXEL(img->frame, 0, y);
            memcpy(line, p, img->frame->linesize[0]);
            init_get_bits(&gb_g, line, img->frame->linesize[0] * 8);
            skip_bits(&gb_g, 16);
            i = 0;
            for (x = 0; x < img->frame->width; x++) {
                p    = GET_PIXEL(img->frame, x, y);
                p[2] = get_bits(&gb_g, pixel_bits);
                i++;
                if (i == 1 << pal->size_reduction) {
                    skip_bits(&gb_g, 24);
                    i = 0;
                }
            }
        }
        av_free(line);
    }

    if (img->frame->height * img->frame->width > 300) {
        uint8_t palette[256 * 4];
        const int size = pal->frame->width * 4;
        av_assert0(size <= 1024U);
        memcpy(palette, GET_PIXEL(pal->frame, 0, 0), size);   // copy palette
        memset(palette + size, 0, 256 * 4 - size);
        for (y = 0; y < img->frame->height; y++) {
            for (x = 0; x < img->frame->width; x++) {
                p = GET_PIXEL(img->frame, x, y);
                i = p[2];
                AV_COPY32(p, &palette[i * 4]);
            }
        }
    } else {
        for (y = 0; y < img->frame->height; y++) {
            for (x = 0; x < img->frame->width; x++) {
                p = GET_PIXEL(img->frame, x, y);
                i = p[2];
                if (i >= pal->frame->width) {
                    AV_WB32(p, 0x00000000);
                } else {
                    const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
                    AV_COPY32(p, pi);
                }
            }
        }
    }

    return 0;
}

Project: FFmpeg
File: webp.c

static int apply_color_transform(WebPContext *s)
{
    ImageContext *img, *cimg;
    int x, y, cx, cy;
    uint8_t *p, *cp;

    img  = &s->image[IMAGE_ROLE_ARGB];
    cimg = &s->image[IMAGE_ROLE_COLOR_TRANSFORM];

    for (y = 0; y < img->frame->height; y++) {
        for (x = 0; x < img->frame->width; x++) {
            cx = x >> cimg->size_reduction;
            cy = y >> cimg->size_reduction;
            cp = GET_PIXEL(cimg->frame, cx, cy);
            p  = GET_PIXEL(img->frame,   x,  y);

            p[1] += color_transform_delta(cp[3], p[2]);
            p[3] += color_transform_delta(cp[2], p[2]) +
                    color_transform_delta(cp[1], p[1]);
        }
    }
    return 0;
}

Project: FFmpeg
File: webp.c

static int apply_subtract_green_transform(WebPContext *s)
{
    int x, y;
    ImageContext *img = &s->image[IMAGE_ROLE_ARGB];

    for (y = 0; y < img->frame->height; y++) {
        for (x = 0; x < img->frame->width; x++) {
            uint8_t *p = GET_PIXEL(img->frame, x, y);
            p[1] += p[2];
            p[3] += p[2];
        }
    }
    return 0;
}

Project: FFmpeg
File: webp.c

static av_always_inline uint8_t clamp_add_subtract_half(int a, int b, int c)
{
    int d = a + b >> 1;
    return av_clip_uint8(d + (d - c) / 2);
}

Project: FFmpeg
File: webp.c

static av_always_inline void color_cache_put(ImageContext *img, uint32_t c)
{
    uint32_t cache_idx = (0x1E35A7BD * c) >> (32 - img->color_cache_bits);
    img->color_cache[cache_idx] = c;
}

Project: FFmpeg
File: webp.c

static av_always_inline uint8_t color_transform_delta(uint8_t color_pred,
                                                      uint8_t color)
{
    return (int)ff_u8_to_s8(color_pred) * ff_u8_to_s8(color) >> 5;
}

Project: FFmpeg
File: webp.c

static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
                                      int w, int h)
{
    ImageContext *img;
    HuffReader *hg;
    int i, j, ret, x, y, width;

    img       = &s->image[role];
    img->role = role;

    if (!img->frame) {
        img->frame = av_frame_alloc();
        if (!img->frame)
            return AVERROR(ENOMEM);
    }

    img->frame->format = AV_PIX_FMT_ARGB;
    img->frame->width  = w;
    img->frame->height = h;

    if (role == IMAGE_ROLE_ARGB && !img->is_alpha_primary) {
        ThreadFrame pt = { .f = img->frame };
        ret = ff_thread_get_buffer(s->avctx, &pt, 0);
    } else
        ret = av_frame_get_buffer(img->frame, 1);
    if (ret < 0)
        return ret;

    if (get_bits1(&s->gb)) {
        img->color_cache_bits = get_bits(&s->gb, 4);
        if (img->color_cache_bits < 1 || img->color_cache_bits > 11) {
            av_log(s->avctx, AV_LOG_ERROR, "invalid color cache bits: %d\n",
                   img->color_cache_bits);
            return AVERROR_INVALIDDATA;
        }
        img->color_cache = av_mallocz_array(1 << img->color_cache_bits,
                                            sizeof(*img->color_cache));
        if (!img->color_cache)
            return AVERROR(ENOMEM);
    } else {
        img->color_cache_bits = 0;
    }

    img->nb_huffman_groups = 1;
    if (role == IMAGE_ROLE_ARGB && get_bits1(&s->gb)) {
        ret = decode_entropy_image(s);
        if (ret < 0)
            return ret;
        img->nb_huffman_groups = s->nb_huffman_groups;
    }
    img->huffman_groups = av_mallocz_array(img->nb_huffman_groups *
                                           HUFFMAN_CODES_PER_META_CODE,
                                           sizeof(*img->huffman_groups));
    if (!img->huffman_groups)
        return AVERROR(ENOMEM);

    for (i = 0; i < img->nb_huffman_groups; i++) {
        hg = &img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE];
        for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++) {
            int alphabet_size = alphabet_sizes[j];
            if (!j && img->color_cache_bits > 0)
                alphabet_size += 1 << img->color_cache_bits;

            if (get_bits1(&s->gb)) {
                read_huffman_code_simple(s, &hg[j]);
            } else {
                ret = read_huffman_code_normal(s, &hg[j], alphabet_size);
                if (ret < 0)
                    return ret;
            }
        }
    }

    width = img->frame->width;
    if (role == IMAGE_ROLE_ARGB && s->reduced_width > 0)
        width = s->reduced_width;

    x = 0; y = 0;
    while (y < img->frame->height) {
        int v;

        hg = get_huffman_group(s, img, x, y);
        v = huff_reader_get_symbol(&hg[HUFF_IDX_GREEN], &s->gb);
        if (v < NUM_LITERAL_CODES) {
            /* literal pixel values */
            uint8_t *p = GET_PIXEL(img->frame, x, y);
            p[2] = v;
            p[1] = huff_reader_get_symbol(&hg[HUFF_IDX_RED],   &s->gb);
            p[3] = huff_reader_get_symbol(&hg[HUFF_IDX_BLUE],  &s->gb);
            p[0] = huff_reader_get_symbol(&hg[HUFF_IDX_ALPHA], &s->gb);
            if (img->color_cache_bits)
                color_cache_put(img, AV_RB32(p));
            x++;
            if (x == width) {
                x = 0;
                y++;
            }
        } else if (v < NUM_LITERAL_CODES + NUM_LENGTH_CODES) {
            /* LZ77 backwards mapping */
            int prefix_code, length, distance, ref_x, ref_y;

            /* parse length and distance */
            prefix_code = v - NUM_LITERAL_CODES;
            if (prefix_code < 4) {
                length = prefix_code + 1;
            } else {
                int extra_bits = (prefix_code - 2) >> 1;
                int offset     = 2 + (prefix_code & 1) << extra_bits;
                length = offset + get_bits(&s->gb, extra_bits) + 1;
            }
            prefix_code = huff_reader_get_symbol(&hg[HUFF_IDX_DIST], &s->gb);
            if (prefix_code > 39) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "distance prefix code too large: %d\n", prefix_code);
                return AVERROR_INVALIDDATA;
            }
            if (prefix_code < 4) {
                distance = prefix_code + 1;
            } else {
                int extra_bits = prefix_code - 2 >> 1;
                int offset     = 2 + (prefix_code & 1) << extra_bits;
                distance = offset + get_bits(&s->gb, extra_bits) + 1;
            }

            /* find reference location */
            if (distance <= NUM_SHORT_DISTANCES) {
                int xi = lz77_distance_offsets[distance - 1][0];
                int yi = lz77_distance_offsets[distance - 1][1];
                distance = FFMAX(1, xi + yi * width);
            } else {
                distance -= NUM_SHORT_DISTANCES;
            }
            ref_x = x;
            ref_y = y;
            if (distance <= x) {
                ref_x -= distance;
                distance = 0;
            } else {
                ref_x = 0;
                distance -= x;
            }
            while (distance >= width) {
                ref_y--;
                distance -= width;
            }
            if (distance > 0) {
                ref_x = width - distance;
                ref_y--;
            }
            ref_x = FFMAX(0, ref_x);
            ref_y = FFMAX(0, ref_y);

            /* copy pixels
             * source and dest regions can overlap and wrap lines, so just
             * copy per-pixel */
            for (i = 0; i < length; i++) {
                uint8_t *p_ref = GET_PIXEL(img->frame, ref_x, ref_y);
                uint8_t *p     = GET_PIXEL(img->frame,     x,     y);

                AV_COPY32(p, p_ref);
                if (img->color_cache_bits)
                    color_cache_put(img, AV_RB32(p));
                x++;
                ref_x++;
                if (x == width) {
                    x = 0;
                    y++;
                }
                if (ref_x == width) {
                    ref_x = 0;
                    ref_y++;
                }
                if (y == img->frame->height || ref_y == img->frame->height)
                    break;
            }
        } else {
            /* read from color cache */
            uint8_t *p = GET_PIXEL(img->frame, x, y);
            int cache_idx = v - (NUM_LITERAL_CODES + NUM_LENGTH_CODES);

            if (!img->color_cache_bits) {
                av_log(s->avctx, AV_LOG_ERROR, "color cache not found\n");
                return AVERROR_INVALIDDATA;
            }
            if (cache_idx >= 1 << img->color_cache_bits) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "color cache index out-of-bounds\n");
                return AVERROR_INVALIDDATA;
            }
            AV_WB32(p, img->color_cache[cache_idx]);
            x++;
            if (x == width) {
                x = 0;
                y++;
            }
        }
    }

    return 0;
}

Project: FFmpeg
File: webp.c

static int decode_entropy_image(WebPContext *s)
{
    ImageContext *img;
    int ret, block_bits, width, blocks_w, blocks_h, x, y, max;

    width = s->width;
    if (s->reduced_width > 0)
        width = s->reduced_width;

    PARSE_BLOCK_SIZE(width, s->height);

    ret = decode_entropy_coded_image(s, IMAGE_ROLE_ENTROPY, blocks_w, blocks_h);
    if (ret < 0)
        return ret;

    img = &s->image[IMAGE_ROLE_ENTROPY];
    img->size_reduction = block_bits;

    /* the number of huffman groups is determined by the maximum group number
     * coded in the entropy image */
    max = 0;
    for (y = 0; y < img->frame->height; y++) {
        for (x = 0; x < img->frame->width; x++) {
            int p0 = GET_PIXEL_COMP(img->frame, x, y, 1);
            int p1 = GET_PIXEL_COMP(img->frame, x, y, 2);
            int p  = p0 << 8 | p1;
            max = FFMAX(max, p);
        }
    }
    s->nb_huffman_groups = max + 1;

    return 0;
}

Project: FFmpeg
File: webp.c

static int huff_reader_build_canonical(HuffReader *r, int *code_lengths,
                                       int alphabet_size)
{
    int len = 0, sym, code = 0, ret;
    int max_code_length = 0;
    uint16_t *codes;

    /* special-case 1 symbol since the vlc reader cannot handle it */
    for (sym = 0; sym < alphabet_size; sym++) {
        if (code_lengths[sym] > 0) {
            len++;
            code = sym;
            if (len > 1)
                break;
        }
    }
    if (len == 1) {
        r->nb_symbols = 1;
        r->simple_symbols[0] = code;
        r->simple = 1;
        return 0;
    }

    for (sym = 0; sym < alphabet_size; sym++)
        max_code_length = FFMAX(max_code_length, code_lengths[sym]);

    if (max_code_length == 0 || max_code_length > MAX_HUFFMAN_CODE_LENGTH)
        return AVERROR(EINVAL);

    codes = av_malloc_array(alphabet_size, sizeof(*codes));
    if (!codes)
        return AVERROR(ENOMEM);

    code = 0;
    r->nb_symbols = 0;
    for (len = 1; len <= max_code_length; len++) {
        for (sym = 0; sym < alphabet_size; sym++) {
            if (code_lengths[sym] != len)
                continue;
            codes[sym] = code++;
            r->nb_symbols++;
        }
        code <<= 1;
    }
    if (!r->nb_symbols) {
        av_free(codes);
        return AVERROR_INVALIDDATA;
    }

    ret = init_vlc(&r->vlc, 8, alphabet_size,
                   code_lengths, sizeof(*code_lengths), sizeof(*code_lengths),
                   codes, sizeof(*codes), sizeof(*codes), 0);
    if (ret < 0) {
        av_free(codes);
        return ret;
    }
    r->simple = 0;

    av_free(codes);
    return 0;
}

Project: FFmpeg
File: webp.c

static int huff_reader_get_symbol(HuffReader *r, GetBitContext *gb)
{
    if (r->simple) {
        if (r->nb_symbols == 1)
            return r->simple_symbols[0];
        else
            return r->simple_symbols[get_bits1(gb)];
    } else
        return webp_get_vlc(gb, r->vlc.table);
}

Project: FFmpeg
File: webp.c

static void image_ctx_free(ImageContext *img)
{
    int i, j;

    av_free(img->color_cache);
    if (img->role != IMAGE_ROLE_ARGB && !img->is_alpha_primary)
        av_frame_free(&img->frame);
    if (img->huffman_groups) {
        for (i = 0; i < img->nb_huffman_groups; i++) {
            for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; j++)
                ff_free_vlc(&img->huffman_groups[i * HUFFMAN_CODES_PER_META_CODE + j].vlc);
        }
        av_free(img->huffman_groups);
    }
    memset(img, 0, sizeof(*img));
}

Project: FFmpeg
File: webp.c

static void inv_predict_1(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    AV_COPY32(p, p_l);
}

Project: FFmpeg
File: webp.c

static void inv_predict_10(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                           const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = (p_l[0] + p_tl[0] >> 1) + (p_t[0] + p_tr[0] >> 1) >> 1;
    p[1] = (p_l[1] + p_tl[1] >> 1) + (p_t[1] + p_tr[1] >> 1) >> 1;
    p[2] = (p_l[2] + p_tl[2] >> 1) + (p_t[2] + p_tr[2] >> 1) >> 1;
    p[3] = (p_l[3] + p_tl[3] >> 1) + (p_t[3] + p_tr[3] >> 1) >> 1;
}

Project: FFmpeg
File: webp.c

static void inv_predict_11(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                           const uint8_t *p_t, const uint8_t *p_tr)
{
    int diff = (FFABS(p_l[0] - p_tl[0]) - FFABS(p_t[0] - p_tl[0])) +
               (FFABS(p_l[1] - p_tl[1]) - FFABS(p_t[1] - p_tl[1])) +
               (FFABS(p_l[2] - p_tl[2]) - FFABS(p_t[2] - p_tl[2])) +
               (FFABS(p_l[3] - p_tl[3]) - FFABS(p_t[3] - p_tl[3]));
    if (diff <= 0)
        AV_COPY32(p, p_t);
    else
        AV_COPY32(p, p_l);
}

Project: FFmpeg
File: webp.c

static void inv_predict_13(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                           const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = clamp_add_subtract_half(p_l[0], p_t[0], p_tl[0]);
    p[1] = clamp_add_subtract_half(p_l[1], p_t[1], p_tl[1]);
    p[2] = clamp_add_subtract_half(p_l[2], p_t[2], p_tl[2]);
    p[3] = clamp_add_subtract_half(p_l[3], p_t[3], p_tl[3]);
}

Project: FFmpeg
File: webp.c

static void inv_predict_2(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    AV_COPY32(p, p_t);
}

Project: FFmpeg
File: webp.c

static void inv_predict_3(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    AV_COPY32(p, p_tr);
}

Project: FFmpeg
File: webp.c

static void inv_predict_4(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    AV_COPY32(p, p_tl);
}

Project: FFmpeg
File: webp.c

static void inv_predict_5(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = p_t[0] + (p_l[0] + p_tr[0] >> 1) >> 1;
    p[1] = p_t[1] + (p_l[1] + p_tr[1] >> 1) >> 1;
    p[2] = p_t[2] + (p_l[2] + p_tr[2] >> 1) >> 1;
    p[3] = p_t[3] + (p_l[3] + p_tr[3] >> 1) >> 1;
}

Project: FFmpeg
File: webp.c

static void inv_predict_6(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = p_l[0] + p_tl[0] >> 1;
    p[1] = p_l[1] + p_tl[1] >> 1;
    p[2] = p_l[2] + p_tl[2] >> 1;
    p[3] = p_l[3] + p_tl[3] >> 1;
}

Project: FFmpeg
File: webp.c

static void inv_predict_7(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = p_l[0] + p_t[0] >> 1;
    p[1] = p_l[1] + p_t[1] >> 1;
    p[2] = p_l[2] + p_t[2] >> 1;
    p[3] = p_l[3] + p_t[3] >> 1;
}

Project: FFmpeg
File: webp.c

static void inv_predict_8(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = p_tl[0] + p_t[0] >> 1;
    p[1] = p_tl[1] + p_t[1] >> 1;
    p[2] = p_tl[2] + p_t[2] >> 1;
    p[3] = p_tl[3] + p_t[3] >> 1;
}

Project: FFmpeg
File: webp.c

static void inv_predict_9(uint8_t *p, const uint8_t *p_l, const uint8_t *p_tl,
                          const uint8_t *p_t, const uint8_t *p_tr)
{
    p[0] = p_t[0] + p_tr[0] >> 1;
    p[1] = p_t[1] + p_tr[1] >> 1;
    p[2] = p_t[2] + p_tr[2] >> 1;
    p[3] = p_t[3] + p_tr[3] >> 1;
}

Project: FFmpeg
File: webp.c

static void inverse_prediction(AVFrame *frame, enum PredictionMode m, int x, int y)
{
    uint8_t *dec, *p_l, *p_tl, *p_t, *p_tr;
    uint8_t p[4];

    dec  = GET_PIXEL(frame, x,     y);
    p_l  = GET_PIXEL(frame, x - 1, y);
    p_tl = GET_PIXEL(frame, x - 1, y - 1);
    p_t  = GET_PIXEL(frame, x,     y - 1);
    if (x == frame->width - 1)
        p_tr = GET_PIXEL(frame, 0, y);
    else
        p_tr = GET_PIXEL(frame, x + 1, y - 1);

    inverse_predict[m](p, p_l, p_tl, p_t, p_tr);

    dec[0] += p[0];
    dec[1] += p[1];
    dec[2] += p[2];
    dec[3] += p[3];
}

Project: FFmpeg
File: webp.c

static int parse_transform_color(WebPContext *s)
{
    int block_bits, blocks_w, blocks_h, ret;

    PARSE_BLOCK_SIZE(s->width, s->height);

    ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_TRANSFORM, blocks_w,
                                     blocks_h);
    if (ret < 0)
        return ret;

    s->image[IMAGE_ROLE_COLOR_TRANSFORM].size_reduction = block_bits;

    return 0;
}

Project: FFmpeg
File: webp.c

static int parse_transform_color_indexing(WebPContext *s)
{
    ImageContext *img;
    int width_bits, index_size, ret, x;
    uint8_t *ct;

    index_size = get_bits(&s->gb, 8) + 1;

    if (index_size <= 2)
        width_bits = 3;
    else if (index_size <= 4)
        width_bits = 2;
    else if (index_size <= 16)
        width_bits = 1;
    else
        width_bits = 0;

    ret = decode_entropy_coded_image(s, IMAGE_ROLE_COLOR_INDEXING,
                                     index_size, 1);
    if (ret < 0)
        return ret;

    img = &s->image[IMAGE_ROLE_COLOR_INDEXING];
    img->size_reduction = width_bits;
    if (width_bits > 0)
        s->reduced_width = (s->width + ((1 << width_bits) - 1)) >> width_bits;

    /* color index values are delta-coded */
    ct  = img->frame->data[0] + 4;
    for (x = 4; x < img->frame->width * 4; x++, ct++)
        ct[0] += ct[-4];

    return 0;
}

Project: FFmpeg
File: webp.c

static int parse_transform_predictor(WebPContext *s)
{
    int block_bits, blocks_w, blocks_h, ret;

    PARSE_BLOCK_SIZE(s->width, s->height);

    ret = decode_entropy_coded_image(s, IMAGE_ROLE_PREDICTOR, blocks_w,
                                     blocks_h);
    if (ret < 0)
        return ret;

    s->image[IMAGE_ROLE_PREDICTOR].size_reduction = block_bits;

    return 0;
}

Project: FFmpeg
File: webp.c

static int read_huffman_code_normal(WebPContext *s, HuffReader *hc,
                                    int alphabet_size)
{
    HuffReader code_len_hc = { { 0 }, 0, 0, { 0 } };
    int *code_lengths = NULL;
    int code_length_code_lengths[NUM_CODE_LENGTH_CODES] = { 0 };
    int i, symbol, max_symbol, prev_code_len, ret;
    int num_codes = 4 + get_bits(&s->gb, 4);

    if (num_codes > NUM_CODE_LENGTH_CODES)
        return AVERROR_INVALIDDATA;

    for (i = 0; i < num_codes; i++)
        code_length_code_lengths[code_length_code_order[i]] = get_bits(&s->gb, 3);

    ret = huff_reader_build_canonical(&code_len_hc, code_length_code_lengths,
                                      NUM_CODE_LENGTH_CODES);
    if (ret < 0)
        goto finish;

    code_lengths = av_mallocz_array(alphabet_size, sizeof(*code_lengths));
    if (!code_lengths) {
        ret = AVERROR(ENOMEM);
        goto finish;
    }

    if (get_bits1(&s->gb)) {
        int bits   = 2 + 2 * get_bits(&s->gb, 3);
        max_symbol = 2 + get_bits(&s->gb, bits);
        if (max_symbol > alphabet_size) {
            av_log(s->avctx, AV_LOG_ERROR, "max symbol %d > alphabet size %d\n",
                   max_symbol, alphabet_size);
            ret = AVERROR_INVALIDDATA;
            goto finish;
        }
    } else {
        max_symbol = alphabet_size;
    }

    prev_code_len = 8;
    symbol        = 0;
    while (symbol < alphabet_size) {
        int code_len;

        if (!max_symbol--)
            break;
        code_len = huff_reader_get_symbol(&code_len_hc, &s->gb);
        if (code_len < 16) {
            /* Code length code [0..15] indicates literal code lengths. */
            code_lengths[symbol++] = code_len;
            if (code_len)
                prev_code_len = code_len;
        } else {
            int repeat = 0, length = 0;
            switch (code_len) {
            case 16:
                /* Code 16 repeats the previous non-zero value [3..6] times,
                 * i.e., 3 + ReadBits(2) times. If code 16 is used before a
                 * non-zero value has been emitted, a value of 8 is repeated. */
                repeat = 3 + get_bits(&s->gb, 2);
                length = prev_code_len;
                break;
            case 17:
                /* Code 17 emits a streak of zeros [3..10], i.e.,
                 * 3 + ReadBits(3) times. */
                repeat = 3 + get_bits(&s->gb, 3);
                break;
            case 18:
                /* Code 18 emits a streak of zeros of length [11..138], i.e.,
                 * 11 + ReadBits(7) times. */
                repeat = 11 + get_bits(&s->gb, 7);
                break;
            }
            if (symbol + repeat > alphabet_size) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "invalid symbol %d + repeat %d > alphabet size %d\n",
                       symbol, repeat, alphabet_size);
                ret = AVERROR_INVALIDDATA;
                goto finish;
            }
            while (repeat-- > 0)
                code_lengths[symbol++] = length;
        }
    }

    ret = huff_reader_build_canonical(hc, code_lengths, alphabet_size);

finish:
    ff_free_vlc(&code_len_hc.vlc);
    av_free(code_lengths);
    return ret;
}

Project: FFmpeg
File: webp.c

static void read_huffman_code_simple(WebPContext *s, HuffReader *hc)
{
    hc->nb_symbols = get_bits1(&s->gb) + 1;

    if (get_bits1(&s->gb))
        hc->simple_symbols[0] = get_bits(&s->gb, 8);
    else
        hc->simple_symbols[0] = get_bits1(&s->gb);

    if (hc->nb_symbols == 2)
        hc->simple_symbols[1] = get_bits(&s->gb, 8);

    hc->simple = 1;
}

Project: FFmpeg
File: webp.c

static void update_canvas_size(AVCodecContext *avctx, int w, int h)
{
    WebPContext *s = avctx->priv_data;
    if (s->width && s->width != w) {
        av_log(avctx, AV_LOG_WARNING, "Width mismatch. %d != %d\n",
               s->width, w);
    }
    s->width = w;
    if (s->height && s->height != h) {
        av_log(avctx, AV_LOG_WARNING, "Height mismatch. %d != %d\n",
               s->height, h);
    }
    s->height = h;
}

Project: FFmpeg
File: webp.c

static int vp8_lossless_decode_frame(AVCodecContext *avctx, AVFrame *p,
                                     int *got_frame, uint8_t *data_start,
                                     unsigned int data_size, int is_alpha_chunk)
{
    WebPContext *s = avctx->priv_data;
    int w, h, ret, i, used;

    if (!is_alpha_chunk) {
        s->lossless = 1;
        avctx->pix_fmt = AV_PIX_FMT_ARGB;
    }

    ret = init_get_bits8(&s->gb, data_start, data_size);
    if (ret < 0)
        return ret;

    if (!is_alpha_chunk) {
        if (get_bits(&s->gb, 8) != 0x2F) {
            av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless signature\n");
            return AVERROR_INVALIDDATA;
        }

        w = get_bits(&s->gb, 14) + 1;
        h = get_bits(&s->gb, 14) + 1;

        update_canvas_size(avctx, w, h);

        ret = ff_set_dimensions(avctx, s->width, s->height);
        if (ret < 0)
            return ret;

        s->has_alpha = get_bits1(&s->gb);

        if (get_bits(&s->gb, 3) != 0x0) {
            av_log(avctx, AV_LOG_ERROR, "Invalid WebP Lossless version\n");
            return AVERROR_INVALIDDATA;
        }
    } else {
        if (!s->width || !s->height)
            return AVERROR_BUG;
        w = s->width;
        h = s->height;
    }

    /* parse transformations */
    s->nb_transforms = 0;
    s->reduced_width = 0;
    used = 0;
    while (get_bits1(&s->gb)) {
        enum TransformType transform = get_bits(&s->gb, 2);
        if (used & (1 << transform)) {
            av_log(avctx, AV_LOG_ERROR, "Transform %d used more than once\n",
                   transform);
            ret = AVERROR_INVALIDDATA;
            goto free_and_return;
        }
        used |= (1 << transform);
        s->transforms[s->nb_transforms++] = transform;
        switch (transform) {
        case PREDICTOR_TRANSFORM:
            ret = parse_transform_predictor(s);
            break;
        case COLOR_TRANSFORM:
            ret = parse_transform_color(s);
            break;
        case COLOR_INDEXING_TRANSFORM:
            ret = parse_transform_color_indexing(s);
            break;
        }
        if (ret < 0)
            goto free_and_return;
    }

    /* decode primary image */
    s->image[IMAGE_ROLE_ARGB].frame = p;
    if (is_alpha_chunk)
        s->image[IMAGE_ROLE_ARGB].is_alpha_primary = 1;
    ret = decode_entropy_coded_image(s, IMAGE_ROLE_ARGB, w, h);
    if (ret < 0)
        goto free_and_return;

    /* apply transformations */
    for (i = s->nb_transforms - 1; i >= 0; i--) {
        switch (s->transforms[i]) {
        case PREDICTOR_TRANSFORM:
            ret = apply_predictor_transform(s);
            break;
        case COLOR_TRANSFORM:
            ret = apply_color_transform(s);
            break;
        case SUBTRACT_GREEN:
            ret = apply_subtract_green_transform(s);
            break;
        case COLOR_INDEXING_TRANSFORM:
            ret = apply_color_indexing_transform(s);
            break;
        }
        if (ret < 0)
            goto free_and_return;
    }

    *got_frame   = 1;
    p->pict_type = AV_PICTURE_TYPE_I;
    p->key_frame = 1;
    ret          = data_size;

free_and_return:
    for (i = 0; i < IMAGE_ROLE_NB; i++)
        image_ctx_free(&s->image[i]);

    return ret;
}

Project: FFmpeg
File: webp.c

static int vp8_lossy_decode_alpha(AVCodecContext *avctx, AVFrame *p,
                                  uint8_t *data_start,
                                  unsigned int data_size)
{
    WebPContext *s = avctx->priv_data;
    int x, y, ret;

    if (s->alpha_compression == ALPHA_COMPRESSION_NONE) {
        GetByteContext gb;

        bytestream2_init(&gb, data_start, data_size);
        for (y = 0; y < s->height; y++)
            bytestream2_get_buffer(&gb, p->data[3] + p->linesize[3] * y,
                                   s->width);
    } else if (s->alpha_compression == ALPHA_COMPRESSION_VP8L) {
        uint8_t *ap, *pp;
        int alpha_got_frame = 0;

        s->alpha_frame = av_frame_alloc();
        if (!s->alpha_frame)
            return AVERROR(ENOMEM);

        ret = vp8_lossless_decode_frame(avctx, s->alpha_frame, &alpha_got_frame,
                                        data_start, data_size, 1);
        if (ret < 0) {
            av_frame_free(&s->alpha_frame);
            return ret;
        }
        if (!alpha_got_frame) {
            av_frame_free(&s->alpha_frame);
            return AVERROR_INVALIDDATA;
        }

        /* copy green component of alpha image to alpha plane of primary image */
        for (y = 0; y < s->height; y++) {
            ap = GET_PIXEL(s->alpha_frame, 0, y) + 2;
            pp = p->data[3] + p->linesize[3] * y;
            for (x = 0; x < s->width; x++) {
                *pp = *ap;
                pp++;
                ap += 4;
            }
        }
        av_frame_free(&s->alpha_frame);
    }

    /* apply alpha filtering */
    if (s->alpha_filter)
        alpha_inverse_prediction(p, s->alpha_filter);

    return 0;
}

Project: FFmpeg
File: webp.c

static av_cold int webp_decode_close(AVCodecContext *avctx)
{
    WebPContext *s = avctx->priv_data;

    if (s->initialized)
        return ff_vp8_decode_free(avctx);

    return 0;
}

Project: FFmpeg
File: webp.c

static int webp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                             AVPacket *avpkt)
{
    AVFrame * const p = data;
    WebPContext *s = avctx->priv_data;
    GetByteContext gb;
    int ret;
    uint32_t chunk_type, chunk_size;
    int vp8x_flags = 0;

    s->avctx     = avctx;
    s->width     = 0;
    s->height    = 0;
    *got_frame   = 0;
    s->has_alpha = 0;
    s->has_exif  = 0;
    bytestream2_init(&gb, avpkt->data, avpkt->size);

    if (bytestream2_get_bytes_left(&gb) < 12)
        return AVERROR_INVALIDDATA;

    if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
        av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
        return AVERROR_INVALIDDATA;
    }

    chunk_size = bytestream2_get_le32(&gb);
    if (bytestream2_get_bytes_left(&gb) < chunk_size)
        return AVERROR_INVALIDDATA;

    if (bytestream2_get_le32(&gb) != MKTAG('W', 'E', 'B', 'P')) {
        av_log(avctx, AV_LOG_ERROR, "missing WEBP tag\n");
        return AVERROR_INVALIDDATA;
    }

    while (bytestream2_get_bytes_left(&gb) > 8) {
        char chunk_str[5] = { 0 };

        chunk_type = bytestream2_get_le32(&gb);
        chunk_size = bytestream2_get_le32(&gb);
        if (chunk_size == UINT32_MAX)
            return AVERROR_INVALIDDATA;
        chunk_size += chunk_size & 1;

        if (bytestream2_get_bytes_left(&gb) < chunk_size)
            return AVERROR_INVALIDDATA;

        switch (chunk_type) {
        case MKTAG('V', 'P', '8', ' '):
            if (!*got_frame) {
                ret = vp8_lossy_decode_frame(avctx, p, got_frame,
                                             avpkt->data + bytestream2_tell(&gb),
                                             chunk_size);
                if (ret < 0)
                    return ret;
            }
            bytestream2_skip(&gb, chunk_size);
            break;
        case MKTAG('V', 'P', '8', 'L'):
            if (!*got_frame) {
                ret = vp8_lossless_decode_frame(avctx, p, got_frame,
                                                avpkt->data + bytestream2_tell(&gb),
                                                chunk_size, 0);
                if (ret < 0)
                    return ret;
                avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
            }
            bytestream2_skip(&gb, chunk_size);
            break;
        case MKTAG('V', 'P', '8', 'X'):
            if (s->width || s->height || *got_frame) {
                av_log(avctx, AV_LOG_ERROR, "Canvas dimensions are already set\n");
                return AVERROR_INVALIDDATA;
            }
            vp8x_flags = bytestream2_get_byte(&gb);
            bytestream2_skip(&gb, 3);
            s->width  = bytestream2_get_le24(&gb) + 1;
            s->height = bytestream2_get_le24(&gb) + 1;
            ret = av_image_check_size(s->width, s->height, 0, avctx);
            if (ret < 0)
                return ret;
            break;
        case MKTAG('A', 'L', 'P', 'H'): {
            int alpha_header, filter_m, compression;

            if (!(vp8x_flags & VP8X_FLAG_ALPHA)) {
                av_log(avctx, AV_LOG_WARNING,
                       "ALPHA chunk present, but alpha bit not set in the "
                       "VP8X header\n");
            }
            if (chunk_size == 0) {
                av_log(avctx, AV_LOG_ERROR, "invalid ALPHA chunk size\n");
                return AVERROR_INVALIDDATA;
            }
            alpha_header       = bytestream2_get_byte(&gb);
            s->alpha_data      = avpkt->data + bytestream2_tell(&gb);
            s->alpha_data_size = chunk_size - 1;
            bytestream2_skip(&gb, s->alpha_data_size);

            filter_m    = (alpha_header >> 2) & 0x03;
            compression =  alpha_header       & 0x03;

            if (compression > ALPHA_COMPRESSION_VP8L) {
                av_log(avctx, AV_LOG_VERBOSE,
                       "skipping unsupported ALPHA chunk\n");
            } else {
                s->has_alpha         = 1;
                s->alpha_compression = compression;
                s->alpha_filter      = filter_m;
            }

            break;
        }
        case MKTAG('E', 'X', 'I', 'F'): {
            int le, ifd_offset, exif_offset = bytestream2_tell(&gb);
            AVDictionary *exif_metadata = NULL;
            GetByteContext exif_gb;

            if (s->has_exif) {
                av_log(avctx, AV_LOG_VERBOSE, "Ignoring extra EXIF chunk\n");
                goto exif_end;
            }
            if (!(vp8x_flags & VP8X_FLAG_EXIF_METADATA))
                av_log(avctx, AV_LOG_WARNING,
                       "EXIF chunk present, but Exif bit not set in the "
                       "VP8X header\n");

            s->has_exif = 1;
            bytestream2_init(&exif_gb, avpkt->data + exif_offset,
                             avpkt->size - exif_offset);
            if (ff_tdecode_header(&exif_gb, &le, &ifd_offset) < 0) {
                av_log(avctx, AV_LOG_ERROR, "invalid TIFF header "
                       "in Exif data\n");
                goto exif_end;
            }

            bytestream2_seek(&exif_gb, ifd_offset, SEEK_SET);
            if (avpriv_exif_decode_ifd(avctx, &exif_gb, le, 0, &exif_metadata) < 0) {
                av_log(avctx, AV_LOG_ERROR, "error decoding Exif data\n");
                goto exif_end;
            }

            av_dict_copy(&((AVFrame *) data)->metadata, exif_metadata, 0);

exif_end:
            av_dict_free(&exif_metadata);
            bytestream2_skip(&gb, chunk_size);
            break;
        }
        case MKTAG('I', 'C', 'C', 'P'):
        case MKTAG('A', 'N', 'I', 'M'):
        case MKTAG('A', 'N', 'M', 'F'):
        case MKTAG('X', 'M', 'P', ' '):
            AV_WL32(chunk_str, chunk_type);
            av_log(avctx, AV_LOG_WARNING, "skipping unsupported chunk: %s\n",
                   chunk_str);
            bytestream2_skip(&gb, chunk_size);
            break;
        default:
            AV_WL32(chunk_str, chunk_type);
            av_log(avctx, AV_LOG_VERBOSE, "skipping unknown chunk: %s\n",
                   chunk_str);
            bytestream2_skip(&gb, chunk_size);
            break;
        }
    }

    if (!*got_frame) {
        av_log(avctx, AV_LOG_ERROR, "image data not found\n");
        return AVERROR_INVALIDDATA;
    }

    return avpkt->size;
}

Project: FFmpeg
File: webp.c

static av_always_inline int webp_get_vlc(GetBitContext *gb, VLC_TYPE (*table)[2])
{
    int n, nb_bits;
    unsigned int index;
    int code;

    OPEN_READER(re, gb);
    UPDATE_CACHE(re, gb);

    index = SHOW_UBITS(re, gb, 8);
    index = ff_reverse[index];
    code  = table[index][0];
    n     = table[index][1];

    if (n < 0) {
        LAST_SKIP_BITS(re, gb, 8);
        UPDATE_CACHE(re, gb);

        nb_bits = -n;

        index = SHOW_UBITS(re, gb, nb_bits);
        index = (ff_reverse[index] >> (8 - nb_bits)) + code;
        code  = table[index][0];
        n     = table[index][1];
    }
    SKIP_BITS(re, gb, n);

    CLOSE_READER(re, gb);

    return code;
}