static int vp3_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; Vp3DecodeContext *s = avctx->priv_data; GetBitContext gb; static int counter = 0; int i; init_get_bits(&gb, buf, buf_size * 8); if (s->theora && get_bits1(&gb)) { av_log(avctx, AV_LOG_ERROR, "Header packet passed to frame decoder, skipping\n"); return -1; } s->keyframe = !get_bits1(&gb); if (!s->theora) skip_bits(&gb, 1); for (i = 0; i < 3; i++) s->last_qps[i] = s->qps[i]; s->nqps=0; do{ s->qps[s->nqps++]= get_bits(&gb, 6); } while(s->theora >= 0x030200 && s->nqps<3 && get_bits1(&gb)); for (i = s->nqps; i < 3; i++) s->qps[i] = -1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, " VP3 %sframe #%d: Q index = %d\n", s->keyframe?"key":"", counter, s->qps[0]); counter++; if (s->qps[0] != s->last_qps[0]) init_loop_filter(s); for (i = 0; i < s->nqps; i++) // reinit all dequantizers if the first one changed, because // the DC of the first quantizer must be used for all matrices if (s->qps[i] != s->last_qps[i] || s->qps[0] != s->last_qps[0]) init_dequantizer(s, i); if (avctx->skip_frame >= AVDISCARD_NONKEY && !s->keyframe) return buf_size; s->current_frame.reference = 3; if (avctx->get_buffer(avctx, &s->current_frame) < 0) { av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } if (s->keyframe) { if (!s->theora) { skip_bits(&gb, 4); /* width code */ skip_bits(&gb, 4); /* height code */ if (s->version) { s->version = get_bits(&gb, 5); if (counter == 1) av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version); } } if (s->version || s->theora) { if (get_bits1(&gb)) av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n"); skip_bits(&gb, 2); /* reserved? */ } } else { if (!s->golden_frame.data[0]) { av_log(s->avctx, AV_LOG_ERROR, "vp3: first frame not a keyframe\n"); avctx->release_buffer(avctx, &s->current_frame); return -1; } } s->current_frame.qscale_table= s->qscale_table; //FIXME allocate individual tables per AVFrame s->current_frame.qstride= 0; init_frame(s, &gb); if (unpack_superblocks(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_superblocks\n"); return -1; } if (unpack_modes(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_modes\n"); return -1; } if (unpack_vectors(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_vectors\n"); return -1; } if (unpack_block_qpis(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_block_qpis\n"); return -1; } if (unpack_dct_coeffs(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_dct_coeffs\n"); return -1; } for (i = 0; i < 3; i++) { if (s->flipped_image) s->data_offset[i] = 0; else s->data_offset[i] = ((s->height>>!!i)-1) * s->current_frame.linesize[i]; } s->last_slice_end = 0; for (i = 0; i < s->c_superblock_height; i++) render_slice(s, i); // filter the last row for (i = 0; i < 3; i++) { int row = (s->height >> (3+!!i)) - 1; apply_loop_filter(s, i, row, row+1); } vp3_draw_horiz_band(s, s->height); *data_size=sizeof(AVFrame); *(AVFrame*)data= s->current_frame; /* release the last frame, if it is allocated and if it is not the * golden frame */ if ((s->last_frame.data[0]) && (s->last_frame.data[0] != s->golden_frame.data[0])) avctx->release_buffer(avctx, &s->last_frame); /* shuffle frames (last = current) */ s->last_frame= s->current_frame; if (s->keyframe) { if (s->golden_frame.data[0]) avctx->release_buffer(avctx, &s->golden_frame); s->golden_frame = s->current_frame; } s->current_frame.data[0]= NULL; /* ensure that we catch any access to this released frame */ return buf_size; }