static int pnm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; PNMContext * const s = avctx->priv_data; AVFrame *picture = data; AVFrame * const p = (AVFrame*)&s->picture; int i, j, n, linesize, h, upgrade = 0; unsigned char *ptr; int components, sample_len; s->bytestream_start = s->bytestream = buf; s->bytestream_end = buf + buf_size; if (ff_pnm_decode_header(avctx, s) < 0) return -1; if (p->data[0]) avctx->release_buffer(avctx, p); p->reference = 0; if (avctx->get_buffer(avctx, p) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } p->pict_type = AV_PICTURE_TYPE_I; p->key_frame = 1; switch (avctx->pix_fmt) { default: return -1; case PIX_FMT_RGB48BE: n = avctx->width * 6; components=3; sample_len=16; goto do_read; case PIX_FMT_RGB24: n = avctx->width * 3; components=3; sample_len=8; goto do_read; case PIX_FMT_GRAY8: n = avctx->width; components=1; sample_len=8; if (s->maxval < 255) upgrade = 1; goto do_read; case PIX_FMT_GRAY16BE: case PIX_FMT_GRAY16LE: n = avctx->width * 2; components=1; sample_len=16; if (s->maxval < 65535) upgrade = 2; goto do_read; case PIX_FMT_MONOWHITE: case PIX_FMT_MONOBLACK: n = (avctx->width + 7) >> 3; components=1; sample_len=1; do_read: ptr = p->data[0]; linesize = p->linesize[0]; if (s->bytestream + n * avctx->height > s->bytestream_end) return -1; if(s->type < 4){ for (i=0; i<avctx->height; i++) { PutBitContext pb; init_put_bits(&pb, ptr, linesize); for(j=0; j<avctx->width * components; j++){ unsigned int c=0; int v=0; while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' )) s->bytestream++; if(s->bytestream >= s->bytestream_end) return -1; do{ v= 10*v + c; c= (*s->bytestream++) - '0'; }while(c <= 9); put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval); } flush_put_bits(&pb); ptr+= linesize; } }else{ for (i = 0; i < avctx->height; i++) { if (!upgrade) memcpy(ptr, s->bytestream, n); else if (upgrade == 1) { unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval; for (j = 0; j < n; j++) ptr[j] = (s->bytestream[j] * f + 64) >> 7; } else if (upgrade == 2) { unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval; for (j = 0; j < n / 2; j++) { v = av_be2ne16(((uint16_t *)s->bytestream)[j]); ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15; } } s->bytestream += n; ptr += linesize; } } break; case PIX_FMT_YUV420P: { unsigned char *ptr1, *ptr2; n = avctx->width; ptr = p->data[0]; linesize = p->linesize[0]; if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) return -1; for (i = 0; i < avctx->height; i++) { memcpy(ptr, s->bytestream, n); s->bytestream += n; ptr += linesize; } ptr1 = p->data[1]; ptr2 = p->data[2]; n >>= 1; h = avctx->height >> 1; for (i = 0; i < h; i++) { memcpy(ptr1, s->bytestream, n); s->bytestream += n; memcpy(ptr2, s->bytestream, n); s->bytestream += n; ptr1 += p->linesize[1]; ptr2 += p->linesize[2]; } } break; case PIX_FMT_RGB32: ptr = p->data[0]; linesize = p->linesize[0]; if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end) return -1; for (i = 0; i < avctx->height; i++) { int j, r, g, b, a; for (j = 0; j < avctx->width; j++) { r = *s->bytestream++; g = *s->bytestream++; b = *s->bytestream++; a = *s->bytestream++; ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b; } ptr += linesize; } break; } *picture = *(AVFrame*)&s->picture; *data_size = sizeof(AVPicture); return s->bytestream - s->bytestream_start; }