static int mpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; Mpeg1Context *s = avctx->priv_data; AVFrame *picture = data; MpegEncContext *s2 = &s->mpeg_enc_ctx; av_dlog(avctx, "fill_buffer\n"); if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) { /* special case for last picture */ if (s2->low_delay == 0 && s2->next_picture_ptr) { *picture = s2->next_picture_ptr->f; s2->next_picture_ptr = NULL; *data_size = sizeof(AVFrame); } return buf_size; } if (s2->flags & CODEC_FLAG_TRUNCATED) { int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL); if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0) return buf_size; } s2->codec_tag = avpriv_toupper4(avctx->codec_tag); if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2") || s2->codec_tag == AV_RL32("BW10") )) vcr2_init_sequence(avctx); s->slice_count = 0; if (avctx->extradata && !avctx->frame_number) { int ret = decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size); if(*data_size) { av_log(avctx, AV_LOG_ERROR, "picture in extradata\n"); *data_size = 0; } if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) return ret; } return decode_chunks(avctx, picture, data_size, buf, buf_size); }