static int do_decode(AVCodecContext *avctx, AVPacket *pkt) { int got_frame; int ret; av_assert0(!avctx->internal->buffer_frame->buf[0]); if (!pkt) pkt = avctx->internal->buffer_pkt; // This is the lesser evil. The field is for compatibility with legacy users // of the legacy API, and users using the new API should not be forced to // even know about this field. avctx->refcounted_frames = 1; // Some codecs (at least wma lossless) will crash when feeding drain packets // after EOF was signaled. if (avctx->internal->draining_done) return AVERROR_EOF; if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) { ret = avcodec_decode_video2(avctx, avctx->internal->buffer_frame, &got_frame, pkt); if (ret >= 0 && !(avctx->flags & AV_CODEC_FLAG_TRUNCATED)) ret = pkt->size; } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) { ret = avcodec_decode_audio4(avctx, avctx->internal->buffer_frame, &got_frame, pkt); } else { ret = AVERROR(EINVAL); } if (ret == AVERROR(EAGAIN)) ret = pkt->size; if (ret < 0) return ret; if (avctx->internal->draining && !got_frame) avctx->internal->draining_done = 1; if (ret >= pkt->size) { av_packet_unref(avctx->internal->buffer_pkt); } else { int consumed = ret; if (pkt != avctx->internal->buffer_pkt) { av_packet_unref(avctx->internal->buffer_pkt); if ((ret = av_packet_ref(avctx->internal->buffer_pkt, pkt)) < 0) return ret; } avctx->internal->buffer_pkt->data += consumed; avctx->internal->buffer_pkt->size -= consumed; avctx->internal->buffer_pkt->pts = AV_NOPTS_VALUE; avctx->internal->buffer_pkt->dts = AV_NOPTS_VALUE; } if (got_frame) av_assert0(avctx->internal->buffer_frame->buf[0]); return 0; }