Function packet_decode

fftools/ffmpeg_dec.c:699–834

}

static int packet_decode(DecoderPriv *dp, AVPacket *pkt, AVFrame *frame)
{
    AVCodecContext *dec = dp->dec_ctx;
    const char *type_desc = av_get_media_type_string(dec->codec_type);
    int ret;

    if (dec->codec_type == AVMEDIA_TYPE_SUBTITLE)
        return transcode_subtitles(dp, pkt, frame);

    // With fate-indeo3-2, we're getting 0-sized packets before EOF for some
    // reason. This seems like a semi-critical bug. Don't trigger EOF, and
    // skip the packet.
    if (pkt && pkt->size == 0)
        return 0;

    if (pkt && (dp->flags & DECODER_FLAG_TS_UNRELIABLE)) {
        pkt->pts = AV_NOPTS_VALUE;
        pkt->dts = AV_NOPTS_VALUE;
    }

    if (pkt) {
        FrameData *fd = packet_data(pkt);
        if (!fd)
            return AVERROR(ENOMEM);
        fd->wallclock[LATENCY_PROBE_DEC_PRE] = av_gettime_relative();
    }

    ret = avcodec_send_packet(dec, pkt);
    if (ret < 0 && !(ret == AVERROR_EOF && !pkt)) {
        // In particular, we don't expect AVERROR(EAGAIN), because we read all
        // decoded frames with avcodec_receive_frame() until done.
        if (ret == AVERROR(EAGAIN)) {
            av_log(dp, AV_LOG_FATAL, "A decoder returned an unexpected error code. "
                                     "This is a bug, please report it.\n");
            return AVERROR_BUG;
        }
        av_log(dp, AV_LOG_ERROR, "Error submitting %s to decoder: %s\n",
               pkt ? "packet" : "EOF", av_err2str(ret));

        if (ret == AVERROR_EOF)
            return ret;

        dp->dec.decode_errors++;
        if (exit_on_error)
            return ret;
    }

    while (1) {
        FrameData *fd;
        unsigned outputs_mask = 1;
        unsigned flags = 0;
        if (!dp->dec.frames_decoded)
            flags |= AV_CODEC_RECEIVE_FRAME_FLAG_SYNCHRONOUS;

        av_frame_unref(frame);

        update_benchmark(NULL);
        ret = avcodec_receive_frame_flags(dec, frame, flags);