[ffmpeg] 获取编码后视频的IPB帧类型

背景

如何获取编码后的视频帧类型

方法

uint8_t* data = NULL;
size_t size = 0;
data = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS, &size);
type = (enum AVPictureType)data[4];
cout 
	// .... 
    switch (pic_out.i_type) {
    case X264_TYPE_IDR:
    case X264_TYPE_I:
        pict_type = AV_PICTURE_TYPE_I;
        break;
    case X264_TYPE_P:
        pict_type = AV_PICTURE_TYPE_P;
        break;
    case X264_TYPE_B:
    case X264_TYPE_BREF:
        pict_type = AV_PICTURE_TYPE_B;
        break;
    default:
        av_log(ctx, AV_LOG_ERROR, "Unknown picture type encountered.\n");
        return AVERROR_EXTERNAL;
    }
    pkt-flags |= AV_PKT_FLAG_KEY*pic_out.b_keyframe;
    if (ret) {
        ff_side_data_set_encoder_stats(pkt, (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA, NULL, 0, pict_type);
        if (wallclock)
            ff_side_data_set_prft(pkt, wallclock);
    }
    *got_packet = ret;
    return 0;
}
int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type)
{
    uint8_t *side_data;
    size_t side_data_size;
    int i;
    side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS, &side_data_size);
    if (!side_data) {
        side_data_size = 4+4+8*error_count;
        side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
                                            side_data_size);
    }
    if (!side_data || side_data_size