extract_stream_metadata()

void MayaFlux::IO::VideoStreamContext::extract_stream_metadata	(	const FFmpegDemuxContext &	demux,
		FileMetadata &	out
	)		const

Populate stream-specific fields into an existing FileMetadata.

Appends codec name, pixel format, dimensions, frame rate, bit_rate, etc.

Parameters

demux	The demux context that owns the format_context.
out	Metadata struct to append into.

Definition at line 392 of file VideoStreamContext.cpp.

{
    if (!codec_context || stream_index < 0)
        return;
 
    out.attributes["video_codec"] = std::string(avcodec_get_name(codec_context->codec_id));
    if (codec_context->codec && codec_context->codec->long_name)
        out.attributes["video_codec_long_name"] = std::string(codec_context->codec->long_name);
    out.attributes["video_width"] = width;
    out.attributes["video_height"] = height;
    out.attributes["video_frame_rate"] = frame_rate;
    out.attributes["video_total_frames"] = total_frames;
    out.attributes["video_bit_rate"] = codec_context->bit_rate;
 
    const char* pix_fmt_name = av_get_pix_fmt_name(codec_context->pix_fmt);
    if (pix_fmt_name)
        out.attributes["video_pixel_format"] = std::string(pix_fmt_name);
 
    if (codec_context->color_range != AVCOL_RANGE_UNSPECIFIED)
        out.attributes["video_color_range"] = static_cast<int>(codec_context->color_range);
    if (codec_context->colorspace != AVCOL_SPC_UNSPECIFIED)
        out.attributes["video_colorspace"] = static_cast<int>(codec_context->colorspace);
    if (codec_context->color_trc != AVCOL_TRC_UNSPECIFIED)
        out.attributes["video_color_trc"] = static_cast<int>(codec_context->color_trc);
    if (codec_context->color_primaries != AVCOL_PRI_UNSPECIFIED)
        out.attributes["video_color_primaries"] = static_cast<int>(codec_context->color_primaries);
 
    AVStream* stream = demux.get_stream(stream_index);
    if (!stream)
        return;
 
    if (stream->sample_aspect_ratio.num > 0 && stream->sample_aspect_ratio.den > 0) {
        out.attributes["video_sar_num"] = stream->sample_aspect_ratio.num;
        out.attributes["video_sar_den"] = stream->sample_aspect_ratio.den;
    }
 
    AVDictionaryEntry* tag = nullptr;
    while ((tag = av_dict_get(stream->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
        out.attributes[std::string("video_stream_") + tag->key] = std::string(tag->value);
}

References MayaFlux::IO::FileMetadata::attributes, codec_context, frame_rate, MayaFlux::IO::FFmpegDemuxContext::get_stream(), height, stream_index, total_frames, and width.

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