extract_stream_metadata()

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

Populate stream-specific fields into an existing FileMetadata.

Appends codec name, channel layout, bit_rate, sample_rate, etc.

Parameters

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

Definition at line 179 of file AudioStreamContext.cpp.

{
    if (!codec_context || stream_index < 0)
        return;
 
    out.attributes["codec"] = std::string(avcodec_get_name(codec_context->codec_id));
    out.attributes["codec_long_name"] = std::string(codec_context->codec->long_name);
    out.attributes["total_frames"] = total_frames;
    out.attributes["sample_rate"] = sample_rate;
    out.attributes["channels"] = channels;
    out.attributes["bit_rate"] = codec_context->bit_rate;
 
    char layout_desc[256] = {};
    av_channel_layout_describe(&codec_context->ch_layout, layout_desc, sizeof(layout_desc));
    out.attributes["channel_layout"] = std::string(layout_desc);
 
    AVStream* stream = demux.get_stream(stream_index);
    if (!stream)
        return;
 
    AVDictionaryEntry* tag = nullptr;
    while ((tag = av_dict_get(stream->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
        out.attributes[std::string("stream_") + tag->key] = std::string(tag->value);
}

References MayaFlux::IO::FileMetadata::attributes, channels, codec_context, MayaFlux::IO::FFmpegDemuxContext::get_stream(), sample_rate, stream_index, and total_frames.

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