Method UpdateAudioInfo

src/FFmpegReader.cpp:917–1029

}

void FFmpegReader::UpdateAudioInfo() {
	int codec_channels =
#if HAVE_CH_LAYOUT
		AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->ch_layout.nb_channels;
#else
		AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channels;
#endif

	// Set default audio channel layout (if needed)
#if HAVE_CH_LAYOUT
	AVChannelLayout audio_ch_layout = ffmpeg_get_valid_channel_layout(
		AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->ch_layout, codec_channels);
	if (audio_ch_layout.nb_channels > 0) {
		av_channel_layout_uninit(&(AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->ch_layout));
		av_channel_layout_copy(&(AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->ch_layout), &audio_ch_layout);
		codec_channels = audio_ch_layout.nb_channels;
	}
#else
	if (codec_channels > 0 && AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channel_layout == 0)
		AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channel_layout = av_get_default_channel_layout(AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channels);
#endif

	if (info.sample_rate > 0) {
		// Skip init - if info struct already populated
		return;
	}

	auto record_duration = [](double &target, double seconds) {
		if (seconds > 0.0)
			target = std::max(target, seconds);
	};

	// Set values of FileInfo struct
	info.has_audio = true;
	info.file_size = pFormatCtx->pb ? avio_size(pFormatCtx->pb) : -1;
	info.acodec = aCodecCtx->codec->name;
#if HAVE_CH_LAYOUT
	info.channels = audio_ch_layout.nb_channels;
	info.channel_layout = static_cast<ChannelLayout>(ffmpeg_channel_layout_mask(audio_ch_layout));
#else
	info.channels = AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channels;
	info.channel_layout = (ChannelLayout) AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channel_layout;
#endif

	// If channel layout is not set, guess based on the number of channels
	if (info.channel_layout == 0) {
		if (info.channels == 1) {
			info.channel_layout = openshot::LAYOUT_MONO;
		} else if (info.channels == 2) {
			info.channel_layout = openshot::LAYOUT_STEREO;
		}
	}

	info.sample_rate = AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->sample_rate;
	info.audio_bit_rate = AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->bit_rate;
	if (info.audio_bit_rate <= 0) {
		// Get bitrate from format
		info.audio_bit_rate = pFormatCtx->bit_rate;