Method LoadOggFile

Engine/source/EtFramework/Audio/AudioData.cpp:206–256

--------------------------------- AudioAsset::LoadOggFile Read a OGG Vorbis file from binary data using STB Vorbis

// Read a OGG Vorbis file from binary data using STB Vorbis
//
bool AudioAsset::LoadOggFile(AudioBufferData &bufferData, std::vector<uint8> const& binaryContent)
{
	int e = 0;
	stb_vorbis* vorbis = stb_vorbis_open_memory(binaryContent.data(), (int)binaryContent.size(), &e, NULL);
	if (!vorbis) return false;
	if (e)
	{
		stb_vorbis_get_error(vorbis);
		stb_vorbis_close(vorbis);
		return false;
	}

	stb_vorbis_info info = stb_vorbis_get_info(vorbis);

	switch (info.channels)
	{
	case 1:bufferData.format = AL_FORMAT_MONO16; break;
	case 2:bufferData.format = AL_FORMAT_STEREO16; break;
	default:
		LOG(std::string("Only mono and stereo supported by openAL, numChannels: ") + std::to_string(info.channels), core::LogLevel::Warning);
		stb_vorbis_close(vorbis);
		return false;
	}

	int32 samples = stb_vorbis_stream_length_in_samples(vorbis);
	const int32 bufferSize = samples * info.channels;

	ALshort* pcm = new ALshort[bufferSize];
	int32  size = 0;
	int32  result = 0;

	while (size < bufferSize)
	{
		result = stb_vorbis_get_samples_short_interleaved(vorbis, info.channels, pcm + size, bufferSize - size);
		if (result > 0) size += result * info.channels;
		else break;
	}
	if (size == 0)
	{
		stb_vorbis_close(vorbis);
		return false;
	}

	bufferData.data = pcm;
	bufferData.size = size * sizeof(ALshort);
	bufferData.frequency = info.sample_rate;

	stb_vorbis_close(vorbis);

	return true;
}

//---------------------------------
// AudioAsset::ConvertToMono