C++ (Cpp) convert_ca_speaker_layout Examples

Example #1

File: mac-audio.c Project: rtjason/obs-studio

static bool coreaudio_init_format(struct coreaudio_data *ca)
{
	AudioStreamBasicDescription desc;
	OSStatus stat;
	UInt32 size = sizeof(desc);

	stat = get_property(ca->unit, kAudioUnitProperty_StreamFormat,
			SCOPE_INPUT, BUS_INPUT, &desc, &size);
	if (!ca_success(stat, ca, "coreaudio_init_format", "get input format"))
		return false;

	/* Certain types of devices have no limit on channel count, and
	 * there's no way to know the actual number of channels it's using,
	 * so if we encounter this situation just force to stereo */
        if (desc.mChannelsPerFrame > 8) {
                desc.mChannelsPerFrame = 2;
                desc.mBytesPerFrame = 2 * desc.mBitsPerChannel / 8;
                desc.mBytesPerPacket =
                        desc.mFramesPerPacket * desc.mBytesPerFrame;
        }

	stat = set_property(ca->unit, kAudioUnitProperty_StreamFormat,
			SCOPE_OUTPUT, BUS_INPUT, &desc, size);
	if (!ca_success(stat, ca, "coreaudio_init_format", "set output format"))
		return false;

	if (desc.mFormatID != kAudioFormatLinearPCM) {
		ca_warn(ca, "coreaudio_init_format", "format is not PCM");
		return false;
	}

	ca->format = convert_ca_format(desc.mFormatFlags, desc.mBitsPerChannel);
	if (ca->format == AUDIO_FORMAT_UNKNOWN) {
		ca_warn(ca, "coreaudio_init_format", "unknown format flags: "
				"%u, bits: %u",
				(unsigned int)desc.mFormatFlags,
				(unsigned int)desc.mBitsPerChannel);
		return false;
	}

	ca->sample_rate = (uint32_t)desc.mSampleRate;
	ca->speakers = convert_ca_speaker_layout(desc.mChannelsPerFrame);

	if (ca->speakers == SPEAKERS_UNKNOWN) {
		ca_warn(ca, "coreaudio_init_format", "unknown speaker layout: "
				"%u channels",
				(unsigned int)desc.mChannelsPerFrame);
		return false;
	}

	return true;
}

Example #2

File: mac-audio.c Project: CuylarStudios/obs-studio

static bool coreaudio_init_format(struct coreaudio_data *ca)
{
	AudioStreamBasicDescription desc;
	OSStatus stat;
	UInt32 size = sizeof(desc);

	stat = get_property(ca->unit, kAudioUnitProperty_StreamFormat,
			SCOPE_INPUT, BUS_INPUT, &desc, &size);
	if (!ca_success(stat, ca, "coreaudio_init_format", "get input format"))
		return false;

	stat = set_property(ca->unit, kAudioUnitProperty_StreamFormat,
			SCOPE_OUTPUT, BUS_INPUT, &desc, size);
	if (!ca_success(stat, ca, "coreaudio_init_format", "set output format"))
		return false;

	if (desc.mFormatID != kAudioFormatLinearPCM) {
		ca_warn(ca, "coreaudio_init_format", "format is not PCM");
		return false;
	}

	ca->format = convert_ca_format(desc.mFormatFlags, desc.mBitsPerChannel);
	if (ca->format == AUDIO_FORMAT_UNKNOWN) {
		ca_warn(ca, "coreaudio_init_format", "unknown format flags: "
				"%u, bits: %u",
				(unsigned int)desc.mFormatFlags,
				(unsigned int)desc.mBitsPerChannel);
		return false;
	}

	ca->sample_rate = (uint32_t)desc.mSampleRate;
	ca->speakers = convert_ca_speaker_layout(desc.mChannelsPerFrame);

	if (ca->speakers == SPEAKERS_UNKNOWN) {
		ca_warn(ca, "coreaudio_init_format", "unknown speaker layout: "
				"%u channels",
				(unsigned int)desc.mChannelsPerFrame);
		return false;
	}

	return true;
}