float AEDeviceEnumerationOSX::ScoreFormat(const AudioStreamBasicDescription &formatDesc, const AEAudioFormat &format) const
{
float score = 0;
if (format.m_dataFormat == AE_FMT_AC3 ||
format.m_dataFormat == AE_FMT_DTS)
{
if (formatDesc.mFormatID == kAudioFormat60958AC3 ||
formatDesc.mFormatID == 'IAC3' ||
formatDesc.mFormatID == kAudioFormatAC3)
{
if (formatDesc.mSampleRate == format.m_sampleRate &&
formatDesc.mBitsPerChannel == CAEUtil::DataFormatToBits(format.m_dataFormat) &&
formatDesc.mChannelsPerFrame == format.m_channelLayout.Count())
{
// perfect match
score = FLT_MAX;
}
}
}
if (format.m_dataFormat == AE_FMT_AC3 ||
format.m_dataFormat == AE_FMT_DTS ||
format.m_dataFormat == AE_FMT_EAC3)
{ // we should be able to bistreaming in PCM if the samplerate, bitdepth and channels match
if (formatDesc.mSampleRate == format.m_sampleRate &&
formatDesc.mBitsPerChannel == CAEUtil::DataFormatToBits(format.m_dataFormat) &&
formatDesc.mChannelsPerFrame == format.m_channelLayout.Count() &&
formatDesc.mFormatID == kAudioFormatLinearPCM)
{
score = FLT_MAX / 2;
}
}
else
{ // non-passthrough, whatever works is fine
if (formatDesc.mFormatID == kAudioFormatLinearPCM)
{
score += scoreSampleRate(formatDesc.mSampleRate, format.m_sampleRate);
if (formatDesc.mChannelsPerFrame == format.m_channelLayout.Count())
score += 5;
else if (formatDesc.mChannelsPerFrame > format.m_channelLayout.Count())
score += 1;
if (format.m_dataFormat == AE_FMT_FLOAT || format.m_dataFormat == AE_FMT_FLOATP)
{ // for float, prefer the highest bitdepth we have
if (formatDesc.mBitsPerChannel >= 16)
score += (formatDesc.mBitsPerChannel / 8);
}
else
{
if (formatDesc.mBitsPerChannel == CAEUtil::DataFormatToBits(format.m_dataFormat))
score += 5;
else if (formatDesc.mBitsPerChannel == CAEUtil::DataFormatToBits(format.m_dataFormat))
score += 1;
}
}
}
return score;
}
float AEDeviceEnumerationOSX::ScoreFormat(const AudioStreamBasicDescription &formatDesc, const AEAudioFormat &format) const
{
float score = 0;
if (format.m_streamInfo.m_type != CAEStreamInfo::STREAM_TYPE_NULL)
{
if (formatDesc.mBitsPerChannel != 16)
return score;
if (formatDesc.mSampleRate != format.m_sampleRate)
return score;
if (formatDesc.mChannelsPerFrame != format.m_channelLayout.Count())
return score;
score += 5;
if (formatDesc.mFormatID == kAudioFormat60958AC3 ||
formatDesc.mFormatID == 'IAC3' ||
formatDesc.mFormatID == kAudioFormatAC3)
{
score += 1;
}
}
// non-passthrough, whatever works is fine
else if (formatDesc.mFormatID == kAudioFormatLinearPCM)
{
score += scoreSampleRate(formatDesc.mSampleRate, format.m_sampleRate);
if (formatDesc.mChannelsPerFrame == format.m_channelLayout.Count())
score += 5;
else if (formatDesc.mChannelsPerFrame > format.m_channelLayout.Count())
score += 1;
if (format.m_dataFormat == AE_FMT_FLOAT || format.m_dataFormat == AE_FMT_FLOATP)
{ // for float, prefer the highest bitdepth we have
if (formatDesc.mBitsPerChannel >= 16)
score += (formatDesc.mBitsPerChannel / 8);
}
else
{
if (formatDesc.mBitsPerChannel == CAEUtil::DataFormatToBits(format.m_dataFormat))
score += 5;
else if (formatDesc.mBitsPerChannel == CAEUtil::DataFormatToBits(format.m_dataFormat))
score += 1;
}
}
return score;
}
