AEDataFormatList AEDeviceEnumerationOSX::caFormatToAE(const AudioStreamBasicDescription &formatDesc, bool isDigital) const
{
AEDataFormatList formatList;
// add stream format info
switch (formatDesc.mFormatID)
{
case kAudioFormatAC3:
case kAudioFormat60958AC3:
formatList.push_back(AE_FMT_AC3);
formatList.push_back(AE_FMT_DTS);
break;
default:
switch(formatDesc.mBitsPerChannel)
{
case 16:
if (formatDesc.mFormatFlags & kAudioFormatFlagIsBigEndian)
formatList.push_back(AE_FMT_S16BE);
else
{
/* Passthrough is possible with a 2ch digital output */
if (formatDesc.mChannelsPerFrame == 2 && isDigital)
{
if (formatDesc.mSampleRate == 48000)
{
formatList.push_back(AE_FMT_AC3);
formatList.push_back(AE_FMT_DTS);
}
else if (formatDesc.mSampleRate == 192000)
{
formatList.push_back(AE_FMT_EAC3);
}
}
formatList.push_back(AE_FMT_S16LE);
}
break;
case 24:
if (formatDesc.mFormatFlags & kAudioFormatFlagIsBigEndian)
formatList.push_back(AE_FMT_S24BE3);
else
formatList.push_back(AE_FMT_S24LE3);
break;
case 32:
if (formatDesc.mFormatFlags & kAudioFormatFlagIsFloat)
formatList.push_back(AE_FMT_FLOAT);
else
{
if (formatDesc.mFormatFlags & kAudioFormatFlagIsBigEndian)
formatList.push_back(AE_FMT_S32BE);
else
formatList.push_back(AE_FMT_S32LE);
}
break;
}
break;
}
return formatList;
}
AEDataFormatList AEDeviceEnumerationOSX::caFormatToAE(const AudioStreamBasicDescription &formatDesc, bool isDigital) const
{
AEDataFormatList formatList;
// add stream format info
switch (formatDesc.mFormatID)
{
case kAudioFormatAC3:
case kAudioFormat60958AC3:
break;
default:
switch(formatDesc.mBitsPerChannel)
{
case 16:
if (formatDesc.mFormatFlags & kAudioFormatFlagIsBigEndian)
{
formatList.push_back(AE_FMT_S16BE);
}
else
{
formatList.push_back(AE_FMT_S16LE);
}
formatList.push_back(AE_FMT_S16NE); // if we support either LE or BE - we always support NE too...
break;
case 24:
if (formatDesc.mFormatFlags & kAudioFormatFlagIsBigEndian)
{
formatList.push_back(AE_FMT_S24BE3);
}
else
{
formatList.push_back(AE_FMT_S24LE3);
}
formatList.push_back(AE_FMT_S24NE3); // if we support either LE or BE - we always support NE too...
break;
case 32:
if (formatDesc.mFormatFlags & kAudioFormatFlagIsFloat)
{
formatList.push_back(AE_FMT_FLOAT);
}
else
{
if (formatDesc.mFormatFlags & kAudioFormatFlagIsBigEndian)
{
formatList.push_back(AE_FMT_S32BE);
}
else
{
formatList.push_back(AE_FMT_S32LE);
}
formatList.push_back(AE_FMT_S32NE); // if we support either LE or BE - we always support NE too...
}
break;
}
break;
}
return formatList;
}
AEDataFormatList AEDeviceEnumerationOSX::getFormatListForStream(UInt32 streamIdx) const
{
AEDataFormatList returnDataFormatList;
if (streamIdx >= m_caStreamInfos.size())
return returnDataFormatList;
// check the streams
const StreamFormatList &formatList = m_caStreamInfos[streamIdx].formatList;
for(UInt32 formatIdx = 0; formatIdx < formatList.size(); formatIdx++)
{
AudioStreamBasicDescription formatDesc = formatList[formatIdx].mFormat;
AEDataFormatList aeFormatList = caFormatToAE(formatDesc, m_caStreamInfos[streamIdx].isDigital);
for (UInt32 formatListIdx = 0; formatListIdx < aeFormatList.size(); formatListIdx++)
{
if (!hasDataFormat(returnDataFormatList, aeFormatList[formatListIdx]))
returnDataFormatList.push_back(aeFormatList[formatListIdx]);
}
}
return returnDataFormatList;
}