pandory500/SDL-mirror
2
0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Mac OS X audio backend now supports int32/float32.

Browse source 
--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402050
This commit is contained in:
Ryan C. Gordon 2006-09-01 05:31:36 +00:00
parent 3e4e137122
commit 28f57c5b3a
1 changed files with 47 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

63
src/audio/macosx/SDL_coreaudio.c
View file

@ -207,25 +207,56 @@ Core_OpenAudio(_THIS, SDL_AudioSpec * spec)
Component comp;
ComponentDescription desc;
struct AudioUnitInputCallback callback;
AudioStreamBasicDescription requestedDesc;
AudioStreamBasicDescription desc;
SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
int valid_datatype = 0;
/* Setup a AudioStreamBasicDescription with the requested format */
requestedDesc.mFormatID = kAudioFormatLinearPCM;
requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
requestedDesc.mChannelsPerFrame = spec->channels;
requestedDesc.mSampleRate = spec->freq;
memset(&desc, '\0', sizeof (AudioStreamBasicDescription));
desc.mFormatID = kAudioFormatLinearPCM;
desc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
desc.mChannelsPerFrame = spec->channels;
desc.mSampleRate = spec->freq;
desc.mFramesPerPacket = 1;
requestedDesc.mBitsPerChannel = spec->format & 0xFF;
if (spec->format & 0x8000)
requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
if (spec->format & 0x1000)
requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
while ((!valid_datatype) && (test_format)) {
spec->format = test_format;
desc.mFormatFlags = 0;
/* Just a list of valid SDL formats, so people don't pass junk here. */
switch (test_format) {
case AUDIO_U8:
case AUDIO_S8:
case AUDIO_U16LSB:
case AUDIO_S16LSB:
case AUDIO_U16MSB:
case AUDIO_S16MSB:
case AUDIO_S32LSB:
case AUDIO_S32MSB:
case AUDIO_F32LSB:
case AUDIO_F32MSB:
valid_datatype = 1;
desc.mBitsPerChannel = SDL_AUDIO_BITSIZE(spec->format);
requestedDesc.mFramesPerPacket = 1;
requestedDesc.mBytesPerFrame =
requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
requestedDesc.mBytesPerPacket =
requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
if (SDL_AUDIO_ISFLOAT(spec->format))
desc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
else if (SDL_AUDIO_ISSIGNED(spec->format))
desc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
if (SDL_AUDIO_ISBIGENDIAN(spec->format))
desc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
break;
}
}
if (!valid_datatype) { /* shouldn't happen, but just in case... */
SDL_SetError("Unsupported audio format");
return (-1);
}
desc.mBytesPerFrame =
desc.mBitsPerChannel * desc.mChannelsPerFrame / 8;
desc.mBytesPerPacket =
desc.mBytesPerFrame * desc.mFramesPerPacket;
/* Locate the default output audio unit */
@ -252,7 +283,7 @@ Core_OpenAudio(_THIS, SDL_AudioSpec * spec)
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
0,
&requestedDesc, sizeof(requestedDesc));
&desc, sizeof (desc));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
/* Set the audio callback */
callback.inputProc = audioCallback;