diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/macosx/SDL_coreaudio.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/macosx/SDL_coreaudio.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/macosx/SDL_coreaudio.c b/distrib/sdl-1.2.15/src/audio/macosx/SDL_coreaudio.c new file mode 100644 index 0000000..31316d1 --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/macosx/SDL_coreaudio.c @@ -0,0 +1,291 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +#include <CoreAudio/CoreAudio.h> +#include <CoreServices/CoreServices.h> +#include <AudioUnit/AudioUnit.h> +#if MAC_OS_X_VERSION_MAX_ALLOWED <= 1050 +#include <AudioUnit/AUNTComponent.h> +#endif + +#include "SDL_audio.h" +#include "../SDL_audio_c.h" +#include "../SDL_sysaudio.h" +#include "SDL_coreaudio.h" + + +/* Audio driver functions */ + +static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec); +static void Core_WaitAudio(_THIS); +static void Core_PlayAudio(_THIS); +static Uint8 *Core_GetAudioBuf(_THIS); +static void Core_CloseAudio(_THIS); + +/* Audio driver bootstrap functions */ + +static int Audio_Available(void) +{ + return(1); +} + +static void Audio_DeleteDevice(SDL_AudioDevice *device) +{ + SDL_free(device->hidden); + SDL_free(device); +} + +static SDL_AudioDevice *Audio_CreateDevice(int devindex) +{ + SDL_AudioDevice *this; + + /* Initialize all variables that we clean on shutdown */ + this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); + if ( this ) { + SDL_memset(this, 0, (sizeof *this)); + this->hidden = (struct SDL_PrivateAudioData *) + SDL_malloc((sizeof *this->hidden)); + } + if ( (this == NULL) || (this->hidden == NULL) ) { + SDL_OutOfMemory(); + if ( this ) { + SDL_free(this); + } + return(0); + } + SDL_memset(this->hidden, 0, (sizeof *this->hidden)); + + /* Set the function pointers */ + this->OpenAudio = Core_OpenAudio; + this->WaitAudio = Core_WaitAudio; + this->PlayAudio = Core_PlayAudio; + this->GetAudioBuf = Core_GetAudioBuf; + this->CloseAudio = Core_CloseAudio; + + this->free = Audio_DeleteDevice; + + return this; +} + +AudioBootStrap COREAUDIO_bootstrap = { + "coreaudio", "Mac OS X CoreAudio", + Audio_Available, Audio_CreateDevice +}; + +/* The CoreAudio callback */ +static OSStatus audioCallback (void *inRefCon, + AudioUnitRenderActionFlags *ioActionFlags, + const AudioTimeStamp *inTimeStamp, + UInt32 inBusNumber, + UInt32 inNumberFrames, + AudioBufferList *ioData) +{ + SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon; + UInt32 remaining, len; + AudioBuffer *abuf; + void *ptr; + UInt32 i; + + /* Only do anything if audio is enabled and not paused */ + if ( ! this->enabled || this->paused ) { + for (i = 0; i < ioData->mNumberBuffers; i++) { + abuf = &ioData->mBuffers[i]; + SDL_memset(abuf->mData, this->spec.silence, abuf->mDataByteSize); + } + return 0; + } + + /* No SDL conversion should be needed here, ever, since we accept + any input format in OpenAudio, and leave the conversion to CoreAudio. + */ + /* + assert(!this->convert.needed); + assert(this->spec.channels == ioData->mNumberChannels); + */ + + for (i = 0; i < ioData->mNumberBuffers; i++) { + abuf = &ioData->mBuffers[i]; + remaining = abuf->mDataByteSize; + ptr = abuf->mData; + while (remaining > 0) { + if (bufferOffset >= bufferSize) { + /* Generate the data */ + SDL_memset(buffer, this->spec.silence, bufferSize); + SDL_mutexP(this->mixer_lock); + (*this->spec.callback)(this->spec.userdata, + buffer, bufferSize); + SDL_mutexV(this->mixer_lock); + bufferOffset = 0; + } + + len = bufferSize - bufferOffset; + if (len > remaining) + len = remaining; + SDL_memcpy(ptr, (char *)buffer + bufferOffset, len); + ptr = (char *)ptr + len; + remaining -= len; + bufferOffset += len; + } + } + + return 0; +} + +/* Dummy functions -- we don't use thread-based audio */ +void Core_WaitAudio(_THIS) +{ + return; +} + +void Core_PlayAudio(_THIS) +{ + return; +} + +Uint8 *Core_GetAudioBuf(_THIS) +{ + return(NULL); +} + +void Core_CloseAudio(_THIS) +{ + OSStatus result; + struct AURenderCallbackStruct callback; + + /* stop processing the audio unit */ + result = AudioOutputUnitStop (outputAudioUnit); + if (result != noErr) { + SDL_SetError("Core_CloseAudio: AudioOutputUnitStop"); + return; + } + + /* Remove the input callback */ + callback.inputProc = 0; + callback.inputProcRefCon = 0; + result = AudioUnitSetProperty (outputAudioUnit, + kAudioUnitProperty_SetRenderCallback, + kAudioUnitScope_Input, + 0, + &callback, + sizeof(callback)); + if (result != noErr) { + SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)"); + return; + } + + result = CloseComponent(outputAudioUnit); + if (result != noErr) { + SDL_SetError("Core_CloseAudio: CloseComponent"); + return; + } + + SDL_free(buffer); +} + +#define CHECK_RESULT(msg) \ + if (result != noErr) { \ + SDL_SetError("Failed to start CoreAudio: " msg); \ + return -1; \ + } + + +int Core_OpenAudio(_THIS, SDL_AudioSpec *spec) +{ + OSStatus result = noErr; + Component comp; + ComponentDescription desc; + struct AURenderCallbackStruct callback; + AudioStreamBasicDescription requestedDesc; + + /* Setup a AudioStreamBasicDescription with the requested format */ + requestedDesc.mFormatID = kAudioFormatLinearPCM; + requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked; + requestedDesc.mChannelsPerFrame = spec->channels; + requestedDesc.mSampleRate = spec->freq; + + requestedDesc.mBitsPerChannel = spec->format & 0xFF; + if (spec->format & 0x8000) + requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger; + if (spec->format & 0x1000) + requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian; + + requestedDesc.mFramesPerPacket = 1; + requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8; + requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket; + + + /* Locate the default output audio unit */ + desc.componentType = kAudioUnitType_Output; + desc.componentSubType = kAudioUnitSubType_DefaultOutput; + desc.componentManufacturer = kAudioUnitManufacturer_Apple; + desc.componentFlags = 0; + desc.componentFlagsMask = 0; + + comp = FindNextComponent (NULL, &desc); + if (comp == NULL) { + SDL_SetError ("Failed to start CoreAudio: FindNextComponent returned NULL"); + return -1; + } + + /* Open & initialize the default output audio unit */ + result = OpenAComponent (comp, &outputAudioUnit); + CHECK_RESULT("OpenAComponent") + + result = AudioUnitInitialize (outputAudioUnit); + CHECK_RESULT("AudioUnitInitialize") + + /* Set the input format of the audio unit. */ + result = AudioUnitSetProperty (outputAudioUnit, + kAudioUnitProperty_StreamFormat, + kAudioUnitScope_Input, + 0, + &requestedDesc, + sizeof (requestedDesc)); + CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)") + + /* Set the audio callback */ + callback.inputProc = audioCallback; + callback.inputProcRefCon = this; + result = AudioUnitSetProperty (outputAudioUnit, + kAudioUnitProperty_SetRenderCallback, + kAudioUnitScope_Input, + 0, + &callback, + sizeof(callback)); + CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)") + + /* Calculate the final parameters for this audio specification */ + SDL_CalculateAudioSpec(spec); + + /* Allocate a sample buffer */ + bufferOffset = bufferSize = this->spec.size; + buffer = SDL_malloc(bufferSize); + + /* Finally, start processing of the audio unit */ + result = AudioOutputUnitStart (outputAudioUnit); + CHECK_RESULT("AudioOutputUnitStart") + + + /* We're running! */ + return(1); +} |