src/audio/macosx/SDL_coreaudio.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 16 Feb 2006 10:11:48 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include <AudioUnit/AudioUnit.h>
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "../SDL_sysaudio.h"
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#include "SDL_coreaudio.h"
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/* Audio driver functions */
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static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void Core_WaitAudio(_THIS);
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static void Core_PlayAudio(_THIS);
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static Uint8 *Core_GetAudioBuf(_THIS);
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static void Core_CloseAudio(_THIS);
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/* Audio driver bootstrap functions */
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static int Audio_Available(void)
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{
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    return(1);
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}
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static void Audio_DeleteDevice(SDL_AudioDevice *device)
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{
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    SDL_free(device->hidden);
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    SDL_free(device);
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}
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static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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{
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    SDL_AudioDevice *this;
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    /* Initialize all variables that we clean on shutdown */
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    this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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    if ( this ) {
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        SDL_memset(this, 0, (sizeof *this));
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        this->hidden = (struct SDL_PrivateAudioData *)
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                SDL_malloc((sizeof *this->hidden));
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    }
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    if ( (this == NULL) || (this->hidden == NULL) ) {
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        SDL_OutOfMemory();
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        if ( this ) {
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            SDL_free(this);
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        }
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        return(0);
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    }
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    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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    /* Set the function pointers */
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    this->OpenAudio = Core_OpenAudio;
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    this->WaitAudio = Core_WaitAudio;
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    this->PlayAudio = Core_PlayAudio;
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    this->GetAudioBuf = Core_GetAudioBuf;
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    this->CloseAudio = Core_CloseAudio;
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    this->free = Audio_DeleteDevice;
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    return this;
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}
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AudioBootStrap COREAUDIO_bootstrap = {
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    "coreaudio", "Mac OS X CoreAudio",
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    Audio_Available, Audio_CreateDevice
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};
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/* The CoreAudio callback */
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static OSStatus     audioCallback (void                             *inRefCon, 
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                                    AudioUnitRenderActionFlags      inActionFlags,
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                                    const AudioTimeStamp            *inTimeStamp, 
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                                    UInt32                          inBusNumber, 
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                                    AudioBuffer                     *ioData)
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{
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    SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon;
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    UInt32 remaining, len;
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    void *ptr;
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    /* Only do anything if audio is enabled and not paused */
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    if ( ! this->enabled || this->paused ) {
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        SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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        return 0;
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    }
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    /* No SDL conversion should be needed here, ever, since we accept
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       any input format in OpenAudio, and leave the conversion to CoreAudio.
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     */
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    /*
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    assert(!this->convert.needed);
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    assert(this->spec.channels == ioData->mNumberChannels);
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     */
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    remaining = ioData->mDataByteSize;
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    ptr = ioData->mData;
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    while (remaining > 0) {
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        if (bufferOffset >= bufferSize) {
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            /* Generate the data */
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            SDL_memset(buffer, this->spec.silence, bufferSize);
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            SDL_mutexP(this->mixer_lock);
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            (*this->spec.callback)(this->spec.userdata,
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                        buffer, bufferSize);
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            SDL_mutexV(this->mixer_lock);
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            bufferOffset = 0;
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        }
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        len = bufferSize - bufferOffset;
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        if (len > remaining)
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            len = remaining;
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        SDL_memcpy(ptr, buffer + bufferOffset, len);
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        ptr += len;
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        remaining -= len;
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        bufferOffset += len;
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    }
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    return 0;
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}
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/* Dummy functions -- we don't use thread-based audio */
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void Core_WaitAudio(_THIS)
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{
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    return;
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}
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void Core_PlayAudio(_THIS)
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{
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    return;
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}
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Uint8 *Core_GetAudioBuf(_THIS)
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{
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    return(NULL);
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}
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void Core_CloseAudio(_THIS)
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{
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    OSStatus result;
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    struct AudioUnitInputCallback callback;
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    /* stop processing the audio unit */
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    result = AudioOutputUnitStop (outputAudioUnit);
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    if (result != noErr) {
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        SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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        return;
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    }
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    /* Remove the input callback */
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    callback.inputProc = 0;
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    callback.inputProcRefCon = 0;
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    result = AudioUnitSetProperty (outputAudioUnit, 
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                        kAudioUnitProperty_SetInputCallback, 
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                        kAudioUnitScope_Input, 
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                        0,
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                        &callback, 
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                        sizeof(callback));
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    if (result != noErr) {
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        SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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        return;
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    }
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    result = CloseComponent(outputAudioUnit);
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    if (result != noErr) {
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        SDL_SetError("Core_CloseAudio: CloseComponent");
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   184
        return;
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   185
    }
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   186
    
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    SDL_free(buffer);
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   188
}
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   189
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#define CHECK_RESULT(msg) \
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    if (result != noErr) { \
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        SDL_SetError("Failed to start CoreAudio: " msg); \
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        return -1; \
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   194
    }
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int Core_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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    OSStatus result = noErr;
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    Component comp;
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    ComponentDescription desc;
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    struct AudioUnitInputCallback callback;
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   203
    AudioStreamBasicDescription requestedDesc;
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   204
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   205
    /* Setup a AudioStreamBasicDescription with the requested format */
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   206
    requestedDesc.mFormatID = kAudioFormatLinearPCM;
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   207
    requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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   208
    requestedDesc.mChannelsPerFrame = spec->channels;
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   209
    requestedDesc.mSampleRate = spec->freq;
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   210
    
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   211
    requestedDesc.mBitsPerChannel = spec->format & 0xFF;
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   212
    if (spec->format & 0x8000)
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   213
        requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
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   214
    if (spec->format & 0x1000)
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   215
        requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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   216
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   217
    requestedDesc.mFramesPerPacket = 1;
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   218
    requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
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   219
    requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
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   220
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   221
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   222
    /* Locate the default output audio unit */
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   223
    desc.componentType = kAudioUnitComponentType;
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diff changeset
   224
    desc.componentSubType = kAudioUnitSubType_Output;
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diff changeset
   225
    desc.componentManufacturer = kAudioUnitID_DefaultOutput;
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   226
    desc.componentFlags = 0;
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   227
    desc.componentFlagsMask = 0;
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   228
    
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   229
    comp = FindNextComponent (NULL, &desc);
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   230
    if (comp == NULL) {
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diff changeset
   231
        SDL_SetError ("Failed to start CoreAudio: FindNextComponent returned NULL");
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   232
        return -1;
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diff changeset
   233
    }
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diff changeset
   234
    
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   235
    /* Open & initialize the default output audio unit */
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diff changeset
   236
    result = OpenAComponent (comp, &outputAudioUnit);
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diff changeset
   237
    CHECK_RESULT("OpenAComponent")
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diff changeset
   238
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   239
    result = AudioUnitInitialize (outputAudioUnit);
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diff changeset
   240
    CHECK_RESULT("AudioUnitInitialize")
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   241
                
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   242
    /* Set the input format of the audio unit. */
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diff changeset
   243
    result = AudioUnitSetProperty (outputAudioUnit,
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                               kAudioUnitProperty_StreamFormat,
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                               kAudioUnitScope_Input,
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                               0,
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                               &requestedDesc,
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                               sizeof (requestedDesc));
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    CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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    /* Set the audio callback */
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    callback.inputProc = audioCallback;
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    callback.inputProcRefCon = this;
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    result = AudioUnitSetProperty (outputAudioUnit, 
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                        kAudioUnitProperty_SetInputCallback, 
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                        kAudioUnitScope_Input, 
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                        0,
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                        &callback, 
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                        sizeof(callback));
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    CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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    /* Calculate the final parameters for this audio specification */
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    SDL_CalculateAudioSpec(spec);
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    /* Allocate a sample buffer */
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    bufferOffset = bufferSize = this->spec.size;
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    buffer = SDL_malloc(bufferSize);
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935
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    /* Finally, start processing of the audio unit */
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    result = AudioOutputUnitStart (outputAudioUnit);
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    CHECK_RESULT("AudioOutputUnitStart")    
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    /* We're running! */
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    return(1);
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}