src/audio/macosx/SDL_coreaudio.c
author Ryan C. Gordon <icculus@icculus.org>
Sat, 02 Sep 2006 21:50:04 +0000
changeset 2017 df06e6eb65c6
parent 2016 72fa74928062
child 2043 adf732f1f016
permissions -rw-r--r--
Fixed macosx audio initialization (passed wrong struct to CoreAudio).
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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 "SDL_config.h"
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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
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Audio_Available(void)
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{
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    return (1);
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}
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static void
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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 *
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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
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audioCallback(void *inRefCon,
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              AudioUnitRenderActionFlags inActionFlags,
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              const AudioTimeStamp * inTimeStamp,
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              UInt32 inBusNumber, 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, 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, (char *) buffer + bufferOffset, len);
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        ptr = (char *) ptr + len;
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        remaining -= len;
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        bufferOffset += len;
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   137
    }
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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
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Core_WaitAudio(_THIS)
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{
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    return;
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}
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void
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Core_PlayAudio(_THIS)
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{
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    return;
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}
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Uint8 *
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Core_GetAudioBuf(_THIS)
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{
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    return (NULL);
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}
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void
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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, &callback, sizeof(callback));
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    if (result != noErr) {
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        SDL_SetError
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            ("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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        return;
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   185
    }
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    result = CloseComponent(outputAudioUnit);
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   188
    if (result != noErr) {
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        SDL_SetError("Core_CloseAudio: CloseComponent");
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   190
        return;
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   191
    }
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   192
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    SDL_free(buffer);
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}
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#define CHECK_RESULT(msg) \
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   197
    if (result != noErr) { \
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   198
        SDL_SetError("CoreAudio error (%s): %d", msg, (int) result); \
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        return -1; \
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   200
    }
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   202
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int
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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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    AudioStreamBasicDescription strdesc;
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    SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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    int valid_datatype = 0;
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    /* Setup a AudioStreamBasicDescription with the requested format */
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    memset(&strdesc, '\0', sizeof (AudioStreamBasicDescription));
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    strdesc.mFormatID = kAudioFormatLinearPCM;
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    strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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    strdesc.mChannelsPerFrame = spec->channels;
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    strdesc.mSampleRate = spec->freq;
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    strdesc.mFramesPerPacket = 1;
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   221
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   222
    while ((!valid_datatype) && (test_format)) {
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        spec->format = test_format;
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   224
        /* Just a list of valid SDL formats, so people don't pass junk here. */
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        switch (test_format) {
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   226
            case AUDIO_U8:
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            case AUDIO_S8:
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            case AUDIO_U16LSB:
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            case AUDIO_S16LSB:
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            case AUDIO_U16MSB:
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   231
            case AUDIO_S16MSB:
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   232
            case AUDIO_S32LSB:
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   233
            case AUDIO_S32MSB:
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   234
            case AUDIO_F32LSB:
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            case AUDIO_F32MSB:
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                valid_datatype = 1;
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                strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(spec->format);
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   238
                if (SDL_AUDIO_ISBIGENDIAN(spec->format))
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   239
                    strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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   240
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   241
                if (SDL_AUDIO_ISFLOAT(spec->format))
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   242
                    strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
2003
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   243
                else if (SDL_AUDIO_ISSIGNED(spec->format))
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                    strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
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                break;
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        }
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    }
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    if (!valid_datatype) {  /* shouldn't happen, but just in case... */
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        SDL_SetError("Unsupported audio format");
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        return (-1);
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    }
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2016
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    strdesc.mBytesPerFrame =
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        strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
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    strdesc.mBytesPerPacket =
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        strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
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    /* Locate the default output audio unit */
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    memset(&desc, '\0', sizeof (ComponentDescription));
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    desc.componentType = kAudioUnitComponentType;
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    desc.componentSubType = kAudioUnitSubType_Output;
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    desc.componentManufacturer = kAudioUnitID_DefaultOutput;
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    desc.componentFlags = 0;
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    desc.componentFlagsMask = 0;
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    comp = FindNextComponent(NULL, &desc);
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    if (comp == NULL) {
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        SDL_SetError
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            ("Failed to start CoreAudio: FindNextComponent returned NULL");
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        return -1;
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    }
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    /* Open & initialize the default output audio unit */
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    result = OpenAComponent(comp, &outputAudioUnit);
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    CHECK_RESULT("OpenAComponent")
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        result = AudioUnitInitialize(outputAudioUnit);
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    CHECK_RESULT("AudioUnitInitialize")
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        /* Set the input format of the audio unit. */
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        result = AudioUnitSetProperty(outputAudioUnit,
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                                      kAudioUnitProperty_StreamFormat,
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                                      kAudioUnitScope_Input,
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                                      0,
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                                      &strdesc, sizeof (strdesc));
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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, &callback, 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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    /* 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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}
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/* vi: set ts=4 sw=4 expandtab: */