src/audio/macosx/SDL_coreaudio.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 28 May 2006 13:04:16 +0000
branchSDL-1.3
changeset 1662 782fd950bd46
parent 1487 dc6b59e925a2
child 1668 4da1ee79c9af
permissions -rw-r--r--
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
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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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   117
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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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   122
            /* 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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   129
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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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   143
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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   148
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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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   154
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   155
Uint8 *
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   156
Core_GetAudioBuf (_THIS)
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{
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    return (NULL);
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   159
}
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   160
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   161
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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   166
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    /* stop processing the audio unit */
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    result = AudioOutputUnitStop (outputAudioUnit);
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   169
    if (result != noErr) {
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        SDL_SetError ("Core_CloseAudio: AudioOutputUnitStop");
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   171
        return;
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    }
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   173
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   174
    /* Remove the input callback */
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   175
    callback.inputProc = 0;
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   176
    callback.inputProcRefCon = 0;
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    result = AudioUnitSetProperty (outputAudioUnit,
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                                   kAudioUnitProperty_SetInputCallback,
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   179
                                   kAudioUnitScope_Input,
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                                   0, &callback, sizeof (callback));
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   181
    if (result != noErr) {
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        SDL_SetError
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   183
            ("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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   184
        return;
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   185
    }
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diff changeset
   186
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   187
    result = CloseComponent (outputAudioUnit);
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   188
    if (result != noErr) {
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   189
        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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   193
    SDL_free (buffer);
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   194
}
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   195
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   196
#define CHECK_RESULT(msg) \
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   197
    if (result != noErr) { \
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   198
        SDL_SetError("Failed to start CoreAudio: " msg); \
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   199
        return -1; \
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diff changeset
   200
    }
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   201
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diff changeset
   202
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   203
int
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   204
Core_OpenAudio (_THIS, SDL_AudioSpec * spec)
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   205
{
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   206
    OSStatus result = noErr;
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   207
    Component comp;
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   208
    ComponentDescription desc;
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   209
    struct AudioUnitInputCallback callback;
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   210
    AudioStreamBasicDescription requestedDesc;
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   211
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   212
    /* Setup a AudioStreamBasicDescription with the requested format */
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   213
    requestedDesc.mFormatID = kAudioFormatLinearPCM;
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   214
    requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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   215
    requestedDesc.mChannelsPerFrame = spec->channels;
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   216
    requestedDesc.mSampleRate = spec->freq;
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   217
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   218
    requestedDesc.mBitsPerChannel = spec->format & 0xFF;
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   219
    if (spec->format & 0x8000)
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   220
        requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
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   221
    if (spec->format & 0x1000)
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diff changeset
   222
        requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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diff changeset
   223
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   224
    requestedDesc.mFramesPerPacket = 1;
1662
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   225
    requestedDesc.mBytesPerFrame =
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   226
        requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
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   227
    requestedDesc.mBytesPerPacket =
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   228
        requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
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   229
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   230
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   231
    /* Locate the default output audio unit */
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diff changeset
   232
    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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                                       &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, &callback, sizeof (callback));
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    CHECK_RESULT
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        ("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: */