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SDL_coreaudio.c
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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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
slouken@libsdl.org
*/
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#include "SDL_config.h"
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#include <CoreAudio/CoreAudio.h>
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#include <AudioUnit/AudioUnit.h>
#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
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#include "SDL_coreaudio.h"
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#define DEBUG_COREAUDIO 0
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typedef struct COREAUDIO_DeviceList
{
AudioDeviceID id;
const char *name;
} COREAUDIO_DeviceList;
static COREAUDIO_DeviceList *inputDevices = NULL;
static int inputDeviceCount = 0;
static COREAUDIO_DeviceList *outputDevices = NULL;
static int outputDeviceCount = 0;
static void
free_device_list(COREAUDIO_DeviceList **devices, int *devCount)
{
if (*devices) {
int i = *devCount;
while (i--)
SDL_free((void *) (*devices)[i].name);
SDL_free(*devices);
*devices = NULL;
}
*devCount = 0;
}
static void
build_device_list(int iscapture, COREAUDIO_DeviceList **devices, int *devCount)
{
Boolean outWritable = 0;
OSStatus result = noErr;
UInt32 size = 0;
AudioDeviceID *devs = NULL;
UInt32 i = 0;
UInt32 max = 0;
free_device_list(devices, devCount);
result = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices,
&size, &outWritable);
if (result != kAudioHardwareNoError)
return;
devs = (AudioDeviceID *) alloca(size);
if (devs == NULL)
return;
max = size / sizeof (AudioDeviceID);
*devices = (COREAUDIO_DeviceList *) SDL_malloc(max * sizeof (**devices));
if (*devices == NULL)
return;
result = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
&size, devs);
if (result != kAudioHardwareNoError)
return;
for (i = 0; i < max; i++) {
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CFStringRef cfstr = NULL;
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char *ptr = NULL;
AudioDeviceID dev = devs[i];
AudioBufferList *buflist = NULL;
int usable = 0;
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CFIndex len = 0;
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result = AudioDeviceGetPropertyInfo(dev, 0, iscapture,
kAudioDevicePropertyStreamConfiguration,
&size, &outWritable);
if (result != noErr)
continue;
buflist = (AudioBufferList *) SDL_malloc(size);
if (buflist == NULL)
continue;
result = AudioDeviceGetProperty(dev, 0, iscapture,
kAudioDevicePropertyStreamConfiguration,
&size, buflist);
if (result == noErr) {
UInt32 j;
for (j = 0; j < buflist->mNumberBuffers; j++) {
if (buflist->mBuffers[j].mNumberChannels > 0) {
usable = 1;
break;
}
}
}
SDL_free(buflist);
if (!usable)
continue;
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size = sizeof (CFStringRef);
result = AudioDeviceGetProperty(dev, 0, iscapture,
kAudioObjectPropertyName,
&size, &cfstr);
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if (result != kAudioHardwareNoError)
continue;
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len = CFStringGetMaximumSizeForEncoding(CFStringGetLength(cfstr),
kCFStringEncodingUTF8);
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ptr = (char *) SDL_malloc(len + 1);
usable = ( (ptr != NULL) &&
(CFStringGetCString(cfstr,ptr,len+1,kCFStringEncodingUTF8)) );
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CFRelease(cfstr);
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if (usable) {
len = strlen(ptr);
/* Some devices have whitespace at the end...trim it. */
while ((len > 0) && (ptr[len-1] == ' ')) {
len--;
}
usable = (len > 0);
}
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if (!usable) {
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SDL_free(ptr);
} else {
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ptr[len] = '\0';
#if DEBUG_COREAUDIO
printf("COREAUDIO: Found %s device #%d: '%s' (devid %d)\n",
((iscapture) ? "capture" : "output"),
(int) *devCount, ptr, (int) dev);
#endif
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(*devices)[*devCount].id = dev;
(*devices)[*devCount].name = ptr;
(*devCount)++;
}
}
}
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static inline void
build_device_lists(void)
{
build_device_list(0, &outputDevices, &outputDeviceCount);
build_device_list(1, &inputDevices, &inputDeviceCount);
}
static inline void
free_device_lists(void)
{
free_device_list(&outputDevices, &outputDeviceCount);
free_device_list(&inputDevices, &inputDeviceCount);
}
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static int
find_device_id(const char *devname, int iscapture, AudioDeviceID *id)
{
int i = ((iscapture) ? inputDeviceCount : outputDeviceCount);
COREAUDIO_DeviceList *devs = ((iscapture) ? inputDevices : outputDevices);
while (i--) {
if (SDL_strcmp(devname, devs->name) == 0) {
*id = devs->id;
return 1;
}
devs++;
}
return 0;
}
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static int
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COREAUDIO_Available(void)
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{
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return 1; /* always available on Mac OS X. */
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}
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static int
COREAUDIO_DetectDevices(int iscapture)
{
if (iscapture) {
build_device_list(1, &inputDevices, &inputDeviceCount);
return inputDeviceCount;
} else {
build_device_list(0, &outputDevices, &outputDeviceCount);
return outputDeviceCount;
}
return 0; /* shouldn't ever hit this. */
}
static const char *
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COREAUDIO_GetDeviceName(int index, int iscapture)
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{
if ((iscapture) && (index < inputDeviceCount)) {
return inputDevices[index].name;
} else if ((!iscapture) && (index < outputDeviceCount)) {
return outputDevices[index].name;
}
SDL_SetError("No such device");
return NULL;
}
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static void
COREAUDIO_Deinitialize(void)
{
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free_device_lists();
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}
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/* The CoreAudio callback */
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static OSStatus
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outputCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
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const AudioTimeStamp * inTimeStamp,
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UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *ioDataList)
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{
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SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
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AudioBuffer *ioData = &ioDataList->mBuffers[0];
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UInt32 remaining, len;
void *ptr;
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/* Is there ever more than one buffer, and what do you do with it? */
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if (ioDataList->mNumberBuffers != 1) {
return noErr;
}
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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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/* No SDL conversion should be needed here, ever, since we accept
any input format in OpenAudio, and leave the conversion to CoreAudio.
*/
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/*
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assert(!this->convert.needed);
assert(this->spec.channels == ioData->mNumberChannels);
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*/
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remaining = ioData->mDataByteSize;
ptr = ioData->mData;
while (remaining > 0) {
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if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
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/* Generate the data */
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SDL_memset(this->hidden->buffer, this->spec.silence,
this->hidden->bufferSize);
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SDL_mutexP(this->mixer_lock);
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(*this->spec.callback) (this->spec.userdata, this->hidden->buffer,
this->hidden->bufferSize);
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SDL_mutexV(this->mixer_lock);
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this->hidden->bufferOffset = 0;
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}
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len = this->hidden->bufferSize - this->hidden->bufferOffset;
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if (len > remaining)
len = remaining;
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SDL_memcpy(ptr,
(char *) this->hidden->buffer + this->hidden->bufferOffset,
len);
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ptr = (char *) ptr + len;
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remaining -= len;
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this->hidden->bufferOffset += len;
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}
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return 0;
}
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static OSStatus
inputCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *ioData)
{
//err = AudioUnitRender(afr->fAudioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, afr->fAudioBuffer);
// !!! FIXME: write me!
return noErr;
}
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static void
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COREAUDIO_CloseDevice(_THIS)
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{
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if (this->hidden != NULL) {
OSStatus result = noErr;
AURenderCallbackStruct callback;
const AudioUnitElement output_bus = 0;
const AudioUnitElement input_bus = 1;
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const int iscapture = this->iscapture;
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const AudioUnitElement bus = ((iscapture) ? input_bus : output_bus);
const AudioUnitScope scope = ((iscapture) ? kAudioUnitScope_Output :
kAudioUnitScope_Input);
/* stop processing the audio unit */
result = AudioOutputUnitStop(this->hidden->audioUnit);
/* Remove the input callback */
memset(&callback, '\0', sizeof (AURenderCallbackStruct));
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_SetRenderCallback,
scope, bus, &callback, sizeof (callback));
CloseComponent(this->hidden->audioUnit);
SDL_free(this->hidden->buffer);
SDL_free(this->hidden);
this->hidden = NULL;
}
}
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#define CHECK_RESULT(msg) \
if (result != noErr) { \
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COREAUDIO_CloseDevice(this); \
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SDL_SetError("CoreAudio error (%s): %d", msg, (int) result); \
return 0; \
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}
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static int
find_device_by_name(_THIS, const char *devname, int iscapture)
{
AudioDeviceID devid = 0;
OSStatus result = noErr;
UInt32 size = 0;
UInt32 alive = 0;
pid_t pid = 0;
if (devname == NULL) {
size = sizeof (AudioDeviceID);
const AudioHardwarePropertyID propid =
((iscapture) ? kAudioHardwarePropertyDefaultInputDevice :
kAudioHardwarePropertyDefaultOutputDevice);
result = AudioHardwareGetProperty(propid, &size, &devid);
CHECK_RESULT("AudioHardwareGetProperty (default device)");
} else {
if (!find_device_id(devname, iscapture, &devid)) {
SDL_SetError("CoreAudio: No such audio device.");
return 0;
}
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}
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size = sizeof (alive);
result = AudioDeviceGetProperty(devid, 0, iscapture,
kAudioDevicePropertyDeviceIsAlive,
&size, &alive);
CHECK_RESULT("AudioDeviceGetProperty (kAudioDevicePropertyDeviceIsAlive)");
if (!alive) {
SDL_SetError("CoreAudio: requested device exists, but isn't alive.");
return 0;
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}
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size = sizeof (pid);
result = AudioDeviceGetProperty(devid, 0, iscapture,
kAudioDevicePropertyHogMode, &size, &pid);
/* some devices don't support this property, so errors are fine here. */
if ((result == noErr) && (pid != -1)) {
SDL_SetError("CoreAudio: requested device is being hogged.");
return 0;
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}
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this->hidden->deviceID = devid;
return 1;
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}
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static int
prepare_audiounit(_THIS, const char *devname, int iscapture,
const AudioStreamBasicDescription *strdesc)
{
OSStatus result = noErr;
AURenderCallbackStruct callback;
ComponentDescription desc;
Component comp = NULL;
int use_system_device = 0;
UInt32 enableIO = 0;
const AudioUnitElement output_bus = 0;
const AudioUnitElement input_bus = 1;
const AudioUnitElement bus = ((iscapture) ? input_bus : output_bus);
const AudioUnitScope scope = ((iscapture) ? kAudioUnitScope_Output :
kAudioUnitScope_Input);
if (!find_device_by_name(this, devname, iscapture)) {
SDL_SetError("Couldn't find requested CoreAudio device");
return 0;
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}
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memset(&desc, '\0', sizeof(ComponentDescription));
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_HALOutput;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
comp = FindNextComponent(NULL, &desc);
if (comp == NULL) {
SDL_SetError("Couldn't find requested CoreAudio component");
return 0;
}
/* Open & initialize the audio unit */
result = OpenAComponent(comp, &this->hidden->audioUnit);
CHECK_RESULT("OpenAComponent");
// !!! FIXME: this is wrong?
enableIO = ((iscapture) ? 1 : 0);
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input, input_bus,
&enableIO, sizeof (enableIO));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO input)");
// !!! FIXME: this is wrong?
enableIO = ((iscapture) ? 0 : 1);
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output, output_bus,
&enableIO, sizeof (enableIO));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO output)");
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioOutputUnitProperty_CurrentDevice,
kAudioUnitScope_Global, 0,
&this->hidden->deviceID,
sizeof (AudioDeviceID));
CHECK_RESULT("AudioUnitSetProperty (kAudioOutputUnitProperty_CurrentDevice)");
/* Set the data format of the audio unit. */
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_StreamFormat,
scope, bus, strdesc, sizeof (*strdesc));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)");
/* Set the audio callback */
memset(&callback, '\0', sizeof (AURenderCallbackStruct));
callback.inputProc = ((iscapture) ? inputCallback : outputCallback);
callback.inputProcRefCon = this;
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_SetRenderCallback,
scope, bus, &callback, sizeof (callback));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
/* Calculate the final parameters for this audio specification */
SDL_CalculateAudioSpec(&this->spec);
/* Allocate a sample buffer */
this->hidden->bufferOffset = this->hidden->bufferSize = this->spec.size;
this->hidden->buffer = SDL_malloc(this->hidden->bufferSize);
result = AudioUnitInitialize(this->hidden->audioUnit);
CHECK_RESULT("AudioUnitInitialize");
/* Finally, start processing of the audio unit */
result = AudioOutputUnitStart(this->hidden->audioUnit);
CHECK_RESULT("AudioOutputUnitStart");
/* We're running! */
return 1;
}
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static int
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COREAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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{
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AudioStreamBasicDescription strdesc;
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SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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int valid_datatype = 0;
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/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
SDL_OutOfMemory();
return (0);
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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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;
strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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strdesc.mChannelsPerFrame = this->spec.channels;
strdesc.mSampleRate = this->spec.freq;
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strdesc.mFramesPerPacket = 1;
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while ((!valid_datatype) && (test_format)) {
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this->spec.format = test_format;
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/* Just a list of valid SDL formats, so people don't pass junk here. */
switch (test_format) {
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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;
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strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))
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strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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if (SDL_AUDIO_ISFLOAT(this->spec.format))
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strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
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else if (SDL_AUDIO_ISSIGNED(this->spec.format))
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strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
break;
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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 0;
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}
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strdesc.mBytesPerFrame =
strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
strdesc.mBytesPerPacket =
strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
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if (!prepare_audiounit(this, devname, iscapture, &strdesc)) {
return 0; /* prepare_audiounit() will call SDL_SetError()... */
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}
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return 1; /* good to go. */
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}
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static int
COREAUDIO_Init(SDL_AudioDriverImpl *impl)
{
/* Set the function pointers */
impl->DetectDevices = COREAUDIO_DetectDevices;
impl->GetDeviceName = COREAUDIO_GetDeviceName;
impl->OpenDevice = COREAUDIO_OpenDevice;
impl->CloseDevice = COREAUDIO_CloseDevice;
impl->Deinitialize = COREAUDIO_Deinitialize;
impl->ProvidesOwnCallbackThread = 1;
build_device_lists(); /* do an initial check for devices... */
return 1;
}
AudioBootStrap COREAUDIO_bootstrap = {
"coreaudio", "Mac OS X CoreAudio",
COREAUDIO_Available, COREAUDIO_Init, 0
};
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/* vi: set ts=4 sw=4 expandtab: */