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SDL_coreaudio.m
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_AUDIO_DRIVER_COREAUDIO
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/* !!! FIXME: clean out some of the macro salsa in here. */
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#include "SDL_audio.h"
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#include "SDL_hints.h"
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#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
#include "SDL_coreaudio.h"
#include "SDL_assert.h"
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#include "../../thread/SDL_systhread.h"
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#define DEBUG_COREAUDIO 0
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#if DEBUG_COREAUDIO
#define CHECK_RESULT(msg) \
if (result != noErr) { \
printf("COREAUDIO: Got error %d from '%s'!\n", (int) result, msg); \
SDL_SetError("CoreAudio error (%s): %d", msg, (int) result); \
return 0; \
}
#else
#define CHECK_RESULT(msg) \
if (result != noErr) { \
SDL_SetError("CoreAudio error (%s): %d", msg, (int) result); \
return 0; \
}
#endif
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#if MACOSX_COREAUDIO
static const AudioObjectPropertyAddress devlist_address = {
kAudioHardwarePropertyDevices,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};
typedef void (*addDevFn)(const char *name, const int iscapture, AudioDeviceID devId, void *data);
typedef struct AudioDeviceList
{
AudioDeviceID devid;
SDL_bool alive;
struct AudioDeviceList *next;
} AudioDeviceList;
static AudioDeviceList *output_devs = NULL;
static AudioDeviceList *capture_devs = NULL;
static SDL_bool
add_to_internal_dev_list(const int iscapture, AudioDeviceID devId)
{
AudioDeviceList *item = (AudioDeviceList *) SDL_malloc(sizeof (AudioDeviceList));
if (item == NULL) {
return SDL_FALSE;
}
item->devid = devId;
item->alive = SDL_TRUE;
item->next = iscapture ? capture_devs : output_devs;
if (iscapture) {
capture_devs = item;
} else {
output_devs = item;
}
return SDL_TRUE;
}
static void
addToDevList(const char *name, const int iscapture, AudioDeviceID devId, void *data)
{
if (add_to_internal_dev_list(iscapture, devId)) {
SDL_AddAudioDevice(iscapture, name, (void *) ((size_t) devId));
}
}
static void
build_device_list(int iscapture, addDevFn addfn, void *addfndata)
{
OSStatus result = noErr;
UInt32 size = 0;
AudioDeviceID *devs = NULL;
UInt32 i = 0;
UInt32 max = 0;
result = AudioObjectGetPropertyDataSize(kAudioObjectSystemObject,
&devlist_address, 0, NULL, &size);
if (result != kAudioHardwareNoError)
return;
devs = (AudioDeviceID *) alloca(size);
if (devs == NULL)
return;
result = AudioObjectGetPropertyData(kAudioObjectSystemObject,
&devlist_address, 0, NULL, &size, devs);
if (result != kAudioHardwareNoError)
return;
max = size / sizeof (AudioDeviceID);
for (i = 0; i < max; i++) {
CFStringRef cfstr = NULL;
char *ptr = NULL;
AudioDeviceID dev = devs[i];
AudioBufferList *buflist = NULL;
int usable = 0;
CFIndex len = 0;
const AudioObjectPropertyAddress addr = {
kAudioDevicePropertyStreamConfiguration,
iscapture ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMaster
};
const AudioObjectPropertyAddress nameaddr = {
kAudioObjectPropertyName,
iscapture ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMaster
};
result = AudioObjectGetPropertyDataSize(dev, &addr, 0, NULL, &size);
if (result != noErr)
continue;
buflist = (AudioBufferList *) SDL_malloc(size);
if (buflist == NULL)
continue;
result = AudioObjectGetPropertyData(dev, &addr, 0, NULL,
&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;
size = sizeof (CFStringRef);
result = AudioObjectGetPropertyData(dev, &nameaddr, 0, NULL, &size, &cfstr);
if (result != kAudioHardwareNoError)
continue;
len = CFStringGetMaximumSizeForEncoding(CFStringGetLength(cfstr),
kCFStringEncodingUTF8);
ptr = (char *) SDL_malloc(len + 1);
usable = ((ptr != NULL) &&
(CFStringGetCString
(cfstr, ptr, len + 1, kCFStringEncodingUTF8)));
CFRelease(cfstr);
if (usable) {
len = strlen(ptr);
/* Some devices have whitespace at the end...trim it. */
while ((len > 0) && (ptr[len - 1] == ' ')) {
len--;
}
usable = (len > 0);
}
if (usable) {
ptr[len] = '\0';
#if DEBUG_COREAUDIO
printf("COREAUDIO: Found %s device #%d: '%s' (devid %d)\n",
((iscapture) ? "capture" : "output"),
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(int) i, ptr, (int) dev);
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#endif
addfn(ptr, iscapture, dev, addfndata);
}
SDL_free(ptr); /* addfn() would have copied the string. */
}
}
static void
free_audio_device_list(AudioDeviceList **list)
{
AudioDeviceList *item = *list;
while (item) {
AudioDeviceList *next = item->next;
SDL_free(item);
item = next;
}
*list = NULL;
}
static void
COREAUDIO_DetectDevices(void)
{
build_device_list(SDL_TRUE, addToDevList, NULL);
build_device_list(SDL_FALSE, addToDevList, NULL);
}
static void
build_device_change_list(const char *name, const int iscapture, AudioDeviceID devId, void *data)
{
AudioDeviceList **list = (AudioDeviceList **) data;
AudioDeviceList *item;
for (item = *list; item != NULL; item = item->next) {
if (item->devid == devId) {
item->alive = SDL_TRUE;
return;
}
}
add_to_internal_dev_list(iscapture, devId); /* new device, add it. */
SDL_AddAudioDevice(iscapture, name, (void *) ((size_t) devId));
}
static void
reprocess_device_list(const int iscapture, AudioDeviceList **list)
{
AudioDeviceList *item;
AudioDeviceList *prev = NULL;
for (item = *list; item != NULL; item = item->next) {
item->alive = SDL_FALSE;
}
build_device_list(iscapture, build_device_change_list, list);
/* free items in the list that aren't still alive. */
item = *list;
while (item != NULL) {
AudioDeviceList *next = item->next;
if (item->alive) {
prev = item;
} else {
SDL_RemoveAudioDevice(iscapture, (void *) ((size_t) item->devid));
if (prev) {
prev->next = item->next;
} else {
*list = item->next;
}
SDL_free(item);
}
item = next;
}
}
/* this is called when the system's list of available audio devices changes. */
static OSStatus
device_list_changed(AudioObjectID systemObj, UInt32 num_addr, const AudioObjectPropertyAddress *addrs, void *data)
{
reprocess_device_list(SDL_TRUE, &capture_devs);
reprocess_device_list(SDL_FALSE, &output_devs);
return 0;
}
#endif
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static int open_playback_devices = 0;
static int open_capture_devices = 0;
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#if !MACOSX_COREAUDIO
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static void interruption_begin(_THIS)
{
if (this != NULL && this->hidden->audioQueue != NULL) {
this->hidden->interrupted = SDL_TRUE;
AudioQueuePause(this->hidden->audioQueue);
}
}
static void interruption_end(_THIS)
{
if (this != NULL && this->hidden != NULL && this->hidden->audioQueue != NULL
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&& this->hidden->interrupted
&& AudioQueueStart(this->hidden->audioQueue, NULL) == AVAudioSessionErrorCodeNone) {
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this->hidden->interrupted = SDL_FALSE;
}
}
@interface SDLInterruptionListener : NSObject
@property (nonatomic, assign) SDL_AudioDevice *device;
@end
@implementation SDLInterruptionListener
- (void)audioSessionInterruption:(NSNotification *)note
{
@synchronized (self) {
NSNumber *type = note.userInfo[AVAudioSessionInterruptionTypeKey];
if (type.unsignedIntegerValue == AVAudioSessionInterruptionTypeBegan) {
interruption_begin(self.device);
} else {
interruption_end(self.device);
}
}
}
- (void)applicationBecameActive:(NSNotification *)note
{
@synchronized (self) {
interruption_end(self.device);
}
}
@end
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static BOOL update_audio_session(_THIS, SDL_bool open, SDL_bool allow_playandrecord)
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{
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@autoreleasepool {
AVAudioSession *session = [AVAudioSession sharedInstance];
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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
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NSString *category = AVAudioSessionCategoryPlayback;
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NSString *mode = AVAudioSessionModeDefault;
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NSUInteger options = AVAudioSessionCategoryOptionMixWithOthers;
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NSError *err = nil;
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const char *hint;
hint = SDL_GetHint(SDL_HINT_AUDIO_CATEGORY);
if (hint) {
if (SDL_strcasecmp(hint, "AVAudioSessionCategoryAmbient") == 0) {
category = AVAudioSessionCategoryAmbient;
} else if (SDL_strcasecmp(hint, "AVAudioSessionCategorySoloAmbient") == 0) {
category = AVAudioSessionCategorySoloAmbient;
options &= ~AVAudioSessionCategoryOptionMixWithOthers;
} else if (SDL_strcasecmp(hint, "AVAudioSessionCategoryPlayback") == 0 ||
SDL_strcasecmp(hint, "playback") == 0) {
category = AVAudioSessionCategoryPlayback;
options &= ~AVAudioSessionCategoryOptionMixWithOthers;
} else if (SDL_strcasecmp(hint, "AVAudioSessionCategoryPlayAndRecord") == 0 ||
SDL_strcasecmp(hint, "playandrecord") == 0) {
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if (allow_playandrecord) {
category = AVAudioSessionCategoryPlayAndRecord;
}
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}
} else if (open_playback_devices && open_capture_devices) {
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category = AVAudioSessionCategoryPlayAndRecord;
} else if (open_capture_devices) {
category = AVAudioSessionCategoryRecord;
}
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#if !TARGET_OS_TV
if (category == AVAudioSessionCategoryPlayAndRecord) {
options |= AVAudioSessionCategoryOptionDefaultToSpeaker;
}
#endif
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if ([session respondsToSelector:@selector(setCategory:mode:options:error:)]) {
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if (![session.category isEqualToString:category] || session.categoryOptions != options) {
if (![session setCategory:category mode:mode options:options error:&err]) {
NSString *desc = err.description;
SDL_SetError("Could not set Audio Session category: %s", desc.UTF8String);
return NO;
}
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}
} else {
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if (![session.category isEqualToString:category]) {
if (![session setCategory:category error:&err]) {
NSString *desc = err.description;
SDL_SetError("Could not set Audio Session category: %s", desc.UTF8String);
return NO;
}
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}
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}
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if (open && (open_playback_devices + open_capture_devices) == 1) {
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if (![session setActive:YES error:&err]) {
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if ([err code] == AVAudioSessionErrorCodeResourceNotAvailable &&
category == AVAudioSessionCategoryPlayAndRecord) {
return update_audio_session(this, open, SDL_FALSE);
}
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NSString *desc = err.description;
SDL_SetError("Could not activate Audio Session: %s", desc.UTF8String);
return NO;
}
} else if (!open_playback_devices && !open_capture_devices) {
[session setActive:NO error:nil];
}
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if (open) {
SDLInterruptionListener *listener = [SDLInterruptionListener new];
listener.device = this;
[center addObserver:listener
selector:@selector(audioSessionInterruption:)
name:AVAudioSessionInterruptionNotification
object:session];
/* An interruption end notification is not guaranteed to be sent if
we were previously interrupted... resuming if needed when the app
becomes active seems to be the way to go. */
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// Note: object: below needs to be nil, as otherwise it filters by the object, and session doesn't send foreground / active notifications. johna
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[center addObserver:listener
selector:@selector(applicationBecameActive:)
name:UIApplicationDidBecomeActiveNotification
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object:nil];
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[center addObserver:listener
selector:@selector(applicationBecameActive:)
name:UIApplicationWillEnterForegroundNotification
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object:nil];
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this->hidden->interruption_listener = CFBridgingRetain(listener);
} else {
if (this->hidden->interruption_listener != NULL) {
SDLInterruptionListener *listener = nil;
listener = (SDLInterruptionListener *) CFBridgingRelease(this->hidden->interruption_listener);
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[center removeObserver:listener];
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@synchronized (listener) {
listener.device = NULL;
}
}
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}
}
return YES;
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}
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#endif
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/* The AudioQueue callback */
static void
outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer)
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{
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SDL_AudioDevice *this = (SDL_AudioDevice *) inUserData;
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if (SDL_AtomicGet(&this->hidden->shutdown)) {
return; /* don't do anything. */
}
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if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) {
/* Supply silence if audio is not enabled or paused */
SDL_memset(inBuffer->mAudioData, this->spec.silence, inBuffer->mAudioDataBytesCapacity);
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} else if (this->stream) {
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UInt32 remaining = inBuffer->mAudioDataBytesCapacity;
Uint8 *ptr = (Uint8 *) inBuffer->mAudioData;
while (remaining > 0) {
if ( SDL_AudioStreamAvailable(this->stream) == 0 ) {
/* Generate the data */
SDL_LockMutex(this->mixer_lock);
(*this->callbackspec.callback)(this->callbackspec.userdata,
this->hidden->buffer, this->hidden->bufferSize);
SDL_UnlockMutex(this->mixer_lock);
this->hidden->bufferOffset = 0;
SDL_AudioStreamPut(this->stream, this->hidden->buffer, this->hidden->bufferSize);
}
if ( SDL_AudioStreamAvailable(this->stream) > 0 ) {
int got;
UInt32 len = SDL_AudioStreamAvailable(this->stream);
if ( len > remaining )
len = remaining;
got = SDL_AudioStreamGet(this->stream, ptr, len);
SDL_assert((got < 0) || (got == len));
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if (got != len) {
SDL_memset(ptr, this->spec.silence, len);
}
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ptr = ptr + len;
remaining -= len;
}
}
} else {
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UInt32 remaining = inBuffer->mAudioDataBytesCapacity;
Uint8 *ptr = (Uint8 *) inBuffer->mAudioData;
while (remaining > 0) {
UInt32 len;
if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
/* Generate the data */
SDL_LockMutex(this->mixer_lock);
(*this->callbackspec.callback)(this->callbackspec.userdata,
this->hidden->buffer, this->hidden->bufferSize);
SDL_UnlockMutex(this->mixer_lock);
this->hidden->bufferOffset = 0;
}
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len = this->hidden->bufferSize - this->hidden->bufferOffset;
if (len > remaining) {
len = remaining;
}
SDL_memcpy(ptr, (char *)this->hidden->buffer +
this->hidden->bufferOffset, len);
ptr = ptr + len;
remaining -= len;
this->hidden->bufferOffset += len;
}
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}
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AudioQueueEnqueueBuffer(this->hidden->audioQueue, inBuffer, 0, NULL);
inBuffer->mAudioDataByteSize = inBuffer->mAudioDataBytesCapacity;
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}
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static void
inputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer,
const AudioTimeStamp *inStartTime, UInt32 inNumberPacketDescriptions,
const AudioStreamPacketDescription *inPacketDescs )
{
SDL_AudioDevice *this = (SDL_AudioDevice *) inUserData;
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if (SDL_AtomicGet(&this->shutdown)) {
return; /* don't do anything. */
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}
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/* ignore unless we're active. */
if (!SDL_AtomicGet(&this->paused) && SDL_AtomicGet(&this->enabled) && !SDL_AtomicGet(&this->paused)) {
const Uint8 *ptr = (const Uint8 *) inBuffer->mAudioData;
UInt32 remaining = inBuffer->mAudioDataByteSize;
while (remaining > 0) {
UInt32 len = this->hidden->bufferSize - this->hidden->bufferOffset;
if (len > remaining) {
len = remaining;
}
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SDL_memcpy((char *)this->hidden->buffer + this->hidden->bufferOffset, ptr, len);
ptr += len;
remaining -= len;
this->hidden->bufferOffset += len;
if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
SDL_LockMutex(this->mixer_lock);
(*this->callbackspec.callback)(this->callbackspec.userdata, this->hidden->buffer, this->hidden->bufferSize);
SDL_UnlockMutex(this->mixer_lock);
this->hidden->bufferOffset = 0;
}
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}
}
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AudioQueueEnqueueBuffer(this->hidden->audioQueue, inBuffer, 0, NULL);
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}
#if MACOSX_COREAUDIO
static const AudioObjectPropertyAddress alive_address =
{
kAudioDevicePropertyDeviceIsAlive,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};
static OSStatus
device_unplugged(AudioObjectID devid, UInt32 num_addr, const AudioObjectPropertyAddress *addrs, void *data)
{
SDL_AudioDevice *this = (SDL_AudioDevice *) data;
SDL_bool dead = SDL_FALSE;
UInt32 isAlive = 1;
UInt32 size = sizeof (isAlive);
OSStatus error;
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if (!SDL_AtomicGet(&this->enabled)) {
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return 0; /* already known to be dead. */
}
error = AudioObjectGetPropertyData(this->hidden->deviceID, &alive_address,
0, NULL, &size, &isAlive);
if (error == kAudioHardwareBadDeviceError) {
dead = SDL_TRUE; /* device was unplugged. */
} else if ((error == kAudioHardwareNoError) && (!isAlive)) {
dead = SDL_TRUE; /* device died in some other way. */
}
if (dead) {
SDL_OpenedAudioDeviceDisconnected(this);
}
return 0;
}
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/* macOS calls this when the default device changed (if we have a default device open). */
static OSStatus
default_device_changed(AudioObjectID inObjectID, UInt32 inNumberAddresses, const AudioObjectPropertyAddress *inAddresses, void *inUserData)
{
SDL_AudioDevice *this = (SDL_AudioDevice *) inUserData;
#if DEBUG_COREAUDIO
printf("COREAUDIO: default device changed for SDL audio device %p!\n", this);
#endif
SDL_AtomicSet(&this->hidden->device_change_flag, 1); /* let the audioqueue thread pick up on this when safe to do so. */
return noErr;
}
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#endif
static void
COREAUDIO_CloseDevice(_THIS)
{
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const SDL_bool iscapture = this->iscapture;
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/* !!! FIXME: what does iOS do when a bluetooth audio device vanishes? Headphones unplugged? */
/* !!! FIXME: (we only do a "default" device on iOS right now...can we do more?) */
#if MACOSX_COREAUDIO
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if (this->handle != NULL) { /* we don't register this listener for default devices. */
AudioObjectRemovePropertyListener(this->hidden->deviceID, &alive_address, device_unplugged, this);
}
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#endif
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if (iscapture) {
open_capture_devices--;
} else {
open_playback_devices--;
}
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#if !MACOSX_COREAUDIO
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update_audio_session(this, SDL_FALSE, SDL_TRUE);
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#endif
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/* if callback fires again, feed silence; don't call into the app. */
SDL_AtomicSet(&this->paused, 1);
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if (this->hidden->audioQueue) {
AudioQueueDispose(this->hidden->audioQueue, 1);
}
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if (this->hidden->thread) {
SDL_AtomicSet(&this->hidden->shutdown, 1);
SDL_WaitThread(this->hidden->thread, NULL);
}
if (this->hidden->ready_semaphore) {
SDL_DestroySemaphore(this->hidden->ready_semaphore);
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}
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/* AudioQueueDispose() frees the actual buffer objects. */
SDL_free(this->hidden->audioBuffer);
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SDL_free(this->hidden->thread_error);
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SDL_free(this->hidden->buffer);
SDL_free(this->hidden);
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}
#if MACOSX_COREAUDIO
static int
prepare_device(_THIS, void *handle, int iscapture)
{
AudioDeviceID devid = (AudioDeviceID) ((size_t) handle);
OSStatus result = noErr;
UInt32 size = 0;
UInt32 alive = 0;
pid_t pid = 0;
AudioObjectPropertyAddress addr = {
0,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};
if (handle == NULL) {
size = sizeof (AudioDeviceID);
addr.mSelector =
((iscapture) ? kAudioHardwarePropertyDefaultInputDevice :
kAudioHardwarePropertyDefaultOutputDevice);
result = AudioObjectGetPropertyData(kAudioObjectSystemObject, &addr,
0, NULL, &size, &devid);
CHECK_RESULT("AudioHardwareGetProperty (default device)");
}
addr.mSelector = kAudioDevicePropertyDeviceIsAlive;
addr.mScope = iscapture ? kAudioDevicePropertyScopeInput :
kAudioDevicePropertyScopeOutput;
size = sizeof (alive);
result = AudioObjectGetPropertyData(devid, &addr, 0, NULL, &size, &alive);
CHECK_RESULT
("AudioDeviceGetProperty (kAudioDevicePropertyDeviceIsAlive)");
if (!alive) {
SDL_SetError("CoreAudio: requested device exists, but isn't alive.");
return 0;
}
addr.mSelector = kAudioDevicePropertyHogMode;
size = sizeof (pid);
result = AudioObjectGetPropertyData(devid, &addr, 0, NULL, &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;
}
this->hidden->deviceID = devid;
return 1;
}
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static int
assign_device_to_audioqueue(_THIS)
{
const AudioObjectPropertyAddress prop = {
kAudioDevicePropertyDeviceUID,
this->iscapture ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMaster
};
OSStatus result;
CFStringRef devuid;
UInt32 devuidsize = sizeof (devuid);
result = AudioObjectGetPropertyData(this->hidden->deviceID, &prop, 0, NULL, &devuidsize, &devuid);
CHECK_RESULT("AudioObjectGetPropertyData (kAudioDevicePropertyDeviceUID)");
result = AudioQueueSetProperty(this->hidden->audioQueue, kAudioQueueProperty_CurrentDevice, &devuid, devuidsize);
CHECK_RESULT("AudioQueueSetProperty (kAudioQueueProperty_CurrentDevice)");
return 1;
}
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#endif
static int
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prepare_audioqueue(_THIS)
733
{
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const AudioStreamBasicDescription *strdesc = &this->hidden->strdesc;
const int iscapture = this->iscapture;
OSStatus result;
int i;
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SDL_assert(CFRunLoopGetCurrent() != NULL);
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if (iscapture) {
result = AudioQueueNewInput(strdesc, inputCallback, this, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode, 0, &this->hidden->audioQueue);
CHECK_RESULT("AudioQueueNewInput");
} else {
result = AudioQueueNewOutput(strdesc, outputCallback, this, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode, 0, &this->hidden->audioQueue);
CHECK_RESULT("AudioQueueNewOutput");
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}
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#if MACOSX_COREAUDIO
if (!assign_device_to_audioqueue(this)) {
return 0;
}
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/* only listen for unplugging on specific devices, not the default device, as that should
switch to a different device (or hang out silently if there _is_ no other device). */
if (this->handle != NULL) {
/* !!! FIXME: what does iOS do when a bluetooth audio device vanishes? Headphones unplugged? */
/* !!! FIXME: (we only do a "default" device on iOS right now...can we do more?) */
/* Fire a callback if the device stops being "alive" (disconnected, etc). */
/* If this fails, oh well, we won't notice a device had an extraordinary event take place. */
AudioObjectAddPropertyListener(this->hidden->deviceID, &alive_address, device_unplugged, this);
}
#endif
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/* Calculate the final parameters for this audio specification */
SDL_CalculateAudioSpec(&this->spec);
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/* Set the channel layout for the audio queue */
AudioChannelLayout layout;
SDL_zero(layout);
switch (this->spec.channels) {
case 1:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_Mono;
break;
case 2:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;
break;
case 3:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_4;
break;
case 4:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_Quadraphonic;
break;
case 5:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_5_0_A;
break;
case 6:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_5_1_A;
break;
case 7:
/* FIXME: Need to move channel[4] (BC) to channel[6] */
layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_6_1_A;
break;
case 8:
layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_7_1_A;
break;
}
if (layout.mChannelLayoutTag != 0) {
result = AudioQueueSetProperty(this->hidden->audioQueue, kAudioQueueProperty_ChannelLayout, &layout, sizeof(layout));
CHECK_RESULT("AudioQueueSetProperty(kAudioQueueProperty_ChannelLayout)");
}
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/* Allocate a sample buffer */
this->hidden->bufferSize = this->spec.size;
this->hidden->bufferOffset = iscapture ? 0 : this->hidden->bufferSize;
this->hidden->buffer = SDL_malloc(this->hidden->bufferSize);
if (this->hidden->buffer == NULL) {
SDL_OutOfMemory();
return 0;
}
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/* Make sure we can feed the device a minimum amount of time */
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double MINIMUM_AUDIO_BUFFER_TIME_MS = 15.0;
#if defined(__IPHONEOS__)
816
if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {
817
/* Older iOS hardware, use 40 ms as a minimum time */
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MINIMUM_AUDIO_BUFFER_TIME_MS = 40.0;
}
820
#endif
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const double msecs = (this->spec.samples / ((double) this->spec.freq)) * 1000.0;
822
int numAudioBuffers = 2;
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if (msecs < MINIMUM_AUDIO_BUFFER_TIME_MS) { /* use more buffers if we have a VERY small sample set. */
numAudioBuffers = ((int)SDL_ceil(MINIMUM_AUDIO_BUFFER_TIME_MS / msecs) * 2);
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}
827
this->hidden->numAudioBuffers = numAudioBuffers;
828
this->hidden->audioBuffer = SDL_calloc(1, sizeof (AudioQueueBufferRef) * numAudioBuffers);
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if (this->hidden->audioBuffer == NULL) {
SDL_OutOfMemory();
return 0;
}
#if DEBUG_COREAUDIO
835
printf("COREAUDIO: numAudioBuffers == %d\n", numAudioBuffers);
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#endif
838
for (i = 0; i < numAudioBuffers; i++) {
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result = AudioQueueAllocateBuffer(this->hidden->audioQueue, this->spec.size, &this->hidden->audioBuffer[i]);
CHECK_RESULT("AudioQueueAllocateBuffer");
SDL_memset(this->hidden->audioBuffer[i]->mAudioData, this->spec.silence, this->hidden->audioBuffer[i]->mAudioDataBytesCapacity);
this->hidden->audioBuffer[i]->mAudioDataByteSize = this->hidden->audioBuffer[i]->mAudioDataBytesCapacity;
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/* !!! FIXME: should we use AudioQueueEnqueueBufferWithParameters and specify all frames be "trimmed" so these are immediately ready to refill with SDL callback data? */
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result = AudioQueueEnqueueBuffer(this->hidden->audioQueue, this->hidden->audioBuffer[i], 0, NULL);
CHECK_RESULT("AudioQueueEnqueueBuffer");
}
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result = AudioQueueStart(this->hidden->audioQueue, NULL);
CHECK_RESULT("AudioQueueStart");
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/* We're running! */
return 1;
}
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static int
audioqueue_thread(void *arg)
857
{
858
SDL_AudioDevice *this = (SDL_AudioDevice *) arg;
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#if MACOSX_COREAUDIO
const AudioObjectPropertyAddress default_device_address = {
this->iscapture ? kAudioHardwarePropertyDefaultInputDevice : kAudioHardwarePropertyDefaultOutputDevice,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};
if (this->handle == NULL) { /* opened the default device? Register to know if the user picks a new default. */
/* we don't care if this fails; we just won't change to new default devices, but we still otherwise function in this case. */
AudioObjectAddPropertyListener(kAudioObjectSystemObject, &default_device_address, default_device_changed, this);
}
#endif
873
874
const int rc = prepare_audioqueue(this);
if (!rc) {
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877
this->hidden->thread_error = SDL_strdup(SDL_GetError());
SDL_SemPost(this->hidden->ready_semaphore);
return 0;
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879
}
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SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
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883
/* init was successful, alert parent thread and start running... */
SDL_SemPost(this->hidden->ready_semaphore);
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886
while (!SDL_AtomicGet(&this->hidden->shutdown)) {
CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.10, 1);
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#if MACOSX_COREAUDIO
if ((this->handle == NULL) && SDL_AtomicGet(&this->hidden->device_change_flag)) {
SDL_AtomicSet(&this->hidden->device_change_flag, 0);
#if DEBUG_COREAUDIO
printf("COREAUDIO: audioqueue_thread is trying to switch to new default device!\n");
#endif
/* if any of this fails, there's not much to do but wait to see if the user gives up
and quits (flagging the audioqueue for shutdown), or toggles to some other system
output device (in which case we'll try again). */
const AudioDeviceID prev_devid = this->hidden->deviceID;
if (prepare_device(this, this->handle, this->iscapture) && (prev_devid != this->hidden->deviceID)) {
AudioQueueStop(this->hidden->audioQueue, 1);
if (assign_device_to_audioqueue(this)) {
int i;
for (i = 0; i < this->hidden->numAudioBuffers; i++) {
SDL_memset(this->hidden->audioBuffer[i]->mAudioData, this->spec.silence, this->hidden->audioBuffer[i]->mAudioDataBytesCapacity);
/* !!! FIXME: should we use AudioQueueEnqueueBufferWithParameters and specify all frames be "trimmed" so these are immediately ready to refill with SDL callback data? */
AudioQueueEnqueueBuffer(this->hidden->audioQueue, this->hidden->audioBuffer[i], 0, NULL);
}
AudioQueueStart(this->hidden->audioQueue, NULL);
}
}
}
#endif
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}
if (!this->iscapture) { /* Drain off any pending playback. */
const CFTimeInterval secs = (((this->spec.size / (SDL_AUDIO_BITSIZE(this->spec.format) / 8)) / this->spec.channels) / ((CFTimeInterval) this->spec.freq)) * 2.0;
CFRunLoopRunInMode(kCFRunLoopDefaultMode, secs, 0);
}
921
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927
#if MACOSX_COREAUDIO
if (this->handle == NULL) {
/* we don't care if this fails; we just won't change to new default devices, but we still otherwise function in this case. */
AudioObjectRemovePropertyListener(kAudioObjectSystemObject, &default_device_address, default_device_changed, this);
}
#endif
928
return 0;
929
}
930
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932
933
static int
COREAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
934
AudioStreamBasicDescription *strdesc;
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939
940
941
942
943
SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
int valid_datatype = 0;
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
return SDL_OutOfMemory();
}
944
SDL_zerop(this->hidden);
945
946
947
strdesc = &this->hidden->strdesc;
948
949
950
951
952
if (iscapture) {
open_capture_devices++;
} else {
open_playback_devices++;
}
953
954
#if !MACOSX_COREAUDIO
955
if (!update_audio_session(this, SDL_TRUE, SDL_TRUE)) {
956
957
return -1;
}
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961
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963
/* Stop CoreAudio from doing expensive audio rate conversion */
@autoreleasepool {
AVAudioSession* session = [AVAudioSession sharedInstance];
[session setPreferredSampleRate:this->spec.freq error:nil];
this->spec.freq = (int)session.sampleRate;
964
#if TARGET_OS_TV
965
966
967
968
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970
971
if (iscapture) {
[session setPreferredInputNumberOfChannels:this->spec.channels error:nil];
this->spec.channels = session.preferredInputNumberOfChannels;
} else {
[session setPreferredOutputNumberOfChannels:this->spec.channels error:nil];
this->spec.channels = session.preferredOutputNumberOfChannels;
}
972
#else
973
/* Calling setPreferredOutputNumberOfChannels seems to break audio output on iOS */
974
#endif /* TARGET_OS_TV */
975
}
976
#endif
977
978
/* Setup a AudioStreamBasicDescription with the requested format */
979
980
981
982
983
984
SDL_zerop(strdesc);
strdesc->mFormatID = kAudioFormatLinearPCM;
strdesc->mFormatFlags = kLinearPCMFormatFlagIsPacked;
strdesc->mChannelsPerFrame = this->spec.channels;
strdesc->mSampleRate = this->spec.freq;
strdesc->mFramesPerPacket = 1;
985
986
987
while ((!valid_datatype) && (test_format)) {
this->spec.format = test_format;
988
/* CoreAudio handles most of SDL's formats natively, but not U16, apparently. */
989
990
991
992
993
994
995
996
997
998
switch (test_format) {
case AUDIO_U8:
case AUDIO_S8:
case AUDIO_S16LSB:
case AUDIO_S16MSB:
case AUDIO_S32LSB:
case AUDIO_S32MSB:
case AUDIO_F32LSB:
case AUDIO_F32MSB:
valid_datatype = 1;
999
strdesc->mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
1000
if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))