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Cleanly switch between audio recording, playback, and both, on iOS

This commit is contained in:
Sam Lantinga 2020-04-14 22:26:02 -07:00
parent 14661d3f30
commit a990a34ac4
1 changed files with 90 additions and 16 deletions
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106
src/audio/coreaudio/SDL_coreaudio.m
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@ -280,11 +280,47 @@ device_list_changed(AudioObjectID systemObj, UInt32 num_addr, const AudioObjectP
#endif
static int open_playback_devices = 0;
static int open_capture_devices = 0;
static int open_playback_devices;
static int open_capture_devices;
static int num_open_devices;
static SDL_AudioDevice **open_devices;
#if !MACOSX_COREAUDIO
static BOOL session_active = NO;
static void pause_audio_devices()
{
int i;
if (!open_devices) {
return;
}
for (i = 0; i < num_open_devices; ++i) {
SDL_AudioDevice *device = open_devices[i];
if (device->hidden->audioQueue && !device->hidden->interrupted) {
AudioQueuePause(device->hidden->audioQueue);
}
}
}
static void resume_audio_devices()
{
int i;
if (!open_devices) {
return;
}
for (i = 0; i < num_open_devices; ++i) {
SDL_AudioDevice *device = open_devices[i];
if (device->hidden->audioQueue && !device->hidden->interrupted) {
AudioQueueStart(device->hidden->audioQueue, NULL);
}
}
}
static void interruption_begin(_THIS)
{
if (this != NULL && this->hidden->audioQueue != NULL) {
@ -379,9 +415,18 @@ static BOOL update_audio_session(_THIS, SDL_bool open, SDL_bool allow_playandrec
options |= AVAudioSessionCategoryOptionAllowBluetoothA2DP |
AVAudioSessionCategoryOptionAllowAirPlay;
}
if (category == AVAudioSessionCategoryPlayback ||
category == AVAudioSessionCategoryPlayAndRecord) {
options |= AVAudioSessionCategoryOptionDuckOthers;
}
if ([session respondsToSelector:@selector(setCategory:mode:options:error:)]) {
if (![session.category isEqualToString:category] || session.categoryOptions != options) {
/* Stop the current session so we don't interrupt other application audio */
pause_audio_devices();
[session setActive:NO error:nil];
session_active = NO;
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);
@ -390,6 +435,11 @@ static BOOL update_audio_session(_THIS, SDL_bool open, SDL_bool allow_playandrec
}
} else {
if (![session.category isEqualToString:category]) {
/* Stop the current session so we don't interrupt other application audio */
pause_audio_devices();
[session setActive:NO error:nil];
session_active = NO;
if (![session setCategory:category error:&err]) {
NSString *desc = err.description;
SDL_SetError("Could not set Audio Session category: %s", desc.UTF8String);
@ -398,7 +448,7 @@ static BOOL update_audio_session(_THIS, SDL_bool open, SDL_bool allow_playandrec
}
}
if (open && (open_playback_devices + open_capture_devices) == 1) {
if ((open_playback_devices || open_capture_devices) && !session_active) {
if (![session setActive:YES error:&err]) {
if ([err code] == AVAudioSessionErrorCodeResourceNotAvailable &&
category == AVAudioSessionCategoryPlayAndRecord) {
@ -409,8 +459,12 @@ static BOOL update_audio_session(_THIS, SDL_bool open, SDL_bool allow_playandrec
SDL_SetError("Could not activate Audio Session: %s", desc.UTF8String);
return NO;
}
} else if (!open_playback_devices && !open_capture_devices) {
session_active = YES;
resume_audio_devices();
} else if (!open_playback_devices && !open_capture_devices && session_active) {
pause_audio_devices();
[session setActive:NO error:nil];
session_active = NO;
}
if (open) {
@ -438,14 +492,12 @@ static BOOL update_audio_session(_THIS, SDL_bool open, SDL_bool allow_playandrec
this->hidden->interruption_listener = CFBridgingRetain(listener);
} else {
if (this->hidden->interruption_listener != NULL) {
SDLInterruptionListener *listener = nil;
listener = (SDLInterruptionListener *) CFBridgingRelease(this->hidden->interruption_listener);
[center removeObserver:listener];
@synchronized (listener) {
listener.device = NULL;
}
}
SDLInterruptionListener *listener = nil;
listener = (SDLInterruptionListener *) CFBridgingRelease(this->hidden->interruption_listener);
[center removeObserver:listener];
@synchronized (listener) {
listener.device = NULL;
}
}
}
@ -471,7 +523,7 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
Uint8 *ptr = (Uint8 *) inBuffer->mAudioData;
while (remaining > 0) {
if ( SDL_AudioStreamAvailable(this->stream) == 0 ) {
if (SDL_AudioStreamAvailable(this->stream) == 0) {
/* Generate the data */
SDL_LockMutex(this->mixer_lock);
(*this->callbackspec.callback)(this->callbackspec.userdata,
@ -480,10 +532,10 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
this->hidden->bufferOffset = 0;
SDL_AudioStreamPut(this->stream, this->hidden->buffer, this->hidden->bufferSize);
}
if ( SDL_AudioStreamAvailable(this->stream) > 0 ) {
if (SDL_AudioStreamAvailable(this->stream) > 0) {
int got;
UInt32 len = SDL_AudioStreamAvailable(this->stream);
if ( len > remaining )
if (len > remaining)
len = remaining;
got = SDL_AudioStreamGet(this->stream, ptr, len);
SDL_assert((got < 0) || (got == len));
@ -529,7 +581,7 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
static void
inputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer,
const AudioTimeStamp *inStartTime, UInt32 inNumberPacketDescriptions,
const AudioStreamPacketDescription *inPacketDescs )
const AudioStreamPacketDescription *inPacketDescs)
{
SDL_AudioDevice *this = (SDL_AudioDevice *) inUserData;
@ -619,6 +671,7 @@ static void
COREAUDIO_CloseDevice(_THIS)
{
const SDL_bool iscapture = this->iscapture;
int i;
/* !!! 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?) */
@ -638,6 +691,20 @@ COREAUDIO_CloseDevice(_THIS)
update_audio_session(this, SDL_FALSE, SDL_TRUE);
#endif
for (i = 0; i < num_open_devices; ++i) {
if (open_devices[i] == this) {
--num_open_devices;
if (i < num_open_devices) {
SDL_memmove(&open_devices[i], &open_devices[i+1], sizeof(open_devices[i])*(num_open_devices - i));
}
break;
}
}
if (num_open_devices == 0) {
SDL_free(open_devices);
open_devices = NULL;
}
/* if callback fires again, feed silence; don't call into the app. */
SDL_AtomicSet(&this->paused, 1);
@ -942,6 +1009,7 @@ COREAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
AudioStreamBasicDescription *strdesc;
SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
int valid_datatype = 0;
SDL_AudioDevice **new_open_devices;
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
@ -959,6 +1027,12 @@ COREAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
open_playback_devices++;
}
new_open_devices = (SDL_AudioDevice **)SDL_realloc(open_devices, sizeof(open_devices[0]) * (num_open_devices + 1));
if (new_open_devices) {
open_devices = new_open_devices;
open_devices[num_open_devices++] = this;
}
#if !MACOSX_COREAUDIO
if (!update_audio_session(this, SDL_TRUE, SDL_TRUE)) {
return -1;