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Core Audio: Use a callback for the onStop event.

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This commit is contained in:
David Reid
2018-07-01 18:13:34 +10:00
parent 19be46de60
commit 3efb8896ca
1 changed files with 50 additions and 25 deletions
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mini_al.h
+50 -25
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@@ -13782,6 +13782,28 @@ OSStatus mal_on_input__coreaudio(void* pUserData, AudioUnitRenderActionFlags* pA
return noErr;
}
void on_start_stop__coreaudio(void* pUserData, AudioUnit audioUnit, AudioUnitPropertyID propertyID, AudioUnitScope scope, AudioUnitElement element)
{
(void)propertyID;
mal_device* pDevice = (mal_device*)pUserData;
mal_assert(pDevice != NULL);
UInt32 isRunning;
UInt32 isRunningSize = sizeof(isRunning);
OSStatus status = AudioUnitGetProperty(audioUnit, kAudioOutputUnitProperty_IsRunning, scope, element, &isRunning, &isRunningSize);
if (status != noErr) {
return; // Don't really know what to do in this case... just ignore it, I suppose...
}
if (!isRunning) {
mal_stop_proc onStop = pDevice->onStop;
if (onStop) {
onStop(pDevice);
}
}
}
mal_result mal_device_init__coreaudio(mal_context* pContext, mal_device_type deviceType, const mal_device_id* pDeviceID, const mal_device_config* pConfig, mal_device* pDevice)
{
@@ -13947,6 +13969,33 @@ mal_result mal_device_init__coreaudio(mal_context* pContext, mal_device_type dev
pDevice->bufferSizeInFrames = actualBufferSizeInFrames * pDevice->periods;
// Callbacks.
AURenderCallbackStruct callbackInfo;
callbackInfo.inputProcRefCon = pDevice;
if (deviceType == mal_device_type_playback) {
callbackInfo.inputProc = mal_on_output__coreaudio;
status = AudioUnitSetProperty((AudioUnit)pDevice->coreaudio.audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Global, MAL_COREAUDIO_OUTPUT_BUS, &callbackInfo, sizeof(callbackInfo));
if (status != noErr) {
AudioComponentInstanceDispose((AudioUnit)pDevice->coreaudio.audioUnit);
return mal_result_from_OSStatus(status);
}
} else {
callbackInfo.inputProc = mal_on_input__coreaudio;
status = AudioUnitSetProperty((AudioUnit)pDevice->coreaudio.audioUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, MAL_COREAUDIO_INPUT_BUS, &callbackInfo, sizeof(callbackInfo));
if (status != noErr) {
AudioComponentInstanceDispose((AudioUnit)pDevice->coreaudio.audioUnit);
return mal_result_from_OSStatus(status);
}
}
// We need to listen for stop events.
status = AudioUnitAddPropertyListener((AudioUnit)pDevice->coreaudio.audioUnit, kAudioOutputUnitProperty_IsRunning, on_start_stop__coreaudio, pDevice);
if (status != noErr) {
AudioComponentInstanceDispose((AudioUnit)pDevice->coreaudio.audioUnit);
return mal_result_from_OSStatus(status);
}
// We need a buffer list if this is an input device. We render into this in the input callback.
if (deviceType == mal_device_type_capture) {
@@ -13987,29 +14036,10 @@ mal_result mal_device_init__coreaudio(mal_context* pContext, mal_device_type dev
}
// Callbacks.
AURenderCallbackStruct callbackInfo;
callbackInfo.inputProcRefCon = pDevice;
if (deviceType == mal_device_type_playback) {
callbackInfo.inputProc = mal_on_output__coreaudio;
status = AudioUnitSetProperty((AudioUnit)pDevice->coreaudio.audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Global, MAL_COREAUDIO_OUTPUT_BUS, &callbackInfo, sizeof(callbackInfo));
if (status != noErr) {
AudioComponentInstanceDispose((AudioUnit)pDevice->coreaudio.audioUnit);
return mal_result_from_OSStatus(status);
}
} else {
callbackInfo.inputProc = mal_on_input__coreaudio;
status = AudioUnitSetProperty((AudioUnit)pDevice->coreaudio.audioUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, MAL_COREAUDIO_INPUT_BUS, &callbackInfo, sizeof(callbackInfo));
if (status != noErr) {
AudioComponentInstanceDispose((AudioUnit)pDevice->coreaudio.audioUnit);
return mal_result_from_OSStatus(status);
}
}
// Initialize the audio unit.
status = AudioUnitInitialize((AudioUnit)pDevice->coreaudio.audioUnit);
if (status != noErr) {
mal_free(pDevice->coreaudio.pAudioBufferList);
AudioComponentInstanceDispose((AudioUnit)pDevice->coreaudio.audioUnit);
return mal_result_from_OSStatus(status);
}
@@ -14039,11 +14069,6 @@ mal_result mal_device__stop_backend__coreaudio(mal_device* pDevice)
return mal_result_from_OSStatus(status);
}
mal_stop_proc onStop = pDevice->onStop;
if (onStop) {
onStop(pDevice);
}
return MAL_SUCCESS;
}
#endif // Core Audio