start porting audio unit filter to mac

src/msiounit.c

@@ -128,6 +128,9 @@ static MSSndCard *au_duplicate(MSSndCard *obj){
 }
 #define check_auresult(au,method) \
 if (au!=0) ms_error("AudioUnit error for %s: ret=%i",method,au)
+
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
+
 static void au_interuption_listener(void* inClientData, UInt32 inInterruptionState) {
 	if (((MSSndCard*)inClientData)->data == NULL) return;
 	
@@ -153,21 +156,31 @@ static void au_interuption_listener(void* inClientData, UInt32 inInterruptionSta
 	}
 }
 
+#endif
+
 static MSSndCard *au_card_new(const char* name){
 	MSSndCard *card=ms_snd_card_new_with_name(&au_card_desc,name);
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
 	OSStatus auresult = AudioSessionInitialize(NULL, NULL, au_interuption_listener, card);
 	if (auresult != kAudioSessionAlreadyInitialized) {
 		check_auresult(auresult,"AudioSessionInitialize");
 	}
+#endif
 	return card;
 }
 
 static void au_detect(MSSndCardManager *m){
+	MSSndCard *card;
 	ms_debug("au_detect");
-	MSSndCard *card=au_card_new(AU_CARD_RECEIVER);
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
+	card=au_card_new(AU_CARD_RECEIVER);
 	ms_snd_card_manager_add_card(m,card);
 	card=au_card_new(AU_CARD_SPEAKER);
-	ms_snd_card_manager_add_card(m,card);	
+	
+#else
+	card=au_card_new("Audio Unit");
+#endif	
+	ms_snd_card_manager_add_card(m,card);
 }
 
 static OSStatus au_read_cb (
@@ -263,7 +276,7 @@ static void au_configure(AUData *d) {
 	UInt32 doNotSetProperty    = 0;
 	
 	
-	
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
 	auresult = AudioSessionSetActive(true);
 	check_auresult(auresult,"AudioSessionSetActive");
 	
@@ -280,13 +293,19 @@ static void au_configure(AUData *d) {
 	} else {
 		ms_message("Configuring audio session default route to receiver");
 	}
+#endif
+
 	if (d->started == TRUE) {
 		//nothing else to do
 		return;
 	}
 	
 	au_description.componentType          = kAudioUnitType_Output;
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
 	au_description.componentSubType       = kAudioUnitSubType_VoiceProcessingIO;
+#else
+	au_description.componentSubType	      =  kAudioUnitSubType_HALOutput;
+#endif
 	au_description.componentManufacturer  = kAudioUnitManufacturer_Apple;
 	au_description.componentFlags         = 0;
 	au_description.componentFlagsMask     = 0;
@@ -382,6 +401,7 @@ static void au_configure(AUData *d) {
 								   );
 	check_auresult(auresult,"kAudioUnitProperty_SetRenderCallback,kAudioUnitScope_Input");
 	
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
 	const Float64 preferredSampleRate = d->rate;//PREFERRED_HW_SAMPLE_RATE; /*optimum to minimize delay, must put a software resampler to deal with 8khz*/
 	
 	auresult=AudioSessionSetProperty(kAudioSessionProperty_PreferredHardwareSampleRate
@@ -406,6 +426,7 @@ static void au_configure(AUData *d) {
 	
 	
 	if (auresult != 0) ms_message("kAudioSessionProperty_PreferredHardwareIOBufferDuration returns %i ",auresult);
+#endif
 	
 	Float64 delay;
 	UInt32 delaySize = sizeof(delay);
@@ -428,6 +449,8 @@ static void au_configure(AUData *d) {
 	
 	
 	ms_message("I/O unit latency [%f], quality [%i]",delay,quality);
+
+#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
 	Float32 hwoutputlatency;
 	UInt32 hwoutputlatencySize=sizeof(hwoutputlatency);
 	auresult=AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareOutputLatency
@@ -452,6 +475,11 @@ static void au_configure(AUData *d) {
 									 ,&hwsamplerate);
 
 	ms_message("current hw output latency [%f] input [%f] iobuf[%f] sample rate [%f]",hwoutputlatency,hwinputlatency,hwiobuf,hwsamplerate);
+#else
+
+	auresult=AudioUnitInitialize(d->io_unit);
+	check_auresult(auresult,"AudioUnitInitialize");
+#endif
 	auresult=AudioOutputUnitStart(d->io_unit);
 	check_auresult(auresult,"AudioOutputUnitStart");
 	d->started=TRUE;
@@ -666,4 +694,5 @@ void ms_au_register_card() {
 	 * register audio unit plugin should be move to linphone code
 	 */
 	ms_snd_card_manager_register_desc(ms_snd_card_manager_get(),&au_card_desc);
-}	
+}
+