// // OutputCoreAudio.m // Cog // // Created by Zaphod Beeblebrox on 8/2/05. // Copyright 2005 __MyCompanyName__. All rights reserved. // #import "OutputCoreAudio.h" @implementation OutputCoreAudio - (id)initWithController:(id)c { self = [super init]; if (self) { outputController = c; outputUnit = NULL; } return self; } static OSStatus Sound_Renderer(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) { OutputCoreAudio *output = (OutputCoreAudio *)inRefCon; OSStatus err = noErr; void *readPointer = ioData->mBuffers[0].mData; int amountToRead, amountRead; if ([output->outputController shouldContinue] == NO) { DBLog(@"STOPPING"); AudioOutputUnitStop(output->outputUnit); // [output stop]; return err; } amountToRead = inNumberFrames*(output->deviceFormat.mBytesPerPacket); amountRead = [output->outputController readData:(readPointer) amount:amountToRead]; // NSLog(@"Amount read: %i %i", amountRead, [output->outputController endOfStream]); if ((amountRead < amountToRead) && [output->outputController endOfStream] == NO) //Try one more time! for track changes! { int amountRead2; //Use this since return type of readdata isnt known...may want to fix then can do a simple += to readdata amountRead2 = [output->outputController readData:(readPointer+amountRead) amount:amountToRead-amountRead]; amountRead += amountRead2; } // NSLog(@"Amount read: %i", amountRead); ioData->mBuffers[0].mDataByteSize = amountRead; return err; } - (BOOL)setup { DBLog(@"SETUP"); if (outputUnit) [self stop]; ComponentDescription desc; OSStatus err; desc.componentType = kAudioUnitType_Output; desc.componentSubType = kAudioUnitSubType_DefaultOutput; desc.componentManufacturer = kAudioUnitManufacturer_Apple; desc.componentFlags = 0; desc.componentFlagsMask = 0; Component comp = FindNextComponent(NULL, &desc); //Finds an component that meets the desc spec's if (comp == NULL) return NO; err = OpenAComponent(comp, &outputUnit); //gains access to the services provided by the component if (err) return NO; // Initialize AudioUnit err = AudioUnitInitialize(outputUnit); if (err != noErr) return NO; UInt32 size = sizeof (AudioStreamBasicDescription); Boolean outWritable; //Gets the size of the Stream Format Property and if it is writable AudioUnitGetPropertyInfo(outputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &size, &outWritable); //Get the current stream format of the output err = AudioUnitGetProperty (outputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &deviceFormat, &size); if (err != noErr) return NO; // change output format... ///Seems some 3rd party devices return incorrect stuff...or I just don't like noninterleaved data. deviceFormat.mFormatFlags &= ~kLinearPCMFormatFlagIsNonInterleaved; // deviceFormat.mFormatFlags &= ~kLinearPCMFormatFlagIsFloat; // deviceFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger; deviceFormat.mBytesPerFrame = deviceFormat.mChannelsPerFrame*(deviceFormat.mBitsPerChannel/8); deviceFormat.mBytesPerPacket = deviceFormat.mBytesPerFrame * deviceFormat.mFramesPerPacket; // DBLog(@"stuff: %i %i %i %i", deviceFormat.mBitsPerChannel, deviceFormat.mBytesPerFrame, deviceFormat.mBytesPerPacket, deviceFormat.mFramesPerPacket); err = AudioUnitSetProperty (outputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &deviceFormat, size); //Set the stream format of the output to match the input err = AudioUnitSetProperty (outputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &deviceFormat, size); //setup render callbacks renderCallback.inputProc = Sound_Renderer; renderCallback.inputProcRefCon = self; AudioUnitSetProperty(outputUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &renderCallback, sizeof(AURenderCallbackStruct)); [outputController setFormat:&deviceFormat]; DBLog(@"Audio output successfully initialized"); return (err == noErr); } - (void)setVolume:(double)v { AudioUnitSetParameter (outputUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, v * 0.01f, 0); } - (void)start { DBLog(@"START OUTPUT\n"); AudioOutputUnitStart(outputUnit); } - (void)stop { DBLog(@"STOP!"); if (outputUnit) { AudioOutputUnitStop(outputUnit); AudioUnitUninitialize (outputUnit); CloseComponent(outputUnit); } } - (void)dealloc { [self stop]; } - (void)pause { AudioOutputUnitStop(outputUnit); } - (void)resume { AudioOutputUnitStart(outputUnit); } @end