mirror of https://github.com/bsnes-emu/bsnes.git
112 lines
3.6 KiB
Objective-C
112 lines
3.6 KiB
Objective-C
#import <Foundation/Foundation.h>
|
|
#import <AudioToolbox/AudioToolbox.h>
|
|
#import "GBAudioClient.h"
|
|
|
|
static OSStatus render(
|
|
GBAudioClient *self,
|
|
AudioUnitRenderActionFlags *ioActionFlags,
|
|
const AudioTimeStamp *inTimeStamp,
|
|
UInt32 inBusNumber,
|
|
UInt32 inNumberFrames,
|
|
AudioBufferList *ioData)
|
|
|
|
{
|
|
GB_sample_t *buffer = (GB_sample_t *)ioData->mBuffers[0].mData;
|
|
|
|
self.renderBlock(self.rate, inNumberFrames, buffer);
|
|
|
|
return noErr;
|
|
}
|
|
|
|
@implementation GBAudioClient
|
|
{
|
|
AudioComponentInstance audioUnit;
|
|
}
|
|
|
|
-(id) initWithRendererBlock:(void (^)(UInt32 sampleRate, UInt32 nFrames, GB_sample_t *buffer)) block
|
|
andSampleRate:(UInt32) rate
|
|
{
|
|
if (!(self = [super init])) {
|
|
return nil;
|
|
}
|
|
|
|
// Configure the search parameters to find the default playback output unit
|
|
// (called the kAudioUnitSubType_RemoteIO on iOS but
|
|
// kAudioUnitSubType_DefaultOutput on Mac OS X)
|
|
AudioComponentDescription defaultOutputDescription;
|
|
defaultOutputDescription.componentType = kAudioUnitType_Output;
|
|
defaultOutputDescription.componentSubType = kAudioUnitSubType_DefaultOutput;
|
|
defaultOutputDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
|
|
defaultOutputDescription.componentFlags = 0;
|
|
defaultOutputDescription.componentFlagsMask = 0;
|
|
|
|
// Get the default playback output unit
|
|
AudioComponent defaultOutput = AudioComponentFindNext(NULL, &defaultOutputDescription);
|
|
NSAssert(defaultOutput, @"Can't find default output");
|
|
|
|
// Create a new unit based on this that we'll use for output
|
|
OSErr err = AudioComponentInstanceNew(defaultOutput, &audioUnit);
|
|
NSAssert1(audioUnit, @"Error creating unit: %hd", err);
|
|
|
|
// Set our tone rendering function on the unit
|
|
AURenderCallbackStruct input;
|
|
input.inputProc = (void*)render;
|
|
input.inputProcRefCon = (__bridge void * _Nullable)(self);
|
|
err = AudioUnitSetProperty(audioUnit,
|
|
kAudioUnitProperty_SetRenderCallback,
|
|
kAudioUnitScope_Input,
|
|
0,
|
|
&input,
|
|
sizeof(input));
|
|
NSAssert1(err == noErr, @"Error setting callback: %hd", err);
|
|
|
|
AudioStreamBasicDescription streamFormat;
|
|
streamFormat.mSampleRate = rate;
|
|
streamFormat.mFormatID = kAudioFormatLinearPCM;
|
|
streamFormat.mFormatFlags =
|
|
kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked | kAudioFormatFlagsNativeEndian;
|
|
streamFormat.mBytesPerPacket = 4;
|
|
streamFormat.mFramesPerPacket = 1;
|
|
streamFormat.mBytesPerFrame = 4;
|
|
streamFormat.mChannelsPerFrame = 2;
|
|
streamFormat.mBitsPerChannel = 2 * 8;
|
|
err = AudioUnitSetProperty (audioUnit,
|
|
kAudioUnitProperty_StreamFormat,
|
|
kAudioUnitScope_Input,
|
|
0,
|
|
&streamFormat,
|
|
sizeof(AudioStreamBasicDescription));
|
|
NSAssert1(err == noErr, @"Error setting stream format: %hd", err);
|
|
err = AudioUnitInitialize(audioUnit);
|
|
NSAssert1(err == noErr, @"Error initializing unit: %hd", err);
|
|
|
|
self.renderBlock = block;
|
|
_rate = rate;
|
|
|
|
return self;
|
|
}
|
|
|
|
-(void) start
|
|
{
|
|
OSErr err = AudioOutputUnitStart(audioUnit);
|
|
NSAssert1(err == noErr, @"Error starting unit: %hd", err);
|
|
_playing = true;
|
|
|
|
}
|
|
|
|
|
|
-(void) stop
|
|
{
|
|
AudioOutputUnitStop(audioUnit);
|
|
_playing = false;
|
|
}
|
|
|
|
-(void) dealloc
|
|
{
|
|
[self stop];
|
|
AudioUnitUninitialize(audioUnit);
|
|
AudioComponentInstanceDispose(audioUnit);
|
|
}
|
|
|
|
@end
|