我是AudioUnit和AUGraph服务的新手。 我需要使用这些服务播放单个声音文件。 我从apple的开发者网站下载了MixerHost项目并更改了一些代码。 但是代码现在崩溃了
我新更改的代码是：
#import "JKAudioPlayer.h"
#pragma mark Mixer input bus render callback
//
// Declared as AURenderCallback in AudioUnit/AUComponent.h. See Audio Unit Component Services Reference.
static OSStatus inputRenderCallback (
void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData
) {
soundStructPtr soundStructPointerArray = (soundStructPtr) inRefCon;
UInt32 frameTotalForSound = soundStructPointerArray[inBusNumber].frameCount;
BOOL isStereo = soundStructPointerArray[inBusNumber].isStereo;
AudioUnitSampleType *dataInLeft;
AudioUnitSampleType *dataInRight;
dataInLeft = soundStructPointerArray[inBusNumber].audioDataLeft;
if (isStereo) dataInRight = soundStructPointerArray[inBusNumber].audioDataRight;
AudioUnitSampleType *outSamplesChannelLeft;
AudioUnitSampleType *outSamplesChannelRight;
outSamplesChannelLeft = (AudioUnitSampleType *) ioData->mBuffers[0].mData;
if (isStereo) outSamplesChannelRight = (AudioUnitSampleType *) ioData->mBuffers[1].mData;
UInt32 sampleNumber = soundStructPointerArray[0].sampleNumber;
for (UInt32 frameNumber = 0; frameNumber < inNumberFrames; ++frameNumber) {
outSamplesChannelLeft[frameNumber] = dataInLeft[sampleNumber];
if (isStereo) outSamplesChannelRight[frameNumber] = dataInRight[sampleNumber];
sampleNumber++;
if (sampleNumber >= frameTotalForSound) sampleNumber = 0;
}
soundStructPointerArray[inBusNumber].sampleNumber = sampleNumber;
return noErr;
}
#pragma mark -
#pragma mark Audio route change listener callback
static void audioRouteChangeListenerCallback (
void *inUserData,
AudioSessionPropertyID inPropertyID,
UInt32 inPropertyValueSize,
const void *inPropertyValue
) {
if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return;
JKAudioPlayer *audioObject = (__bridge_transfer JKAudioPlayer *) inUserData;
if (NO == audioObject.isPlaying) {
NSLog (@"Audio route change while application audio is stopped.");
return;
} else {
CFDictionaryRef routeChangeDictionary = inPropertyValue;
CFNumberRef routeChangeReasonRef =
CFDictionaryGetValue (
routeChangeDictionary,
CFSTR (kAudioSession_AudioRouteChangeKey_Reason)
);
SInt32 routeChangeReason;
CFNumberGetValue (
routeChangeReasonRef,
kCFNumberSInt32Type,
&routeChangeReason
);
if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {
NSLog (@"Audio output device was removed; stopping audio playback.");
NSString *MixerHostAudioObjectPlaybackStateDidChangeNotification = @"MixerHostAudioObjectPlaybackStateDidChangeNotification";
[[NSNotificationCenter defaultCenter] postNotificationName: MixerHostAudioObjectPlaybackStateDidChangeNotification object: audioObject];
} else {
NSLog (@"A route change occurred that does not require stopping application audio.");
}
}
}
@implementation JKAudioPlayer
@synthesize monoStreamFormat; // mono format for use in buffer and mixer input for "beats" sound
@synthesize graphSampleRate; // sample rate to use throughout audio processing chain
@synthesize mixerUnit; // the Multichannel Mixer unit
@synthesize playing; // Boolean flag to indicate whether audio is playing or not
@synthesize interruptedDuringPlayback; // Boolean flag to indicate whether audio was playing when an interruption arrived
- (id) init {
self = [super init];
if (!self) return nil;
NSURL *beatsLoop = [[NSBundle mainBundle] URLForResource: @"beatsMono"
withExtension: @"caf"];
sourceURL = (__bridge_retained CFURLRef) beatsLoop;
self.interruptedDuringPlayback = NO;
[self setupAudioSession];
[self setupMonoStreamFormat];
[self readAudioFilesIntoMemory];
[self configureAndInitializeAudioProcessingGraph];
[self enableMixerInput: 0 isOn: YES];
[self setMixerOutputGain:1];
[self setMixerInput: 0 gain:YES];
return self;
}
- (void) setupAudioSession {
AVAudioSession *mySession = [AVAudioSession sharedInstance];
[mySession setDelegate: self];
NSError *audioSessionError = nil;
[mySession setCategory: AVAudioSessionCategoryPlayback
error: &audioSessionError];
if (audioSessionError != nil) {
NSLog (@"Error setting audio session category.");
return;
}
self.graphSampleRate = 44100.0; // Hertz
[mySession setPreferredHardwareSampleRate: graphSampleRate
error: &audioSessionError];
if (audioSessionError != nil) {
NSLog (@"Error setting preferred hardware sample rate.");
return;
}
[mySession setActive: YES
error: &audioSessionError];
if (audioSessionError != nil) {
NSLog (@"Error activating audio session during initial setup.");
return;
}
self.graphSampleRate = [mySession currentHardwareSampleRate];
AudioSessionAddPropertyListener (
kAudioSessionProperty_AudioRouteChange,
audioRouteChangeListenerCallback,
(__bridge void*)self
);
}
- (void) setupMonoStreamFormat {
size_t bytesPerSample = sizeof (AudioUnitSampleType);
monoStreamFormat.mFormatID = kAudioFormatLinearPCM;
monoStreamFormat.mFormatFlags = kAudioFormatFlagsAudioUnitCanonical;
monoStreamFormat.mBytesPerPacket = bytesPerSample;
monoStreamFormat.mFramesPerPacket = 1;
monoStreamFormat.mBytesPerFrame = bytesPerSample;
monoStreamFormat.mChannelsPerFrame = 1; // 1 indicates mono
monoStreamFormat.mBitsPerChannel = 8 * bytesPerSample;
monoStreamFormat.mSampleRate = graphSampleRate;
}
- (void) readAudioFilesIntoMemory {
ExtAudioFileRef audioFileObject = 0;
OSStatus result = ExtAudioFileOpenURL (sourceURL, &audioFileObject);
if (noErr != result || NULL == audioFileObject) {NSLog(@"error ext audiofile open url %ld",result); return;}
UInt64 totalFramesInFile = 0;
UInt32 frameLengthPropertySize = sizeof (totalFramesInFile);
result = ExtAudioFileGetProperty (
audioFileObject,
kExtAudioFileProperty_FileLengthFrames,
&frameLengthPropertySize,
&totalFramesInFile
);
if (noErr != result) {NSLog(@"ExtAudioFileGetProperty (audio file length in frames %ld",result); return;}
soundStruct.frameCount = totalFramesInFile;
AudioStreamBasicDescription fileAudioFormat = {0};
UInt32 formatPropertySize = sizeof (fileAudioFormat);
result = ExtAudioFileGetProperty (
audioFileObject,
kExtAudioFileProperty_FileDataFormat,
&formatPropertySize,
&fileAudioFormat
);
if (noErr != result) {NSLog( @"ExtAudioFileGetProperty (file audio format)%ld",result); return;}
UInt32 channelCount = fileAudioFormat.mChannelsPerFrame;
soundStruct.audioDataLeft =
(AudioUnitSampleType *) calloc (totalFramesInFile, sizeof (AudioUnitSampleType));
AudioStreamBasicDescription importFormat = {0};
if (1 == channelCount) {
soundStruct.isStereo = NO;
importFormat = monoStreamFormat;
} else {
NSLog (@"*** WARNING: File format not supported - wrong number of channels");
ExtAudioFileDispose (audioFileObject);
return;
}
result = ExtAudioFileSetProperty (
audioFileObject,
kExtAudioFileProperty_ClientDataFormat,
sizeof (importFormat),
&importFormat
);
if (noErr != result) {NSLog( @"ExtAudioFileSetProperty (client data format %ld", result); return;}
AudioBufferList *bufferList;
bufferList = (AudioBufferList *) malloc (
sizeof (AudioBufferList) + sizeof (AudioBuffer) * (channelCount - 1)
);
if (NULL == bufferList) {NSLog (@"*** malloc failure for allocating bufferList memory"); return;}
bufferList->mNumberBuffers = channelCount;
AudioBuffer emptyBuffer = {0};
size_t arrayIndex;
for (arrayIndex = 0; arrayIndex < channelCount; arrayIndex++) {
bufferList->mBuffers[arrayIndex] = emptyBuffer;
}
bufferList->mBuffers[0].mNumberChannels = 1;
bufferList->mBuffers[0].mDataByteSize = totalFramesInFile * sizeof (AudioUnitSampleType);
bufferList->mBuffers[0].mData = soundStruct.audioDataLeft;
if (2 == channelCount) {
bufferList->mBuffers[1].mNumberChannels = 1;
bufferList->mBuffers[1].mDataByteSize = totalFramesInFile * sizeof (AudioUnitSampleType);
bufferList->mBuffers[1].mData = soundStruct.audioDataRight;
}
UInt32 numberOfPacketsToRead = (UInt32) totalFramesInFile;
result = ExtAudioFileRead (
audioFileObject,
&numberOfPacketsToRead,
bufferList
);
free (bufferList);
if (noErr != result) {
NSLog( @"ExtAudioFileRead failure - %ld " , result);
free (soundStruct.audioDataLeft);
soundStruct.audioDataLeft = 0;
if (2 == channelCount) {
free (soundStruct.audioDataRight);
soundStruct.audioDataRight = 0;
}
ExtAudioFileDispose (audioFileObject);
return;
}
NSLog (@"Finished reading file into memory");
soundStruct.sampleNumber = 0;
ExtAudioFileDispose (audioFileObject);
}
- (void) configureAndInitializeAudioProcessingGraph {
NSLog (@"Configuring and then initializing audio processing graph");
OSStatus result = noErr;
result = NewAUGraph (&processingGraph);
if (noErr != result) {[self printErrorMessage: @"NewAUGraph" withStatus: result]; return;}
// I/O unit
AudioComponentDescription iOUnitDescription;
iOUnitDescription.componentType = kAudioUnitType_Output;
iOUnitDescription.componentSubType = kAudioUnitSubType_RemoteIO;
iOUnitDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
iOUnitDescription.componentFlags = 0;
iOUnitDescription.componentFlagsMask = 0;
// Multichannel mixer unit
AudioComponentDescription MixerUnitDescription;
MixerUnitDescription.componentType = kAudioUnitType_Mixer;
MixerUnitDescription.componentSubType = kAudioUnitSubType_MultiChannelMixer;
MixerUnitDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
MixerUnitDescription.componentFlags = 0;
MixerUnitDescription.componentFlagsMask = 0;
//............................................................................
// Add nodes to the audio processing graph.
NSLog (@"Adding nodes to audio processing graph");
AUNode iONode; // node for I/O unit
AUNode mixerNode; // node for Multichannel Mixer unit
// Add the nodes to the audio processing graph
result = AUGraphAddNode (
processingGraph,
&iOUnitDescription,
&iONode);
if (noErr != result) {[self printErrorMessage: @"AUGraphNewNode failed for I/O unit" withStatus: result]; return;}
result = AUGraphAddNode (
processingGraph,
&MixerUnitDescription,
&mixerNode
);
if (noErr != result) {[self printErrorMessage: @"AUGraphNewNode failed for Mixer unit" withStatus: result]; return;}
result = AUGraphOpen (processingGraph);
if (noErr != result) {[self printErrorMessage: @"AUGraphOpen" withStatus: result]; return;}
result = AUGraphNodeInfo (
processingGraph,
mixerNode,
NULL,
&mixerUnit
);
if (noErr != result) {[self printErrorMessage: @"AUGraphNodeInfo" withStatus: result]; return;}
UInt32 busCount = 2; // bus count for mixer unit input
UInt32 beatsBus = 1; // mixer unit bus 1 will be mono and will take the beats sound
NSLog (@"Setting mixer unit input bus count to: %lu", busCount);
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_ElementCount,
kAudioUnitScope_Input,
0,
&busCount,
sizeof (busCount)
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty (set mixer unit bus count)" withStatus: result]; return;}
UInt32 maximumFramesPerSlice = 4096;
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_MaximumFramesPerSlice,
kAudioUnitScope_Global,
0,
&maximumFramesPerSlice,
sizeof (maximumFramesPerSlice)
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty (set mixer unit input stream format)" withStatus: result]; return;}
for (UInt16 busNumber = 0; busNumber < busCount; ++busNumber) {
// Setup the struture that contains the input render callback
AURenderCallbackStruct inputCallbackStruct;
inputCallbackStruct.inputProc = &inputRenderCallback;
inputCallbackStruct.inputProcRefCon = &soundStruct;
NSLog (@"Registering the render callback with mixer unit input bus %u", busNumber);
// Set a callback for the specified node's specified input
result = AUGraphSetNodeInputCallback (
processingGraph,
mixerNode,
busNumber,
&inputCallbackStruct
);
if (noErr != result) {[self printErrorMessage: @"AUGraphSetNodeInputCallback" withStatus: result]; return;}
}
NSLog (@"Setting mono stream format for mixer unit \"beats\" input bus");
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
beatsBus,
&monoStreamFormat,
sizeof (monoStreamFormat)
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty (set mixer unit beats input bus stream format)" withStatus: result];return;}
NSLog (@"Setting sample rate for mixer unit output scope");
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_SampleRate,
kAudioUnitScope_Output,
0,
&graphSampleRate,
sizeof (graphSampleRate)
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty (set mixer unit output stream format)" withStatus: result]; return;}
NSLog (@"Connecting the mixer output to the input of the I/O unit output element");
result = AUGraphConnectNodeInput (
processingGraph,
mixerNode, // source node
0, // source node output bus number
iONode, // destination node
0 // desintation node input bus number
);
if (noErr != result) {[self printErrorMessage: @"AUGraphConnectNodeInput" withStatus: result]; return;}
CAShow (processingGraph);
result = AUGraphInitialize (processingGraph);
if (noErr != result) {[self printErrorMessage: @"AUGraphInitialize" withStatus: result]; return;}
}
// Start playback
- (void) startAUGraph {
OSStatus result = AUGraphStart (processingGraph);
if (noErr != result) {[self printErrorMessage: @"AUGraphStart" withStatus: result]; return;}
self.playing = YES;
}
// Stop playback
- (void) stopAUGraph {
Boolean isRunning = false;
OSStatus result = AUGraphIsRunning (processingGraph, &isRunning);
if (noErr != result) {[self printErrorMessage: @"AUGraphIsRunning" withStatus: result]; return;}
if (isRunning) {
result = AUGraphStop (processingGraph);
if (noErr != result) {[self printErrorMessage: @"AUGraphStop" withStatus: result]; return;}
self.playing = NO;
}
}
- (void) enableMixerInput: (UInt32) inputBus isOn: (AudioUnitParameterValue) isOnValue {
OSStatus result = AudioUnitSetParameter (
mixerUnit,
kMultiChannelMixerParam_Enable,
kAudioUnitScope_Input,
inputBus,
isOnValue,
0
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetParameter (enable the mixer unit)" withStatus: result]; return;}
}
- (void) setMixerInput: (UInt32) inputBus gain: (AudioUnitParameterValue) newGain {
NSLog(@"mixer input %lu gain %f",inputBus,newGain);
OSStatus result = AudioUnitSetParameter (
mixerUnit,
kMultiChannelMixerParam_Volume,
kAudioUnitScope_Input,
inputBus,
newGain,
0
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetParameter (set mixer unit input volume)" withStatus: result]; return;}
}
- (void) setMixerOutputGain: (AudioUnitParameterValue) newGain {
NSLog(@"mixer output gain %f",newGain);
OSStatus result = AudioUnitSetParameter (
mixerUnit,
kMultiChannelMixerParam_Volume,
kAudioUnitScope_Output,
0,
newGain,
0
);
if (noErr != result) {[self printErrorMessage: @"AudioUnitSetParameter (set mixer unit output volume)" withStatus: result]; return;}
}
- (void) printErrorMessage: (NSString *) errorString withStatus: (OSStatus) result {
char resultString[5];
UInt32 swappedResult = CFSwapInt32HostToBig (result);
bcopy (&swappedResult, resultString, 4);
resultString[4] = '\0';
NSLog (
@"*** %@ error: %@ %@s",
errorString,
(char*) &resultString
);
}
@end
应用程序崩溃
outSamplesChannelLeft [frameNumber] = dataInLeft [sampleNumber]; if（isStereo）outSamplesChannelRight [frameNumber] = dataInRight [sampleNumber]; 我的代码有什么错误 任何人都可以帮助我
答案 0 :(得分：0)
following SO question包含使用音频单元播放单个文件的工作代码（即使在中间使用混音器，您也可能不需要）。虽然问题表明它不起作用，但它对我来说是开箱即用的 - 只需在最后添加一个AUGraphStart(_graph)。它使用AudioFilePlayer单元，无需编写自己的渲染回调。