ios AudioUnit bluetooth 录音 播放 实现

因为拍摄短视频的时候有时候手机离主人比较远的时候，这样录音效果就不好了， 为了方便记录声音，则最好的方式就是使用蓝牙耳机，但是ios关于蓝牙耳机的使用特别少，以下是我总结的内容。

#import "XYRecorder.h"#import <AVFoundation/AVFoundation.h>#define INPUT_BUS 1#define OUTPUT_BUS 0AudioUnit audioUnit;AudioBufferList *buffList;@implementation XYRecorder#pragma mark - init- (instancetype)init {    self = [super init];        if (self) {        AudioUnitInitialize(audioUnit);        [self initRemoteIO];    }        return self;}- (void)initRemoteIO {    [self initAudioSession];        [self initBuffer];        [self initAudioComponent];        [self initFormat];        [self initAudioProperty];        [self initRecordeCallback];        [self initPlayCallback];}- (void)initAudioSession {    NSError *error;    AVAudioSession *audioSession = [AVAudioSession sharedInstance];        [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionAllowBluetooth error:&error];    [audioSession setPreferredSampleRate:44100 error:&error];    [audioSession setPreferredInputNumberOfChannels:1 error:&error];    [audioSession setPreferredIOBufferDuration:0.023 error:&error];}- (void)initBuffer {    UInt32 flag = 0;    AudioUnitSetProperty(audioUnit,                         kAudioUnitProperty_ShouldAllocateBuffer,                         kAudioUnitScope_Output,                         INPUT_BUS,                         &flag,                         sizeof(flag));        buffList = (AudioBufferList*)malloc(sizeof(AudioBufferList));    buffList->mNumberBuffers = 1;    buffList->mBuffers[0].mNumberChannels = 1;        buffList->mBuffers[0].mDataByteSize = 1024 * sizeof(short);    buffList->mBuffers[0].mData = (short *)malloc(sizeof(short) * 1024);}- (void)initAudioComponent {    AudioComponentDescription audioDesc;    audioDesc.componentType = kAudioUnitType_Output;    audioDesc.componentSubType = kAudioUnitSubType_RemoteIO;    audioDesc.componentManufacturer = kAudioUnitManufacturer_Apple;    audioDesc.componentFlags = 0;    audioDesc.componentFlagsMask = 0;        AudioComponent inputComponent = AudioComponentFindNext(NULL, &audioDesc);    AudioComponentInstanceNew(inputComponent, &audioUnit);}- (void)initFormat {    AudioStreamBasicDescription audioFormat;    audioFormat.mSampleRate = 44100;    audioFormat.mFormatID = kAudioFormatLinearPCM;    audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;    audioFormat.mFramesPerPacket = 1;    audioFormat.mChannelsPerFrame = 1;    audioFormat.mBitsPerChannel = 16;    audioFormat.mBytesPerPacket = 2;    audioFormat.mBytesPerFrame = 2;        AudioUnitSetProperty(audioUnit,                         kAudioUnitProperty_StreamFormat,                         kAudioUnitScope_Output,                         OUTPUT_BUS,                         &audioFormat,                         sizeof(audioFormat));    AudioUnitSetProperty(audioUnit,                         kAudioUnitProperty_StreamFormat,                         kAudioUnitScope_Input,                         INPUT_BUS,                         &audioFormat,                         sizeof(audioFormat));}- (void)initRecordeCallback {    AURenderCallbackStruct recordCallback;    recordCallback.inputProc = RecordCallback;    recordCallback.inputProcRefCon = (__bridge void *)self;    AudioUnitSetProperty(audioUnit,                         kAudioOutputUnitProperty_SetInputCallback,                         kAudioUnitScope_Global,                         INPUT_BUS,                         &recordCallback,                         sizeof(recordCallback));}- (void)initPlayCallback {    AURenderCallbackStruct playCallback;    playCallback.inputProc = PlayCallback;    playCallback.inputProcRefCon = (__bridge void *)self;    AudioUnitSetProperty(audioUnit,                         kAudioUnitProperty_SetRenderCallback,                         kAudioUnitScope_Global,                         OUTPUT_BUS,                         &playCallback,                         sizeof(playCallback));}- (void)initAudioProperty {    UInt32 flag = 1;        AudioUnitSetProperty(audioUnit,                         kAudioOutputUnitProperty_EnableIO,                         kAudioUnitScope_Input,                         INPUT_BUS,                         &flag,                         sizeof(flag));    AudioUnitSetProperty(audioUnit,                         kAudioOutputUnitProperty_EnableIO,                         kAudioUnitScope_Input,                         OUTPUT_BUS,                         &flag,                         sizeof(flag));}#pragma mark - callback functionstatic OSStatus RecordCallback(void *inRefCon,                               AudioUnitRenderActionFlags *ioActionFlags,                               const AudioTimeStamp *inTimeStamp,                               UInt32 inBusNumber,                               UInt32 inNumberFrames,                               AudioBufferList *ioData){        AudioUnitRender(audioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, buffList);        short *data = (short *)buffList->mBuffers[0].mData;    NSLog(@"%d %d %d ", buffList->mBuffers[0].mDataByteSize, inBusNumber, inNumberFrames);        return noErr;}static OSStatus PlayCallback(void *inRefCon,                            AudioUnitRenderActionFlags *ioActionFlags,                            const AudioTimeStamp *inTimeStamp,                            UInt32 inBusNumber,                            UInt32 inNumberFrames,                            AudioBufferList *ioData) {//    memcpy(ioData->mBuffers[0].mData, buffList->mBuffers[0].mData, buffList->mBuffers[0].mDataByteSize);    AudioUnitRender(audioUnit, ioActionFlags, inTimeStamp, 1, inNumberFrames, ioData);        return noErr;}#pragma mark - public methods- (void)startRecorder {    AudioOutputUnitStart(audioUnit);}- (void)stopRecorder {    AudioOutputUnitStop(audioUnit);}@end