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 0
AudioUnit 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 function
static 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
