iOS实时录音和播放功能

EYRecord.m

#import "ESARecord.h"
#import <AudioToolbox/AudioToolbox.h>

#define QUEUE_BUFFER_SIZE 3   // 输出音频队列缓冲个数
#define kDefaultBufferDurationSeconds 0.03//调整这个值使得录音的缓冲区大小为960,实际会小于或等于960,需要处理小于960的情况
#define kDefaultSampleRate 16000  //定义采样率为16000

extern NSString * const ESAIntercomNotifationRecordString;

static BOOL isRecording = NO;

@interface ESARecord(){
  AudioQueueRef _audioQueue;             //输出音频播放队列
  AudioStreamBasicDescription _recordFormat;
  AudioQueueBufferRef _audioBuffers[QUEUE_BUFFER_SIZE]; //输出音频缓存
}
@property (nonatomic, assign) BOOL isRecording;

@end

@implementation ESARecord

- (instancetype)init
{
  self = [super init];
  if (self) {
    //重置下
    memset(&_recordFormat, 0, sizeof(_recordFormat));
    _recordFormat.mSampleRate = kDefaultSampleRate;
    _recordFormat.mChannelsPerFrame = 1;
    _recordFormat.mFormatID = kAudioFormatLinearPCM;

    _recordFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
    _recordFormat.mBitsPerChannel = 16;
    _recordFormat.mBytesPerPacket = _recordFormat.mBytesPerFrame = (_recordFormat.mBitsPerChannel / 8) * _recordFormat.mChannelsPerFrame;
    _recordFormat.mFramesPerPacket = 1;

    //初始化音频输入队列
    AudioQueueNewInput(&_recordFormat, inputBufferHandler, (__bridge void *)(self), NULL, NULL, 0, &_audioQueue);

    //计算估算的缓存区大小
    int frames = (int)ceil(kDefaultBufferDurationSeconds * _recordFormat.mSampleRate);
    int bufferByteSize = frames * _recordFormat.mBytesPerFrame;

    NSLog(@"缓存区大小%d",bufferByteSize);

    //创建缓冲器
    for (int i = 0; i < QUEUE_BUFFER_SIZE; i++){
      AudioQueueAllocateBuffer(_audioQueue, bufferByteSize, &_audioBuffers[i]);
      AudioQueueEnqueueBuffer(_audioQueue, _audioBuffers[i], 0, NULL);
    }
  }
  return self;
}

-(void)startRecording
{
  // 开始录音
  AudioQueueStart(_audioQueue, NULL);
  isRecording = YES;
}

void inputBufferHandler(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime,UInt32 inNumPackets, const AudioStreamPacketDescription *inPacketDesc)
{
  if (inNumPackets > 0) {
    ESARecord *recorder = (__bridge ESARecord*)inUserData;
    [recorder processAudioBuffer:inBuffer withQueue:inAQ];
  }
  
  if (isRecording) {
    AudioQueueEnqueueBuffer(inAQ, inBuffer, 0, NULL);
  }
}

- (void)processAudioBuffer:(AudioQueueBufferRef )audioQueueBufferRef withQueue:(AudioQueueRef )audioQueueRef
{
  NSMutableData * dataM = [NSMutableData dataWithBytes:audioQueueBufferRef->mAudioData length:audioQueueBufferRef->mAudioDataByteSize];
  
  if (dataM.length < 960) { //处理长度小于960的情况,此处是补00
    Byte byte[] = {0x00};
    NSData * zeroData = [[NSData alloc] initWithBytes:byte length:1];
    for (NSUInteger i = dataM.length; i < 960; i++) {
      [dataM appendData:zeroData];
    }
  }

  // NSLog(@"实时录音的数据--%@", dataM);
  //此处是发通知将dataM 传递出去
  [[NSNotificationCenter defaultCenter] postNotificationName:@"EYRecordNotifacation" object:@{@"data" : dataM}];
}

-(void)stopRecording
{
  if (isRecording)
  {
    isRecording = NO;
    
    //停止录音队列和移除缓冲区,以及关闭session，这里无需考虑成功与否
    AudioQueueStop(_audioQueue, true);
    //移除缓冲区,true代表立即结束录制，false代表将缓冲区处理完再结束
    AudioQueueDispose(_audioQueue, true);
  }
  NSLog(@"停止录音");
}

@end

								 
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