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利用TheAmazingAudioEngine 调节歌曲eq等

利用TheAmazingAudioEngine 调节歌曲eq等

作者: 听见_73b6 | 来源:发表于2017-07-21 14:03 被阅读0次

TheAmazingAudioEnngine

音频播放

  1. 创建 AEAudioController对象
    <pre>
    self.audioController = [[AEAudioController alloc] initWithAudioDescription:AEAudioStreamBasicDescriptionNonInterleaved16BitStereo inputEnabled:YES];
    </pre>
  2. 创建播放器 AEAudioFilePlayer 对象
    <pre>
    self.bgMusicPlayer = [[AEAudioFilePlayer alloc] initWithURL:[NSURL fileURLWithPath:@""] error:nil];//背景音乐播放器
    self.audioPlayer = [[AEAudioFilePlayer alloc] initWithURL:[NSURL fileURLWithPath:@""] error:nil];
    </pre>
    3.播放

两个声音同时进行混合播放

<pre>
[self.audioController addChannels:@[self.bgMusicPlayer,self.audioPlayer]];
//播放
NSError *error = NULL;
BOOL result = [_audioController start:&error];
if ( !result ) {
NSLog(@"发生错误:%@",error);
}
//暂停播放
[self.audioController stop];
</pre>

调节声音的eq

AEParametricEqFilter
<pre>
AEParametricEqFilter *_eq31HzFilter;
AEParametricEqFilter *_eq62HzFilter;
AEParametricEqFilter *_eq125HzFilter;
AEParametricEqFilter *_eq250HzFilter;
AEParametricEqFilter *_eq500HzFilter;
AEParametricEqFilter *_eq1kFilter;
AEParametricEqFilter *_eq2kFilter;
AEParametricEqFilter *_eq4kFilter;
AEParametricEqFilter *_eq8kFilter;
AEParametricEqFilter *_eq16kFilter;
AEVarispeedFilter *_playbackRateFilter;
</pre>
对各个频率段进行调节
<pre>
[self setupEqFilter:_eq31HzFilter centerFrequency:31 gain:6];
[self setupEqFilter:_eq62HzFilter centerFrequency:62 gain:4];
[self setupEqFilter:_eq125HzFilter centerFrequency:125 gain:0];
[self setupEqFilter:_eq250HzFilter centerFrequency:250 gain:-2];
[self setupEqFilter:_eq500HzFilter centerFrequency:500 gain:-6];
[self setupEqFilter:_eq1kFilter centerFrequency:1000 gain:1];
[self setupEqFilter:_eq2kFilter centerFrequency:2000 gain:4];
[self setupEqFilter:_eq4kFilter centerFrequency:4000 gain:6];
[self setupEqFilter:_eq8kFilter centerFrequency:8000 gain:7];
[self setupEqFilter:_eq16kFilter centerFrequency:16000 gain:9];
</pre>

<pre>

  • (void)setupEqFilter:(AEParametricEqFilter *)eqFilter centerFrequency:(double)centerFrequency gain:(double)gain {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    if ( ![_audioController.filters containsObject:eqFilter] ) {
    for (AEParametricEqFilter *existEqFilter in _eqFilters) {
    if (eqFilter == existEqFilter) {
    [self.audioController addFilter:eqFilter];
    break;
    }
    }
    }
    eqFilter.centerFrequency = centerFrequency;
    eqFilter.qFactor = 1.0;
    eqFilter.gain = gain;
    });
    }

</pre>

保存调节后的声音

<pre>

  • (BOOL)writeFilesNew:(NSArray *)urlsWithSettings controller:(AEAudioController *)audioController options:(NSArray *)options targetFile:(NSString *)targetPath
    {
    // NSMutableArray * optionsNew = [NSMutableArray new];
    if(options)
    {
    for (AEAudioUnitFilter * filter in options) {
    if(![audioController.filters containsObject:filter])
    {
    if([filter isKindOfClass:[AEAudioUnitFilter class]] )
    {
    [audioController addFilter:filter];
    }
    }
    }
    }
    NSTimeInterval duration = 0;
    NSArray * channels = [self getChannelsForUrls:urlsWithSettings longestPlayer:nil duration:&duration];
    BOOL ret = [self renderOffline:channels duration:duration targetFile:targetPath];
    for (AEAudioUnitChannel * item in channels) {
    [item teardown];
    }
    channels = nil;

    return ret;
    }

  • (BOOL)renderOffline:(NSArray *)channels duration:(NSTimeInterval)duration targetFile:(NSString *)targetPath
    {
    const int kBufferLength = 4096;

    Boolean outIsOpen = NO;
    NSError * error = nil;

    [_audioController start:nil];

    AUGraphStop(_audioController.audioGraph);

    AUGraphIsOpen(_audioController.audioGraph, &outIsOpen);

    printf("AUGraph is open:%d\n",outIsOpen);

    [_audioController addChannels:channels];

    NSTimeInterval renderDuration = duration;
    Float64 sampleRate = _audioController.audioDescription.mSampleRate;
    UInt32 lengthInFrames = (UInt32) (renderDuration * sampleRate);

    AudioTimeStamp timeStamp;
    memset (&timeStamp, 0, sizeof(timeStamp));
    timeStamp.mSampleTime = 0;
    timeStamp.mFlags = kAudioTimeStampSampleTimeValid;

    AEAudioFileWriter *audioFileWriter = [[AEAudioFileWriter alloc] initWithAudioDescription:_audioController.audioDescription];

    AudioBufferList *buf = AEAllocateAndInitAudioBufferList(_audioController.audioDescription, kBufferLength);

    //printf("begin to write file:%s",targetPath);

    error = nil;
    [audioFileWriter beginWritingToFileAtPath:targetPath fileType:kAudioFileM4AType error:&error];
    if(error)
    {
    // char * test = [error localizedDescription].UTF8String;
    printf("file writer error:%s",[error localizedDescription].UTF8String);
    // NSLog(@"file writer error:%@",[error localizedDescription]);
    }
    for (UInt64 i = 0; i < lengthInFrames; i += kBufferLength) {
    // printf("**begin render:%f \n",timeStamp.mSampleTime);
    AEAudioControllerRenderMainOutput(_audioController, timeStamp, kBufferLength, buf);

      int temp = buf->mBuffers[0].mDataByteSize / _audioController.audioDescription.mBytesPerFrame;
      if(temp==0)
      {
          printf("buffer length 0,break\n");
          break;
      }
      timeStamp.mSampleTime += kBufferLength;
      
      //        printf("**begin write %llu  length:%d in %u...\n",i,kBufferLength,(unsigned int)lengthInFrames);
      OSStatus status = AEAudioFileWriterAddAudioSynchronously(audioFileWriter, buf, kBufferLength);
      //        OSStatus status = AEAudioFileWriterAddAudio(audioFileWriter, buf, kBufferLength);
      if (status != noErr) {
          printf("ERROR\n");
      }
      else
          printf("ok \n");
    

    }
    [audioFileWriter finishWriting];
    AEFreeAudioBufferList(buf);

    // PP_RELEASE(audioFileWriter);

    AUGraphStart(_audioController.audioGraph);

    [_audioController removeChannels:channels];

    [_audioController stop];

    printf("Finished\n");

    NSMutableDictionary *dict = [self.recordList[0] mutableCopy];

dict[@"audioPath"] = targetPath;

[self.recordList removeAllObjects];
[self.recordList addObject:dict];
[self mixBackMusic];
return YES;

}

pragma mark - ae

  • (NSArray *)getChannelsForUrls:(NSArray *)urlsWithSettings longestPlayer:(AEAudioFilePlayer **)longestPlayer duration:(NSTimeInterval *)durationTotal
    {
    NSMutableArray * channels = [NSMutableArray new];
    NSTimeInterval longestTime = 0;
    if(!urlsWithSettings) return channels;

    for (NSDictionary * item in urlsWithSettings) {
    NSError * error = nil;
    NSURL * url = [item objectForKey:@"url"];
    CGFloat startSeconds = 0;
    CGFloat duration = 0;
    if([item objectForKey:@"start"])
    startSeconds = [[item objectForKey:@"start"]floatValue];
    if(startSeconds <0) startSeconds = 0;

      CGFloat vol = 1;
      if([item objectForKey:@"vol"])
          vol = [[item objectForKey:@"vol"]floatValue];
      
      if([item objectForKey:@"duration"])
      {
          duration = [[item objectForKey:@"duration"]floatValue];
      }
      
      AEAudioFilePlayer *aePlayer = [[AEAudioFilePlayer alloc] initWithURL:url error:&error];
      if(error)
      {
          NSLog(@"load player failure:%@",[error localizedDescription]);
          continue;
      }
      aePlayer.volume = vol;
      //        aePlayer.loop = YES;
      if(startSeconds>0)
      {
          [aePlayer setRegionStartTime:startSeconds];
      }
      else
          startSeconds = 0;
      
      //计算播放时长
      if(duration>0)
      {
          if(duration < aePlayer.duration - startSeconds)
          {
              [aePlayer setRegionDuration:duration];
          }
          else
          {
              duration = aePlayer.duration - startSeconds;
          }
      }
      else
          duration = aePlayer.duration - startSeconds;
      
      
      if(longestTime < duration)
      {
          longestTime = duration;
          if(longestPlayer)
          {
              *longestPlayer = aePlayer;
          }
      }
      [channels addObject:aePlayer];
    

    }
    if(durationTotal)
    {
    *durationTotal = longestTime;
    }
    return channels;
    }

</pre>

调节 TheAmazingAudioEngine中有很多可以调节很多音效

<pre>
AEDelayFilter
AEDistortionFilter
AEDynamicsProcessorFilter
AEExpanderFilter
AEHighPassFilter
AEHighShelfFilter
AELimiterFilter
AELowPassFilter
AELowShelfFilter
AENewTimePitchFilter
AEPeakLimiterFilter
AEParametricEqFilter
AEReverbFilter
AEVarispeedFilter
</pre>
等等等等 调节方法和eq类似。。。

希望能帮到你。

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