audio unit变声

Audio unit 变声单元

1音频单元类型：kAudioUnitSubType_NewTimePitch;

2 AuGraph单元结构：

 

 

 

 

3 音频参数

48K，单声道，32位宽的convert Unit；(convert Unit_output element 的inputscope和outputscope都设置成48K采样率32位宽)

 

4变声参数

AudioUnitSetParameter(converterUnit3,kNewTimePitchParam_Pitch,kAudioUnitScope_Global, 0, pitchShift, 0);//-2400 -> 2400

 

5播放回调

kAudioUnitProperty_SetRenderCallback 注册在convert_unit上

 

 

Audio unit变速单元

1单元类型：kAudioUnitSubType_NewTimePitch；

2 Augraph单元结构：

 

 

 

3音频参数

48K，单声道，32位宽的convert Unit；

4变声参数

AudioUnitSetParameter(converterUnit3,kNewTimePitchParam_Rate,kAudioUnitScope_Global, 0, pitchShift, 0);//1/32~32 测试0.5倍和2倍正常

 

 

 

 

 

Audio unit 混响单元

1音频单元类型kAudioUnitType_Effect；kAudioUnitSubType_Reverb2；

2 augrap单元结构

 

 

 

3音频参数

48K 单声道，32位宽

（kAudioUnitProperty_StreamFormat,kAudioUnitScope_Input/kAudioUnitScope_Output， OUTPUT_ELEMENT）

 

4混响参数

OSStatus status =AudioUnitSetParameter(aureverbUnit, kAudioUnitScope_Global, 0, kReverb2Param_DryWetMix, 100.0f, 0);//声音效果就像在教室；设置100湿音播放出来的音量会略小；

目前混响设置：AudioUnitSetParameter(aureverbUnit, kAudioUnitScope_Global, 0, kReverb2Param_DecayTimeAt0Hz, 10.0f, 0); 会返回-10877

Init()
{
    
    
      AUGraph YZMpPlayGraph = NULL;

      AUNode YZMnPlayNode = NULL:



    CheckError(NewAUGraph(&YZMpPlayGraph), @" YZMpPlayGraph1", @"fail");
    CheckError(AUGraphOpen(YZMpPlayGraph), @" YZMpPlayGraph2", @"fail");
    
    AudioComponentDescription playDescription;
    playDescription.componentType = kAudioUnitType_Output;
    playDescription.componentSubType = kAudioUnitSubType_RemoteIO;
    playDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
    playDescription.componentFlags = 0;
    playDescription.componentFlagsMask = 0;
    CheckError(AUGraphAddNode(YZMpPlayGraph, &playDescription, &YZMnPlayNode), @" YZMpPlayGraph3 YZMnPlayNode", @"fail");
   
   
   
    AudioComponentDescription EffecAudioDesc;
    EffecAudioDesc.componentType = kAudioUnitType_FormatConverter;
    EffecAudioDesc.componentSubType = kAudioUnitSubType_NewTimePitch;
          
   EffecAudioDesc.componentManufacturer = kAudioUnitManufacturer_Apple;
   EffecAudioDesc.componentFlags = 0;
   EffecAudioDesc.componentFlagsMask = 0;
    
      
  CheckError(AUGraphAddNode(YZMpPlayGraph,&EffecAudioDesc,&ConvNode3), @" YZMpPlayGraph4 conv", @"fail");

  CheckError(AUGraphNodeInfo(YZMpPlayGraph, YZMnPlayNode, NULL, &YZMOut_P_unit), @"YZMpPlayGraph5 YZMnPlayNode YZMOut_P_unit", @"fail");
      
  CheckError(AUGraphNodeInfo(YZMpPlayGraph,ConvNode3,NULL,&ConvUnit3), @" YZMpPlayGraph6 ConvNode3", @"fail");
         ;
   
  
  AUGraphConnectNodeInput(YZMpPlayGraph,ConvNode3,0,YZMnPlayNode,0);
        
    
   SetUnit();
  
   
  
    
}

StartPlay()
{
     CheckError(AUGraphInitialize(YZMpPlayGraph), @"AUGraphInitialize YZMpPlayGraph", @"fail");
    CheckError(AUGraphUpdate(YZMpPlayGraph, NULL), @"AUGraphUpdate YZMpPlayGraph", @"fail");
    CheckError(AUGraphStart(YZMpPlayGraph), @" YZMpPlayGraph start", @"fail");
}

StopPlay()
{
    BooL Running = false;
    AUGraphIsRunning(YZMpPlayGraph, &Running);
    if (Running)
    {
        CheckError(AUGraphStop(YZMpPlayGraph), @" YZMpPlayGraph stop", @"fail");
    }
 
}

RenderCallBack(void *inRefCon,
             AudioUnitRenderActionFlags *ioActionFlags,
             const AudioTimeStamp *inTimeStamp,
             UInt32 inBusNumber,
             UInt32 inNumberFrames,
             AudioBufferList *ioData)
{
     
    CLASSPLAY* playobj = (CLASSPLAY*)inRefCon;
    
    AudioBuffer buffer = ioData->mBuffers[0];
    int bufsize = ioData->mBuffers[0].mDataByteSize;
    
    if (playobj的待播放数据 >= bufsize)
    {
       送给conv的unit的缓冲
    }
    else
    {
       
        memset(buffer.mData, 0, bufsize);
    }
    
    return noErr;
}



SetUnit()
{

    UInt32 flag1 = 1;
    CheckError(AudioUnitSetProperty(YZMOut_P_unit,
                                            kAudioOutputUnitProperty_EnableIO,
                                            kAudioUnitScope_Output,
                                            OUTPUT_ELEMENT,
                                            &flag1,
                                            sizeof(flag1)),
                       @"EnableIO ",
                       @"fail");
    
   
    
   
    //48K
      YZMstPlayFormat.mSampleRate = 48000;

      YZMstPlayFormat.mFormatID = kAudioFormatLinearPCM;
      
      YZMstPlayFormat.mChannelsPerFrame = 1;
      
     YZMstPlayFormat.mFormatFlags     = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked | kAudioFormatFlagIsNonInterleaved;
      
      
      YZMstPlayFormat.mBitsPerChannel  = 32;
      
       YZMstPlayFormat.mBytesPerFrame = (YZMstPlayFormat.mBitsPerChannel)*YZMstPlayFormat.mChannelsPerFrame/8;
      YZMstPlayFormat.mFramesPerPacket = 1;
      YZMstPlayFormat.mBytesPerPacket  =YZMstPlayFormat.mBytesPerFrame * YZMstPlayFormat.mFramesPerPacket;
    
    //conv same with play unit
    YZMstPlayFormat2.mSampleRate =48000;

         YZMstPlayFormat2.mFormatID = kAudioFormatLinearPCM;
         
         YZMstPlayFormat2.mChannelsPerFrame = 1;
         
        YZMstPlayFormat2.mFormatFlags     = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked | kAudioFormatFlagIsNonInterleaved;
         
         
         YZMstPlayFormat2.mBitsPerChannel  = 32;
         
          YZMstPlayFormat2.mBytesPerFrame = (YZMstPlayFormat2.mBitsPerChannel)*YZMstPlayFormat2.mChannelsPerFrame/8;
         YZMstPlayFormat2.mFramesPerPacket = 1;
         YZMstPlayFormat2.mBytesPerPacket  =YZMstPlayFormat2.mBytesPerFrame * YZMstPlayFormat2.mFramesPerPacket;
    
    CheckError(AudioUnitSetProperty(YZMOut_P_unit,
                                            kAudioUnitProperty_StreamFormat,
                                            kAudioUnitScope_Input,
                                            OUTPUT_ELEMENT,
                                            &YZMstPlayFormat2,
                                            sizeof(YZMstPlayFormat2)),
                       @"format1",
                       @"fail");
    
   
    
    
   
    
    CheckError(AudioUnitSetProperty(ConvUnit3,
                                              kAudioUnitProperty_StreamFormat,
                                              kAudioUnitScope_Input,
                                              OUTPUT_ELEMENT,
                                              &YZMstPlayFormat,
                                              sizeof(YZMstPlayFormat)),
                         @"format2",
                         @"fail");
    CheckError(AudioUnitSetProperty(ConvUnit3,
                         kAudioUnitProperty_StreamFormat,
                         kAudioUnitScope_Output,
                         OUTPUT_ELEMENT,
                         &YZMstPlayFormat2,
                         sizeof(YZMstPlayFormat2)),
    @"format3",
    @"fail");
    
 
    
    Float32 pitchShift = 0.5;

    OSStatus status =AudioUnitSetParameter(ConvUnit3, kNewTimePitchParam_Rate, kAudioUnitScope_Global, 0, pitchShift, 0);
      

    AURenderPlaycallback_struct Playcallback_struct;
    Playcallback_struct.inputProc = RenderCallBack;
    Playcallback_struct.inputProcRefCon = this;
    CheckError(AudioUnitSetProperty(ConvUnit3,
                                            kAudioUnitProperty_SetRenderCallback,
                                            kAudioUnitScope_Input,
                                            OUTPUT_ELEMENT,
                                            &Playcallback_struct,
                                            sizeof(Playcallback_struct)),
                       @"callback",
                       @"fail");
    
   
      
}