适用于iOS的高级音频队列记录服务库吗？

Question

我正在尝试开发一个关于VOIP的应用程序，

是否有适用于iOS的高级音频队列服务库？

因为我不擅长处理扩展文件名＆＃34; .mm＆＃34;，

使用开源是一个更好的选择。

或有人可以给我一些关于如何从AudioQueueBufferRef获取缓冲区的提示？

理想的方式就像代表一样：

- (void)audioRecorderDidReceivedBuffer:(Buffer) {
    do something for other operations
}

---

• 更新 我发现了一篇关于Using RemoteIO audio unit

  的文章

  也许输入回调就是我需要的。

  

Overvier

     

  
1. 识别音频组件（kAudioUnitType_Output / kAudioUnitSubType_RemoteIO / kAudioUnitManufacturerApple）
  
2. 使用AudioComponentFindNext（NULL，＆amp; descriptionOfAudioComponent）获取AudioComponent，就像您与之工厂一样   获取音频单元
  
3. 使用AudioComponentInstanceNew（ourComponent，＆amp; audioUnit）制作音频单元的实例
  
4. 启用IO进行录制，并可能使用AudioUnitSetProperty
进行播放   
5. 描述AudioStreamBasicDescription结构中的音频格式，并使用AudioUnitSetProperty
应用格式   
6. 使用AudioUnitSetProperty
再次提供录制和可能播放的回调   
7. 分配一些缓冲区
  
8. 初始化音频设备
  
9. 启动音频设备
  
10. 飘柔
  

// Enable IO for recording
UInt32 flag = 1;
status = AudioUnitSetProperty(audioUnit, 
                              kAudioOutputUnitProperty_EnableIO, 
                              kAudioUnitScope_Input, 
                              kInputBus,
                              &flag, 
                              sizeof(flag));



// Set input callback
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit, 
                              kAudioOutputUnitProperty_SetInputCallback, 
                              kAudioUnitScope_Global, 
                              kInputBus, 
                              &callbackStruct, 
                              sizeof(callbackStruct));



//recordingCallback
static OSStatus recordingCallback(void *inRefCon, 
                              AudioUnitRenderActionFlags *ioActionFlags, 
                              const AudioTimeStamp *inTimeStamp, 
                              UInt32 inBusNumber, 
                              UInt32 inNumberFrames, 
                              AudioBufferList *ioData) {

// TODO: Use inRefCon to access our interface object to do stuff
// Then, use inNumberFrames to figure out how much data is available, and make
// that much space available in buffers in an AudioBufferList.

AudioBufferList *bufferList; // <- Fill this up with buffers (you will want to malloc it, as it's a dynamic-length list)

// Then:
// Obtain recorded samples

OSStatus status;

status = AudioUnitRender([audioInterface audioUnit], 
                         ioActionFlags, 
                         inTimeStamp, 
                         inBusNumber, 
                         inNumberFrames, 
                         bufferList);
checkStatus(status);

// Now, we have the samples we just read sitting in buffers in bufferList
DoStuffWithTheRecordedAudio(bufferList);
return noErr;
}

Answer 1

以下是如何从录制中获取音频缓冲区的方法

（参考：http://atastypixel.com/blog/using-remoteio-audio-unit/）

static OSStatus recordingCallback(void *inRefCon, 
                                  AudioUnitRenderActionFlags *ioActionFlags, 
                                  const AudioTimeStamp *inTimeStamp, 
                                  UInt32 inBusNumber, 
                                  UInt32 inNumberFrames, 
                                  AudioBufferList *ioData) {

    // TODO: Use inRefCon to access our interface object to do stuff
    // Then, use inNumberFrames to figure out how much data is available, and make
    // that much space available in buffers in an AudioBufferList.

    AudioBufferList *bufferList; // <- Fill this up with buffers (you will want to malloc it, as it's a dynamic-length list)

    // Then:
    // Obtain recorded samples

    OSStatus status;

    status = AudioUnitRender([audioInterface audioUnit], 
                             ioActionFlags, 
                             inTimeStamp, 
                             inBusNumber, 
                             inNumberFrames, 
                             bufferList);
    checkStatus(status);

    // Now, we have the samples we just read sitting in buffers in bufferList
    DoStuffWithTheRecordedAudio(bufferList);
    return noErr;
}