StackOverflow2013

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POIs there any high level Audio Queue Record Service Library for iOS?
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copied!<p>I'm trying to develop an application which about VOIP,</p> <p>is there any high level audio queue service library for iOS ?</p> <p>because I'm not very good at for working on extension filename ".mm",</p> <p>using an open source would be a better option.</p> <p>or someone could give me some hints for how to fetch the buffer from AudioQueueBufferRef ?</p> <p>the ideal way is like a delegate :</p> <pre><code>- (void)audioRecorderDidReceivedBuffer:(Buffer) { do something for other operations } </code></pre> <hr> <ul> <li><p><strong>Update</strong> I found an article which about <a href="http://atastypixel.com/blog/using-remoteio-audio-unit/" rel="nofollow">Using RemoteIO audio unit</a></p> <p>maybe the input callback is what I need. </p></li> </ul> <blockquote> <p>Overvier</p> <ol> <li>Identify the audio component (kAudioUnitType_Output/ kAudioUnitSubType_RemoteIO/ kAudioUnitManufacturerApple)</li> <li>Use AudioComponentFindNext(NULL, &descriptionOfAudioComponent) to obtain the AudioComponent, which is like the factory with which you obtain the audio unit</li> <li>Use AudioComponentInstanceNew(ourComponent, &audioUnit) to make an instance of the audio unit</li> <li>Enable IO for recording and possibly playback with AudioUnitSetProperty</li> <li>Describe the audio format in an AudioStreamBasicDescription structure, and apply the format using AudioUnitSetProperty</li> <li>Provide a callback for recording, and possibly playback, again using AudioUnitSetProperty</li> <li>Allocate some buffers</li> <li>Initialise the audio unit</li> <li>Start the audio unit</li> <li>Rejoice</li> </ol> </blockquote> <pre><code>// 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; } </code></pre>

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