录音的MP3，而不是CAF文件

我在看这个例子：https://developer.apple.com/library/ios/#samplecode/SpeakHere/Introduction/Intro.html 录音的MP3，而不是CAF文件

我修改它（AQRecorder.mm）录制的MP3，而不是CAF文件。我从kAudioFileCAFType更改为kAudioFileMP3Type，但它不创建该文件。

代码成为

void AQRecorder::SetupAudioFormat(UInt32 inFormatID) 
{ 
    memset(&mRecordFormat, 0, sizeof(mRecordFormat)); 

    UInt32 size = sizeof(mRecordFormat.mSampleRate); 
    XThrowIfError(AudioSessionGetProperty( kAudioSessionProperty_CurrentHardwareSampleRate, 
             &size, 
             &mRecordFormat.mSampleRate), "couldn't get hardware sample rate"); 

    size = sizeof(mRecordFormat.mChannelsPerFrame); 
    XThrowIfError(AudioSessionGetProperty( kAudioSessionProperty_CurrentHardwareInputNumberChannels, 
             &size, 
             &mRecordFormat.mChannelsPerFrame), "couldn't get input channel count"); 

    mRecordFormat.mFormatID = inFormatID; 
    if (inFormatID == kAudioFormatLinearPCM) 
    { 
     // if we want pcm, default to signed 16-bit little-endian 
     mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked; 
     mRecordFormat.mBitsPerChannel = 16; 
     mRecordFormat.mBytesPerPacket = mRecordFormat.mBytesPerFrame = (mRecordFormat.mBitsPerChannel/8) * mRecordFormat.mChannelsPerFrame; 
     mRecordFormat.mFramesPerPacket = 1; 
    } 
} 

void AQRecorder::StartRecord(CFStringRef inRecordFile) 
{ 
    int i, bufferByteSize; 
    UInt32 size; 
    CFURLRef url; 

    try {  
     mFileName = CFStringCreateCopy(kCFAllocatorDefault, inRecordFile); 

     // specify the recording format 
     SetupAudioFormat(kAudioFormatLinearPCM); 

     // create the queue 
     XThrowIfError(AudioQueueNewInput(
             &mRecordFormat, 
             MyInputBufferHandler, 
             this /* userData */, 
             NULL /* run loop */, NULL /* run loop mode */, 
             0 /* flags */, &mQueue), "AudioQueueNewInput failed"); 

     // get the record format back from the queue's audio converter -- 
     // the file may require a more specific stream description than was necessary to create the encoder. 
     mRecordPacket = 0; 

     size = sizeof(mRecordFormat); 
     XThrowIfError(AudioQueueGetProperty(mQueue, kAudioQueueProperty_StreamDescription, 
             &mRecordFormat, &size), "couldn't get queue's format"); 

     NSString *recordFile = [NSTemporaryDirectory() stringByAppendingPathComponent: (NSString*)inRecordFile];  


     NSLog(recordFile); 

     url = CFURLCreateWithString(kCFAllocatorDefault, (CFStringRef)recordFile, NULL); 

     // create the audio file kAudioFileCAFType 
     XThrowIfError(AudioFileCreateWithURL(url, kAudioFileMP3Type, &mRecordFormat, kAudioFileFlags_EraseFile, 
              &mRecordFile), "AudioFileCreateWithURL failed"); 
     CFRelease(url); 

     // copy the cookie first to give the file object as much info as we can about the data going in 
     // not necessary for pcm, but required for some compressed audio 
     CopyEncoderCookieToFile(); 

     // allocate and enqueue buffers 
     bufferByteSize = ComputeRecordBufferSize(&mRecordFormat, kBufferDurationSeconds); // enough bytes for half a second 
     for (i = 0; i < kNumberRecordBuffers; ++i) { 
      XThrowIfError(AudioQueueAllocateBuffer(mQueue, bufferByteSize, &mBuffers[i]), 
         "AudioQueueAllocateBuffer failed"); 
      XThrowIfError(AudioQueueEnqueueBuffer(mQueue, mBuffers[i], 0, NULL), 
         "AudioQueueEnqueueBuffer failed"); 
     } 
     // start the queue 
     mIsRunning = true; 
     XThrowIfError(AudioQueueStart(mQueue, NULL), "AudioQueueStart failed"); 
    } 
    catch (CAXException &e) { 
     char buf[256]; 
     fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf)); 
    } 
    catch (...) { 
     fprintf(stderr, "An unknown error occurred\n"); 
    } 

}

我错过任何设置，或有什么错我的代码？，mp3支持来自苹果 https://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/AudioFileConvertRef/Reference/reference.html

来源

2012-02-22 AMH

AFAIR iOS SDK不允许以MP3格式进行录制。 AAC录制是可能的。 – hoha 2012-02-22 16:44:54

但在文档 – AMH 2012-02-22 16:46:48

中支持它不是 - 您可以*解码* mp3文件，但不能*编码*它们。如果你想写mp3，你将不得不寻找第三方编码器（并与Frauenhofer/Thompson一起挑选授权） – 2012-02-22 16:59:29

iOS设备不支持以MP3编码格式录制。其实，我不认为任何iOS设备都可以。你必须选择一种替代格式。核心音频可以读取，但不能写入MP3文件。

来源

2012-02-22 16:56:22

是的，即使Core Audio for Mac OS X也不支持MP3编码。 – hoha 2012-02-22 17:10:17

您可以使用Lame库将caf编码为mp3文件格式。检查此示例iOSMp3Recorder

来源

2013-08-01 10:18:25 SBM

录音的MP3，而不是CAF文件

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