錄音的MP3，而不是CAF文件

我在看這個例子：https://developer.apple.com/library/ios/#samplecode/SpeakHere/Introduction/Intro.html 錄音的MP3，而不是CAF文件

我修改它（AQRecorder.mm）錄製的MP3，而不是CAF文件。我從kAudioFileCAFType更改爲kAudioFileMP3Type，但它不創建該文件。

代碼成爲

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"); 
    } 

}

我錯過任何設置，或有什麼錯我的代碼？，mp3支持來自蘋果 https://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/AudioFileConvertRef/Reference/reference.html

來源

2012-02-22 AMH

AFAIR iOS SDK不允許以MP3格式進行錄製。 AAC錄製是可能的。 – hoha 2012-02-22 16:44:54

但在文檔 – AMH 2012-02-22 16:46:48

中支持它不是 - 您可以*解碼* mp3文件，但不能*編碼*它們。如果你想寫mp3，你將不得不尋找第三方編碼器（並與Frauenhofer/Thompson一起挑選授權） – 2012-02-22 16:59:29

iOS設備不支持以MP3編碼格式錄製。其實，我不認爲任何iOS設備都可以。你必須選擇一種替代格式。核心音頻可以讀取，但不能寫入MP3文件。

來源

2012-02-22 16:56:22

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

您可以使用Lame庫將caf編碼爲mp3文件格式。檢查此示例iOSMp3Recorder

來源

2013-08-01 10:18:25 SBM

錄音的MP3，而不是CAF文件

回答

相關問題