CMSampleBufferRef与byte*互相转换(audio)

byte*转CMSampleBufferRef

-(AudioStreamBasicDescription) getAudioFormat{

    AudioStreamBasicDescription format;

    format.mSampleRate = 44100;

    format.mFormatID = kAudioFormatLinearPCM;

    format.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger;

    format.mBytesPerPacket = 2*2;

    format.mFramesPerPacket = 1;

    format.mBytesPerFrame = 2*2;

    format.mChannelsPerFrame = 2;

    format.mBitsPerChannel = 16;

    format.mReserved = 0;

    

    return format;

}

- (CMSampleBufferRef)createAudioSample:(void *)audioData frames:(UInt32)len

{

    int channels = 2;

    AudioBufferList audioBufferList;

    audioBufferList.mNumberBuffers = 1;

    audioBufferList.mBuffers[0].mNumberChannels=channels;

    audioBufferList.mBuffers[0].mDataByteSize=len;

    audioBufferList.mBuffers[0].mData = audioData;

    

    AudioStreamBasicDescription asbd = [self getAudioFormat];

    

    CMSampleBufferRef buff = NULL;

    static CMFormatDescriptionRef format = NULL;

    

    CMTime time = CMTimeMake(len/2 , 44100);

    CMSampleTimingInfo timing = {CMTimeMake(1,44100), time, kCMTimeInvalid };

    

    OSStatus error = 0;

    if(format == NULL)

        error = CMAudioFormatDescriptionCreate(kCFAllocatorDefault, &asbd, 0, NULL, 0, NULL, NULL, &format);

    

    error = CMSampleBufferCreate(kCFAllocatorDefault, NULL, false, NULL, NULL, format, len/(2*channels), 1, &timing, 0, NULL, &buff);

    

    if ( error ) {

        CLS_LOG(@"CMSampleBufferCreate returned error: %ld", (long)error);

        return NULL;

    }

    

    error = CMSampleBufferSetDataBufferFromAudioBufferList(buff, kCFAllocatorDefault, kCFAllocatorDefault, 0, &audioBufferList);

    

    if( error )

    {

        CLS_LOG(@"CMSampleBufferSetDataBufferFromAudioBufferList returned error: %ld", (long)error);

        return NULL;

    }

    

    return buff;

}

CMSampleBufferRef转byte*

-(void) getAudioData: (CMSampleBufferRef)sampleBuffer{

        AudioBufferList audioBufferList;

        CMBlockBufferRef blockBuffer;

        

        CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);

        

        for( int y=0; y<audioBufferList.mNumberBuffers; y++ )

        {

            AudioBuffer audioBuffer = audioBufferList.mBuffers[y];

            void* audio = audioBuffer.mData;//这里获取

        }

        

        CFRelease(blockBuffer);

}