CMSampleBufferRef ref=[output copyNextSampleBuffer];

        NSLog(@"%@",ref);

        if(ref==NULL)

            break;

        //复制数据到文件

        //读取下一个

        AudioBufferList audioBufferList;

        NSMutableData *data=[[NSMutableData alloc] init];

        CMBlockBufferRef blockBuffer;

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

        NSLog(@"%@",blockBuffer);

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

        {

            AudioBuffer audioBuffer = audioBufferList.mBuffers[y];

            Float32 *frame = (Float32*)audioBuffer.mData;

            [data appendBytes:frame length:audioBuffer.mDataByteSize];

        }

        CFRelease(blockBuffer);

        CFRelease(ref);

        ref=NULL;

        blockBuffer=NULL;

        [data release];