问题描述

iOS 关于audio数据的提取 12C

static void AQInputCallback (void *inUserData

                         AudioQueueRef inAudioQueue                         AudioQueueBufferRef inBuffer                         const AudioTimeStamp *inStartTimeUInt32 inNumPackets                         const AudioStreamPacketDescription * inPacketDesc)

{

getAudioDataText * engine = (__bridge getAudioDataText *) inUserData; //[engine processAudioBuffer:inBuffer withQueue:inAudioQueue];if (inNumPackets > 0){   NSDate *datenow = [NSDate date];    [engine processAudioBuffer:inBuffer withQueue:inAudioQueue];     NSString *timeSp = [NSString stringWithFormat:@""%f"" (CGFloat)[datenow timeIntervalSince1970]];    NSLog(@""---------------%@"" timeSp);}if (engine.aqc.run){    AudioQueueEnqueueBuffer(engine.aqc.queue inBuffer 0 NULL);}

}

• (id) initWithSampleRate:(NSInteger)sampleRate atChannels:(UInt32)channels

{

self = [super init];if (self){    aqc.mDataFormat.mSampleRate = sampleRate;    aqc.mDataFormat.mFormatID = kAudioFormatLinearPCM;    aqc.mDataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;    aqc.mDataFormat.mFramesPerPacket = 1;    aqc.mDataFormat.mChannelsPerFrame = channels;    aqc.mDataFormat.mBitsPerChannel = kBitsPerChannels;    aqc.mDataFormat.mBytesPerPacket = kBytesPerFrame;    aqc.mDataFormat.mBytesPerFrame = kBytesPerFrame;    aqc.frameSize = kFrameSize;    //创建一个录音音频队列对象    AudioQueueNewInput(&aqc.mDataFormat AQInputCallback (__bridge void*)(self) NULL kCFRunLoopCommonModes 0 &aqc.queue);    for (int i=0;i<kNumberBuffers;i++)    {        //请求音频队列对象来分配一个音频队列缓存。        AudioQueueAllocateBuffer(aqc.queue (UInt32)aqc.frameSize &aqc.mBuffers[i]);        //给录音或者回放音频队列的缓存中添加一个缓存数据        AudioQueueEnqueueBuffer(aqc.queue aqc.mBuffers[i] 0 NULL);    }    aqc.recPtr = 0;    aqc.run = 1;    int status = AudioQueueStart(aqc.queue NULL);    NSLog(@""AudioQueueStart = %d"" status);}return self;

}
为什设置的采样率 是44100 但是回调函数里的打印数据的频率只有500次／s？哪位大神给个解决方法 我qq 1353482080