AudioQueue语音流 speex压缩 实时通讯 对讲机

参开 http://blog.csdn.net/liulina603/article/details/19029727    博客有多篇文章  

http://blog.csdn.net/liulina603/article/details/19029163  

http://msching.github.io/blog/2014/07/07/audio-in-ios/   (语音的介绍 共5章   详细)

http://www.cnblogs.com/xuanyuanchen/archive/2012/03/30/xuanyaunchen.html

 http://blog.sina.com.cn/s/blog_59aee7ed010142ih.html

http://billchan.me/

 

AudioQueue几个重要参数

    AudioQueueRef                   inputQueue;//队列
    AudioQueueBufferRef     inputBuffers[3];//缓冲区 可以定义宏容易修改,一般为3个,设置多个可以让语音播放不卡
    AudioStreamBasicDescription     audioDescription;//音频采集参数设置

    ///设置音频参数
    audioDescription.mSampleRate = 8000; //采样率
    audioDescription.mFormatID = kAudioFormatLinearPCM;
    audioDescription.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
    audioDescription.mChannelsPerFrame = 1; ///单声道
    audioDescription.mFramesPerPacket = 1; //每一个packet一侦数据
    audioDescription.mBitsPerChannel = 16; //每个采样点16bit量化
    audioDescription.mBytesPerFrame = (audioDescription.mBitsPerChannel / 8) * audioDescription.mChannelsPerFrame;
    audioDescription.mBytesPerPacket = audioDescription.mBytesPerFrame;

    AudioQueueNewOutput(&audioDescription, AudioPlayerAQInputCallback, (__bridge void*)self, nil, nil, 0, &audioQueue); //使用player的内部线程播放

AudioQueueAllocateBuffer(audioQueue, MIN_SIZE_FRAME, &audioQueueBuffers[i]);//初始化音频缓冲区

AudioQueueStop(audioQueue, true);//停止队列
        AudioQueueReset(audioQueue);//重置队列
    AudioQueueDispose(_inputQueue, true);//销毁队列