OpenSL ES无法在Android模拟器上播放音频

Question

我将amrnb解码为PCM，然后将正确的pcm缓冲区放入排队缓冲区（我确定PCM数据是正确的），但没有听到声音。当馈送缓冲区时，日志输出：

/AudioTrack(14857): obtainBuffer timed out (is the CPU pegged?)

我的

代码如下，我的问题是：

1. 当我使用OpenSL ES时有什么问题吗？
2. OpenSL ES真的只在真实设备上工作吗？

示例代码：

void AudioTest()
{    
    StartAudioPlay();
    while(1)
    {
          //decode AMR to PCM
      /* Convert to little endian and write to wav */
          //write buffer to buffer queue     
      AudioBufferWrite(littleendian, 320);
   }
}
void bqPlayerCallback(SLAndroidSimpleBufferQueueItf bq, void *context)
{
//do nothing
}
void AudioBufferWrite(const void* buffer, int size) 
{
    (*gBQBufferQueue)->Enqueue(gBQBufferQueue, buffer, size );
}
// create buffer queue audio player
void SlesCreateBQPlayer(/*AudioCallBackSL funCallback, void *soundMix,*/ int rate, int nChannel, int bitsPerSample ) 
{
    SLresult result;
    // configure audio source
    SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
    SLDataFormat_PCM format_pcm = {SL_DATAFORMAT_PCM, 1, SL_SAMPLINGRATE_8,
        SL_PCMSAMPLEFORMAT_FIXED_16, SL_PCMSAMPLEFORMAT_FIXED_16,
        SL_SPEAKER_FRONT_CENTER, SL_BYTEORDER_LITTLEENDIAN};
    SLDataSource audioSrc = {&loc_bufq, &format_pcm};
    // configure audio sink
    SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, gOutputMixObject};
    SLDataSink audioSnk = {&loc_outmix, NULL};
    // create audio player
    const SLInterfaceID ids[3] = {SL_IID_BUFFERQUEUE, SL_IID_EFFECTSEND, SL_IID_VOLUME};
    const SLboolean req[3] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
    result = (*gEngineEngine)->CreateAudioPlayer(gEngineEngine, &gBQObject, &audioSrc, &audioSnk,
            3, ids, req);
    // realize the player
    result = (*gBQObject)->Realize(gBQObject, SL_BOOLEAN_FALSE);
    // get the play interface
    result = (*gBQObject)->GetInterface(gBQObject, SL_IID_PLAY, &gBQPlay);
    // get the buffer queue interface
    result = (*gBQObject)->GetInterface(gBQObject, SL_IID_BUFFERQUEUE,
            &gBQBufferQueue);
    // register callback on the buffer queue
    result = (*gBQBufferQueue)->RegisterCallback(gBQBufferQueue, bqPlayerCallback, NULL/*soundMix*/);
    // get the effect send interface
    result = (*gBQObject)->GetInterface(gBQObject, SL_IID_EFFECTSEND,
            &gBQEffectSend); 
    // set the player's state to playing
    result = (*gBQPlay)->SetPlayState(gBQPlay, SL_PLAYSTATE_PLAYING );
}

Answer 1

我不

完全确定，但我认为您是对的，因为模拟器的 OpenSL ES 支持实际上不起作用。 我从来没有让它在实践中工作，而它可以在我尝试过的任何设备上工作。

在我的应用程序中，我还必须支持 Android 2.2，所以我有一个回退来使用 JNI 访问 Java AudioTrack API。 我在我的应用程序中添加了一个特殊情况，以便在检测到模拟器时始终使用 AudioTrack 界面。