Method android_OpenAudioDevice

src/android/openslesSource.cpp:482–560

open the android audio device for input and/or output

// open the android audio device for input and/or output
opensl_stream2 * cOpenslesSource::android_OpenAudioDevice(int sr,
    int inchannels, int outchannels, int bufferSize,
    bool openPlay, bool openRecord) {
  opensl_stream2 *p;
  p = (opensl_stream2 *) calloc(sizeof(opensl_stream2), 1);
  p->hasNewInputData_ = 0;
  p->hasNewInternalData_ = 0;
  if (bufferSize <= 0) {
    SMILE_IERR(1, "bufferSize must be > 0 in android_OpenAudioDevice()");
    android_CloseAudioDevice(p);
    return NULL;
  }
  smileCondCreate(p->recorderCondition_);
  smileCondCreate(p->playerCondition_);
  smileMutexCreate(p->newDataMutex_);
  p->sr = sr;  // sampling rate assignment
  if (openRecord) {
    p->inchannels = inchannels;
    p->inBufSamples = bufferSize * inchannels;
    p->inBufMSeconds = (int)floor(audioBuffersize_sec_ * 1000.0);  // TODO: compute from bufferSize and sample period!
    SMILE_IMSG(1, "audioBuffersize_sec_ %i",p->inBufMSeconds);
    if (p->inBufSamples != 0) {
      for (int i = 0; i < NUM_RECORDING_BUFFERS; ++i) {
        p->deviceInputBuffers[i] = (int16_t *)calloc(p->inBufSamples, sizeof(int16_t));
        if (p->deviceInputBuffers[i] == NULL) {
          SMILE_IERR(1, "Failed to allocate device audio recording buffer memory # %i.", i);
          android_CloseAudioDevice(p);
          return NULL;
        }
      }
      for (int i = 0; i < NUM_RECORDING_DBL_BUFFERS; ++i) {
        p->internalInputBuffers[i] = (int16_t *)calloc(p->inBufSamples, sizeof(int16_t));
        if (p->internalInputBuffers[i] == NULL) {
          SMILE_IERR(1, "Failed to allocate internal audio recording buffer memory # %i.", i);
          android_CloseAudioDevice(p);
          return NULL;
        }
      }
    }
  }
  if (openPlay) {
    p->outchannels = outchannels;
    p->outBufSamples = bufferSize * outchannels;
    if (p->outBufSamples != 0) {
      for (int i = 0; i < NUM_PLAYBACK_BUFFERS; ++i) {
        p->deviceOutputBuffers[i] = (int16_t *)calloc(p->outBufSamples, sizeof(int16_t));
        if (p->deviceOutputBuffers[i] == NULL) {
          SMILE_IERR(1, "Failed to allocate audio playback buffer memory # %i.", i);
          android_CloseAudioDevice(p);
          return NULL;
        }
      }
    }
    p->currentDeviceOutputBuffer = 0;
  }

  if (openSLCreateEngine(p) != SL_RESULT_SUCCESS) {
    SMILE_IERR(2, "Failed to create openSL engine.");