android - 强制USB音频输出

Question

我有以下代码播放mp3:

audioPlayer = new SuperpoweredAdvancedAudioPlayer(&audioPlayer, playerEventCallbackA, samplerate, 0); 

audioPlayer->open(path, 0, fileLength); 

audioSystem = new SuperpoweredAndroidAudioIO(samplerate, buffersize, false, true, audioProcessing, this, -1, SL_ANDROID_STREAM_MEDIA, 0); 

……………

bool silence = !audioPlayer->process(stereoBuffer, false, numberOfSamples); 

if (!silence) { 

  // The stereoBuffer is ready now, let’s put the finished audio into the requested buffers. 

  SuperpoweredFloatToShortInt(stereoBuffer, output, numberOfSamples); 

 }

而且我有以下代码连接到USB卡:

int r = SuperpoweredUSBSystem::onConnect(deviceID, fd, (unsigned char *) rd, env->GetArrayLength(rawDescriptor)); 

if (r & 1) { 

  SuperpoweredUSBAudio::easyIO(deviceID, 44100, 16, 0, 256, SuperpoweredUSBLatency_Low, this, audioProcessing); 

  }

请帮助我知道- 如何在USB卡上播放来自播放器的声音？

谢谢。

Answer 1

SuperpoweredAndroidAudioIO和SuperpoweredUSBAudio都使用音频回调。将您的播放器代码放入SuperpoweredUSBAudio的音频处理回调中。我看到在您的示例中，这两个回调都称为audioProcessing。