1. java层开启开关

peerConnectionParameters =        new PeerConnectionClient.PeerConnectionParameters();

接口中的useOpensles参数设置为true

2. /system/etc/permissions/下新增android.hardware.audio.low_latency.xml文件，内容如下：

< ?xml version="1.0" encoding="utf-8"?> 
         
       
    

ps:webrtc创建不同的音频播放方式源码代码如下：

audio_device_imp.cc文件  int32_t AudioDeviceModuleImpl::CreatePlatformSpecificObjects()接口

if (audioLayer == kPlatformDefaultAudio) {    if (_audioManagerAndroid->IsLowLatencyPlayoutSupported() &&        _audioManagerAndroid->IsLowLatencyRecordSupported()) {      // Use OpenSL ES for both playout and recording.      audioLayer = kAndroidOpenSLESAudio;    } else if (_audioManagerAndroid->IsLowLatencyPlayoutSupported() &&               !_audioManagerAndroid->IsLowLatencyRecordSupported()) {      // Use OpenSL ES for output on devices that only supports the      // low-latency output audio path.      audioLayer = kAndroidJavaInputAndOpenSLESOutputAudio;    } else {      // Use Java-based audio in both directions when low-latency output is      // not supported.      audioLayer = kAndroidJavaAudio;    }  }

判断条件源码在audio_manager.cc

bool AudioManager::IsLowLatencyPlayoutSupported() const {  RTC_DCHECK(thread_checker_.CalledOnValidThread());  ALOGD("IsLowLatencyPlayoutSupported()");  // Some devices are blacklisted for usage of OpenSL ES even if they report  // that low-latency playout is supported. See b/21485703 for details.  return j_audio_manager_->IsDeviceBlacklistedForOpenSLESUsage() ?      false : low_latency_playout_;}