Android10以上系统Audio音频遇到播放视频无声时的分析方法

http://aospxref.com/android-10.0.0_r47/xref/frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord/http://aospxref.com/android-11.0.0_r21/xref/frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord/http://aospxref.com/android-12.0.0_r3/xref/frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord/http://aospxref.com/android-13.0.0_r3/xref/frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord/

/frameworks/base/media/java/android/media/AudioManager.java
audiomanager.setmode(AudioManager.MODE_IN_COMMUNICATION)audiomanager.setSpeakerhponeOn(boolean value)

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);int result = audioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);    

class MyService extends Service implements AudioManager.OnAudioFocusChangeListener {    // ....    public void onAudioFocusChange(int focusChange) {        // Do something based on focus change...    }}

AudioManager.setMode(AudioManager.MODE_IN_CALL) //设定为通话中即可
添加权限android.permission.MODIFY_AUDIO_SETTINGS
播放完毕后需要AudioManager.setMode(AudioManager.MODE_NORMAL);

Android 5.0.1audiomanager.setMode(AudioManager.MODE_IN_CALL); //不能生效，即便添加该行仍然从扬声器播出

private class NoisyAudioStreamReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        if (AudioManager.ACTION_AUDIO_BECOMING_NOISY.equals(intent.getAction())) {            // Pause the playback        }    }}
private IntentFilter intentFilter = new IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
private void startPlayback() {    registerReceiver(myNoisyAudioStreamReceiver(), intentFilter);}
private void stopPlayback() {    unregisterReceiver(myNoisyAudioStreamReceiver);}

frameworks/base/services/java/com/android/server/HeadsetObserver.java

hardware/libhardware/modules/audioexternal/bluetooth/bluedroid/audio_a2dp_hw/audio.a2dp.default.sohardware/libhardware/modules/audio/audio.primary.default.sohardware/libhardware/modules/usbaudio/audio.usb.default.so

原文链接:https://www.shuzhiduo.com/A/1O5EDokGJ7/https://blog.csdn.net/thl789/article/details/7423523https://www.shuzhiduo.com/A/Gkz1Lj3GdR/

/hardware/libhardware/modules/audio_remote_submix/audio_hw.cpp785  static ssize_t out_write(struct audio_stream_out *stream, const void* buffer,786                           size_t bytes)

/frameworks/av/services/audiopolicy/managerdefault/AudioPolicyManager.cpp

/frameworks/av/media/libaudioclient/AudioTrack.cpp
326  status_t AudioTrack::set(327          audio_stream_type_t streamType,328          uint32_t sampleRate,329          audio_format_t format,330          audio_channel_mask_t channelMask,331          size_t frameCount,332          audio_output_flags_t flags,333          callback_t cbf,334          void* user,335          int32_t notificationFrames,336          const sp<IMemory>& sharedBuffer,337          bool threadCanCallJava,338          audio_session_t sessionId,339          transfer_type transferType,340          const audio_offload_info_t *offloadInfo,341          uid_t uid,342          pid_t pid,343          const audio_attributes_t* pAttributes,344          bool doNotReconnect,345          float maxRequiredSpeed,346          audio_port_handle_t selectedDeviceId)

/frameworks/base/services/core/java/com/android/server/audio/AudioService.javamVolumeControlStream VolumePanel
/frameworks/base/media/java/android/media/AudioManager.javaVolumePanel

/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
/frameworks/base/media/java/android/media/AudioManager.java2046      public boolean isMusicActive() {2047          return AudioSystem.isStreamActive(STREAM_MUSIC, 0);2048      }

检查Android Audio音频setMode()的默认设置AudioManager.setMode(AudioManager.MODE_NORMAL);

http://aospxref.com/http://androidxref.comhttps://aosp.opersys.comhttps://wiki.lineageos.org/devices/https://wiki.pixelexperience.org/devices/