RK audio 拨号同时输出Speaker和USB音频

 

reference： [RK3399][Android7.1]修改系统配置同时输出Speaker和USB音频

　　　　　 Android Audio代码分析 - Audio Strategy

一.Android5.1 音频切换

frameworks\av\services\audiopolicy\AudioPolicyManager.cpp

1.1.策略对应的 stream type 

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AudioPolicyManager::routing_strategy AudioPolicyManager::getStrategy(         audio_stream_type_t stream) {       ALOG_ASSERT(stream != AUDIO_STREAM_PATCH,"getStrategy() called for AUDIO_STREAM_PATCH");       // stream to strategy mapping     switch (stream) {     case AUDIO_STREAM_VOICE_CALL:// 电话来了     case AUDIO_STREAM_BLUETOOTH_SCO:// 蓝牙耳机接通了         return STRATEGY_PHONE;     case AUDIO_STREAM_RING:// 铃声响了     case AUDIO_STREAM_ALARM:// 警告,电池没电时的警告了         return STRATEGY_SONIFICATION;     case AUDIO_STREAM_NOTIFICATION:？// 通知，例如界面中最上面一栏中有消息了         return STRATEGY_SONIFICATION_RESPECTFUL;     case AUDIO_STREAM_DTMF:         return STRATEGY_DTMF;     default:         ALOGE("unknown stream type %d", stream);     case AUDIO_STREAM_SYSTEM:         // NOTE: SYSTEM stream uses MEDIA strategy because muting music and switching outputs         // while key clicks are played produces a poor result     case AUDIO_STREAM_MUSIC:         return STRATEGY_MEDIA;     case AUDIO_STREAM_ENFORCED_AUDIBLE:         return STRATEGY_ENFORCED_AUDIBLE;     case AUDIO_STREAM_TTS:         return STRATEGY_TRANSMITTED_THROUGH_SPEAKER;     case AUDIO_STREAM_ACCESSIBILITY:         return STRATEGY_ACCESSIBILITY;     case AUDIO_STREAM_REROUTING:         return STRATEGY_REROUTING;     } }

1.2.其中添加的判断语句意思为：判断声音是否通话 . isCall 直接返回  SPEAKER和USB_DEVICE

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audio_devices_t AudioPolicyManager::getDeviceForStrategy(routing_strategy strategy,                                                              bool fromCache) {     uint32_t device = AUDIO_DEVICE_NONE;       if (fromCache) {         ALOGVV("getDeviceForStrategy() from cache strategy %d, device %x",               strategy, mDeviceForStrategy[strategy]);         return mDeviceForStrategy[strategy];     }     audio_devices_t availableOutputDeviceTypes = mAvailableOutputDevices.types();     switch (strategy) {       case STRATEGY_TRANSMITTED_THROUGH_SPEAKER:         device = availableOutputDeviceTypes & AUDIO_DEVICE_OUT_SPEAKER;         if (!device) {             ALOGE("getDeviceForStrategy() no device found for "\                     "STRATEGY_TRANSMITTED_THROUGH_SPEAKER");         }         break;       case STRATEGY_SONIFICATION_RESPECTFUL:         if (isInCall()) {             device = getDeviceForStrategy(STRATEGY_SONIFICATION, false /*fromCache*/);         } else if (isStreamActiveRemotely(AUDIO_STREAM_MUSIC,                 SONIFICATION_RESPECTFUL_AFTER_MUSIC_DELAY)) {             // while media is playing on a remote device, use the the sonification behavior.             // Note that we test this usecase before testing if media is playing because             //   the isStreamActive() method only informs about the activity of a stream, not             //   if it's for local playback. Note also that we use the same delay between both tests             device = getDeviceForStrategy(STRATEGY_SONIFICATION, false /*fromCache*/);             //user "safe" speaker if available instead of normal speaker to avoid triggering             //other acoustic safety mechanisms for notification             if (device == AUDIO_DEVICE_OUT_SPEAKER && (availableOutputDeviceTypes & AUDIO_DEVICE_OUT_SPEAKER_SAFE))                 device = AUDIO_DEVICE_OUT_SPEAKER_SAFE;         } else if (isStreamActive(AUDIO_STREAM_MUSIC, SONIFICATION_RESPECTFUL_AFTER_MUSIC_DELAY)) {             // while media is playing (or has recently played), use the same device             device = getDeviceForStrategy(STRATEGY_MEDIA, false /*fromCache*/);         } else {             // when media is not playing anymore, fall back on the sonification behavior             device = getDeviceForStrategy(STRATEGY_SONIFICATION, false /*fromCache*/);             //user "safe" speaker if available instead of normal speaker to avoid triggering             //other acoustic safety mechanisms for notification             if (device == AUDIO_DEVICE_OUT_SPEAKER && (availableOutputDeviceTypes & AUDIO_DEVICE_OUT_SPEAKER_SAFE))                 device = AUDIO_DEVICE_OUT_SPEAKER_SAFE;         }           break; …………………………………………       default:         ALOGW("getDeviceForStrategy() unknown strategy: %d", strategy);         break;     }     ALOGVV("getDeviceForStrategy() strategy %d, device %x", strategy, device);       +   if(isInCall()){ +       ALOGD("Gatsby getDeviceForStrategy() strategy \n"); +       return AUDIO_DEVICE_OUT_SPEAKER | AUDIO_DEVICE_OUT_USB_DEVICE; +   }           return device; }

 二.Android 7.1 音频策略

2.1.media.audio.device_policy media.audio.device_policy 默认音频

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audio_devices_t Engine::getDeviceForStrategyInt(routing_strategy strategy,                                                 DeviceVector availableOutputDevices,                                                 DeviceVector availableInputDevices,                                                 const SwAudioOutputCollection &outputs) const {     uint32_t device = AUDIO_DEVICE_NONE;     uint32_t availableOutputDevicesType = availableOutputDevices.types();       switch (strategy) {   ……………………………………       char value[PROPERTY_VALUE_MAX];     property_get("media.audio.device_policy", value, "");     if (value[0]) {         uint32_t new_device = AUDIO_DEVICE_NONE;         if (strstr(value, "hdmi")) {             ALOGD("set audio policy to hdmi, availableOutputDevicesType : 0x%x", availableOutputDevicesType);             if (availableOutputDevicesType & AUDIO_DEVICE_OUT_HDMI) {                 ALOGD("set audio policy to hdmi succeed");                 new_device |= AUDIO_DEVICE_OUT_HDMI;             }         }         if (strstr(value, "speaker")) {             ALOGD("set audio policy to speaker, availableOutputDevicesType : 0x%x", availableOutputDevicesType);             if (availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER) {                 ALOGD("set audio policy to speaker succeed");                 new_device |= AUDIO_DEVICE_OUT_SPEAKER;             }         }         if (strstr(value, "usb")) {             ALOGD("set audio policy to usb, availableOutputDevicesType : 0x%x", availableOutputDevicesType);             if (availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_DEVICE) {                 ALOGD("set audio policy to usb succeed");                 new_device |= AUDIO_DEVICE_OUT_USB_DEVICE;             }         }         if (strstr(value, "bluetooth")) {             ALOGD("set audio policy to bluetooth, availableOutputDevicesType : 0x%x", availableOutputDevicesType);             if (availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP)                 new_device |= AUDIO_DEVICE_OUT_BLUETOOTH_A2DP;             else if (availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES)                 new_device |= AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES;             else if (availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER)                 new_device |= AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER;         }           if (new_device != AUDIO_DEVICE_NONE) {             device = new_device;         }     }     ALOGVV("getDeviceForStrategy() strategy %d, device %x", strategy, device);     return device; }