Platform: Rk3329

OS: Android 10.0

Kernel: v4.19.111

问题现象

在开发完音频驱动 rk817 后，上层APP调用通道切换接口 mAudioManager.setSpeakerphoneOn(), 发现无效，

一直未切换成功，通道始终在麦克风上。

问题排查

开始先从 setSpeakerphoneOn 入手，跟踪

frameworks/base/services/core/java/com/android/server/audio/AudioService.java

frameworks/base/services/core/java/com/android/server/audio/AudioDeviceBroker.java

日志打印 framework 层是ok的，向jni传递通道数据正常。

system_process D/cck: on=true eventSource=setSpeakerphoneOn(true) from u/pid:1000/2841

system_process D/cck: mForcedUseForComm=1

system_process I/cck: time=847700

system_process D/cck: time=847700

system_process E/cck: MSG_IIL_SET_FORCE_USE arr

system_process D/cck: useCase=0 config=1

system_process D/cck: eventSource=setSpeakerphoneOn(true) from u/pid:1000/2841

system_process I/cck: time=852780

system_process D/cck: time=852780

system_process D/cck: on=false eventSource=setSpeakerphoneOn(false) from u/pid:1000/2841

system_process D/cck: mForcedUseForComm=0

system_process I/cck: time=852782

system_process D/cck: time=852782

system_process E/cck: MSG_IIL_SET_FORCE_USE arr

system_process D/cck: useCase=0 config=0

system_process D/cck: eventSource=setSpeakerphoneOn(false) from u/pid:1000/2841

向下寻找到hal层，hardware/rockchip/audio/tinyalsa_hal/

日志打印如下

听筒

start_output_stream:873 out = 0xf75a8000,device = 0x2,outputs[OUTPUT_HDMI_MULTI] = 0x0

AudioHardwareTiny: out->Device : 0x2

alsa_route: route_pcm_card_open(card 0, route 0)

D/alsa_route: route_info->sound_card 0, route_info->devices 0

D/alsa_route: route_pcm_card_open() INCALL_OFF_ROUTE 26

D/alsa_route: route_set_controls() set route 0

D/AudioHardwareTiny: start_output_stream:968, out = 0xf75a8000

D/alsa_route: route_set_controls() set route 24

免提

start_output_stream:873 out = 0xf75a8000,device = 0x2,outputs[OUTPUT_HDMI_MULTI] = 0x0

/AudioHardwareTiny: out->Device : 0x2

alsa_route: route_pcm_card_open(card 0, route 24)

D/alsa_route: route_info->sound_card 0, route_info->devices 0

D/alsa_route: route_pcm_card_open() INCALL_OFF_ROUTE 26

D/alsa_route: route_set_controls() set route 24

D/AudioHardwareTiny: start_output_stream:968, out = 0xf75a8000

耳机

start_output_stream:873 out = 0xf75a8000,device = 0x4,outputs[OUTPUT_HDMI_MULTI] = 0x0

AudioHardwareTiny: out->Device : 0x4

alsa_route: route_pcm_card_open(card 0, route 14)

D/alsa_route: route_info->sound_card 0, route_info->devices 0

D/alsa_route: route_pcm_card_open() INCALL_OFF_ROUTE 26

D/alsa_route: route_set_controls() set route 14

D/AudioHardwareTiny: start_output_stream:968, out = 0xf75a8000

发现耳机 device 类型是正确的，听筒和免提切换时 device 并未改变，alsa route 打印 只找到 set route 0 和 route 24

AUDIO_DEVICE_OUT_EARPIECE = 0x1, // 听筒

AUDIO_DEVICE_OUT_SPEAKER = 0x2, // 扬声器

AUDIO_DEVICE_OUT_WIRED_HEADSET = 0x4, // 线控耳机

据此推测节点配置不对，pull 出设备中 vendor/etc/audio_policy_configuration.xml 查看，其中并

不包含 AUDIO_DEVICE_OUT_EARPIECE 节点，破案了

解决方案

device\rockchip\common\audio_policy_configuration.xml

     <modules>
         <module name="primary" halVersion="2.0">
             <attachedDevices>
+                <item>Earpiece</item>
                 <item>Speaker</item>
             <devicePorts>
+                <devicePort tagName="Earpiece" type="AUDIO_DEVICE_OUT_EARPIECE" role="sink">
+                </devicePort>
                 <devicePort tagName="Speaker" type="AUDIO_DEVICE_OUT_SPEAKER" role="sink">
                 </devicePort>
             <routes>
+                <route type="mix" sink="Earpiece"
+                       sources="primary output"/>
                 <route type="mix" sink="Speaker"
                        sources="primary output"/>

hardware\libhardware_legacy\audio\audio_policy.conf

 # as well as the output device selected by default.
 # Devices are designated by a string that corresponds to the enum in audio.h
 global_configuration {
-  attached_output_devices AUDIO_DEVICE_OUT_SPEAKER
+  attached_output_devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER
   default_output_device AUDIO_DEVICE_OUT_SPEAKER
   attached_input_devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_REMOTE_SUBMIX
 }

hardware\rockchip\audio\tinyalsa_hal\audio_hw.c

unsigned getOutputRouteFromDevice(uint32_t device)
{
    /*if (mMode != AudioSystem::MODE_RINGTONE && mMode != AudioSystem::MODE_NORMAL)
        return PLAYBACK_OFF_ROUTE;
    */
    ALOGD("%s:%d, device = 0x%x",__FUNCTION__,__LINE__, device);
    switch (device) {
+    case AUDIO_DEVICE_OUT_EARPIECE:
+        return EARPIECE_NORMAL_ROUTE; 
     case AUDIO_DEVICE_OUT_SPEAKER:
         return SPEAKER_NORMAL_ROUTE;
static int start_output_stream(struct stream_out *out)
{
    struct audio_device *adev = out->dev;
    int ret = 0;
    int card = (int)SND_OUT_SOUND_CARD_UNKNOWN;
    int device = 0;
   if (out->device & (
+             AUDIO_DEVICE_OUT_EARPIECE |
                      AUDIO_DEVICE_OUT_SPEAKER |
                      AUDIO_DEVICE_OUT_WIRED_HEADSET |
                      AUDIO_DEVICE_OUT_WIRED_HEADPHONE |
                      AUDIO_DEVICE_OUT_ALL_SCO)) {
        card = adev->dev_out[SND_OUT_SOUND_CARD_SPEAKER].card;

参考文章

Android音频底层调试-基于tinyalsa

Android 音频tinyalsa开发