[RK3399][Android7.1] 调试笔记 --- 兼容思必驰语音识别模块到系统中

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/kris_fei/article/details/86512844

Platform: RK3399
OS: Android 7.1
Kernel: v4.4.83

需求：

使用思必驰的方案做语音识别功能，并且不影响普通的麦克风录音功能。

---

分析：

由于speech也是用的内置mic设备(软件中)，这样和会系统使用的录音设备冲突，导致audio policy中的input profile只有一个有效。 因此两种方法解决此问题：
1.修改speech使用的设备
2.修改系统自身使用的设备

这里使用后者，相对来说方便并且可控一些。

---

解决方法：

Framework改动：

kris@eco:~/rk3399/frameworks/av$ g df
diff --git a/services/audiopolicy/enginedefault/src/Engine.cpp b/services/audiopolicy/enginedefault/src/Engine.cpp
index a091512..abff1b7 100755
--- a/services/audiopolicy/enginedefault/src/Engine.cpp
+++ b/services/audiopolicy/enginedefault/src/Engine.cpp
@@ -605,7 +605,11 @@ audio_devices_t Engine::getDeviceForInputSource(audio_source_t inputSource) cons
         device = AUDIO_DEVICE_IN_WIRED_HEADSET;
     } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_DEVICE) {
         device = AUDIO_DEVICE_IN_USB_DEVICE;
-    } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
+    //Kris,  190116, merge Speech module into audio framework. {
+    }  else if (availableDeviceTypes & AUDIO_DEVICE_IN_BACK_MIC) {
+            device = AUDIO_DEVICE_IN_BACK_MIC;
+    //Kris,  190116, merge Speech module into audio framework. }
+    }  else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
         device = AUDIO_DEVICE_IN_BUILTIN_MIC;
     }
     break;

HAL层改动：

kris@eco:~/rk3399/hardware/rockchip/audio$ g df 0fbb25860bb656abc420f06b902255d749ba0952 a0a3a771928a973b03d9ef6adc3e7d7685264448
diff --git a/tinyalsa_hal/audio_hw.c b/tinyalsa_hal/audio_hw.c
index e1fb819..c7c244d 100755
--- a/tinyalsa_hal/audio_hw.c
+++ b/tinyalsa_hal/audio_hw.c
@@ -338,7 +338,13 @@ uint32_t getInputRouteFromDevice(uint32_t device)
     }*/
     ALOGE("%s:device:%x",__FUNCTION__,device);
     switch (device) {
+//Kris,  190116, merge Speech module into audio framework. {
+#if 0
     case AUDIO_DEVICE_IN_BUILTIN_MIC:
+#else
+    case AUDIO_DEVICE_IN_BACK_MIC:
+#endif
+//Kris,  190116, merge Speech module into audio framework. }
         return MAIN_MIC_CAPTURE_ROUTE;
     case AUDIO_DEVICE_IN_WIRED_HEADSET:
         return HANDS_FREE_MIC_CAPTURE_ROUTE;

添加speech库：

kris@eco:~/rk3399/device/rockchip/rk3399$ g df
diff --git a/device.mk b/device.mk
index 5d8ced7..5dd0ffd 100644
--- a/device.mk
+++ b/device.mk
@@ -303,6 +303,12 @@ PRODUCT_COPY_FILES += \
        device/rockchip/rk3399/ril/lib/libreference-ril.so:system/lib/libreference-ril.so \
        device/rockchip/rk3399/ril/lib64/libreference-ril.so:system/lib64/libreference-ril.so
 
+#Kris,  190116, merge Speech module into audio framework.
+PRODUCT_COPY_FILES += \
+       device/rockchip/rk3399/aispeech/etc/aispeech_rk3399_ecovacs.bin:system/etc/aispeech_rk3399_ecovacs.bin \
+       device/rockchip/rk3399/aispeech/etc/AEC_ch8-2-ch6_2ref.bin:system/etc/AEC_ch8-2-ch6_2ref.bin \
+       device/rockchip/rk3399/aispeech/lib/arm/audio.aispeech.default.so:system/lib/hw/audio.aispeech.default.so \
+       device/rockchip/rk3399/aispeech/lib/arm64/audio.aispeech.default.so:system/lib64/hw/audio.aispeech.default.so

audio policy文件改动：

kris@eco:~/rk3399/device/rockchip/common$ g df
diff --git a/audio_policy_rk30board.conf b/audio_policy_rk30board.conf
index 84315ad..a095d7b 100755
--- a/audio_policy_rk30board.conf
+++ b/audio_policy_rk30board.conf
@@ -5,7 +5,7 @@
 global_configuration {
   attached_output_devices AUDIO_DEVICE_OUT_SPEAKER
   default_output_device AUDIO_DEVICE_OUT_SPEAKER
-  attached_input_devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_REMOTE_SUBMIX
+  attached_input_devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_REMOTE_SUBMIX|AUDIO_DEVICE_IN_BACK_MIC
 }
 
 # audio hardware module section: contains descriptors for all audio hw modules present on the
@@ -50,7 +50,17 @@ audio_hw_modules {
         sampling_rates 8000|11025|16000|22050|32000|44100|48000
         channel_masks AUDIO_CHANNEL_IN_MONO|AUDIO_CHANNEL_IN_STEREO
         formats AUDIO_FORMAT_PCM_16_BIT
-        devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET|AUDIO_DEVICE_IN_WIRED_HEADSET
+        devices AUDIO_DEVICE_IN_BACK_MIC|AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET|AUDIO_DEVICE_IN_WIRED_HEADSET
+      }
+    }
+  }
+  aispeech {
+    inputs {
+      aispeech {
+        sampling_rates 8000|16000|32000|44100|48000|128000
+        channel_masks AUDIO_CHANNEL_IN_MONO|AUDIO_CHANNEL_IN_STEREO
+        formats AUDIO_FORMAT_PCM_16_BIT
+        devices AUDIO_DEVICE_IN_BUILTIN_MIC
       }
     }
   }