RK系列SDK -- 支持多个录音应用同时使用mic功能

RK SDK：安卓7.1/8.1/9.0
默认情况下，安卓只支持单个录音app使用mic，如果需要多个录音app能同时使用mic，可加下述patch。
修改方案1：
文件：frameworks/av/services/audiopolicy/managerdefault/AudioPolicyManager.cpp

~/frameworks/av/services/audiopolicy/managerdefault$ git diff ./
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index e947c8be0..8c4c8cfff 100755
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -1760,7 +1760,7 @@ audio_io_handle_t AudioPolicyManager::getInputForDevice(audio_devices_t device,
                                                               policyMix, mpClientInterface);

 // FIXME: disable concurrent capture until UI is ready
-#if 0
+#if 1
     // reuse an open input if possible
     sp<AudioInputDescriptor> reusedInputDesc;
     for (size_t i = 0; i < mInputs.size(); i++) {

修改方案二：
文件：frameworks/av/services/audiopolicy/managerdefault/AudioPolicyManager.cpp

diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 504d588..bb9155d 100755
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -16,7 +16,7 @@
 
 #define LOG_TAG "APM_AudioPolicyManager"
 #define LOG_NDEBUG 0
-
+#define ANDROID8_1_SUPPORT_MULIT_CHANNEL_RECORDING
 //#define VERY_VERBOSE_LOGGING
 #ifdef VERY_VERBOSE_LOGGING
 #define ALOGVV ALOGV
@@ -1782,6 +1782,18 @@ audio_io_handle_t AudioPolicyManager::getInputForDevice(audio_devices_t device,
     }
 #endif
 
+#ifdef ANDROID8_1_SUPPORT_MULIT_CHANNEL_RECORDING
+    for (size_t input_index = 0; input_index < mInputs.size(); input_index++) {
+        sp<AudioInputDescriptor> desc;
+        desc = mInputs.valueAt(input_index);
+        if (desc->mProfile == profile) {
+            audioSession->changeActiveCount(1);    // reference count add
+            desc->addAudioSession(session, audioSession);
+            return desc->mIoHandle;
+        }
+    }
+#endif
+
     if (!profile->canOpenNewIo()) {
         return AUDIO_IO_HANDLE_NONE;
     }
@@ -1939,6 +1951,7 @@ status_t AudioPolicyManager::startInput(audio_io_handle_t input,
         *concurrency |= API_INPUT_CONCURRENCY_CAPTURE;
     }
 #else
+#ifndef ANDROID8_1_SUPPORT_MULIT_CHANNEL_RECORDING
     if (!is_virtual_input_device(inputDesc->mDevice)) {
         if (mCallTxPatch != 0 &&
             inputDesc->getModuleHandle() == mCallTxPatch->mPatch.sources[0].ext.device.hw_module) {
@@ -2035,6 +2048,7 @@ status_t AudioPolicyManager::startInput(audio_io_handle_t input,
         }
     }
 #endif
+#endif
 
     // Make sure we start with the correct silence state
     audioSession->setSilenced(silenced);

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