android 4.4.2 两路录音会导致系统anr,进而崩溃

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先写解法，此方法只支持一路录音，超过一路，应用调用AudioRecord和MediaRecord将会失败

diff --git a/frameworks/av/services/audioflinger/AudioFlinger.cpp b/frameworks/av/services/audioflinger/AudioFlinger.cpp
index 3132e54..f89ba26 100644
--- a/frameworks/av/services/audioflinger/AudioFlinger.cpp
+++ b/frameworks/av/services/audioflinger/AudioFlinger.cpp
@@ -1691,6 +1691,13 @@ audio_io_handle_t AudioFlinger::openInput(audio_module_handle_t module,Mutex::Autolock _l(mLock);+// shanaibing add start, only support one recording
+       if (mRecordThreads.size() > 0) { 
+               ALOGE("openinput unsupport multi record");
+               return 0; 
+       }
+// shanaibing add end  
+inHwDev = findSuitableHwDev_l(module, *pDevices);if (inHwDev == NULL)return 0;

１．针对AudioRecord,在AudioRecorder中native_setup返回错误，导致应用层面new AudioRecorder失败

208     public AudioRecord(int audioSource, int sampleRateInHz, int channelConfig, int audioFormat,
209             int bufferSizeInBytes)
210     throws IllegalArgumentException {...
227         int initResult = native_setup( new WeakReference<AudioRecord>(this),
228                 mRecordSource, mSampleRate, mChannelMask, mAudioFormat, mNativeBufferSizeInBytes,
229                 session);
230         if (initResult != SUCCESS) {
231             loge("Error code "+initResult+" when initializing native AudioRecord object.");
232             return; // with mState == STATE_UNINITIALIZED
233         }
234 ...
238     }

２．针对MediaRecord,相对复杂一些，从android_media_MediaRecorder.cpp中的mr->start看起

347 static void
348 android_media_MediaRecorder_start(JNIEnv *env, jobject thiz)
349 {
350     ALOGV("start");
351     sp<MediaRecorder> mr = getMediaRecorder(env, thiz);
352     process_media_recorder_call(env, mr->start(), "java/lang/RuntimeException", "start failed.");
353 }

直到StagefrightRecorder.cpp中startMPEG4Recording函数中获取输入源失败，

 745 status_t StagefrightRecorder::start() {...757     switch (mOutputFormat) {758         case OUTPUT_FORMAT_DEFAULT:759         case OUTPUT_FORMAT_THREE_GPP:760         case OUTPUT_FORMAT_MPEG_4:761             status = startMPEG4Recording();762             break;...return status;803 }

最终导致process_media_recorder_call抛出异常，从而应用层面调用start方法失败

 

参考：

https://blog.csdn.net/omnispace/article/details/52955556

https://www.cnblogs.com/qiengo/p/4220386.html

https://blog.csdn.net/cuitianxiang/article/details/46989773

https://blog.csdn.net/u012169524/article/details/52938241

https://www.jianshu.com/p/f40157091db3

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