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Trying to prevent crash if capture is stopped by onDisconnect or onError...

Closed Sylvain Berfini requested to merge fix/destroy_on_wrong_thread into release/5.2

Trying to prevent crash if capture is stopped by onDisconnect or onError callback that isn't on the same thread

J'essaie de résoudre ce crash qui arrive super souvent : https://play.google.com/console/u/0/developers/9021452841763971947/app/4974848917115858452/vitals/crashes/7580bc019d0b5c1c5158c0bcda66dd26/details?days=28

backtrace:
  #00  pc 0x00000000000ec464  /apex/com.android.runtime/lib64/bionic/libc.so (pthread_mutex_lock+8)
  #01  pc 0x0000000000007168  /data/app/~~ijfCPcR-r7lSmi1KeaEh5g==/org.linphone-6ONLbR8WfaGGpNdGemufWA==/split_config.arm64_v8a.apk (android_camera2_capture_stop(AndroidCamera2Context*)+540)
  #02  pc 0x00000000000293f0  /system/lib64/libcamera2ndk.so (android::acam::CameraDevice::CallbackHandler::onMessageReceived(android::sp<android::AMessage> const&)+932)
  #03  pc 0x0000000000018884  /system/lib64/libstagefright_foundation.so (android::AHandler::deliverMessage(android::sp<android::AMessage> const&)+84)
  #04  pc 0x000000000001e650  /system/lib64/libstagefright_foundation.so (android::AMessage::deliver()+188)
  #05  pc 0x0000000000019bcc  /system/lib64/libstagefright_foundation.so (android::ALooper::loop()+592)
  #06  pc 0x0000000000012170  /system/lib64/libutils.so (android::Thread::_threadLoop(void*)+460)
  #07  pc 0x00000000000beecc  /system/lib64/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+144)
  #08  pc 0x0000000000011960  /system/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+404)
  #09  pc 0x00000000000eb6b0  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+264)
  #10  pc 0x000000000008af4c  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64)

Je viens de voir dans https://android.googlesource.com/platform/frameworks/av/+/master/camera/ndk/impl/ACameraDevice.cpp que les callbacks sont appelées depuis un autre thread:

// Setup looper thread to perfrom device callbacks to app
    mCbLooper = new ALooper;
    mCbLooper->setName("C2N-dev-looper");
    status_t err = mCbLooper->start(
            /*runOnCallingThread*/false,
            /*canCallJava*/       true,
            PRIORITY_DEFAULT);
    if (err != OK) {
        ALOGE("%s: Unable to start camera device callback looper: %s (%d)",
                __FUNCTION__, strerror(-err), err);
        setCameraDeviceErrorLocked(ACAMERA_ERROR_CAMERA_DEVICE);
    }
    mHandler = new CallbackHandler(id);
    mCbLooper->registerHandler(mHandler);

Du coup j'ai essayé de faire comme tu avais fait dans le filtre TextureView d'Android.

Edited by Sylvain Berfini