stopPreview概率性奔溃

[yzq666]

JNI DETECTED ERROR IN APPLICATION: jmethodID was NULL in call to CallVoidMethodV art/runtime/runtime.cc:415] at com.serenegiant.usb.UVCCamera.nativeStopPreview(Native method) art/runtime/runtime.cc:415] at com.serenegiant.usb.UVCCamera.stopPreview(UVCCamera.java:402) art/runtime/runtime.cc:415] - locked <0x01c36057> (a com.serenegiant.usb.UVCCamera) art/runtime/runtime.cc:415] at com.lgh.uvccamera.UVCCameraProxy.stopPreview(UVCCameraProxy.java:421) art/runtime/runtime.cc:415] at com.lgh.uvccamera.UVCCameraProxy$2.onSurfaceTextureDestroyed(UVCCameraProxy.java:216) art/runtime/runtime.cc:415] at android.view.TextureView.destroySurface(TextureView.java:242)

[zzJune]

我也是，怎么办

[sysylcf]

我也是，怎么办

这个问题有解决掉吗？

[lliecho]

我也是，怎么办

这个问题有解决掉吗？

请问有解决掉吗

[jjjjbababy]

JNI DETECTED ERROR IN APPLICATION: obj == null java_vm_ext.cc:542] in call to CallVoidMethodV java_vm_ext.cc:542] "Thread-16" prio=5 tid=14 Runnable java_vm_ext.cc:542] | group="main" sCount=0 dsCount=0 flags=0 obj=0x12f80140 self=0xe4288600 java_vm_ext.cc:542] | sysTid=29872 nice=0 cgrp=default sched=0/0 handle=0xc1a83970 java_vm_ext.cc:542] | state=R schedstat=( 50160416 1144274 97 ) utm=3 stm=1 core=5 HZ=100 java_vm_ext.cc:542] | stack=0xc1988000-0xc198a000 stackSize=1010KB java_vm_ext.cc:542] | held mutexes= "mutator lock"(shared held) java_vm_ext.cc:542] native: #00 pc 002e7713 /system/lib/libart.so (art::DumpNativeStack(std::1::basic_ostream<char, std::__1::char_traits>&, int, BacktraceMap, char const, art::ArtMethod, void, bool)+134) java_vm_ext.cc:542] native: #01 pc 0038d135 /system/lib/libart.so (art::Thread::DumpStack(std::1::basic_ostream<char, std::1::char_traits>&, bool, BacktraceMap*, bool) const+212) java_vm_ext.cc:542] native: #02 pc 00389713 /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::1::char_traits>&, bool, BacktraceMap, bool) const+34) java_vm_ext.cc:542] native: #03 pc 0023a433 /system/lib/libart.so (art::JavaVMExt::JniAbort(char const, char const)+722) java_vm_ext.cc:542] native: #04 pc 000114f0 /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (_JNIEnv::CallVoidMethod(_jobject, _jmethodID, ...)+52) java_vm_ext.cc:542] native: #05 pc 0001140c /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (UVCPreview::do_capture_callback(_JNIEnv, uvc_frame)+244) java_vm_ext.cc:542] native: #06 pc 000110bc /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (UVCPreview::do_capture(_JNIEnv)+144) 04-30 09:26:17.047 28779 29872 F .com.sinoup.mf: java_vm_ext.cc:542] native: #07 pc 00010b04 /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (UVCPreview::capture_thread_func(void)+64) java_vm_ext.cc:542] native: #08 pc 00065413 /system/lib/libc.so (__pthread_start(void)+22) java_vm_ext.cc:542] native: #09 pc 0001e819 /system/lib/libc.so (__start_thread+32) java_vm_ext.cc:542] (no managed stack frames) java_vm_ext.cc:542] runtime.cc:565] Runtime aborting... runtime.cc:565] Dumping all threads without appropriate locks held: thread list lock mutator lock

我是这个报错

[shengjunhu]

JNI DETECTED ERROR IN APPLICATION: obj == null java_vm_ext.cc:542] in call to CallVoidMethodV java_vm_ext.cc:542] "Thread-16" prio=5 tid=14 Runnable java_vm_ext.cc:542] | group="main" sCount=0 dsCount=0 flags=0 obj=0x12f80140 self=0xe4288600 java_vm_ext.cc:542] | sysTid=29872 nice=0 cgrp=default sched=0/0 handle=0xc1a83970 java_vm_ext.cc:542] | state=R schedstat=( 50160416 1144274 97 ) utm=3 stm=1 core=5 HZ=100 java_vm_ext.cc:542] | stack=0xc1988000-0xc198a000 stackSize=1010KB java_vm_ext.cc:542] | held mutexes= "mutator lock"(shared held) java_vm_ext.cc:542] native: #00 pc 002e7713 /system/lib/libart.so (art::DumpNativeStack(std::1::basic_ostream<char, std::__1::char_traits>&, int, BacktraceMap, char const, art::ArtMethod, void, bool)+134) java_vm_ext.cc:542] native: #1 pc 0038d135 /system/lib/libart.so (art::Thread::DumpStack(std::1::basic_ostream<char, std::1::char_traits>&, bool, BacktraceMap*, bool) const+212) java_vm_ext.cc:542] native: #2 pc 00389713 /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::1::char_traits>&, bool, BacktraceMap, bool) const+34) java_vm_ext.cc:542] native: #3 pc 0023a433 /system/lib/libart.so (art::JavaVMExt::JniAbort(char const, char const)+722) java_vm_ext.cc:542] native: #4 pc 000114f0 /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (_JNIEnv::CallVoidMethod(_jobject, _jmethodID, ...)+52) java_vm_ext.cc:542] native: #5 pc 0001140c /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (UVCPreview::do_capture_callback(_JNIEnv, uvc_frame)+244) java_vm_ext.cc:542] native: #6 pc 000110bc /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (UVCPreview::do_capture(_JNIEnv)+144) 04-30 09:26:17.047 28779 29872 F .com.sinoup.mf: java_vm_ext.cc:542] native: #7 pc 00010b04 /data/app/cn.com.sinoup.mfr-mWXPgIIvsx7RMTO4sqrp7g==/lib/arm/libUVCCamera.so (UVCPreview::capture_thread_func(void)+64) java_vm_ext.cc:542] native: #8 pc 00065413 /system/lib/libc.so (__pthread_start(void)+22) java_vm_ext.cc:542] native: #9 pc 0001e819 /system/lib/libc.so (__start_thread+32) java_vm_ext.cc:542] (no managed stack frames) java_vm_ext.cc:542] runtime.cc:565] Runtime aborting... runtime.cc:565] Dumping all threads without appropriate locks held: thread list lock mutator lock

我是这个报错

这是stopview时把setFrameCallback()置空，导致jni层还在使用报空指针，在UVCPreview.cpp中对回调加空判断即可 /**

• call IFrameCallback#onFrame if needs / void UVCPreview::do_capture_callback(JNIEnv env, uvc_frame_t *frame) { ENTER();

  if (LIKELY(frame)) { uvc_frame_t *callback_frame = frame; if (mFrameCallbackObj) { if (mFrameCallbackFunc) { callback_frame = get_frame(callbackPixelBytes); if (LIKELY(callback_frame)) { int b = mFrameCallbackFunc(frame, callback_frame); recycle_frame(frame); if (UNLIKELY(b)) { LOGW("failed to convert for callback frame"); goto SKIP; } } else { LOGW("failed to allocate for callback frame"); callback_frame = frame; goto SKIP; } } jobject buf = env->NewDirectByteBuffer(callback_frame->data, callbackPixelBytes); //Add by shengjunhu for nullpointer if(iframecallback_fields.onFrame) { env->CallVoidMethod(mFrameCallbackObj, iframecallback_fields.onFrame, buf); } env->ExceptionClear(); env->DeleteLocalRef(buf); } SKIP: recycle_frame(callback_frame); } EXIT(); }

[febflyer]

同问，找到解决办法没？

[febflyer]

试了，崩溃问题确实有效，但是还有另一个导致崩溃的问题：内存一直增长，目前还没找到有效的办法

[LucasMoskun]

Could it be a race condition issue -- trying to synchronize the threads at java level? https://stackoverflow.com/questions/10692980/android-synchronization-of-native-thread-with-main-thread

[leach-chen]

这里也有篇帖子讲了 https://blog.csdn.net/hanye2020/article/details/111741630

[ghost]

native 层是异步模式,线程比较多,stopPreview的时候会等待capture线程结束.可能capture线程根本就没有启动或者被阻在其它地方了,导致join崩溃或者无法返回. 我改成同步模式了,可以试试 try this repo: https://github.com/tsinglink/uvccamera test with this apk: https://github.com/tsinglink/uvccamera/releases/download/1.0/simpleuvccamera-release.apk

[yl84321]

native层是异步模式，线程比较多，stopPreview的时候会等待capture线程结束。可能capture线程根本就没有启动或者在其他地方被阻塞了，导致加入崩溃无法或者返回。 我改成了同步模式了，可以试一下尝试 这个repo： https: //github.com/tsinglink/uvccamera 使用这个apk进行测试： https://github.com/tsinglink/uvccamera/releases/download/1.0/simpleuvccamera-release.apk

您好，能看下您是如何修改的吗，这个连接访问不了

[Clark-caipeiyuan]

收到了，谢谢！

[jenny850113]

native 层是异步模式,线程比较多,stopPreview的时候会等待capture线程结束.可能capture线程根本就没有启动或者被阻在其它地方了,导致join崩溃或者无法返回. 我改成同步模式了,可以试试 try this repo: https://github.com/tsinglink/uvccamera test with this apk: https://github.com/tsinglink/uvccamera/releases/download/1.0/simpleuvccamera-release.apk

您好, 請問可否看下如何修改的,link失效了,謝謝!