使用ANativeWindow_lock返回错误 -22 与安卓 Gstreamer SDK

USE ANativeWindow_lock return error -22 with android Gstreamer SDK

本文关键字：Gstreamer SDK 错误 ANativeWindow lock 返回 使用      更新时间：2023-10-16

everyone，

现在我正在使用Android Gstreamer SDK来实现流媒体，通过修改 http://docs.gstreamer.com/display/GstSDK/Android+tutorial+3%3A+Video 这个项目，我想在流式传输时捕获图像，所以我添加了一个 JNI 函数来渲染帧，这是我在下面的函数：

void gst_native_render_image(JNIEnv *env, jobject thiz, jobject surface){  
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
         if (!data) 
             return;
         GST_DEBUG ("Releasing Native Window %p", data->native_window);
         ANativeWindow_Buffer buffer;
         //ANativeWindow *window = ANativeWindow_fromSurface(env, surface);
         render_window = ANativeWindow_fromSurface(env, surface);
         ANativeWindow_acquire(render_window);
         //ANativeWindow *window = data->native_window;
         GST_DEBUG("Got window %p", render_window);
         if(render_window > 0){
                 int width = ANativeWindow_getWidth(render_window);
                 int height = ANativeWindow_getHeight(render_window);
                 GST_DEBUG("Got window %d %d", width,height);
                 ANativeWindow_setBuffersGeometry(render_window, width, height, WINDOW_FORMAT_RGBA_8888);
                 memset((void*)&buffer,0,sizeof(buffer));
                 int lockResult = 0;
                 lockResult = ANativeWindow_lock(render_window, &buffer, NULL);
                 if (lockResult == 0) {
                         GST_DEBUG("GStreamer: ANativeWindow_locked");
                         memcpy(buffer.bits, g_buffer,  640*320);
                         ANativeWindow_unlockAndPost(render_window);
                 }
                 else{
                         GST_DEBUG("GStreamer: ANativeWindow_lock failed error %d",lockResult);
                 }
                 GST_DEBUG("Releasing window");
                 ANativeWindow_release(render_window);
                 (*env)->CallVoidMethod(env, thiz, surface_pixel_render_id); // call JAVA method to save the pixel data....oranhuang
         }else {
                 GST_DEBUG("surface is null");
         }
}

但我总是得到返回错误 -22 和 ANativeWindow_lock().

我还需要做什么或以错误的方式使用ANativeWindow_lock()吗????

'因为与ANativeWindow_lock()的讨论很少，我不知道如何修复我的错误消息。

我遇到了类似的问题，也花了我数千个小时。然而，解决方案非常简单，以下是ANativeWindow_fromSurface评论中的一句话：


/*... This acquires a reference on the ANativeWindow that is returned; be sure to use ANativeWindow_release() ...*/

因此，窗口对象将在ANativeWindow_fromSurface时锁定。不只是ANativeWindow_acquire！因此，答案是：如果您在锁定窗口之前已经调用过ANativeWindow_acquire一次，则必须调用ANativeWindow_release两次才能释放它。

相关文章：