udpsink0无法在Android 10模拟器上创建套接字

Question

我是安卓应用程序和GStreamer的新手，所以请容忍我。感谢您对解决此问题的任何指导。

在花费了大量的时间之后，我能够在1上成功地运行/移植所有GStreamer教程上的Pixel_3a_API_29仿真器和GStreamer预建库。

现在，我正在尝试修改Android-turess-2和下面的管道，以便通过网络流发送音频数据，但是udpsink造成了问题。我已经证实了这一点，用udpsink替换了fakesink，并且管道运行良好。

const gchar *pipeline = "audiotestsrc ! audioconvert ! rtpL16pay ! udpsink";

错误仿真器映像

我做了一些故障排除，以找出问题所在，并能够找到错误gst_multiudpsink_start:<udpsink0> error: Could not create socket: Unable to create socket: Operation not permitted。

我找到了这线程，但它与我的环境完全无关。

2022-06-24 13:57:28.714 13587-13587/org.freedesktop.gstreamer.tutorials.tutorial_2 I/GStreamer: GStreamer initialization complete
2022-06-24 13:57:28.767 13587-13587/org.freedesktop.gstreamer.tutorials.tutorial_2 I/GStreamer: Activity created. There is no saved state, playing: false
2022-06-24 13:57:28.768 13587-13587/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.176483700 0x77698cb49d30 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:236:gst_native_init Created CustomData at 0x77698a063550
2022-06-24 13:57:28.768 13587-13587/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.176564000 0x77698cb49d30 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:238:gst_native_init Created GlobalRef for app object at 0x2cba
2022-06-24 13:57:28.768 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.177255400 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:163:app_function Creating pipeline in CustomData at 0x77698a063550
2022-06-24 13:57:28.770 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.179423700 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:206:app_function Entering main loop... (CustomData:0x77698a063550)
2022-06-24 13:57:28.771 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.179482100 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:51:attach_current_thread Attaching thread 0x776989f9e210
2022-06-24 13:57:28.771 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.179939100 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:143:check_initialization_complete Initialization complete, notifying application. main_loop:0x77698a07f8e0
2022-06-24 13:57:28.771 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 I/GStreamer: Gst initialized. Restoring state, playing:false
2022-06-24 13:57:28.771 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.180105000 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:279:gst_native_pause Setting state to PAUSED
2022-06-24 13:57:28.771 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 W/GStreamer+multiudpsink: 0:00:00.180351400 0x776989f9e210 ../gst/udp/gstmultiudpsink.c:1445:gst_multiudpsink_start:<udpsink0> error: Could not create socket: Unable to create socket: Operation not permitted
2022-06-24 13:57:28.771 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 W/GStreamer+basesink: 0:00:00.180394100 0x776989f9e210 ../libs/gst/base/gstbasesink.c:5879:gst_base_sink_change_state:<udpsink0> error: Failed to start
2022-06-24 13:57:28.772 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.180738700 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:91:set_ui_message Setting message to: Error received from element udpsink0: GStreamer encountered a general resource error.
2022-06-24 13:57:28.772 13587-13663/org.freedesktop.gstreamer.tutorials.tutorial_2 D/GStreamer+tutorial-2: 0:00:00.181023400 0x776989f9e210 C:/Sandbox/gst-docs-master/examples/tutorials/android/android-tutorial-2/jni/tutorial-2.c:91:set_ui_message Setting message to: Error received from element udpsink0: GStreamer error: state change failed and some element failed to post a proper error message with the reason for the failure.
2022-06-24 13:57:28.822 13587-13660/org.freedesktop.gstreamer.tutorials.tutorial_2 D/HostConnection: HostConnection::get() New Host Connection established 0x7769d889f7c0, tid 13660

Answer 1

这不是代码的问题，而是权限的问题。显然，我不知道安卓应用程序是如何工作的，在AndroidManifest.xml中添加了以下内容解决了我的问题。

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

稍后，我还发现，如果您正在处理来自媒体的读写操作，其他的权限标记可能会很有用，

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

希望这能帮助像我这样的初学者。