1.下游更改后强行恢复至上游最新状态
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git remote add upstream https://github.com/poemdistance/ScreenTranslation git fetch upstream git pull upstream master |
2.Submodules， 第一次更新下载...
Continue reading...August 2019
Python计算中文字符串长度时的注意事项
Python直接调用len计算出的是字符个数。如下：
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>>> s = '测试' >>> len(s) 2 |
如果要得到字节长度可以编码成utf-8格式：
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>>> s = '测试' >>> len(s.encode('utf8')) 6 |
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Continue reading...C语言exec 簇函数注意事项
exec函数簇在运行的时候是将原进程的映像替换成新的执行进程的，所以如果直接在一个进程中，即main函数中调用execl, execp等函数，主进程会被替换掉，exec簇函数后面的内容将不会被执行，所以如果要使用此函数，可以fork一个子进程来运行。 同样地，在线程中调用了此类函数，主进程的所有映像也一样会替换掉，因为线程没有独立地址空间，进程有，而exec簇函数会改变进程的映像，只能拿线程所在的进程下手。 exec类函数相关信息参照：execl(3)...
Continue reading...Python 以官方方式连接操作数据库
一： 下载数据库连接器
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pip install mysql-connector-python |
参考：https://dev.mysql.com/doc/connector-python/en/connector-python-installation-binary.html...
Continue reading...WordPress 修改文章标题字体大小
思路： 用浏览器的F12调试功能，找到定义文章标题字体属性的class，如在写这篇文章时，本网站主题定义标题字体的class为entry-title 登录到服务器，cd到主题文件目录下，运行命令grep entry-title...
Continue reading...GStreamer学习笔记 – GStreamer实现ogg 格式音频播放及代码解析
源代码出处: https://gstreamer.freedesktop.org/documentation/application-development/basics/helloworld.html?gi-language=c
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#include <gst/gst.h> #include <glib.h> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) { GMainLoop *loop = (GMainLoop *) data; switch (GST_MESSAGE_TYPE (msg)) { case GST_MESSAGE_EOS: g_print ("End of stream\n"); g_main_loop_quit (loop); break; case GST_MESSAGE_ERROR: { gchar *debug; GError *error; gst_message_parse_error (msg, &error, &debug); g_free (debug); g_printerr ("Error: %s\n", error->message); g_error_free (error); g_main_loop_quit (loop); break; } default: break; } return TRUE; } static void on_pad_added (GstElement *element, GstPad *pad, gpointer data) { GstPad *sinkpad; GstElement *decoder = (GstElement *) data; /* We can now link this pad with the vorbis-decoder sink pad */ g_print ("Dynamic pad created, linking demuxer/decoder\n"); sinkpad = gst_element_get_static_pad (decoder, "sink"); gst_pad_link (pad, sinkpad); gst_object_unref (sinkpad); } int main (int argc, char *argv[]) { GMainLoop *loop; GstElement *pipeline, *source, *demuxer, *decoder, *conv, *sink; GstBus *bus; guint bus_watch_id; /* Initialisation */ gst_init (&argc, &argv); loop = g_main_loop_new (NULL, FALSE); /* Check input arguments */ if (argc != 2) { g_printerr ("Usage: %s <Ogg/Vorbis filename>\n", argv[0]); return -1; } /* Create gstreamer elements */ pipeline = gst_pipeline_new ("audio-player"); source = gst_element_factory_make ("filesrc", "file-source"); //用于连接文件 demuxer = gst_element_factory_make ("oggdemux", "ogg-demuxer"); //分离器 decoder = gst_element_factory_make ("vorbisdec", "vorbis-decoder"); //解码器 conv = gst_element_factory_make ("audioconvert", "converter"); //转换器 sink = gst_element_factory_make ("autoaudiosink", "audio-output"); //接收器 if (!pipeline || !source || !demuxer || !decoder || !conv || !sink) { g_printerr ("One element could not be created. Exiting.\n"); return -1; } /* Set up the pipeline */ /* we set the input filename to the source element */ g_object_set (G_OBJECT (source), "location", argv[1], NULL); /* we add a message handler */ bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline)); bus_watch_id = gst_bus_add_watch (bus, bus_call, loop); gst_object_unref (bus); /* we add all elements into the pipeline */ /* file-source | ogg-demuxer | vorbis-decoder | converter | alsa-output */ gst_bin_add_many (GST_BIN (pipeline), source, demuxer, decoder, conv, sink, NULL); /* we link the elements together */ /* file-source -> ogg-demuxer ~> vorbis-decoder -> converter -> alsa-output */ gst_element_link (source, demuxer); gst_element_link_many (decoder, conv, sink, NULL); g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added), decoder); /* note that the demuxer will be linked to the decoder dynamically. The reason is that Ogg may contain various streams (for example audio and video). The source pad(s) will be created at run time, by the demuxer when it detects the amount and nature of streams. Therefore we connect a callback function which will be executed when the "pad-added" is emitted.*/ /* Set the pipeline to "playing" state*/ g_print ("Now playing: %s\n", argv[1]); gst_element_set_state (pipeline, GST_STATE_PLAYING); /* Iterate */ g_print ("Running...\n"); g_main_loop_run (loop); /* Out of the main loop, clean up nicely */ g_print ("Returned, stopping playback\n"); gst_element_set_state (pipeline, GST_STATE_NULL); g_print ("Deleting pipeline\n"); gst_object_unref (GST_OBJECT (pipeline)); g_source_remove (bus_watch_id); g_main_loop_unref (loop); return 0; } |
编译 gcc -Wall helloworld.c -o helloworld $(pkg-config --cflags --libs gstreamer-1.0)，运行...
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