From 94ed18008a8847c35707fbd366ceec8c0fb8f6e5 Mon Sep 17 00:00:00 2001 From: Wim Taymans Date: Fri, 23 Aug 2013 15:14:29 +0200 Subject: [PATCH] tests: add appsrc example Add an example on how to use appsrc to feed the server pipeline with data. --- examples/test-appsrc.c | 137 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 examples/test-appsrc.c diff --git a/examples/test-appsrc.c b/examples/test-appsrc.c new file mode 100644 index 0000000..9d271ea --- /dev/null +++ b/examples/test-appsrc.c @@ -0,0 +1,137 @@ +/* GStreamer + * Copyright (C) 2008 Wim Taymans + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#include + +#include + +typedef struct +{ + gboolean white; + GstClockTime timestamp; +} MyContext; + +/* called when we need to give data to appsrc */ +static void +need_data (GstElement * appsrc, guint unused, MyContext * ctx) +{ + GstBuffer *buffer; + guint size; + GstFlowReturn ret; + + size = 385 * 288 * 2; + + buffer = gst_buffer_new_allocate (NULL, size, NULL); + + /* this makes the image black/white */ + gst_buffer_memset (buffer, 0, ctx->white ? 0xff : 0x0, size); + + ctx->white = !ctx->white; + + /* increment the timestamp every 1/2 second */ + GST_BUFFER_PTS (buffer) = ctx->timestamp; + GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale_int (1, GST_SECOND, 2); + ctx->timestamp += GST_BUFFER_DURATION (buffer); + + g_signal_emit_by_name (appsrc, "push-buffer", buffer, &ret); +} + +/* called when a new media pipeline is constructed. We can query the + * pipeline and configure our appsrc */ +static void +media_configure (GstRTSPMediaFactory * factory, GstRTSPMedia * media, + gpointer user_data) +{ + GstElement *element, *appsrc; + MyContext *ctx; + + /* get the element used for providing the streams of the media */ + element = gst_rtsp_media_get_element (media); + + /* get our appsrc, we named it 'mysrc' with the name property */ + appsrc = gst_bin_get_by_name_recurse_up (GST_BIN (element), "mysrc"); + + /* this instructs appsrc that we will be dealing with timed buffer */ + gst_util_set_object_arg (G_OBJECT (appsrc), "format", "time"); + /* configure the caps of the video */ + g_object_set (G_OBJECT (appsrc), "caps", + gst_caps_new_simple ("video/x-raw", + "format", G_TYPE_STRING, "RGB16", + "width", G_TYPE_INT, 384, + "height", G_TYPE_INT, 288, + "framerate", GST_TYPE_FRACTION, 0, 1, NULL), NULL); + + ctx = g_new0 (MyContext, 1); + ctx->white = FALSE; + ctx->timestamp = 0; + /* make sure ther datais freed when the media is gone */ + g_object_set_data_full (G_OBJECT (media), "my-extra-data", ctx, + (GDestroyNotify) g_free); + + /* install the callback that will be called when a buffer is needed */ + g_signal_connect (appsrc, "need-data", (GCallback) need_data, ctx); +} + +int +main (int argc, char *argv[]) +{ + GMainLoop *loop; + GstRTSPServer *server; + GstRTSPMountPoints *mounts; + GstRTSPMediaFactory *factory; + + gst_init (&argc, &argv); + + loop = g_main_loop_new (NULL, FALSE); + + /* create a server instance */ + server = gst_rtsp_server_new (); + + /* get the mount points for this server, every server has a default object + * that be used to map uri mount points to media factories */ + mounts = gst_rtsp_server_get_mount_points (server); + + /* make a media factory for a test stream. The default media factory can use + * gst-launch syntax to create pipelines. + * any launch line works as long as it contains elements named pay%d. Each + * element with pay%d names will be a stream */ + factory = gst_rtsp_media_factory_new (); + gst_rtsp_media_factory_set_launch (factory, + "( appsrc name=mysrc ! videoconvert ! x264enc ! rtph264pay name=pay0 pt=96 )"); + + /* notify when our media is ready, This is called whenever someone asks for + * the media and a new pipeline with our appsrc is created */ + g_signal_connect (factory, "media-configure", (GCallback) media_configure, + NULL); + + /* attach the test factory to the /test url */ + gst_rtsp_mount_points_add_factory (mounts, "/test", factory); + + /* don't need the ref to the mounts anymore */ + g_object_unref (mounts); + + /* attach the server to the default maincontext */ + gst_rtsp_server_attach (server, NULL); + + /* start serving */ + g_print ("stream ready at rtsp://127.0.0.1:8554/test\n"); + g_main_loop_run (loop); + + return 0; +} -- 2.7.4