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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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173 lines
4.7 KiB
C
173 lines
4.7 KiB
C
/* GStreamer
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*
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* Copyright (C) 2015 Samsung Electronics. All rights reserved.
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* Author: Thiago Santos <thiagoss@osg.samsung.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* demo for showing v4l2src renegotiating */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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/* Options */
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static const gchar *device = "/dev/video0";
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static const gchar *videosink = "autovideosink";
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static const gchar *io_mode = "mmap";
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static const gchar *def_resolutions[] = {
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"320x240",
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"1280x720",
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"640x480",
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NULL
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};
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static const gchar **resolutions = def_resolutions;
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static GOptionEntry entries[] = {
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{"device", 'd', 0, G_OPTION_ARG_STRING, &device, "V4L2 Camera Device",
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NULL},
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{"videosink", 's', 0, G_OPTION_ARG_STRING, &videosink, "Video Sink to use",
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NULL},
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{"io-mode", 'z', 0, G_OPTION_ARG_STRING, &io_mode,
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"Configure the \"io-mode\" property on v4l2scr", NULL},
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{"resolution", 'r', 0, G_OPTION_ARG_STRING_ARRAY, &resolutions,
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"Add a resolution to the list", NULL},
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{NULL}
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};
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static GMainLoop *loop;
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static GstElement *pipeline;
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static GstElement *src, *capsfilter;
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static gint resolution_index = 0;
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static gboolean
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bus_callback (GstBus * bus, GstMessage * message, gpointer data)
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{
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switch (message->type) {
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case GST_MESSAGE_EOS:
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g_main_loop_quit (loop);
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break;
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case GST_MESSAGE_ERROR:{
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GError *gerror;
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gchar *debug;
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gst_message_parse_error (message, &gerror, &debug);
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gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
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g_error_free (gerror);
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g_free (debug);
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g_main_loop_quit (loop);
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break;
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}
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default:
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break;
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}
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return TRUE;
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}
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static gboolean
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change_caps (gpointer data)
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{
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GstCaps *caps;
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GStrv res;
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gchar *caps_str;
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if (!resolutions[resolution_index]) {
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gst_element_send_event (pipeline, gst_event_new_eos ());
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return FALSE;
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}
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g_print ("Setting resolution to '%s'\n", resolutions[resolution_index]);
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res = g_strsplit (resolutions[resolution_index++], "x", 2);
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if (!res[0] || !res[1]) {
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g_warning ("Can't parse resolution: %s", resolutions[resolution_index - 1]);
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g_strfreev (res);
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return TRUE;
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}
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caps_str = g_strdup_printf ("video/x-raw,width=%s,height=%s", res[0], res[1]);
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caps = gst_caps_from_string (caps_str);
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g_object_set (capsfilter, "caps", caps, NULL);
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g_strfreev (res);
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g_free (caps_str);
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gst_caps_unref (caps);
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return TRUE;
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}
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gint
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main (gint argc, gchar ** argv)
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{
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GstBus *bus;
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GError *error = NULL;
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GOptionContext *context;
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gchar *desc;
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gboolean ret;
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context = g_option_context_new ("- test v4l2src live renegotition");
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g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
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g_option_context_add_group (context, gst_init_get_option_group ());
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ret = g_option_context_parse (context, &argc, &argv, &error);
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g_option_context_free (context);
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if (!ret) {
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g_print ("option parsing failed: %s\n", error->message);
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g_error_free (error);
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return 1;
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}
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loop = g_main_loop_new (NULL, FALSE);
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desc = g_strdup_printf ("v4l2src name=src device=\"%s\" io-mode=\"%s\" "
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"! capsfilter name=cf ! %s", device, io_mode, videosink);
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pipeline = gst_parse_launch (desc, &error);
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g_free (desc);
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if (!pipeline) {
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g_print ("failed to create pipeline: %s", error->message);
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g_error_free (error);
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return 1;
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}
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src = gst_bin_get_by_name (GST_BIN (pipeline), "src");
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capsfilter = gst_bin_get_by_name (GST_BIN (pipeline), "cf");
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bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
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gst_bus_add_watch (bus, bus_callback, NULL);
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gst_object_unref (bus);
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change_caps (NULL);
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/* play and wait */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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g_timeout_add_seconds (3, change_caps, NULL);
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/* mainloop and wait for eos */
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g_main_loop_run (loop);
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/* stop and cleanup */
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (src);
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gst_object_unref (capsfilter);
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gst_object_unref (GST_OBJECT (pipeline));
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g_main_loop_unref (loop);
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return 0;
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}
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