Commit 4e8ad583 authored by Nicolas Dufresne's avatar Nicolas Dufresne

examples: v4l2: add example for v4l2src renegotiation

Based on work from Thiago Santos <thiagoss@osg.samsung.com>

https://bugzilla.gnome.org/show_bug.cgi?id=682770
parent ad0dd78b
noinst_PROGRAMS = camctrl
noinst_PROGRAMS = camctrl v4l2src-renegotiate
camctrl_SOURCES = camctrl.c
camctrl_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CONTROLLER_CFLAGS) $(GST_CFLAGS)
camctrl_LDADD = $(GST_BASE_LIBS) $(GST_CONTROLLER_LIBS) $(GST_LIBS)
v4l2src_renegotiate_SOURCES = v4l2src-renegotiate.c
v4l2src_renegotiate_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CFLAGS)
v4l2src_renegotiate_LDADD = $(GST_BASE_LIBS) $(GST_LIBS)
......@@ -3,3 +3,9 @@ executable('camctrl', 'camctrl.c',
c_args : gst_plugins_good_args,
include_directories : [configinc],
install: false)
executable('v4l2src-renegotiate', 'v4l2src-renegotiate.c',
dependencies: [gst_dep],
c_args : gst_plugins_good_args,
include_directories : [configinc],
install: false)
/* GStreamer
*
* Copyright (C) 2015 Samsung Electronics. All rights reserved.
* Author: Thiago Santos <thiagoss@osg.samsung.com>
*
* 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.
*/
/* demo for showing v4l2src renegotiating */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
/* Options */
static gchar *device = "/dev/video0";
static gchar *videosink = "autovideosink";
static gboolean enable_dmabuf = FALSE;
static gchar *def_resolutions[] = {
"320x240",
"1280x720",
"640x480",
NULL
};
static gchar **resolutions = def_resolutions;
static GOptionEntry entries[] = {
{"device", 'd', 0, G_OPTION_ARG_STRING, &device, "V4L2 Camera Device",
NULL},
{"videosink", 's', 0, G_OPTION_ARG_STRING, &videosink, "Video Sink to use",
NULL},
{"enable-dmabuf", 'z', 0, G_OPTION_ARG_NONE, &enable_dmabuf,
"Enable DMABuf", NULL},
{"resolution", 'r', 0, G_OPTION_ARG_STRING_ARRAY, &resolutions,
"Add a resolution to the list", NULL},
{NULL}
};
static GMainLoop *loop;
static GstElement *pipeline;
static GstElement *src, *capsfilter;
static gint index = 0;
static gboolean
bus_callback (GstBus * bus, GstMessage * message, gpointer data)
{
switch (message->type) {
case GST_MESSAGE_EOS:
g_main_loop_quit (loop);
break;
case GST_MESSAGE_ERROR:{
GError *gerror;
gchar *debug;
gst_message_parse_error (message, &gerror, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
g_error_free (gerror);
g_free (debug);
g_main_loop_quit (loop);
break;
}
default:
break;
}
return TRUE;
}
static gboolean
change_caps (gpointer data)
{
GstCaps *caps;
GStrv res;
gchar *caps_str;
if (!resolutions[index]) {
gst_element_send_event (pipeline, gst_event_new_eos ());
return FALSE;
}
g_print ("Setting resolution to '%s'\n", resolutions[index]);
res = g_strsplit (resolutions[index++], "x", 2);
if (!res[0] || !res[1]) {
g_warning ("Can't parse resolution: %s", resolutions[index - 1]);
g_strfreev (res);
return TRUE;
}
caps_str = g_strdup_printf ("video/x-raw,width=%s,height=%s", res[0], res[1]);
caps = gst_caps_from_string (caps_str);
g_object_set (capsfilter, "caps", caps, NULL);
g_strfreev (res);
g_free (caps_str);
gst_caps_unref (caps);
return TRUE;
}
gint
main (gint argc, gchar ** argv)
{
GstBus *bus;
GError *error = NULL;
GOptionContext *context;
gchar *desc;
context = g_option_context_new ("- test v4l2src live renegotition");
g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
g_option_context_add_group (context, gst_init_get_option_group ());
if (!g_option_context_parse (context, &argc, &argv, &error)) {
g_print ("option parsing failed: %s\n", error->message);
g_error_free (error);
return 1;
}
loop = g_main_loop_new (NULL, FALSE);
desc = g_strdup_printf ("v4l2src name=src device=\"%s\" io-mode=\"%s\" "
"! capsfilter name=cf ! %s", device, enable_dmabuf ? "dmabuf" : "mmap",
videosink);
pipeline = gst_parse_launch (desc, &error);
if (!pipeline) {
g_print ("failed to create pipeline: %s", error->message);
g_error_free (error);
return 1;
}
src = gst_bin_get_by_name (GST_BIN (pipeline), "src");
capsfilter = gst_bin_get_by_name (GST_BIN (pipeline), "cf");
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_watch (bus, bus_callback, NULL);
gst_object_unref (bus);
change_caps (NULL);
/* play and wait */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_timeout_add_seconds (3, change_caps, NULL);
/* mainloop and wait for eos */
g_main_loop_run (loop);
/* stop and cleanup */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (src);
gst_object_unref (capsfilter);
gst_object_unref (GST_OBJECT (pipeline));
g_main_loop_unref (loop);
return 0;
}
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