gstreamer/subprojects/gst-plugins-base/tools/gst-device-monitor.c

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/* GStreamer command line device monitor testing utility
* Copyright (C) 2014 Tim-Philipp Müller <tim@centricular.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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <locale.h>
#include <gst/gst.h>
#include <gst/gst-i18n-app.h>
#include <gst/math-compat.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
GST_DEBUG_CATEGORY (devmon_debug);
#define GST_CAT_DEFAULT devmon_debug
typedef struct
{
GMainLoop *loop;
GstDeviceMonitor *monitor;
guint bus_watch_id;
} DevMonApp;
static gboolean bus_msg_handler (GstBus * bus, GstMessage * msg, gpointer data);
static gchar *
get_launch_line (GstDevice * device)
{
static const char *const ignored_propnames[] =
{ "name", "parent", "direction", "template", "caps", NULL };
GString *launch_line;
GstElement *element;
GstElement *pureelement;
GParamSpec **properties, *property;
GValue value = G_VALUE_INIT;
GValue pvalue = G_VALUE_INIT;
guint i, number_of_properties;
GstElementFactory *factory;
element = gst_device_create_element (device, NULL);
if (!element)
return NULL;
factory = gst_element_get_factory (element);
if (!factory) {
gst_object_unref (element);
return NULL;
}
if (!gst_plugin_feature_get_name (factory)) {
gst_object_unref (element);
return NULL;
}
launch_line = g_string_new (gst_plugin_feature_get_name (factory));
pureelement = gst_element_factory_create (factory, NULL);
/* get paramspecs and show non-default properties */
properties =
g_object_class_list_properties (G_OBJECT_GET_CLASS (element),
&number_of_properties);
if (properties) {
for (i = 0; i < number_of_properties; i++) {
gint j;
gboolean ignore = FALSE;
property = properties[i];
/* skip some properties */
if ((property->flags & G_PARAM_READWRITE) != G_PARAM_READWRITE)
continue;
for (j = 0; ignored_propnames[j]; j++)
if (!g_strcmp0 (ignored_propnames[j], property->name))
ignore = TRUE;
if (ignore)
continue;
/* Can't use _param_value_defaults () because sub-classes modify the
* values already.
*/
g_value_init (&value, property->value_type);
g_value_init (&pvalue, property->value_type);
g_object_get_property (G_OBJECT (element), property->name, &value);
g_object_get_property (G_OBJECT (pureelement), property->name, &pvalue);
if (gst_value_compare (&value, &pvalue) != GST_VALUE_EQUAL) {
gchar *valuestr = gst_value_serialize (&value);
if (!valuestr) {
GST_WARNING ("Could not serialize property %s:%s",
GST_OBJECT_NAME (element), property->name);
g_free (valuestr);
goto next;
}
g_string_append_printf (launch_line, " %s=%s",
property->name, valuestr);
g_free (valuestr);
}
next:
g_value_unset (&value);
g_value_unset (&pvalue);
}
g_free (properties);
}
gst_object_unref (element);
gst_object_unref (pureelement);
return g_string_free (launch_line, FALSE);
}
static gboolean
print_structure_field (GQuark field_id, const GValue * value,
gpointer user_data)
{
gchar *val;
if (G_VALUE_HOLDS_UINT (value)) {
val = g_strdup_printf ("%u (0x%08x)", g_value_get_uint (value),
g_value_get_uint (value));
} else {
val = gst_value_serialize (value);
}
if (val != NULL)
g_print ("\n\t\t%s = %s", g_quark_to_string (field_id), val);
else
g_print ("\n\t\t%s - could not serialise field of type %s",
g_quark_to_string (field_id), G_VALUE_TYPE_NAME (value));
g_free (val);
return TRUE;
}
static gboolean
print_field (GQuark field, const GValue * value, gpointer unused)
{
gchar *str = gst_value_serialize (value);
g_print (", %s=%s", g_quark_to_string (field), str);
g_free (str);
return TRUE;
}
static void
print_device (GstDevice * device, gboolean modified)
{
gchar *device_class, *str, *name;
GstCaps *caps;
GstStructure *props;
guint i, size = 0;
caps = gst_device_get_caps (device);
if (caps != NULL)
size = gst_caps_get_size (caps);
name = gst_device_get_display_name (device);
device_class = gst_device_get_device_class (device);
props = gst_device_get_properties (device);
g_print ("\nDevice %s:\n\n", modified ? "modified" : "found");
g_print ("\tname : %s\n", name);
g_print ("\tclass : %s\n", device_class);
for (i = 0; i < size; ++i) {
GstStructure *s = gst_caps_get_structure (caps, i);
GstCapsFeatures *features = gst_caps_get_features (caps, i);
g_print ("\t%s %s", (i == 0) ? "caps :" : " ",
gst_structure_get_name (s));
if (features && (gst_caps_features_is_any (features) ||
!gst_caps_features_is_equal (features,
GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY))) {
gchar *features_string = gst_caps_features_to_string (features);
g_print ("(%s)", features_string);
g_free (features_string);
}
gst_structure_foreach (s, print_field, NULL);
g_print ("\n");
}
if (props) {
g_print ("\tproperties:");
gst_structure_foreach (props, print_structure_field, NULL);
gst_structure_free (props);
g_print ("\n");
}
str = get_launch_line (device);
if (gst_device_has_classes (device, "Source"))
g_print ("\tgst-launch-1.0 %s ! ...\n", str);
else if (gst_device_has_classes (device, "Sink"))
g_print ("\tgst-launch-1.0 ... ! %s\n", str);
else if (gst_device_has_classes (device, "CameraSource")) {
g_print ("\tgst-launch-1.0 %s.vfsrc name=camerasrc ! ... "
"camerasrc.vidsrc ! [video/x-h264] ... \n", str);
}
g_free (str);
g_print ("\n");
g_free (name);
g_free (device_class);
if (caps != NULL)
gst_caps_unref (caps);
}
static void
device_removed (GstDevice * device)
{
gchar *name;
name = gst_device_get_display_name (device);
g_print ("Device removed:\n");
g_print ("\tname : %s\n", name);
g_free (name);
}
static gboolean
bus_msg_handler (GstBus * bus, GstMessage * msg, gpointer user_data)
{
GstDevice *device;
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_DEVICE_ADDED:
gst_message_parse_device_added (msg, &device);
print_device (device, FALSE);
gst_object_unref (device);
break;
case GST_MESSAGE_DEVICE_REMOVED:
gst_message_parse_device_removed (msg, &device);
device_removed (device);
gst_object_unref (device);
break;
case GST_MESSAGE_DEVICE_CHANGED:
gst_message_parse_device_changed (msg, &device, NULL);
print_device (device, TRUE);
gst_object_unref (device);
break;
default:
g_print ("%s message\n", GST_MESSAGE_TYPE_NAME (msg));
break;
}
return TRUE;
}
static gboolean
quit_loop (GMainLoop * loop)
{
g_main_loop_quit (loop);
return G_SOURCE_REMOVE;
}
int
main (int argc, char **argv)
{
gboolean print_version = FALSE;
GError *err = NULL;
gchar **arg, **args = NULL;
gboolean follow = FALSE;
gboolean include_hidden = FALSE;
GOptionContext *ctx;
GOptionEntry options[] = {
{"version", 0, 0, G_OPTION_ARG_NONE, &print_version,
N_("Print version information and exit"), NULL},
{"follow", 'f', 0, G_OPTION_ARG_NONE, &follow,
N_("Don't exit after showing the initial device list, but wait "
"for devices to added/removed."), NULL},
{"include-hidden", 'i', 0, G_OPTION_ARG_NONE, &include_hidden,
N_("Include devices from hidden device providers."), NULL},
{G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &args, NULL},
{NULL}
};
GTimer *timer;
DevMonApp app;
GstBus *bus;
setlocale (LC_ALL, "");
#ifdef ENABLE_NLS
bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
textdomain (GETTEXT_PACKAGE);
#endif
g_set_prgname ("gst-device-monitor-" GST_API_VERSION);
ctx = g_option_context_new ("[DEVICE_CLASSES[:FILTER_CAPS]] "
"[DEVICE_CLASSES[:FILTER_CAPS]] …");
g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
g_option_context_add_group (ctx, gst_init_get_option_group ());
if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
g_print ("Error initializing: %s\n", GST_STR_NULL (err->message));
g_option_context_free (ctx);
g_clear_error (&err);
return 1;
}
g_option_context_free (ctx);
GST_DEBUG_CATEGORY_INIT (devmon_debug, "device-monitor", 0,
"gst-device-monitor");
if (print_version) {
gchar *version_str;
version_str = gst_version_string ();
g_print ("%s version %s\n", g_get_prgname (), PACKAGE_VERSION);
g_print ("%s\n", version_str);
g_print ("%s\n", GST_PACKAGE_ORIGIN);
g_free (version_str);
return 0;
}
app.loop = g_main_loop_new (NULL, FALSE);
app.monitor = gst_device_monitor_new ();
gst_device_monitor_set_show_all_devices (app.monitor, include_hidden);
bus = gst_device_monitor_get_bus (app.monitor);
app.bus_watch_id = gst_bus_add_watch (bus, bus_msg_handler, &app);
gst_object_unref (bus);
/* process optional remaining arguments in the form
* DEVICE_CLASSES or DEVICE_CLASSES:FILTER_CAPS */
for (arg = args; arg != NULL && *arg != NULL; ++arg) {
gchar **filters = g_strsplit (*arg, ":", -1);
if (filters != NULL && filters[0] != NULL) {
GstCaps *caps = NULL;
if (filters[1] != NULL) {
caps = gst_caps_from_string (filters[1]);
if (caps == NULL)
g_warning ("Couldn't parse device filter caps '%s'", filters[1]);
}
gst_device_monitor_add_filter (app.monitor, filters[0], caps);
if (caps)
gst_caps_unref (caps);
g_strfreev (filters);
}
}
g_strfreev (args);
g_print ("Probing devices...\n\n");
timer = g_timer_new ();
if (!gst_device_monitor_start (app.monitor)) {
g_printerr ("Failed to start device monitor!\n");
return -1;
}
GST_INFO ("Took %.2f seconds", g_timer_elapsed (timer, NULL));
if (!follow) {
/* Consume all the messages pending on the bus and exit */
g_idle_add ((GSourceFunc) quit_loop, app.loop);
} else {
g_print ("Monitoring devices, waiting for devices to be removed or "
"new devices to be added...\n");
}
g_main_loop_run (app.loop);
gst_device_monitor_stop (app.monitor);
gst_object_unref (app.monitor);
g_source_remove (app.bus_watch_id);
g_main_loop_unref (app.loop);
g_timer_destroy (timer);
return 0;
}