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gstreamer/sys/v4l2/gstv4l2element.c
Ronald S. Bultje c62995f2fc Unification of the way to speak to v4l2 and v4l elements... Also fix a segfautl when doing gst-inspect v4l2src 
Original commit message from CVS:
Unification of the way to speak to v4l2 and v4l elements... Also fix a segfautl when doing gst-inspect v4l2src
2003-03-02 21:58:52 +00:00

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/* G-Streamer generic V4L2 element
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "v4l2_calls.h"
#include "gstv4l2element-marshal.h"
/* elementfactory details */
static GstElementDetails gst_v4l2element_details = {
"Generic video4linux2 Element",
"None/Video",
"LGPL",
"Generic plugin for handling common video4linux2 calls",
VERSION,
"Ronald Bultje <rbultje@ronald.bitfreak.net>",
"(C) 2002",
};
/* V4l2Element signals and args */
enum {
/* FILL ME */
SIGNAL_OPEN,
SIGNAL_CLOSE,
SIGNAL_SET_VIDEOWINDOW,
SIGNAL_GET_ATTRIBUTE,
SIGNAL_SET_ATTRIBUTE,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_CHANNEL,
ARG_CHANNEL_NAMES,
ARG_OUTPUT,
ARG_OUTPUT_NAMES,
ARG_NORM,
ARG_NORM_NAMES,
ARG_HAS_TUNER,
ARG_FREQUENCY,
ARG_SIGNAL_STRENGTH,
ARG_HAS_AUDIO,
ARG_ATTRIBUTES,
ARG_DEVICE,
ARG_DEVICE_NAME,
ARG_DEVICE_HAS_CAPTURE,
ARG_DEVICE_HAS_OVERLAY,
ARG_DEVICE_HAS_PLAYBACK,
ARG_DISPLAY,
ARG_DO_OVERLAY,
};
static void gst_v4l2element_class_init (GstV4l2ElementClass *klass);
static void gst_v4l2element_init (GstV4l2Element *v4lelement);
static void gst_v4l2element_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_v4l2element_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static GstElementStateReturn gst_v4l2element_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
static guint gst_v4l2element_signals[LAST_SIGNAL] = { 0 };
GType
gst_v4l2element_get_type (void)
{
static GType v4l2element_type = 0;
if (!v4l2element_type) {
static const GTypeInfo v4l2element_info = {
sizeof(GstV4l2ElementClass),
NULL,
NULL,
(GClassInitFunc) gst_v4l2element_class_init,
NULL,
NULL,
sizeof(GstV4l2Element),
0,
(GInstanceInitFunc) gst_v4l2element_init,
NULL
};
v4l2element_type = g_type_register_static(GST_TYPE_ELEMENT,
"GstV4l2Element", &v4l2element_info, 0);
}
return v4l2element_type;
}
static void
gst_v4l2element_class_init (GstV4l2ElementClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CHANNEL,
g_param_spec_int("channel","channel","channel",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CHANNEL_NAMES,
g_param_spec_pointer("channel_names","channel_names","channel_names",
G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_OUTPUT,
g_param_spec_int("output","output","output",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_OUTPUT_NAMES,
g_param_spec_pointer("output_names","output_names","output_names",
G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NORM,
g_param_spec_int("norm","norm","norm",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NORM_NAMES,
g_param_spec_pointer("norm_names","norm_names","norm_names",
G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HAS_TUNER,
g_param_spec_boolean("has_tuner","has_tuner","has_tuner",
0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FREQUENCY,
g_param_spec_ulong("frequency","frequency","frequency",
0,G_MAXULONG,0,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SIGNAL_STRENGTH,
g_param_spec_ulong("signal_strength","signal_strength","signal_strength",
0,G_MAXULONG,0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HAS_AUDIO,
g_param_spec_boolean("has_audio","has_audio","has_audio",
0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ATTRIBUTES,
g_param_spec_pointer("attributes","attributes","attributes",
G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE,
g_param_spec_string("device","device","device",
NULL, G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE_NAME,
g_param_spec_string("device_name","device_name","device_name",
NULL, G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE_HAS_CAPTURE,
g_param_spec_boolean("can_capture","can_capture","can_capture",
0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE_HAS_PLAYBACK,
g_param_spec_boolean("can_playback","can_playback","can_playback",
0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE_HAS_OVERLAY,
g_param_spec_boolean("has_overlay","has_overlay","has_overlay",
0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DISPLAY,
g_param_spec_string("display","display","display",
NULL, G_PARAM_WRITABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DO_OVERLAY,
g_param_spec_boolean("do_overlay","do_overlay","do_overlay",
0,G_PARAM_WRITABLE));
/* actions */
gst_v4l2element_signals[SIGNAL_SET_VIDEOWINDOW] =
g_signal_new ("set_videowindow",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(GstV4l2ElementClass, set_videowindow),
NULL, NULL,
gstv4l2_cclosure_marshal_BOOLEAN__INT_INT_INT_INT_POINTER_INT,
G_TYPE_BOOLEAN, 6,
G_TYPE_INT, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT,
G_TYPE_POINTER, G_TYPE_INT);
klass->set_videowindow = gst_v4l2_set_window;
gst_v4l2element_signals[SIGNAL_GET_ATTRIBUTE] =
g_signal_new ("get_attribute",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(GstV4l2ElementClass, get_attribute),
NULL, NULL,
gstv4l2_cclosure_marshal_BOOLEAN__STRING_POINTER,
G_TYPE_BOOLEAN, 2, G_TYPE_STRING, G_TYPE_POINTER);
klass->get_attribute = gst_v4l2_get_attribute;
gst_v4l2element_signals[SIGNAL_SET_ATTRIBUTE] =
g_signal_new ("set_attribute",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET(GstV4l2ElementClass, set_attribute),
NULL, NULL,
gstv4l2_cclosure_marshal_BOOLEAN__STRING_INT,
G_TYPE_BOOLEAN, 2, G_TYPE_STRING, G_TYPE_INT);
klass->set_attribute = gst_v4l2_set_attribute;
/* signals */
gst_v4l2element_signals[SIGNAL_OPEN] =
g_signal_new("open", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2ElementClass, open),
NULL, NULL, g_cclosure_marshal_VOID__STRING,
G_TYPE_NONE, 1, G_TYPE_STRING);
gst_v4l2element_signals[SIGNAL_CLOSE] =
g_signal_new("close", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2ElementClass, close),
NULL, NULL, g_cclosure_marshal_VOID__STRING,
G_TYPE_NONE, 1, G_TYPE_STRING);
gobject_class->set_property = gst_v4l2element_set_property;
gobject_class->get_property = gst_v4l2element_get_property;
gstelement_class->change_state = gst_v4l2element_change_state;
}
static void
gst_v4l2element_init (GstV4l2Element *v4l2element)
{
/* some default values */
v4l2element->video_fd = -1;
v4l2element->buffer = NULL;
v4l2element->device = NULL;
v4l2element->norm = -1;
v4l2element->channel = -1;
v4l2element->output = -1;
v4l2element->frequency = 0;
v4l2element->controls = NULL;
v4l2element->menus = NULL;
v4l2element->control_specs = NULL;
v4l2element->outputs = NULL;
v4l2element->output_names = NULL;
v4l2element->inputs = NULL;
v4l2element->input_names = NULL;
v4l2element->norms = NULL;
v4l2element->norm_names = NULL;
}
static void
gst_v4l2element_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstV4l2Element *v4l2element;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_V4L2ELEMENT(object));
v4l2element = GST_V4L2ELEMENT(object);
switch (prop_id) {
case ARG_CHANNEL:
v4l2element->channel = g_value_get_int(value);
if (GST_V4L2_IS_OPEN(v4l2element) && !GST_V4L2_IS_ACTIVE(v4l2element)) {
if (!gst_v4l2_set_input(v4l2element, g_value_get_int(value)))
return;
}
break;
case ARG_OUTPUT:
v4l2element->output = g_value_get_int(value);
if (GST_V4L2_IS_OPEN(v4l2element) && !GST_V4L2_IS_ACTIVE(v4l2element)) {
if (!gst_v4l2_set_output(v4l2element, g_value_get_int(value)))
return;
}
break;
case ARG_NORM:
v4l2element->norm = g_value_get_int(value);
if (GST_V4L2_IS_OPEN(v4l2element) && !GST_V4L2_IS_ACTIVE(v4l2element)) {
if (!gst_v4l2_set_norm(v4l2element, g_value_get_int(value)))
return;
}
break;
case ARG_FREQUENCY:
v4l2element->frequency = g_value_get_ulong(value);
if (GST_V4L2_IS_OPEN(v4l2element) && !GST_V4L2_IS_ACTIVE(v4l2element)) {
if (!gst_v4l2_set_frequency(v4l2element, g_value_get_ulong(value)))
return;
}
break;
case ARG_DEVICE:
if (!GST_V4L2_IS_OPEN(v4l2element)) {
if (v4l2element->device)
g_free(v4l2element->device);
v4l2element->device = g_strdup(g_value_get_string(value));
}
break;
case ARG_DISPLAY:
if (!gst_v4l2_set_display(v4l2element, g_value_get_string(value)))
return;
break;
case ARG_DO_OVERLAY:
if (GST_V4L2_IS_OPEN(v4l2element)) {
if (!gst_v4l2_enable_overlay(v4l2element, g_value_get_boolean(value)))
return;
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_v4l2element_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstV4l2Element *v4l2element;
gint temp_i = 0;
gulong temp_ul = 0;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_V4L2ELEMENT(object));
v4l2element = GST_V4L2ELEMENT(object);
switch (prop_id) {
case ARG_CHANNEL:
if (GST_V4L2_IS_OPEN(v4l2element))
gst_v4l2_get_input(v4l2element, &temp_i);
g_value_set_int(value, temp_i);
break;
case ARG_CHANNEL_NAMES:
g_value_set_pointer(value, v4l2element->input_names);
break;
case ARG_OUTPUT:
if (GST_V4L2_IS_OPEN(v4l2element))
gst_v4l2_get_output(v4l2element, &temp_i);
g_value_set_int(value, temp_i);
break;
case ARG_OUTPUT_NAMES:
g_value_set_pointer(value, v4l2element->output_names);
break;
case ARG_NORM:
if (GST_V4L2_IS_OPEN(v4l2element))
gst_v4l2_get_norm(v4l2element, &temp_i);
g_value_set_int(value, temp_i);
break;
case ARG_NORM_NAMES:
g_value_set_pointer(value, v4l2element->norm_names);
break;
case ARG_HAS_TUNER:
if (GST_V4L2_IS_OPEN(v4l2element))
g_value_set_boolean(value,
gst_v4l2_has_tuner(v4l2element, &temp_i));
break;
case ARG_FREQUENCY:
if (GST_V4L2_IS_OPEN(v4l2element))
gst_v4l2_get_frequency(v4l2element, &temp_ul);
g_value_set_ulong(value, temp_ul);
break;
case ARG_SIGNAL_STRENGTH:
if (GST_V4L2_IS_OPEN(v4l2element))
gst_v4l2_signal_strength(v4l2element, &temp_ul);
g_value_set_ulong(value, temp_ul);
break;
case ARG_HAS_AUDIO:
if (GST_V4L2_IS_OPEN(v4l2element))
temp_i = gst_v4l2_has_audio(v4l2element);
g_value_set_boolean(value, temp_i>0?TRUE:FALSE);
break;
case ARG_ATTRIBUTES:
g_value_set_pointer(value, v4l2element->control_specs);
break;
case ARG_DEVICE:
g_value_set_string(value, v4l2element->device);
break;
case ARG_DEVICE_NAME:
if (GST_V4L2_IS_OPEN(v4l2element))
g_value_set_string(value, v4l2element->vcap.card);
break;
case ARG_DEVICE_HAS_CAPTURE:
if (GST_V4L2_IS_OPEN(v4l2element) &&
v4l2element->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE &&
v4l2element->vcap.capabilities & V4L2_CAP_STREAMING)
temp_i = 1;
g_value_set_boolean(value, temp_i>0?TRUE:FALSE);
break;
case ARG_DEVICE_HAS_OVERLAY:
if (GST_V4L2_IS_OPEN(v4l2element) &&
v4l2element->vcap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
temp_i = 1;
g_value_set_boolean(value, temp_i>0?TRUE:FALSE);
break;
case ARG_DEVICE_HAS_PLAYBACK:
if (GST_V4L2_IS_OPEN(v4l2element) &&
v4l2element->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT &&
v4l2element->vcap.capabilities & V4L2_CAP_STREAMING)
temp_i = 1;
g_value_set_boolean(value, temp_i>0?TRUE:FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_v4l2element_change_state (GstElement *element)
{
GstV4l2Element *v4l2element;
g_return_val_if_fail(GST_IS_V4L2ELEMENT(element), GST_STATE_FAILURE);
v4l2element = GST_V4L2ELEMENT(element);
/* if going down into NULL state, close the device if it's open
* if going to READY, open the device (and set some options)
*/
switch (GST_STATE_TRANSITION(element)) {
case GST_STATE_NULL_TO_READY:
if (!gst_v4l2_open(v4l2element))
return GST_STATE_FAILURE;
/* emit a signal! whoopie! */
g_signal_emit(G_OBJECT(v4l2element),
gst_v4l2element_signals[SIGNAL_OPEN], 0,
v4l2element->device);
/* now, sync options */
if (v4l2element->norm >= 0)
if (!gst_v4l2_set_norm(v4l2element, v4l2element->norm))
return GST_STATE_FAILURE;
if (v4l2element->channel >= 0)
if (!gst_v4l2_set_input(v4l2element, v4l2element->channel))
return GST_STATE_FAILURE;
if (v4l2element->output >= 0)
if (!gst_v4l2_set_output(v4l2element, v4l2element->output))
return GST_STATE_FAILURE;
if (v4l2element->frequency > 0)
if (!gst_v4l2_set_frequency(v4l2element, v4l2element->frequency))
return GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_NULL:
if (!gst_v4l2_close(v4l2element))
return GST_STATE_FAILURE;
/* emit yet another signal! wheehee! */
g_signal_emit(G_OBJECT(v4l2element),
gst_v4l2element_signals[SIGNAL_CLOSE], 0,
v4l2element->device);
break;
}
if (GST_ELEMENT_CLASS(parent_class)->change_state)
return GST_ELEMENT_CLASS(parent_class)->change_state(element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GModule *module,
GstPlugin *plugin)
{
GstElementFactory *factory;
/* create an elementfactory for the v4l2element */
factory = gst_element_factory_new("v4l2element", GST_TYPE_V4L2ELEMENT,
&gst_v4l2element_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"v4l2element",
plugin_init
};
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