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gstreamer/sys/v4l2/gstv4l2element.c
Ronald S. Bultje aa94247770 Some interface implementations for video4linux/video4linux2 plugins: a Tuner interface, with which one can select inp... 
Original commit message from CVS:
Some interface implementations for video4linux/video4linux2 plugins:
* a Tuner interface, with which one can select inputs and stations. Audio
work is underway here, but unfinished.
* A Xoverlay interface with which one can do simple overlay. Similar to
the API of the v4l/Xv XFree86 extension. Widget implementation for
GTK-2.0 coming up in the sandbox.
* Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty
basic and maybe somewhat overdesigned. But it'll do for now.

Apart from these interfaces, there's also a loadable library 'xwindowlistener'
that listenes to X for the movement of a window and the overlap of other
windows. This is partly copied from xawtv (and thus partly GPL :(), but it's
needed for the xoverlay interface implementation in the v4l/v4l2 elements.

Lastly, some small changes to remove redundant properties from the v4l/v4l2
elements since these can be done much simpler. Comments appreciated!
2003-10-10 12:47:42 +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 "gstv4l2tuner.h"
#include "gstv4l2xoverlay.h"
#include "gstv4l2colorbalance.h"
/* elementfactory details */
static GstElementDetails gst_v4l2element_details = {
"Generic video4linux2 Element",
"Generic/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,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_DEVICE,
ARG_DEVICE_NAME,
ARG_FLAGS
};
static void gst_v4l2element_class_init (GstV4l2ElementClass *klass);
static void gst_v4l2element_init (GstV4l2Element *v4lelement);
static void gst_v4l2element_dispose (GObject *object);
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 };
static gboolean
gst_v4l2_iface_supported (GstInterface *iface,
GType iface_type)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (iface);
g_assert (iface_type == GST_TYPE_TUNER ||
iface_type == GST_TYPE_X_OVERLAY ||
iface_type == GST_TYPE_COLOR_BALANCE);
if (v4l2element->video_fd == -1)
return FALSE;
if (iface_type == GST_TYPE_X_OVERLAY &&
!GST_V4L2_IS_OVERLAY(v4l2element))
return FALSE;
return TRUE;
}
static void
gst_v4l2_interface_init (GstInterfaceClass *klass)
{
/* default virtual functions */
klass->supported = gst_v4l2_iface_supported;
}
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
};
static const GInterfaceInfo v4l2iface_info = {
(GInterfaceInitFunc) gst_v4l2_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_tuner_info = {
(GInterfaceInitFunc) gst_v4l2_tuner_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_xoverlay_info = {
(GInterfaceInitFunc) gst_v4l2_xoverlay_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_colorbalance_info = {
(GInterfaceInitFunc) gst_v4l2_color_balance_interface_init,
NULL,
NULL,
};
v4l2element_type =
g_type_register_static(GST_TYPE_ELEMENT,
"GstV4l2Element", &v4l2element_info, 0);
g_type_add_interface_static (v4l2element_type,
GST_TYPE_INTERFACE,
&v4l2iface_info);
g_type_add_interface_static (v4l2element_type,
GST_TYPE_TUNER,
&v4l2_tuner_info);
g_type_add_interface_static (v4l2element_type,
GST_TYPE_X_OVERLAY,
&v4l2_xoverlay_info);
g_type_add_interface_static (v4l2element_type,
GST_TYPE_COLOR_BALANCE,
&v4l2_colorbalance_info);
}
return v4l2element_type;
}
#define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ())
GType
gst_v4l2_device_get_type (void)
{
static GType v4l2_device_type = 0;
if (v4l2_device_type == 0) {
static const GFlagsValue values[] = {
{ V4L2_CAP_VIDEO_CAPTURE, "CAPTURE",
"Device can capture" },
{ V4L2_CAP_VIDEO_OUTPUT, "PLAYBACK",
"Device can playback" },
{ V4L2_CAP_VIDEO_OVERLAY, "OVERLAY",
"Device can do overlay" },
{ V4L2_CAP_TUNER, "TUNER",
"Device has a tuner" },
{ V4L2_CAP_AUDIO, "AUDIO",
"Device handles audio" },
{ 0, NULL, NULL }
};
v4l2_device_type =
g_flags_register_static ("GstV4l2DeviceTypeFlags",
values);
}
return v4l2_device_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_DEVICE,
g_param_spec_string("device", "Device", "Device location",
NULL, G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE_NAME,
g_param_spec_string("device_name", "Device name",
"Name of the device", NULL, G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FLAGS,
g_param_spec_flags("flags", "Flags", "Device type flags",
GST_TYPE_V4L2_DEVICE_FLAGS, 0, G_PARAM_READABLE));
/* 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;
gobject_class->dispose = gst_v4l2element_dispose;
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 = g_strdup("/dev/video");
v4l2element->display = g_strdup(g_getenv("DISPLAY"));
v4l2element->channels = NULL;
v4l2element->norms = NULL;
v4l2element->colors = NULL;
v4l2element->overlay = gst_v4l2_xoverlay_new(v4l2element);
}
static void
gst_v4l2element_dispose (GObject *object)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT(object);
if (v4l2element->overlay) {
gst_v4l2_xoverlay_free(v4l2element);
}
if (v4l2element->display) {
g_free (v4l2element->display);
}
if (v4l2element->device) {
g_free (v4l2element->device);
}
if (((GObjectClass *) parent_class)->dispose)
((GObjectClass *) parent_class)->dispose(object);
}
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_DEVICE:
if (!GST_V4L2_IS_OPEN(v4l2element)) {
if (v4l2element->device)
g_free(v4l2element->device);
v4l2element->device = g_strdup(g_value_get_string(value));
}
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;
/* 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_DEVICE:
g_value_set_string(value, v4l2element->device);
break;
case ARG_DEVICE_NAME: {
gchar *new = NULL;
if (GST_V4L2_IS_OPEN(v4l2element))
new = v4l2element->vcap.card;
g_value_set_string(value, new);
break;
}
case ARG_FLAGS: {
guint flags = 0;
if (GST_V4L2_IS_OPEN(v4l2element)) {
flags |= v4l2element->vcap.capabilities &
30007;
}
g_value_set_flags(value, flags);
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:
gst_v4l2_set_display(v4l2element);
if (!gst_v4l2_open(v4l2element))
return GST_STATE_FAILURE;
gst_v4l2_xoverlay_open(v4l2element);
/* emit a signal! whoopie! */
g_signal_emit(G_OBJECT(v4l2element),
gst_v4l2element_signals[SIGNAL_OPEN], 0,
v4l2element->device);
break;
case GST_STATE_READY_TO_NULL:
gst_v4l2_xoverlay_close(v4l2element);
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;
}
gboolean
gst_v4l2element_factory_init (GstPlugin *plugin)
{
GstElementFactory *factory;
/* we can run without... But not yet. ;). */
if (!gst_library_load ("xwindowlistener"))
return FALSE;
/* 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;
}
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