gstreamer/sys/v4l/gstv4lelement.c

527 lines
14 KiB
C
Raw Normal View History

/* GStreamer
*
* gstv4lelement.c: base class for V4L elements
*
* Copyright (C) 2001-2002 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 <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include "v4l_calls.h"
#include "gstv4ltuner.h"
#include "gstv4lxoverlay.h"
#include "gstv4lcolorbalance.h"
#include <gst/propertyprobe/propertyprobe.h>
/* elementfactory information */
static GstElementDetails gst_v4lelement_details =
GST_ELEMENT_DETAILS ("Generic video4linux Element",
"Generic/Video",
"Generic plugin for handling common video4linux calls",
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
/* V4lElement 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_v4lelement_base_init (gpointer g_class);
static void gst_v4lelement_class_init (GstV4lElementClass * klass);
static void gst_v4lelement_init (GstV4lElement * v4lelement);
static void gst_v4lelement_dispose (GObject * object);
static void gst_v4lelement_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_v4lelement_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstElementStateReturn gst_v4lelement_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
static guint gst_v4lelement_signals[LAST_SIGNAL] = { 0 };
static gboolean
gst_v4l_iface_supported (GstImplementsInterface * iface, GType iface_type)
{
g_assert (iface_type == GST_TYPE_TUNER ||
iface_type == GST_TYPE_X_OVERLAY || iface_type == GST_TYPE_COLOR_BALANCE);
return TRUE;
}
static void
gst_v4l_interface_init (GstImplementsInterfaceClass * klass)
{
/* default virtual functions */
klass->supported = gst_v4l_iface_supported;
}
static const GList *
gst_v4l_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
if (!list) {
list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
}
return list;
}
static gboolean
gst_v4l_class_probe_devices (GstV4lElementClass * klass, gboolean check)
{
static gboolean init = FALSE;
static GList *devices = NULL;
if (!init && !check) {
gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL };
gint base, n, fd;
while (devices) {
GList *item = devices;
gchar *device = item->data;
devices = g_list_remove (devices, item);
g_free (device);
}
/* detect /dev entries */
for (n = 0; n < 64; n++) {
for (base = 0; dev_base[base] != NULL; base++) {
struct stat s;
gchar *device = g_strdup_printf ("%s%d", dev_base[base], n);
/* does the /dev/ entry exist at all? */
if (stat (device, &s) == 0) {
/* yes: is a device attached? */
if ((fd = open (device, O_RDONLY)) > 0 || errno == EBUSY) {
if (fd > 0)
close (fd);
devices = g_list_append (devices, device);
break;
}
}
g_free (device);
}
}
init = TRUE;
}
klass->devices = devices;
return init;
}
static void
gst_v4l_probe_probe_property (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstV4lElementClass *klass = GST_V4LELEMENT_GET_CLASS (probe);
switch (prop_id) {
case ARG_DEVICE:
gst_v4l_class_probe_devices (klass, FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
}
static gboolean
gst_v4l_probe_needs_probe (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstV4lElementClass *klass = GST_V4LELEMENT_GET_CLASS (probe);
gboolean ret = FALSE;
switch (prop_id) {
case ARG_DEVICE:
ret = !gst_v4l_class_probe_devices (klass, TRUE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return ret;
}
static GValueArray *
gst_v4l_class_list_devices (GstV4lElementClass * klass)
{
GValueArray *array;
GValue value = { 0 };
GList *item;
if (!klass->devices)
return NULL;
array = g_value_array_new (g_list_length (klass->devices));
item = klass->devices;
g_value_init (&value, G_TYPE_STRING);
while (item) {
gchar *device = item->data;
g_value_set_string (&value, device);
g_value_array_append (array, &value);
item = item->next;
}
g_value_unset (&value);
return array;
}
static GValueArray *
gst_v4l_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstV4lElementClass *klass = GST_V4LELEMENT_GET_CLASS (probe);
GValueArray *array = NULL;
switch (prop_id) {
case ARG_DEVICE:
array = gst_v4l_class_list_devices (klass);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
static void
gst_v4l_property_probe_interface_init (GstPropertyProbeInterface * iface)
{
iface->get_properties = gst_v4l_probe_get_properties;
iface->probe_property = gst_v4l_probe_probe_property;
iface->needs_probe = gst_v4l_probe_needs_probe;
iface->get_values = gst_v4l_probe_get_values;
}
#define GST_TYPE_V4L_DEVICE_FLAGS (gst_v4l_device_get_type ())
GType
gst_v4l_device_get_type (void)
{
static GType v4l_device_type = 0;
if (v4l_device_type == 0) {
static const GFlagsValue values[] = {
{VID_TYPE_CAPTURE, "CAPTURE", "Device can capture"},
{VID_TYPE_TUNER, "TUNER", "Device has a tuner"},
{VID_TYPE_OVERLAY, "OVERLAY", "Device can do overlay"},
{VID_TYPE_MPEG_DECODER, "MPEG_DECODER", "Device can decode MPEG"},
{VID_TYPE_MPEG_ENCODER, "MPEG_ENCODER", "Device can encode MPEG"},
{VID_TYPE_MJPEG_DECODER, "MJPEG_DECODER", "Device can decode MJPEG"},
{VID_TYPE_MJPEG_ENCODER, "MJPEG_ENCODER", "Device can encode MJPEG"},
{0x10000, "AUDIO", "Device handles audio"},
{0, NULL, NULL}
};
v4l_device_type = g_flags_register_static ("GstV4lDeviceTypeFlags", values);
}
return v4l_device_type;
}
GType
gst_v4lelement_get_type (void)
{
static GType v4lelement_type = 0;
if (!v4lelement_type) {
static const GTypeInfo v4lelement_info = {
sizeof (GstV4lElementClass),
gst_v4lelement_base_init,
NULL,
(GClassInitFunc) gst_v4lelement_class_init,
NULL,
NULL,
sizeof (GstV4lElement),
0,
(GInstanceInitFunc) gst_v4lelement_init,
NULL
};
static const GInterfaceInfo v4liface_info = {
(GInterfaceInitFunc) gst_v4l_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l_tuner_info = {
(GInterfaceInitFunc) gst_v4l_tuner_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l_xoverlay_info = {
(GInterfaceInitFunc) gst_v4l_xoverlay_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l_colorbalance_info = {
(GInterfaceInitFunc) gst_v4l_color_balance_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l_propertyprobe_info = {
(GInterfaceInitFunc) gst_v4l_property_probe_interface_init,
NULL,
NULL,
};
v4lelement_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstV4lElement", &v4lelement_info, 0);
g_type_add_interface_static (v4lelement_type,
GST_TYPE_IMPLEMENTS_INTERFACE, &v4liface_info);
g_type_add_interface_static (v4lelement_type,
GST_TYPE_TUNER, &v4l_tuner_info);
g_type_add_interface_static (v4lelement_type,
GST_TYPE_X_OVERLAY, &v4l_xoverlay_info);
g_type_add_interface_static (v4lelement_type,
GST_TYPE_COLOR_BALANCE, &v4l_colorbalance_info);
g_type_add_interface_static (v4lelement_type,
GST_TYPE_PROPERTY_PROBE, &v4l_propertyprobe_info);
}
return v4lelement_type;
}
static void
gst_v4lelement_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
GstV4lElementClass *klass = GST_V4LELEMENT_CLASS (g_class);
klass->devices = NULL;
gst_element_class_set_details (gstelement_class, &gst_v4lelement_details);
}
static void
gst_v4lelement_class_init (GstV4lElementClass * 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_V4L_DEVICE_FLAGS, 0, G_PARAM_READABLE));
/* signals */
gst_v4lelement_signals[SIGNAL_OPEN] =
g_signal_new ("open", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstV4lElementClass, open),
NULL, NULL, g_cclosure_marshal_VOID__STRING,
G_TYPE_NONE, 1, G_TYPE_STRING);
gst_v4lelement_signals[SIGNAL_CLOSE] =
g_signal_new ("close", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstV4lElementClass, close),
NULL, NULL, g_cclosure_marshal_VOID__STRING,
G_TYPE_NONE, 1, G_TYPE_STRING);
gobject_class->set_property = gst_v4lelement_set_property;
gobject_class->get_property = gst_v4lelement_get_property;
gstelement_class->change_state = gst_v4lelement_change_state;
gobject_class->dispose = gst_v4lelement_dispose;
}
static void
gst_v4lelement_init (GstV4lElement * v4lelement)
{
/* some default values */
v4lelement->video_fd = -1;
v4lelement->buffer = NULL;
v4lelement->videodev = g_strdup ("/dev/video0");
v4lelement->display = g_strdup (g_getenv ("DISPLAY"));
v4lelement->norms = NULL;
v4lelement->channels = NULL;
v4lelement->colors = NULL;
v4lelement->overlay = gst_v4l_xoverlay_new (v4lelement);
}
static void
gst_v4lelement_dispose (GObject * object)
{
GstV4lElement *v4lelement = GST_V4LELEMENT (object);
gst_v4l_xoverlay_free (v4lelement);
if (v4lelement->display) {
g_free (v4lelement->display);
}
if (v4lelement->videodev) {
g_free (v4lelement->videodev);
}
if (((GObjectClass *) parent_class)->dispose)
((GObjectClass *) parent_class)->dispose (object);
}
static void
gst_v4lelement_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4lElement *v4lelement;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_V4LELEMENT (object));
v4lelement = GST_V4LELEMENT (object);
switch (prop_id) {
case ARG_DEVICE:
if (v4lelement->videodev)
g_free (v4lelement->videodev);
v4lelement->videodev = g_strdup (g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_v4lelement_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4lElement *v4lelement;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_V4LELEMENT (object));
v4lelement = GST_V4LELEMENT (object);
switch (prop_id) {
case ARG_DEVICE:
g_value_set_string (value, v4lelement->videodev);
break;
case ARG_DEVICE_NAME:{
gchar *new = NULL;
if (GST_V4L_IS_OPEN (v4lelement))
new = v4lelement->vcap.name;
g_value_set_string (value, new);
break;
}
case ARG_FLAGS:{
guint flags = 0;
if (GST_V4L_IS_OPEN (v4lelement)) {
flags |= v4lelement->vcap.type & 0x3C0B;
if (v4lelement->vcap.audios)
flags |= 0x10000;
}
g_value_set_flags (value, flags);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_v4lelement_change_state (GstElement * element)
{
GstV4lElement *v4lelement;
g_return_val_if_fail (GST_IS_V4LELEMENT (element), GST_STATE_FAILURE);
v4lelement = GST_V4LELEMENT (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_v4l_set_overlay (v4lelement);
if (!gst_v4l_open (v4lelement))
return GST_STATE_FAILURE;
gst_v4l_xoverlay_open (v4lelement);
g_signal_emit (G_OBJECT (v4lelement),
gst_v4lelement_signals[SIGNAL_OPEN], 0, v4lelement->videodev);
break;
case GST_STATE_READY_TO_NULL:
gst_v4l_xoverlay_close (v4lelement);
if (!gst_v4l_close (v4lelement))
return GST_STATE_FAILURE;
g_signal_emit (G_OBJECT (v4lelement),
gst_v4lelement_signals[SIGNAL_CLOSE], 0, v4lelement->videodev);
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}