gstreamer/sys/v4l/gstv4lelement.c
Filippo Argiolas 0f29d71a7d v4lsrc: optional support for device probing with gudev
Enumerate v4l devices using gudev if available.

Fixes bug #583640.
2009-07-13 16:13:25 +02:00

552 lines
14 KiB
C

/* 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 <gst/interfaces/propertyprobe.h>
#ifdef HAVE_GUDEV
#include <gudev/gudev.h>
#endif
#include "v4l_calls.h"
#include "gstv4ltuner.h"
#ifdef HAVE_XVIDEO
#include "gstv4lxoverlay.h"
#endif
#include "gstv4lcolorbalance.h"
enum
{
PROP_0,
PROP_DEVICE,
PROP_DEVICE_NAME,
PROP_FLAGS
};
GST_DEBUG_CATEGORY (v4lelement_debug);
#define GST_CAT_DEFAULT v4lelement_debug
static void gst_v4lelement_init_interfaces (GType type);
GST_BOILERPLATE_FULL (GstV4lElement, gst_v4lelement, GstPushSrc,
GST_TYPE_PUSH_SRC, gst_v4lelement_init_interfaces);
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);
/* element methods */
static GstStateChangeReturn gst_v4lelement_change_state (GstElement * element,
GstStateChange transition);
static gboolean
gst_v4l_iface_supported (GstImplementsInterface * iface, GType iface_type)
{
GstV4lElement *v4lelement = GST_V4LELEMENT (iface);
#ifdef HAVE_XVIDEO
g_assert (iface_type == GST_TYPE_TUNER ||
iface_type == GST_TYPE_X_OVERLAY || iface_type == GST_TYPE_COLOR_BALANCE);
#else
g_assert (iface_type == GST_TYPE_TUNER ||
iface_type == GST_TYPE_COLOR_BALANCE);
#endif
if (v4lelement->video_fd == -1)
return FALSE;
#ifdef HAVE_XVIDEO
if (iface_type == GST_TYPE_X_OVERLAY && !GST_V4L_IS_OVERLAY (v4lelement))
return FALSE;
#endif
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 init = FALSE;
static GList *devices = NULL;
#ifdef HAVE_GUDEV
static gboolean
gst_v4l_class_probe_devices_with_udev (GstV4lElementClass * klass,
gboolean check)
{
GUdevClient *client;
GList *item;
if (!check) {
while (devices) {
gchar *device = devices->data;
devices = g_list_remove (devices, device);
g_free (device);
}
GST_INFO ("Enumerating video4linux devices from udev");
client = g_udev_client_new (NULL);
if (!client) {
GST_WARNING ("Failed to initialize gudev client");
goto finish;
}
item = g_udev_client_query_by_subsystem (client, "video4linux");
while (item) {
GUdevDevice *device = item->data;
gchar *devnode = g_strdup (g_udev_device_get_device_file (device));
gint api = g_udev_device_get_property_as_int (device, "ID_V4L_VERSION");
GST_INFO ("Found new device: %s, API: %d", devnode, api);
/* Append v4l1 devices only. If api is 0 probably v4l_id has
been stripped out of the current udev installation, append
anyway */
if (api == 0) {
GST_WARNING
("Couldn't retrieve ID_V4L_VERSION, silly udev installation?");
}
if ((api == 1 || api == 0)) {
devices = g_list_append (devices, devnode);
} else {
g_free (devnode);
}
g_object_unref (device);
item = item->next;
}
g_list_free (item);
init = TRUE;
}
finish:
if (client) {
g_object_unref (client);
}
klass->devices = devices;
return init;
}
#endif /* HAVE_GUDEV */
static gboolean
gst_v4l_class_probe_devices (GstV4lElementClass * klass, gboolean check)
{
if (!check) {
gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL };
gint base, n, fd;
while (devices) {
gchar *device = devices->data;
devices = g_list_remove (devices, device);
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 PROP_DEVICE:
#ifdef HAVE_GUDEV
if (!gst_v4l_class_probe_devices_with_udev (klass, FALSE))
gst_v4l_class_probe_devices (klass, FALSE);
#else /* !HAVE_GUDEV */
gst_v4l_class_probe_devices (klass, FALSE);
#endif /* HAVE_GUDEV */
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 PROP_DEVICE:
#ifdef HAVE_GUDEV
ret = !gst_v4l_class_probe_devices_with_udev (klass, FALSE);
#else /* !HAVE_GUDEV */
ret = !gst_v4l_class_probe_devices (klass, TRUE);
#endif /* HAVE_GUDEV */
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 PROP_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 ())
static 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;
}
static void
gst_v4lelement_init_interfaces (GType type)
{
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,
};
#ifdef HAVE_XVIDEO
static const GInterfaceInfo v4l_xoverlay_info = {
(GInterfaceInitFunc) gst_v4l_xoverlay_interface_init,
NULL,
NULL,
};
#endif
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,
};
g_type_add_interface_static (type,
GST_TYPE_IMPLEMENTS_INTERFACE, &v4liface_info);
g_type_add_interface_static (type, GST_TYPE_TUNER, &v4l_tuner_info);
#ifdef HAVE_XVIDEO
g_type_add_interface_static (type, GST_TYPE_X_OVERLAY, &v4l_xoverlay_info);
#endif
g_type_add_interface_static (type,
GST_TYPE_COLOR_BALANCE, &v4l_colorbalance_info);
g_type_add_interface_static (type,
GST_TYPE_PROPERTY_PROBE, &v4l_propertyprobe_info);
}
static void
gst_v4lelement_base_init (gpointer g_class)
{
GstV4lElementClass *klass = GST_V4LELEMENT_CLASS (g_class);
klass->devices = NULL;
GST_DEBUG_CATEGORY_INIT (v4lelement_debug, "v4lelement", 0,
"V4L Base Class debug");
}
static void
gst_v4lelement_class_init (GstV4lElementClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_v4lelement_set_property;
gobject_class->get_property = gst_v4lelement_get_property;
gobject_class->dispose = gst_v4lelement_dispose;
element_class->change_state = gst_v4lelement_change_state;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEVICE,
g_param_spec_string ("device", "Device", "Device location",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEVICE_NAME,
g_param_spec_string ("device-name", "Device name", "Name of the device",
NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FLAGS,
g_param_spec_flags ("flags", "Flags", "Device type flags",
GST_TYPE_V4L_DEVICE_FLAGS, 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_v4lelement_init (GstV4lElement * v4lelement, GstV4lElementClass * klass)
{
/* some default values */
v4lelement->video_fd = -1;
v4lelement->buffer = NULL;
v4lelement->videodev = g_strdup ("/dev/video0");
v4lelement->norms = NULL;
v4lelement->channels = NULL;
v4lelement->colors = NULL;
v4lelement->xwindow_id = 0;
}
static void
gst_v4lelement_dispose (GObject * object)
{
GstV4lElement *v4lelement = GST_V4LELEMENT (object);
if (v4lelement->videodev) {
g_free (v4lelement->videodev);
v4lelement->videodev = NULL;
}
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 = GST_V4LELEMENT (object);
switch (prop_id) {
case PROP_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 = GST_V4LELEMENT (object);
switch (prop_id) {
case PROP_DEVICE:
g_value_set_string (value, v4lelement->videodev);
break;
case PROP_DEVICE_NAME:{
gchar *new = NULL;
if (GST_V4L_IS_OPEN (v4lelement)) {
new = v4lelement->vcap.name;
} else if (gst_v4l_open (v4lelement)) {
new = v4lelement->vcap.name;
gst_v4l_close (v4lelement);
}
g_value_set_string (value, new);
break;
}
case PROP_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 GstStateChangeReturn
gst_v4lelement_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstV4lElement *v4lelement = GST_V4LELEMENT (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
/* open the device */
if (!gst_v4l_open (v4lelement))
return GST_STATE_CHANGE_FAILURE;
#ifdef HAVE_XVIDEO
gst_v4l_xoverlay_start (v4lelement);
#endif
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
/* close the device */
#ifdef HAVE_XVIDEO
gst_v4l_xoverlay_stop (v4lelement);
#endif
if (!gst_v4l_close (v4lelement))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
return ret;
}