gstreamer/sys/v4l2/gstv4l2element.c

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/*
* GStreamer gstv4l2element.c: base class for V4L2 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>
#include "v4l2_calls.h"
#include "gstv4l2tuner.h"
#ifdef HAVE_XVIDEO
#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"
enum
{
PROP_0,
PROP_DEVICE,
PROP_DEVICE_NAME,
PROP_FLAGS,
PROP_STD,
PROP_INPUT,
PROP_FREQUENCY
};
static void gst_v4l2element_init_interfaces (GType type);
GST_BOILERPLATE_FULL (GstV4l2Element, gst_v4l2element, GstPushSrc,
GST_TYPE_PUSH_SRC, gst_v4l2element_init_interfaces)
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 gboolean gst_v4l2element_start (GstBaseSrc * src);
static gboolean gst_v4l2element_stop (GstBaseSrc * src);
static gboolean
gst_v4l2_iface_supported (GstImplementsInterface * iface,
GType iface_type)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (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 (v4l2element->video_fd == -1)
return FALSE;
#ifdef HAVE_XVIDEO
if (iface_type == GST_TYPE_X_OVERLAY && !GST_V4L2_IS_OVERLAY (v4l2element))
return FALSE;
#endif
return TRUE;
}
static void
gst_v4l2_interface_init (GstImplementsInterfaceClass * klass)
{
/*
* default virtual functions
*/
klass->supported = gst_v4l2_iface_supported;
}
static const GList *
gst_v4l2_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_v4l2_class_probe_devices (GstV4l2ElementClass * klass, gboolean check)
{
static gboolean init = FALSE;
static GList *devices = NULL;
if (!init && !check) {
gchar *dev_base[] = { "/dev/video", "/dev/v4l2/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 (S_ISCHR (s.st_mode)) {
if ((fd = open (device, O_RDWR | O_NONBLOCK)) > 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_v4l2_probe_probe_property (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
switch (prop_id) {
case PROP_DEVICE:
gst_v4l2_class_probe_devices (klass, FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
}
static gboolean
gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
gboolean ret = FALSE;
switch (prop_id) {
case PROP_DEVICE:
ret = !gst_v4l2_class_probe_devices (klass, TRUE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return ret;
}
static GValueArray *
gst_v4l2_class_list_devices (GstV4l2ElementClass * 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_v4l2_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
GValueArray *array = NULL;
switch (prop_id) {
case PROP_DEVICE:
array = gst_v4l2_class_list_devices (klass);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
static void
gst_v4l2_property_probe_interface_init (GstPropertyProbeInterface * iface)
{
iface->get_properties = gst_v4l2_probe_get_properties;
iface->probe_property = gst_v4l2_probe_probe_property;
iface->needs_probe = gst_v4l2_probe_needs_probe;
iface->get_values = gst_v4l2_probe_get_values;
}
#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 supports video capture"},
{V4L2_CAP_VIDEO_OUTPUT, "PLAYBACK",
"Device supports video playback"},
{V4L2_CAP_VIDEO_OVERLAY, "OVERLAY",
"Device supports video overlay"},
{V4L2_CAP_VBI_CAPTURE, "VBI_CAPTURE",
"Device supports the VBI capture"},
{V4L2_CAP_VBI_OUTPUT, "VBI_OUTPUT",
"Device supports the VBI output"},
{V4L2_CAP_TUNER, "TUNER",
"Device has a tuner or modulator"},
{V4L2_CAP_AUDIO, "AUDIO",
"Device has audio inputs or outputs"},
{0, NULL, NULL}
};
v4l2_device_type =
g_flags_register_static ("GstV4l2DeviceTypeFlags", values);
}
return v4l2_device_type;
}
static void
gst_v4l2element_init_interfaces (GType type)
{
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,
};
#ifdef HAVE_XVIDEO
static const GInterfaceInfo v4l2_xoverlay_info = {
(GInterfaceInitFunc) gst_v4l2_xoverlay_interface_init,
NULL,
NULL,
};
#endif
static const GInterfaceInfo v4l2_colorbalance_info = {
(GInterfaceInitFunc) gst_v4l2_color_balance_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_propertyprobe_info = {
(GInterfaceInitFunc) gst_v4l2_property_probe_interface_init,
NULL,
NULL,
};
g_type_add_interface_static (type,
GST_TYPE_IMPLEMENTS_INTERFACE, &v4l2iface_info);
g_type_add_interface_static (type, GST_TYPE_TUNER, &v4l2_tuner_info);
#ifdef HAVE_XVIDEO
g_type_add_interface_static (type, GST_TYPE_X_OVERLAY, &v4l2_xoverlay_info);
#endif
g_type_add_interface_static (type,
GST_TYPE_COLOR_BALANCE, &v4l2_colorbalance_info);
g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
&v4l2_propertyprobe_info);
}
static void
gst_v4l2element_base_init (gpointer g_class)
{
GstV4l2ElementClass *klass = GST_V4L2ELEMENT_CLASS (g_class);
klass->devices = NULL;
}
static void
gst_v4l2element_class_init (GstV4l2ElementClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *basesrc_class;
gobject_class = (GObjectClass *) klass;
basesrc_class = (GstBaseSrcClass *) klass;
gobject_class->set_property = gst_v4l2element_set_property;
gobject_class->get_property = gst_v4l2element_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEVICE,
g_param_spec_string ("device",
"Device", "Device location", NULL, G_PARAM_READWRITE));
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_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FLAGS,
g_param_spec_flags ("flags", "Flags",
"Device type flags",
GST_TYPE_V4L2_DEVICE_FLAGS, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_STD,
g_param_spec_string ("std", "std",
"standard (norm) to use", NULL, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_INPUT,
g_param_spec_string ("input",
"input",
"input/output (channel) to switch to", NULL, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_FREQUENCY,
g_param_spec_ulong ("frequency",
"frequency",
"frequency to tune to (in Hz)", 0, G_MAXULONG, 0, G_PARAM_READWRITE));
basesrc_class->start = gst_v4l2element_start;
basesrc_class->stop = gst_v4l2element_stop;
gobject_class->dispose = gst_v4l2element_dispose;
}
static void
gst_v4l2element_init (GstV4l2Element * v4l2element, GstV4l2ElementClass * klass)
{
/*
* some default values
*/
v4l2element->video_fd = -1;
v4l2element->buffer = NULL;
v4l2element->videodev = g_strdup ("/dev/video0");
v4l2element->stds = NULL;
v4l2element->inputs = NULL;
v4l2element->colors = NULL;
v4l2element->xwindow_id = 0;
}
static void
gst_v4l2element_dispose (GObject * object)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (object);
if (v4l2element->videodev) {
g_free (v4l2element->videodev);
v4l2element->videodev = NULL;
}
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 = GST_V4L2ELEMENT (object);
switch (prop_id) {
case PROP_DEVICE:
if (v4l2element->videodev)
g_free (v4l2element->videodev);
v4l2element->videodev = g_strdup (g_value_get_string (value));
break;
case PROP_STD:
if (GST_V4L2_IS_OPEN (v4l2element)) {
GstTuner *tuner = GST_TUNER (v4l2element);
GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
(gchar *)
g_value_get_string (value));
if (norm) {
gst_tuner_set_norm (tuner, norm);
}
} else {
g_free (v4l2element->std);
v4l2element->std = g_value_dup_string (value);
g_object_notify (object, "std");
}
break;
case PROP_INPUT:
if (GST_V4L2_IS_OPEN (v4l2element)) {
GstTuner *tuner = GST_TUNER (v4l2element);
GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
(gchar *)
g_value_get_string (value));
if (channel) {
gst_tuner_set_channel (tuner, channel);
}
} else {
g_free (v4l2element->input);
v4l2element->input = g_value_dup_string (value);
g_object_notify (object, "input");
}
break;
case PROP_FREQUENCY:
if (GST_V4L2_IS_OPEN (v4l2element)) {
GstTuner *tuner = GST_TUNER (v4l2element);
GstTunerChannel *channel = gst_tuner_get_channel (tuner);
if (channel &&
GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value));
}
} else {
v4l2element->frequency = g_value_get_ulong (value);
g_object_notify (object, "frequency");
}
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 = GST_V4L2ELEMENT (object);
switch (prop_id) {
case PROP_DEVICE:
g_value_set_string (value, v4l2element->videodev);
break;
case PROP_DEVICE_NAME:
{
gchar *new = NULL;
if (GST_V4L2_IS_OPEN (v4l2element))
new = (gchar *) v4l2element->vcap.card;
g_value_set_string (value, new);
break;
}
case PROP_FLAGS:
{
guint flags = 0;
if (GST_V4L2_IS_OPEN (v4l2element)) {
flags |= v4l2element->vcap.capabilities &
(V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
if (v4l2element->vcap.capabilities & V4L2_CAP_AUDIO)
flags |= V4L2_FBUF_CAP_CHROMAKEY;
}
g_value_set_flags (value, flags);
break;
}
case PROP_STD:
g_value_set_string (value, v4l2element->std);
break;
case PROP_INPUT:
g_value_set_string (value, v4l2element->input);
break;
case PROP_FREQUENCY:
g_value_set_ulong (value, v4l2element->frequency);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_v4l2element_start (GstBaseSrc * src)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (src);
if (!gst_v4l2_open (v4l2element))
return FALSE;
#ifdef HAVE_XVIDEO
gst_v4l2_xoverlay_start (v4l2element);
#endif
return TRUE;
}
static gboolean
gst_v4l2element_stop (GstBaseSrc * src)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (src);
#ifdef HAVE_XVIDEO
gst_v4l2_xoverlay_stop (v4l2element);
#endif
if (!gst_v4l2_close (v4l2element))
return FALSE;
return TRUE;
}