gstreamer/sys/v4l2/gstv4l2tuner.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

361 lines
10 KiB
C

/* GStreamer Tuner interface implementation
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* gstv4l2tuner.c: tuner interface implementation for V4L2
*
* 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 <gst/gst.h>
#include <gst/tuner/tuner.h>
#include "gstv4l2tuner.h"
#include "gstv4l2element.h"
#include "v4l2_calls.h"
static void gst_v4l2_tuner_channel_class_init (GstV4l2TunerChannelClass *klass);
static void gst_v4l2_tuner_channel_init (GstV4l2TunerChannel *channel);
static void gst_v4l2_tuner_norm_class_init (GstV4l2TunerNormClass *klass);
static void gst_v4l2_tuner_norm_init (GstV4l2TunerNorm *norm);
static const GList *
gst_v4l2_tuner_list_channels (GstTuner *mixer);
static void gst_v4l2_tuner_set_channel (GstTuner *mixer,
GstTunerChannel *channel);
static const GstTunerChannel *
gst_v4l2_tuner_get_channel (GstTuner *mixer);
static const GList *
gst_v4l2_tuner_list_norms (GstTuner *mixer);
static void gst_v4l2_tuner_set_norm (GstTuner *mixer,
GstTunerNorm *norm);
static const GstTunerNorm *
gst_v4l2_tuner_get_norm (GstTuner *mixer);
static void gst_v4l2_tuner_set_frequency (GstTuner *mixer,
GstTunerChannel *channel,
gulong frequency);
static gulong gst_v4l2_tuner_get_frequency (GstTuner *mixer,
GstTunerChannel *channel);
static gint gst_v4l2_tuner_signal_strength (GstTuner *mixer,
GstTunerChannel *channel);
static GstTunerNormClass *norm_parent_class = NULL;
static GstTunerChannelClass *channel_parent_class = NULL;
GType
gst_v4l2_tuner_channel_get_type (void)
{
static GType gst_v4l2_tuner_channel_type = 0;
if (!gst_v4l2_tuner_channel_type) {
static const GTypeInfo v4l2_tuner_channel_info = {
sizeof (GstV4l2TunerChannelClass),
NULL,
NULL,
(GClassInitFunc) gst_v4l2_tuner_channel_class_init,
NULL,
NULL,
sizeof (GstV4l2TunerChannel),
0,
(GInstanceInitFunc) gst_v4l2_tuner_channel_init,
NULL
};
gst_v4l2_tuner_channel_type =
g_type_register_static (GST_TYPE_TUNER_CHANNEL,
"GstV4l2TunerChannel",
&v4l2_tuner_channel_info, 0);
}
return gst_v4l2_tuner_channel_type;
}
static void
gst_v4l2_tuner_channel_class_init (GstV4l2TunerChannelClass *klass)
{
channel_parent_class = g_type_class_ref (GST_TYPE_TUNER_CHANNEL);
}
static void
gst_v4l2_tuner_channel_init (GstV4l2TunerChannel *channel)
{
channel->index = 0;
channel->tuner = 0;
channel->audio = 0;
}
GType
gst_v4l2_tuner_norm_get_type (void)
{
static GType gst_v4l2_tuner_norm_type = 0;
if (!gst_v4l2_tuner_norm_type) {
static const GTypeInfo v4l2_tuner_norm_info = {
sizeof (GstV4l2TunerNormClass),
NULL,
NULL,
(GClassInitFunc) gst_v4l2_tuner_norm_class_init,
NULL,
NULL,
sizeof (GstV4l2TunerNorm),
0,
(GInstanceInitFunc) gst_v4l2_tuner_norm_init,
NULL
};
gst_v4l2_tuner_norm_type =
g_type_register_static (GST_TYPE_TUNER_NORM,
"GstV4l2TunerNorm",
&v4l2_tuner_norm_info, 0);
}
return gst_v4l2_tuner_norm_type;
}
static void
gst_v4l2_tuner_norm_class_init (GstV4l2TunerNormClass *klass)
{
norm_parent_class = g_type_class_ref (GST_TYPE_TUNER_NORM);
}
static void
gst_v4l2_tuner_norm_init (GstV4l2TunerNorm *norm)
{
norm->index = 0;
}
void
gst_v4l2_tuner_interface_init (GstTunerClass *klass)
{
/* default virtual functions */
klass->list_channels = gst_v4l2_tuner_list_channels;
klass->set_channel = gst_v4l2_tuner_set_channel;
klass->get_channel = gst_v4l2_tuner_get_channel;
klass->list_norms = gst_v4l2_tuner_list_norms;
klass->set_norm = gst_v4l2_tuner_set_norm;
klass->get_norm = gst_v4l2_tuner_get_norm;
klass->set_frequency = gst_v4l2_tuner_set_frequency;
klass->get_frequency = gst_v4l2_tuner_get_frequency;
klass->signal_strength = gst_v4l2_tuner_signal_strength;
}
static gboolean
gst_v4l2_tuner_is_sink (GstV4l2Element *v4l2element)
{
const GList *pads = gst_element_get_pad_list (GST_ELEMENT (v4l2element));
GstPadDirection dir = GST_PAD_UNKNOWN;
/* get direction */
if (pads && g_list_length ((GList *) pads) == 1)
dir = GST_PAD_DIRECTION (GST_PAD (pads->data));
return (dir == GST_PAD_SINK);
}
static gboolean
gst_v4l2_tuner_contains_channel (GstV4l2Element *v4l2element,
GstV4l2TunerChannel *v4l2channel)
{
const GList *item;
for (item = v4l2element->channels; item != NULL; item = item->next)
if (item->data == v4l2channel)
return TRUE;
return FALSE;
}
static const GList *
gst_v4l2_tuner_list_channels (GstTuner *mixer)
{
/* ... or output, if we're a sink... */
return GST_V4L2ELEMENT (mixer)->channels;
}
static void
gst_v4l2_tuner_set_channel (GstTuner *mixer,
GstTunerChannel *channel)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
/* assert that we're opened and that we're using a known item */
g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
g_return_if_fail (gst_v4l2_tuner_contains_channel (v4l2element, v4l2channel));
/* ... or output, if we're a sink... */
if (gst_v4l2_tuner_is_sink (v4l2element))
gst_v4l2_set_output (v4l2element, v4l2channel->index);
else
gst_v4l2_set_input (v4l2element, v4l2channel->index);
}
static const GstTunerChannel *
gst_v4l2_tuner_get_channel (GstTuner *mixer)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GList *item;
gint channel;
/* assert that we're opened and that we're using a known item */
g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), NULL);
/* ... or output, if we're a sink... */
if (gst_v4l2_tuner_is_sink (v4l2element))
gst_v4l2_get_output (v4l2element, &channel);
else
gst_v4l2_get_input (v4l2element, &channel);
for (item = v4l2element->channels; item != NULL; item = item->next) {
if (channel == GST_V4L2_TUNER_CHANNEL (item->data)->index)
return (const GstTunerChannel *) item->data;
}
return NULL;
}
static gboolean
gst_v4l2_tuner_contains_norm (GstV4l2Element *v4l2element,
GstV4l2TunerNorm *v4l2norm)
{
const GList *item;
for (item = v4l2element->norms; item != NULL; item = item->next)
if (item->data == v4l2norm)
return TRUE;
return FALSE;
}
static const GList *
gst_v4l2_tuner_list_norms (GstTuner *mixer)
{
return GST_V4L2ELEMENT (mixer)->norms;
}
static void
gst_v4l2_tuner_set_norm (GstTuner *mixer,
GstTunerNorm *norm)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GstV4l2TunerNorm *v4l2norm = GST_V4L2_TUNER_NORM (norm);
/* assert that we're opened and that we're using a known item */
g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
g_return_if_fail (gst_v4l2_tuner_contains_norm (v4l2element, v4l2norm));
gst_v4l2_set_norm (v4l2element, v4l2norm->index);
}
static const GstTunerNorm *
gst_v4l2_tuner_get_norm (GstTuner *mixer)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GList *item;
v4l2_std_id norm;
/* assert that we're opened and that we're using a known item */
g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), NULL);
gst_v4l2_get_norm (v4l2element, &norm);
for (item = v4l2element->norms; item != NULL; item = item->next) {
if (norm == GST_V4L2_TUNER_NORM (item->data)->index)
return (const GstTunerNorm *) item->data;
}
return NULL;
}
static void
gst_v4l2_tuner_set_frequency (GstTuner *mixer,
GstTunerChannel *channel,
gulong frequency)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
gint chan;
/* assert that we're opened and that we're using a known item */
g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
g_return_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
GST_TUNER_CHANNEL_FREQUENCY));
g_return_if_fail (gst_v4l2_tuner_contains_channel (v4l2element, v4l2channel));
gst_v4l2_get_input (v4l2element, &chan);
if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
gst_v4l2_set_frequency (v4l2element, v4l2channel->tuner, frequency);
}
}
static gulong
gst_v4l2_tuner_get_frequency (GstTuner *mixer,
GstTunerChannel *channel)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
gint chan;
gulong frequency = 0;
/* assert that we're opened and that we're using a known item */
g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
GST_TUNER_CHANNEL_FREQUENCY), 0);
g_return_val_if_fail (gst_v4l2_tuner_contains_channel (v4l2element,
v4l2channel), 0);
gst_v4l2_get_input (v4l2element, &chan);
if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
gst_v4l2_get_frequency (v4l2element, v4l2channel->tuner, &frequency);
}
return frequency;
}
static gint
gst_v4l2_tuner_signal_strength (GstTuner *mixer,
GstTunerChannel *channel)
{
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
gint chan;
gulong signal = 0;
/* assert that we're opened and that we're using a known item */
g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
GST_TUNER_CHANNEL_FREQUENCY), 0);
g_return_val_if_fail (gst_v4l2_tuner_contains_channel (v4l2element,
v4l2channel), 0);
gst_v4l2_get_input (v4l2element, &chan);
if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
gst_v4l2_signal_strength (v4l2element, v4l2channel->tuner, &signal);
}
return signal;
}