gstreamer/gst-libs/gst/tuner/tuner.c

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/* GStreamer Tuner
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* tuner.c: tuner design virtual class function wrappers
*
* 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 "tuner.h"
#include "tuner-marshal.h"
#include <string.h>
enum {
NORM_CHANGED,
CHANNEL_CHANGED,
FREQUENCY_CHANGED,
SIGNAL_CHANGED,
LAST_SIGNAL
};
static void gst_tuner_class_init (GstTunerClass *klass);
static guint gst_tuner_signals[LAST_SIGNAL] = { 0 };
GType
gst_tuner_get_type (void)
{
static GType gst_tuner_type = 0;
if (!gst_tuner_type) {
static const GTypeInfo gst_tuner_info = {
sizeof (GstTunerClass),
(GBaseInitFunc) gst_tuner_class_init,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
};
gst_tuner_type = g_type_register_static (G_TYPE_INTERFACE,
"GstTuner",
&gst_tuner_info, 0);
g_type_interface_add_prerequisite (gst_tuner_type,
GST_TYPE_IMPLEMENTS_INTERFACE);
}
return gst_tuner_type;
}
static void
gst_tuner_class_init (GstTunerClass *klass)
{
static gboolean initialized = FALSE;
if (!initialized) {
gst_tuner_signals[NORM_CHANGED] =
g_signal_new ("norm-changed",
GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstTunerClass, norm_changed),
NULL, NULL,
g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_TUNER_NORM);
gst_tuner_signals[CHANNEL_CHANGED] =
g_signal_new ("channel-changed",
GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstTunerClass, channel_changed),
NULL, NULL,
g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_TUNER_CHANNEL);
gst_tuner_signals[FREQUENCY_CHANGED] =
g_signal_new ("frequency-changed",
GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstTunerClass, frequency_changed),
NULL, NULL,
gst_tuner_marshal_VOID__OBJECT_ULONG, G_TYPE_NONE, 2,
GST_TYPE_TUNER_CHANNEL, G_TYPE_ULONG);
gst_tuner_signals[SIGNAL_CHANGED] =
g_signal_new ("signal-changed",
GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstTunerClass, signal_changed),
NULL, NULL,
gst_tuner_marshal_VOID__OBJECT_INT, G_TYPE_NONE, 2,
GST_TYPE_TUNER_CHANNEL, G_TYPE_INT);
initialized = TRUE;
}
/* default virtual functions */
klass->list_channels = NULL;
klass->set_channel = NULL;
klass->get_channel = NULL;
klass->list_norms = NULL;
klass->set_norm = NULL;
klass->get_norm = NULL;
klass->set_frequency = NULL;
klass->get_frequency = NULL;
klass->signal_strength = NULL;
}
/**
* gst_tuner_list_channels:
* @tuner: the #GstTuner (a #GstElement) to get the channels from.
*
* Retrieve a list of channels (e.g. 'composite', 's-video', ...)
* from the given tuner object.
*
* Returns: a list of channels available on this tuner.
*/
const GList *
gst_tuner_list_channels (GstTuner *tuner)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
if (klass->list_channels) {
return klass->list_channels (tuner);
}
return NULL;
}
/**
* gst_tuner_set_channel:
* @tuner: the #GstTuner (a #GstElement) that owns the channel.
* @channel: the channel to tune to.
*
* Tunes the object to the given channel.
*/
void
gst_tuner_set_channel (GstTuner *tuner,
GstTunerChannel *channel)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
if (klass->set_channel) {
klass->set_channel (tuner, channel);
}
}
/**
* gst_Tuner_get_channel:
* @tuner: the #GstTuner (a #GstElement) to get the current channel from.
*
* Retrieve the current channel from the tuner.
*
* Returns: the current channel of the tuner object.
*/
GstTunerChannel *
gst_tuner_get_channel (GstTuner *tuner)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
if (klass->get_channel) {
return klass->get_channel (tuner);
}
return NULL;
}
/**
* gst_tuner_get_norms_list:
* @tuner: the #GstTuner (*a #GstElement) to get the list of norms from.
*
* Retrieve a list of available norms on the currently tuned channel
* from the given tuner object.
*
* Returns: A list of norms available on the current channel for this
* tuner object.
*/
const GList *
gst_tuner_list_norms (GstTuner *tuner)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
if (klass->list_norms) {
return klass->list_norms (tuner);
}
return NULL;
}
/**
* gst_tuner_set_norm:
* @tuner: the #GstTuner (a #GstElement) to set the norm on.
* @norm: the norm to use for the current channel.
*
* Changes the video norm on this tuner to the given norm.
*/
void
gst_tuner_set_norm (GstTuner *tuner,
GstTunerNorm *norm)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
if (klass->set_norm) {
klass->set_norm (tuner, norm);
}
}
/**
* gst_tuner_get_norm:
* @tuner: the #GstTuner (a #GstElement) to get the current norm from.
*
* Get the current video norm from the given tuner object for the
* currently selected channel.
*
* Returns: the current norm.
*/
GstTunerNorm *
gst_tuner_get_norm (GstTuner *tuner)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
if (klass->get_norm) {
return klass->get_norm (tuner);
}
return NULL;
}
/**
* gst_tuner_set_frequency:
* @tuner: the #Gsttuner (a #GstElement) that owns the given channel.
* @channel: the #GstTunerChannel to set the frequency on.
* @frequency: the frequency to tune in to.
*
* Sets a tuning frequency on the given tuner/channel. Note that this
* requires the given channel to be a "tuning" channel, which can be
* checked using GST_TUNER_CHANNEL_HAS_FLAG (), with the proper flag
* being GST_TUNER_CHANNEL_FREQUENCY.
*/
void
gst_tuner_set_frequency (GstTuner *tuner,
GstTunerChannel *channel,
gulong frequency)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
g_return_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
GST_TUNER_CHANNEL_FREQUENCY));
if (klass->set_frequency) {
klass->set_frequency (tuner, channel, frequency);
}
}
/**
* gst_tuner_get_frequency:
* @tuner: the #GstTuner (a #GstElement) that owns the given channel.
* @channel: the #GstTunerChannel to retrieve the frequency from.
*
* Retrieve the current frequency from the given channel. The same
* applies as for set_frequency (): check the flag.
*
* Returns: the current frequency, or 0 on error.
*/
gulong
gst_tuner_get_frequency (GstTuner *tuner,
GstTunerChannel *channel)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
GST_TUNER_CHANNEL_FREQUENCY), 0);
if (klass->get_frequency) {
return klass->get_frequency (tuner, channel);
}
return 0;
}
/**
* gst_tuner_get_signal_strength:
* @tuner: the #GstTuner (a #GstElement) that owns the given channel.
* @channel: the #GstTunerChannel to get the signal strength from.
*
* get the strength of the signal on this channel. Note that this
* requires the current channel to be a "tuning" channel, e.g. a
* channel on which frequency can be set. This can be checked using
* GST_TUNER_CHANNEL_HAS_FLAG (), and the appropriate flag to check
* for is GST_TUNER_CHANNEL_FREQUENCY.
*
* Returns: signal strength, or 0 on error.
*/
gint
gst_tuner_signal_strength (GstTuner *tuner,
GstTunerChannel *channel)
{
GstTunerClass *klass = GST_TUNER_GET_CLASS (tuner);
g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
GST_TUNER_CHANNEL_FREQUENCY), 0);
if (klass->signal_strength) {
return klass->signal_strength (tuner, channel);
}
return 0;
}
GstTunerNorm *
gst_tuner_find_norm_by_name (GstTuner *tuner,
gchar *norm)
{
GList *walk;
g_return_val_if_fail (GST_TUNER (tuner), NULL);
g_return_val_if_fail (norm != NULL, NULL);
walk = (GList *) gst_tuner_list_norms (tuner);
while (walk) {
if (strcmp (GST_TUNER_NORM (walk->data)->label, norm) == 0)
return GST_TUNER_NORM (walk->data);
walk = g_list_next (walk);
}
return NULL;
}
GstTunerChannel *
gst_tuner_find_channel_by_name (GstTuner *tuner,
gchar *channel)
{
GList *walk;
g_return_val_if_fail (GST_TUNER (tuner), NULL);
g_return_val_if_fail (channel != NULL, NULL);
walk = (GList *) gst_tuner_list_channels (tuner);
while (walk) {
if (strcmp (GST_TUNER_CHANNEL (walk->data)->label, channel) == 0)
return GST_TUNER_CHANNEL (walk->data);
walk = g_list_next (walk);
}
return NULL;
}
void
gst_tuner_channel_changed (GstTuner *tuner,
GstTunerChannel *channel)
{
g_return_if_fail (GST_IS_TUNER (tuner));
g_return_if_fail (GST_IS_TUNER_CHANNEL (channel));
g_signal_emit (G_OBJECT (tuner),
gst_tuner_signals[CHANNEL_CHANGED], 0,
channel);
}
void
gst_tuner_norm_changed (GstTuner *tuner,
GstTunerNorm *norm)
{
g_return_if_fail (GST_IS_TUNER (tuner));
g_return_if_fail (GST_IS_TUNER_NORM (norm));
g_signal_emit (G_OBJECT (tuner),
gst_tuner_signals[NORM_CHANGED], 0,
norm);
}
void
gst_tuner_frequency_changed (GstTuner *tuner,
GstTunerChannel *channel,
gulong frequency)
{
g_return_if_fail (GST_IS_TUNER (tuner));
g_return_if_fail (GST_IS_TUNER_CHANNEL (channel));
g_signal_emit (G_OBJECT (tuner),
gst_tuner_signals[FREQUENCY_CHANGED], 0,
channel, frequency);
g_signal_emit_by_name (G_OBJECT (channel),
"frequency_changed",
frequency);
}
void
gst_tuner_signal_changed (GstTuner *tuner,
GstTunerChannel *channel,
gint signal)
{
g_return_if_fail (GST_IS_TUNER (tuner));
g_return_if_fail (GST_IS_TUNER_CHANNEL (channel));
g_signal_emit (G_OBJECT (tuner),
gst_tuner_signals[SIGNAL_CHANGED], 0,
channel, signal);
g_signal_emit_by_name (G_OBJECT (channel),
"signal_changed",
signal);
}