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574 lines
16 KiB
C
574 lines
16 KiB
C
/* GStreamer Tuner
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* tuner.c: tuner design virtual class function wrappers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "tuner.h"
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#include "interfaces-marshal.h"
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#include <string.h>
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/**
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* SECTION:gsttuner
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* @short_description: Interface for elements providing tuner operations
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*
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* <refsect2>
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* <para>
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* The GstTuner interface is provided by elements that have the ability to
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* tune into multiple input signals, for example TV or radio capture cards.
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* </para><para>
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* The interpretation of 'tuning into' an input stream depends on the element
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* implementing the interface. For v4lsrc, it might imply selection of an
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* input source and/or frequency to be configured on a TV card. Another
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* GstTuner implementation might be to allow selection of an active input pad
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* from multiple input pads.
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* </para><para>
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* That said, the GstTuner interface functions are biased toward the
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* TV capture scenario.
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* </para><para>
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* The general parameters provided are for configuration are:
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* <itemizedlist>
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* <listitem>Selection of a current #GstTunerChannel. The current channel
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* represents the input source (e.g. Composite, S-Video etc for TV capture).
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* </listitem>
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* <listitem>The #GstTunerNorm for the channel. The norm chooses the
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* interpretation of the incoming signal for the current channel. For example,
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* PAL or NTSC, or more specific variants there-of.
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* </listitem>
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* <listitem>Channel frequency. If the current channel has the ability to tune
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* between multiple frequencies (if it has the GST_TUNER_CHANNEL_FREQUENCY flag)
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* then the frequency can be changed/retrieved via the
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* gst_tuner_set_frequency() and gst_tuner_get_frequency() methods.
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* </listitem>
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* </itemizedlist>
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* </para>
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* <para>
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* Where applicable, the signal strength can be retrieved and/or monitored
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* via a signal.
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* </para>
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* </refsect2>
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*/
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enum
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{
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NORM_CHANGED,
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CHANNEL_CHANGED,
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FREQUENCY_CHANGED,
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SIGNAL_CHANGED,
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LAST_SIGNAL
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};
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static void gst_tuner_class_init (GstTunerClass * klass);
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static guint gst_tuner_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_tuner_get_type (void)
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{
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static GType gst_tuner_type = 0;
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if (!gst_tuner_type) {
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static const GTypeInfo gst_tuner_info = {
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sizeof (GstTunerClass),
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(GBaseInitFunc) gst_tuner_class_init,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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0,
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NULL,
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};
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gst_tuner_type = g_type_register_static (G_TYPE_INTERFACE,
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"GstTuner", &gst_tuner_info, 0);
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g_type_interface_add_prerequisite (gst_tuner_type,
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GST_TYPE_IMPLEMENTS_INTERFACE);
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}
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return gst_tuner_type;
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}
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static void
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gst_tuner_class_init (GstTunerClass * klass)
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{
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static gboolean initialized = FALSE;
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if (!initialized) {
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/**
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* GstTuner::norm-changed:
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* @tuner: The element providing the GstTuner interface
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* @norm: The new configured norm.
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*
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* Reports that the current #GstTunerNorm has changed.
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*/
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gst_tuner_signals[NORM_CHANGED] =
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g_signal_new ("norm-changed",
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GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstTunerClass, norm_changed),
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NULL, NULL,
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g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_TUNER_NORM);
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/**
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* GstTuner::channel-changed:
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* @tuner: The element providing the GstTuner interface
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* @channel: The new configured channel.
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*
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* Reports that the current #GstTunerChannel has changed.
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*/
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gst_tuner_signals[CHANNEL_CHANGED] =
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g_signal_new ("channel-changed",
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GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstTunerClass, channel_changed),
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NULL, NULL,
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g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
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GST_TYPE_TUNER_CHANNEL);
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/**
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* GstTuner::frequency-changed:
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* @tuner: The element providing the GstTuner interface
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* @frequency: The new frequency (an unsigned long)
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*
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* Reports that the current frequency has changed.
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*/
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gst_tuner_signals[FREQUENCY_CHANGED] =
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g_signal_new ("frequency-changed",
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GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstTunerClass, frequency_changed),
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NULL, NULL,
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gst_interfaces_marshal_VOID__OBJECT_ULONG, G_TYPE_NONE, 2,
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GST_TYPE_TUNER_CHANNEL, G_TYPE_ULONG);
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/**
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* GstTuner::signal-changed:
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* @tuner: The element providing the GstTuner interface
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* @channel: The current #GstTunerChannel
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* @signal: The new signal strength (an integer)
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*
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* Reports that the signal strength has changed.
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*
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* See Also: gst_tuner_signal_strength()
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*/
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gst_tuner_signals[SIGNAL_CHANGED] =
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g_signal_new ("signal-changed",
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GST_TYPE_TUNER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstTunerClass, signal_changed),
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NULL, NULL,
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gst_interfaces_marshal_VOID__OBJECT_INT, G_TYPE_NONE, 2,
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GST_TYPE_TUNER_CHANNEL, G_TYPE_INT);
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initialized = TRUE;
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}
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/* default virtual functions */
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klass->list_channels = NULL;
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klass->set_channel = NULL;
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klass->get_channel = NULL;
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klass->list_norms = NULL;
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klass->set_norm = NULL;
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klass->get_norm = NULL;
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klass->set_frequency = NULL;
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klass->get_frequency = NULL;
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klass->signal_strength = NULL;
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}
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/**
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* gst_tuner_list_channels:
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* @tuner: the #GstTuner (a #GstElement) to get the channels from.
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*
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* Retrieve a #GList of #GstTunerChannels available
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* (e.g. 'composite', 's-video', ...) from the given tuner object.
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*
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* Returns: A list of channels available on this tuner. The list is
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* owned by the GstTuner and must not be freed.
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*/
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const GList *
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gst_tuner_list_channels (GstTuner * tuner)
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{
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GstTunerClass *klass;
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g_return_val_if_fail (GST_IS_TUNER (tuner), NULL);
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->list_channels) {
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return klass->list_channels (tuner);
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}
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return NULL;
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}
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/**
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* gst_tuner_set_channel:
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* @tuner: the #GstTuner (a #GstElement) that owns the channel.
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* @channel: the channel to tune to.
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*
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* Tunes the object to the given channel, which should be one of the
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* channels returned by gst_tuner_list_channels().
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*/
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void
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gst_tuner_set_channel (GstTuner * tuner, GstTunerChannel * channel)
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{
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GstTunerClass *klass;
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g_return_if_fail (GST_IS_TUNER (tuner));
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->set_channel) {
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klass->set_channel (tuner, channel);
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}
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}
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/**
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* gst_tuner_get_channel:
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* @tuner: the #GstTuner (a #GstElement) to get the current channel from.
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*
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* Retrieve the current channel from the tuner.
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*
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* Returns: the current channel of the tuner object.
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*/
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GstTunerChannel *
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gst_tuner_get_channel (GstTuner * tuner)
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{
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GstTunerClass *klass;
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g_return_val_if_fail (GST_IS_TUNER (tuner), NULL);
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->get_channel) {
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return klass->get_channel (tuner);
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}
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return NULL;
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}
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/**
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* gst_tuner_list_norms:
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* @tuner: the #GstTuner (*a #GstElement) to get the list of norms from.
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*
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* Retrieve a GList of available #GstTunerNorm settings for the currently
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* tuned channel on the given tuner object.
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*
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* Returns: A list of norms available on the current channel for this
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* tuner object. The list is owned by the GstTuner and must not
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* be freed.
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*/
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const GList *
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gst_tuner_list_norms (GstTuner * tuner)
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{
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GstTunerClass *klass;
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g_return_val_if_fail (GST_IS_TUNER (tuner), NULL);
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->list_norms) {
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return klass->list_norms (tuner);
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}
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return NULL;
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}
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/**
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* gst_tuner_set_norm:
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* @tuner: the #GstTuner (a #GstElement) to set the norm on.
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* @norm: the norm to use for the current channel.
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*
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* Changes the video norm on this tuner to the given norm, which should be
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* one of the norms returned by gst_tuner_list_norms().
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*/
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void
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gst_tuner_set_norm (GstTuner * tuner, GstTunerNorm * norm)
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{
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GstTunerClass *klass;
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g_return_if_fail (GST_IS_TUNER (tuner));
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->set_norm) {
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klass->set_norm (tuner, norm);
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}
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}
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/**
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* gst_tuner_get_norm:
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* @tuner: the #GstTuner (a #GstElement) to get the current norm from.
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*
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* Get the current video norm from the given tuner object for the
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* currently selected channel.
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*
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* Returns: the current norm.
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*/
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GstTunerNorm *
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gst_tuner_get_norm (GstTuner * tuner)
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{
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GstTunerClass *klass;
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g_return_val_if_fail (GST_IS_TUNER (tuner), NULL);
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->get_norm) {
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return klass->get_norm (tuner);
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}
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return NULL;
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}
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/**
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* gst_tuner_set_frequency:
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* @tuner: The #GstTuner (a #GstElement) that owns the given channel.
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* @channel: The #GstTunerChannel to set the frequency on.
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* @frequency: The frequency to tune in to.
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*
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* Sets a tuning frequency on the given tuner/channel. Note that this
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* requires the given channel to be a "tuning" channel, which can be
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* checked using GST_TUNER_CHANNEL_HAS_FLAG (), with the proper flag
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* being GST_TUNER_CHANNEL_FREQUENCY.
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*
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* The frequency is in Hz, with minimum steps indicated by the
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* frequency_multiplicator provided in the #GstTunerChannel. The
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* valid range is provided in the min_frequency and max_frequency properties
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* of the #GstTunerChannel.
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*/
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void
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gst_tuner_set_frequency (GstTuner * tuner,
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GstTunerChannel * channel, gulong frequency)
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{
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GstTunerClass *klass;
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g_return_if_fail (GST_IS_TUNER (tuner));
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g_return_if_fail (GST_IS_TUNER_CHANNEL (channel));
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g_return_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
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GST_TUNER_CHANNEL_FREQUENCY));
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->set_frequency) {
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klass->set_frequency (tuner, channel, frequency);
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}
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}
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/**
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* gst_tuner_get_frequency:
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* @tuner: The #GstTuner (a #GstElement) that owns the given channel.
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* @channel: The #GstTunerChannel to retrieve the frequency from.
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*
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* Retrieve the current frequency from the given channel. As for
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* gst_tuner_set_frequency(), the #GstTunerChannel must support frequency
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* operations, as indicated by the GST_TUNER_CHANNEL_FREQUENCY flag.
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*
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* Returns: The current frequency, or 0 on error.
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*/
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gulong
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gst_tuner_get_frequency (GstTuner * tuner, GstTunerChannel * channel)
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{
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GstTunerClass *klass;
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g_return_val_if_fail (GST_IS_TUNER (tuner), 0);
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g_return_val_if_fail (GST_IS_TUNER_CHANNEL (channel), 0);
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g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
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GST_TUNER_CHANNEL_FREQUENCY), 0);
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->get_frequency) {
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return klass->get_frequency (tuner, channel);
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}
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return 0;
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}
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/**
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* gst_tuner_signal_strength:
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* @tuner: the #GstTuner (a #GstElement) that owns the given channel.
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* @channel: the #GstTunerChannel to get the signal strength from.
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*
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* Get the strength of the signal on this channel. Note that this
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* requires the current channel to be a "tuning" channel, i.e. a
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* channel on which frequency can be set. This can be checked using
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* GST_TUNER_CHANNEL_HAS_FLAG (), and the appropriate flag to check
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* for is GST_TUNER_CHANNEL_FREQUENCY.
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*
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* The valid range of the signal strength is indicated in the
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* min_signal and max_signal properties of the #GstTunerChannel.
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*
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* Returns: Signal strength, or 0 on error.
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*/
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gint
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gst_tuner_signal_strength (GstTuner * tuner, GstTunerChannel * channel)
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{
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GstTunerClass *klass;
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g_return_val_if_fail (GST_IS_TUNER (tuner), 0);
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g_return_val_if_fail (GST_IS_TUNER_CHANNEL (channel), 0);
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g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
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GST_TUNER_CHANNEL_FREQUENCY), 0);
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klass = GST_TUNER_GET_CLASS (tuner);
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if (klass->signal_strength) {
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return klass->signal_strength (tuner, channel);
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}
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return 0;
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}
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/**
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* gst_tuner_find_norm_by_name:
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* @tuner: A #GstTuner instance
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* @norm: A string containing the name of a #GstTunerNorm
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*
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* Look up a #GstTunerNorm by name.
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*
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* Returns: A #GstTunerNorm, or NULL if no norm with the provided name
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* is available.
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*/
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GstTunerNorm *
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gst_tuner_find_norm_by_name (GstTuner * tuner, gchar * norm)
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{
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GList *walk;
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g_return_val_if_fail (GST_IS_TUNER (tuner), NULL);
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g_return_val_if_fail (norm != NULL, NULL);
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walk = (GList *) gst_tuner_list_norms (tuner);
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while (walk) {
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if (strcmp (GST_TUNER_NORM (walk->data)->label, norm) == 0)
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return GST_TUNER_NORM (walk->data);
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walk = g_list_next (walk);
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}
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return NULL;
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}
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/**
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* gst_tuner_find_channel_by_name:
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* @tuner: A #GstTuner instance
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* @channel: A string containing the name of a #GstTunerChannel
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*
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* Look up a #GstTunerChannel by name.
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*
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* Returns: A #GstTunerChannel, or NULL if no channel with the provided name
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* is available.
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*/
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GstTunerChannel *
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gst_tuner_find_channel_by_name (GstTuner * tuner, gchar * channel)
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{
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GList *walk;
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g_return_val_if_fail (GST_IS_TUNER (tuner), NULL);
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g_return_val_if_fail (channel != NULL, NULL);
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walk = (GList *) gst_tuner_list_channels (tuner);
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while (walk) {
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|
if (strcmp (GST_TUNER_CHANNEL (walk->data)->label, channel) == 0)
|
|
return GST_TUNER_CHANNEL (walk->data);
|
|
walk = g_list_next (walk);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_tuner_channel_changed:
|
|
* @tuner: A #GstTuner instance
|
|
* @channel: A #GstTunerChannel instance
|
|
*
|
|
* Called by elements implementing the #GstTuner interface when the
|
|
* current channel changes. Fires the #GstTuner::channel-changed signal.
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* gst_tuner_norm_changed:
|
|
* @tuner: A #GstTuner instance
|
|
* @norm: A #GstTunerNorm instance
|
|
*
|
|
* Called by elements implementing the #GstTuner interface when the
|
|
* current norm changes. Fires the #GstTuner::norm-changed signal.
|
|
*
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* gst_tuner_frequency_changed:
|
|
* @tuner: A #GstTuner instance
|
|
* @channel: The current #GstTunerChannel
|
|
* @frequency: The new frequency setting
|
|
*
|
|
* Called by elements implementing the #GstTuner interface when the
|
|
* configured frequency changes. Fires the #GstTuner::frequency-changed
|
|
* signal on the tuner, and the #GstTunerChannel::frequency-changed signal
|
|
* on the channel.
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* gst_tuner_signal_changed:
|
|
* @tuner: A #GstTuner instance
|
|
* @channel: The current #GstTunerChannel
|
|
* @signal: The new signal strength
|
|
*
|
|
* Called by elements implementing the #GstTuner interface when the
|
|
* incoming signal strength changes. Fires the #GstTuner::signal-changed
|
|
* signal on the tuner and the #GstTunerChannel::signal-changed signal on
|
|
* the channel.
|
|
*/
|
|
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);
|
|
}
|