/* GStreamer Mixer

 * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>

 *

 * mixer.c: mixer 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 "mixer.h"

#include "interfaces-marshal.h"

#define GST_MIXER_MESSAGE_NAME "gst-mixer-message"

/**

 * SECTION:gstmixer

 * @short_description: Interface for elements that provide mixer operations

 */

#ifndef GST_DISABLE_DEPRECATED

enum

{

  SIGNAL_MUTE_TOGGLED,

  SIGNAL_RECORD_TOGGLED,

  SIGNAL_VOLUME_CHANGED,

  SIGNAL_OPTION_CHANGED,

  LAST_SIGNAL

};

static guint gst_mixer_signals[LAST_SIGNAL] = { 0 };

#endif

static void gst_mixer_class_init (GstMixerClass * klass);

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GType

gst_mixer_get_type (void)

{

  static GType gst_mixer_type = 0;

  if (!gst_mixer_type) {

    static const GTypeInfo gst_mixer_info = {

      sizeof (GstMixerClass),

      (GBaseInitFunc) gst_mixer_class_init,

      NULL,

      NULL,

      NULL,

      NULL,

      0,

      0,

      NULL,

    };

    gst_mixer_type = g_type_register_static (G_TYPE_INTERFACE,

        "GstMixer", &gst_mixer_info, 0);

    g_type_interface_add_prerequisite (gst_mixer_type,

        GST_TYPE_IMPLEMENTS_INTERFACE);

  }

  return gst_mixer_type;

}

static void

gst_mixer_class_init (GstMixerClass * klass)

{

#ifndef GST_DISABLE_DEPRECATED

  static gboolean initialized = FALSE;

  /* signals (deprecated) */

  if (!initialized) {

    gst_mixer_signals[SIGNAL_RECORD_TOGGLED] =

        g_signal_new ("record-toggled",

        GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,

        G_STRUCT_OFFSET (GstMixerClass, record_toggled),

        NULL, NULL,

        gst_interfaces_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2,

        GST_TYPE_MIXER_TRACK, G_TYPE_BOOLEAN);

    gst_mixer_signals[SIGNAL_MUTE_TOGGLED] =

        g_signal_new ("mute-toggled",

        GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,

        G_STRUCT_OFFSET (GstMixerClass, mute_toggled),

        NULL, NULL,

        gst_interfaces_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2,

        GST_TYPE_MIXER_TRACK, G_TYPE_BOOLEAN);

    gst_mixer_signals[SIGNAL_VOLUME_CHANGED] =

        g_signal_new ("volume-changed",

        GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,

        G_STRUCT_OFFSET (GstMixerClass, volume_changed),

        NULL, NULL,

        gst_interfaces_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 2,

        GST_TYPE_MIXER_TRACK, G_TYPE_POINTER);

    gst_mixer_signals[SIGNAL_OPTION_CHANGED] =

        g_signal_new ("option-changed",

        GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,

        G_STRUCT_OFFSET (GstMixerClass, option_changed),

        NULL, NULL,

        gst_interfaces_marshal_VOID__OBJECT_STRING, G_TYPE_NONE, 2,

        GST_TYPE_MIXER_OPTIONS, G_TYPE_STRING);

    initialized = TRUE;

  }

#endif

  klass->mixer_type = GST_MIXER_SOFTWARE;

  /* default virtual functions */

  klass->list_tracks = NULL;

  klass->set_volume = NULL;

  klass->get_volume = NULL;

  klass->set_mute = NULL;

  klass->set_record = NULL;

  klass->set_option = NULL;

  klass->get_option = NULL;

}

/**

 * gst_mixer_list_tracks:

 * @mixer: the #GstMixer (a #GstElement) to get the tracks from.

 *

 * Returns a list of available tracks for this mixer/element. Note

 * that it is allowed for sink (output) elements to only provide

 * the output tracks in this list. Likewise, for sources (inputs),

 * it is allowed to only provide input elements in this list.

 *

 * Returns: A #GList consisting of zero or more #GstMixerTracks.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

const GList *

gst_mixer_list_tracks (GstMixer * mixer)

{

  GstMixerClass *klass;

  g_return_val_if_fail (mixer != NULL, NULL);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->list_tracks) {

    return klass->list_tracks (mixer);

  }

  return NULL;

}

/**

 * gst_mixer_set_volume:

 * @mixer: The #GstMixer (a #GstElement) that owns the track.

 * @track: The #GstMixerTrack to set the volume on.

 * @volumes: an array of integers (of size track->num_channels)

 *           that gives the wanted volume for each channel in

 *           this track.

 *

 * Sets the volume on each channel in a track. Short note about

 * naming: a track is defined as one separate stream owned by

 * the mixer/element, such as 'Line-in' or 'Microphone'. A

 * channel is said to be a mono-stream inside this track. A

 * stereo track thus contains two channels.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_set_volume (GstMixer * mixer, GstMixerTrack * track, gint * volumes)

{

  GstMixerClass *klass;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (track != NULL);

  g_return_if_fail (volumes != NULL);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_volume) {

    klass->set_volume (mixer, track, volumes);

  }

}

/**

 * gst_mixer_get_volume:

 * @mixer: the #GstMixer (a #GstElement) that owns the track

 * @track: the GstMixerTrack to get the volume from.

 * @volumes: a pre-allocated array of integers (of size

 *           track->num_channels) to store the current volume

 *           of each channel in the given track in.

 *

 * Get the current volume(s) on the given track.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_get_volume (GstMixer * mixer, GstMixerTrack * track, gint * volumes)

{

  GstMixerClass *klass;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (track != NULL);

  g_return_if_fail (volumes != NULL);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->get_volume) {

    klass->get_volume (mixer, track, volumes);

  } else {

    gint i;

    for (i = 0; i < track->num_channels; i++) {

      volumes[i] = 0;

    }

  }

}

/**

 * gst_mixer_set_mute:

 * @mixer: the #GstMixer (a #GstElement) that owns the track.

 * @track: the #GstMixerTrack to operate on.

 * @mute: a boolean value indicating whether to turn on or off

 *        muting.

 *

 * Mutes or unmutes the given channel. To find out whether a

 * track is currently muted, use GST_MIXER_TRACK_HAS_FLAG ().

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_set_mute (GstMixer * mixer, GstMixerTrack * track, gboolean mute)

{

  GstMixerClass *klass;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (track != NULL);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_mute) {

    klass->set_mute (mixer, track, mute);

  }

}

/**

 * gst_mixer_set_record:

 * @mixer: The #GstMixer (a #GstElement) that owns the track.

 * @track: the #GstMixerTrack to operate on.

 * @record: a boolean value that indicates whether to turn on

 *          or off recording.

 *

 * Enables or disables recording on the given track. Note that

 * this is only possible on input tracks, not on output tracks

 * (see GST_MIXER_TRACK_HAS_FLAG () and the GST_MIXER_TRACK_INPUT

 * flag).

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_set_record (GstMixer * mixer, GstMixerTrack * track, gboolean record)

{

  GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_record) {

    klass->set_record (mixer, track, record);

  }

}

/**

 * gst_mixer_set_option:

 * @mixer: The #GstMixer (a #GstElement) that owns the optionlist.

 * @opts: The #GstMixerOptions that we operate on.

 * @value: The requested new option value.

 *

 * Sets a name/value option in the mixer to the requested value.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_set_option (GstMixer * mixer, GstMixerOptions * opts, gchar * value)

{

  GstMixerClass *klass;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (opts != NULL);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_option) {

    klass->set_option (mixer, opts, value);

  }

}

/**

 * gst_mixer_get_option:

 * @mixer: The #GstMixer (a #GstElement) that owns the optionlist.

 * @opts: The #GstMixerOptions that we operate on.

 *

 * Get the current value of a name/value option in the mixer.

 *

 * Returns: current value of the name/value option.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

const gchar *

gst_mixer_get_option (GstMixer * mixer, GstMixerOptions * opts)

{

  GstMixerClass *klass;

  g_return_val_if_fail (mixer != NULL, NULL);

  g_return_val_if_fail (opts != NULL, NULL);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->get_option) {

    return klass->get_option (mixer, opts);

  }

  return NULL;

}

/**

 * gst_mixer_get_mixer_flags:

 * @mixer: The #GstMixer implementation

 *

 * Get the set of supported flags for this mixer implementation.

 *

 * Returns: A set of or-ed GstMixerFlags for supported features.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GstMixerFlags

gst_mixer_get_mixer_flags (GstMixer * mixer)

{

  GstMixerClass *klass;

  g_return_val_if_fail (mixer != NULL, FALSE);

  klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->get_mixer_flags) {

    return klass->get_mixer_flags (mixer);

  }

  return GST_MIXER_FLAG_NONE;

}

/**

 * gst_mixer_mute_toggled:

 * @mixer: the #GstMixer (a #GstElement) that owns the track

 * @track: the GstMixerTrack that has change mute state.

 * @mute: the new state of the mute flag on the track

 *

 * This function is called by the mixer implementation to produce

 * a notification message on the bus indicating that the given track

 * has changed mute state.

 *

 * This function only works for GstElements that are implementing the

 * GstMixer interface, and the element needs to have been provided a bus.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_mute_toggled (GstMixer * mixer, GstMixerTrack * track, gboolean mute)

{

  GstStructure *s;

  GstMessage *m;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (GST_IS_ELEMENT (mixer));

  g_return_if_fail (track != NULL);

  s = gst_structure_new (GST_MIXER_MESSAGE_NAME,

      "type", G_TYPE_STRING, "mute-toggled",

      "track", GST_TYPE_MIXER_TRACK, track, "mute", G_TYPE_BOOLEAN, mute, NULL);

  m = gst_message_new_element (GST_OBJECT (mixer), s);

  if (gst_element_post_message (GST_ELEMENT (mixer), m) == FALSE) {

    GST_WARNING ("This element has no bus, therefore no message sent!");

  }

}

/**

 * gst_mixer_record_toggled:

 * @mixer: the #GstMixer (a #GstElement) that owns the track

 * @track: the GstMixerTrack that has changed recording state.

 * @record: the new state of the record flag on the track

 *

 * This function is called by the mixer implementation to produce

 * a notification message on the bus indicating that the given track

 * has changed recording state.

 *

 * This function only works for GstElements that are implementing the

 * GstMixer interface, and the element needs to have been provided a bus.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_record_toggled (GstMixer * mixer,

    GstMixerTrack * track, gboolean record)

{

  GstStructure *s;

  GstMessage *m;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (GST_IS_ELEMENT (mixer));

  g_return_if_fail (track != NULL);

  s = gst_structure_new (GST_MIXER_MESSAGE_NAME,

      "type", G_TYPE_STRING, "record-toggled",

      "track", GST_TYPE_MIXER_TRACK, track,

      "record", G_TYPE_BOOLEAN, record, NULL);

  m = gst_message_new_element (GST_OBJECT (mixer), s);

  if (gst_element_post_message (GST_ELEMENT (mixer), m) == FALSE) {

    GST_WARNING ("This element has no bus, therefore no message sent!");

  }

}

/**

 * gst_mixer_volume_changed:

 * @mixer: the #GstMixer (a #GstElement) that owns the track

 * @track: the GstMixerTrack that has changed.

 * @volumes: Array of volume values, one per channel on the mixer track.

 *

 * This function is called by the mixer implementation to produce

 * a notification message on the bus indicating that the volume(s) for the

 * given track have changed.

 *

 * This function only works for GstElements that are implementing the

 * GstMixer interface, and the element needs to have been provided a bus.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_mixer_volume_changed (GstMixer * mixer,

    GstMixerTrack * track, gint * volumes)

{

  GstStructure *s;

  GstMessage *m;

  GValue l = { 0, };

  GValue v = { 0, };

  gint i;

  g_return_if_fail (mixer != NULL);

  g_return_if_fail (GST_IS_ELEMENT (mixer));

  g_return_if_fail (track != NULL);

  s = gst_structure_new (GST_MIXER_MESSAGE_NAME,

      "type", G_TYPE_STRING, "volume-changed",

      "track", GST_TYPE_MIXER_TRACK, track, NULL);

  g_value_init (&l, GST_TYPE_ARRAY);

  g_value_init (&v, G_TYPE_INT);

  /* FIXME 0.11: pass track->num_channels to the function */

  for (i = 0; i < track->num_channels; ++i) {

    g_value_set_int (&v, volumes[i]);

    gst_value_array_append_value (&l, &v);

  }

  g_value_unset (&v);