/* ALSA mixer track implementation.

 * Copyright (C) 2003 Leif Johnson <leif@ambient.2y.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 <gst/gst-i18n-plugin.h>

#include "gstalsamixertrack.h"

static void gst_alsa_mixer_track_init (GstAlsaMixerTrack * alsa_track);

static void gst_alsa_mixer_track_class_init (gpointer g_class,

    gpointer class_data);

static GstMixerTrackClass *parent_class = NULL;

GType

gst_alsa_mixer_track_get_type (void)

{

  static GType track_type = 0;

  if (!track_type) {

    static const GTypeInfo track_info = {

      sizeof (GstAlsaMixerTrackClass),

      NULL,

      NULL,

      gst_alsa_mixer_track_class_init,

      NULL,

      NULL,

      sizeof (GstAlsaMixerTrack),

      0,

      (GInstanceInitFunc) gst_alsa_mixer_track_init,

      NULL

    };

    track_type =

        g_type_register_static (GST_TYPE_MIXER_TRACK, "GstAlsaMixerTrack",

        &track_info, 0);

  }

  return track_type;

}

static void

gst_alsa_mixer_track_class_init (gpointer g_class, gpointer class_data)

{

  parent_class = g_type_class_peek_parent (g_class);

}

static void

gst_alsa_mixer_track_init (GstAlsaMixerTrack * alsa_track)

{

}

static void

gst_alsa_mixer_track_update_alsa_capabilities (GstAlsaMixerTrack * alsa_track)

{

  alsa_track->alsa_flags = 0;

  alsa_track->capture_group = -1;

  if (snd_mixer_selem_has_common_volume (alsa_track->element))

    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_VOLUME;

  if (snd_mixer_selem_has_playback_volume (alsa_track->element))

    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_PVOLUME;

  if (snd_mixer_selem_has_capture_volume (alsa_track->element))

    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_CVOLUME;

  if (snd_mixer_selem_has_common_switch (alsa_track->element))

    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_SWITCH;

  if (snd_mixer_selem_has_playback_switch (alsa_track->element))

    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_PSWITCH;

  if (snd_mixer_selem_has_capture_switch (alsa_track->element)) {

    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_CSWITCH;

    if (snd_mixer_selem_has_capture_switch_exclusive (alsa_track->element)) {

      alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_CSWITCH_EXCL;

      alsa_track->capture_group =

          snd_mixer_selem_get_capture_group (alsa_track->element);

    }

  }

  GST_LOG ("[%s] alsa_flags=0x%08x, capture_group=%d",

      snd_mixer_selem_get_name (alsa_track->element),

      alsa_track->alsa_flags, alsa_track->capture_group);

}

inline static gboolean

alsa_track_has_cap (GstAlsaMixerTrack * alsa_track, guint32 flag)

{

  return ((alsa_track->alsa_flags & flag) != 0);

}

GstMixerTrack *

gst_alsa_mixer_track_new (snd_mixer_elem_t * element,

    gint num, gint track_num, gint flags, gboolean sw,

    GstAlsaMixerTrack * shared_mute_track, gboolean append_capture)

{

  GstAlsaMixerTrack *alsa_track;

  GstMixerTrack *track;

  const gchar *name;

  const gchar *label;

  gint i;

  long min = 0, max = 0;

  const struct

  {

    const gchar orig[12];

    const gchar trans[12];

  } alsa_track_labels[] = {

    {

    "Master", N_("Master")}, {

    "Bass", N_("Bass")}, {

    "Treble", N_("Treble")}, {

    "PCM", N_("PCM")}, {

    "Synth", N_("Synth")}, {

    "Line", N_("Line-in")}, {

    "CD", N_("CD")}, {

    "Mic", N_("Microphone")}, {

    "PC Speaker", N_("PC Speaker")}, {

    "Playback", N_("Playback")}, {

    "Capture", N_("Capture")}

  };

  name = snd_mixer_selem_get_name (element);

  GST_LOG ("[%s] num=%d,track_num=%d,flags=0x%08x,sw=%s,shared_mute_track=%p",

      name, num, track_num, flags, (sw) ? "true" : "false", shared_mute_track);

  track = (GstMixerTrack *) g_object_new (GST_ALSA_MIXER_TRACK_TYPE,

      "untranslated-label", name, NULL);

  alsa_track = (GstAlsaMixerTrack *) track;

  GST_LOG ("[%s] created new mixer track %p", name, track);

  /* This reflects the assumptions used for GstAlsaMixerTrack */

  if (!(!!(flags & GST_MIXER_TRACK_OUTPUT) ^ !!(flags & GST_MIXER_TRACK_INPUT))) {

    GST_ERROR ("Mixer track must be either output or input!");

    g_return_val_if_reached (NULL);

  }

  track->flags = flags;

  alsa_track->element = element;

  alsa_track->shared_mute = shared_mute_track;

  alsa_track->track_num = track_num;

  alsa_track->alsa_channels = 0;

  gst_alsa_mixer_track_update_alsa_capabilities (alsa_track);

  if (flags & GST_MIXER_TRACK_OUTPUT) {

    while (alsa_track->alsa_channels < GST_ALSA_MAX_CHANNELS &&

        snd_mixer_selem_has_playback_channel (element,

            alsa_track->alsa_channels)) {

      alsa_track->alsa_channels++;

    }

    GST_LOG ("[%s] %d output channels", name, alsa_track->alsa_channels);

  } else if (flags & GST_MIXER_TRACK_INPUT) {

    while (alsa_track->alsa_channels < GST_ALSA_MAX_CHANNELS &&

        snd_mixer_selem_has_capture_channel (element,

            alsa_track->alsa_channels)) {

      alsa_track->alsa_channels++;

    }

    GST_LOG ("[%s] %d input channels", name, alsa_track->alsa_channels);

  } else {

    g_assert_not_reached ();

  }

  if (sw)

    track->num_channels = 0;

  else

    track->num_channels = alsa_track->alsa_channels;

  /* translate the name if we can */

  label = name;

  for (i = 0; i < G_N_ELEMENTS (alsa_track_labels); ++i) {

    if (g_utf8_collate (label, alsa_track_labels[i].orig) == 0) {

      label = _(alsa_track_labels[i].trans);

      break;

    }

  }

  if (num == 0) {

    track->label = g_strdup_printf ("%s%s%s", label,

        append_capture ? " " : "", append_capture ? _("Capture") : "");

  } else {

    track->label = g_strdup_printf ("%s%s%s %d", label,

        append_capture ? " " : "", append_capture ? _("Capture") : "", num);

  }

  /* set volume information */

  if (track->num_channels > 0) {

    if ((flags & GST_MIXER_TRACK_OUTPUT))

      snd_mixer_selem_get_playback_volume_range (element, &min, &max);

    else

      snd_mixer_selem_get_capture_volume_range (element, &min, &max);

  }

  track->min_volume = (gint) min;

  track->max_volume = (gint) max;

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

    long tmp = 0;

    if (flags & GST_MIXER_TRACK_OUTPUT)

      snd_mixer_selem_get_playback_volume (element, i, &tmp);

    else

      snd_mixer_selem_get_capture_volume (element, i, &tmp);

    alsa_track->volumes[i] = (gint) tmp;

  }

  gst_alsa_mixer_track_update (alsa_track);

  return track;

}

void

gst_alsa_mixer_track_update (GstAlsaMixerTrack * alsa_track)

{

  GstMixerTrack *track = (GstMixerTrack *) alsa_track;

  gint i;

  gint audible = !(track->flags & GST_MIXER_TRACK_MUTE);

  if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_PVOLUME)) {

    /* update playback volume */

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

      long vol = 0;

      snd_mixer_selem_get_playback_volume (alsa_track->element, i, &vol);

      alsa_track->volumes[i] = (gint) vol;

    }

  }

  if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_CVOLUME)) {

    /* update capture volume */

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

      long vol = 0;

      snd_mixer_selem_get_capture_volume (alsa_track->element, i, &vol);

      alsa_track->volumes[i] = (gint) vol;

    }

  }

  /* Any updates in flags? */

  if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_PSWITCH)) {

    int v = 0;

    audible = 0;

    for (i = 0; i < alsa_track->alsa_channels; ++i) {

      snd_mixer_selem_get_playback_switch (alsa_track->element, i, &v);

      audible += v;

    }

  } else if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_PVOLUME) &&

      track->flags & GST_MIXER_TRACK_MUTE) {

    /* check if user has raised volume with a parallel running application */

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

      long vol = 0;

      snd_mixer_selem_get_playback_volume (alsa_track->element, i, &vol);

      if (vol > track->min_volume) {

        audible = 1;

        break;

      }

    }

  }

  if (!!(audible) != !(track->flags & GST_MIXER_TRACK_MUTE)) {

    if (audible) {

      track->flags &= ~GST_MIXER_TRACK_MUTE;

      if (alsa_track->shared_mute)

        ((GstMixerTrack *) (alsa_track->shared_mute))->flags &=

            ~GST_MIXER_TRACK_MUTE;

    } else {

      track->flags |= GST_MIXER_TRACK_MUTE;

      if (alsa_track->shared_mute)

        ((GstMixerTrack *) (alsa_track->shared_mute))->flags |=

            GST_MIXER_TRACK_MUTE;

    }

  }

  if (track->flags & GST_MIXER_TRACK_INPUT) {

    gint recording = track->flags & GST_MIXER_TRACK_RECORD;

    if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_CSWITCH)) {

      int v = 0;

      recording = 0;

      for (i = 0; i < alsa_track->alsa_channels; ++i) {

        snd_mixer_selem_get_capture_switch (alsa_track->element, i, &v);

        recording += v;

      }

    } else if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_CVOLUME) &&

        !(track->flags & GST_MIXER_TRACK_RECORD)) {

      /* check if user has raised volume with a parallel running application */

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

        long vol = 0;

        snd_mixer_selem_get_capture_volume (alsa_track->element, i, &vol);

        if (vol > track->min_volume) {

          recording = 1;

          break;

        }

      }

    }

    if (recording)

      track->flags |= GST_MIXER_TRACK_RECORD;

    else

      track->flags &= ~GST_MIXER_TRACK_RECORD;

  }

}