/* GStreamer Multichannel-Audio helper functions

 * (c) 2004 Ronald Bultje <rbultje@ronald.bitfreak.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.

 */

#ifndef __GST_AUDIO_MULTICHANNEL_H__

#define __GST_AUDIO_MULTICHANNEL_H__

#include <gst/audio/audio.h>

G_BEGIN_DECLS

typedef enum {

  GST_AUDIO_CHANNEL_POSITION_INVALID = -1,

  /* Main front speakers. Mono and left/right are mututally exclusive! */

  GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,

  GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,

  GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,

  /* rear. Left/right and center are mututally exclusive! */

  GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,

  GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,

  GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,

  /* subwoofer/low-frequency */

  GST_AUDIO_CHANNEL_POSITION_LFE,

  /* Center front speakers. Center and left/right_of_center cannot be

   * used together! */

  GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,

  GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,

  GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,

  /* sides */

  GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,

  GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,

  /* for multi-channel input and output with more than 8 channels,

   * incompatible with all other positions, either all positions

   * are defined or all positions are undefined, but can't mix'n'match  */

  GST_AUDIO_CHANNEL_POSITION_NONE,

  /* don't use - counter */

  GST_AUDIO_CHANNEL_POSITION_NUM

} GstAudioChannelPosition;

/* Retrieves or sets the positions from/to a GstStructure. Only

 * works with fixed caps, caller should check for that! Caller

 * g_free()s result of the getter. */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstAudioChannelPosition *

        gst_audio_get_channel_positions (GstStructure *str);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void    gst_audio_set_channel_positions (GstStructure *str,

                                         const GstAudioChannelPosition *pos);

/* Sets a (non-fixed) list of possible audio channel positions

 * on a structure (this requires the "channels" property to

 * be fixed!) or on a caps (here, the "channels" property may be

 * unfixed and the caps may even contain multiple structures). */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void    gst_audio_set_structure_channel_positions_list

                                        (GstStructure *str,

                                         const GstAudioChannelPosition *pos,

                                         gint          num_positions);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void    gst_audio_set_caps_channel_positions_list

                                        (GstCaps      *caps,

                                         const GstAudioChannelPosition *pos,

                                         gint          num_positions);

/* Custom fixate function. Elements that implement some sort of

 * channel conversion algorhithm should use this function for

 * fixating on GstAudioChannelPosition properties. It will take

 * care of equal channel positioning (left/right). Caller g_free()s

 * the return value. The input properties may be (and are supposed

 * to be) unfixed. */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstAudioChannelPosition *

        gst_audio_fixate_channel_positions (GstStructure *str);

G_END_DECLS

#endif /* __GST_AUDIO_MULTICHANNEL_H__ */