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119 lines
4.8 KiB
C
119 lines
4.8 KiB
C
/* GStreamer Multichannel-Audio helper functions
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* (c) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
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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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#ifndef __GST_AUDIO_MULTICHANNEL_H__
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#define __GST_AUDIO_MULTICHANNEL_H__
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#include <gst/audio/audio.h>
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#include <gst/audio/audio-enumtypes.h>
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G_BEGIN_DECLS
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/**
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* GstAudioChannelPosition:
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_MONO: front mono
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT: front left
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT: front right
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* @GST_AUDIO_CHANNEL_POSITION_REAR_CENTER: rear center
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* @GST_AUDIO_CHANNEL_POSITION_REAR_LEFT: rear left
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* @GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT: rear right
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* @GST_AUDIO_CHANNEL_POSITION_LFE: subwoofer
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER: front center
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER: front left of center
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER: front right of center
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* @GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT: side left
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* @GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT: side right
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* @GST_AUDIO_CHANNEL_POSITION_NONE: used for position-less channels, e.g.
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* from a sound card that records 1024 channels; mutually exclusive with
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* any other channel position
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* @GST_AUDIO_CHANNEL_POSITION_INVALID: invalid position
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*
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* Audio channel positions.
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*/
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typedef enum {
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GST_AUDIO_CHANNEL_POSITION_INVALID = -1,
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/* Main front speakers. Mono and left/right are mututally exclusive! */
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GST_AUDIO_CHANNEL_POSITION_FRONT_MONO,
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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/* rear. Left/right and center are mututally exclusive! */
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GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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/* subwoofer/low-frequency */
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GST_AUDIO_CHANNEL_POSITION_LFE,
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/* Center front speakers. Center and left/right_of_center cannot be
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* used together! */
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
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/* sides */
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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/* for multi-channel input and output with more than 8 channels,
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* incompatible with all other positions, either all positions
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* are defined or all positions are undefined, but can't mix'n'match */
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GST_AUDIO_CHANNEL_POSITION_NONE,
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/*< private >*/
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/* don't use - counter */
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GST_AUDIO_CHANNEL_POSITION_NUM
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} GstAudioChannelPosition;
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/* Retrieves or sets the positions from/to a GstStructure. Only
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* works with fixed caps, caller should check for that! Caller
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* g_free()s result of the getter. */
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GstAudioChannelPosition *
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gst_audio_get_channel_positions (GstStructure *str);
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void gst_audio_set_channel_positions (GstStructure *str,
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const GstAudioChannelPosition *pos);
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/* Sets a (non-fixed) list of possible audio channel positions
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* on a structure (this requires the "channels" property to
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* be fixed!) or on a caps (here, the "channels" property may be
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* unfixed and the caps may even contain multiple structures). */
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void gst_audio_set_structure_channel_positions_list
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(GstStructure *str,
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const GstAudioChannelPosition *pos,
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gint num_positions);
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void gst_audio_set_caps_channel_positions_list
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(GstCaps *caps,
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const GstAudioChannelPosition *pos,
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gint num_positions);
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/* Custom fixate function. Elements that implement some sort of
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* channel conversion algorhithm should use this function for
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* fixating on GstAudioChannelPosition properties. It will take
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* care of equal channel positioning (left/right). Caller g_free()s
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* the return value. The input properties may be (and are supposed
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* to be) unfixed. */
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GstAudioChannelPosition *
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gst_audio_fixate_channel_positions (GstStructure *str);
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gboolean gst_audio_check_channel_positions (const GstAudioChannelPosition * pos, guint channels);
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G_END_DECLS
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#endif /* __GST_AUDIO_MULTICHANNEL_H__ */
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