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Diffstat (limited to 'gst-libs/gst/audio/multichannel.h')
| -rw-r--r-- | gst-libs/gst/audio/multichannel.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/gst-libs/gst/audio/multichannel.h b/gst-libs/gst/audio/multichannel.h new file mode 100644 index 00000000..5194fffa --- /dev/null +++ b/gst-libs/gst/audio/multichannel.h @@ -0,0 +1,86 @@ +/* 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> +#include <gst/audio/multichannel-enumtypes.h> + +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, + + /* 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. */ +GstAudioChannelPosition * + gst_audio_get_channel_positions (GstStructure *str); +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). */ +void gst_audio_set_structure_channel_positions_list + (GstStructure *str, + const GstAudioChannelPosition *pos, + gint num_positions); +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. */ +GstAudioChannelPosition * + gst_audio_fixate_channel_positions (GstStructure *str); + +#endif /* __GST_AUDIO_MULTICHANNEL_H__ */ |