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/* audio_remap.h
*
* Copyright (c) 2003-2012 HandBrake Team
* This file is part of the HandBrake source code
* Homepage: <http://handbrake.fr/>
* It may be used under the terms of the GNU General Public License v2.
* For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
/* This file handles the following two scenarios:
*
* 1) remapping from liba52/libdca order to libav order
* - this allows downmixing liba52/libdca sources with libavresample
*
* 2) remapping from libav order to aac/vorbis order
* - this allows encoding audio without libavcodec (faac, ca_aac, libvorbis)
*
* Thus we only need to support:
*
* a) channels found in liba52/libdca layouts
* b) channels found in HB_AMIXDOWN_* layouts
*
* Notes:
*
* Left/Right Surround -> Side Left/Right
* Left/Right Rear Surround -> Back Left/Right */
#ifndef AUDIO_REMAP_H
#define AUDIO_REMAP_H
#include <stdint.h>
// we only need to support the 11 "most common" channels
#define HB_AUDIO_REMAP_MAX_CHANNELS 11
typedef float hb_sample_t;
typedef struct
{
uint64_t channel_order[HB_AUDIO_REMAP_MAX_CHANNELS+1];
} hb_chan_map_t;
// used to convert between various channel orders
extern hb_chan_map_t hb_libav_chan_map;
extern hb_chan_map_t hb_liba52_chan_map;
extern hb_chan_map_t hb_libdca_chan_map;
extern hb_chan_map_t hb_vorbis_chan_map;
extern hb_chan_map_t hb_aac_chan_map;
int* hb_audio_remap_build_table(uint64_t layout, hb_chan_map_t *map_in, hb_chan_map_t *map_out);
void hb_audio_remap(int nchannels, int nsamples, hb_sample_t *samples, int *remap_table);
#endif /* AUDIO_REMAP_H */
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