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/* audio_remap.c
*
* 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
*/
#include "common.h"
#include "hbffmpeg.h"
#include "audio_remap.h"
// source: libavutil/audioconvert.h
hb_chan_map_t hb_libav_chan_map =
{
{
AV_CH_FRONT_LEFT,
AV_CH_FRONT_RIGHT,
AV_CH_FRONT_CENTER,
AV_CH_LOW_FREQUENCY,
AV_CH_BACK_LEFT,
AV_CH_BACK_RIGHT,
AV_CH_FRONT_LEFT_OF_CENTER,
AV_CH_FRONT_RIGHT_OF_CENTER,
AV_CH_BACK_CENTER,
AV_CH_SIDE_LEFT,
AV_CH_SIDE_RIGHT,
0
}
};
// source: liba52 documentation
hb_chan_map_t hb_liba52_chan_map =
{
{
AV_CH_LOW_FREQUENCY,
AV_CH_FRONT_LEFT,
AV_CH_FRONT_CENTER,
AV_CH_FRONT_RIGHT,
AV_CH_BACK_CENTER,
AV_CH_SIDE_LEFT,
AV_CH_SIDE_RIGHT,
0
}
};
// source: http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9
hb_chan_map_t hb_vorbis_chan_map =
{
{
AV_CH_FRONT_LEFT,
AV_CH_FRONT_CENTER,
AV_CH_FRONT_RIGHT,
AV_CH_SIDE_LEFT,
AV_CH_SIDE_RIGHT,
AV_CH_BACK_LEFT,
AV_CH_BACK_CENTER,
AV_CH_BACK_RIGHT,
AV_CH_LOW_FREQUENCY,
0
}
};
// source: https://developer.apple.com/library/mac/#documentation/musicaudio/reference/CoreAudioDataTypesRef/Reference/reference.html
hb_chan_map_t hb_aac_chan_map =
{
{
AV_CH_FRONT_CENTER,
AV_CH_FRONT_LEFT_OF_CENTER,
AV_CH_FRONT_RIGHT_OF_CENTER,
AV_CH_FRONT_LEFT,
AV_CH_FRONT_RIGHT,
AV_CH_SIDE_LEFT,
AV_CH_SIDE_RIGHT,
AV_CH_BACK_LEFT,
AV_CH_BACK_RIGHT,
AV_CH_BACK_CENTER,
AV_CH_LOW_FREQUENCY,
0
}
};
hb_audio_remap_t* hb_audio_remap_init(uint64_t channel_layout,
hb_chan_map_t *map_out,
hb_chan_map_t *map_in)
{
hb_audio_remap_t *remap = malloc(sizeof(hb_audio_remap_t));
if (remap == NULL)
return NULL;
remap->remap_table = hb_audio_remap_build_table(channel_layout,
map_out, map_in);
if (remap->remap_table == NULL)
{
hb_audio_remap_free(remap);
return NULL;
}
int ii;
remap->nchannels = av_get_channel_layout_nb_channels(channel_layout);
remap->sample_size = remap->nchannels * sizeof(hb_sample_t);
remap->remap_needed = 0;
for (ii = 0; ii < remap->nchannels; ii++)
{
if (remap->remap_table[ii] != ii)
{
remap->remap_needed = 1;
break;
}
}
return remap;
}
void hb_audio_remap_free(hb_audio_remap_t *remap)
{
if (remap != NULL)
{
if (remap->remap_table != NULL)
{
free(remap->remap_table);
}
free(remap);
}
}
void hb_audio_remap(hb_audio_remap_t *remap, hb_sample_t *samples, int nsamples)
{
if (remap != NULL && remap->remap_needed)
{
int ii, jj;
for (ii = 0; ii < nsamples; ii++)
{
memcpy(remap->tmp, samples, remap->sample_size);
for (jj = 0; jj < remap->nchannels; jj++)
{
samples[jj] = remap->tmp[remap->remap_table[jj]];
}
samples += remap->nchannels;
}
}
}
int* hb_audio_remap_build_table(uint64_t channel_layout,
hb_chan_map_t *map_out,
hb_chan_map_t *map_in)
{
int ii, jj, nchannels, out_chan_idx, remap_idx, *remap_table;
uint64_t *channels_in, *channels_out;
if (channel_layout == AV_CH_LAYOUT_STEREO_DOWNMIX)
{
// Dolby Surround is Stereo when it comes to remapping
channel_layout = AV_CH_LAYOUT_STEREO;
}
nchannels = av_get_channel_layout_nb_channels(channel_layout);
remap_table = malloc(nchannels * sizeof(int));
if (remap_table == NULL)
return NULL;
out_chan_idx = 0;
channels_in = map_in->channel_order_map;
channels_out = map_out->channel_order_map;
for (ii = 0; channels_out[ii] && out_chan_idx < nchannels; ii++)
{
if (channel_layout & channels_out[ii])
{
remap_idx = 0;
for (jj = 0; channels_in[jj]; jj++)
{
if (channels_out[ii] == channels_in[jj])
{
remap_table[out_chan_idx++] = remap_idx++;
break;
}
else if (channel_layout & channels_in[jj])
{
remap_idx++;
}
}
}
}
return remap_table;
}
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