mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-30 03:12:08 +00:00
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* audio conversion routines
|
|
*/
|
|
|
|
#include "libavutil/avutil.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "audioconvert.h"
|
|
|
|
static const char * const channel_names[] = {
|
|
"FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC",
|
|
"BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL",
|
|
"TBC", "TBR",
|
|
[29] = "DL",
|
|
[30] = "DR",
|
|
};
|
|
|
|
static const char *get_channel_name(int channel_id)
|
|
{
|
|
if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
|
|
return NULL;
|
|
return channel_names[channel_id];
|
|
}
|
|
|
|
static const struct {
|
|
const char *name;
|
|
int nb_channels;
|
|
int64_t layout;
|
|
} channel_layout_map[] = {
|
|
{ "mono", 1, AV_CH_LAYOUT_MONO },
|
|
{ "stereo", 2, AV_CH_LAYOUT_STEREO },
|
|
{ "4.0", 4, AV_CH_LAYOUT_4POINT0 },
|
|
{ "quad", 4, AV_CH_LAYOUT_QUAD },
|
|
{ "5.0", 5, AV_CH_LAYOUT_5POINT0 },
|
|
{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
|
|
{ "5.1", 6, AV_CH_LAYOUT_5POINT1 },
|
|
{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
|
|
{ "5.1+downmix", 8, AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
|
|
{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },
|
|
{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
|
|
{ "7.1+downmix", 10, AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
|
|
{ 0 }
|
|
};
|
|
|
|
int64_t av_get_channel_layout(const char *name)
|
|
{
|
|
int i = 0;
|
|
do {
|
|
if (!strcmp(channel_layout_map[i].name, name))
|
|
return channel_layout_map[i].layout;
|
|
i++;
|
|
} while (channel_layout_map[i].name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void av_get_channel_layout_string(char *buf, int buf_size,
|
|
int nb_channels, int64_t channel_layout)
|
|
{
|
|
int i;
|
|
|
|
if (nb_channels <= 0)
|
|
nb_channels = av_get_channel_layout_nb_channels(channel_layout);
|
|
|
|
for (i = 0; channel_layout_map[i].name; i++)
|
|
if (nb_channels == channel_layout_map[i].nb_channels &&
|
|
channel_layout == channel_layout_map[i].layout) {
|
|
av_strlcpy(buf, channel_layout_map[i].name, buf_size);
|
|
return;
|
|
}
|
|
|
|
snprintf(buf, buf_size, "%d channels", nb_channels);
|
|
if (channel_layout) {
|
|
int i,ch;
|
|
av_strlcat(buf, " (", buf_size);
|
|
for(i=0,ch=0; i<64; i++) {
|
|
if ((channel_layout & (1L<<i))) {
|
|
const char *name = get_channel_name(i);
|
|
if (name) {
|
|
if (ch>0) av_strlcat(buf, "|", buf_size);
|
|
av_strlcat(buf, name, buf_size);
|
|
}
|
|
ch++;
|
|
}
|
|
}
|
|
av_strlcat(buf, ")", buf_size);
|
|
}
|
|
}
|
|
|
|
int av_get_channel_layout_nb_channels(int64_t channel_layout)
|
|
{
|
|
int count;
|
|
uint64_t x = channel_layout;
|
|
for (count = 0; x; count++)
|
|
x &= x-1; // unset lowest set bit
|
|
return count;
|
|
}
|