📄 downmix.c
字号:
/*
* downmix.c
* Copyright (C) 2004 Gildas Bazin <gbazin@videolan.org>
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of dtsdec, a free DTS Coherent Acoustics stream decoder.
* See http://www.videolan.org/dtsdec.html for updates.
*
* dtsdec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* dtsdec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <string.h>
#include <inttypes.h>
#include "dts.h"
#include "dts_internal.h"
#define CONVERT(acmod,output) (((output) << DTS_CHANNEL_BITS) + (acmod))
int dts_downmix_init (int input, int flags, level_t * level,
level_t clev, level_t slev)
{
static uint8_t table[11][10] = {
/* DTS_MONO */
{DTS_MONO, DTS_MONO, DTS_MONO, DTS_MONO,
DTS_MONO, DTS_MONO, DTS_MONO, DTS_MONO,
DTS_MONO, DTS_MONO},
/* DTS_CHANNEL */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO},
/* DTS_STEREO */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO},
/* DTS_STEREO_SUMDIFF */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO},
/* DTS_STEREO_TOTAL */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO},
/* DTS_3F */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_3F, DTS_3F, DTS_3F,
DTS_3F, DTS_3F},
/* DTS_2F1R */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_2F1R, DTS_2F1R, DTS_2F1R,
DTS_2F1R, DTS_2F1R},
/* DTS_3F1R */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_3F, DTS_3F1R, DTS_3F1R,
DTS_3F1R, DTS_3F1R},
/* DTS_2F2R */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_STEREO, DTS_2F2R, DTS_2F2R,
DTS_2F2R, DTS_2F2R},
/* DTS_3F2R */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_3F, DTS_3F2R, DTS_3F2R,
DTS_3F2R, DTS_3F2R},
/* DTS_4F2R */
{DTS_MONO, DTS_CHANNEL, DTS_STEREO, DTS_STEREO,
DTS_STEREO, DTS_4F2R, DTS_4F2R, DTS_4F2R,
DTS_4F2R, DTS_4F2R},
};
int output;
output = flags & DTS_CHANNEL_MASK;
if (output > DTS_CHANNEL_MAX)
return -1;
output = table[output][input];
if (output == DTS_STEREO &&
(input == DTS_DOLBY || (input == DTS_3F && clev == LEVEL (LEVEL_3DB))))
output = DTS_DOLBY;
if (flags & DTS_ADJUST_LEVEL) {
level_t adjust;
switch (CONVERT (input & 7, output)) {
case CONVERT (DTS_3F, DTS_MONO):
adjust = (sample_t)(DIV (LEVEL_3DB, LEVEL (1) + clev));
break;
case CONVERT (DTS_STEREO, DTS_MONO):
case CONVERT (DTS_2F2R, DTS_2F1R):
case CONVERT (DTS_3F2R, DTS_3F1R):
level_3db:
adjust = (sample_t)(LEVEL (LEVEL_3DB));
break;
case CONVERT (DTS_3F2R, DTS_2F1R):
if (clev < LEVEL (LEVEL_PLUS3DB - 1))
goto level_3db;
/* break thru */
case CONVERT (DTS_3F, DTS_STEREO):
case CONVERT (DTS_3F1R, DTS_2F1R):
case CONVERT (DTS_3F1R, DTS_2F2R):
case CONVERT (DTS_3F2R, DTS_2F2R):
adjust = DIV (1, LEVEL (1) + clev);
break;
case CONVERT (DTS_2F1R, DTS_MONO):
adjust = (sample_t)(DIV (LEVEL_PLUS3DB, LEVEL (2) + slev));
break;
case CONVERT (DTS_2F1R, DTS_STEREO):
case CONVERT (DTS_3F1R, DTS_3F):
adjust = (sample_t)(DIV (1, LEVEL (1) + MUL_C (slev, LEVEL_3DB)));
break;
case CONVERT (DTS_3F1R, DTS_MONO):
adjust = (sample_t)(DIV (LEVEL_3DB, LEVEL (1) + clev + MUL_C (slev, 0.5)));
break;
case CONVERT (DTS_3F1R, DTS_STEREO):
adjust = (sample_t)(DIV (1, LEVEL (1) + clev + MUL_C (slev, LEVEL_3DB)));
break;
case CONVERT (DTS_2F2R, DTS_MONO):
adjust = (sample_t)(DIV (LEVEL_3DB, LEVEL (1) + slev));
break;
case CONVERT (DTS_2F2R, DTS_STEREO):
case CONVERT (DTS_3F2R, DTS_3F):
adjust = DIV (1, LEVEL (1) + slev);
break;
case CONVERT (DTS_3F2R, DTS_MONO):
adjust = (sample_t)(DIV (LEVEL_3DB, LEVEL (1) + clev + slev));
break;
case CONVERT (DTS_3F2R, DTS_STEREO):
adjust = DIV (1, LEVEL (1) + clev + slev);
break;
case CONVERT (DTS_MONO, DTS_DOLBY):
adjust = (sample_t)(LEVEL (LEVEL_PLUS3DB));
break;
case CONVERT (DTS_3F, DTS_DOLBY):
case CONVERT (DTS_2F1R, DTS_DOLBY):
adjust = (sample_t)(LEVEL (1 / (1 + LEVEL_3DB)));
break;
case CONVERT (DTS_3F1R, DTS_DOLBY):
case CONVERT (DTS_2F2R, DTS_DOLBY):
adjust = (sample_t)(LEVEL (1 / (1 + 2 * LEVEL_3DB)));
break;
case CONVERT (DTS_3F2R, DTS_DOLBY):
adjust = (sample_t)(LEVEL (1 / (1 + 3 * LEVEL_3DB)));
break;
default:
return output;
}
*level = MUL_L (*level, adjust);
}
return output;
}
int dts_downmix_coeff (level_t * coeff, int acmod, int output, level_t level,
level_t clev, level_t slev)
{
level_t level_3db;
level_3db = (sample_t)(MUL_C (level, LEVEL_3DB));
switch (CONVERT (acmod, output & DTS_CHANNEL_MASK)) {
case CONVERT (DTS_CHANNEL, DTS_CHANNEL):
case CONVERT (DTS_MONO, DTS_MONO):
case CONVERT (DTS_STEREO, DTS_STEREO):
case CONVERT (DTS_3F, DTS_3F):
case CONVERT (DTS_2F1R, DTS_2F1R):
case CONVERT (DTS_3F1R, DTS_3F1R):
case CONVERT (DTS_2F2R, DTS_2F2R):
case CONVERT (DTS_3F2R, DTS_3F2R):
case CONVERT (DTS_STEREO, DTS_DOLBY):
coeff[0] = coeff[1] = coeff[2] = coeff[3] = coeff[4] = level;
return 0;
case CONVERT (DTS_CHANNEL, DTS_MONO):
coeff[0] = coeff[1] = (sample_t)(MUL_C (level, LEVEL_6DB));
return 3;
case CONVERT (DTS_STEREO, DTS_MONO):
coeff[0] = coeff[1] = level_3db;
return 3;
case CONVERT (DTS_3F, DTS_MONO):
coeff[0] = coeff[2] = level_3db;
coeff[1] = (sample_t)(MUL_C (MUL_L (level_3db, clev), LEVEL_PLUS6DB));
return 7;
case CONVERT (DTS_2F1R, DTS_MONO):
coeff[0] = coeff[1] = level_3db;
coeff[2] = MUL_L (level_3db, slev);
return 7;
case CONVERT (DTS_2F2R, DTS_MONO):
coeff[0] = coeff[1] = level_3db;
coeff[2] = coeff[3] = MUL_L (level_3db, slev);
return 15;
case CONVERT (DTS_3F1R, DTS_MONO):
coeff[0] = coeff[2] = level_3db;
coeff[1] = (sample_t)(MUL_C (MUL_L (level_3db, clev), LEVEL_PLUS6DB));
coeff[3] = MUL_L (level_3db, slev);
return 15;
case CONVERT (DTS_3F2R, DTS_MONO):
coeff[0] = coeff[2] = level_3db;
coeff[1] = (sample_t)(MUL_C (MUL_L (level_3db, clev), LEVEL_PLUS6DB));
coeff[3] = coeff[4] = MUL_L (level_3db, slev);
return 31;
case CONVERT (DTS_MONO, DTS_DOLBY):
coeff[0] = level_3db;
return 0;
case CONVERT (DTS_3F, DTS_DOLBY):
coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
coeff[1] = level_3db;
return 7;
case CONVERT (DTS_3F, DTS_STEREO):
case CONVERT (DTS_3F1R, DTS_2F1R):
case CONVERT (DTS_3F2R, DTS_2F2R):
coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
coeff[1] = MUL_L (level, clev);
return 7;
case CONVERT (DTS_2F1R, DTS_DOLBY):
coeff[0] = coeff[1] = level;
coeff[2] = level_3db;
return 7;
case CONVERT (DTS_2F1R, DTS_STEREO):
coeff[0] = coeff[1] = level;
coeff[2] = MUL_L (level_3db, slev);
return 7;
case CONVERT (DTS_3F1R, DTS_DOLBY):
coeff[0] = coeff[2] = level;
coeff[1] = coeff[3] = level_3db;
return 15;
case CONVERT (DTS_3F1R, DTS_STEREO):
coeff[0] = coeff[2] = level;
coeff[1] = MUL_L (level, clev);
coeff[3] = MUL_L (level_3db, slev);
return 15;
case CONVERT (DTS_2F2R, DTS_DOLBY):
coeff[0] = coeff[1] = level;
coeff[2] = coeff[3] = level_3db;
return 15;
case CONVERT (DTS_2F2R, DTS_STEREO):
coeff[0] = coeff[1] = level;
coeff[2] = coeff[3] = MUL_L (level, slev);
return 15;
case CONVERT (DTS_3F2R, DTS_DOLBY):
coeff[0] = coeff[2] = level;
coeff[1] = coeff[3] = coeff[4] = level_3db;
return 31;
case CONVERT (DTS_3F2R, DTS_2F1R):
coeff[0] = coeff[2] = level;
coeff[1] = MUL_L (level, clev);
coeff[3] = coeff[4] = level_3db;
return 31;
case CONVERT (DTS_3F2R, DTS_STEREO):
coeff[0] = coeff[2] = level;
coeff[1] = MUL_L (level, clev);
coeff[3] = coeff[4] = MUL_L (level, slev);
return 31;
case CONVERT (DTS_3F1R, DTS_3F):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = MUL_L (level_3db, slev);
return 13;
case CONVERT (DTS_3F2R, DTS_3F):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = coeff[4] = MUL_L (level, slev);
return 29;
case CONVERT (DTS_2F2R, DTS_2F1R):
coeff[0] = coeff[1] = level;
coeff[2] = coeff[3] = level_3db;
return 12;
case CONVERT (DTS_3F2R, DTS_3F1R):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = coeff[4] = level_3db;
return 24;
case CONVERT (DTS_2F1R, DTS_2F2R):
coeff[0] = coeff[1] = level;
coeff[2] = level_3db;
return 0;
case CONVERT (DTS_3F1R, DTS_2F2R):
coeff[0] = coeff[2] = level;
coeff[1] = MUL_L (level, clev);
coeff[3] = level_3db;
return 7;
case CONVERT (DTS_3F1R, DTS_3F2R):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = level_3db;
return 0;
}
return -1; /* NOTREACHED */
}
static void mix2to1 (sample_t * dest, sample_t * src, sample_t bias)
{
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -