+++ /dev/null
-/*
- * downmix.c
- * 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 a52dec, a free ATSC A-52 stream decoder.
- * See http://liba52.sourceforge.net/ for updates.
- *
- * a52dec 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.
- *
- * a52dec 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 "a52.h"
-#include "a52_internal.h"
-
-#define CONVERT(acmod,output) (((output) << 3) + (acmod))
-
-int a52_downmix_init (int input, int flags, level_t * level,
- level_t clev, level_t slev)
-{
- static uint8_t table[11][8] = {
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
- A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO},
- {A52_MONO, A52_MONO, A52_MONO, A52_MONO,
- A52_MONO, A52_MONO, A52_MONO, A52_MONO},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
- A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
- A52_STEREO, A52_3F, A52_STEREO, A52_3F},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
- A52_2F1R, A52_2F1R, A52_2F1R, A52_2F1R},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
- A52_2F1R, A52_3F1R, A52_2F1R, A52_3F1R},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
- A52_2F2R, A52_2F2R, A52_2F2R, A52_2F2R},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
- A52_2F2R, A52_3F2R, A52_2F2R, A52_3F2R},
- {A52_CHANNEL1, A52_MONO, A52_MONO, A52_MONO,
- A52_MONO, A52_MONO, A52_MONO, A52_MONO},
- {A52_CHANNEL2, A52_MONO, A52_MONO, A52_MONO,
- A52_MONO, A52_MONO, A52_MONO, A52_MONO},
- {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_DOLBY,
- A52_DOLBY, A52_DOLBY, A52_DOLBY, A52_DOLBY}
- };
- int output;
-
- output = flags & A52_CHANNEL_MASK;
- if (output > A52_DOLBY)
- return -1;
-
- output = table[output][input & 7];
-
- if (output == A52_STEREO &&
- (input == A52_DOLBY || (input == A52_3F && clev == LEVEL (LEVEL_3DB))))
- output = A52_DOLBY;
-
- if (flags & A52_ADJUST_LEVEL) {
- level_t adjust;
-
- switch (CONVERT (input & 7, output)) {
-
- case CONVERT (A52_3F, A52_MONO):
- adjust = DIV (LEVEL_3DB, LEVEL (1) + clev);
- break;
-
- case CONVERT (A52_STEREO, A52_MONO):
- case CONVERT (A52_2F2R, A52_2F1R):
- case CONVERT (A52_3F2R, A52_3F1R):
- level_3db:
- adjust = LEVEL (LEVEL_3DB);
- break;
-
- case CONVERT (A52_3F2R, A52_2F1R):
- if (clev < LEVEL (LEVEL_PLUS3DB - 1))
- goto level_3db;
- /* break thru */
- case CONVERT (A52_3F, A52_STEREO):
- case CONVERT (A52_3F1R, A52_2F1R):
- case CONVERT (A52_3F1R, A52_2F2R):
- case CONVERT (A52_3F2R, A52_2F2R):
- adjust = DIV (1, LEVEL (1) + clev);
- break;
-
- case CONVERT (A52_2F1R, A52_MONO):
- adjust = DIV (LEVEL_PLUS3DB, LEVEL (2) + slev);
- break;
-
- case CONVERT (A52_2F1R, A52_STEREO):
- case CONVERT (A52_3F1R, A52_3F):
- adjust = DIV (1, LEVEL (1) + MUL_C (slev, LEVEL_3DB));
- break;
-
- case CONVERT (A52_3F1R, A52_MONO):
- adjust = DIV (LEVEL_3DB, LEVEL (1) + clev + MUL_C (slev, 0.5));
- break;
-
- case CONVERT (A52_3F1R, A52_STEREO):
- adjust = DIV (1, LEVEL (1) + clev + MUL_C (slev, LEVEL_3DB));
- break;
-
- case CONVERT (A52_2F2R, A52_MONO):
- adjust = DIV (LEVEL_3DB, LEVEL (1) + slev);
- break;
-
- case CONVERT (A52_2F2R, A52_STEREO):
- case CONVERT (A52_3F2R, A52_3F):
- adjust = DIV (1, LEVEL (1) + slev);
- break;
-
- case CONVERT (A52_3F2R, A52_MONO):
- adjust = DIV (LEVEL_3DB, LEVEL (1) + clev + slev);
- break;
-
- case CONVERT (A52_3F2R, A52_STEREO):
- adjust = DIV (1, LEVEL (1) + clev + slev);
- break;
-
- case CONVERT (A52_MONO, A52_DOLBY):
- adjust = LEVEL (LEVEL_PLUS3DB);
- break;
-
- case CONVERT (A52_3F, A52_DOLBY):
- case CONVERT (A52_2F1R, A52_DOLBY):
- adjust = LEVEL (1 / (1 + LEVEL_3DB));
- break;
-
- case CONVERT (A52_3F1R, A52_DOLBY):
- case CONVERT (A52_2F2R, A52_DOLBY):
- adjust = LEVEL (1 / (1 + 2 * LEVEL_3DB));
- break;
-
- case CONVERT (A52_3F2R, A52_DOLBY):
- adjust = LEVEL (1 / (1 + 3 * LEVEL_3DB));
- break;
-
- default:
- return output;
- }
-
- *level = MUL_L (*level, adjust);
- }
-
- return output;
-}
-
-int a52_downmix_coeff (level_t * coeff, int acmod, int output, level_t level,
- level_t clev, level_t slev)
-{
- level_t level_3db;
-
- level_3db = MUL_C (level, LEVEL_3DB);
-
- switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
-
- case CONVERT (A52_CHANNEL, A52_CHANNEL):
- case CONVERT (A52_MONO, A52_MONO):
- case CONVERT (A52_STEREO, A52_STEREO):
- case CONVERT (A52_3F, A52_3F):
- case CONVERT (A52_2F1R, A52_2F1R):
- case CONVERT (A52_3F1R, A52_3F1R):
- case CONVERT (A52_2F2R, A52_2F2R):
- case CONVERT (A52_3F2R, A52_3F2R):
- case CONVERT (A52_STEREO, A52_DOLBY):
- coeff[0] = coeff[1] = coeff[2] = coeff[3] = coeff[4] = level;
- return 0;
-
- case CONVERT (A52_CHANNEL, A52_MONO):
- coeff[0] = coeff[1] = MUL_C (level, LEVEL_6DB);
- return 3;
-
- case CONVERT (A52_STEREO, A52_MONO):
- coeff[0] = coeff[1] = level_3db;
- return 3;
-
- case CONVERT (A52_3F, A52_MONO):
- coeff[0] = coeff[2] = level_3db;
- coeff[1] = MUL_C (MUL_L (level_3db, clev), LEVEL_PLUS6DB);
- return 7;
-
- case CONVERT (A52_2F1R, A52_MONO):
- coeff[0] = coeff[1] = level_3db;
- coeff[2] = MUL_L (level_3db, slev);
- return 7;
-
- case CONVERT (A52_2F2R, A52_MONO):
- coeff[0] = coeff[1] = level_3db;
- coeff[2] = coeff[3] = MUL_L (level_3db, slev);
- return 15;
-
- case CONVERT (A52_3F1R, A52_MONO):
- coeff[0] = coeff[2] = level_3db;
- coeff[1] = MUL_C (MUL_L (level_3db, clev), LEVEL_PLUS6DB);
- coeff[3] = MUL_L (level_3db, slev);
- return 15;
-
- case CONVERT (A52_3F2R, A52_MONO):
- coeff[0] = coeff[2] = level_3db;
- coeff[1] = MUL_C (MUL_L (level_3db, clev), LEVEL_PLUS6DB);
- coeff[3] = coeff[4] = MUL_L (level_3db, slev);
- return 31;
-
- case CONVERT (A52_MONO, A52_DOLBY):
- coeff[0] = level_3db;
- return 0;
-
- case CONVERT (A52_3F, A52_DOLBY):
- coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
- coeff[1] = level_3db;
- return 7;
-
- case CONVERT (A52_3F, A52_STEREO):
- case CONVERT (A52_3F1R, A52_2F1R):
- case CONVERT (A52_3F2R, A52_2F2R):
- coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
- coeff[1] = MUL_L (level, clev);
- return 7;
-
- case CONVERT (A52_2F1R, A52_DOLBY):
- coeff[0] = coeff[1] = level;
- coeff[2] = level_3db;
- return 7;
-
- case CONVERT (A52_2F1R, A52_STEREO):
- coeff[0] = coeff[1] = level;
- coeff[2] = MUL_L (level_3db, slev);
- return 7;
-
- case CONVERT (A52_3F1R, A52_DOLBY):
- coeff[0] = coeff[2] = level;
- coeff[1] = coeff[3] = level_3db;
- return 15;
-
- case CONVERT (A52_3F1R, A52_STEREO):
- coeff[0] = coeff[2] = level;
- coeff[1] = MUL_L (level, clev);
- coeff[3] = MUL_L (level_3db, slev);
- return 15;
-
- case CONVERT (A52_2F2R, A52_DOLBY):
- coeff[0] = coeff[1] = level;
- coeff[2] = coeff[3] = level_3db;
- return 15;
-
- case CONVERT (A52_2F2R, A52_STEREO):
- coeff[0] = coeff[1] = level;
- coeff[2] = coeff[3] = MUL_L (level, slev);
- return 15;
-
- case CONVERT (A52_3F2R, A52_DOLBY):
- coeff[0] = coeff[2] = level;
- coeff[1] = coeff[3] = coeff[4] = level_3db;
- return 31;
-
- case CONVERT (A52_3F2R, A52_2F1R):
- coeff[0] = coeff[2] = level;
- coeff[1] = MUL_L (level, clev);
- coeff[3] = coeff[4] = level_3db;
- return 31;
-
- case CONVERT (A52_3F2R, A52_STEREO):
- coeff[0] = coeff[2] = level;
- coeff[1] = MUL_L (level, clev);
- coeff[3] = coeff[4] = MUL_L (level, slev);
- return 31;
-
- case CONVERT (A52_3F1R, A52_3F):
- coeff[0] = coeff[1] = coeff[2] = level;
- coeff[3] = MUL_L (level_3db, slev);
- return 13;
-
- case CONVERT (A52_3F2R, A52_3F):
- coeff[0] = coeff[1] = coeff[2] = level;
- coeff[3] = coeff[4] = MUL_L (level, slev);
- return 29;
-
- case CONVERT (A52_2F2R, A52_2F1R):
- coeff[0] = coeff[1] = level;
- coeff[2] = coeff[3] = level_3db;
- return 12;
-
- case CONVERT (A52_3F2R, A52_3F1R):
- coeff[0] = coeff[1] = coeff[2] = level;
- coeff[3] = coeff[4] = level_3db;
- return 24;
-
- case CONVERT (A52_2F1R, A52_2F2R):
- coeff[0] = coeff[1] = level;
- coeff[2] = level_3db;
- return 0;
-
- case CONVERT (A52_3F1R, A52_2F2R):
- coeff[0] = coeff[2] = level;
- coeff[1] = MUL_L (level, clev);
- coeff[3] = level_3db;
- return 7;
-
- case CONVERT (A52_3F1R, A52_3F2R):
- coeff[0] = coeff[1] = coeff[2] = level;
- coeff[3] = level_3db;
- return 0;
-
- case CONVERT (A52_CHANNEL, A52_CHANNEL1):
- coeff[0] = level;
- coeff[1] = 0;
- return 0;
-
- case CONVERT (A52_CHANNEL, A52_CHANNEL2):
- coeff[0] = 0;
- coeff[1] = level;
- return 0;
- }
-
- return -1; /* NOTREACHED */
-}
-
-static void mix2to1 (sample_t * dest, sample_t * src, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- dest[i] += BIAS (src[i]);
-}
-
-static void mix3to1 (sample_t * samples, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] += BIAS (samples[i + 256] + samples[i + 512]);
-}
-
-static void mix4to1 (sample_t * samples, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] += BIAS (samples[i + 256] + samples[i + 512] +
- samples[i + 768]);
-}
-
-static void mix5to1 (sample_t * samples, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] += BIAS (samples[i + 256] + samples[i + 512] +
- samples[i + 768] + samples[i + 1024]);
-}
-
-static void mix3to2 (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = BIAS (samples[i + 256]);
- samples[i] += common;
- samples[i + 256] = samples[i + 512] + common;
- }
-}
-
-static void mix21to2 (sample_t * left, sample_t * right, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = BIAS (right[i + 256]);
- left[i] += common;
- right[i] += common;
- }
-}
-
-static void mix21toS (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t surround;
-
- for (i = 0; i < 256; i++) {
- surround = samples[i + 512];
- samples[i] += BIAS (-surround);
- samples[i + 256] += BIAS (surround);
- }
-}
-
-static void mix31to2 (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = BIAS (samples[i + 256] + samples[i + 768]);
- samples[i] += common;
- samples[i + 256] = samples[i + 512] + common;
- }
-}
-
-static void mix31toS (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t common, surround;
-
- for (i = 0; i < 256; i++) {
- common = BIAS (samples[i + 256]);
- surround = samples[i + 768];
- samples[i] += common - surround;
- samples[i + 256] = samples[i + 512] + common + surround;
- }
-}
-
-static void mix22toS (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t surround;
-
- for (i = 0; i < 256; i++) {
- surround = samples[i + 512] + samples[i + 768];
- samples[i] += BIAS (-surround);
- samples[i + 256] += BIAS (surround);
- }
-}
-
-static void mix32to2 (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = BIAS (samples[i + 256]);
- samples[i] += common + samples[i + 768];
- samples[i + 256] = common + samples[i + 512] + samples[i + 1024];
- }
-}
-
-static void mix32toS (sample_t * samples, sample_t bias)
-{
- int i;
- sample_t common, surround;
-
- for (i = 0; i < 256; i++) {
- common = BIAS (samples[i + 256]);
- surround = samples[i + 768] + samples[i + 1024];
- samples[i] += common - surround;
- samples[i + 256] = samples[i + 512] + common + surround;
- }
-}
-
-static void move2to1 (sample_t * src, sample_t * dest, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- dest[i] = BIAS (src[i] + src[i + 256]);
-}
-
-static void zero (sample_t * samples)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = 0;
-}
-
-void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
- level_t clev, level_t slev)
-{
- switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
-
- case CONVERT (A52_CHANNEL, A52_CHANNEL2):
- memcpy (samples, samples + 256, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_CHANNEL, A52_MONO):
- case CONVERT (A52_STEREO, A52_MONO):
- mix_2to1:
- mix2to1 (samples, samples + 256, bias);
- break;
-
- case CONVERT (A52_2F1R, A52_MONO):
- if (slev == 0)
- goto mix_2to1;
- case CONVERT (A52_3F, A52_MONO):
- mix_3to1:
- mix3to1 (samples, bias);
- break;
-
- case CONVERT (A52_3F1R, A52_MONO):
- if (slev == 0)
- goto mix_3to1;
- case CONVERT (A52_2F2R, A52_MONO):
- if (slev == 0)
- goto mix_2to1;
- mix4to1 (samples, bias);
- break;
-
- case CONVERT (A52_3F2R, A52_MONO):
- if (slev == 0)
- goto mix_3to1;
- mix5to1 (samples, bias);
- break;
-
- case CONVERT (A52_MONO, A52_DOLBY):
- memcpy (samples + 256, samples, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_3F, A52_STEREO):
- case CONVERT (A52_3F, A52_DOLBY):
- mix_3to2:
- mix3to2 (samples, bias);
- break;
-
- case CONVERT (A52_2F1R, A52_STEREO):
- if (slev == 0)
- break;
- mix21to2 (samples, samples + 256, bias);
- break;
-
- case CONVERT (A52_2F1R, A52_DOLBY):
- mix21toS (samples, bias);
- break;
-
- case CONVERT (A52_3F1R, A52_STEREO):
- if (slev == 0)
- goto mix_3to2;
- mix31to2 (samples, bias);
- break;
-
- case CONVERT (A52_3F1R, A52_DOLBY):
- mix31toS (samples, bias);
- break;
-
- case CONVERT (A52_2F2R, A52_STEREO):
- if (slev == 0)
- break;
- mix2to1 (samples, samples + 512, bias);
- mix2to1 (samples + 256, samples + 768, bias);
- break;
-
- case CONVERT (A52_2F2R, A52_DOLBY):
- mix22toS (samples, bias);
- break;
-
- case CONVERT (A52_3F2R, A52_STEREO):
- if (slev == 0)
- goto mix_3to2;
- mix32to2 (samples, bias);
- break;
-
- case CONVERT (A52_3F2R, A52_DOLBY):
- mix32toS (samples, bias);
- break;
-
- case CONVERT (A52_3F1R, A52_3F):
- if (slev == 0)
- break;
- mix21to2 (samples, samples + 512, bias);
- break;
-
- case CONVERT (A52_3F2R, A52_3F):
- if (slev == 0)
- break;
- mix2to1 (samples, samples + 768, bias);
- mix2to1 (samples + 512, samples + 1024, bias);
- break;
-
- case CONVERT (A52_3F1R, A52_2F1R):
- mix3to2 (samples, bias);
- memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_2F2R, A52_2F1R):
- mix2to1 (samples + 512, samples + 768, bias);
- break;
-
- case CONVERT (A52_3F2R, A52_2F1R):
- mix3to2 (samples, bias);
- move2to1 (samples + 768, samples + 512, bias);
- break;
-
- case CONVERT (A52_3F2R, A52_3F1R):
- mix2to1 (samples + 768, samples + 1024, bias);
- break;
-
- case CONVERT (A52_2F1R, A52_2F2R):
- memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_3F1R, A52_2F2R):
- mix3to2 (samples, bias);
- memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_3F2R, A52_2F2R):
- mix3to2 (samples, bias);
- memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
- memcpy (samples + 768, samples + 1024, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_3F1R, A52_3F2R):
- memcpy (samples + 1024, samples + 768, 256 * sizeof (sample_t));
- break;
- }
-}
-
-void a52_upmix (sample_t * samples, int acmod, int output)
-{
- switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
-
- case CONVERT (A52_CHANNEL, A52_CHANNEL2):
- memcpy (samples + 256, samples, 256 * sizeof (sample_t));
- break;
-
- case CONVERT (A52_3F2R, A52_MONO):
- zero (samples + 1024);
- case CONVERT (A52_3F1R, A52_MONO):
- case CONVERT (A52_2F2R, A52_MONO):
- zero (samples + 768);
- case CONVERT (A52_3F, A52_MONO):
- case CONVERT (A52_2F1R, A52_MONO):
- zero (samples + 512);
- case CONVERT (A52_CHANNEL, A52_MONO):
- case CONVERT (A52_STEREO, A52_MONO):
- zero (samples + 256);
- break;
-
- case CONVERT (A52_3F2R, A52_STEREO):
- case CONVERT (A52_3F2R, A52_DOLBY):
- zero (samples + 1024);
- case CONVERT (A52_3F1R, A52_STEREO):
- case CONVERT (A52_3F1R, A52_DOLBY):
- zero (samples + 768);
- case CONVERT (A52_3F, A52_STEREO):
- case CONVERT (A52_3F, A52_DOLBY):
- mix_3to2:
- memcpy (samples + 512, samples + 256, 256 * sizeof (sample_t));
- zero (samples + 256);
- break;
-
- case CONVERT (A52_2F2R, A52_STEREO):
- case CONVERT (A52_2F2R, A52_DOLBY):
- zero (samples + 768);
- case CONVERT (A52_2F1R, A52_STEREO):
- case CONVERT (A52_2F1R, A52_DOLBY):
- zero (samples + 512);
- break;
-
- case CONVERT (A52_3F2R, A52_3F):
- zero (samples + 1024);
- case CONVERT (A52_3F1R, A52_3F):
- case CONVERT (A52_2F2R, A52_2F1R):
- zero (samples + 768);
- break;
-
- case CONVERT (A52_3F2R, A52_3F1R):
- zero (samples + 1024);
- break;
-
- case CONVERT (A52_3F2R, A52_2F1R):
- zero (samples + 1024);
- case CONVERT (A52_3F1R, A52_2F1R):
- mix_31to21:
- memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t));
- goto mix_3to2;
-
- case CONVERT (A52_3F2R, A52_2F2R):
- memcpy (samples + 1024, samples + 768, 256 * sizeof (sample_t));
- goto mix_31to21;
- }
-}
projects / synfig.git / blobdiff