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-rw-r--r--src/libac3/downmix.c546
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diff --git a/src/libac3/downmix.c b/src/libac3/downmix.c
deleted file mode 100644
index 498471798..000000000
--- a/src/libac3/downmix.c
+++ /dev/null
@@ -1,546 +0,0 @@
-/*
- *
- * downmix.c
- *
- * Copyright (C) Aaron Holtzman - Sept 1999
- *
- * Originally based on code by Yuqing Deng.
- *
- * This file is part of ac3dec, a free Dolby AC-3 stream decoder.
- *
- * ac3dec 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, or (at your option)
- * any later version.
- *
- * ac3dec 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 GNU Make; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *
- */
-
-#include "config.h"
-
-#include <inttypes.h>
-
-#include "ac3.h"
-#include "ac3_internal.h"
-
-
-#define CONVERT(acmod,output) (((output) << 3) + (acmod))
-
-int downmix_init (int input, int flags, sample_t * level,
- sample_t clev, sample_t slev)
-{
- static uint8_t table[11][8] = {
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
- AC3_STEREO, AC3_STEREO, AC3_STEREO, AC3_STEREO},
- {AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO,
- AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
- AC3_STEREO, AC3_STEREO, AC3_STEREO, AC3_STEREO},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_3F,
- AC3_STEREO, AC3_3F, AC3_STEREO, AC3_3F},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
- AC3_2F1R, AC3_2F1R, AC3_2F1R, AC3_2F1R},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
- AC3_2F1R, AC3_3F1R, AC3_2F1R, AC3_3F1R},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_3F,
- AC3_2F2R, AC3_2F2R, AC3_2F2R, AC3_2F2R},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_3F,
- AC3_2F2R, AC3_3F2R, AC3_2F2R, AC3_3F2R},
- {AC3_CHANNEL1, AC3_MONO, AC3_MONO, AC3_MONO,
- AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO},
- {AC3_CHANNEL2, AC3_MONO, AC3_MONO, AC3_MONO,
- AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO},
- {AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_DOLBY,
- AC3_DOLBY, AC3_DOLBY, AC3_DOLBY, AC3_DOLBY}
- };
- int output;
-
- output = flags & AC3_CHANNEL_MASK;
- if (output > AC3_DOLBY)
- return -1;
-
- output = table[output][input & 7];
-
- if ((output == AC3_STEREO) &&
- ((input == AC3_DOLBY) || ((input == AC3_3F) && (clev == LEVEL_3DB))))
- output = AC3_DOLBY;
-
- if (flags & AC3_ADJUST_LEVEL)
- switch (CONVERT (input & 7, output)) {
-
- case CONVERT (AC3_3F, AC3_MONO):
- *level *= LEVEL_3DB / (1 + clev);
- break;
-
- case CONVERT (AC3_STEREO, AC3_MONO):
- case CONVERT (AC3_2F2R, AC3_2F1R):
- case CONVERT (AC3_3F2R, AC3_3F1R):
- level_3db:
- *level *= LEVEL_3DB;
- break;
-
- case CONVERT (AC3_3F2R, AC3_2F1R):
- if (clev < LEVEL_PLUS3DB - 1)
- goto level_3db;
- // break thru
- case CONVERT (AC3_3F, AC3_STEREO):
- case CONVERT (AC3_3F1R, AC3_2F1R):
- case CONVERT (AC3_3F1R, AC3_2F2R):
- case CONVERT (AC3_3F2R, AC3_2F2R):
- *level /= 1 + clev;
- break;
-
- case CONVERT (AC3_2F1R, AC3_MONO):
- *level *= LEVEL_PLUS3DB / (2 + slev);
- break;
-
- case CONVERT (AC3_2F1R, AC3_STEREO):
- case CONVERT (AC3_3F1R, AC3_3F):
- *level /= 1 + slev * LEVEL_3DB;
- break;
-
- case CONVERT (AC3_3F1R, AC3_MONO):
- *level *= LEVEL_3DB / (1 + clev + 0.5 * slev);
- break;
-
- case CONVERT (AC3_3F1R, AC3_STEREO):
- *level /= 1 + clev + slev * LEVEL_3DB;
- break;
-
- case CONVERT (AC3_2F2R, AC3_MONO):
- *level *= LEVEL_3DB / (1 + slev);
- break;
-
- case CONVERT (AC3_2F2R, AC3_STEREO):
- case CONVERT (AC3_3F2R, AC3_3F):
- *level /= (1 + slev);
- break;
-
- case CONVERT (AC3_3F2R, AC3_MONO):
- *level *= LEVEL_3DB / (1 + clev + slev);
- break;
-
- case CONVERT (AC3_3F2R, AC3_STEREO):
- *level /= 1 + clev + slev;
- break;
-
- case CONVERT (AC3_MONO, AC3_DOLBY):
- *level *= LEVEL_PLUS3DB;
- break;
-
- case CONVERT (AC3_3F, AC3_DOLBY):
- case CONVERT (AC3_2F1R, AC3_DOLBY):
- *level *= 1 / (1 + LEVEL_3DB);
- break;
-
- case CONVERT (AC3_3F1R, AC3_DOLBY):
- case CONVERT (AC3_2F2R, AC3_DOLBY):
- *level *= 1 / (1 + 2 * LEVEL_3DB);
- break;
-
- case CONVERT (AC3_3F2R, AC3_DOLBY):
- *level *= 1 / (1 + 3 * LEVEL_3DB);
- break;
- }
-
- return output;
-}
-
-static void mix1to1 (sample_t * samples, sample_t level, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = samples[i] * level + bias;
-}
-
-static void move1to1 (sample_t * src, sample_t * dest,
- sample_t level, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- dest[i] = src[i] * level + bias;
-}
-
-static void mix2to1 (sample_t * samples, sample_t level, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = (samples[i] + samples[i + 256]) * level + bias;
-}
-
-static void move2to1 (sample_t * src, sample_t * dest,
- sample_t level, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- dest[i] = (src[i] + src[i + 256]) * level + bias;
-}
-
-static void mix3to1 (sample_t * samples, sample_t level, sample_t clev,
- sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = ((samples[i] + samples[i + 512]) * level +
- samples[i + 256] * clev + bias);
-}
-
-static void mix21to1 (sample_t * samples, sample_t level, sample_t slev,
- sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = ((samples[i] + samples[i + 256]) * level +
- samples[i + 512] * slev + bias);
-}
-
-static void mix31to1 (sample_t * samples, sample_t level,
- sample_t clev, sample_t slev, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = ((samples[i] + samples[i + 512]) * level +
- samples[i + 256] * clev + samples[i + 768] * slev +
- bias);
-}
-
-static void mix22to1 (sample_t * samples, sample_t level, sample_t slev,
- sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = ((samples[i] + samples[i + 256]) * level +
- (samples[i + 512] + samples[i + 768]) * slev + bias);
-}
-
-static void mix32to1 (sample_t * samples, sample_t level,
- sample_t clev, sample_t slev, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- samples[i] = ((samples[i] + samples[i + 512]) * level +
- samples[i + 256] * clev +
- (samples[i + 768] + samples[i + 1024]) * slev + bias);
-}
-
-static void mix1to2 (sample_t * src, sample_t * dest,
- sample_t level, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- dest[i] = src[i] = src[i] * level + bias;
-}
-
-static void mix3to2 (sample_t * samples, sample_t level, sample_t clev,
- sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = samples[i + 256] * clev + bias;
- samples[i] = samples[i] * level + common;
- samples[i + 256] = samples[i + 512] * level + common;
- }
-}
-
-static void mix21to2 (sample_t * left, sample_t * right,
- sample_t level, sample_t slev, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = right[i + 256] * slev + bias;
- left[i] = left[i] * level + common;
- right[i] = right[i] * level + common;
- }
-}
-
-static void mix11to1 (sample_t * front, sample_t * rear,
- sample_t level, sample_t slev, sample_t bias)
-{
- int i;
-
- for (i = 0; i < 256; i++)
- front[i] = front[i] * level + rear[i] * slev + bias;
-}
-
-static void mix31to2 (sample_t * samples, sample_t level,
- sample_t clev, sample_t slev, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = samples[i + 256] * clev + samples[i + 768] * slev + bias;
- samples[i] = samples[i] * level + common;
- samples[i + 256] = samples[i + 512] * level + common;
- }
-}
-
-static void mix32to2 (sample_t * samples, sample_t level,
- sample_t clev, sample_t slev, sample_t bias)
-{
- int i;
- sample_t common;
-
- for (i = 0; i < 256; i++) {
- common = samples[i + 256] * clev + bias;
- samples[i] = samples[i] * level + common + samples[i + 768] * slev;
- samples[i + 256] = (samples[i + 512] * level + common +
- samples[i + 1024] * slev);
- }
-}
-
-static void mix21toS (sample_t * samples,
- sample_t level, sample_t level3db, sample_t bias)
-{
- int i;
- sample_t surround;
-
- for (i = 0; i < 256; i++) {
- surround = samples[i + 512] * level3db;
- samples[i] = samples[i] * level - surround + bias;
- samples[i + 256] = samples[i + 256] * level + surround + bias;
- }
-}
-
-static void mix22toS (sample_t * samples,
- sample_t level, sample_t level3db, sample_t bias)
-{
- int i;
- sample_t surround;
-
- for (i = 0; i < 256; i++) {
- surround = (samples[i + 512] + samples[i + 768]) * level3db;
- samples[i] = samples[i] * level - surround + bias;
- samples[i + 256] = samples[i + 256] * level + surround + bias;
- }
-}
-
-static void mix31toS (sample_t * samples,
- sample_t level, sample_t level3db, sample_t bias)
-{
- int i;
- sample_t common, surround;
-
- for (i = 0; i < 256; i++) {
- common = samples[i + 256] * level3db + bias;
- surround = samples[i + 768] * level3db;
- samples[i] = samples[i] * level + common - surround;
- samples[i + 256] = samples[i + 512] * level + common + surround;
- }
-}
-
-static void mix32toS (sample_t * samples,
- sample_t level, sample_t level3db, sample_t bias)
-{
- int i;
- sample_t common, surround;
-
- for (i = 0; i < 256; i++) {
- common = samples[i + 256] * level3db + bias;
- surround = (samples[i + 768] + samples[i + 1024]) * level3db;
- samples[i] = samples[i] * level + common - surround;
- samples[i + 256] = samples[i + 512] * level + common + surround;
- }
-}
-
-void downmix (sample_t * samples, int acmod, int output,
- sample_t level, sample_t bias, sample_t clev, sample_t slev)
-{
- switch (CONVERT (acmod, output & AC3_CHANNEL_MASK)) {
-
- case CONVERT (AC3_3F2R, AC3_3F2R):
- mix1to1 (samples + 1024, level, bias);
- case CONVERT (AC3_3F1R, AC3_3F1R):
- case CONVERT (AC3_2F2R, AC3_2F2R):
- mix1to1 (samples + 768, level, bias);
- case CONVERT (AC3_3F, AC3_3F):
- case CONVERT (AC3_2F1R, AC3_2F1R):
- mix_3to3:
- mix1to1 (samples + 512, level, bias);
- case CONVERT (AC3_CHANNEL, AC3_CHANNEL):
- case CONVERT (AC3_STEREO, AC3_STEREO):
- case CONVERT (AC3_STEREO, AC3_DOLBY):
- mix_2to2:
- mix1to1 (samples + 256, level, bias);
- case CONVERT (AC3_CHANNEL, AC3_CHANNEL1):
- case CONVERT (AC3_MONO, AC3_MONO):
- mix1to1 (samples, level, bias);
- break;
-
- case CONVERT (AC3_CHANNEL, AC3_CHANNEL2):
- move1to1 (samples + 256, samples, level, bias);
- break;
-
- case CONVERT (AC3_STEREO, AC3_MONO):
- mix_2to1:
- mix2to1 (samples, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_2F1R, AC3_MONO):
- if (slev == 0)
- goto mix_2to1;
- mix21to1 (samples, level * LEVEL_3DB, level * slev * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_2F2R, AC3_MONO):
- if (slev == 0)
- goto mix_2to1;
- mix22to1 (samples, level * LEVEL_3DB, level * slev * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F, AC3_MONO):
- mix_3to1:
- mix3to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
- bias);
- break;
-
- case CONVERT (AC3_3F1R, AC3_MONO):
- if (slev == 0)
- goto mix_3to1;
- mix31to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
- level * slev * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F2R, AC3_MONO):
- if (slev == 0)
- goto mix_3to1;
- mix32to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
- level * slev * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_CHANNEL, AC3_MONO):
- mix2to1 (samples, level * LEVEL_6DB, bias);
- break;
-
- case CONVERT (AC3_MONO, AC3_DOLBY):
- mix1to2 (samples, samples + 256, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F, AC3_DOLBY):
- clev = LEVEL_3DB;
- case CONVERT (AC3_3F, AC3_STEREO):
- mix_3to2:
- mix3to2 (samples, level, level * clev, bias);
- break;
-
- case CONVERT (AC3_2F1R, AC3_DOLBY):
- mix21toS (samples, level, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F1R, AC3_DOLBY):
- mix31toS (samples, level, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_2F2R, AC3_DOLBY):
- mix22toS (samples, level, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F2R, AC3_DOLBY):
- mix32toS (samples, level, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_2F1R, AC3_STEREO):
- if (slev == 0)
- goto mix_2to2;
- mix21to2 (samples, samples + 256, level, level * slev * LEVEL_3DB,
- bias);
- break;
-
- case CONVERT (AC3_3F1R, AC3_STEREO):
- if (slev == 0)
- goto mix_3to2;
- mix31to2 (samples, level, level * clev, level * slev * LEVEL_3DB,
- bias);
- break;
-
- case CONVERT (AC3_2F2R, AC3_STEREO):
- if (slev == 0)
- goto mix_2to2;
- mix11to1 (samples, samples + 512, level, level * slev, bias);
- mix11to1 (samples + 256, samples + 768, level, level * slev, bias);
- break;
-
- case CONVERT (AC3_3F2R, AC3_STEREO):
- if (slev == 0)
- goto mix_3to2;
- mix32to2 (samples, level, level * clev, level * slev, bias);
- break;
-
- case CONVERT (AC3_3F1R, AC3_3F):
- if (slev == 0)
- goto mix_3to3;
- mix21to2 (samples, samples + 512, level, level * slev * LEVEL_3DB,
- bias);
-
- case CONVERT (AC3_3F2R, AC3_3F):
- if (slev == 0)
- goto mix_3to3;
- mix11to1 (samples, samples + 768, level, level * slev, bias);
- mix11to1 (samples + 512, samples + 1024, level, level * slev, bias);
- mix1to1 (samples + 256, level, bias);
- break;
-
- case CONVERT (AC3_2F1R, AC3_2F2R):
- mix1to2 (samples + 512, samples + 768, level * LEVEL_3DB, bias);
- goto mix_2to2;
-
- case CONVERT (AC3_3F1R, AC3_3F2R):
- mix1to2 (samples + 768, samples + 1024, level * LEVEL_3DB, bias);
- goto mix_3to3;
-
- case CONVERT (AC3_2F2R, AC3_2F1R):
- mix2to1 (samples + 512, level * LEVEL_3DB, bias);
- goto mix_2to2;
-
- case CONVERT (AC3_3F2R, AC3_3F1R):
- mix2to1 (samples + 768, level * LEVEL_3DB, bias);
- goto mix_3to3;
-
- case CONVERT (AC3_3F1R, AC3_2F2R):
- mix3to2 (samples, level, level * clev, bias);
- mix1to2 (samples + 768, samples + 512, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F1R, AC3_2F1R):
- mix3to2 (samples, level, level * clev, bias);
- move1to1 (samples + 768, samples + 512, level, bias);
- break;
-
- case CONVERT (AC3_3F2R, AC3_2F1R):
- mix3to2 (samples, level, level * clev, bias);
- move2to1 (samples + 768, samples + 512, level * LEVEL_3DB, bias);
- break;
-
- case CONVERT (AC3_3F2R, AC3_2F2R):
- mix3to2 (samples, level, level * clev, bias);
- move1to1 (samples + 768, samples + 512, level, bias);
- move1to1 (samples + 1024, samples + 768, level, bias);
- break;
- }
-
- if (output & AC3_LFE)
- mix1to1 (samples - 256, level, bias);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-24 16:32:43 +0000