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531 lines
14 KiB
C
531 lines
14 KiB
C
/*
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*
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* downmix.c
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*
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* Copyright (C) Aaron Holtzman - Sept 1999
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*
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* Originally based on code by Yuqing Deng.
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*
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* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
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*
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* ac3dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* ac3dec is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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*/
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#include "../common.h"
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#include <math.h>
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#include "ac3.h"
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#include "ac3_internal.h"
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#define CONVERT(acmod,output) (((output) << 3) + (acmod))
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int downmix_init (int input, int flags, float * level, float clev, float slev)
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{
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static uint8_t table[11][8] = {
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
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AC3_STEREO, AC3_STEREO, AC3_STEREO, AC3_STEREO},
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{AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO,
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AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
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AC3_STEREO, AC3_STEREO, AC3_STEREO, AC3_STEREO},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_3F,
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AC3_STEREO, AC3_3F, AC3_STEREO, AC3_3F},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
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AC3_2F1R, AC3_2F1R, AC3_2F1R, AC3_2F1R},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_STEREO,
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AC3_2F1R, AC3_3F1R, AC3_2F1R, AC3_3F1R},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_3F,
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AC3_2F2R, AC3_2F2R, AC3_2F2R, AC3_2F2R},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_3F,
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AC3_2F2R, AC3_3F2R, AC3_2F2R, AC3_3F2R},
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{AC3_CHANNEL1, AC3_MONO, AC3_MONO, AC3_MONO,
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AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO},
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{AC3_CHANNEL2, AC3_MONO, AC3_MONO, AC3_MONO,
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AC3_MONO, AC3_MONO, AC3_MONO, AC3_MONO},
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{AC3_CHANNEL, AC3_DOLBY, AC3_STEREO, AC3_DOLBY,
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AC3_DOLBY, AC3_DOLBY, AC3_DOLBY, AC3_DOLBY}
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};
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int output;
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output = flags & AC3_CHANNEL_MASK;
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if (output > AC3_DOLBY)
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return -1;
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output = table[output][input & 7];
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if ((output == AC3_STEREO) &&
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((input == AC3_DOLBY) || ((input == AC3_3F) && (clev == LEVEL_3DB))))
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output = AC3_DOLBY;
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if (flags & AC3_ADJUST_LEVEL)
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switch (CONVERT (input & 7, output)) {
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case CONVERT (AC3_3F, AC3_MONO):
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*level *= LEVEL_3DB / (1 + clev);
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break;
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case CONVERT (AC3_STEREO, AC3_MONO):
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case CONVERT (AC3_2F2R, AC3_2F1R):
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case CONVERT (AC3_3F2R, AC3_3F1R):
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level_3db:
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*level *= LEVEL_3DB;
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break;
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case CONVERT (AC3_3F2R, AC3_2F1R):
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if (clev < LEVEL_PLUS3DB - 1)
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goto level_3db;
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// break thru
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case CONVERT (AC3_3F, AC3_STEREO):
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case CONVERT (AC3_3F1R, AC3_2F1R):
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case CONVERT (AC3_3F1R, AC3_2F2R):
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case CONVERT (AC3_3F2R, AC3_2F2R):
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*level /= 1 + clev;
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break;
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case CONVERT (AC3_2F1R, AC3_MONO):
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*level *= LEVEL_PLUS3DB / (2 + slev);
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break;
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case CONVERT (AC3_2F1R, AC3_STEREO):
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case CONVERT (AC3_3F1R, AC3_3F):
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*level /= 1 + slev * LEVEL_3DB;
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break;
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case CONVERT (AC3_3F1R, AC3_MONO):
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*level *= LEVEL_3DB / (1 + clev + 0.5 * slev);
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break;
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case CONVERT (AC3_3F1R, AC3_STEREO):
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*level /= 1 + clev + slev * LEVEL_3DB;
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break;
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case CONVERT (AC3_2F2R, AC3_MONO):
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*level *= LEVEL_3DB / (1 + slev);
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break;
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case CONVERT (AC3_2F2R, AC3_STEREO):
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case CONVERT (AC3_3F2R, AC3_3F):
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*level /= (1 + slev);
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break;
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case CONVERT (AC3_3F2R, AC3_MONO):
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*level *= LEVEL_3DB / (1 + clev + slev);
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break;
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case CONVERT (AC3_3F2R, AC3_STEREO):
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*level /= 1 + clev + slev;
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break;
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case CONVERT (AC3_MONO, AC3_DOLBY):
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*level *= LEVEL_PLUS3DB;
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break;
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case CONVERT (AC3_3F, AC3_DOLBY):
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case CONVERT (AC3_2F1R, AC3_DOLBY):
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*level *= 1 / (1 + LEVEL_3DB);
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break;
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case CONVERT (AC3_3F1R, AC3_DOLBY):
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case CONVERT (AC3_2F2R, AC3_DOLBY):
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*level *= 1 / (1 + 2 * LEVEL_3DB);
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break;
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case CONVERT (AC3_3F2R, AC3_DOLBY):
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*level *= 1 / (1 + 3 * LEVEL_3DB);
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break;
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}
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return output;
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}
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static void mix1to1 (float * samples, float level, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = samples[i] * level + bias;
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}
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static void move1to1 (float * src, float * dest, float level, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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dest[i] = src[i] * level + bias;
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}
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static void mix2to1 (float * samples, float level, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = (samples[i] + samples[i + 256]) * level + bias;
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}
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static void move2to1 (float * src, float * dest, float level, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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dest[i] = (src[i] + src[i + 256]) * level + bias;
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}
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static void mix3to1 (float * samples, float level, float clev, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = ((samples[i] + samples[i + 512]) * level +
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samples[i + 256] * clev + bias);
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}
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static void mix21to1 (float * samples, float level, float slev, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = ((samples[i] + samples[i + 256]) * level +
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samples[i + 512] * slev + bias);
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}
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static void mix31to1 (float * samples, float level, float clev, float slev,
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float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = ((samples[i] + samples[i + 512]) * level +
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samples[i + 256] * clev + samples[i + 768] * slev +
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bias);
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}
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static void mix22to1 (float * samples, float level, float slev, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = ((samples[i] + samples[i + 256]) * level +
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(samples[i + 512] + samples[i + 768]) * slev + bias);
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}
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static void mix32to1 (float * samples, float level, float clev, float slev,
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float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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samples[i] = ((samples[i] + samples[i + 512]) * level +
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samples[i + 256] * clev +
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(samples[i + 768] + samples[i + 1024]) * slev + bias);
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}
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static void mix1to2 (float * src, float * dest, float level, float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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dest[i] = src[i] = src[i] * level + bias;
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}
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static void mix3to2 (float * samples, float level, float clev, float bias)
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{
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int i;
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float common;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] * clev + bias;
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samples[i] = samples[i] * level + common;
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samples[i + 256] = samples[i + 512] * level + common;
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}
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}
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static void mix21to2 (float * left, float * right, float level, float slev,
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float bias)
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{
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int i;
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float common;
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for (i = 0; i < 256; i++) {
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common = right[i + 256] * slev + bias;
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left[i] = left[i] * level + common;
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right[i] = right[i] * level + common;
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}
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}
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static void mix11to1 (float * front, float * rear, float level, float slev,
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float bias)
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{
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int i;
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for (i = 0; i < 256; i++)
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front[i] = front[i] * level + rear[i] * slev + bias;
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}
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static void mix31to2 (float * samples, float level, float clev, float slev,
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float bias)
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{
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int i;
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float common;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] * clev + samples[i + 768] * slev + bias;
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samples[i] = samples[i] * level + common;
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samples[i + 256] = samples[i + 512] * level + common;
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}
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}
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static void mix32to2 (float * samples, float level, float clev, float slev,
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float bias)
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{
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int i;
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float common;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] * clev + bias;
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samples[i] = samples[i] * level + common + samples[i + 768] * slev;
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samples[i + 256] = (samples[i + 512] * level + common +
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samples[i + 1024] * slev);
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}
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}
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static void mix21toS (float * samples, float level, float level3db, float bias)
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{
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int i;
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float surround;
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for (i = 0; i < 256; i++) {
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surround = samples[i + 512] * level3db;
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samples[i] = samples[i] * level - surround + bias;
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samples[i + 256] = samples[i + 256] * level + surround + bias;
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}
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}
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static void mix22toS (float * samples, float level, float level3db, float bias)
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{
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int i;
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float surround;
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for (i = 0; i < 256; i++) {
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surround = (samples[i + 512] + samples[i + 768]) * level3db;
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samples[i] = samples[i] * level - surround + bias;
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samples[i + 256] = samples[i + 256] * level + surround + bias;
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}
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}
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static void mix31toS (float * samples, float level, float level3db, float bias)
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{
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int i;
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float common, surround;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] * level3db + bias;
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surround = samples[i + 768] * level3db;
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samples[i] = samples[i] * level + common - surround;
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samples[i + 256] = samples[i + 512] * level + common + surround;
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}
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}
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static void mix32toS (float * samples, float level, float level3db, float bias)
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{
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int i;
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float common, surround;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] * level3db + bias;
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surround = (samples[i + 768] + samples[i + 1024]) * level3db;
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samples[i] = samples[i] * level + common - surround;
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samples[i + 256] = samples[i + 512] * level + common + surround;
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}
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}
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void downmix (float * samples, int acmod, int output, float level, float bias,
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float clev, float slev)
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{
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switch (CONVERT (acmod, output & AC3_CHANNEL_MASK)) {
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case CONVERT (AC3_3F2R, AC3_3F2R):
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mix1to1 (samples + 1024, level, bias);
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case CONVERT (AC3_3F1R, AC3_3F1R):
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case CONVERT (AC3_2F2R, AC3_2F2R):
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mix1to1 (samples + 768, level, bias);
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case CONVERT (AC3_3F, AC3_3F):
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case CONVERT (AC3_2F1R, AC3_2F1R):
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mix_3to3:
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mix1to1 (samples + 512, level, bias);
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case CONVERT (AC3_CHANNEL, AC3_CHANNEL):
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case CONVERT (AC3_STEREO, AC3_STEREO):
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case CONVERT (AC3_STEREO, AC3_DOLBY):
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mix_2to2:
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mix1to1 (samples + 256, level, bias);
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case CONVERT (AC3_CHANNEL, AC3_CHANNEL1):
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case CONVERT (AC3_MONO, AC3_MONO):
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mix1to1 (samples, level, bias);
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break;
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case CONVERT (AC3_CHANNEL, AC3_CHANNEL2):
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mix_1to1_b:
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mix1to1 (samples + 256, level, bias);
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break;
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case CONVERT (AC3_STEREO, AC3_MONO):
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mix_2to1:
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mix2to1 (samples, level * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_2F1R, AC3_MONO):
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if (slev == 0)
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goto mix_2to1;
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mix21to1 (samples, level * LEVEL_3DB, level * slev * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_2F2R, AC3_MONO):
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if (slev == 0)
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goto mix_2to1;
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mix22to1 (samples, level * LEVEL_3DB, level * slev * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_3F, AC3_MONO):
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mix_3to1:
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mix3to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
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bias);
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break;
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case CONVERT (AC3_3F1R, AC3_MONO):
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if (slev == 0)
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goto mix_3to1;
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mix31to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
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level * slev * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_3F2R, AC3_MONO):
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if (slev == 0)
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goto mix_3to1;
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mix32to1 (samples, level * LEVEL_3DB, level * clev * LEVEL_PLUS3DB,
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level * slev * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_CHANNEL, AC3_MONO):
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mix2to1 (samples, level * LEVEL_6DB, bias);
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break;
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case CONVERT (AC3_MONO, AC3_DOLBY):
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mix1to2 (samples, samples + 256, level * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_3F, AC3_DOLBY):
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clev = LEVEL_3DB;
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case CONVERT (AC3_3F, AC3_STEREO):
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mix_3to2:
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mix3to2 (samples, level, level * clev, bias);
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break;
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case CONVERT (AC3_2F1R, AC3_DOLBY):
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mix21toS (samples, level, level * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_3F1R, AC3_DOLBY):
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mix31toS (samples, level, level * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_2F2R, AC3_DOLBY):
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mix22toS (samples, level, level * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_3F2R, AC3_DOLBY):
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mix32toS (samples, level, level * LEVEL_3DB, bias);
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break;
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case CONVERT (AC3_2F1R, AC3_STEREO):
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if (slev == 0)
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goto mix_2to2;
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mix21to2 (samples, samples + 256, level, level * slev * LEVEL_3DB,
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bias);
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break;
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case CONVERT (AC3_3F1R, AC3_STEREO):
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if (slev == 0)
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goto mix_3to2;
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mix31to2 (samples, level, level * clev, level * slev * LEVEL_3DB,
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bias);
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break;
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case CONVERT (AC3_2F2R, AC3_STEREO):
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if (slev == 0)
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goto mix_2to2;
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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);
|
|
goto mix_1to1_b;
|
|
|
|
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;
|
|
|
|
}
|
|
}
|