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651 lines
16 KiB
C
651 lines
16 KiB
C
/*
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* downmix.c
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* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
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* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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*
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* This file is part of a52dec, a free ATSC A-52 stream decoder.
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* See http://liba52.sourceforge.net/ for updates.
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*
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* a52dec 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 of the License, or
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* (at your option) any later version.
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*
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* a52dec 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "a52.h"
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#include "a52_internal.h"
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#define CONVERT(acmod,output) (((output) << 3) + (acmod))
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int a52_downmix_init (int input, int flags, sample_t * level,
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sample_t clev, sample_t slev)
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{
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static uint8_t table[11][8] = {
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
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A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO},
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{A52_MONO, A52_MONO, A52_MONO, A52_MONO,
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A52_MONO, A52_MONO, A52_MONO, A52_MONO},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
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A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
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A52_STEREO, A52_3F, A52_STEREO, A52_3F},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
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A52_2F1R, A52_2F1R, A52_2F1R, A52_2F1R},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
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A52_2F1R, A52_3F1R, A52_2F1R, A52_3F1R},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
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A52_2F2R, A52_2F2R, A52_2F2R, A52_2F2R},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
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A52_2F2R, A52_3F2R, A52_2F2R, A52_3F2R},
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{A52_CHANNEL1, A52_MONO, A52_MONO, A52_MONO,
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A52_MONO, A52_MONO, A52_MONO, A52_MONO},
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{A52_CHANNEL2, A52_MONO, A52_MONO, A52_MONO,
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A52_MONO, A52_MONO, A52_MONO, A52_MONO},
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{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_DOLBY,
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A52_DOLBY, A52_DOLBY, A52_DOLBY, A52_DOLBY}
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};
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int output;
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output = flags & A52_CHANNEL_MASK;
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if (output > A52_DOLBY)
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return -1;
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output = table[output][input & 7];
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if ((output == A52_STEREO) &&
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((input == A52_DOLBY) || ((input == A52_3F) && (clev == LEVEL_3DB))))
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output = A52_DOLBY;
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if (flags & A52_ADJUST_LEVEL)
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switch (CONVERT (input & 7, output)) {
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case CONVERT (A52_3F, A52_MONO):
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*level *= LEVEL_3DB / (1 + clev);
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break;
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case CONVERT (A52_STEREO, A52_MONO):
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case CONVERT (A52_2F2R, A52_2F1R):
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case CONVERT (A52_3F2R, A52_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 (A52_3F2R, A52_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 (A52_3F, A52_STEREO):
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case CONVERT (A52_3F1R, A52_2F1R):
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case CONVERT (A52_3F1R, A52_2F2R):
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case CONVERT (A52_3F2R, A52_2F2R):
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*level /= 1 + clev;
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break;
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case CONVERT (A52_2F1R, A52_MONO):
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*level *= LEVEL_PLUS3DB / (2 + slev);
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break;
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case CONVERT (A52_2F1R, A52_STEREO):
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case CONVERT (A52_3F1R, A52_3F):
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*level /= 1 + slev * LEVEL_3DB;
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break;
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case CONVERT (A52_3F1R, A52_MONO):
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*level *= LEVEL_3DB / (1 + clev + 0.5 * slev);
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break;
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case CONVERT (A52_3F1R, A52_STEREO):
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*level /= 1 + clev + slev * LEVEL_3DB;
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break;
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case CONVERT (A52_2F2R, A52_MONO):
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*level *= LEVEL_3DB / (1 + slev);
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break;
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case CONVERT (A52_2F2R, A52_STEREO):
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case CONVERT (A52_3F2R, A52_3F):
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*level /= 1 + slev;
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break;
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case CONVERT (A52_3F2R, A52_MONO):
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*level *= LEVEL_3DB / (1 + clev + slev);
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break;
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case CONVERT (A52_3F2R, A52_STEREO):
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*level /= 1 + clev + slev;
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break;
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case CONVERT (A52_MONO, A52_DOLBY):
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*level *= LEVEL_PLUS3DB;
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break;
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case CONVERT (A52_3F, A52_DOLBY):
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case CONVERT (A52_2F1R, A52_DOLBY):
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*level *= 1 / (1 + LEVEL_3DB);
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break;
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case CONVERT (A52_3F1R, A52_DOLBY):
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case CONVERT (A52_2F2R, A52_DOLBY):
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*level *= 1 / (1 + 2 * LEVEL_3DB);
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break;
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case CONVERT (A52_3F2R, A52_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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int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
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sample_t clev, sample_t slev)
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{
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switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
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case CONVERT (A52_CHANNEL, A52_CHANNEL):
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case CONVERT (A52_MONO, A52_MONO):
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case CONVERT (A52_STEREO, A52_STEREO):
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case CONVERT (A52_3F, A52_3F):
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case CONVERT (A52_2F1R, A52_2F1R):
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case CONVERT (A52_3F1R, A52_3F1R):
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case CONVERT (A52_2F2R, A52_2F2R):
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case CONVERT (A52_3F2R, A52_3F2R):
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case CONVERT (A52_STEREO, A52_DOLBY):
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coeff[0] = coeff[1] = coeff[2] = coeff[3] = coeff[4] = level;
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return 0;
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case CONVERT (A52_CHANNEL, A52_MONO):
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coeff[0] = coeff[1] = level * LEVEL_6DB;
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return 3;
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case CONVERT (A52_STEREO, A52_MONO):
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coeff[0] = coeff[1] = level * LEVEL_3DB;
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return 3;
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case CONVERT (A52_3F, A52_MONO):
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coeff[0] = coeff[2] = level * LEVEL_3DB;
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coeff[1] = level * clev * LEVEL_PLUS3DB;
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return 7;
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case CONVERT (A52_2F1R, A52_MONO):
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coeff[0] = coeff[1] = level * LEVEL_3DB;
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coeff[2] = level * slev * LEVEL_3DB;
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return 7;
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case CONVERT (A52_2F2R, A52_MONO):
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coeff[0] = coeff[1] = level * LEVEL_3DB;
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coeff[2] = coeff[3] = level * slev * LEVEL_3DB;
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return 15;
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case CONVERT (A52_3F1R, A52_MONO):
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coeff[0] = coeff[2] = level * LEVEL_3DB;
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coeff[1] = level * clev * LEVEL_PLUS3DB;
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coeff[3] = level * slev * LEVEL_3DB;
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return 15;
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case CONVERT (A52_3F2R, A52_MONO):
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coeff[0] = coeff[2] = level * LEVEL_3DB;
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coeff[1] = level * clev * LEVEL_PLUS3DB;
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coeff[3] = coeff[4] = level * slev * LEVEL_3DB;
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return 31;
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case CONVERT (A52_MONO, A52_DOLBY):
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coeff[0] = level * LEVEL_3DB;
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return 0;
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case CONVERT (A52_3F, A52_DOLBY):
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clev = LEVEL_3DB;
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case CONVERT (A52_3F, A52_STEREO):
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case CONVERT (A52_3F1R, A52_2F1R):
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case CONVERT (A52_3F2R, A52_2F2R):
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coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
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coeff[1] = level * clev;
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return 7;
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case CONVERT (A52_2F1R, A52_DOLBY):
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slev = 1;
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case CONVERT (A52_2F1R, A52_STEREO):
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coeff[0] = coeff[1] = level;
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coeff[2] = level * slev * LEVEL_3DB;
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return 7;
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case CONVERT (A52_3F1R, A52_DOLBY):
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clev = LEVEL_3DB;
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slev = 1;
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case CONVERT (A52_3F1R, A52_STEREO):
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coeff[0] = coeff[2] = level;
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coeff[1] = level * clev;
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coeff[3] = level * slev * LEVEL_3DB;
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return 15;
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case CONVERT (A52_2F2R, A52_DOLBY):
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slev = LEVEL_3DB;
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case CONVERT (A52_2F2R, A52_STEREO):
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coeff[0] = coeff[1] = level;
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coeff[2] = coeff[3] = level * slev;
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return 15;
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case CONVERT (A52_3F2R, A52_DOLBY):
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clev = LEVEL_3DB;
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case CONVERT (A52_3F2R, A52_2F1R):
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slev = LEVEL_3DB;
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case CONVERT (A52_3F2R, A52_STEREO):
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coeff[0] = coeff[2] = level;
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coeff[1] = level * clev;
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coeff[3] = coeff[4] = level * slev;
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return 31;
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case CONVERT (A52_3F1R, A52_3F):
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coeff[0] = coeff[1] = coeff[2] = level;
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coeff[3] = level * slev * LEVEL_3DB;
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return 13;
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case CONVERT (A52_3F2R, A52_3F):
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coeff[0] = coeff[1] = coeff[2] = level;
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coeff[3] = coeff[4] = level * slev;
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return 29;
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case CONVERT (A52_2F2R, A52_2F1R):
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coeff[0] = coeff[1] = level;
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coeff[2] = coeff[3] = level * LEVEL_3DB;
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return 12;
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case CONVERT (A52_3F2R, A52_3F1R):
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coeff[0] = coeff[1] = coeff[2] = level;
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coeff[3] = coeff[4] = level * LEVEL_3DB;
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return 24;
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case CONVERT (A52_2F1R, A52_2F2R):
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coeff[0] = coeff[1] = level;
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coeff[2] = level * LEVEL_3DB;
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return 0;
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case CONVERT (A52_3F1R, A52_2F2R):
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coeff[0] = coeff[2] = level;
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coeff[1] = level * clev;
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coeff[3] = level * LEVEL_3DB;
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return 7;
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case CONVERT (A52_3F1R, A52_3F2R):
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coeff[0] = coeff[1] = coeff[2] = level;
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coeff[3] = level * LEVEL_3DB;
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return 0;
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case CONVERT (A52_CHANNEL, A52_CHANNEL1):
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coeff[0] = level;
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coeff[1] = 0;
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return 0;
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case CONVERT (A52_CHANNEL, A52_CHANNEL2):
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coeff[0] = 0;
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coeff[1] = level;
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return 0;
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}
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return -1; /* NOTREACHED */
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}
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static void mix2to1 (sample_t * dest, sample_t * src, sample_t 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] + bias;
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}
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static void mix3to1 (sample_t * samples, sample_t 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 + 256] + samples[i + 512] + bias;
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}
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static void mix4to1 (sample_t * samples, sample_t 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 + 256] + samples[i + 512] +
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samples[i + 768] + bias);
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}
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static void mix5to1 (sample_t * samples, sample_t 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 + 256] + samples[i + 512] +
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samples[i + 768] + samples[i + 1024] + bias);
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}
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static void mix3to2 (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t common;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] + bias;
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samples[i] += common;
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samples[i + 256] = samples[i + 512] + common;
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}
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}
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static void mix21to2 (sample_t * left, sample_t * right, sample_t bias)
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{
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int i;
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sample_t common;
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for (i = 0; i < 256; i++) {
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common = right[i + 256] + bias;
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left[i] += common;
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right[i] += common;
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}
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}
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static void mix21toS (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t surround;
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for (i = 0; i < 256; i++) {
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surround = samples[i + 512];
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samples[i] += bias - surround;
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samples[i + 256] += bias + surround;
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}
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}
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static void mix31to2 (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t common;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] + samples[i + 768] + bias;
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samples[i] += common;
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samples[i + 256] = samples[i + 512] + common;
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}
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}
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static void mix31toS (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t common, surround;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] + bias;
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surround = samples[i + 768];
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samples[i] += common - surround;
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samples[i + 256] = samples[i + 512] + common + surround;
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}
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}
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static void mix22toS (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t surround;
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for (i = 0; i < 256; i++) {
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surround = samples[i + 512] + samples[i + 768];
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samples[i] += bias - surround;
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samples[i + 256] += bias + surround;
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}
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}
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static void mix32to2 (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t common;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] + bias;
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samples[i] += common + samples[i + 768];
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samples[i + 256] = common + samples[i + 512] + samples[i + 1024];
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}
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}
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static void mix32toS (sample_t * samples, sample_t bias)
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{
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int i;
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sample_t common, surround;
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for (i = 0; i < 256; i++) {
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common = samples[i + 256] + bias;
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surround = samples[i + 768] + samples[i + 1024];
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samples[i] += common - surround;
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samples[i + 256] = samples[i + 512] + common + surround;
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}
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}
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static void move2to1 (sample_t * src, sample_t * dest, sample_t 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] + bias;
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}
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static void zero (sample_t * samples)
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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] = 0;
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}
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void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
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sample_t clev, sample_t slev)
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{
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switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
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case CONVERT (A52_CHANNEL, A52_CHANNEL2):
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memcpy (samples, samples + 256, 256 * sizeof (sample_t));
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break;
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case CONVERT (A52_CHANNEL, A52_MONO):
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case CONVERT (A52_STEREO, A52_MONO):
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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 + 1027, 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;
|
|
}
|
|
}
|