--- /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