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authorKlaus Schmidinger <vdr@tvdr.de>2001-08-09 11:41:39 +0200
committerKlaus Schmidinger <vdr@tvdr.de>2001-08-09 11:41:39 +0200
commitc50dc5e888627bd1644f46585a44dc118c865127 (patch)
tree1dc5a28da106e3404863fc0234891142a5c29b2f /ac3dec/downmix_c.c
parent85a027791063dfd7e94ccef45ea9e755df63d29a (diff)
downloadvdr-c50dc5e888627bd1644f46585a44dc118c865127.tar.gz
vdr-c50dc5e888627bd1644f46585a44dc118c865127.tar.bz2
Improvements from Matjaz Thaler
Diffstat (limited to 'ac3dec/downmix_c.c')
-rw-r--r--ac3dec/downmix_c.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/ac3dec/downmix_c.c b/ac3dec/downmix_c.c
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+/*
+ * downmix_c.c
+ *
+ * Copyright (C) Aaron Holtzman - May 1999
+ *
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "ac3.h"
+#include "ac3_internal.h"
+
+#include "debug.h"
+#include "downmix.h"
+#include "downmix_c.h"
+
+
+void downmix_3f_2r_to_2ch_c (float *samples, dm_par_t *dm_par)
+{
+ int i;
+ float *left, *right, *center, *left_sur, *right_sur;
+ float left_tmp, right_tmp;
+
+ left = samples;
+ right = samples + 256 * 2;
+ center = samples + 256;
+ left_sur = samples + 256 * 3;
+ right_sur = samples + 256 * 4;
+
+ for (i=0; i < 256; i++) {
+#if defined DOLBY_SURROUND
+ left_tmp = dm_par->unit * *left + dm_par->clev * *center - dm_par->slev * (*left_sur + *right_sur);
+ right_tmp= dm_par->unit * *right++ + dm_par->clev * *center + dm_par->slev * (*left_sur++ + *right_sur++);
+#else
+ left_tmp = dm_par->unit * *left + dm_par->clev * *center + dm_par->slev * *left_sur++;
+ right_tmp= dm_par->unit * *right++ + dm_par->clev * *center + dm_par->slev * *right_sur++;
+#endif
+ *left++ = left_tmp;
+ *center++ = right_tmp;
+
+ }
+}
+
+
+void downmix_2f_2r_to_2ch_c (float *samples, dm_par_t *dm_par)
+{
+ int i;
+ float *left, *right, *left_sur, *right_sur;
+ float left_tmp, right_tmp;
+
+ left = &samples[0];
+ right = &samples[256];
+ left_sur = &samples[512];
+ right_sur = &samples[768];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = dm_par->unit * *left + dm_par->slev * *left_sur++;
+ right_tmp= dm_par->unit * *right + dm_par->slev * *right_sur++;
+ *left++ = left_tmp;
+ *right++ = right_tmp;
+ }
+}
+
+
+void downmix_3f_1r_to_2ch_c (float *samples, dm_par_t *dm_par)
+{
+ int i;
+ float *left, *right, *center, *right_sur;
+ float left_tmp, right_tmp;
+
+ left = &samples[0];
+ right = &samples[512];
+ center = &samples[256];
+ right_sur = &samples[768];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = dm_par->unit * *left + dm_par->clev * *center - dm_par->slev * *right_sur;
+ right_tmp= dm_par->unit * *right++ + dm_par->clev * *center + dm_par->slev * *right_sur++;
+ *left++ = left_tmp;
+ *center++ = right_tmp;
+ }
+}
+
+
+void downmix_2f_1r_to_2ch_c (float *samples, dm_par_t *dm_par)
+{
+ int i;
+ float *left, *right, *right_sur;
+ float left_tmp, right_tmp;
+
+ left = &samples[0];
+ right = &samples[256];
+ right_sur = &samples[512];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = dm_par->unit * *left - dm_par->slev * *right_sur;
+ right_tmp= dm_par->unit * *right + dm_par->slev * *right_sur++;
+ *left++ = left_tmp;
+ *right++ = right_tmp;
+ }
+}
+
+
+void downmix_3f_0r_to_2ch_c (float *samples, dm_par_t *dm_par)
+{
+ int i;
+ float *left, *right, *center;
+ float left_tmp, right_tmp;
+
+ left = &samples[0];
+ center = &samples[256];
+ right = &samples[512];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = dm_par->unit * *left + dm_par->clev * *center;
+ right_tmp= dm_par->unit * *right++ + dm_par->clev * *center;
+ *left++ = left_tmp;
+ *center++ = right_tmp;
+ }
+}
+
+
+void stream_sample_2ch_to_s16_c (int16_t *s16_samples, float *left, float *right)
+{
+ int i;
+
+ for (i=0; i < 256; i++) {
+ *s16_samples++ = (int16_t) *left++;
+ *s16_samples++ = (int16_t) *right++;
+ }
+}
+
+
+void stream_sample_1ch_to_s16_c (int16_t *s16_samples, float *center)
+{
+ int i;
+ float tmp;
+
+ for (i=0; i < 256; i++) {
+ *s16_samples++ = tmp = (int16_t) (0.7071f * *center++);
+ *s16_samples++ = tmp;
+ }
+}