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authorKlaus Schmidinger <kls (at) cadsoft (dot) de>2001-08-12 18:00:00 +0200
committerKlaus Schmidinger <kls (at) cadsoft (dot) de>2001-08-12 18:00:00 +0200
commitefea0f64d08052b0189d962101e1a3634d4adfc8 (patch)
treea3feff7ccf6874da549b25ea3b671d15a65d0e3d /ac3dec/downmix_c.c
parentf1d1c9849c8e27cccb46cf9c0d0ccb59da3f91f9 (diff)
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Version 0.91vdr-0.91
- Fixed displaying colored button texts that are too long. - Suppressing replay progress display when replaying a DVD. - Updated channels.conf.cable (thanks to Uwe Scheffler). - Updated French OSD texts (thanks to Jean-Claude Repetto). - Improved AC3 decoding when replaying DVDs (thanks to Matjaz Thaler). - Fixed handling DVB card indexes when using only one card in a multi-card system. - Changed the 'Eject DVD' button text to a simple 'Eject' (the German text was too long...). - Made the font file generation more stable (thanks to Artur Skawina). - Changed the default value for the "DiSEqC" setup parameter to "off". - The new command line option '-E' can be used to define where the EPG data shall be written to. This is especially useful if VDR runs in a system that turns off the video disk when it is not used, and therefore needs to write the EPG file to a ramdisk (or turn off writing it alltogether). See 'vdr --help' for details. - Making sure the disk is up and running before starting recording (this is important for systems that turn off the video disk when it is not used). - Added the "Jump" function in replay mode (thanks to Stefan Huelswitt). See the description of the "Red" key in MANUAL under "Replay Control" for details. - Fixed displaying editing marks when toggling a mark in "pause" mode. - If there is no free DVB device to record, the log message will now be given only once. - Made I/O more robust by handling EINTR (thanks to Werner Fink).
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;
+ }
+}