3 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
6 * This file is part of a52dec, a free ATSC A-52 stream decoder.
7 * See http://liba52.sourceforge.net/ for updates.
9 * a52dec is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * a52dec is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include "audio_out.h"
31 static inline int16_t convert (int32_t i)
35 else if (i < 0x43bf8000)
38 return i - 0x43c00000;
41 void float2s16_2 (float * _f, int16_t * s16)
44 int32_t * f = (int32_t *) _f;
46 for (i = 0; i < 256; i++) {
47 s16[2*i] = convert (f[i]);
48 s16[2*i+1] = convert (f[i+256]);
52 void float2s16_4 (float * _f, int16_t * s16)
55 int32_t * f = (int32_t *) _f;
57 for (i = 0; i < 256; i++) {
58 s16[4*i] = convert (f[i]);
59 s16[4*i+1] = convert (f[i+256]);
60 s16[4*i+2] = convert (f[i+512]);
61 s16[4*i+3] = convert (f[i+768]);
65 void float2s16_5 (float * _f, int16_t * s16)
68 int32_t * f = (int32_t *) _f;
70 for (i = 0; i < 256; i++) {
71 s16[5*i] = convert (f[i]);
72 s16[5*i+1] = convert (f[i+256]);
73 s16[5*i+2] = convert (f[i+512]);
74 s16[5*i+3] = convert (f[i+768]);
75 s16[5*i+4] = convert (f[i+1024]);
79 int channels_multi (int flags)
83 else if (flags & 1) /* center channel */
85 else if ((flags & A52_CHANNEL_MASK) == A52_2F2R)
91 void float2s16_multi (float * _f, int16_t * s16, int flags)
94 int32_t * f = (int32_t *) _f;
98 for (i = 0; i < 256; i++) {
99 s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
100 s16[5*i+4] = convert (f[i]);
106 float2s16_2 (_f, s16);
109 for (i = 0; i < 256; i++) {
110 s16[5*i] = convert (f[i]);
111 s16[5*i+1] = convert (f[i+512]);
112 s16[5*i+2] = s16[5*i+3] = 0;
113 s16[5*i+4] = convert (f[i+256]);
117 float2s16_4 (_f, s16);
120 float2s16_5 (_f, s16);
122 case A52_MONO | A52_LFE:
123 for (i = 0; i < 256; i++) {
124 s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
125 s16[6*i+4] = convert (f[i+256]);
126 s16[6*i+5] = convert (f[i]);
129 case A52_CHANNEL | A52_LFE:
130 case A52_STEREO | A52_LFE:
131 case A52_DOLBY | A52_LFE:
132 for (i = 0; i < 256; i++) {
133 s16[6*i] = convert (f[i+256]);
134 s16[6*i+1] = convert (f[i+512]);
135 s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
136 s16[6*i+5] = convert (f[i]);
139 case A52_3F | A52_LFE:
140 for (i = 0; i < 256; i++) {
141 s16[6*i] = convert (f[i+256]);
142 s16[6*i+1] = convert (f[i+768]);
143 s16[6*i+2] = s16[6*i+3] = 0;
144 s16[6*i+4] = convert (f[i+512]);
145 s16[6*i+5] = convert (f[i]);
148 case A52_2F2R | A52_LFE:
149 for (i = 0; i < 256; i++) {
150 s16[6*i] = convert (f[i+256]);
151 s16[6*i+1] = convert (f[i+512]);
152 s16[6*i+2] = convert (f[i+768]);
153 s16[6*i+3] = convert (f[i+1024]);
155 s16[6*i+5] = convert (f[i]);
158 case A52_3F2R | A52_LFE:
159 for (i = 0; i < 256; i++) {
160 s16[6*i] = convert (f[i+256]);
161 s16[6*i+1] = convert (f[i+768]);
162 s16[6*i+2] = convert (f[i+1024]);
163 s16[6*i+3] = convert (f[i+1280]);
164 s16[6*i+4] = convert (f[i+512]);
165 s16[6*i+5] = convert (f[i]);
171 void s16_swap (int16_t * s16, int channels)
174 uint16_t * u16 = (uint16_t *) s16;
176 for (i = 0; i < 256 * channels; i++)
177 u16[i] = (u16[i] >> 8) | (u16[i] << 8);