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Examples
synth_8bit.c
Go to the documentation of this file.
1
/*
2
synth_8bit.c: The functions for synthesizing 8bit samples, at the end of decoding.
3
4
copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
5
see COPYING and AUTHORS files in distribution or http://mpg123.org
6
initially written by Michael Hipp, heavily dissected and rearranged by Thomas Orgis
7
*/
8
9
#include "
mpg123lib_intern.h
"
10
#include "
sample.h
"
11
#include "debug.h"
12
13
/*
14
Part 2: All synth functions that produce 8bit output.
15
What we need is just a special WRITE_SAMPLE. For the generic and i386 functions, that is.
16
For the rather optimized synth_1to1, we will need the postprocessing 8bit converters from synth_8bit.h .
17
*/
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#define SAMPLE_T unsigned char
20
#define WRITE_SAMPLE(samples,sum,clip) WRITE_8BIT_SAMPLE(samples,sum,clip)
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/* Part 2a: All straight 1to1 decoding functions */
23
#define BLOCK 0x40
/* One decoding block is 64 samples. */
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#define SYNTH_NAME synth_1to1_8bit
26
#include "
synth.h
"
27
#undef SYNTH_NAME
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/* Mono-related synths; they wrap over _some_ synth_1to1_8bit (could be generic, could be i386). */
30
#define SYNTH_NAME fr->synths.plain[r_1to1][f_8]
31
#define MONO_NAME synth_1to1_8bit_mono
32
#define MONO2STEREO_NAME synth_1to1_8bit_m2s
33
#include "
synth_mono.h
"
34
#undef SYNTH_NAME
35
#undef MONO_NAME
36
#undef MONO2STEREO_NAME
37
38
#ifdef OPT_X86
39
#define NO_AUTOINCREMENT
40
#define SYNTH_NAME synth_1to1_8bit_i386
41
#include "
synth.h
"
42
#undef SYNTH_NAME
43
/* i386 uses the normal mono functions. */
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#undef NO_AUTOINCREMENT
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#endif
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/* But now, we need functions that take the 16bit output of optimized synth_1to1 and convert it.
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I suppose that is still faster than dropping the optimization altogether! */
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#define BASE_SYNTH_NAME fr->synths.plain[r_1to1][f_16]
51
#define SYNTH_NAME synth_1to1_8bit_wrap
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#define MONO_NAME synth_1to1_8bit_wrap_mono
53
#define MONO2STEREO_NAME synth_1to1_8bit_wrap_m2s
54
#include "
synth_8bit.h
"
55
#undef BASE_SYNTH_NAME
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#undef SYNTH_NAME
57
#undef MONO_NAME
58
#undef MONO2STEREO_NAME
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#undef BLOCK
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#ifndef NO_DOWNSAMPLE
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/*
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Part 2b: 2to1 synth. Only generic and i386.
66
*/
67
#define BLOCK 0x20
/* One decoding block is 32 samples. */
68
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#define SYNTH_NAME synth_2to1_8bit
70
#include "
synth.h
"
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#undef SYNTH_NAME
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/* Mono-related synths; they wrap over _some_ synth_2to1_8bit (could be generic, could be i386). */
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#define SYNTH_NAME fr->synths.plain[r_2to1][f_8]
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#define MONO_NAME synth_2to1_8bit_mono
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#define MONO2STEREO_NAME synth_2to1_8bit_m2s
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#include "
synth_mono.h
"
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#undef SYNTH_NAME
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#undef MONO_NAME
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#undef MONO2STEREO_NAME
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#ifdef OPT_X86
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#define NO_AUTOINCREMENT
84
#define SYNTH_NAME synth_2to1_8bit_i386
85
#include "
synth.h
"
86
#undef SYNTH_NAME
87
/* i386 uses the normal mono functions. */
88
#undef NO_AUTOINCREMENT
89
#endif
90
91
#undef BLOCK
92
93
/*
94
Part 2c: 4to1 synth. Only generic and i386.
95
*/
96
#define BLOCK 0x10
/* One decoding block is 16 samples. */
97
98
#define SYNTH_NAME synth_4to1_8bit
99
#include "
synth.h
"
100
#undef SYNTH_NAME
101
102
/* Mono-related synths; they wrap over _some_ synth_4to1_8bit (could be generic, could be i386). */
103
#define SYNTH_NAME fr->synths.plain[r_4to1][f_8]
104
#define MONO_NAME synth_4to1_8bit_mono
105
#define MONO2STEREO_NAME synth_4to1_8bit_m2s
106
#include "
synth_mono.h
"
107
#undef SYNTH_NAME
108
#undef MONO_NAME
109
#undef MONO2STEREO_NAME
110
111
#ifdef OPT_X86
112
#define NO_AUTOINCREMENT
113
#define SYNTH_NAME synth_4to1_8bit_i386
114
#include "
synth.h
"
115
#undef SYNTH_NAME
116
/* i386 uses the normal mono functions. */
117
#undef NO_AUTOINCREMENT
118
#endif
119
120
#undef BLOCK
121
122
#endif
/* NO_DOWNSAMPLE */
123
124
#ifndef NO_NTOM
125
/*
126
Part 2d: ntom synth.
127
Same procedure as above... Just no extra play anymore, straight synth that may use an optimized dct64.
128
*/
129
130
/* These are all in one header, there's no flexibility to gain. */
131
#define SYNTH_NAME synth_ntom_8bit
132
#define MONO_NAME synth_ntom_8bit_mono
133
#define MONO2STEREO_NAME synth_ntom_8bit_m2s
134
#include "
synth_ntom.h
"
135
#undef SYNTH_NAME
136
#undef MONO_NAME
137
#undef MONO2STEREO_NAME
138
139
#endif
140
141
#undef SAMPLE_T
142
#undef WRITE_SAMPLE
mpg123lib_intern.h
sample.h
synth.h
synth_8bit.h
synth_mono.h
synth_ntom.h
sdk
lib
3rdparty
libmpg123
synth_8bit.c
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