Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
wine-mirror
GitHub Repository: wine-mirror/wine
 Path: blob/master/libs/mpg123/src/libmpg123/synth_8bit.c
4394 views
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 "../common/sample.h"

11
#include "../common/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 INT123_synth_1to1, we will need the postprocessing 8bit converters from synth_8bit.h .

17
*/

18


19
#define SAMPLE_T unsigned char

20
#define WRITE_SAMPLE(samples,sum,clip) WRITE_8BIT_SAMPLE(samples,sum,clip)

21


22
/* Part 2a: All straight 1to1 decoding functions */

23
#define BLOCK 0x40 /* One decoding block is 64 samples. */

24


25
#define SYNTH_NAME INT123_synth_1to1_8bit

26
#include "synth.h"

27
#undef SYNTH_NAME

28


29
/* Mono-related synths; they wrap over _some_ INT123_synth_1to1_8bit (could be generic, could be i386). */

30
#define SYNTH_NAME       fr->synths.plain[r_1to1][f_8]

31
#define MONO_NAME        INT123_synth_1to1_8bit_mono

32
#define MONO2STEREO_NAME INT123_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 INT123_synth_1to1_8bit_i386

41
#include "synth.h"

42
#undef SYNTH_NAME

43
/* i386 uses the normal mono functions. */

44
#undef NO_AUTOINCREMENT

45
#endif

46


47
/* But now, we need functions that take the 16bit output of optimized INT123_synth_1to1 and convert it.

48
   I suppose that is still faster than dropping the optimization altogether! */

49


50
#define BASE_SYNTH_NAME  fr->synths.plain[r_1to1][f_16]

51
#define SYNTH_NAME       INT123_synth_1to1_8bit_wrap

52
#define MONO_NAME        INT123_synth_1to1_8bit_wrap_mono

53
#define MONO2STEREO_NAME INT123_synth_1to1_8bit_wrap_m2s

54
#include "synth_8bit.h"

55
#undef BASE_SYNTH_NAME

56
#undef SYNTH_NAME

57
#undef MONO_NAME

58
#undef MONO2STEREO_NAME

59


60
#undef BLOCK

61


62
#ifndef NO_DOWNSAMPLE

63


64
/*

65
	Part 2b: 2to1 synth. Only generic and i386.

66
*/

67
#define BLOCK 0x20 /* One decoding block is 32 samples. */

68


69
#define SYNTH_NAME INT123_synth_2to1_8bit

70
#include "synth.h"

71
#undef SYNTH_NAME

72


73
/* Mono-related synths; they wrap over _some_ INT123_synth_2to1_8bit (could be generic, could be i386). */

74
#define SYNTH_NAME       fr->synths.plain[r_2to1][f_8]

75
#define MONO_NAME        INT123_synth_2to1_8bit_mono

76
#define MONO2STEREO_NAME INT123_synth_2to1_8bit_m2s

77
#include "synth_mono.h"

78
#undef SYNTH_NAME

79
#undef MONO_NAME

80
#undef MONO2STEREO_NAME

81


82
#ifdef OPT_X86

83
#define NO_AUTOINCREMENT

84
#define SYNTH_NAME INT123_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 INT123_synth_4to1_8bit

99
#include "synth.h"

100
#undef SYNTH_NAME

101


102
/* Mono-related synths; they wrap over _some_ INT123_synth_4to1_8bit (could be generic, could be i386). */

103
#define SYNTH_NAME       fr->synths.plain[r_4to1][f_8]

104
#define MONO_NAME        INT123_synth_4to1_8bit_mono

105
#define MONO2STEREO_NAME INT123_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 INT123_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 INT123_dct64.

128
*/

129


130
/* These are all in one header, there's no flexibility to gain. */

131
#define SYNTH_NAME       INT123_synth_ntom_8bit

132
#define MONO_NAME        INT123_synth_ntom_8bit_mono

133
#define MONO2STEREO_NAME INT123_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

143


144