lib/3rdparty/libmpg123/synth_8bit.c

   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 */
  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 synth_1to1_8bit
  26 #include "synth.h"
  27 #undef SYNTH_NAME
  28
  29 /* 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_mono2stereo
  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. */
  44 #undef NO_AUTOINCREMENT
  45 #endif
  46
  47 /* But now, we need functions that take the 16bit output of optimized 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       synth_1to1_8bit_wrap
  52 #define MONO_NAME        synth_1to1_8bit_wrap_mono
  53 #define MONO2STEREO_NAME synth_1to1_8bit_wrap_mono2stereo
  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 synth_2to1_8bit
  70 #include "synth.h"
  71 #undef SYNTH_NAME
  72
  73 /* Mono-related synths; they wrap over _some_ synth_2to1_8bit (could be generic, could be i386). */
  74 #define SYNTH_NAME       fr->synths.plain[r_2to1][f_8]
  75 #define MONO_NAME        synth_2to1_8bit_mono
  76 #define MONO2STEREO_NAME synth_2to1_8bit_mono2stereo
  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 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_mono2stereo
 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_mono2stereo
 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