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00001 /*
00002     synth_8bit.c: The functions for synthesizing 8bit samples, at the end of decoding.
00003 
00004     copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
00005     see COPYING and AUTHORS files in distribution or http://mpg123.org
00006     initially written by Michael Hipp, heavily dissected and rearranged by Thomas Orgis
00007 */
00008 
00009 #include "mpg123lib_intern.h"
00010 #include "sample.h"
00011 #include "debug.h"
00012 
00013 /* 
00014     Part 2: All synth functions that produce 8bit output.
00015     What we need is just a special WRITE_SAMPLE. For the generic and i386 functions, that is.
00016     For the rather optimized synth_1to1, we will need the postprocessing 8bit converters from synth_8bit.h .
00017 */
00018 
00019 #define SAMPLE_T unsigned char
00020 #define WRITE_SAMPLE(samples,sum,clip) WRITE_8BIT_SAMPLE(samples,sum,clip)
00021 
00022 /* Part 2a: All straight 1to1 decoding functions */
00023 #define BLOCK 0x40 /* One decoding block is 64 samples. */
00024 
00025 #define SYNTH_NAME synth_1to1_8bit
00026 #include "synth.h"
00027 #undef SYNTH_NAME
00028 
00029 /* Mono-related synths; they wrap over _some_ synth_1to1_8bit (could be generic, could be i386). */
00030 #define SYNTH_NAME       fr->synths.plain[r_1to1][f_8]
00031 #define MONO_NAME        synth_1to1_8bit_mono
00032 #define MONO2STEREO_NAME synth_1to1_8bit_mono2stereo
00033 #include "synth_mono.h"
00034 #undef SYNTH_NAME
00035 #undef MONO_NAME
00036 #undef MONO2STEREO_NAME
00037 
00038 #ifdef OPT_X86
00039 #define NO_AUTOINCREMENT
00040 #define SYNTH_NAME synth_1to1_8bit_i386
00041 #include "synth.h"
00042 #undef SYNTH_NAME
00043 /* i386 uses the normal mono functions. */
00044 #undef NO_AUTOINCREMENT
00045 #endif
00046 
00047 /* But now, we need functions that take the 16bit output of optimized synth_1to1 and convert it.
00048    I suppose that is still faster than dropping the optimization altogether! */
00049 
00050 #define BASE_SYNTH_NAME  fr->synths.plain[r_1to1][f_16]
00051 #define SYNTH_NAME       synth_1to1_8bit_wrap
00052 #define MONO_NAME        synth_1to1_8bit_wrap_mono
00053 #define MONO2STEREO_NAME synth_1to1_8bit_wrap_mono2stereo
00054 #include "synth_8bit.h"
00055 #undef BASE_SYNTH_NAME
00056 #undef SYNTH_NAME
00057 #undef MONO_NAME
00058 #undef MONO2STEREO_NAME
00059 
00060 #undef BLOCK
00061 
00062 #ifndef NO_DOWNSAMPLE
00063 
00064 /*
00065     Part 2b: 2to1 synth. Only generic and i386.
00066 */
00067 #define BLOCK 0x20 /* One decoding block is 32 samples. */
00068 
00069 #define SYNTH_NAME synth_2to1_8bit
00070 #include "synth.h"
00071 #undef SYNTH_NAME
00072 
00073 /* Mono-related synths; they wrap over _some_ synth_2to1_8bit (could be generic, could be i386). */
00074 #define SYNTH_NAME       fr->synths.plain[r_2to1][f_8]
00075 #define MONO_NAME        synth_2to1_8bit_mono
00076 #define MONO2STEREO_NAME synth_2to1_8bit_mono2stereo
00077 #include "synth_mono.h"
00078 #undef SYNTH_NAME
00079 #undef MONO_NAME
00080 #undef MONO2STEREO_NAME
00081 
00082 #ifdef OPT_X86
00083 #define NO_AUTOINCREMENT
00084 #define SYNTH_NAME synth_2to1_8bit_i386
00085 #include "synth.h"
00086 #undef SYNTH_NAME
00087 /* i386 uses the normal mono functions. */
00088 #undef NO_AUTOINCREMENT
00089 #endif
00090 
00091 #undef BLOCK
00092 
00093 /*
00094     Part 2c: 4to1 synth. Only generic and i386.
00095 */
00096 #define BLOCK 0x10 /* One decoding block is 16 samples. */
00097 
00098 #define SYNTH_NAME synth_4to1_8bit
00099 #include "synth.h"
00100 #undef SYNTH_NAME
00101 
00102 /* Mono-related synths; they wrap over _some_ synth_4to1_8bit (could be generic, could be i386). */
00103 #define SYNTH_NAME       fr->synths.plain[r_4to1][f_8]
00104 #define MONO_NAME        synth_4to1_8bit_mono
00105 #define MONO2STEREO_NAME synth_4to1_8bit_mono2stereo
00106 #include "synth_mono.h"
00107 #undef SYNTH_NAME
00108 #undef MONO_NAME
00109 #undef MONO2STEREO_NAME
00110 
00111 #ifdef OPT_X86
00112 #define NO_AUTOINCREMENT
00113 #define SYNTH_NAME synth_4to1_8bit_i386
00114 #include "synth.h"
00115 #undef SYNTH_NAME
00116 /* i386 uses the normal mono functions. */
00117 #undef NO_AUTOINCREMENT
00118 #endif
00119 
00120 #undef BLOCK
00121 
00122 #endif /* NO_DOWNSAMPLE */
00123 
00124 #ifndef NO_NTOM
00125 /*
00126     Part 2d: ntom synth.
00127     Same procedure as above... Just no extra play anymore, straight synth that may use an optimized dct64.
00128 */
00129 
00130 /* These are all in one header, there's no flexibility to gain. */
00131 #define SYNTH_NAME       synth_ntom_8bit
00132 #define MONO_NAME        synth_ntom_8bit_mono
00133 #define MONO2STEREO_NAME synth_ntom_8bit_mono2stereo
00134 #include "synth_ntom.h"
00135 #undef SYNTH_NAME
00136 #undef MONO_NAME
00137 #undef MONO2STEREO_NAME
00138 
00139 #endif
00140 
00141 #undef SAMPLE_T
00142 #undef WRITE_SAMPLE
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