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261
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1 #include <stdio.h>
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2 #include <string.h>
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3 #include <signal.h>
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4
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5 #ifndef WIN32
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6 #include <sys/signal.h>
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7 #include <unistd.h>
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8 #endif
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9
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10 #include <math.h>
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11
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12 #ifdef _WIN32
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13 # undef WIN32
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14 # define WIN32
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15
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16 # define M_PI 3.14159265358979323846
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17 # define M_SQRT2 1.41421356237309504880
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18 # define REAL_IS_FLOAT
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19 # define NEW_DCT9
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20
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21 # define random rand
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22 # define srandom srand
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23
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24 #endif
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25
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26 #ifdef REAL_IS_FLOAT
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27 # define real float
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28 #elif defined(REAL_IS_LONG_DOUBLE)
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29 # define real long double
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30 #else
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31 # define real double
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32 #endif
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33
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34 #ifdef __GNUC__
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35 #define INLINE inline
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36 #else
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37 #define INLINE
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38 #endif
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39
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40 /* AUDIOBUFSIZE = n*64 with n=1,2,3 ... */
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41 #define AUDIOBUFSIZE 16384
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42
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43 #ifndef FALSE
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44 #define FALSE 0
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45 #endif
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46 #ifndef FALSE
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47 #define TRUE 1
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48 #endif
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49
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50 #define SBLIMIT 32
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51 #define SSLIMIT 18
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52
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53 #define SCALE_BLOCK 12
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54
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55
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56 #define MPG_MD_STEREO 0
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57 #define MPG_MD_JOINT_STEREO 1
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58 #define MPG_MD_DUAL_CHANNEL 2
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59 #define MPG_MD_MONO 3
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60
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61 #define MAXFRAMESIZE 1792
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62
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63
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64 /* Pre Shift fo 16 to 8 bit converter table */
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65 #define AUSHIFT (3)
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66
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67 struct frame {
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68 int stereo;
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69 int jsbound;
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70 int single;
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71 int lsf;
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72 int mpeg25;
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73 int header_change;
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74 int lay;
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75 int error_protection;
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76 int bitrate_index;
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77 int sampling_frequency;
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78 int padding;
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79 int extension;
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80 int mode;
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81 int mode_ext;
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82 int copyright;
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83 int original;
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84 int emphasis;
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85 int framesize; /* computed framesize */
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86
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87 /* layer2 stuff */
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88 int II_sblimit;
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89 void *alloc;
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90 };
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91
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92 struct parameter {
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93 int quiet; /* shut up! */
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94 int tryresync; /* resync stream after error */
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95 int verbose; /* verbose level */
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96 int checkrange;
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97 };
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98
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99 extern unsigned int get1bit(void);
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100 extern unsigned int getbits(int);
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101 extern unsigned int getbits_fast(int);
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102 extern int set_pointer(long);
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103
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104 extern unsigned char *wordpointer;
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105 extern int bitindex;
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106
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107 extern void make_decode_tables(long scaleval);
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108 extern int do_layer3(struct frame *fr,unsigned char *,int *);
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109 extern int do_layer2(struct frame *fr,unsigned char *,int *);
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110 extern int do_layer1(struct frame *fr,unsigned char *,int *);
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111 extern int decode_header(struct frame *fr,unsigned long newhead);
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112
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113
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114
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115 struct gr_info_s {
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116 int scfsi;
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117 unsigned part2_3_length;
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118 unsigned big_values;
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119 unsigned scalefac_compress;
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120 unsigned block_type;
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121 unsigned mixed_block_flag;
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122 unsigned table_select[3];
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123 unsigned subblock_gain[3];
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124 unsigned maxband[3];
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125 unsigned maxbandl;
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126 unsigned maxb;
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127 unsigned region1start;
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128 unsigned region2start;
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129 unsigned preflag;
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130 unsigned scalefac_scale;
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131 unsigned count1table_select;
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132 real *full_gain[3];
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133 real *pow2gain;
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134 };
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135
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136 struct III_sideinfo
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137 {
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138 unsigned main_data_begin;
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139 unsigned private_bits;
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140 struct {
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141 struct gr_info_s gr[2];
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142 } ch[2];
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143 };
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144
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145 extern int synth_1to1 (real *,int,unsigned char *,int *);
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146 extern int synth_1to1_8bit (real *,int,unsigned char *,int *);
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147 extern int synth_1to1_mono (real *,unsigned char *,int *);
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148 extern int synth_1to1_mono2stereo (real *,unsigned char *,int *);
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149 extern int synth_1to1_8bit_mono (real *,unsigned char *,int *);
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150 extern int synth_1to1_8bit_mono2stereo (real *,unsigned char *,int *);
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151
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152 extern int synth_2to1 (real *,int,unsigned char *,int *);
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153 extern int synth_2to1_8bit (real *,int,unsigned char *,int *);
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154 extern int synth_2to1_mono (real *,unsigned char *,int *);
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155 extern int synth_2to1_mono2stereo (real *,unsigned char *,int *);
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156 extern int synth_2to1_8bit_mono (real *,unsigned char *,int *);
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157 extern int synth_2to1_8bit_mono2stereo (real *,unsigned char *,int *);
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158
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159 extern int synth_4to1 (real *,int,unsigned char *,int *);
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160 extern int synth_4to1_8bit (real *,int,unsigned char *,int *);
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161 extern int synth_4to1_mono (real *,unsigned char *,int *);
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162 extern int synth_4to1_mono2stereo (real *,unsigned char *,int *);
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163 extern int synth_4to1_8bit_mono (real *,unsigned char *,int *);
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164 extern int synth_4to1_8bit_mono2stereo (real *,unsigned char *,int *);
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165
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166 extern int synth_ntom (real *,int,unsigned char *,int *);
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167 extern int synth_ntom_8bit (real *,int,unsigned char *,int *);
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168 extern int synth_ntom_mono (real *,unsigned char *,int *);
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169 extern int synth_ntom_mono2stereo (real *,unsigned char *,int *);
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170 extern int synth_ntom_8bit_mono (real *,unsigned char *,int *);
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171 extern int synth_ntom_8bit_mono2stereo (real *,unsigned char *,int *);
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172
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173 extern void rewindNbits(int bits);
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174 extern int hsstell(void);
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175 extern int get_songlen(struct frame *fr,int no);
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176
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177 extern void init_layer3(int);
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178 extern void init_layer2(void);
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179 extern void make_decode_tables(long scale);
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180 extern void make_conv16to8_table(int);
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181 extern void dct64(real *,real *,real *);
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182
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183 extern void synth_ntom_set_step(long,long);
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184
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185 extern unsigned char *conv16to8;
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186 extern long freqs[9];
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187 extern real muls[27][64];
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188 extern real decwin[512+32];
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189 extern real *pnts[5];
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190
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191 extern struct parameter param;
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192
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193
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