annotate decoders/mpglib/mpglib_common.c @ 549:394e3ec86164 stable-1.0 release-1.0.3

Upped version to 1.0.3.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 20 Apr 2008 20:36:59 +0000
parents fb519e6028e3
children c66080364dff
rev   line source
377
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1
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2 #if HAVE_CONFIG_H
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3 # include <config.h>
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4 #endif
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5
298
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6 #include <ctype.h>
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7 #include <stdlib.h>
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8
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9 #include "SDL_sound.h"
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10
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11 #define __SDL_SOUND_INTERNAL__
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12 #include "SDL_sound_internal.h"
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13
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14 #include "mpg123_sdlsound.h"
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15
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16 struct parameter param = { 1 , 1 , 0 , 0 };
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17
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18 int tabsel_123[2][3][16] = {
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19 { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
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20 {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
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21 {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
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22
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23 { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
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24 {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
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25 {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
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26 };
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27
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28 long mpglib_freqs[9] = { 44100, 48000, 32000,
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29 22050, 24000, 16000 ,
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30 11025 , 12000 , 8000 };
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31
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32 int bitindex;
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33 unsigned char *wordpointer;
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34 unsigned char *pcm_sample;
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35 int pcm_point = 0;
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36
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37
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38 #define HDRCMPMASK 0xfffffd00
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39
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40 #if 0
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41 int head_check(unsigned long head)
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42 {
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43 if( (head & 0xffe00000) != 0xffe00000)
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44 return FALSE;
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45 if(!((head>>17)&3))
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46 return FALSE;
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47 if( ((head>>12)&0xf) == 0xf)
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48 return FALSE;
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49 if( ((head>>10)&0x3) == 0x3 )
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50 return FALSE;
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51 return TRUE;
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52 }
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53 #endif
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54
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55
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56 /*
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57 * the code a header and write the information
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58 * into the frame structure
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59 */
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60 int decode_header(struct frame *fr,unsigned long newhead)
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61 {
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62 if( newhead & (1<<20) ) {
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63 fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1;
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64 fr->mpeg25 = 0;
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65 }
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66 else {
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67 fr->lsf = 1;
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68 fr->mpeg25 = 1;
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69 }
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70
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71 fr->lay = 4-((newhead>>17)&3);
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72 if( ((newhead>>10)&0x3) == 0x3) {
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73 BAIL_MACRO("MPGLIB: Corrupted header", 0);
298
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74 }
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75 if(fr->mpeg25) {
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76 fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
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77 }
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78 else
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79 fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3);
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80 fr->error_protection = ((newhead>>16)&0x1)^0x1;
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81
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82 if(fr->mpeg25) /* allow Bitrate change for 2.5 ... */
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83 fr->bitrate_index = ((newhead>>12)&0xf);
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84
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85 fr->bitrate_index = ((newhead>>12)&0xf);
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86 fr->padding = ((newhead>>9)&0x1);
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87 fr->extension = ((newhead>>8)&0x1);
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88 fr->mode = ((newhead>>6)&0x3);
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89 fr->mode_ext = ((newhead>>4)&0x3);
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90 fr->copyright = ((newhead>>3)&0x1);
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91 fr->original = ((newhead>>2)&0x1);
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92 fr->emphasis = newhead & 0x3;
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93
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94 fr->stereo = (fr->mode == MPG_MD_MONO) ? 1 : 2;
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95
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96 if(!fr->bitrate_index)
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97 {
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98 BAIL_MACRO("MPGLIB: Free format not supported.", 0);
298
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99 }
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100
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101 switch(fr->lay)
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102 {
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103 case 1:
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104 #ifdef LAYER1
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105 #if 0
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106 fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
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107 (fr->mode_ext<<2)+4 : 32;
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108 #endif
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109 fr->framesize = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000;
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110 fr->framesize /= mpglib_freqs[fr->sampling_frequency];
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111 fr->framesize = ((fr->framesize+fr->padding)<<2)-4;
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112 #else
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113 __Sound_SetError("MPGLIB: Not supported!");
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114 #endif
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115 break;
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116 case 2:
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117 #ifdef LAYER2
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118 #if 0
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119 fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
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120 (fr->mode_ext<<2)+4 : fr->II_sblimit;
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121 #endif
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122 fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000;
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123 fr->framesize /= mpglib_freqs[fr->sampling_frequency];
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124 fr->framesize += fr->padding - 4;
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125 #else
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126 __Sound_SetError("MPGLIB: Not supported!");
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127 #endif
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128 break;
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129 case 3:
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130 #if 0
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131 fr->do_layer = do_layer3;
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132 if(fr->lsf)
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133 ssize = (fr->stereo == 1) ? 9 : 17;
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134 else
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135 ssize = (fr->stereo == 1) ? 17 : 32;
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136 #endif
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137
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138 #if 0
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139 if(fr->error_protection)
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140 ssize += 2;
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141 #endif
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142 fr->framesize = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000;
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143 fr->framesize /= mpglib_freqs[fr->sampling_frequency]<<(fr->lsf);
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144 fr->framesize = fr->framesize + fr->padding - 4;
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145 break;
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146 default:
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147 BAIL_MACRO("MPGLIB: Unknown layer type.", 0);
298
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148 }
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149 return 1;
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150 }
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151
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152 #if 0
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153 void print_header(struct frame *fr)
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154 {
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155 static char *modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" };
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156 static char *layers[4] = { "Unknown" , "I", "II", "III" };
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157
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158 fprintf(stderr,"MPEG %s, Layer: %s, Freq: %ld, mode: %s, modext: %d, BPF : %d\n",
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159 fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"),
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160 layers[fr->lay],mpglib_freqs[fr->sampling_frequency],
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161 modes[fr->mode],fr->mode_ext,fr->framesize+4);
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162 fprintf(stderr,"Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d.\n",
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163 fr->stereo,fr->copyright?"Yes":"No",
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164 fr->original?"Yes":"No",fr->error_protection?"Yes":"No",
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165 fr->emphasis);
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166 fprintf(stderr,"Bitrate: %d Kbits/s, Extension value: %d\n",
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167 tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],fr->extension);
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168 }
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169
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170 void print_header_compact(struct frame *fr)
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171 {
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172 static char *modes[4] = { "stereo", "joint-stereo", "dual-channel", "mono" };
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173 static char *layers[4] = { "Unknown" , "I", "II", "III" };
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174
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175 fprintf(stderr,"MPEG %s layer %s, %d kbit/s, %ld Hz %s\n",
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176 fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"),
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177 layers[fr->lay],
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178 tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],
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179 mpglib_freqs[fr->sampling_frequency], modes[fr->mode]);
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180 }
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181
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182 #endif
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183
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184 unsigned int getbits(int number_of_bits)
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185 {
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186 unsigned long rval;
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187
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188 if(!number_of_bits)
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189 return 0;
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190
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191 {
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192 rval = wordpointer[0];
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193 rval <<= 8;
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194 rval |= wordpointer[1];
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195 rval <<= 8;
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196 rval |= wordpointer[2];
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197 rval <<= bitindex;
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198 rval &= 0xffffff;
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199
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200 bitindex += number_of_bits;
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201
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202 rval >>= (24-number_of_bits);
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203
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204 wordpointer += (bitindex>>3);
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205 bitindex &= 7;
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Ryan C. Gordon <icculus@icculus.org>
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206 }
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207 return rval;
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208 }
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209
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210 unsigned int getbits_fast(int number_of_bits)
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211 {
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212 unsigned long rval;
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213
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Ryan C. Gordon <icculus@icculus.org>
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214 {
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215 rval = wordpointer[0];
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216 rval <<= 8;
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Ryan C. Gordon <icculus@icculus.org>
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217 rval |= wordpointer[1];
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218 rval <<= bitindex;
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219 rval &= 0xffff;
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Ryan C. Gordon <icculus@icculus.org>
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220 bitindex += number_of_bits;
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221
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222 rval >>= (16-number_of_bits);
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223
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224 wordpointer += (bitindex>>3);
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225 bitindex &= 7;
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Ryan C. Gordon <icculus@icculus.org>
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226 }
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227 return rval;
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228 }
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229
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230 unsigned int get1bit(void)
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231 {
c92c07e07636 Renamed from common.c.
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232 unsigned char rval;
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233 rval = *wordpointer << bitindex;
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234
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235 bitindex++;
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236 wordpointer += (bitindex>>3);
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237 bitindex &= 7;
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238
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Ryan C. Gordon <icculus@icculus.org>
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239 return rval>>7;
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Ryan C. Gordon <icculus@icculus.org>
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240 }
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241
c92c07e07636 Renamed from common.c.
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242
c92c07e07636 Renamed from common.c.
Ryan C. Gordon <icculus@icculus.org>
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243