Mercurial > SDL_sound_CoreAudio
annotate decoders/mpglib/common.c @ 278:dfe4a46f88f7
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 14 Mar 2002 16:38:32 +0000 |
| parents | 9e7f9e09ea0e |
| children | a9e211c3faa4 |
| rev | line source |
|---|---|
| 261 | 1 #include <ctype.h> |
| 2 #include <stdlib.h> | |
| 3 #include <signal.h> | |
| 4 | |
| 5 #include <sys/types.h> | |
| 6 #include <sys/stat.h> | |
| 7 #include <fcntl.h> | |
| 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 |
| 261 | 14 #include "mpg123_sdlsound.h" |
| 15 | |
| 16 struct parameter param = { 1 , 1 , 0 , 0 }; | |
| 17 | |
| 18 int tabsel_123[2][3][16] = { | |
| 19 { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,}, | |
| 20 {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,}, | |
| 21 {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} }, | |
| 22 | |
| 23 { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,}, | |
| 24 {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,}, | |
| 25 {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} } | |
| 26 }; | |
| 27 | |
| 28 long freqs[9] = { 44100, 48000, 32000, | |
| 29 22050, 24000, 16000 , | |
| 30 11025 , 12000 , 8000 }; | |
| 31 | |
| 32 int bitindex; | |
| 33 unsigned char *wordpointer; | |
| 34 unsigned char *pcm_sample; | |
| 35 int pcm_point = 0; | |
| 36 | |
| 37 | |
| 38 #define HDRCMPMASK 0xfffffd00 | |
| 39 | |
| 40 #if 0 | |
| 41 int head_check(unsigned long head) | |
| 42 { | |
| 43 if( (head & 0xffe00000) != 0xffe00000) | |
| 44 return FALSE; | |
| 45 if(!((head>>17)&3)) | |
| 46 return FALSE; | |
| 47 if( ((head>>12)&0xf) == 0xf) | |
| 48 return FALSE; | |
| 49 if( ((head>>10)&0x3) == 0x3 ) | |
| 50 return FALSE; | |
| 51 return TRUE; | |
| 52 } | |
| 53 #endif | |
| 54 | |
| 55 | |
| 56 /* | |
| 57 * the code a header and write the information | |
| 58 * into the frame structure | |
| 59 */ | |
| 60 int decode_header(struct frame *fr,unsigned long newhead) | |
| 61 { | |
| 62 if( newhead & (1<<20) ) { | |
| 63 fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1; | |
| 64 fr->mpeg25 = 0; | |
| 65 } | |
| 66 else { | |
| 67 fr->lsf = 1; | |
| 68 fr->mpeg25 = 1; | |
| 69 } | |
| 70 | |
| 71 fr->lay = 4-((newhead>>17)&3); | |
| 72 if( ((newhead>>10)&0x3) == 0x3) { | |
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73 Sound_SetError("MPGLIB: Corrupted header"); |
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74 return 0; |
| 261 | 75 } |
| 76 if(fr->mpeg25) { | |
| 77 fr->sampling_frequency = 6 + ((newhead>>10)&0x3); | |
| 78 } | |
| 79 else | |
| 80 fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3); | |
| 81 fr->error_protection = ((newhead>>16)&0x1)^0x1; | |
| 82 | |
| 83 if(fr->mpeg25) /* allow Bitrate change for 2.5 ... */ | |
| 84 fr->bitrate_index = ((newhead>>12)&0xf); | |
| 85 | |
| 86 fr->bitrate_index = ((newhead>>12)&0xf); | |
| 87 fr->padding = ((newhead>>9)&0x1); | |
| 88 fr->extension = ((newhead>>8)&0x1); | |
| 89 fr->mode = ((newhead>>6)&0x3); | |
| 90 fr->mode_ext = ((newhead>>4)&0x3); | |
| 91 fr->copyright = ((newhead>>3)&0x1); | |
| 92 fr->original = ((newhead>>2)&0x1); | |
| 93 fr->emphasis = newhead & 0x3; | |
| 94 | |
| 95 fr->stereo = (fr->mode == MPG_MD_MONO) ? 1 : 2; | |
| 96 | |
| 97 if(!fr->bitrate_index) | |
| 98 { | |
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99 Sound_SetError("MPGLIB: Free format not supported."); |
| 261 | 100 return (0); |
| 101 } | |
| 102 | |
| 103 switch(fr->lay) | |
| 104 { | |
| 105 case 1: | |
| 106 #ifdef LAYER1 | |
| 107 #if 0 | |
| 108 fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? | |
| 109 (fr->mode_ext<<2)+4 : 32; | |
| 110 #endif | |
| 111 fr->framesize = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000; | |
| 112 fr->framesize /= freqs[fr->sampling_frequency]; | |
| 113 fr->framesize = ((fr->framesize+fr->padding)<<2)-4; | |
| 114 #else | |
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parents:
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115 Sound_SetError("MPGLIB: Not supported!"); |
| 261 | 116 #endif |
| 117 break; | |
| 118 case 2: | |
| 119 #ifdef LAYER2 | |
| 120 #if 0 | |
| 121 fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? | |
| 122 (fr->mode_ext<<2)+4 : fr->II_sblimit; | |
| 123 #endif | |
| 124 fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000; | |
| 125 fr->framesize /= freqs[fr->sampling_frequency]; | |
| 126 fr->framesize += fr->padding - 4; | |
| 127 #else | |
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parents:
273
diff
changeset
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128 Sound_SetError("MPGLIB: Not supported!"); |
| 261 | 129 #endif |
| 130 break; | |
| 131 case 3: | |
| 132 #if 0 | |
| 133 fr->do_layer = do_layer3; | |
| 134 if(fr->lsf) | |
| 135 ssize = (fr->stereo == 1) ? 9 : 17; | |
| 136 else | |
| 137 ssize = (fr->stereo == 1) ? 17 : 32; | |
| 138 #endif | |
| 139 | |
| 140 #if 0 | |
| 141 if(fr->error_protection) | |
| 142 ssize += 2; | |
| 143 #endif | |
| 144 fr->framesize = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000; | |
| 145 fr->framesize /= freqs[fr->sampling_frequency]<<(fr->lsf); | |
| 146 fr->framesize = fr->framesize + fr->padding - 4; | |
| 147 break; | |
| 148 default: | |
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9e7f9e09ea0e
Removed fprintf() calls. Replaced with SNDDBG() and Sound_SetError() calls.
Ryan C. Gordon <icculus@icculus.org>
parents:
273
diff
changeset
|
149 Sound_SetError("MPGLIB: Unknown layer type."); |
| 261 | 150 return (0); |
| 151 } | |
| 152 return 1; | |
| 153 } | |
| 154 | |
| 155 #if 0 | |
| 156 void print_header(struct frame *fr) | |
| 157 { | |
| 158 static char *modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" }; | |
| 159 static char *layers[4] = { "Unknown" , "I", "II", "III" }; | |
| 160 | |
| 161 fprintf(stderr,"MPEG %s, Layer: %s, Freq: %ld, mode: %s, modext: %d, BPF : %d\n", | |
| 162 fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"), | |
| 163 layers[fr->lay],freqs[fr->sampling_frequency], | |
| 164 modes[fr->mode],fr->mode_ext,fr->framesize+4); | |
| 165 fprintf(stderr,"Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d.\n", | |
| 166 fr->stereo,fr->copyright?"Yes":"No", | |
| 167 fr->original?"Yes":"No",fr->error_protection?"Yes":"No", | |
| 168 fr->emphasis); | |
| 169 fprintf(stderr,"Bitrate: %d Kbits/s, Extension value: %d\n", | |
| 170 tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],fr->extension); | |
| 171 } | |
| 172 | |
| 173 void print_header_compact(struct frame *fr) | |
| 174 { | |
| 175 static char *modes[4] = { "stereo", "joint-stereo", "dual-channel", "mono" }; | |
| 176 static char *layers[4] = { "Unknown" , "I", "II", "III" }; | |
| 177 | |
| 178 fprintf(stderr,"MPEG %s layer %s, %d kbit/s, %ld Hz %s\n", | |
| 179 fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"), | |
| 180 layers[fr->lay], | |
| 181 tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index], | |
| 182 freqs[fr->sampling_frequency], modes[fr->mode]); | |
| 183 } | |
| 184 | |
| 185 #endif | |
| 186 | |
| 187 unsigned int getbits(int number_of_bits) | |
| 188 { | |
| 189 unsigned long rval; | |
| 190 | |
| 191 if(!number_of_bits) | |
| 192 return 0; | |
| 193 | |
| 194 { | |
| 195 rval = wordpointer[0]; | |
| 196 rval <<= 8; | |
| 197 rval |= wordpointer[1]; | |
| 198 rval <<= 8; | |
| 199 rval |= wordpointer[2]; | |
| 200 rval <<= bitindex; | |
| 201 rval &= 0xffffff; | |
| 202 | |
| 203 bitindex += number_of_bits; | |
| 204 | |
| 205 rval >>= (24-number_of_bits); | |
| 206 | |
| 207 wordpointer += (bitindex>>3); | |
| 208 bitindex &= 7; | |
| 209 } | |
| 210 return rval; | |
| 211 } | |
| 212 | |
| 213 unsigned int getbits_fast(int number_of_bits) | |
| 214 { | |
| 215 unsigned long rval; | |
| 216 | |
| 217 { | |
| 218 rval = wordpointer[0]; | |
| 219 rval <<= 8; | |
| 220 rval |= wordpointer[1]; | |
| 221 rval <<= bitindex; | |
| 222 rval &= 0xffff; | |
| 223 bitindex += number_of_bits; | |
| 224 | |
| 225 rval >>= (16-number_of_bits); | |
| 226 | |
| 227 wordpointer += (bitindex>>3); | |
| 228 bitindex &= 7; | |
| 229 } | |
| 230 return rval; | |
| 231 } | |
| 232 | |
| 233 unsigned int get1bit(void) | |
| 234 { | |
| 235 unsigned char rval; | |
| 236 rval = *wordpointer << bitindex; | |
| 237 | |
| 238 bitindex++; | |
| 239 wordpointer += (bitindex>>3); | |
| 240 bitindex &= 7; | |
| 241 | |
| 242 return rval>>7; | |
| 243 } | |
| 244 | |
| 245 | |
| 246 |