Rev 1905 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1905 | serge | 1 | /* |
| 2 | layer2.c: the layer 2 decoder, root of mpg123 |
||
| 3 | |||
| 3960 | Serge | 4 | copyright 1994-2009 by the mpg123 project - free software under the terms of the LGPL 2.1 |
| 1905 | serge | 5 | see COPYING and AUTHORS files in distribution or http://mpg123.org |
| 6 | initially written by Michael Hipp |
||
| 7 | |||
| 8 | mpg123 started as mp2 decoder a long time ago... |
||
| 9 | part of this file is required for layer 1, too. |
||
| 10 | */ |
||
| 11 | |||
| 12 | |||
| 13 | #include "mpg123lib_intern.h" |
||
| 14 | #ifndef NO_LAYER2 |
||
| 15 | #include "l2tables.h" |
||
| 16 | #endif |
||
| 17 | #include "getbits.h" |
||
| 18 | |||
| 19 | #ifndef NO_LAYER12 /* Stuff needed for layer I and II. */ |
||
| 20 | |||
| 21 | static int grp_3tab[32 * 3] = { 0, }; /* used: 27 */ |
||
| 22 | static int grp_5tab[128 * 3] = { 0, }; /* used: 125 */ |
||
| 23 | static int grp_9tab[1024 * 3] = { 0, }; /* used: 729 */ |
||
| 24 | |||
| 25 | #if defined(REAL_IS_FIXED) && defined(PRECALC_TABLES) |
||
| 26 | #include "l12_integer_tables.h" |
||
| 27 | #else |
||
| 28 | static const double mulmul[27] = |
||
| 29 | { |
||
| 30 | 0.0 , -2.0/3.0 , 2.0/3.0 , |
||
| 31 | 2.0/7.0 , 2.0/15.0 , 2.0/31.0, 2.0/63.0 , 2.0/127.0 , 2.0/255.0 , |
||
| 32 | 2.0/511.0 , 2.0/1023.0 , 2.0/2047.0 , 2.0/4095.0 , 2.0/8191.0 , |
||
| 33 | 2.0/16383.0 , 2.0/32767.0 , 2.0/65535.0 , |
||
| 34 | -4.0/5.0 , -2.0/5.0 , 2.0/5.0, 4.0/5.0 , |
||
| 35 | -8.0/9.0 , -4.0/9.0 , -2.0/9.0 , 2.0/9.0 , 4.0/9.0 , 8.0/9.0 |
||
| 36 | }; |
||
| 37 | #endif |
||
| 38 | |||
| 39 | void init_layer12(void) |
||
| 40 | { |
||
| 41 | const int base[3][9] = |
||
| 42 | { |
||
| 43 | { 1 , 0, 2 , } , |
||
| 44 | { 17, 18, 0 , 19, 20 , } , |
||
| 45 | { 21, 1, 22, 23, 0, 24, 25, 2, 26 } |
||
| 46 | }; |
||
| 47 | int i,j,k,l,len; |
||
| 48 | const int tablen[3] = { 3 , 5 , 9 }; |
||
| 49 | int *itable; |
||
| 50 | int *tables[3] = { grp_3tab , grp_5tab , grp_9tab }; |
||
| 51 | |||
| 52 | for(i=0;i<3;i++) |
||
| 53 | { |
||
| 54 | itable = tables[i]; |
||
| 55 | len = tablen[i]; |
||
| 56 | for(j=0;j |
||
| 57 | for(k=0;k |
||
| 58 | for(l=0;l |
||
| 59 | { |
||
| 60 | *itable++ = base[i][l]; |
||
| 61 | *itable++ = base[i][k]; |
||
| 62 | *itable++ = base[i][j]; |
||
| 63 | } |
||
| 64 | } |
||
| 65 | } |
||
| 66 | |||
| 67 | void init_layer12_stuff(mpg123_handle *fr, real* (*init_table)(mpg123_handle *fr, real *table, int m)) |
||
| 68 | { |
||
| 69 | int k; |
||
| 70 | real *table; |
||
| 71 | for(k=0;k<27;k++) |
||
| 72 | { |
||
| 73 | table = init_table(fr, fr->muls[k], k); |
||
| 74 | *table++ = 0.0; |
||
| 75 | } |
||
| 76 | } |
||
| 77 | |||
| 78 | real* init_layer12_table(mpg123_handle *fr, real *table, int m) |
||
| 79 | { |
||
| 80 | #if defined(REAL_IS_FIXED) && defined(PRECALC_TABLES) |
||
| 81 | int i; |
||
| 82 | for(i=0;i<63;i++) |
||
| 83 | *table++ = layer12_table[m][i]; |
||
| 84 | #else |
||
| 85 | int i,j; |
||
| 86 | for(j=3,i=0;i<63;i++,j--) |
||
| 87 | *table++ = DOUBLE_TO_REAL_SCALE_LAYER12(mulmul[m] * pow(2.0,(double) j / 3.0)); |
||
| 88 | #endif |
||
| 89 | |||
| 90 | return table; |
||
| 91 | } |
||
| 92 | |||
| 93 | #ifdef OPT_MMXORSSE |
||
| 94 | real* init_layer12_table_mmx(mpg123_handle *fr, real *table, int m) |
||
| 95 | { |
||
| 96 | int i,j; |
||
| 3960 | Serge | 97 | if(!fr->p.down_sample) |
| 1905 | serge | 98 | { |
| 99 | for(j=3,i=0;i<63;i++,j--) |
||
| 100 | *table++ = DOUBLE_TO_REAL(16384 * mulmul[m] * pow(2.0,(double) j / 3.0)); |
||
| 101 | } |
||
| 102 | else |
||
| 103 | { |
||
| 104 | for(j=3,i=0;i<63;i++,j--) |
||
| 105 | *table++ = DOUBLE_TO_REAL(mulmul[m] * pow(2.0,(double) j / 3.0)); |
||
| 106 | } |
||
| 107 | return table; |
||
| 108 | } |
||
| 109 | #endif |
||
| 110 | |||
| 111 | #endif /* NO_LAYER12 */ |
||
| 112 | |||
| 113 | /* The rest is the actual decoding of layer II data. */ |
||
| 114 | |||
| 115 | #ifndef NO_LAYER2 |
||
| 116 | |||
| 3960 | Serge | 117 | static void II_step_one(unsigned int *bit_alloc,int *scale,mpg123_handle *fr) |
| 1905 | serge | 118 | { |
| 119 | int stereo = fr->stereo-1; |
||
| 120 | int sblimit = fr->II_sblimit; |
||
| 121 | int jsbound = fr->jsbound; |
||
| 122 | int sblimit2 = fr->II_sblimit< |
||
| 123 | const struct al_table *alloc1 = fr->alloc; |
||
| 124 | int i; |
||
| 125 | unsigned int scfsi_buf[64]; |
||
| 126 | unsigned int *scfsi,*bita; |
||
| 127 | int sc,step; |
||
| 128 | |||
| 129 | bita = bit_alloc; |
||
| 130 | if(stereo) |
||
| 131 | { |
||
| 132 | for(i=jsbound;i;i--,alloc1+=(1< |
||
| 133 | { |
||
| 134 | step=alloc1->bits; |
||
| 135 | *bita++ = (char) getbits(fr, step); |
||
| 136 | *bita++ = (char) getbits(fr, step); |
||
| 137 | } |
||
| 138 | for(i=sblimit-jsbound;i;i--,alloc1+=(1< |
||
| 139 | { |
||
| 140 | step=alloc1->bits; |
||
| 141 | bita[0] = (char) getbits(fr, step); |
||
| 142 | bita[1] = bita[0]; |
||
| 143 | bita+=2; |
||
| 144 | } |
||
| 145 | bita = bit_alloc; |
||
| 146 | scfsi=scfsi_buf; |
||
| 147 | |||
| 148 | for(i=sblimit2;i;i--) |
||
| 149 | if(*bita++) *scfsi++ = (char) getbits_fast(fr, 2); |
||
| 150 | } |
||
| 151 | else /* mono */ |
||
| 152 | { |
||
| 153 | for(i=sblimit;i;i--,alloc1+=(1< |
||
| 154 | { |
||
| 155 | step=alloc1->bits; |
||
| 156 | *bita++ = (char) getbits(fr, step); |
||
| 157 | } |
||
| 158 | bita = bit_alloc; |
||
| 159 | scfsi=scfsi_buf; |
||
| 160 | for(i=sblimit;i;i--) |
||
| 161 | if(*bita++) *scfsi++ = (char) getbits_fast(fr, 2); |
||
| 162 | } |
||
| 163 | |||
| 164 | bita = bit_alloc; |
||
| 165 | scfsi=scfsi_buf; |
||
| 166 | for(i=sblimit2;i;i--) |
||
| 167 | if(*bita++) |
||
| 168 | switch(*scfsi++) |
||
| 169 | { |
||
| 3960 | Serge | 170 | case 0: |
| 1905 | serge | 171 | *scale++ = getbits_fast(fr, 6); |
| 172 | *scale++ = getbits_fast(fr, 6); |
||
| 173 | *scale++ = getbits_fast(fr, 6); |
||
| 174 | break; |
||
| 3960 | Serge | 175 | case 1 : |
| 1905 | serge | 176 | *scale++ = sc = getbits_fast(fr, 6); |
| 177 | *scale++ = sc; |
||
| 178 | *scale++ = getbits_fast(fr, 6); |
||
| 179 | break; |
||
| 3960 | Serge | 180 | case 2: |
| 1905 | serge | 181 | *scale++ = sc = getbits_fast(fr, 6); |
| 182 | *scale++ = sc; |
||
| 183 | *scale++ = sc; |
||
| 184 | break; |
||
| 185 | default: /* case 3 */ |
||
| 186 | *scale++ = getbits_fast(fr, 6); |
||
| 187 | *scale++ = sc = getbits_fast(fr, 6); |
||
| 188 | *scale++ = sc; |
||
| 189 | break; |
||
| 190 | } |
||
| 191 | } |
||
| 192 | |||
| 193 | |||
| 3960 | Serge | 194 | static void II_step_two(unsigned int *bit_alloc,real fraction[2][4][SBLIMIT],int *scale,mpg123_handle *fr,int x1) |
| 1905 | serge | 195 | { |
| 196 | int i,j,k,ba; |
||
| 197 | int stereo = fr->stereo; |
||
| 198 | int sblimit = fr->II_sblimit; |
||
| 199 | int jsbound = fr->jsbound; |
||
| 200 | const struct al_table *alloc2,*alloc1 = fr->alloc; |
||
| 201 | unsigned int *bita=bit_alloc; |
||
| 202 | int d1,step; |
||
| 203 | |||
| 204 | for(i=0;i |
||
| 205 | { |
||
| 206 | step = alloc1->bits; |
||
| 207 | for(j=0;j |
||
| 208 | { |
||
| 3960 | Serge | 209 | if( (ba=*bita++) ) |
| 1905 | serge | 210 | { |
| 211 | k=(alloc2 = alloc1+ba)->bits; |
||
| 3960 | Serge | 212 | if( (d1=alloc2->d) < 0) |
| 1905 | serge | 213 | { |
| 214 | real cm=fr->muls[k][scale[x1]]; |
||
| 215 | fraction[j][0][i] = REAL_MUL_SCALE_LAYER12(DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1), cm); |
||
| 216 | fraction[j][1][i] = REAL_MUL_SCALE_LAYER12(DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1), cm); |
||
| 217 | fraction[j][2][i] = REAL_MUL_SCALE_LAYER12(DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1), cm); |
||
| 3960 | Serge | 218 | } |
| 219 | else |
||
| 1905 | serge | 220 | { |
| 221 | const int *table[] = { 0,0,0,grp_3tab,0,grp_5tab,0,0,0,grp_9tab }; |
||
| 222 | unsigned int idx,*tab,m=scale[x1]; |
||
| 223 | idx = (unsigned int) getbits(fr, k); |
||
| 224 | tab = (unsigned int *) (table[d1] + idx + idx + idx); |
||
| 225 | fraction[j][0][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m]); |
||
| 226 | fraction[j][1][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m]); |
||
| 3960 | Serge | 227 | fraction[j][2][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m]); |
| 1905 | serge | 228 | } |
| 229 | scale+=3; |
||
| 230 | } |
||
| 231 | else |
||
| 232 | fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = DOUBLE_TO_REAL(0.0); |
||
| 233 | } |
||
| 234 | } |
||
| 235 | |||
| 236 | for(i=jsbound;i |
||
| 237 | { |
||
| 238 | step = alloc1->bits; |
||
| 239 | bita++; /* channel 1 and channel 2 bitalloc are the same */ |
||
| 240 | if( (ba=*bita++) ) |
||
| 241 | { |
||
| 242 | k=(alloc2 = alloc1+ba)->bits; |
||
| 243 | if( (d1=alloc2->d) < 0) |
||
| 244 | { |
||
| 245 | real cm; |
||
| 246 | cm=fr->muls[k][scale[x1+3]]; |
||
| 247 | fraction[0][0][i] = DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1); |
||
| 248 | fraction[0][1][i] = DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1); |
||
| 249 | fraction[0][2][i] = DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1); |
||
| 250 | fraction[1][0][i] = REAL_MUL_SCALE_LAYER12(fraction[0][0][i], cm); |
||
| 251 | fraction[1][1][i] = REAL_MUL_SCALE_LAYER12(fraction[0][1][i], cm); |
||
| 252 | fraction[1][2][i] = REAL_MUL_SCALE_LAYER12(fraction[0][2][i], cm); |
||
| 253 | cm=fr->muls[k][scale[x1]]; |
||
| 254 | fraction[0][0][i] = REAL_MUL_SCALE_LAYER12(fraction[0][0][i], cm); |
||
| 255 | fraction[0][1][i] = REAL_MUL_SCALE_LAYER12(fraction[0][1][i], cm); |
||
| 256 | fraction[0][2][i] = REAL_MUL_SCALE_LAYER12(fraction[0][2][i], cm); |
||
| 257 | } |
||
| 258 | else |
||
| 259 | { |
||
| 260 | const int *table[] = { 0,0,0,grp_3tab,0,grp_5tab,0,0,0,grp_9tab }; |
||
| 261 | unsigned int idx,*tab,m1,m2; |
||
| 262 | m1 = scale[x1]; m2 = scale[x1+3]; |
||
| 263 | idx = (unsigned int) getbits(fr, k); |
||
| 264 | tab = (unsigned int *) (table[d1] + idx + idx + idx); |
||
| 265 | fraction[0][0][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m1]); fraction[1][0][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m2]); |
||
| 266 | fraction[0][1][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m1]); fraction[1][1][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m2]); |
||
| 267 | fraction[0][2][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m1]); fraction[1][2][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m2]); |
||
| 268 | } |
||
| 269 | scale+=6; |
||
| 270 | } |
||
| 271 | else |
||
| 272 | { |
||
| 273 | fraction[0][0][i] = fraction[0][1][i] = fraction[0][2][i] = |
||
| 274 | fraction[1][0][i] = fraction[1][1][i] = fraction[1][2][i] = DOUBLE_TO_REAL(0.0); |
||
| 275 | } |
||
| 276 | /* |
||
| 277 | Historic comment... |
||
| 278 | should we use individual scalefac for channel 2 or |
||
| 279 | is the current way the right one , where we just copy channel 1 to |
||
| 3960 | Serge | 280 | channel 2 ?? |
| 1905 | serge | 281 | The current 'strange' thing is, that we throw away the scalefac |
| 282 | values for the second channel ...!! |
||
| 3960 | Serge | 283 | -> changed .. now we use the scalefac values of channel one !! |
| 1905 | serge | 284 | */ |
| 285 | } |
||
| 286 | |||
| 287 | if(sblimit > (fr->down_sample_sblimit) ) |
||
| 288 | sblimit = fr->down_sample_sblimit; |
||
| 289 | |||
| 290 | for(i=sblimit;i |
||
| 291 | for (j=0;j |
||
| 292 | fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = DOUBLE_TO_REAL(0.0); |
||
| 293 | } |
||
| 294 | |||
| 295 | |||
| 296 | static void II_select_table(mpg123_handle *fr) |
||
| 297 | { |
||
| 298 | const int translate[3][2][16] = |
||
| 299 | { |
||
| 300 | { |
||
| 301 | { 0,2,2,2,2,2,2,0,0,0,1,1,1,1,1,0 }, |
||
| 302 | { 0,2,2,0,0,0,1,1,1,1,1,1,1,1,1,0 } |
||
| 303 | }, |
||
| 304 | { |
||
| 305 | { 0,2,2,2,2,2,2,0,0,0,0,0,0,0,0,0 }, |
||
| 306 | { 0,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0 } |
||
| 307 | }, |
||
| 308 | { |
||
| 309 | { 0,3,3,3,3,3,3,0,0,0,1,1,1,1,1,0 }, |
||
| 310 | { 0,3,3,0,0,0,1,1,1,1,1,1,1,1,1,0 } |
||
| 311 | } |
||
| 312 | }; |
||
| 313 | |||
| 314 | int table,sblim; |
||
| 315 | const struct al_table *tables[5] = { alloc_0, alloc_1, alloc_2, alloc_3 , alloc_4 }; |
||
| 316 | const int sblims[5] = { 27 , 30 , 8, 12 , 30 }; |
||
| 317 | |||
| 318 | if(fr->sampling_frequency >= 3) /* Or equivalent: (fr->lsf == 1) */ |
||
| 319 | table = 4; |
||
| 320 | else |
||
| 321 | table = translate[fr->sampling_frequency][2-fr->stereo][fr->bitrate_index]; |
||
| 322 | |||
| 323 | sblim = sblims[table]; |
||
| 324 | fr->alloc = tables[table]; |
||
| 325 | fr->II_sblimit = sblim; |
||
| 326 | } |
||
| 327 | |||
| 328 | |||
| 329 | int do_layer2(mpg123_handle *fr) |
||
| 330 | { |
||
| 331 | int clip=0; |
||
| 332 | int i,j; |
||
| 333 | int stereo = fr->stereo; |
||
| 3960 | Serge | 334 | /* pick_table clears unused subbands */ |
| 335 | /* replacement for real fraction[2][4][SBLIMIT], needs alignment. */ |
||
| 336 | real (*fraction)[4][SBLIMIT] = fr->layer2.fraction; |
||
| 1905 | serge | 337 | unsigned int bit_alloc[64]; |
| 338 | int scale[192]; |
||
| 339 | int single = fr->single; |
||
| 340 | |||
| 341 | II_select_table(fr); |
||
| 342 | fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext<<2)+4 : fr->II_sblimit; |
||
| 343 | |||
| 344 | if(fr->jsbound > fr->II_sblimit) |
||
| 345 | { |
||
| 3960 | Serge | 346 | fprintf(stderr, "Truncating stereo boundary to sideband limit.\n"); |
| 1905 | serge | 347 | fr->jsbound=fr->II_sblimit; |
| 348 | } |
||
| 349 | |||
| 350 | /* TODO: What happens with mono mixing, actually? */ |
||
| 351 | if(stereo == 1 || single == SINGLE_MIX) /* also, mix not really handled */ |
||
| 352 | single = SINGLE_LEFT; |
||
| 353 | |||
| 354 | II_step_one(bit_alloc, scale, fr); |
||
| 355 | |||
| 356 | for(i=0;i |
||
| 357 | { |
||
| 358 | II_step_two(bit_alloc,fraction,scale,fr,i>>2); |
||
| 3960 | Serge | 359 | for(j=0;j<3;j++) |
| 1905 | serge | 360 | { |
| 361 | if(single != SINGLE_STEREO) |
||
| 362 | clip += (fr->synth_mono)(fraction[single][j], fr); |
||
| 363 | else |
||
| 364 | clip += (fr->synth_stereo)(fraction[0][j], fraction[1][j], fr); |
||
| 365 | } |
||
| 366 | } |
||
| 367 | |||
| 368 | return clip; |
||
| 369 | } |
||
| 370 | |||
| 371 | #endif /* NO_LAYER2 */ |