mp3lib/sr1.c

   1 // #define NEWBUFFERING
   2 //#define DEBUG_RESYNC
   3
   4 /* 1 frame = 4608 byte PCM */
   5
   6 #define LOCAL static inline
   7
   8 //#undef LOCAL
   9 //#define LOCAL
  10
  11 #include        <stdlib.h>
  12 #include        <stdio.h>
  13 #include        <string.h>
  14 #include        <math.h>
  15
  16 #include "mpg123.h"
  17 #include "huffman.h"
  18 #include "mp3.h"
  19 #include "mpbswap.h"
  20 #include "cpudetect.h"
  21 //#include "liba52/mm_accel.h"
  22 #include "mp_msg.h"
  23
  24 #include "libvo/fastmemcpy.h"
  25
  26 #include "libavutil/common.h"
  27
  28 #if ARCH_X86_64
  29 // 3DNow! and 3DNow!Ext routines don't compile under AMD64
  30 #undef HAVE_AMD3DNOW
  31 #undef HAVE_AMD3DNOWEXT
  32 #define HAVE_AMD3DNOW 0
  33 #define HAVE_AMD3DNOWEXT 0
  34 #endif
  35
  36 //static FILE* mp3_file=NULL;
  37
  38 int MP3_frames=0;
  39 int MP3_eof=0;
  40 int MP3_pause=0;
  41 int MP3_filesize=0;
  42 int MP3_fpos=0;      // current file position
  43 int MP3_framesize=0; // current framesize
  44 int MP3_bitrate=0;   // current bitrate
  45 int MP3_samplerate=0;  // current samplerate
  46 int MP3_resync=0;
  47 int MP3_channels=0;
  48 int MP3_bps=2;
  49
  50 static long outscale = 32768;
  51 #include "tabinit.c"
  52
  53 #if 1
  54 int mplayer_audio_read(char *buf,int size);
  55
  56 LOCAL int mp3_read(char *buf,int size){
  57 //  int len=fread(buf,1,size,mp3_file);
  58   int len=mplayer_audio_read(buf,size);
  59   if(len>0) MP3_fpos+=len;
  60 //  if(len!=size) MP3_eof=1;
  61   return len;
  62 }
  63 #else
  64 int mp3_read(char *buf,int size);
  65 #endif
  66 /*
  67  * Modified for use with MPlayer, for details see the changelog at
  68  * http://svn.mplayerhq.hu/mplayer/trunk/
  69  * $Id$
  70  */
  71
  72
  73 //void mp3_seek(int pos){
  74 //  fseek(mp3_file,pos,SEEK_SET);
  75 //  return MP3_fpos = ftell(mp3_file);
  76 //}
  77
  78 /*       Frame reader           */
  79
  80 #define MAXFRAMESIZE 1280
  81 #define MAXFRAMESIZE2 (512+MAXFRAMESIZE)
  82
  83 static int fsizeold=0,ssize=0;
  84 static unsigned char bsspace[2][MAXFRAMESIZE2]; /* !!!!! */
  85 static unsigned char *bsbufold=bsspace[0]+512;
  86 static unsigned char *bsbuf=bsspace[1]+512;
  87 static int bsnum=0;
  88
  89 static int bitindex;
  90 static unsigned char *wordpointer;
  91 static int bitsleft;
  92
  93 static unsigned char *pcm_sample;   /* outbuffer address */
  94 static int pcm_point = 0;           /* outbuffer offset */
  95
  96 static struct frame fr;
  97
  98 static int tabsel_123[2][3][16] = {
  99    { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
 100      {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
 101      {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
 102
 103    { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
 104      {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
 105      {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
 106 };
 107
 108 static int freqs[9] = { 44100, 48000, 32000, 22050, 24000, 16000 , 11025 , 12000 , 8000 };
 109
 110 LOCAL unsigned int getbits(short number_of_bits)
 111 {
 112   unsigned rval;
 113 //  if(MP3_frames>=7741) printf("getbits: bits=%d  bitsleft=%d  wordptr=%x\n",number_of_bits,bitsleft,wordpointer);
 114   if((bitsleft-=number_of_bits)<0) return 0;
 115   if(!number_of_bits) return 0;
 116          rval = wordpointer[0];
 117          rval <<= 8;
 118          rval |= wordpointer[1];
 119          rval <<= 8;
 120          rval |= wordpointer[2];
 121          rval <<= bitindex;
 122          rval &= 0xffffff;
 123          bitindex += number_of_bits;
 124          rval >>= (24-number_of_bits);
 125          wordpointer += (bitindex>>3);
 126          bitindex &= 7;
 127   return rval;
 128 }
 129
 130
 131 LOCAL unsigned int getbits_fast(short number_of_bits)
 132 {
 133   unsigned rval;
 134 //  if(MP3_frames>=7741) printf("getbits_fast: bits=%d  bitsleft=%d  wordptr=%x\n",number_of_bits,bitsleft,wordpointer);
 135   if((bitsleft-=number_of_bits)<0) return 0;
 136   if(!number_of_bits) return 0;
 137 #if ARCH_X86
 138   rval = bswap_16(*((uint16_t *)wordpointer));
 139 #else
 140   /*
 141    * we may not be able to address unaligned 16-bit data on non-x86 cpus.
 142    * Fall back to some portable code.
 143    */
 144   rval = wordpointer[0] << 8 | wordpointer[1];
 145 #endif
 146          rval <<= bitindex;
 147          rval &= 0xffff;
 148          bitindex += number_of_bits;
 149          rval >>= (16-number_of_bits);
 150          wordpointer += (bitindex>>3);
 151          bitindex &= 7;
 152   return rval;
 153 }
 154
 155 LOCAL unsigned int get1bit(void)
 156 {
 157   unsigned char rval;
 158 //  if(MP3_frames>=7741) printf("get1bit: bitsleft=%d  wordptr=%x\n",bitsleft,wordpointer);
 159   if((--bitsleft)<0) return 0;
 160   rval = *wordpointer << bitindex;
 161   bitindex++;
 162   wordpointer += (bitindex>>3);
 163   bitindex &= 7;
 164   return (rval >> 7) & 1;
 165 }
 166
 167 LOCAL void set_pointer(int backstep)
 168 {
 169 //  if(backstep!=512 && backstep>fsizeold)
 170 //    printf("\rWarning! backstep (%d>%d)                                         \n",backstep,fsizeold);
 171   wordpointer = bsbuf + ssize - backstep;
 172   if (backstep) fast_memcpy(wordpointer,bsbufold+fsizeold-backstep,backstep);
 173   bitindex = 0;
 174   bitsleft+=8*backstep;
 175 //  printf("Backstep %d  (bitsleft=%d)\n",backstep,bitsleft);
 176 }
 177
 178 LOCAL int stream_head_read(unsigned char *hbuf,uint32_t *newhead){
 179   if(mp3_read(hbuf,4) != 4) return FALSE;
 180 #if ARCH_X86
 181   *newhead = bswap_32(*((uint32_t*)hbuf));
 182 #else
 183   /*
 184    * we may not be able to address unaligned 32-bit data on non-x86 cpus.
 185    * Fall back to some portable code.
 186    */
 187   *newhead =
 188       hbuf[0] << 24 |
 189       hbuf[1] << 16 |
 190       hbuf[2] <<  8 |
 191       hbuf[3];
 192 #endif
 193   return TRUE;
 194 }
 195
 196 LOCAL int stream_head_shift(unsigned char *hbuf,uint32_t *head){
 197   *((uint32_t*)hbuf) >>= 8;
 198   if(mp3_read(hbuf+3,1) != 1) return 0;
 199   *head <<= 8;
 200   *head |= hbuf[3];
 201   return 1;
 202 }
 203
 204 /*
 205  * decode a header and write the information
 206  * into the frame structure
 207  */
 208 LOCAL int decode_header(struct frame *fr,uint32_t newhead){
 209
 210     // head_check:
 211     if( (newhead & 0xffe00000) != 0xffe00000 ||
 212         (newhead & 0x0000fc00) == 0x0000fc00) return FALSE;
 213
 214     fr->lay = 4-((newhead>>17)&3);
 215 //    if(fr->lay!=3) return FALSE;
 216
 217     if( newhead & (1<<20) ) {
 218       fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1;
 219       fr->mpeg25 = 0;
 220     } else {
 221       fr->lsf = 1;
 222       fr->mpeg25 = 1;
 223     }
 224
 225     if(fr->mpeg25)
 226       fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
 227     else
 228       fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3);
 229
 230     if(fr->sampling_frequency>8) return FALSE;  // valid: 0..8
 231
 232     fr->error_protection = ((newhead>>16)&0x1)^0x1;
 233     fr->bitrate_index = ((newhead>>12)&0xf);
 234     fr->padding   = ((newhead>>9)&0x1);
 235     fr->extension = ((newhead>>8)&0x1);
 236     fr->mode      = ((newhead>>6)&0x3);
 237     fr->mode_ext  = ((newhead>>4)&0x3);
 238     fr->copyright = ((newhead>>3)&0x1);
 239     fr->original  = ((newhead>>2)&0x1);
 240     fr->emphasis  = newhead & 0x3;
 241
 242     MP3_channels = fr->stereo    = (fr->mode == MPG_MD_MONO) ? 1 : 2;
 243
 244     if(!fr->bitrate_index){
 245 //      fprintf(stderr,"Free format not supported.\n");
 246       return FALSE;
 247     }
 248
 249 switch(fr->lay){
 250   case 2:
 251     MP3_bitrate=tabsel_123[fr->lsf][1][fr->bitrate_index];
 252     MP3_samplerate=freqs[fr->sampling_frequency];
 253     fr->framesize = MP3_bitrate * 144000;
 254     fr->framesize /= MP3_samplerate;
 255     MP3_framesize=fr->framesize;
 256     fr->framesize += fr->padding - 4;
 257     break;
 258   case 3:
 259     if(fr->lsf)
 260       ssize = (fr->stereo == 1) ? 9 : 17;
 261     else
 262       ssize = (fr->stereo == 1) ? 17 : 32;
 263     if(fr->error_protection) ssize += 2;
 264
 265     MP3_bitrate=tabsel_123[fr->lsf][2][fr->bitrate_index];
 266     MP3_samplerate=freqs[fr->sampling_frequency];
 267     fr->framesize  = MP3_bitrate * 144000;
 268     fr->framesize /= MP3_samplerate<<(fr->lsf);
 269     MP3_framesize=fr->framesize;
 270     fr->framesize += fr->padding - 4;
 271     break;
 272   case 1:
 273 //    fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext<<2)+4 : 32;
 274     MP3_bitrate=tabsel_123[fr->lsf][0][fr->bitrate_index];
 275     MP3_samplerate=freqs[fr->sampling_frequency];
 276     fr->framesize  = MP3_bitrate * 12000;
 277     fr->framesize /= MP3_samplerate;
 278     MP3_framesize  = ((fr->framesize+fr->padding)<<2);
 279     fr->framesize  = MP3_framesize-4;
 280 //    printf("framesize=%d\n",fr->framesize);
 281     break;
 282   default:
 283     MP3_framesize=fr->framesize=0;
 284 //    fprintf(stderr,"Sorry, unsupported layer type.\n");
 285     return 0;
 286 }
 287     if(fr->framesize<=0 || fr->framesize>MAXFRAMESIZE) return FALSE;
 288
 289     return 1;
 290 }
 291
 292
 293 LOCAL int stream_read_frame_body(int size){
 294
 295   /* flip/init buffer for Layer 3 */
 296   bsbufold = bsbuf;
 297   bsbuf = bsspace[bsnum]+512;
 298   bsnum = (bsnum + 1) & 1;
 299
 300   if( mp3_read(bsbuf,size) != size) return 0; // broken frame
 301
 302   bitindex = 0;
 303   wordpointer = (unsigned char *) bsbuf;
 304   bitsleft=8*size;
 305
 306   return 1;
 307 }
 308
 309
 310 /*****************************************************************
 311  * read next frame     return number of frames read.
 312  */
 313 LOCAL int read_frame(struct frame *fr){
 314   uint32_t newhead;
 315   union {
 316     unsigned char buf[8];
 317     unsigned long dummy; // for alignment
 318   } hbuf;
 319   int skipped,resyncpos;
 320   int frames=0;
 321
 322 resync:
 323   skipped=MP3_fpos;
 324   resyncpos=MP3_fpos;
 325
 326   set_pointer(512);
 327   fsizeold=fr->framesize;       /* for Layer3 */
 328   if(!stream_head_read(hbuf.buf,&newhead)) return 0;
 329   if(!decode_header(fr,newhead)){
 330     // invalid header! try to resync stream!
 331 #ifdef DEBUG_RESYNC
 332     printf("ReSync: searching for a valid header...  (pos=%X)\n",MP3_fpos);
 333 #endif
 334 retry1:
 335     while(!decode_header(fr,newhead)){
 336       if(!stream_head_shift(hbuf.buf,&newhead)) return 0;
 337     }
 338     resyncpos=MP3_fpos-4;
 339     // found valid header
 340 #ifdef DEBUG_RESYNC
 341     printf("ReSync: found valid hdr at %X  fsize=%ld  ",resyncpos,fr->framesize);
 342 #endif
 343     if(!stream_read_frame_body(fr->framesize)) return 0; // read body
 344     set_pointer(512);
 345     fsizeold=fr->framesize;       /* for Layer3 */
 346     if(!stream_head_read(hbuf.buf,&newhead)) return 0;
 347     if(!decode_header(fr,newhead)){
 348       // invalid hdr! go back...
 349 #ifdef DEBUG_RESYNC
 350       printf("INVALID\n");
 351 #endif
 352 //      mp3_seek(resyncpos+1);
 353       if(!stream_head_read(hbuf.buf,&newhead)) return 0;
 354       goto retry1;
 355     }
 356 #ifdef DEBUG_RESYNC
 357     printf("OK!\n");
 358     ++frames;
 359 #endif
 360   }
 361
 362   skipped=resyncpos-skipped;
 363 //  if(skipped && !MP3_resync) printf("\r%d bad bytes skipped  (resync at 0x%X)                          \n",skipped,resyncpos);
 364
 365 //  printf("%8X [%08X] %d %d (%d)%s%s\n",MP3_fpos-4,newhead,fr->framesize,fr->mode,fr->mode_ext,fr->error_protection?" CRC":"",fr->padding?" PAD":"");
 366
 367   /* read main data into memory */
 368   if(!stream_read_frame_body(fr->framesize)){
 369     printf("\nBroken frame at 0x%X                                                  \n",resyncpos);
 370     return 0;
 371   }
 372   ++frames;
 373
 374   if(MP3_resync){
 375     MP3_resync=0;
 376     if(frames==1) goto resync;
 377   }
 378
 379   return frames;
 380 }
 381
 382 static int _has_mmx = 0;  // used by layer2.c, layer3.c to pre-scale coeffs
 383
 384 /******************************************************************************/
 385 /*           PUBLIC FUNCTIONS                  */
 386 /******************************************************************************/
 387
 388 /* It's hidden from gcc in assembler */
 389 void dct64_MMX(short *, short *, real *);
 390 void dct64_MMX_3dnow(short *, short *, real *);
 391 void dct64_MMX_3dnowex(short *, short *, real *);
 392 void dct64_sse(short *, short *, real *);
 393 void dct64_altivec(real *, real *, real *);
 394 void (*dct64_MMX_func)(short *, short *, real *);
 395
 396 #include "layer2.c"
 397 #include "layer3.c"
 398 #include "layer1.c"
 399
 400 #include "cpudetect.h"
 401
 402 // Init decoder tables.  Call first, once!
 403 #ifdef CONFIG_FAKE_MONO
 404 void MP3_Init(int fakemono){
 405 #else
 406 void MP3_Init(void){
 407 #endif
 408
 409 //gCpuCaps.hasMMX=gCpuCaps.hasMMX2=gCpuCaps.hasSSE=0; // for testing!
 410
 411     _has_mmx = 0;
 412     dct36_func = dct36;
 413
 414     make_decode_tables(outscale);
 415
 416 #if HAVE_MMX
 417     if (gCpuCaps.hasMMX)
 418     {
 419         _has_mmx = 1;
 420         synth_func = synth_1to1_MMX;
 421     }
 422 #endif
 423
 424 #if HAVE_AMD3DNOWEXT
 425     if (gCpuCaps.has3DNowExt)
 426     {
 427         dct36_func=dct36_3dnowex;
 428         dct64_MMX_func= dct64_MMX_3dnowex;
 429         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using 3DNow!Ex optimized decore!\n");
 430     }
 431     else
 432 #endif
 433 #if HAVE_AMD3DNOW
 434     if (gCpuCaps.has3DNow)
 435     {
 436         dct36_func = dct36_3dnow;
 437         dct64_MMX_func = dct64_MMX_3dnow;
 438         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using 3DNow! optimized decore!\n");
 439     }
 440     else
 441 #endif
 442 #if HAVE_SSE
 443     if (gCpuCaps.hasSSE)
 444     {
 445         dct64_MMX_func = dct64_sse;
 446         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using SSE optimized decore!\n");
 447     }
 448     else
 449 #endif
 450 #if ARCH_X86_32
 451 #if HAVE_MMX
 452     if (gCpuCaps.hasMMX)
 453     {
 454         dct64_MMX_func = dct64_MMX;
 455         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using MMX optimized decore!\n");
 456     }
 457     else
 458 #endif
 459     if (gCpuCaps.cpuType >= CPUTYPE_I586)
 460     {
 461         synth_func = synth_1to1_pent;
 462         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using Pentium optimized decore!\n");
 463     }
 464     else
 465 #endif /* ARCH_X86_32 */
 466 #if HAVE_ALTIVEC
 467     if (gCpuCaps.hasAltiVec)
 468     {
 469         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using AltiVec optimized decore!\n");
 470     }
 471     else
 472 #endif
 473     {
 474         synth_func = NULL; /* use default c version */
 475         mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using generic C decore!\n");
 476     }
 477
 478 #ifdef CONFIG_FAKE_MONO
 479     if (fakemono == 1)
 480         fr.synth=synth_1to1_l;
 481     else if (fakemono == 2)
 482         fr.synth=synth_1to1_r;
 483     else
 484         fr.synth=synth_1to1;
 485 #else
 486     fr.synth=synth_1to1;
 487 #endif
 488     fr.synth_mono=synth_1to1_mono2stereo;
 489     fr.down_sample=0;
 490     fr.down_sample_sblimit = SBLIMIT>>(fr.down_sample);
 491
 492     init_layer2();
 493     init_layer3(fr.down_sample_sblimit);
 494     mp_msg(MSGT_DECAUDIO,MSGL_V,"MP3lib: init layer2&3 finished, tables done\n");
 495 }
 496
 497 #if 0
 498
 499 void MP3_Close(void){
 500   MP3_eof=1;
 501   if(mp3_file) fclose(mp3_file);
 502   mp3_file=NULL;
 503 }
 504
 505 // Open a file, init buffers. Call once per file!
 506 int MP3_Open(char *filename,int buffsize){
 507   MP3_eof=1;   // lock decoding
 508   MP3_pause=1; // lock playing
 509   if(mp3_file) MP3_Close(); // close prev. file
 510   MP3_frames=0;
 511
 512   mp3_file=fopen(filename,"rb");
 513 //  printf("MP3_Open: file='%s'",filename);
 514 //  if(!mp3_file){ printf(" not found!\n"); return 0;} else printf("Ok!\n");
 515   if(!mp3_file) return 0;
 516
 517   MP3_filesize=MP3_PrintTAG();
 518   fseek(mp3_file,0,SEEK_SET);
 519
 520   MP3_InitBuffers(buffsize);
 521   if(!tables_done_flag) MP3_Init();
 522   MP3_eof=0;  // allow decoding
 523   MP3_pause=0; // allow playing
 524   return MP3_filesize;
 525 }
 526
 527 #endif
 528
 529 // Read & decode a single frame. Called by sound driver.
 530 int MP3_DecodeFrame(unsigned char *hova,short single){
 531    pcm_sample = hova;
 532    pcm_point = 0;
 533    if(!read_frame(&fr)) return 0;
 534    if(single==-2){ set_pointer(512); return 1; }
 535    if(fr.error_protection) getbits(16); /* skip crc */
 536    fr.single=single;
 537    switch(fr.lay){
 538      case 2: do_layer2(&fr,single);break;
 539      case 3: do_layer3(&fr,single);break;
 540      case 1: do_layer1(&fr,single);break;
 541      default:
 542          return 0;      // unsupported
 543    }
 544 //   ++MP3_frames;
 545    return pcm_point ? pcm_point : 2;
 546 }
 547
 548 // Prints last frame header in ascii.
 549 void MP3_PrintHeader(void){
 550         static char *modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" };
 551         static char *layers[4] = { "???" , "I", "II", "III" };
 552
 553         mp_msg(MSGT_DECAUDIO,MSGL_V,"\rMPEG %s, Layer %s, %d Hz %d kbit %s, BPF: %d\n",
 554                 fr.mpeg25 ? "2.5" : (fr.lsf ? "2.0" : "1.0"),
 555                 layers[fr.lay],freqs[fr.sampling_frequency],
 556     tabsel_123[fr.lsf][fr.lay-1][fr.bitrate_index],
 557                 modes[fr.mode],fr.framesize+4);
 558         mp_msg(MSGT_DECAUDIO,MSGL_V,"Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d\n",
 559                 fr.stereo,fr.copyright?"Yes":"No",
 560                 fr.original?"Yes":"No",fr.error_protection?"Yes":"No",
 561                 fr.emphasis);
 562 }
 563
 564 #if 0
 565 #include "genre.h"
 566
 567 // Read & print ID3 TAG. Do not call when playing!!!  returns filesize.
 568 int MP3_PrintTAG(void){
 569         struct id3tag {
 570                 char tag[3];
 571                 char title[30];
 572                 char artist[30];
 573                 char album[30];
 574                 char year[4];
 575                 char comment[30];
 576                 unsigned char genre;
 577         };
 578         struct id3tag tag;
 579         char title[31]={0,};
 580         char artist[31]={0,};
 581         char album[31]={0,};
 582         char year[5]={0,};
 583         char comment[31]={0,};
 584         char genre[31]={0,};
 585   int fsize;
 586   int ret;
 587
 588   fseek(mp3_file,0,SEEK_END);
 589   fsize=ftell(mp3_file);
 590   if(fseek(mp3_file,-128,SEEK_END)) return fsize;
 591   ret=fread(&tag,128,1,mp3_file);
 592   if(ret!=1 || tag.tag[0]!='T' || tag.tag[1]!='A' || tag.tag[2]!='G') return fsize;
 593
 594         strncpy(title,tag.title,30);
 595         strncpy(artist,tag.artist,30);
 596         strncpy(album,tag.album,30);
 597         strncpy(year,tag.year,4);
 598         strncpy(comment,tag.comment,30);
 599
 600         if ( tag.genre <= sizeof(genre_table)/sizeof(*genre_table) ) {
 601                 strncpy(genre, genre_table[tag.genre], 30);
 602         } else {
 603                 strncpy(genre,"Unknown",30);
 604         }
 605
 606 //      printf("\n");
 607         printf("Title  : %30s  Artist: %s\n",title,artist);
 608         printf("Album  : %30s  Year  : %4s\n",album,year);
 609         printf("Comment: %30s  Genre : %s\n",comment,genre);
 610         printf("\n");
 611   return fsize-128;
 612 }
 613
 614 #endif