ra144.c 12.5 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
/*
 * Real Audio 1.0 (14.4K)
 * Copyright (c) 2003 the ffmpeg project
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "avcodec.h"
21
#include "ra144.h"
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426

#define DATABLOCK1	20			/* size of 14.4 input block in bytes */
#define DATACHUNK1	1440			/* size of 14.4 input chunk in bytes */
#define AUDIOBLOCK	160			/* size of output block in 16-bit words (320 bytes) */
#define AUDIOBUFFER	12288			/* size of output buffer in 16-bit words (24576 bytes) */
/* consts */
#define NBLOCKS		4				/* number of segments within a block */
#define BLOCKSIZE	40				/* (quarter) block size in 16-bit words (80 bytes) */
#define HALFBLOCK	20				/* BLOCKSIZE/2 */
#define BUFFERSIZE	146				/* for do_output */


/* internal globals */
typedef struct {
	unsigned int	 resetflag, val, oldval;
	unsigned int	 unpacked[28];		/* buffer for unpacked input */
	unsigned int	*iptr;				/* pointer to current input (from unpacked) */
	unsigned int	 gval;
	unsigned short	*gsp;
	unsigned int	 gbuf1[8];
	unsigned short	 gbuf2[120];
	signed   short	 output_buffer[40];
	unsigned int	*decptr;			/* decoder ptr */
	signed   short	*decsp;

	/* the swapped buffers */
	unsigned int	 swapb1a[10];
	unsigned int	 swapb2a[10];
	unsigned int	 swapb1b[10];
	unsigned int	 swapb2b[10];
	unsigned int	*swapbuf1;
	unsigned int	*swapbuf2;
	unsigned int	*swapbuf1alt;
	unsigned int	*swapbuf2alt;

	unsigned int buffer[5];
	unsigned short int buffer_2[148];
	unsigned short int buffer_a[40];
	unsigned short int buffer_b[40];
	unsigned short int buffer_c[40];
	unsigned short int buffer_d[40];

	unsigned short int work[50];
	unsigned short *sptr;

	int buffer1[10];
	int buffer2[10];

	signed short wavtable1[2304];
	unsigned short wavtable2[2304];
} Real144_internal;

static int ra144_decode_init(AVCodecContext * avctx)
{
	Real144_internal *glob=avctx->priv_data;

	memset(glob,0,sizeof(Real144_internal));
	glob->resetflag=1;
	glob->swapbuf1=glob->swapb1a;
	glob->swapbuf2=glob->swapb2a;
	glob->swapbuf1alt=glob->swapb1b;
	glob->swapbuf2alt=glob->swapb2b;

	memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1));
	memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2));

	return 0;
}

static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len);
static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest);
static int irms(short *data, int factor);
static void rotate_block(short *source, short *target, int offset);
/* lookup square roots in table */
static int t_sqrt(unsigned int x)
{
  int s=0;
  while (x>0xfff) { s++; x=x>>2; }
  return (sqrt_table[x]<<s)<<2;
}

/* do 'voice' */
static void do_voice(int *a1, int *a2)
{
  int buffer[10];
  int *b1,*b2;
  int x,y;
  int *ptr,*tmp;
  
  b1=buffer;
  b2=a2;
  
  for (x=0;x<10;x++) {
    b1[x]=(*a1)<<4;

    if(x>0) {
      ptr=b2+x;
      for (y=0;y<=x-1;y++)
        b1[y]=(((*a1)*(*(--ptr)))>>12)+b2[y];
    }
    tmp=b1;
    b1=b2;
    b2=tmp;
    a1++;
  }  
  ptr=a2+10;
  while (ptr>a2) (*a2++)>>=4;
}


/* do quarter-block output */
static void do_output_subblock(Real144_internal *glob, int x)
{
  int a,b,c,d,e,f,g;

  if (x==1) memset(glob->buffer,0,20);
  if ((*glob->iptr)==0) a=0;
  else a=(*glob->iptr)+HALFBLOCK-1;
  glob->iptr++;
  b=*(glob->iptr++);
  c=*(glob->iptr++);
  d=*(glob->iptr++);
  if (a) rotate_block(glob->buffer_2,glob->buffer_a,a);
  memcpy(glob->buffer_b,etable1+b*BLOCKSIZE,BLOCKSIZE*2);
  e=((ftable1[b]>>4)*glob->gval)>>8;
  memcpy(glob->buffer_c,etable2+c*BLOCKSIZE,BLOCKSIZE*2);
  f=((ftable2[c]>>4)*glob->gval)>>8;
  if (a) g=irms(glob->buffer_a,glob->gval)>>12;
  else g=0;
  add_wav(glob,d,a,g,e,f,glob->buffer_a,glob->buffer_b,glob->buffer_c,glob->buffer_d);
  memmove(glob->buffer_2,glob->buffer_2+BLOCKSIZE,(BUFFERSIZE-BLOCKSIZE)*2);
  memcpy(glob->buffer_2+BUFFERSIZE-BLOCKSIZE,glob->buffer_d,BLOCKSIZE*2);
  final(glob,glob->gsp,glob->buffer_d,glob->output_buffer,glob->buffer,BLOCKSIZE);
}

/* rotate block */
static void rotate_block(short *source, short *target, int offset)
{
  short *end;
  short *ptr1;
  short *ptr2;
  short *ptr3;
  ptr2=source+BUFFERSIZE;
  ptr3=ptr1=ptr2-offset;
  end=target+BLOCKSIZE;
  while (target<end) {
    *(target++)=*(ptr3++);
    if (ptr3==ptr2) ptr3=ptr1;
  }
}

/* inverse root mean square */
static int irms(short *data, int factor)
{
  short *p1,*p2;
  unsigned int sum;
  p2=(p1=data)+BLOCKSIZE;
  for (sum=0;p2>p1;p1++) sum+=(*p1)*(*p1);
  if (sum==0) return 0; /* OOPS - division by zero */
  return (0x20000000/(t_sqrt(sum)>>8))*factor;
}

/* multiply/add wavetable */
static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest)
{
  int a,b,c;
  short *ptr,*ptr2;

  ptr=glob->wavtable1+n*9;
  ptr2=glob->wavtable2+n*9;
  if (f!=0) {
    a=((*ptr)*m1)>>((*ptr2)+1); 
  } else {
    a=0;
  }
  ptr++;ptr2++;
  b=((*ptr)*m2)>>((*ptr2)+1);
  ptr++;ptr2++;
  c=((*ptr)*m3)>>((*ptr2)+1);
  ptr2=(ptr=dest)+BLOCKSIZE;
  if (f!=0)
    while (ptr<ptr2)
      *(ptr++)=((*(s1++))*a+(*(s2++))*b+(*(s3++))*c)>>12;
  else
    while (ptr<ptr2)
      *(ptr++)=((*(s2++))*b+(*(s3++))*c)>>12;
}


static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len)
{
  int x,sum;
  int buffer[10];
  short *ptr;
  short *ptr2;

  memcpy(glob->work,statbuf,20);
  memcpy(glob->work+10,i2,len*2);

  buffer[9]=i1[0];
  buffer[8]=i1[1];
  buffer[7]=i1[2];
  buffer[6]=i1[3];
  buffer[5]=i1[4];
  buffer[4]=i1[5];
  buffer[3]=i1[6];
  buffer[2]=i1[7];
  buffer[1]=i1[8];
  buffer[0]=i1[9];

  ptr2=(ptr=glob->work)+len;
  while (ptr<ptr2) {
    for(sum=0,x=0;x<=9;x++)
      sum+=buffer[x]*(ptr[x]);
    sum=sum>>12;
    x=ptr[10]-sum;
    if (x<-32768 || x>32767)
    {
      memset(out,0,len*2);
      memset(statbuf,0,20);
      return;
    }
    ptr[10]=x;
    ptr++;
  }
  memcpy(out,ptr+10-len,len*2);
  memcpy(statbuf,ptr,20);
}

/* Decode 20-byte input */
static void unpack_input(unsigned char *input, unsigned int *output)
{
  unsigned int outbuffer[28];
  unsigned short inbuffer[10];
  unsigned int x;
  unsigned int *ptr;

  /* fix endianness */
  for (x=0;x<20;x+=2)
    inbuffer[x/2]=(input[x]<<8)+input[x+1];

  /* unpack */
  ptr=outbuffer;
  *(ptr++)=27;
  *(ptr++)=(inbuffer[0]>>10)&0x3f;
  *(ptr++)=(inbuffer[0]>>5)&0x1f;
  *(ptr++)=inbuffer[0]&0x1f;
  *(ptr++)=(inbuffer[1]>>12)&0xf;
  *(ptr++)=(inbuffer[1]>>8)&0xf;
  *(ptr++)=(inbuffer[1]>>5)&7;
  *(ptr++)=(inbuffer[1]>>2)&7;
  *(ptr++)=((inbuffer[1]<<1)&6)|((inbuffer[2]>>15)&1);
  *(ptr++)=(inbuffer[2]>>12)&7;
  *(ptr++)=(inbuffer[2]>>10)&3;
  *(ptr++)=(inbuffer[2]>>5)&0x1f;
  *(ptr++)=((inbuffer[2]<<2)&0x7c)|((inbuffer[3]>>14)&3);
  *(ptr++)=(inbuffer[3]>>6)&0xff;
  *(ptr++)=((inbuffer[3]<<1)&0x7e)|((inbuffer[4]>>15)&1);
  *(ptr++)=(inbuffer[4]>>8)&0x7f;
  *(ptr++)=(inbuffer[4]>>1)&0x7f;
  *(ptr++)=((inbuffer[4]<<7)&0x80)|((inbuffer[5]>>9)&0x7f);
  *(ptr++)=(inbuffer[5]>>2)&0x7f;
  *(ptr++)=((inbuffer[5]<<5)&0x60)|((inbuffer[6]>>11)&0x1f);
  *(ptr++)=(inbuffer[6]>>4)&0x7f;
  *(ptr++)=((inbuffer[6]<<4)&0xf0)|((inbuffer[7]>>12)&0xf);
  *(ptr++)=(inbuffer[7]>>5)&0x7f;
  *(ptr++)=((inbuffer[7]<<2)&0x7c)|((inbuffer[8]>>14)&3);
  *(ptr++)=(inbuffer[8]>>7)&0x7f;
  *(ptr++)=((inbuffer[8]<<1)&0xfe)|((inbuffer[9]>>15)&1);
  *(ptr++)=(inbuffer[9]>>8)&0x7f;
  *(ptr++)=(inbuffer[9]>>1)&0x7f;

  *(output++)=outbuffer[11];
  for (x=1;x<11;*(output++)=outbuffer[x++]);
  ptr=outbuffer+12;
  for (x=0;x<16;x+=4)
  {
    *(output++)=ptr[x];
    *(output++)=ptr[x+2];
    *(output++)=ptr[x+3];
    *(output++)=ptr[x+1];    
  }
}

static unsigned int rms(int *data, int f)
{
  int *c;
  int x;
  unsigned int res;
  int b;

  c=data;
  b=0;
  res=0x10000;
  for (x=0;x<10;x++)
  {
    res=(((0x1000000-(*c)*(*c))>>12)*res)>>12;
    if (res==0) return 0;
    if (res<=0x3fff)
    {
      while (res<=0x3fff)
      {
        b++;
        res<<=2;
      }
    } else {
      if (res>0x10000)
        return 0; /* We're screwed, might as well go out with a bang. :P */
    }
    c++;
  }
  if (res>0) res=t_sqrt(res);

  res>>=(b+10);
  res=(res*f)>>10;
  return res;
}

static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
{
  short *ptr,*end;

  *(glob->decptr++)=rms(data,f);
  glob->decptr++;
  end=(ptr=glob->decsp)+(n*10);
  while (ptr<end) *(ptr++)=*(inp++);
}

static int eq(Real144_internal *glob, short *in, int *target)
{
  int retval;
  int a;
  int b;
  int c;
  unsigned int u;
  short *sptr;
  int *ptr1,*ptr2,*ptr3;
  int *bp1,*bp2,*temp;

  retval=0;
  bp1=glob->buffer1;
  bp2=glob->buffer2;
  ptr2=(ptr3=glob->buffer2)+9;
  sptr=in;
  while (ptr2>=ptr3)
    *(ptr3++)=*(sptr++);

  target+=9;
  a=bp2[9];
  *target=a;
  if (a+0x1000>0x1fff)
    return 0; /* We're screwed, might as well go out with a bang. :P */
  c=8;u=a;
  while (c>=0)
  {
    if (u==0x1000) u++;
    if (u==0xfffff000) u--;
    b=0x1000-((u*u)>>12);
    if (b==0) b++;
    ptr2=bp1;
    ptr1=(ptr3=bp2)+c;
    for (u=0;u<=c;u++)
      *(ptr2++)=((*(ptr3++)-(((*target)*(*(ptr1--)))>>12))*(0x1000000/b))>>12;
    *(--target)=u=bp1[(c--)];
    if ((u+0x1000)>0x1fff) retval=1;
    temp=bp2;
    bp2=bp1;
    bp1=temp;
  }
  return retval;
}

static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f, int *inp2, int l)
{
  unsigned int *ptr1,*ptr2;
  int work[10];
  int a,b;
  int x;
  int result;

  if(l+1<NBLOCKS/2) a=NBLOCKS-(l+1);
  else a=l+1;
  b=NBLOCKS-a;
  if (l==0)
  {
    glob->decsp=glob->sptr=glob->gbuf2;
    glob->decptr=glob->gbuf1;
  }
  ptr1=inp;
  ptr2=inp2;
  for (x=0;x<10*n;x++)
    *(glob->sptr++)=(a*(*ptr1++)+b*(*ptr2++))>>2;
  result=eq(glob,glob->decsp,work);
  if (result==1)
  {
    dec1(glob,data,inp,n,f);
  } else {
    *(glob->decptr++)=rms(work,f);
    glob->decptr++;
  }
  glob->decsp+=n*10;
}

/* Uncompress one block (20 bytes -> 160*2 bytes) */
static int ra144_decode_frame(AVCodecContext * avctx,
427
            void *vdata, int *data_size,
428 429 430 431 432 433 434
            uint8_t * buf, int buf_size)
{
  unsigned int a,b,c;
  long s;
  signed short *shptr;
  unsigned int *lptr,*temp;
  const short **dptr;
435 436
  int16_t *datao;
  int16_t *data = vdata;
437 438
  Real144_internal *glob=avctx->priv_data;

Michael Niedermayer's avatar
Michael Niedermayer committed
439 440 441
  if(buf_size==0)
      return 0;
  
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486
  datao = data;
  unpack_input(buf,glob->unpacked);
  
  glob->iptr=glob->unpacked;
  glob->val=decodetable[0][(*(glob->iptr++))<<1];

  dptr=decodetable+1;
  lptr=glob->swapbuf1;
  while (lptr<glob->swapbuf1+10)
    *(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1];

  do_voice(glob->swapbuf1,glob->swapbuf2);

  a=t_sqrt(glob->val*glob->oldval)>>12;

  for (c=0;c<NBLOCKS;c++) {
    if (c==(NBLOCKS-1)) {
      dec1(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val);
    } else {
      if (c*2==(NBLOCKS-2)) {
        if (glob->oldval<glob->val) {
          dec2(glob,glob->swapbuf1,glob->swapbuf2,3,a,glob->swapbuf2alt,c);
        } else {
          dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,a,glob->swapbuf2,c);
        }
      } else {
        if (c*2<(NBLOCKS-2)) {
          dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,glob->oldval,glob->swapbuf2,c);
        } else {
          dec2(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val,glob->swapbuf2alt,c);
        }
      }
    }
  }

  /* do output */
  for (b=0,c=0;c<4;c++) {
    glob->gval=glob->gbuf1[c*2];
    glob->gsp=glob->gbuf2+b;
    do_output_subblock(glob,glob->resetflag);
    glob->resetflag=0;

    shptr=glob->output_buffer;
    while (shptr<glob->output_buffer+BLOCKSIZE) {
      s=*(shptr++)<<2;
487 488 489 490
      *data=s;
      if (s>32767) *data=32767;
      if (s<-32767) *data=-32768;
      data++;
491 492 493 494 495 496 497 498 499 500 501
    }
    b+=30;
  }

  glob->oldval=glob->val;
  temp=glob->swapbuf1alt;
  glob->swapbuf1alt=glob->swapbuf1;
  glob->swapbuf1=temp;
  temp=glob->swapbuf2alt;
  glob->swapbuf2alt=glob->swapbuf2;
  glob->swapbuf2=temp;
502
  *data_size=(data-datao)*sizeof(*data);
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517
  return 20;
}


AVCodec ra_144_decoder =
{
    "real_144",
    CODEC_TYPE_AUDIO,
    CODEC_ID_RA_144,
    sizeof(Real144_internal),
    ra144_decode_init,
    NULL,
    NULL,
    ra144_decode_frame,
};