2 * Real Audio 1.0 (14.4K)
3 * Copyright (c) 2003 the ffmpeg project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #define DATABLOCK1 20 /* size of 14.4 input block in bytes */
26 #define DATACHUNK1 1440 /* size of 14.4 input chunk in bytes */
27 #define AUDIOBLOCK 160 /* size of output block in 16-bit words (320 bytes) */
28 #define AUDIOBUFFER 12288 /* size of output buffer in 16-bit words (24576 bytes) */
30 #define NBLOCKS 4 /* number of segments within a block */
31 #define BLOCKSIZE 40 /* (quarter) block size in 16-bit words (80 bytes) */
32 #define HALFBLOCK 20 /* BLOCKSIZE/2 */
33 #define BUFFERSIZE 146 /* for do_output */
36 /* internal globals */
38 unsigned int resetflag, val, oldval;
39 unsigned int unpacked[28]; /* buffer for unpacked input */
40 unsigned int *iptr; /* pointer to current input (from unpacked) */
43 unsigned int gbuf1[8];
44 unsigned short gbuf2[120];
45 signed short output_buffer[40];
46 unsigned int *decptr; /* decoder ptr */
49 /* the swapped buffers */
50 unsigned int swapb1a[10];
51 unsigned int swapb2a[10];
52 unsigned int swapb1b[10];
53 unsigned int swapb2b[10];
54 unsigned int *swapbuf1;
55 unsigned int *swapbuf2;
56 unsigned int *swapbuf1alt;
57 unsigned int *swapbuf2alt;
59 unsigned int buffer[5];
60 unsigned short int buffer_2[148];
61 unsigned short int buffer_a[40];
62 unsigned short int buffer_b[40];
63 unsigned short int buffer_c[40];
64 unsigned short int buffer_d[40];
66 unsigned short int work[50];
72 signed short wavtable1[2304];
73 unsigned short wavtable2[2304];
76 static int ra144_decode_init(AVCodecContext * avctx)
78 Real144_internal *glob=avctx->priv_data;
80 memset(glob,0,sizeof(Real144_internal));
82 glob->swapbuf1=glob->swapb1a;
83 glob->swapbuf2=glob->swapb2a;
84 glob->swapbuf1alt=glob->swapb1b;
85 glob->swapbuf2alt=glob->swapb2b;
87 memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1));
88 memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2));
93 static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len);
94 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);
95 static int irms(short *data, int factor);
96 static void rotate_block(short *source, short *target, int offset);
97 /* lookup square roots in table */
98 static int t_sqrt(unsigned int x)
101 while (x>0xfff) { s++; x=x>>2; }
102 return (sqrt_table[x]<<s)<<2;
106 static void do_voice(int *a1, int *a2)
122 b1[y]=(((*a1)*(*(--ptr)))>>12)+b2[y];
130 while (ptr>a2) (*a2++)>>=4;
134 /* do quarter-block output */
135 static void do_output_subblock(Real144_internal *glob, unsigned int x)
139 if (x==1) memset(glob->buffer,0,20);
140 if ((*glob->iptr)==0) a=0;
141 else a=(*glob->iptr)+HALFBLOCK-1;
146 if (a) rotate_block(glob->buffer_2,glob->buffer_a,a);
147 memcpy(glob->buffer_b,etable1+b*BLOCKSIZE,BLOCKSIZE*2);
148 e=((ftable1[b]>>4)*glob->gval)>>8;
149 memcpy(glob->buffer_c,etable2+c*BLOCKSIZE,BLOCKSIZE*2);
150 f=((ftable2[c]>>4)*glob->gval)>>8;
151 if (a) g=irms(glob->buffer_a,glob->gval)>>12;
153 add_wav(glob,d,a,g,e,f,glob->buffer_a,glob->buffer_b,glob->buffer_c,glob->buffer_d);
154 memmove(glob->buffer_2,glob->buffer_2+BLOCKSIZE,(BUFFERSIZE-BLOCKSIZE)*2);
155 memcpy(glob->buffer_2+BUFFERSIZE-BLOCKSIZE,glob->buffer_d,BLOCKSIZE*2);
156 final(glob,glob->gsp,glob->buffer_d,glob->output_buffer,glob->buffer,BLOCKSIZE);
160 static void rotate_block(short *source, short *target, int offset)
166 ptr2=source+BUFFERSIZE;
167 ptr3=ptr1=ptr2-offset;
168 end=target+BLOCKSIZE;
170 *(target++)=*(ptr3++);
171 if (ptr3==ptr2) ptr3=ptr1;
175 /* inverse root mean square */
176 static int irms(short *data, int factor)
180 p2=(p1=data)+BLOCKSIZE;
181 for (sum=0;p2>p1;p1++) sum+=(*p1)*(*p1);
182 if (sum==0) return 0; /* OOPS - division by zero */
183 return (0x20000000/(t_sqrt(sum)>>8))*factor;
186 /* multiply/add wavetable */
187 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)
192 ptr=glob->wavtable1+n*9;
193 ptr2=glob->wavtable2+n*9;
195 a=((*ptr)*m1)>>((*ptr2)+1);
200 b=((*ptr)*m2)>>((*ptr2)+1);
202 c=((*ptr)*m3)>>((*ptr2)+1);
203 ptr2=(ptr=dest)+BLOCKSIZE;
206 *(ptr++)=((*(s1++))*a+(*(s2++))*b+(*(s3++))*c)>>12;
209 *(ptr++)=((*(s2++))*b+(*(s3++))*c)>>12;
213 static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len)
220 memcpy(glob->work,statbuf,20);
221 memcpy(glob->work+10,i2,len*2);
234 ptr2=(ptr=glob->work)+len;
236 for(sum=0,x=0;x<=9;x++)
237 sum+=buffer[x]*(ptr[x]);
240 if (x<-32768 || x>32767)
243 memset(statbuf,0,20);
249 memcpy(out,ptr+10-len,len*2);
250 memcpy(statbuf,ptr,20);
253 /* Decode 20-byte input */
254 static void unpack_input(unsigned char *input, unsigned int *output)
256 unsigned int outbuffer[28];
257 unsigned short inbuffer[10];
263 inbuffer[x/2]=(input[x]<<8)+input[x+1];
268 *(ptr++)=(inbuffer[0]>>10)&0x3f;
269 *(ptr++)=(inbuffer[0]>>5)&0x1f;
270 *(ptr++)=inbuffer[0]&0x1f;
271 *(ptr++)=(inbuffer[1]>>12)&0xf;
272 *(ptr++)=(inbuffer[1]>>8)&0xf;
273 *(ptr++)=(inbuffer[1]>>5)&7;
274 *(ptr++)=(inbuffer[1]>>2)&7;
275 *(ptr++)=((inbuffer[1]<<1)&6)|((inbuffer[2]>>15)&1);
276 *(ptr++)=(inbuffer[2]>>12)&7;
277 *(ptr++)=(inbuffer[2]>>10)&3;
278 *(ptr++)=(inbuffer[2]>>5)&0x1f;
279 *(ptr++)=((inbuffer[2]<<2)&0x7c)|((inbuffer[3]>>14)&3);
280 *(ptr++)=(inbuffer[3]>>6)&0xff;
281 *(ptr++)=((inbuffer[3]<<1)&0x7e)|((inbuffer[4]>>15)&1);
282 *(ptr++)=(inbuffer[4]>>8)&0x7f;
283 *(ptr++)=(inbuffer[4]>>1)&0x7f;
284 *(ptr++)=((inbuffer[4]<<7)&0x80)|((inbuffer[5]>>9)&0x7f);
285 *(ptr++)=(inbuffer[5]>>2)&0x7f;
286 *(ptr++)=((inbuffer[5]<<5)&0x60)|((inbuffer[6]>>11)&0x1f);
287 *(ptr++)=(inbuffer[6]>>4)&0x7f;
288 *(ptr++)=((inbuffer[6]<<4)&0xf0)|((inbuffer[7]>>12)&0xf);
289 *(ptr++)=(inbuffer[7]>>5)&0x7f;
290 *(ptr++)=((inbuffer[7]<<2)&0x7c)|((inbuffer[8]>>14)&3);
291 *(ptr++)=(inbuffer[8]>>7)&0x7f;
292 *(ptr++)=((inbuffer[8]<<1)&0xfe)|((inbuffer[9]>>15)&1);
293 *(ptr++)=(inbuffer[9]>>8)&0x7f;
294 *(ptr++)=(inbuffer[9]>>1)&0x7f;
296 *(output++)=outbuffer[11];
297 for (x=1;x<11;*(output++)=outbuffer[x++]);
302 *(output++)=ptr[x+2];
303 *(output++)=ptr[x+3];
304 *(output++)=ptr[x+1];
308 static unsigned int rms(int *data, int f)
320 res=(((0x1000000-(*c)*(*c))>>12)*res)>>12;
321 if (res==0) return 0;
331 return 0; /* We're screwed, might as well go out with a bang. :P */
335 if (res>0) res=t_sqrt(res);
342 static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
346 *(glob->decptr++)=rms(data,f);
348 end=(ptr=glob->decsp)+(n*10);
349 while (ptr<end) *(ptr++)=*(inp++);
352 static int eq(Real144_internal *glob, short *in, int *target)
360 int *ptr1,*ptr2,*ptr3;
366 ptr2=(ptr3=glob->buffer2)+9;
375 return 0; /* We're screwed, might as well go out with a bang. :P */
380 if (u==0xfffff000) u--;
381 b=0x1000-((u*u)>>12);
386 *(ptr2++)=((*(ptr3++)-(((*target)*(*(ptr1--)))>>12))*(0x1000000/b))>>12;
387 *(--target)=u=bp1[(c--)];
388 if ((u+0x1000)>0x1fff) retval=1;
396 static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f, int *inp2, int l)
398 unsigned int *ptr1,*ptr2;
404 if(l+1<NBLOCKS/2) a=NBLOCKS-(l+1);
409 glob->decsp=glob->sptr=glob->gbuf2;
410 glob->decptr=glob->gbuf1;
415 *(glob->sptr++)=(a*(*ptr1++)+b*(*ptr2++))>>2;
416 result=eq(glob,glob->decsp,work);
419 dec1(glob,data,inp,n,f);
421 *(glob->decptr++)=rms(work,f);
427 /* Uncompress one block (20 bytes -> 160*2 bytes) */
428 static int ra144_decode_frame(AVCodecContext * avctx,
429 void *vdata, int *data_size,
430 uint8_t * buf, int buf_size)
434 unsigned int *lptr,*temp;
437 int16_t *data = vdata;
438 Real144_internal *glob=avctx->priv_data;
444 unpack_input(buf,glob->unpacked);
446 glob->iptr=glob->unpacked;
447 glob->val=decodetable[0][(*(glob->iptr++))<<1];
451 while (lptr<glob->swapbuf1+10)
452 *(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1];
454 do_voice(glob->swapbuf1,glob->swapbuf2);
456 a=t_sqrt(glob->val*glob->oldval)>>12;
458 for (c=0;c<NBLOCKS;c++) {
459 if (c==(NBLOCKS-1)) {
460 dec1(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val);
462 if (c*2==(NBLOCKS-2)) {
463 if (glob->oldval<glob->val) {
464 dec2(glob,glob->swapbuf1,glob->swapbuf2,3,a,glob->swapbuf2alt,c);
466 dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,a,glob->swapbuf2,c);
469 if (c*2<(NBLOCKS-2)) {
470 dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,glob->oldval,glob->swapbuf2,c);
472 dec2(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val,glob->swapbuf2alt,c);
479 for (b=0,c=0;c<4;c++) {
480 glob->gval=glob->gbuf1[c*2];
481 glob->gsp=glob->gbuf2+b;
482 do_output_subblock(glob,glob->resetflag);
485 shptr=glob->output_buffer;
486 while (shptr<glob->output_buffer+BLOCKSIZE)
487 *data++=av_clip_int16(*(shptr++)<<2);
491 glob->oldval=glob->val;
492 temp=glob->swapbuf1alt;
493 glob->swapbuf1alt=glob->swapbuf1;
495 temp=glob->swapbuf2alt;
496 glob->swapbuf2alt=glob->swapbuf2;
498 *data_size=(data-datao)*sizeof(*data);
503 AVCodec ra_144_decoder =
508 sizeof(Real144_internal),