518 lines
13 KiB
C
518 lines
13 KiB
C
/*
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* Real Audio 1.0 (14.4K)
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* Copyright (c) 2003 the ffmpeg project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "ra144.h"
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#define DATABLOCK1 20 /* size of 14.4 input block in bytes */
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#define DATACHUNK1 1440 /* size of 14.4 input chunk in bytes */
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#define AUDIOBLOCK 160 /* size of output block in 16-bit words (320 bytes) */
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#define AUDIOBUFFER 12288 /* size of output buffer in 16-bit words (24576 bytes) */
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/* consts */
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#define NBLOCKS 4 /* number of segments within a block */
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#define BLOCKSIZE 40 /* (quarter) block size in 16-bit words (80 bytes) */
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#define HALFBLOCK 20 /* BLOCKSIZE/2 */
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#define BUFFERSIZE 146 /* for do_output */
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/* internal globals */
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typedef struct {
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unsigned int resetflag, val, oldval;
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unsigned int unpacked[28]; /* buffer for unpacked input */
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unsigned int *iptr; /* pointer to current input (from unpacked) */
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unsigned int gval;
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unsigned short *gsp;
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unsigned int gbuf1[8];
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unsigned short gbuf2[120];
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signed short output_buffer[40];
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unsigned int *decptr; /* decoder ptr */
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signed short *decsp;
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/* the swapped buffers */
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unsigned int swapb1a[10];
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unsigned int swapb2a[10];
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unsigned int swapb1b[10];
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unsigned int swapb2b[10];
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unsigned int *swapbuf1;
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unsigned int *swapbuf2;
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unsigned int *swapbuf1alt;
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unsigned int *swapbuf2alt;
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unsigned int buffer[5];
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unsigned short int buffer_2[148];
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unsigned short int buffer_a[40];
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unsigned short int buffer_b[40];
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unsigned short int buffer_c[40];
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unsigned short int buffer_d[40];
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unsigned short int work[50];
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unsigned short *sptr;
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int buffer1[10];
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int buffer2[10];
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signed short wavtable1[2304];
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unsigned short wavtable2[2304];
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} Real144_internal;
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static int ra144_decode_init(AVCodecContext * avctx)
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{
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Real144_internal *glob=avctx->priv_data;
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memset(glob,0,sizeof(Real144_internal));
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glob->resetflag=1;
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glob->swapbuf1=glob->swapb1a;
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glob->swapbuf2=glob->swapb2a;
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glob->swapbuf1alt=glob->swapb1b;
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glob->swapbuf2alt=glob->swapb2b;
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memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1));
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memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2));
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return 0;
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}
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static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len);
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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);
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static int irms(short *data, int factor);
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static void rotate_block(short *source, short *target, int offset);
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/* lookup square roots in table */
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static int t_sqrt(unsigned int x)
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{
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int s=0;
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while (x>0xfff) { s++; x=x>>2; }
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return (sqrt_table[x]<<s)<<2;
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}
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/* do 'voice' */
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static void do_voice(int *a1, int *a2)
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{
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int buffer[10];
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int *b1,*b2;
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int x,y;
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int *ptr,*tmp;
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b1=buffer;
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b2=a2;
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for (x=0;x<10;x++) {
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b1[x]=(*a1)<<4;
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if(x>0) {
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ptr=b2+x;
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for (y=0;y<=x-1;y++)
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b1[y]=(((*a1)*(*(--ptr)))>>12)+b2[y];
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}
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tmp=b1;
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b1=b2;
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b2=tmp;
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a1++;
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}
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ptr=a2+10;
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while (ptr>a2) (*a2++)>>=4;
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}
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/* do quarter-block output */
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static void do_output_subblock(Real144_internal *glob, unsigned int x)
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{
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int a,b,c,d,e,f,g;
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if (x==1) memset(glob->buffer,0,20);
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if ((*glob->iptr)==0) a=0;
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else a=(*glob->iptr)+HALFBLOCK-1;
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glob->iptr++;
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b=*(glob->iptr++);
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c=*(glob->iptr++);
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d=*(glob->iptr++);
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if (a) rotate_block(glob->buffer_2,glob->buffer_a,a);
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memcpy(glob->buffer_b,etable1+b*BLOCKSIZE,BLOCKSIZE*2);
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e=((ftable1[b]>>4)*glob->gval)>>8;
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memcpy(glob->buffer_c,etable2+c*BLOCKSIZE,BLOCKSIZE*2);
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f=((ftable2[c]>>4)*glob->gval)>>8;
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if (a) g=irms(glob->buffer_a,glob->gval)>>12;
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else g=0;
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add_wav(glob,d,a,g,e,f,glob->buffer_a,glob->buffer_b,glob->buffer_c,glob->buffer_d);
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memmove(glob->buffer_2,glob->buffer_2+BLOCKSIZE,(BUFFERSIZE-BLOCKSIZE)*2);
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memcpy(glob->buffer_2+BUFFERSIZE-BLOCKSIZE,glob->buffer_d,BLOCKSIZE*2);
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final(glob,glob->gsp,glob->buffer_d,glob->output_buffer,glob->buffer,BLOCKSIZE);
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}
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/* rotate block */
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static void rotate_block(short *source, short *target, int offset)
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{
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short *end;
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short *ptr1;
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short *ptr2;
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short *ptr3;
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ptr2=source+BUFFERSIZE;
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ptr3=ptr1=ptr2-offset;
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end=target+BLOCKSIZE;
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while (target<end) {
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*(target++)=*(ptr3++);
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if (ptr3==ptr2) ptr3=ptr1;
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}
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}
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/* inverse root mean square */
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static int irms(short *data, int factor)
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{
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short *p1,*p2;
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unsigned int sum;
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p2=(p1=data)+BLOCKSIZE;
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for (sum=0;p2>p1;p1++) sum+=(*p1)*(*p1);
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if (sum==0) return 0; /* OOPS - division by zero */
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return (0x20000000/(t_sqrt(sum)>>8))*factor;
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}
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/* multiply/add wavetable */
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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)
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{
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int a,b,c;
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short *ptr,*ptr2;
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ptr=glob->wavtable1+n*9;
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ptr2=glob->wavtable2+n*9;
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if (f!=0) {
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a=((*ptr)*m1)>>((*ptr2)+1);
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} else {
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a=0;
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}
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ptr++;ptr2++;
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b=((*ptr)*m2)>>((*ptr2)+1);
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ptr++;ptr2++;
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c=((*ptr)*m3)>>((*ptr2)+1);
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ptr2=(ptr=dest)+BLOCKSIZE;
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if (f!=0)
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while (ptr<ptr2)
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*(ptr++)=((*(s1++))*a+(*(s2++))*b+(*(s3++))*c)>>12;
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else
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while (ptr<ptr2)
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*(ptr++)=((*(s2++))*b+(*(s3++))*c)>>12;
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}
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static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len)
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{
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int x,sum;
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int buffer[10];
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short *ptr;
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short *ptr2;
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memcpy(glob->work,statbuf,20);
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memcpy(glob->work+10,i2,len*2);
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buffer[9]=i1[0];
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buffer[8]=i1[1];
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buffer[7]=i1[2];
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buffer[6]=i1[3];
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buffer[5]=i1[4];
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buffer[4]=i1[5];
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buffer[3]=i1[6];
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buffer[2]=i1[7];
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buffer[1]=i1[8];
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buffer[0]=i1[9];
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ptr2=(ptr=glob->work)+len;
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while (ptr<ptr2) {
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for(sum=0,x=0;x<=9;x++)
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sum+=buffer[x]*(ptr[x]);
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sum=sum>>12;
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x=ptr[10]-sum;
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if (x<-32768 || x>32767)
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{
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memset(out,0,len*2);
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memset(statbuf,0,20);
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return;
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}
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ptr[10]=x;
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ptr++;
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}
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memcpy(out,ptr+10-len,len*2);
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memcpy(statbuf,ptr,20);
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}
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/* Decode 20-byte input */
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static void unpack_input(unsigned char *input, unsigned int *output)
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{
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unsigned int outbuffer[28];
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unsigned short inbuffer[10];
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unsigned int x;
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unsigned int *ptr;
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/* fix endianness */
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for (x=0;x<20;x+=2)
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inbuffer[x/2]=(input[x]<<8)+input[x+1];
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/* unpack */
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ptr=outbuffer;
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*(ptr++)=27;
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*(ptr++)=(inbuffer[0]>>10)&0x3f;
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*(ptr++)=(inbuffer[0]>>5)&0x1f;
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*(ptr++)=inbuffer[0]&0x1f;
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*(ptr++)=(inbuffer[1]>>12)&0xf;
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*(ptr++)=(inbuffer[1]>>8)&0xf;
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*(ptr++)=(inbuffer[1]>>5)&7;
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*(ptr++)=(inbuffer[1]>>2)&7;
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*(ptr++)=((inbuffer[1]<<1)&6)|((inbuffer[2]>>15)&1);
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*(ptr++)=(inbuffer[2]>>12)&7;
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*(ptr++)=(inbuffer[2]>>10)&3;
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*(ptr++)=(inbuffer[2]>>5)&0x1f;
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*(ptr++)=((inbuffer[2]<<2)&0x7c)|((inbuffer[3]>>14)&3);
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*(ptr++)=(inbuffer[3]>>6)&0xff;
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*(ptr++)=((inbuffer[3]<<1)&0x7e)|((inbuffer[4]>>15)&1);
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*(ptr++)=(inbuffer[4]>>8)&0x7f;
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*(ptr++)=(inbuffer[4]>>1)&0x7f;
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*(ptr++)=((inbuffer[4]<<7)&0x80)|((inbuffer[5]>>9)&0x7f);
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*(ptr++)=(inbuffer[5]>>2)&0x7f;
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*(ptr++)=((inbuffer[5]<<5)&0x60)|((inbuffer[6]>>11)&0x1f);
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*(ptr++)=(inbuffer[6]>>4)&0x7f;
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*(ptr++)=((inbuffer[6]<<4)&0xf0)|((inbuffer[7]>>12)&0xf);
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*(ptr++)=(inbuffer[7]>>5)&0x7f;
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*(ptr++)=((inbuffer[7]<<2)&0x7c)|((inbuffer[8]>>14)&3);
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*(ptr++)=(inbuffer[8]>>7)&0x7f;
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*(ptr++)=((inbuffer[8]<<1)&0xfe)|((inbuffer[9]>>15)&1);
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*(ptr++)=(inbuffer[9]>>8)&0x7f;
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*(ptr++)=(inbuffer[9]>>1)&0x7f;
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*(output++)=outbuffer[11];
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for (x=1;x<11;*(output++)=outbuffer[x++]);
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ptr=outbuffer+12;
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for (x=0;x<16;x+=4)
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{
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*(output++)=ptr[x];
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*(output++)=ptr[x+2];
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*(output++)=ptr[x+3];
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*(output++)=ptr[x+1];
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}
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}
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static unsigned int rms(int *data, int f)
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{
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int *c;
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int x;
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unsigned int res;
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int b;
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c=data;
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b=0;
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res=0x10000;
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for (x=0;x<10;x++)
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{
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res=(((0x1000000-(*c)*(*c))>>12)*res)>>12;
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if (res==0) return 0;
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if (res<=0x3fff)
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{
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while (res<=0x3fff)
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{
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b++;
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res<<=2;
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}
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} else {
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if (res>0x10000)
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return 0; /* We're screwed, might as well go out with a bang. :P */
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}
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c++;
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}
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if (res>0) res=t_sqrt(res);
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res>>=(b+10);
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res=(res*f)>>10;
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return res;
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}
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static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
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{
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short *ptr,*end;
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*(glob->decptr++)=rms(data,f);
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glob->decptr++;
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end=(ptr=glob->decsp)+(n*10);
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while (ptr<end) *(ptr++)=*(inp++);
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}
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static int eq(Real144_internal *glob, short *in, int *target)
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{
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int retval;
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int a;
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int b;
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int c;
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unsigned int u;
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short *sptr;
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int *ptr1,*ptr2,*ptr3;
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int *bp1,*bp2,*temp;
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retval=0;
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bp1=glob->buffer1;
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bp2=glob->buffer2;
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ptr2=(ptr3=glob->buffer2)+9;
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sptr=in;
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while (ptr2>=ptr3)
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*(ptr3++)=*(sptr++);
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target+=9;
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a=bp2[9];
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*target=a;
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if (a+0x1000>0x1fff)
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return 0; /* We're screwed, might as well go out with a bang. :P */
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c=8;u=a;
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while (c>=0)
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{
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if (u==0x1000) u++;
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if (u==0xfffff000) u--;
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b=0x1000-((u*u)>>12);
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if (b==0) b++;
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ptr2=bp1;
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ptr1=(ptr3=bp2)+c;
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for (u=0;u<=c;u++)
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*(ptr2++)=((*(ptr3++)-(((*target)*(*(ptr1--)))>>12))*(0x1000000/b))>>12;
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*(--target)=u=bp1[(c--)];
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if ((u+0x1000)>0x1fff) retval=1;
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temp=bp2;
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bp2=bp1;
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bp1=temp;
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}
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return retval;
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}
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static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f, int *inp2, int l)
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{
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unsigned int *ptr1,*ptr2;
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int work[10];
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int a,b;
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int x;
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int result;
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if(l+1<NBLOCKS/2) a=NBLOCKS-(l+1);
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else a=l+1;
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b=NBLOCKS-a;
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if (l==0)
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{
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glob->decsp=glob->sptr=glob->gbuf2;
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glob->decptr=glob->gbuf1;
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}
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ptr1=inp;
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ptr2=inp2;
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for (x=0;x<10*n;x++)
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*(glob->sptr++)=(a*(*ptr1++)+b*(*ptr2++))>>2;
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result=eq(glob,glob->decsp,work);
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if (result==1)
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{
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dec1(glob,data,inp,n,f);
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} else {
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*(glob->decptr++)=rms(work,f);
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glob->decptr++;
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}
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glob->decsp+=n*10;
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}
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/* Uncompress one block (20 bytes -> 160*2 bytes) */
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static int ra144_decode_frame(AVCodecContext * avctx,
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void *vdata, int *data_size,
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uint8_t * buf, int buf_size)
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{
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unsigned int a,b,c;
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long s;
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signed short *shptr;
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unsigned int *lptr,*temp;
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const short **dptr;
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int16_t *datao;
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int16_t *data = vdata;
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Real144_internal *glob=avctx->priv_data;
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if(buf_size==0)
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return 0;
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datao = data;
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unpack_input(buf,glob->unpacked);
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glob->iptr=glob->unpacked;
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glob->val=decodetable[0][(*(glob->iptr++))<<1];
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dptr=decodetable+1;
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lptr=glob->swapbuf1;
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while (lptr<glob->swapbuf1+10)
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*(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1];
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do_voice(glob->swapbuf1,glob->swapbuf2);
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a=t_sqrt(glob->val*glob->oldval)>>12;
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for (c=0;c<NBLOCKS;c++) {
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if (c==(NBLOCKS-1)) {
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dec1(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val);
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} else {
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if (c*2==(NBLOCKS-2)) {
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if (glob->oldval<glob->val) {
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dec2(glob,glob->swapbuf1,glob->swapbuf2,3,a,glob->swapbuf2alt,c);
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} else {
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dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,a,glob->swapbuf2,c);
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}
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} else {
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if (c*2<(NBLOCKS-2)) {
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dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,glob->oldval,glob->swapbuf2,c);
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} else {
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dec2(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val,glob->swapbuf2alt,c);
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}
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}
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}
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}
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/* do output */
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for (b=0,c=0;c<4;c++) {
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glob->gval=glob->gbuf1[c*2];
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glob->gsp=glob->gbuf2+b;
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do_output_subblock(glob,glob->resetflag);
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glob->resetflag=0;
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shptr=glob->output_buffer;
|
|
while (shptr<glob->output_buffer+BLOCKSIZE) {
|
|
s=*(shptr++)<<2;
|
|
*data=s;
|
|
if (s>32767) *data=32767;
|
|
if (s<-32767) *data=-32768;
|
|
data++;
|
|
}
|
|
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;
|
|
*data_size=(data-datao)*sizeof(*data);
|
|
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,
|
|
};
|