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FFmpeg/libavcodec/ra144.c

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/*
* Real Audio 1.0 (14.4K)
* Copyright (c) 2003 the ffmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "ra144.h"
#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, unsigned 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,
void *vdata, int *data_size,
uint8_t * buf, int buf_size)
{
unsigned int a,b,c;
long s;
signed short *shptr;
unsigned int *lptr,*temp;
const short **dptr;
int16_t *datao;
int16_t *data = vdata;
Real144_internal *glob=avctx->priv_data;
if(buf_size==0)
return 0;
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;
*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,
};