mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
278 lines
6.7 KiB
278 lines
6.7 KiB
/* |
|
* RealAudio 2.0 (28.8K) |
|
* 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" |
|
#include "ra288.h" |
|
|
|
typedef struct { |
|
float history[8]; |
|
float output[40]; |
|
float pr1[36]; |
|
float pr2[10]; |
|
int phase, phasep; |
|
|
|
float st1a[111],st1b[37],st1[37]; |
|
float st2a[38],st2b[11],st2[11]; |
|
float sb[41]; |
|
float lhist[10]; |
|
} Real288_internal; |
|
|
|
static int ra288_decode_init(AVCodecContext * avctx) |
|
{ |
|
Real288_internal *glob=avctx->priv_data; |
|
memset(glob,0,sizeof(Real288_internal)); |
|
return 0; |
|
} |
|
|
|
static void prodsum(float *tgt, float *src, int len, int n); |
|
static void co(int n, int i, int j, float *in, float *out, float *st1, float *st2, const float *table); |
|
static int pred(float *in, float *tgt, int n); |
|
static void colmult(float *tgt, float *m1, const float *m2, int n); |
|
|
|
|
|
/* initial decode */ |
|
static void unpack(unsigned short *tgt, unsigned char *src, int len) |
|
{ |
|
int x,y,z; |
|
int n,temp; |
|
int buffer[len]; |
|
|
|
for (x=0;x<len;tgt[x++]=0) |
|
buffer[x]=9+(x&1); |
|
|
|
for (x=y=z=0;x<len/*was 38*/;x++) { |
|
n=buffer[y]-z; |
|
temp=src[x]; |
|
if (n<8) temp&=255>>(8-n); |
|
tgt[y]+=temp<<z; |
|
if (n<=8) { |
|
tgt[++y]+=src[x]>>n; |
|
z=8-n; |
|
} else z+=8; |
|
} |
|
} |
|
|
|
static void update(Real288_internal *glob) |
|
{ |
|
int x,y; |
|
float buffer1[40],temp1[37]; |
|
float buffer2[8],temp2[11]; |
|
|
|
for (x=0,y=glob->phasep+5;x<40;buffer1[x++]=glob->output[(y++)%40]); |
|
co(36,40,35,buffer1,temp1,glob->st1a,glob->st1b,table1); |
|
if (pred(temp1,glob->st1,36)) |
|
colmult(glob->pr1,glob->st1,table1a,36); |
|
|
|
for (x=0,y=glob->phase+1;x<8;buffer2[x++]=glob->history[(y++)%8]); |
|
co(10,8,20,buffer2,temp2,glob->st2a,glob->st2b,table2); |
|
if (pred(temp2,glob->st2,10)) |
|
colmult(glob->pr2,glob->st2,table2a,10); |
|
} |
|
|
|
/* Decode and produce output */ |
|
static void decode(Real288_internal *glob, unsigned int input) |
|
{ |
|
unsigned int x,y; |
|
float f; |
|
double sum,sumsum; |
|
float *p1,*p2; |
|
float buffer[5]; |
|
const float *table; |
|
|
|
for (x=36;x--;glob->sb[x+5]=glob->sb[x]); |
|
for (x=5;x--;) { |
|
p1=glob->sb+x;p2=glob->pr1; |
|
for (sum=0,y=36;y--;sum-=(*(++p1))*(*(p2++))); |
|
glob->sb[x]=sum; |
|
} |
|
|
|
f=amptable[input&7]; |
|
table=codetable+(input>>3)*5; |
|
|
|
/* convert log and do rms */ |
|
for (sum=32,x=10;x--;sum-=glob->pr2[x]*glob->lhist[x]); |
|
if (sum<0) sum=0; else if (sum>60) sum=60; |
|
|
|
sumsum=exp(sum*0.1151292546497)*f; /* pow(10.0,sum/20)*f */ |
|
for (sum=0,x=5;x--;) { buffer[x]=table[x]*sumsum; sum+=buffer[x]*buffer[x]; } |
|
if ((sum/=5)<1) sum=1; |
|
|
|
/* shift and store */ |
|
for (x=10;--x;glob->lhist[x]=glob->lhist[x-1]); |
|
*glob->lhist=glob->history[glob->phase]=10*log10(sum)-32; |
|
|
|
for (x=1;x<5;x++) for (y=x;y--;buffer[x]-=glob->pr1[x-y-1]*buffer[y]); |
|
|
|
/* output */ |
|
for (x=0;x<5;x++) { |
|
f=glob->sb[4-x]+buffer[x]; |
|
if (f>4095) f=4095; else if (f<-4095) f=-4095; |
|
glob->output[glob->phasep+x]=glob->sb[4-x]=f; |
|
} |
|
} |
|
|
|
/* column multiply */ |
|
static void colmult(float *tgt, float *m1, const float *m2, int n) |
|
{ |
|
while (n--) |
|
*(tgt++)=(*(m1++))*(*(m2++)); |
|
} |
|
|
|
static int pred(float *in, float *tgt, int n) |
|
{ |
|
int x,y; |
|
float *p1,*p2; |
|
double f0,f1,f2; |
|
float temp; |
|
|
|
if (in[n]==0) return 0; |
|
if ((f0=*in)<=0) return 0; |
|
|
|
for (x=1;;x++) { |
|
if (n<x) return 1; |
|
|
|
p1=in+x; |
|
p2=tgt; |
|
f1=*(p1--); |
|
for (y=x;--y;f1+=(*(p1--))*(*(p2++))); |
|
|
|
p1=tgt+x-1; |
|
p2=tgt; |
|
*(p1--)=f2=-f1/f0; |
|
for (y=x>>1;y--;) { |
|
temp=*p2+*p1*f2; |
|
*(p1--)+=*p2*f2; |
|
*(p2++)=temp; |
|
} |
|
if ((f0+=f1*f2)<0) return 0; |
|
} |
|
} |
|
|
|
static void co(int n, int i, int j, float *in, float *out, float *st1, float *st2, const float *table) |
|
{ |
|
int a,b,c; |
|
unsigned int x; |
|
float *fp; |
|
float buffer1[37]; |
|
float buffer2[37]; |
|
float work[111]; |
|
|
|
/* rotate and multiply */ |
|
c=(b=(a=n+i)+j)-i; |
|
fp=st1+i; |
|
for (x=0;x<b;x++) { |
|
if (x==c) fp=in; |
|
work[x]=*(table++)*(*(st1++)=*(fp++)); |
|
} |
|
|
|
prodsum(buffer1,work+n,i,n); |
|
prodsum(buffer2,work+a,j,n); |
|
|
|
for (x=0;x<=n;x++) { |
|
*st2=*st2*(0.5625)+buffer1[x]; |
|
out[x]=*(st2++)+buffer2[x]; |
|
} |
|
*out*=1.00390625; /* to prevent clipping */ |
|
} |
|
|
|
/* product sum (lsf) */ |
|
static void prodsum(float *tgt, float *src, int len, int n) |
|
{ |
|
unsigned int x; |
|
float *p1,*p2; |
|
double sum; |
|
|
|
while (n>=0) |
|
{ |
|
p1=(p2=src)-n; |
|
for (sum=0,x=len;x--;sum+=(*p1++)*(*p2++)); |
|
tgt[n--]=sum; |
|
} |
|
} |
|
|
|
void * decode_block(AVCodecContext * avctx, unsigned char *in, signed short int *out,unsigned len) |
|
{ |
|
int x,y; |
|
Real288_internal *glob=avctx->priv_data; |
|
unsigned short int buffer[len]; |
|
|
|
unpack(buffer,in,len); |
|
for (x=0;x<32;x++) |
|
{ |
|
glob->phasep=(glob->phase=x&7)*5; |
|
decode(glob,buffer[x]); |
|
for (y=0;y<5;*(out++)=8*glob->output[glob->phasep+(y++)]); |
|
if (glob->phase==3) update(glob); |
|
} |
|
return out; |
|
} |
|
|
|
/* Decode a block (celp) */ |
|
static int ra288_decode_frame(AVCodecContext * avctx, |
|
void *data, int *data_size, |
|
uint8_t * buf, int buf_size) |
|
{ |
|
if(avctx->extradata_size>=6) |
|
{ |
|
//((short*)(avctx->extradata))[0]; /* subpacket size */ |
|
//((short*)(avctx->extradata))[1]; /* subpacket height */ |
|
//((short*)(avctx->extradata))[2]; /* subpacket flavour */ |
|
//((short*)(avctx->extradata))[3]; /* coded frame size */ |
|
//((short*)(avctx->extradata))[4]; /* codec's data length */ |
|
//((short*)(avctx->extradata))[5...] /* codec's data */ |
|
int bret; |
|
void *datao; |
|
int w=avctx->block_align; /* 228 */ |
|
int h=((short*)(avctx->extradata))[1]; /* 12 */ |
|
int cfs=((short*)(avctx->extradata))[3]; /* coded frame size 38 */ |
|
int i,j; |
|
if(buf_size<w*h) |
|
{ |
|
fprintf(stderr,"ffra288: Error! Input buffer is too small [%d<%d]\n",buf_size,w*h); |
|
return 0; |
|
} |
|
datao = data; |
|
bret = 0; |
|
for (j = 0; j < h/2; j++) |
|
for (i = 0; i < h; i++) |
|
{ |
|
data=decode_block(avctx,&buf[j*cfs+cfs*i*h/2],(signed short *)data,cfs); |
|
bret += cfs; |
|
} |
|
*data_size = data - datao; |
|
return bret; |
|
} |
|
else |
|
{ |
|
fprintf(stderr,"ffra288: Error: need extra data!!!\n"); |
|
return 0; |
|
} |
|
} |
|
|
|
AVCodec ra_288_decoder = |
|
{ |
|
"real_288", |
|
CODEC_TYPE_AUDIO, |
|
CODEC_ID_RA_288, |
|
sizeof(Real288_internal), |
|
ra288_decode_init, |
|
NULL, |
|
NULL, |
|
ra288_decode_frame, |
|
};
|
|
|