+++ /dev/null
-/*
- * 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,
-};
projects / synfig.git / blobdiff