--- /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