RealAudio 1.0 (14_4) and 2.0 (28_8) native decoders.

Author unknown, code from a public domain player for Amiga
at http://www.honeypot.net/audio


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10261 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 437 insertions, 0 deletions

diff --git a/libmpcodecs/native/decode144.c b/libmpcodecs/native/decode144.c
new file mode 100644
index 0000000000..e25a6c0820
--- /dev/null
+++ b/libmpcodecs/native/decode144.c
@@ -0,0 +1,437 @@
+#include "common1428.h"
+#include "decode144.h"
+#include "tables144.h"
+
+/* Initialize internal variable structure */
+Real_144 *init_144(void)
+{
+	Real_internal *glob;
+
+	if ((glob=malloc(sizeof(Real_internal))))
+	  memset(glob,0,sizeof(Real_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 (Real_144 *)glob;
+}
+
+/* Free internal variable structure */
+void free_144(Real_144 *global)
+{
+	if (!global) return;
+	free(global);
+}
+
+/* Uncompress one block (20 bytes -> 160*2 bytes) */
+void decode_144(Real_144 *global, unsigned char *source, signed short *target)
+{
+  unsigned int a,b,c;
+  long s;
+  signed short *shptr;
+  unsigned int *lptr,*temp;
+  const short **dptr;
+  Real_internal *glob;
+
+  if (!global) return;
+  glob = (Real_internal *)global;
+
+  unpack_input(source,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;
+      *target=s;
+      if (s>32767) *target=32767;
+      if (s<-32767) *target=-32768;
+      target++;
+    }
+    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;
+}
+
+/* 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(Real_internal *glob, 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(Real_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest)
+{
+  int a,b,c;
+  int x;
+  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(Real_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;
+  int d;
+  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(Real_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 void dec2(Real_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;
+}
+
+
+static int eq(Real_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;
+}