Initial revision

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 1703 insertions, 0 deletions

diff --git a/mp3lib/layer3.c b/mp3lib/layer3.c
new file mode 100644
index 0000000000..2c8c29f24c
--- /dev/null
+++ b/mp3lib/layer3.c
@@ -0,0 +1,1703 @@
+
+/*
+ * Mpeg Layer-3 audio decoder 
+ * --------------------------
+ * copyright (c) 1995,1996,1997 by Michael Hipp.
+ * All rights reserved. See also 'README'
+ *
+ * - I'm currently working on that .. needs a few more optimizations,
+ *   though the code is now fast enough to run in realtime on a 100Mhz 486
+ * - a few personal notes are in german .. 
+ *
+ * used source: 
+ *   mpeg1_iis package
+ */ 
+
+static real ispow[8207];
+static real aa_ca[8],aa_cs[8];
+static real COS1[12][6];
+static real win[4][36];
+static real win1[4][36];
+
+#define GP2MAX (256+118+4)
+static real gainpow2[GP2MAX];
+
+static real nCOS9[9];
+static real COS6_1,COS6_2;
+static real tfcos36[9];
+static real tfcos12[3];
+#ifdef NEW_DCT9
+static real cos9[3],cos18[3];
+#endif
+
+struct bandInfoStruct {
+  int longIdx[23];
+  int longDiff[22];
+  int shortIdx[14];
+  int shortDiff[13];
+};
+
+int longLimit[9][23];
+int shortLimit[9][14];
+
+struct bandInfoStruct bandInfo[9] = {
+
+/* MPEG 1.0 */
+ { {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576},
+   {4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
+   {0,4*3,8*3,12*3,16*3,22*3,30*3,40*3,52*3,66*3, 84*3,106*3,136*3,192*3},
+   {4,4,4,4,6,8,10,12,14,18,22,30,56} } ,
+
+ { {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576},
+   {4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
+   {0,4*3,8*3,12*3,16*3,22*3,28*3,38*3,50*3,64*3, 80*3,100*3,126*3,192*3},
+   {4,4,4,4,6,6,10,12,14,16,20,26,66} } ,
+
+ { {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} ,
+	{4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} ,
+	{0,4*3,8*3,12*3,16*3,22*3,30*3,42*3,58*3,78*3,104*3,138*3,180*3,192*3} ,
+   {4,4,4,4,6,8,12,16,20,26,34,42,12} }  ,
+
+/* MPEG 2.0 */
+ { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
+	{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } ,
+   {0,4*3,8*3,12*3,18*3,24*3,32*3,42*3,56*3,74*3,100*3,132*3,174*3,192*3} ,
+   {4,4,4,6,6,8,10,14,18,26,32,42,18 } } ,
+
+ { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,330,394,464,540,576},
+   {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,52,64,70,76,36 } ,
+   {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,136*3,180*3,192*3} ,
+   {4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,
+
+ { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
+   {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 },
+   {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,134*3,174*3,192*3},
+   {4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
+
+/* MPEG 2.5 */
+ { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
+	{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
+   {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
+   {4,4,4,6,8,10,12,14,18,24,30,40,18} },
+
+ { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
+   {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
+	{0,12,24,36,54,78,108,144,186,240,312,402,522,576},
+   {4,4,4,6,8,10,12,14,18,24,30,40,18} },
+
+ { {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
+   {12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
+   {0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
+   {8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
+};
+
+static int mapbuf0[9][152];
+static int mapbuf1[9][156];
+static int mapbuf2[9][44];
+static int *map[9][3];
+static int *mapend[9][3];
+
+static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */
+static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */
+
+static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
+static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];
+
+/*
+ * init tables for layer-3
+ */
+void init_layer3(int down_sample_sblimit)
+{
+  int i,j,k,l;
+
+  for(i=-256;i<118+4;i++)
+    gainpow2[i+256] = pow((double)2.0,-0.25 * (double) (i+210) );
+
+  for(i=0;i<8207;i++)
+    ispow[i] = pow((double)i,(double)4.0/3.0);
+
+  for (i=0;i<8;i++)
+  {
+    static double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037};
+    double sq=sqrt(1.0+Ci[i]*Ci[i]);
+    aa_cs[i] = 1.0/sq;
+    aa_ca[i] = Ci[i]/sq;
+  }
+
+  for(i=0;i<18;i++)
+  {
+    win[0][i]    = win[1][i]    = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+0) +1) ) / cos ( M_PI * (double) (2*(i+0) +19) / 72.0 );
+    win[0][i+18] = win[3][i+18] = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
+  }
+  for(i=0;i<6;i++)
+  {
+    win[1][i+18] = 0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 );
+    win[3][i+12] = 0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 );
+    win[1][i+24] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+13) ) / cos ( M_PI * (double) (2*(i+24)+19) / 72.0 );
+    win[1][i+30] = win[3][i] = 0.0;
+    win[3][i+6 ] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) )  / cos ( M_PI * (double) (2*(i+6 )+19) / 72.0 );
+  }
+
+  for(i=0;i<9;i++)
+    nCOS9[i] = cos( M_PI / 18.0 * (double) i);
+
+  for(i=0;i<9;i++)
+    tfcos36[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 );
+  for(i=0;i<3;i++)
+    tfcos12[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 );
+
+  COS6_1 = cos( M_PI / 6.0 * (double) 1);
+  COS6_2 = cos( M_PI / 6.0 * (double) 2);
+
+#ifdef NEW_DCT9
+  cos9[0] = cos(1.0*M_PI/9.0);
+  cos9[1] = cos(5.0*M_PI/9.0);
+  cos9[2] = cos(7.0*M_PI/9.0);
+  cos18[0] = cos(1.0*M_PI/18.0);
+  cos18[1] = cos(11.0*M_PI/18.0);
+  cos18[2] = cos(13.0*M_PI/18.0);
+#endif
+
+  for(i=0;i<12;i++)
+  {
+    win[2][i]  = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 );
+    for(j=0;j<6;j++)
+      COS1[i][j] = cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) );
+  }
+
+  for(j=0;j<4;j++) {
+    static int len[4] = { 36,36,12,36 };
+    for(i=0;i<len[j];i+=2)
+      win1[j][i] = + win[j][i];
+    for(i=1;i<len[j];i+=2)
+      win1[j][i] = - win[j][i];
+  }
+
+  for(i=0;i<16;i++)
+  {
+    double t = tan( (double) i * M_PI / 12.0 );
+    tan1_1[i] = t / (1.0+t);
+    tan2_1[i] = 1.0 / (1.0 + t);
+    tan1_2[i] = M_SQRT2 * t / (1.0+t);
+    tan2_2[i] = M_SQRT2 / (1.0 + t);
+
+    for(j=0;j<2;j++) {
+      double base = pow(2.0,-0.25*(j+1.0));
+      double p1=1.0,p2=1.0;
+      if(i > 0) {
+        if( i & 1 )
+          p1 = pow(base,(i+1.0)*0.5);
+        else
+          p2 = pow(base,i*0.5);
+      }
+      pow1_1[j][i] = p1;
+      pow2_1[j][i] = p2;
+      pow1_2[j][i] = M_SQRT2 * p1;
+      pow2_2[j][i] = M_SQRT2 * p2;
+    }
+  }
+
+  for(j=0;j<9;j++)
+  {
+   struct bandInfoStruct *bi = &bandInfo[j];
+   int *mp;
+   int cb,lwin;
+   int *bdf;
+
+   mp = map[j][0] = mapbuf0[j];
+   bdf = bi->longDiff;
+   for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) {
+     *mp++ = (*bdf) >> 1;
+     *mp++ = i;
+     *mp++ = 3;
+     *mp++ = cb;
+   }
+   bdf = bi->shortDiff+3;
+   for(cb=3;cb<13;cb++) {
+     int l = (*bdf++) >> 1;
+     for(lwin=0;lwin<3;lwin++) {
+       *mp++ = l;
+       *mp++ = i + lwin;
+       *mp++ = lwin;
+       *mp++ = cb;
+     }
+     i += 6*l;
+   }
+   mapend[j][0] = mp;
+
+   mp = map[j][1] = mapbuf1[j];
+   bdf = bi->shortDiff+0;
+   for(i=0,cb=0;cb<13;cb++) {
+     int l = (*bdf++) >> 1;
+     for(lwin=0;lwin<3;lwin++) {
+       *mp++ = l;
+       *mp++ = i + lwin;
+       *mp++ = lwin;
+       *mp++ = cb;
+     }
+     i += 6*l;
+   }
+   mapend[j][1] = mp;
+
+   mp = map[j][2] = mapbuf2[j];
+   bdf = bi->longDiff;
+   for(cb = 0; cb < 22 ; cb++) {
+     *mp++ = (*bdf++) >> 1;
+     *mp++ = cb;
+   }
+   mapend[j][2] = mp;
+
+  }
+
+  for(j=0;j<9;j++) {
+    for(i=0;i<23;i++) {
+      longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
+      if(longLimit[j][i] > (down_sample_sblimit) )
+        longLimit[j][i] = down_sample_sblimit;
+    }
+    for(i=0;i<14;i++) {
+      shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
+      if(shortLimit[j][i] > (down_sample_sblimit) )
+        shortLimit[j][i] = down_sample_sblimit;
+    }
+  }
+
+  for(i=0;i<5;i++) {
+    for(j=0;j<6;j++) {
+      for(k=0;k<6;k++) {
+        int n = k + j * 6 + i * 36;
+        i_slen2[n] = i|(j<<3)|(k<<6)|((long)3<<12);
+      }
+    }
+  }
+  for(i=0;i<4;i++) {
+    for(j=0;j<4;j++) {
+      for(k=0;k<4;k++) {
+        int n = k + j * 4 + i * 16;
+        i_slen2[n+180] = i|(j<<3)|(k<<6)|((long)4<<12);
+      }
+    }
+  }
+  for(i=0;i<4;i++) {
+    for(j=0;j<3;j++) {
+      int n = j + i * 3;
+      i_slen2[n+244] = i|(j<<3) | ((long)5<<12);
+      n_slen2[n+500] = i|(j<<3) | ((long)2<<12) | ((long)1<<15);
+    }
+  }
+
+  for(i=0;i<5;i++) {
+    for(j=0;j<5;j++) {
+      for(k=0;k<4;k++) {
+        for(l=0;l<4;l++) {
+          int n = l + k * 4 + j * 16 + i * 80;
+          n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|((long)0<<12);
+        }
+      }
+    }
+  }
+  for(i=0;i<5;i++) {
+    for(j=0;j<5;j++) {
+      for(k=0;k<4;k++) {
+        int n = k + j * 4 + i * 20;
+        n_slen2[n+400] = i|(j<<3)|(k<<6)|((long)1<<12);
+      }
+    }
+  }
+} /* init_layer3() */
+
+/* ========================== READ FRAME DATA ========================= */
+
+#if 1
+LOCAL real Gainpow2(int i){
+//  if(i<0) i=0; else
+//  if(i>=GP2MAX) i=GP2MAX-1;
+//  return gainpow2[i];
+  return gainpow2[((i)<0)?0:( ((i)<GP2MAX)?(i):(GP2MAX-1) )];
+}
+#else
+#define Gainpow2(i) gainpow2[((i)<0)?0:( ((i)<GP2MAX)?(i):(GP2MAX-1) )]
+#endif
+
+/*
+ * read additional side information
+ */
+static void III_get_side_info_1(struct III_sideinfo *si,int stereo,
+ int ms_stereo,long sfreq,int single)
+{
+   int ch, gr;
+   int powdiff = (single == 3) ? 4 : 0;
+
+   si->main_data_begin = getbits(9);
+
+   if (stereo == 1)
+     si->private_bits = getbits_fast(5);
+   else 
+     si->private_bits = getbits_fast(3);
+
+   for (ch=0; ch<stereo; ch++) {
+       si->ch[ch].gr[0].scfsi = -1;
+       si->ch[ch].gr[1].scfsi = getbits_fast(4);
+   }
+
+   for (gr=0; gr<2; gr++) {
+     for (ch=0; ch<stereo; ch++) {
+       register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]);
+
+       gr_info->part2_3_length = getbits(12);
+       gr_info->big_values = getbits(9);
+       if(gr_info->big_values > 288) {
+          printf("\rbig_values too large!                                                        \n");
+          gr_info->big_values = 288;
+       }
+       gr_info->pow2gain = 256 - getbits_fast(8) + powdiff;
+       if(ms_stereo) gr_info->pow2gain += 2;
+       gr_info->scalefac_compress = getbits_fast(4);
+
+       if(get1bit()) {
+         /* window-switching flag==1  (block_Type!=0)  */
+         int i;
+         gr_info->block_type = getbits_fast(2);
+         gr_info->mixed_block_flag = get1bit();
+         gr_info->table_select[0] = getbits_fast(5);
+         gr_info->table_select[1] = getbits_fast(5);
+         /*
+          * table_select[2] not needed, because there is no region2,
+          * but to satisfy some verifications tools we set it either.
+          */
+         gr_info->table_select[2] = 0;
+         for(i=0;i<3;i++)
+           gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3);
+
+         if(gr_info->block_type == 0) {
+           printf("\rBlocktype == 0 and window-switching == 1 not allowed.                        \n");
+           return;
+         }
+         /* region_count/start parameters are implicit in this case. */
+         gr_info->region1start = 36>>1;
+         gr_info->region2start = 576>>1;
+       } else {
+         /* window-switching flag==0  (block_Type==0)  */
+         int i,r0c,r1c;
+         for (i=0; i<3; i++)
+           gr_info->table_select[i] = getbits_fast(5);
+         r0c = getbits_fast(4);
+         r1c = getbits_fast(3);
+         gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
+         gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
+         gr_info->block_type = 0;
+         gr_info->mixed_block_flag = 0;
+       }
+       gr_info->preflag = get1bit();
+       gr_info->scalefac_scale = get1bit();
+       gr_info->count1table_select = get1bit();
+     }
+   }
+}
+
+/*
+ * Side Info for MPEG 2.0 / LSF
+ */
+static void III_get_side_info_2(struct III_sideinfo *si,int stereo,
+ int ms_stereo,long sfreq,int single)
+{
+   int ch;
+   int powdiff = (single == 3) ? 4 : 0;
+
+   si->main_data_begin = getbits(8);
+   if (stereo == 1)
+     si->private_bits = get1bit();
+   else 
+     si->private_bits = getbits_fast(2);
+
+   for (ch=0; ch<stereo; ch++) {
+       register struct gr_info_s *gr_info = &(si->ch[ch].gr[0]);
+
+       gr_info->part2_3_length = getbits(12);
+       gr_info->big_values = getbits(9);
+       if(gr_info->big_values > 288) {
+         printf("\rbig_values too large!                                                        \n");
+         gr_info->big_values = 288;
+       }
+       gr_info->pow2gain = 256 - getbits_fast(8) + powdiff;
+       if(ms_stereo)
+         gr_info->pow2gain += 2;
+       gr_info->scalefac_compress = getbits(9);
+
+       if(get1bit()) {
+         /* window-switching flag==1  (block_Type!=0)  */
+         int i;
+         gr_info->block_type = getbits_fast(2);
+         gr_info->mixed_block_flag = get1bit();
+         gr_info->table_select[0] = getbits_fast(5);
+         gr_info->table_select[1] = getbits_fast(5);
+         /*
+          * table_select[2] not needed, because there is no region2,
+          * but to satisfy some verifications tools we set it either.
+          */
+         gr_info->table_select[2] = 0;
+         for(i=0;i<3;i++)
+           gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3);
+
+         if(gr_info->block_type == 0) {
+           printf("\rBlocktype == 0 and window-switching == 1 not allowed.                        \n");
+           return;
+         }
+         /* region_count/start parameters are implicit in this case. */       
+/* check this again! */
+         if(gr_info->block_type == 2)
+           gr_info->region1start = 36>>1;
+         else if(sfreq == 8)
+/* check this for 2.5 and sfreq=8 */
+           gr_info->region1start = 108>>1;
+         else
+           gr_info->region1start = 54>>1;
+         gr_info->region2start = 576>>1;
+       } else {
+         /* window-switching flag==0  (block_Type==0)  */
+         int i,r0c,r1c;
+         for (i=0; i<3; i++)
+           gr_info->table_select[i] = getbits_fast(5);
+         r0c = getbits_fast(4);
+         r1c = getbits_fast(3);
+         gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
+         gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
+         gr_info->block_type = 0;
+         gr_info->mixed_block_flag = 0;
+       }
+       gr_info->scalefac_scale = get1bit();
+       gr_info->count1table_select = get1bit();
+   }
+}
+
+/*
+ * read scalefactors
+ */
+static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_info)
+{
+   static unsigned char slen[2][16] = {
+     {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
+     {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
+   };
+   int numbits;
+   int num0 = slen[0][gr_info->scalefac_compress];
+   int num1 = slen[1][gr_info->scalefac_compress];
+
+    if (gr_info->block_type == 2) {
+      int i=18;
+      numbits = (num0 + num1) * 18;
+      if (gr_info->mixed_block_flag) {
+         for (i=8;i;i--) *scf++ = getbits(num0);
+         i = 9;
+         numbits -= num0; /* num0 * 17 + num1 * 18 */
+      }
+      for (;i;i--) *scf++ = getbits(num0);
+      for (i = 18; i; i--) *scf++ = getbits(num1);
+      *scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */
+    } else {
+      int i;
+      int scfsi = gr_info->scfsi;
+
+      if(scfsi < 0) { /* scfsi < 0 => granule == 0 */
+         for(i=11;i;i--) *scf++ = getbits(num0);
+         for(i=10;i;i--) *scf++ = getbits(num1);
+         numbits = (num0 + num1) * 10 + num0;
+      } else {
+        numbits = 0;
+        if(!(scfsi & 0x8)) {
+          for (i=6;i;i--) *scf++ = getbits(num0);
+          numbits += num0 * 6;
+        } else {
+          scf += 6;
+        }
+        if(!(scfsi & 0x4)) {
+          for (i=5;i;i--) *scf++ = getbits(num0);
+          numbits += num0 * 5;
+        } else {
+          scf += 5;
+        }
+        if(!(scfsi & 0x2)) {
+          for(i=5;i;i--) *scf++ = getbits(num1);
+          numbits += num1 * 5;
+        } else {
+          scf += 5;
+        }
+        if(!(scfsi & 0x1)) {
+          for (i=5;i;i--) *scf++ = getbits(num1);
+          numbits += num1 * 5;
+        } else {
+          scf += 5;
+        }
+      }
+
+      *scf++ = 0;  /* no l[21] in original sources */
+    }
+    return numbits;
+}
+
+static int III_get_scale_factors_2(int *scf,struct gr_info_s *gr_info,int i_stereo)
+{
+  unsigned char *pnt;
+  int i,j;
+  unsigned int slen;
+  int n = 0;
+  int numbits = 0;
+
+  static unsigned char stab[3][6][4] = {
+   { { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} ,
+     { 7, 7, 7,0 } , { 6, 6, 6,3 } , {  8, 8,5,0} } ,
+   { { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} ,
+     {12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } ,
+   { { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} ,
+     { 6,15,12,0 } , { 6,12, 9,6 } , {  6,18,9,0} } }; 
+
+  if(i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */
+    slen = i_slen2[gr_info->scalefac_compress>>1];
+  else
+    slen = n_slen2[gr_info->scalefac_compress];
+
+  gr_info->preflag = (slen>>15) & 0x1;
+
+  n = 0;  
+  if( gr_info->block_type == 2 ) {
+    n++;
+    if(gr_info->mixed_block_flag) n++;
+  }
+
+  pnt = stab[n][(slen>>12)&0x7];
+
+  for(i=0;i<4;i++) {
+    int num = slen & 0x7;
+    slen >>= 3;
+    if(num) {
+      for(j=0;j<(int)(pnt[i]);j++) *scf++ = getbits_fast(num);
+      numbits += pnt[i] * num;
+    }
+    else {
+      for(j=0;j<(int)(pnt[i]);j++) *scf++ = 0;
+    }
+  }
+  
+  n = (n << 1) + 1;
+  for(i=0;i<n;i++) *scf++ = 0;
+
+  return numbits;
+}
+
+static int pretab1[22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0};
+static int pretab2[22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+
+/*
+ * don't forget to apply the same changes to III_dequantize_sample_ms() !!!
+ */
+static int III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int *scf,
+   struct gr_info_s *gr_info,int sfreq,int part2bits)
+{
+  int shift = 1 + gr_info->scalefac_scale;
+  real *xrpnt = (real *) xr;
+  int l[3],l3;
+  int part2remain = gr_info->part2_3_length - part2bits;
+  int *me;
+
+  { int bv       = gr_info->big_values;
+    int region1  = gr_info->region1start;
+    int region2  = gr_info->region2start;
+
+    l3 = ((576>>1)-bv)>>1;
+/*
+ * we may lose the 'odd' bit here !!
+ * check this later again 
+ */
+    if(bv <= region1) {
+      l[0] = bv; l[1] = 0; l[2] = 0;
+    } else {
+      l[0] = region1;
+      if(bv <= region2) {
+        l[1] = bv - l[0];  l[2] = 0;
+      } else {
+        l[1] = region2 - l[0]; l[2] = bv - region2;
+      }
+    }
+  }
+
+  if(gr_info->block_type == 2) {
+    /*
+     * decoding with short or mixed mode BandIndex table 
+     */
+    int i,max[4];
+    int step=0,lwin=0,cb=0;
+    register real v = 0.0;
+    register int *m,mc;
+
+    if(gr_info->mixed_block_flag) {
+      max[3] = -1;
+      max[0] = max[1] = max[2] = 2;
+      m = map[sfreq][0];
+      me = mapend[sfreq][0];
+    } else {
+      max[0] = max[1] = max[2] = max[3] = -1;
+      /* max[3] not really needed in this case */
+      m = map[sfreq][1];
+      me = mapend[sfreq][1];
+    }
+
+    mc = 0;
+    for(i=0;i<2;i++) {
+      int lp = l[i];
+      struct newhuff *h = ht+gr_info->table_select[i];
+      for(;lp;lp--,mc--) {
+        register int x,y;
+        if( (!mc) ) {
+          mc = *m++;
+          xrpnt = ((real *) xr) + (*m++);
+          lwin = *m++;
+          cb = *m++;
+          if(lwin == 3) {
+            v = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
+            step = 1;
+          } else {
+            v = Gainpow2(gr_info->full_gain[lwin] + ((*scf++) << shift));
+            step = 3;
+          }
+        }
+        { register short *val = h->table;
+          while((y=*val++)<0) {
+            part2remain--;
+            if(part2remain < 0) return 0;
+            if (get1bit()) val-=y;
+          }
+          x = y >> 4;
+          y &= 0xf;
+        }
+        if(x == 15) {
+          max[lwin] = cb;
+          part2remain -= h->linbits+1;
+          x += getbits(h->linbits);
+          if(get1bit())
+            *xrpnt = -ispow[x] * v;
+          else
+            *xrpnt =  ispow[x] * v;
+        } else if(x) {
+          max[lwin] = cb;
+          if(get1bit())
+            *xrpnt = -ispow[x] * v;
+          else
+            *xrpnt =  ispow[x] * v;
+          part2remain--;
+        } else
+          *xrpnt = 0.0;
+        xrpnt += step;
+        if(y == 15) {
+          max[lwin] = cb;
+          part2remain -= h->linbits+1;
+          y += getbits(h->linbits);
+          if(get1bit())
+            *xrpnt = -ispow[y] * v;
+          else
+            *xrpnt =  ispow[y] * v;
+        } else if(y) {
+          max[lwin] = cb;
+          if(get1bit())
+            *xrpnt = -ispow[y] * v;
+          else
+            *xrpnt =  ispow[y] * v;
+          part2remain--;
+        } else
+          *xrpnt = 0.0;
+        xrpnt += step;
+      }
+    }
+    
+    for(;l3 && (part2remain > 0);l3--) {
+      struct newhuff *h = htc+gr_info->count1table_select;
+      register short *val = h->table,a;
+
+      while((a=*val++)<0) {
+        part2remain--;
+        if(part2remain < 0) {
+          part2remain++;
+          a = 0;
+          break;
+        }
+        if (get1bit()) val-=a;
+      }
+
+      for(i=0;i<4;i++) {
+        if(!(i & 1)) {
+          if(!mc) {
+            mc = *m++;
+            xrpnt = ((real *) xr) + (*m++);
+            lwin = *m++;
+            cb = *m++;
+            if(lwin == 3) {
+              v = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
+              step = 1;
+            } else {
+              v = Gainpow2(gr_info->full_gain[lwin] + ((*scf++) << shift));
+              step = 3;
+            }
+          }
+          mc--;
+        }
+        if( (a & (0x8>>i)) ) {
+          max[lwin] = cb;
+          part2remain--;
+          if(part2remain < 0) {
+            part2remain++;
+            break;
+          }
+          if(get1bit())
+            *xrpnt = -v;
+          else
+            *xrpnt = v;
+        } else
+          *xrpnt = 0.0;
+        xrpnt += step;
+      }
+    } // for(;l3 && (part2remain > 0);l3--)
+ 
+    while( m < me ) {
+      if(!mc) {
+        mc = *m++;
+        xrpnt = ((real *) xr) + *m++;
+        if( (*m++) == 3)
+          step = 1;
+        else
+          step = 3;
+        m++; /* cb */
+      }
+      mc--;
+      *xrpnt = 0.0; xrpnt += step;
+      *xrpnt = 0.0; xrpnt += step;
+/* we could add a little opt. here:
+ * if we finished a band for window 3 or a long band
+ * further bands could copied in a simple loop without a
+ * special 'map' decoding
+ */
+    }
+
+    gr_info->maxband[0] = max[0]+1;
+    gr_info->maxband[1] = max[1]+1;
+    gr_info->maxband[2] = max[2]+1;
+    gr_info->maxbandl = max[3]+1;
+
+    { int rmax = max[0] > max[1] ? max[0] : max[1];
+      rmax = (rmax > max[2] ? rmax : max[2]) + 1;
+      gr_info->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1];
+    }
+
+  } else {
+    /*
+     * decoding with 'long' BandIndex table (block_type != 2)
+     */
+    int *pretab = gr_info->preflag ? pretab1 : pretab2;
+    int i,max = -1;
+    int cb = 0;
+    register int *m = map[sfreq][2];
+    register real v = 0.0;
+    register int mc = 0;
+#if 0
+    me = mapend[sfreq][2];
+#endif
+
+     /*
+     * long hash table values
+     */
+    for(i=0;i<3;i++) {
+      int lp = l[i];
+      struct newhuff *h = ht+gr_info->table_select[i];
+
+      for(;lp;lp--,mc--) {
+        int x,y;
+
+        if(!mc) {
+          mc = *m++;
+          v = Gainpow2(gr_info->pow2gain + (((*scf++) + (*pretab++)) << shift));
+          cb = *m++;
+        }
+        { register short *val = h->table;
+          while((y=*val++)<0) {
+            part2remain--;
+            if(part2remain < 0) return 0;
+            if (get1bit()) val -= y;
+//            if(part2remain<=0) return 0; // Arpi
+          }
+          x = y >> 4;
+          y &= 0xf;
+        }
+        if (x == 15) {
+          max = cb;
+          part2remain -= h->linbits+1;
+          x += getbits(h->linbits);
+          if(get1bit())
+            *xrpnt++ = -ispow[x] * v;
+          else
+            *xrpnt++ =  ispow[x] * v;
+        } else if(x) {
+          max = cb;
+          if(get1bit())
+            *xrpnt++ = -ispow[x] * v;
+          else
+            *xrpnt++ =  ispow[x] * v;
+          part2remain--;
+        } else
+          *xrpnt++ = 0.0;
+
+        if (y == 15) {
+          max = cb;
+          part2remain -= h->linbits+1;
+          y += getbits(h->linbits);
+          if(get1bit())
+            *xrpnt++ = -ispow[y] * v;
+          else
+            *xrpnt++ =  ispow[y] * v;
+        } else if(y) {
+          max = cb;
+          if(get1bit())
+            *xrpnt++ = -ispow[y] * v;
+          else
+            *xrpnt++ =  ispow[y] * v;
+          part2remain--;
+        } else
+          *xrpnt++ = 0.0;
+      }
+    }
+
+     /*
+     * short (count1table) values
+     */
+    for(;l3 && (part2remain > 0);l3--) {
+      struct newhuff *h = htc+gr_info->count1table_select;
+      register short *val = h->table,a;
+
+      while((a=*val++)<0) {
+        part2remain--;
+        if(part2remain < 0) {
+          part2remain++;
+          a = 0;
+          break;
+        }
+        if (get1bit()) val -= a;
+      }
+
+      for(i=0;i<4;i++) {
+        if(!(i & 1)) {
+          if(!mc) {
+            mc = *m++;
+            cb = *m++;
+            v = Gainpow2(gr_info->pow2gain + (((*scf++) + (*pretab++)) << shift));
+          }
+          mc--;
+        }
+        if ( (a & (0x8>>i)) ) {
+          max = cb;
+          part2remain--;
+          if(part2remain < 0) {
+            part2remain++;
+            break;
+          }
+          if(get1bit())
+            *xrpnt++ = -v;
+          else
+            *xrpnt++ = v;
+        } else
+          *xrpnt++ = 0.0;
+      }
+    }
+
+    /* 
+     * zero part
+     */
+    for(i=(&xr[SBLIMIT][0]-xrpnt)>>1;i;i--) {
+      *xrpnt++ = 0.0;
+      *xrpnt++ = 0.0;
+    }
+
+    gr_info->maxbandl = max+1;
+    gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
+  }
+
+  while( part2remain > 16 ) {
+    getbits(16); /* Dismiss stuffing Bits */
+    part2remain -= 16;
+  }
+  if(part2remain > 0)
+    getbits(part2remain);
+  else if(part2remain < 0) {
+    printf("\rCan't rewind stream by %d bits!                                    \n",(-part2remain));
+    return 1; /* -> error */
+  }
+  return 0;
+}
+
+static int III_dequantize_sample_ms(real xr[2][SBLIMIT][SSLIMIT],int *scf,
+   struct gr_info_s *gr_info,int sfreq,int part2bits)
+{
+  int shift = 1 + gr_info->scalefac_scale;
+  real *xrpnt = (real *) xr[1];
+  real *xr0pnt = (real *) xr[0];
+  int l[3],l3;
+  int part2remain = gr_info->part2_3_length - part2bits;
+  int *me;
+
+  {
+    int bv       = gr_info->big_values;
+    int region1  = gr_info->region1start;
+    int region2  = gr_info->region2start;
+
+    l3 = ((576>>1)-bv)>>1;   
+/*
+ * we may lose the 'odd' bit here !! 
+ * check this later gain 
+ */
+    if(bv <= region1) {
+      l[0] = bv; l[1] = 0; l[2] = 0;
+    }
+    else {
+      l[0] = region1;
+      if(bv <= region2) {
+        l[1] = bv - l[0];  l[2] = 0;
+      }
+      else {
+        l[1] = region2 - l[0]; l[2] = bv - region2;
+      }
+    }
+  }
+ 
+  if(gr_info->block_type == 2) {
+    int i,max[4];
+    int step=0,lwin=0,cb=0;
+    register real v = 0.0;
+    register int *m,mc = 0;
+
+    if(gr_info->mixed_block_flag) {
+      max[3] = -1;
+      max[0] = max[1] = max[2] = 2;
+      m = map[sfreq][0];
+      me = mapend[sfreq][0];
+    }
+    else {
+      max[0] = max[1] = max[2] = max[3] = -1;
+      /* max[3] not really needed in this case */
+      m = map[sfreq][1];
+      me = mapend[sfreq][1];
+    }
+
+    for(i=0;i<2;i++) {
+      int lp = l[i];
+      struct newhuff *h = ht+gr_info->table_select[i];
+      for(;lp;lp--,mc--) {
+        int x,y;
+
+        if(!mc) {
+          mc = *m++;
+          xrpnt = ((real *) xr[1]) + *m;
+          xr0pnt = ((real *) xr[0]) + *m++;
+          lwin = *m++;
+          cb = *m++;
+          if(lwin == 3) {
+            v = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
+            step = 1;
+          }
+          else {
+            v = Gainpow2(gr_info->full_gain[lwin] + ((*scf++) << shift));
+            step = 3;
+          }
+        }
+        {
+          register short *val = h->table;
+          while((y=*val++)<0) {
+            part2remain--;
+            if(part2remain < 0) return 0;
+            if (get1bit()) val -= y;
+//            if(part2remain<=0) return 0; // Arpi
+          }
+          x = y >> 4;
+          y &= 0xf;
+        }
+        if(x == 15) {
+          max[lwin] = cb;
+          part2remain -= h->linbits+1;
+          x += getbits(h->linbits);
+          if(get1bit()) {
+            real a = ispow[x] * v;
+            *xrpnt = *xr0pnt + a;
+            *xr0pnt -= a;
+          }
+          else {
+            real a = ispow[x] * v;
+            *xrpnt = *xr0pnt - a;
+            *xr0pnt += a;
+          }
+        }
+        else if(x) {
+          max[lwin] = cb;
+          if(get1bit()) {
+            real a = ispow[x] * v;
+            *xrpnt = *xr0pnt + a;
+            *xr0pnt -= a;
+          }
+          else {
+            real a = ispow[x] * v;
+            *xrpnt = *xr0pnt - a;
+            *xr0pnt += a;
+          }
+          part2remain--;
+        }
+        else
+          *xrpnt = *xr0pnt;
+        xrpnt += step;
+        xr0pnt += step;
+
+        if(y == 15) {
+          max[lwin] = cb;
+          part2remain -= h->linbits+1;
+          y += getbits(h->linbits);
+          if(get1bit()) {
+            real a = ispow[y] * v;
+            *xrpnt = *xr0pnt + a;
+            *xr0pnt -= a;
+          }
+          else {
+            real a = ispow[y] * v;
+            *xrpnt = *xr0pnt - a;
+            *xr0pnt += a;
+          }
+        }
+        else if(y) {
+          max[lwin] = cb;
+          if(get1bit()) {
+            real a = ispow[y] * v;
+            *xrpnt = *xr0pnt + a;
+            *xr0pnt -= a;
+          }
+          else {
+            real a = ispow[y] * v;
+            *xrpnt = *xr0pnt - a;
+            *xr0pnt += a;
+          }
+          part2remain--;
+        }
+        else
+          *xrpnt = *xr0pnt;
+        xrpnt += step;
+        xr0pnt += step;
+      }
+    }
+
+    for(;l3 && (part2remain > 0);l3--) {
+      struct newhuff *h = htc+gr_info->count1table_select;
+      register short *val = h->table,a;
+
+      while((a=*val++)<0) {
+        part2remain--;
+        if(part2remain < 0) {
+          part2remain++;
+          a = 0;
+          break;
+        }
+        if (get1bit())
+          val -= a;
+      }
+
+      for(i=0;i<4;i++) {
+        if(!(i & 1)) {
+