Include toolame-dab as library

1 files changed, 361 insertions, 0 deletions

diff --git a/libtoolame-dab/pds_subband.c b/libtoolame-dab/pds_subband.c
new file mode 100644
index 0000000..04938c4
--- /dev/null
+++ b/libtoolame-dab/pds_subband.c
@@ -0,0 +1,361 @@
+#include "common.h"
+#include "encoder.h"
+
+void IDCT32 (double *, double *, int);
+
+/***********************************************************************
+ An implementation of a modified window subband as seen in Kumar & Zubair's
+"A high performance software implentation of mpeg audio encoder"
+I think from IEEE ASCAP 1996 proceedings
+ 
+input: shift in 32*12 (384) new samples into a 864 point buffer.
+ch - which channel we're looking at.
+ 
+This routine basically does 12 calls to window subband all in one go.
+Not yet called in code. here for testing only.
+************************************************************************/
+#define NEWWS
+void window_subband12 (short **buffer, int ch)
+{
+  static double x[2][864];	/* 2 channels, 864 buffer for each */
+  double *xk;
+  double t[12];			/* a temp buffer for summing values */
+  double y[12][64];		/* 12 output arrays of 64 values */
+  int i, j, k, m;
+  static double c[512];		/* enwindow array */
+  static int init = 0;
+  double c0;
+
+  if (!init) {
+    read_ana_window (c);
+    printf ("done init\n");
+    init++;
+  }
+
+  xk = x[ch];			/* an easier way of referencing the array */
+
+  /* shift 384 new samples into the buffer */
+  for (i = 863; i >= 384; i--)
+    xk[i] = xk[i - 384];
+  for (i = 383; i >= 0; i--)
+    xk[i] = (double) *(*buffer)++ / SCALE;
+
+  for (j = 0; j < 64; j++) {
+    for (k = 0; k < 12; k++)
+      t[k] = 0;
+    for (i = 0; i < 8; i++) {
+      m = i * 64 + j;
+      c0 = c[m];
+      t[0] += c0 * xk[m + 352];
+      t[1] += c0 * xk[m + 320];
+      t[2] += c0 * xk[m + 288];
+      t[3] += c0 * xk[m + 256];
+      t[4] += c0 * xk[m + 224];
+      t[5] += c0 * xk[m + 192];
+      t[6] += c0 * xk[m + 160];
+      t[7] += c0 * xk[m + 128];
+      t[8] += c0 * xk[m + 96];
+      t[9] += c0 * xk[m + 64];
+      t[10] += c0 * xk[m + 32];
+      t[11] += c0 * xk[m];
+    }
+    for (i = 0; i < 12; i++) {
+      y[i][j] = t[i];
+    }
+  }
+#define DB1x
+#ifdef DB1
+  for (i = 0; i < 12; i++) {
+    printf ("--%i--\n", i);
+    for (j = 0; j < 64; j++) {
+      printf ("%f\t", y[i][j]);
+      if ((j + 1) % 4 == 0)
+	printf ("\n");
+    }
+  }
+  exit (0);
+#endif
+}
+
+
+/************************************************************************/
+/*
+/* read_ana_window()
+/*
+/* PURPOSE:  Reads encoder window file "enwindow" into array #ana_win#
+/*
+/************************************************************************/
+
+void read_ana_window (ana_win)
+     double ana_win[HAN_SIZE];
+{
+  int i, j[4];
+  FILE *fp;
+  double f[4];
+  char t[150];
+
+  if (!(fp = OpenTableFile ("enwindow"))) {
+    printf ("Please check analysis window table 'enwindow'\n");
+    exit (1);
+  }
+  for (i = 0; i < 512; i += 4) {
+    fgets (t, 150, fp);
+    sscanf (t, "C[%d] = %lf C[%d] = %lf C[%d] = %lf C[%d] = %lf\n", j, f,
+	    j + 1, f + 1, j + 2, f + 2, j + 3, f + 3);
+    if (i == j[0]) {
+      ana_win[i] = f[0];
+      ana_win[i + 1] = f[1];
+      ana_win[i + 2] = f[2];
+      ana_win[i + 3] = f[3];
+    } else {
+      printf ("Check index in analysis window table\n");
+      exit (1);
+    }
+    fgets (t, 150, fp);
+  }
+  fclose (fp);
+}
+
+/************************************************************************/
+/*
+/* window_subband()
+/*
+/* PURPOSE:  Overlapping window on PCM samples
+/*
+/* SEMANTICS:
+/* 32 16-bit pcm samples are scaled to fractional 2's complement and
+/* concatenated to the end of the window buffer #x#. The updated window
+/* buffer #x# is then windowed by the analysis window #c# to produce the
+/* windowed sample #z#
+/*
+/************************************************************************/
+#ifdef COMBWS
+void window_subband (short **buffer, double s[SBLIMIT], int k, int sblimit)
+{
+  typedef double XX[2][HAN_SIZE];
+  static XX *x;
+  double *xk;
+  int i;
+  static int off[2] = { 0, 0 };
+  static char init = 0;
+  double t;
+  static double enwindow[512];
+  double *ep0, *ep1, *ep2, *ep3, *ep4, *ep5, *ep6, *ep7;
+  double z[64];
+  double yprime[32];
+  if (!init) {
+    read_ana_window (enwindow);
+    x = (XX *) mem_alloc (sizeof (XX), "x");
+    memset (x, 0, 2 * HAN_SIZE * sizeof (double));
+    init = 1;
+  }
+  xk = (*x)[k];
+
+  /* replace 32 oldest samples with 32 new samples */
+  for (i = 0; i < 32; i++)
+    xk[31 - i + off[k]] = (double) *(*buffer)++ / SCALE;
+
+  ep0 = &enwindow[0];
+  ep1 = &enwindow[64];
+  ep2 = &enwindow[128];
+  ep3 = &enwindow[192];
+  ep4 = &enwindow[256];
+  ep5 = &enwindow[320];
+  ep6 = &enwindow[384];
+  ep7 = &enwindow[448];
+
+  /* shift samples into proper window positions */
+  for (i = 0; i < 64; i++) {
+    t = xk[(i + off[k]) & (512 - 1)] * *ep0++;
+    t += xk[(i + 64 + off[k]) & (512 - 1)] * *ep1++;
+    t += xk[(i + 128 + off[k]) & (512 - 1)] * *ep2++;
+    t += xk[(i + 192 + off[k]) & (512 - 1)] * *ep3++;
+    t += xk[(i + 256 + off[k]) & (512 - 1)] * *ep4++;
+    t += xk[(i + 320 + off[k]) & (512 - 1)] * *ep5++;
+    t += xk[(i + 384 + off[k]) & (512 - 1)] * *ep6++;
+    t += xk[(i + 448 + off[k]) & (512 - 1)] * *ep7++;
+    z[i] = t;
+  }
+
+  off[k] += 480;		/*offset is modulo (HAN_SIZE-1) */
+  off[k] &= HAN_SIZE - 1;
+
+  yprime[0] = z[16];
+  for (i = 1; i <= 16; i++)
+    yprime[i] = z[i + 16] + z[16 - i];
+  for (i = 17; i <= 31; i++)
+    yprime[i] = z[i + 16] - z[80 - i];
+  IDCT32 (yprime, s, sblimit);
+  /*    filter_subband (z,s);  */
+}
+#else
+void window_subband (short **buffer, double z[64], int k)
+{
+  typedef double XX[2][HAN_SIZE];
+  static XX *x;
+  double *xk;
+  int i;
+  static int off[2] = { 0, 0 };
+  static char init = 0;
+  double t;
+  static double enwindow[512];
+  double *ep0, *ep1, *ep2, *ep3, *ep4, *ep5, *ep6, *ep7;
+  if (!init) {
+    read_ana_window (enwindow);
+    x = (XX *) mem_alloc (sizeof (XX), "x");
+    memset (x, 0, 2 * HAN_SIZE * sizeof (double));
+    init = 1;
+  }
+  xk = (*x)[k];
+
+  /* replace 32 oldest samples with 32 new samples */
+  /* PDS old code:   */
+  /* for (i=0;i<32;i++)
+     xk[31-i+off[k]] = (double) *(*buffer)++/SCALE;
+   */
+  {
+    register double *xk_t = xk + off[k];
+    for (i = 32; i--;)
+      xk_t[i] = (double) *(*buffer)++;
+  }
+
+  ep0 = &enwindow[0];
+  ep1 = &enwindow[64];
+  ep2 = &enwindow[128];
+  ep3 = &enwindow[192];
+  ep4 = &enwindow[256];
+  ep5 = &enwindow[320];
+  ep6 = &enwindow[384];
+  ep7 = &enwindow[448];
+
+  /* shift samples into proper window positions */
+  for (i = 0; i < 64; i++) {
+    t = xk[(i + off[k]) & (512 - 1)] * *ep0++;
+    t += xk[(i + 64 + off[k]) & (512 - 1)] * *ep1++;
+    t += xk[(i + 128 + off[k]) & (512 - 1)] * *ep2++;
+    t += xk[(i + 192 + off[k]) & (512 - 1)] * *ep3++;
+    t += xk[(i + 256 + off[k]) & (512 - 1)] * *ep4++;
+    t += xk[(i + 320 + off[k]) & (512 - 1)] * *ep5++;
+    t += xk[(i + 384 + off[k]) & (512 - 1)] * *ep6++;
+    t += xk[(i + 448 + off[k]) & (512 - 1)] * *ep7++;
+    z[i] = t;
+  }
+
+  off[k] += 480;		/*offset is modulo (HAN_SIZE-1) */
+  off[k] &= HAN_SIZE - 1;
+
+}
+#endif
+/************************************************************************/
+/*
+/* create_ana_filter()
+/*
+/* PURPOSE:  Calculates the analysis filter bank coefficients
+/*
+/* SEMANTICS:
+/* Calculates the analysis filterbank coefficients and rounds to the
+/* 9th decimal place accuracy of the filterbank tables in the ISO
+/* document.  The coefficients are stored in #filter#
+/*
+/************************************************************************/
+
+void create_ana_filter (filter)
+     double filter[SBLIMIT][64];
+{
+  register int i, k;
+
+  for (i = 0; i < 32; i++)
+    for (k = 0; k < 64; k++) {
+      if ((filter[i][k] =
+	   1e9 * cos ((double) ((2 * i + 1) * (16 - k) * PI64))) >= 0)
+	modf (filter[i][k] + 0.5, &filter[i][k]);
+      else
+	modf (filter[i][k] - 0.5, &filter[i][k]);
+      filter[i][k] *= 1e-9;
+    }
+}
+
+/************************************************************************
+*
+* filter_subband()
+*
+* PURPOSE:  Calculates the analysis filter bank coefficients
+*
+* SEMANTICS:
+*      The windowed samples #z# is filtered by the digital filter matrix #m#
+* to produce the subband samples #s#. This done by first selectively
+* picking out values from the windowed samples, and then multiplying
+* them by the filter matrix, producing 32 subband samples.
+*
+************************************************************************/
+void create_dct_matrix (filter)
+     double filter[16][32];
+{
+  register int i, k;
+
+  for (i = 0; i < 16; i++)
+    for (k = 0; k < 32; k++) {
+      if ((filter[i][k] = 1e9 * cos ((double) ((2 * i + 1) * k * PI64))) >= 0)
+	modf (filter[i][k] + 0.5, &filter[i][k]);
+      else
+	modf (filter[i][k] - 0.5, &filter[i][k]);
+      filter[i][k] *= 1e-9;
+      filter[i][k] /= (double) SCALE;	/* PDS */
+    }
+  /* PDS this code could/should be replaced; use simple cos  */
+  /* and don't do additional rounding ??? See LAME(e.g.3.34) */
+}
+
+void IDCT32 (xin, xout, sblimit)
+     double *xin, *xout;
+     int sblimit;
+{
+  int i, j;
+  double s0, s1;
+  typedef double MM[16][32];
+  static MM *m = 0;
+  if (m == 0) {
+    m = (MM *) mem_alloc (sizeof (MM), "filter");
+    create_dct_matrix (*m);
+  }
+  /* Only compute subband filter info for frequency ranges which */
+  /* will be really needed/encoded later. Code is "general", but */
+  /* only produces speed up in low qual/bps coding situations.   */
+  /* Added/adapted by PDS Oct 1999.                              */
+  for (i = ((sblimit > 16) ? SBLIMIT - sblimit : sblimit); i--;) {
+    s0 = 0.0;
+    for (j = 0; j < 32; j++) {
+      s0 += (*m)[i][j] * xin[j + 0];
+    }
+    xout[i] = s0;
+  }
+  for (i = SBLIMIT - sblimit; i < 16; i++) {
+    s0 = s1 = 0.0;
+    for (j = 0; j < 32; j += 2) {
+      s0 += (*m)[i][j] * xin[j];
+      s1 += (*m)[i][j + 1] * xin[j + 1];
+    }
+    xout[i] = s0 + s1;
+    xout[31 - i] = s0 - s1;
+  }
+  /* PDS TODO: use pointers instead of arrays ???  */
+  /* PDS TODO: is '--' j loop faster then original */
+  /* code:   ' for( j=0; j<32; j+=2 )  { ... } ' ? */
+}
+
+void filter_subband (z, s, sblimit)
+     double z[HAN_SIZE], s[SBLIMIT];
+     int sblimit;
+{
+  double yprime[32];
+  int i, j;
+
+  {
+    yprime[0] = z[16];
+    for (i = 1; i <= 16; i++)
+      yprime[i] = z[i + 16] + z[16 - i];
+    for (i = 17; i <= 31; i++)
+      yprime[i] = z[i + 16] - z[80 - i];
+    IDCT32 (yprime, s, sblimit);
+  }
+}