1 files changed, 209 insertions, 13 deletions

diff --git a/core/multimedia/opieplayer/libmad/layer3.c b/core/multimedia/opieplayer/libmad/layer3.c
index 03f13fe..3c5dd9e 100644
--- a/core/multimedia/opieplayer/libmad/layer3.c
+++ b/core/multimedia/opieplayer/libmad/layer3.c
@@ -1,9 +1,9 @@
 /*
  * libmad - MPEG audio decoder library
- * Copyright (C) 2000-2001 Robert Leslie
+ * Copyright (C) 2000-2004 Underbit Technologies, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
@@ -285,14 +285,14 @@ unsigned char const sfb_8000_short[] = {
   36,  2,  2,  2,  2,  2,  2,  2,  2,  2, 26, 26, 26
 };
 
 # define sfb_12000_mixed  sfb_16000_mixed
 # define sfb_11025_mixed  sfb_12000_mixed
 
-/* the 8000 Hz short block scalefactor bands do not break after the first 36
-   frequency lines, so this is probably wrong */
+/* the 8000 Hz short block scalefactor bands do not break after
+   the first 36 frequency lines, so this is probably wrong */
 static
 unsigned char const sfb_8000_mixed[] = {
   /* long */  12, 12, 12,
   /* short */  4,  4,  4,  8,  8,  8, 12, 12, 12, 16, 16, 16,
               20, 20, 20, 24, 24, 24, 28, 28, 28, 36, 36, 36,
                2,  2,  2,  2,  2,  2,  2,  2,  2, 26, 26, 26
@@ -1572,12 +1572,199 @@ void III_aliasreduce(mad_fixed_t xr[576], int lines)
   }
 }
 
 # if defined(ASO_IMDCT)
 void III_imdct_l(mad_fixed_t const [18], mad_fixed_t [36], unsigned int);
 # else
+#  if 1
+static
+void fastsdct(mad_fixed_t const x[9], mad_fixed_t y[18])
+{
+  mad_fixed_t a0,  a1,  a2,  a3,  a4,  a5,  a6,  a7,  a8,  a9,  a10, a11, a12;
+  mad_fixed_t a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25;
+  mad_fixed_t m0,  m1,  m2,  m3,  m4,  m5,  m6,  m7;
+
+  enum {
+    c0 =  MAD_F(0x1f838b8d),  /* 2 * cos( 1 * PI / 18) */
+    c1 =  MAD_F(0x1bb67ae8),  /* 2 * cos( 3 * PI / 18) */
+    c2 =  MAD_F(0x18836fa3),  /* 2 * cos( 4 * PI / 18) */
+    c3 =  MAD_F(0x1491b752),  /* 2 * cos( 5 * PI / 18) */
+    c4 =  MAD_F(0x0af1d43a),  /* 2 * cos( 7 * PI / 18) */
+    c5 =  MAD_F(0x058e86a0),  /* 2 * cos( 8 * PI / 18) */
+    c6 = -MAD_F(0x1e11f642)   /* 2 * cos(16 * PI / 18) */
+  };
+
+  a0 = x[3] + x[5];
+  a1 = x[3] - x[5];
+  a2 = x[6] + x[2];
+  a3 = x[6] - x[2];
+  a4 = x[1] + x[7];
+  a5 = x[1] - x[7];
+  a6 = x[8] + x[0];
+  a7 = x[8] - x[0];
+
+  a8  = a0  + a2;
+  a9  = a0  - a2;
+  a10 = a0  - a6;
+  a11 = a2  - a6;
+  a12 = a8  + a6;
+  a13 = a1  - a3;
+  a14 = a13 + a7;
+  a15 = a3  + a7;
+  a16 = a1  - a7;
+  a17 = a1  + a3;
+
+  m0 = mad_f_mul(a17, -c3);
+  m1 = mad_f_mul(a16, -c0);
+  m2 = mad_f_mul(a15, -c4);
+  m3 = mad_f_mul(a14, -c1);
+  m4 = mad_f_mul(a5,  -c1);
+  m5 = mad_f_mul(a11, -c6);
+  m6 = mad_f_mul(a10, -c5);
+  m7 = mad_f_mul(a9,  -c2);
+
+  a18 =     x[4] + a4;
+  a19 = 2 * x[4] - a4;
+  a20 = a19 + m5;
+  a21 = a19 - m5;
+  a22 = a19 + m6;
+  a23 = m4  + m2;
+  a24 = m4  - m2;
+  a25 = m4  + m1;
+
+  /* output to every other slot for convenience */
+
+  y[ 0] = a18 + a12;
+  y[ 2] = m0  - a25;
+  y[ 4] = m7  - a20;
+  y[ 6] = m3;
+  y[ 8] = a21 - m6;
+  y[10] = a24 - m1;
+  y[12] = a12 - 2 * a18;
+  y[14] = a23 + m0;
+  y[16] = a22 + m7;
+}
+
+static inline
+void sdctII(mad_fixed_t const x[18], mad_fixed_t X[18])
+{
+  mad_fixed_t tmp[9];
+  int i;
+
+  /* scale[i] = 2 * cos(PI * (2 * i + 1) / (2 * 18)) */
+  static mad_fixed_t const scale[9] = {
+    MAD_F(0x1fe0d3b4), MAD_F(0x1ee8dd47), MAD_F(0x1d007930),
+    MAD_F(0x1a367e59), MAD_F(0x16a09e66), MAD_F(0x125abcf8),
+    MAD_F(0x0d8616bc), MAD_F(0x08483ee1), MAD_F(0x02c9fad7)
+  };
+
+  /* divide the 18-point SDCT-II into two 9-point SDCT-IIs */
+
+  /* even input butterfly */
+
+  for (i = 0; i < 9; i += 3) {
+    tmp[i + 0] = x[i + 0] + x[18 - (i + 0) - 1];
+    tmp[i + 1] = x[i + 1] + x[18 - (i + 1) - 1];
+    tmp[i + 2] = x[i + 2] + x[18 - (i + 2) - 1];
+  }
+
+  fastsdct(tmp, &X[0]);
+
+  /* odd input butterfly and scaling */
+
+  for (i = 0; i < 9; i += 3) {
+    tmp[i + 0] = mad_f_mul(x[i + 0] - x[18 - (i + 0) - 1], scale[i + 0]);
+    tmp[i + 1] = mad_f_mul(x[i + 1] - x[18 - (i + 1) - 1], scale[i + 1]);
+    tmp[i + 2] = mad_f_mul(x[i + 2] - x[18 - (i + 2) - 1], scale[i + 2]);
+  }
+
+  fastsdct(tmp, &X[1]);
+
+  /* output accumulation */
+
+  for (i = 3; i < 18; i += 8) {
+    X[i + 0] -= X[(i + 0) - 2];
+    X[i + 2] -= X[(i + 2) - 2];
+    X[i + 4] -= X[(i + 4) - 2];
+    X[i + 6] -= X[(i + 6) - 2];
+  }
+}
+
+static inline
+void dctIV(mad_fixed_t const y[18], mad_fixed_t X[18])
+{
+  mad_fixed_t tmp[18];
+  int i;
+
+  /* scale[i] = 2 * cos(PI * (2 * i + 1) / (4 * 18)) */
+  static mad_fixed_t const scale[18] = {
+    MAD_F(0x1ff833fa), MAD_F(0x1fb9ea93), MAD_F(0x1f3dd120),
+    MAD_F(0x1e84d969), MAD_F(0x1d906bcf), MAD_F(0x1c62648b),
+    MAD_F(0x1afd100f), MAD_F(0x1963268b), MAD_F(0x1797c6a4),
+    MAD_F(0x159e6f5b), MAD_F(0x137af940), MAD_F(0x11318ef3),
+    MAD_F(0x0ec6a507), MAD_F(0x0c3ef153), MAD_F(0x099f61c5),
+    MAD_F(0x06ed12c5), MAD_F(0x042d4544), MAD_F(0x0165547c)
+  };
+
+  /* scaling */
+
+  for (i = 0; i < 18; i += 3) {
+    tmp[i + 0] = mad_f_mul(y[i + 0], scale[i + 0]);
+    tmp[i + 1] = mad_f_mul(y[i + 1], scale[i + 1]);
+    tmp[i + 2] = mad_f_mul(y[i + 2], scale[i + 2]);
+  }
+
+  /* SDCT-II */
+
+  sdctII(tmp, X);
+
+  /* scale reduction and output accumulation */
+
+  X[0] /= 2;
+  for (i = 1; i < 17; i += 4) {
+    X[i + 0] = X[i + 0] / 2 - X[(i + 0) - 1];
+    X[i + 1] = X[i + 1] / 2 - X[(i + 1) - 1];
+    X[i + 2] = X[i + 2] / 2 - X[(i + 2) - 1];
+    X[i + 3] = X[i + 3] / 2 - X[(i + 3) - 1];
+  }
+  X[17] = X[17] / 2 - X[16];
+}
+
+/*
+         * NAME:imdct36
+         * DESCRIPTION:perform X[18]->x[36] IMDCT using Szu-Wei Lee's fast algorithm
+ */
+static inline
+void imdct36(mad_fixed_t const x[18], mad_fixed_t y[36])
+{
+  mad_fixed_t tmp[18];
+  int i;
+
+  /* DCT-IV */
+
+  dctIV(x, tmp);
+
+  /* convert 18-point DCT-IV to 36-point IMDCT */
+
+  for (i =  0; i <  9; i += 3) {
+    y[i + 0] =  tmp[9 + (i + 0)];
+    y[i + 1] =  tmp[9 + (i + 1)];
+    y[i + 2] =  tmp[9 + (i + 2)];
+  }
+  for (i =  9; i < 27; i += 3) {
+    y[i + 0] = -tmp[36 - (9 + (i + 0)) - 1];
+    y[i + 1] = -tmp[36 - (9 + (i + 1)) - 1];
+    y[i + 2] = -tmp[36 - (9 + (i + 2)) - 1];
+  }
+  for (i = 27; i < 36; i += 3) {
+    y[i + 0] = -tmp[(i + 0) - 27];
+    y[i + 1] = -tmp[(i + 1) - 27];
+    y[i + 2] = -tmp[(i + 2) - 27];
+  }
+}
+#  else
 /*
          * NAME:imdct36
          * DESCRIPTION:perform X[18]->x[36] IMDCT
  */
 static inline
 void imdct36(mad_fixed_t const X[18], mad_fixed_t x[36])
@@ -1862,12 +2049,13 @@ void imdct36(mad_fixed_t const X[18], mad_fixed_t x[36])
   MAD_F_MLA(hi, lo, X[14], -MAD_F(0x04cfb0e2));
   MAD_F_MLA(hi, lo, X[15], -MAD_F(0x03768962));
   MAD_F_MLA(hi, lo, X[17], -MAD_F(0x00b2aa3e));
 
   x[26] = x[27] = MAD_F_MLZ(hi, lo) + t5;
 }
+#  endif
 
 /*
          * NAME:III_imdct_l()
          * DESCRIPTION:perform IMDCT and windowing for long blocks
  */
 static
@@ -1926,23 +2114,31 @@ void III_imdct_l(mad_fixed_t const X[18], mad_fixed_t z[36],
 # else
     for (i =  0; i < 36; ++i) z[i] = mad_f_mul(z[i], window_l[i]);
 # endif
     break;
 
   case 1:  /* start block */
-    for (i =  0; i < 18; ++i) z[i] = mad_f_mul(z[i], window_l[i]);
+    for (i =  0; i < 18; i += 3) {
+      z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
+      z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
+      z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
+    }
     /*  (i = 18; i < 24; ++i) z[i] unchanged */
     for (i = 24; i < 30; ++i) z[i] = mad_f_mul(z[i], window_s[i - 18]);
     for (i = 30; i < 36; ++i) z[i] = 0;
     break;
 
   case 3:  /* stop block */
     for (i =  0; i <  6; ++i) z[i] = 0;
     for (i =  6; i < 12; ++i) z[i] = mad_f_mul(z[i], window_s[i - 6]);
     /*  (i = 12; i < 18; ++i) z[i] unchanged */
-    for (i = 18; i < 36; ++i) z[i] = mad_f_mul(z[i], window_l[i]);
+    for (i = 18; i < 36; i += 3) {
+      z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
+      z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
+      z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
+    }
     break;
   }
 }
 # endif  /* ASO_IMDCT */
 
 /*
@@ -2039,37 +2235,37 @@ void III_overlap(mad_fixed_t const output[36], mad_fixed_t overlap[18],
     register mad_fixed_t tmp1, tmp2;
 
     tmp1 = overlap[0];
     tmp2 = overlap[1];
 
     for (i = 0; i < 16; i += 2) {
-      sample[i + 0][sb] = output[i + 0] + tmp1;
+      sample[i + 0][sb] = output[i + 0 +  0] + tmp1;
       overlap[i + 0]    = output[i + 0 + 18];
       tmp1 = overlap[i + 2];
 
-      sample[i + 1][sb] = output[i + 1] + tmp2;
+      sample[i + 1][sb] = output[i + 1 +  0] + tmp2;
       overlap[i + 1]    = output[i + 1 + 18];
       tmp2 = overlap[i + 3];
     }
 
-    sample[16][sb] = output[16] + tmp1;
+    sample[16][sb] = output[16 +  0] + tmp1;
     overlap[16]    = output[16 + 18];
-    sample[17][sb] = output[17] + tmp2;
+    sample[17][sb] = output[17 +  0] + tmp2;
     overlap[17]    = output[17 + 18];
   }
 # elif 0
   for (i = 0; i < 18; i += 2) {
-    sample[i + 0][sb] = output[i + 0] + overlap[i + 0];
+    sample[i + 0][sb] = output[i + 0 +  0] + overlap[i + 0];
     overlap[i + 0]    = output[i + 0 + 18];
 
-    sample[i + 1][sb] = output[i + 1] + overlap[i + 1];
+    sample[i + 1][sb] = output[i + 1 +  0] + overlap[i + 1];
     overlap[i + 1]    = output[i + 1 + 18];
   }
 # else
   for (i = 0; i < 18; ++i) {
-    sample[i][sb] = output[i] + overlap[i];
+    sample[i][sb] = output[i +  0] + overlap[i];
     overlap[i]    = output[i + 18];
   }
 # endif
 }
 
 /*
@@ -2451,18 +2647,18 @@ int mad_layer_III(struct mad_stream *stream, struct mad_frame *frame)
   if (result == 0) {
     error = III_decode(&ptr, frame, &si, nch);
     if (error) {
       stream->error = error;
       result = -1;
     }
-  }
 
   /* designate ancillary bits */
 
   stream->anc_ptr    = ptr;
   stream->anc_bitlen = md_len * CHAR_BIT - data_bitlen;
+  }
 
 # if 0 && defined(DEBUG)
   fprintf(stderr,
           "main_data_begin:%u, md_len:%u, frame_free:%u, "
           "data_bitlen:%u, anc_bitlen: %u\n",
           si.main_data_begin, md_len, frame_free,