Improvements from Matjaz Thaler

1 files changed, 93 insertions, 0 deletions

diff --git a/ac3dec/srfft_kni_c.c b/ac3dec/srfft_kni_c.c
new file mode 100644
index 00000000..d461110f
--- /dev/null
+++ b/ac3dec/srfft_kni_c.c
@@ -0,0 +1,93 @@
+/* 
+ *  srfft_kni.c
+ *
+ *  Copyright (C) Yuqing Deng <Yuqing_Deng@brown.edu> - April 2000
+ *
+ *  64 and 128 point split radix fft for ac3dec
+ *
+ *  The algorithm is desribed in the book:
+ *  "Computational Frameworks of the Fast Fourier Transform".
+ *
+ *  The ideas and the the organization of code borrowed from djbfft written by
+ *  D. J. Bernstein <djb@cr.py.to>.  djbff can be found at 
+ *  http://cr.yp.to/djbfft.html.
+ *
+ *  srfft.c 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, or (at your option)
+ *  any later version.
+ *
+ *  srfft.c 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __i386__
+
+#include <stdio.h>
+
+#include "srfft_kni.h"
+#include "srfftp.h"
+
+void fft_64p_kni(complex_t *a)
+{
+	fft_8_kni(&a[0]); fft_4_kni(&a[8]); fft_4_kni(&a[12]);
+	fft_asmb_kni(2, &a[0], &a[8], &delta16[0], &delta16_3[0]);
+  
+	fft_8_kni(&a[16]), fft_8_kni(&a[24]);
+	fft_asmb_kni(4, &a[0], &a[16],&delta32[0], &delta32_3[0]);
+
+	fft_8_kni(&a[32]); fft_4_kni(&a[40]); fft_4_kni(&a[44]);
+	fft_asmb_kni(2, &a[32], &a[40], &delta16[0], &delta16_3[0]);
+
+	fft_8_kni(&a[48]); fft_4_kni(&a[56]); fft_4_kni(&a[60]);
+	fft_asmb_kni(2, &a[48], &a[56], &delta16[0], &delta16_3[0]);
+
+	fft_asmb_kni(8, &a[0], &a[32],&delta64[0], &delta64_3[0]);
+}
+
+
+void fft_128p_kni(complex_t *a)
+{
+	fft_8_kni(&a[0]); fft_4_kni(&a[8]); fft_4_kni(&a[12]);
+	fft_asmb_kni(2, &a[0], &a[8], &delta16[0], &delta16_3[0]);
+  
+	fft_8_kni(&a[16]), fft_8_kni(&a[24]);
+	fft_asmb_kni(4, &a[0], &a[16],&delta32[0], &delta32_3[0]);
+
+	fft_8_kni(&a[32]); fft_4_kni(&a[40]); fft_4_kni(&a[44]);
+	fft_asmb_kni(2, &a[32], &a[40], &delta16[0], &delta16_3[0]);
+
+	fft_8_kni(&a[48]); fft_4_kni(&a[56]); fft_4_kni(&a[60]);
+	fft_asmb_kni(2, &a[48], &a[56], &delta16[0], &delta16_3[0]);
+
+	fft_asmb_kni(8, &a[0], &a[32],&delta64[0], &delta64_3[0]);
+
+	fft_8_kni(&a[64]); fft_4_kni(&a[72]); fft_4_kni(&a[76]);
+	/* fft_16(&a[64]); */
+	fft_asmb_kni(2, &a[64], &a[72], &delta16[0], &delta16_3[0]);
+
+	fft_8_kni(&a[80]); fft_8_kni(&a[88]);
+  
+	/* fft_32(&a[64]); */
+	fft_asmb_kni(4, &a[64], &a[80],&delta32[0], &delta32_3[0]);
+
+	fft_8_kni(&a[96]); fft_4_kni(&a[104]), fft_4_kni(&a[108]);
+	/* fft_16(&a[96]); */
+	fft_asmb_kni(2, &a[96], &a[104], &delta16[0], &delta16_3[0]);
+
+	fft_8_kni(&a[112]), fft_8_kni(&a[120]);
+	/* fft_32(&a[96]); */
+	fft_asmb_kni(4, &a[96], &a[112], &delta32[0], &delta32_3[0]);
+  
+	/* fft_128(&a[0]); */
+	fft_asmb_kni(16, &a[0], &a[64], &delta128[0], &delta128_3[0]);
+}
+
+#endif