added / updated / corrected COPYING information in the core, aac, alac, adplug; renamed optmath.h to fastftoi.h

1 files changed, 159 insertions, 0 deletions

diff --git a/fastftoi.h b/fastftoi.h
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+++ b/fastftoi.h
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+// most of the code below was taken from libvorbis/vorbis/lib/os.h
+// under the conditions below
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+contents of the libvorbis COPYING:
+
+Copyright (c) 2002-2008 Xiph.org Foundation
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+- Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+- Neither the name of the Xiph.org Foundation nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __OPTMATH_H
+#define __OPTMATH_H
+
+#include <math.h>
+
+#ifdef __SSE2__ // that comes from -msse2
+#define __FORCE_SSE2__
+#endif
+
+/* Special i386 GCC implementation */
+#if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__) && !defined(__FORCE_SSE2__)
+#  define FPU_CONTROL
+/* both GCC and MSVC are kinda stupid about rounding/casting to int.
+   Because of encapsulation constraints (GCC can't see inside the asm
+   block and so we end up doing stupid things like a store/load that
+   is collectively a noop), we do it this way */
+
+/* we must set up the fpu before this works!! */
+
+typedef int16_t fpu_control;
+
+static inline void fpu_setround(fpu_control *fpu){
+  int16_t ret;
+  int16_t temp;
+  __asm__ __volatile__("fnstcw %0\n\t"
+	  "movw %0,%%dx\n\t"
+	  "orw $62463,%%dx\n\t"
+	  "movw %%dx,%1\n\t"
+	  "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
+  *fpu=ret;
+}
+
+static inline void fpu_restore(fpu_control fpu){
+  __asm__ __volatile__("fldcw %0":: "m"(fpu));
+}
+
+/* assumes the FPU is in round mode! */
+static inline int ftoi(double f){  /* yes, double!  Otherwise,
+                                             we get extra fst/fld to
+                                             truncate precision */
+  int i;
+  __asm__("fistl %0": "=m"(i) : "t"(f));
+  return(i);
+}
+#endif /* Special i386 GCC implementation */
+
+
+/* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
+ * 64 bit compiler */
+#if defined(_MSC_VER) && !defined(_WIN64)
+#  define FPU_CONTROL
+
+typedef int16_t fpu_control;
+
+static __inline int ftoi(double f){
+	int i;
+	__asm{
+		fld f
+		fistp i
+	}
+	return i;
+}
+
+static __inline void fpu_setround(fpu_control *fpu){
+}
+
+static __inline void fpu_restore(fpu_control fpu){
+}
+
+#endif /* Special MSVC 32 bit implementation */
+
+
+/* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
+   done safely because all x86_64 CPUs supports SSE2. */
+#if (defined(__FORCE_SSE2__)) || (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
+#pragma warning "using sse2 for ftoi"
+#  define FPU_CONTROL
+
+typedef int16_t fpu_control;
+
+#include <emmintrin.h>
+static __inline int ftoi(double f){
+        return _mm_cvtsd_si32(_mm_load_sd(&f));
+}
+
+static __inline void fpu_setround(fpu_control *fpu){
+}
+
+static __inline void fpu_restore(fpu_control fpu){
+}
+
+#endif /* Special MSVC x64 implementation */
+
+
+/* If no special implementation was found for the current compiler / platform,
+   use the default implementation here: */
+#ifndef FPU_CONTROL
+
+typedef int fpu_control;
+
+static int ftoi(double f){
+        /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
+           the floor() call is required to ensure correct roudning of
+           negative numbers */
+        return (int)floor(f+.5);
+}
+
+/* We don't have special code for this compiler/arch, so do it the slow way */
+#  define fpu_setround(fpu_control) {}
+#  define fpu_restore(fpu_control) {}
+
+#endif /* default implementation */
+
+#endif // __OPTMATH_H