X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmathops.h;h=7af13e19e016918a6d6516b8b62b2f513f6e2b50;hb=f86f39cb9b1fcd063d5e4812132a75c06cc7acd2;hp=4e24350ef25e6d384d1a6e5ea9e4a6ad9f2a5cbc;hpb=b7904f78c1d6fd081b18b506f819e2186d9e0ae1;p=ffmpeg

diff --git a/libavcodec/mathops.h b/libavcodec/mathops.h
index 4e24350ef25..7af13e19e01 100644
--- a/libavcodec/mathops.h
+++ b/libavcodec/mathops.h
@@ -3,26 +3,37 @@
  * Copyright (c) 2001, 2002 Fabrice Bellard
  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef AVCODEC_MATHOPS_H
 #define AVCODEC_MATHOPS_H
 
+#include <stdint.h>
+
 #include "libavutil/common.h"
+#include "config.h"
+
+#define MAX_NEG_CROP 1024
+
+extern const uint32_t ff_inverse[257];
+extern const uint8_t  ff_reverse[256];
+extern const uint8_t ff_sqrt_tab[256];
+extern const uint8_t ff_crop_tab[256 + 2 * MAX_NEG_CROP];
+extern const uint8_t ff_zigzag_direct[64];
 
 #if   ARCH_ARM
 #   include "arm/mathops.h"
@@ -40,21 +51,24 @@
 
 /* generic implementation */
 
+#ifndef MUL64
+#   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
+#endif
+
 #ifndef MULL
-#   define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
+#   define MULL(a,b,s) (MUL64(a, b) >> (s))
 #endif
 
 #ifndef MULH
-//gcc 3.4 creates an incredibly bloated mess out of this
-//#    define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
-
 static av_always_inline int MULH(int a, int b){
-    return ((int64_t)(a) * (int64_t)(b))>>32;
+    return MUL64(a, b) >> 32;
 }
 #endif
 
-#ifndef MUL64
-#   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
+#ifndef UMULH
+static av_always_inline unsigned UMULH(unsigned a, unsigned b){
+    return ((uint64_t)(a) * (uint64_t)(b))>>32;
+}
 #endif
 
 #ifndef MAC64
@@ -112,9 +126,107 @@ static inline av_const int mid_pred(int a, int b, int c)
 #ifndef sign_extend
 static inline av_const int sign_extend(int val, unsigned bits)
 {
-    return (val << (INT_BIT - bits)) >> (INT_BIT - bits);
+    unsigned shift = 8 * sizeof(int) - bits;
+    union { unsigned u; int s; } v = { (unsigned) val << shift };
+    return v.s >> shift;
 }
 #endif
 
-#endif /* AVCODEC_MATHOPS_H */
+#ifndef zero_extend
+static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
+{
+    return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
+}
+#endif
+
+#ifndef COPY3_IF_LT
+#define COPY3_IF_LT(x, y, a, b, c, d)\
+if ((y) < (x)) {\
+    (x) = (y);\
+    (a) = (b);\
+    (c) = (d);\
+}
+#endif
+
+#ifndef MASK_ABS
+#define MASK_ABS(mask, level) do {              \
+        mask  = level >> 31;                    \
+        level = (level ^ mask) - mask;          \
+    } while (0)
+#endif
+
+#ifndef NEG_SSR32
+#   define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
+#endif
 
+#ifndef NEG_USR32
+#   define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
+#endif
+
+#if HAVE_BIGENDIAN
+# ifndef PACK_2U8
+#   define PACK_2U8(a,b)     (((a) <<  8) | (b))
+# endif
+# ifndef PACK_4U8
+#   define PACK_4U8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
+# endif
+# ifndef PACK_2U16
+#   define PACK_2U16(a,b)    (((a) << 16) | (b))
+# endif
+#else
+# ifndef PACK_2U8
+#   define PACK_2U8(a,b)     (((b) <<  8) | (a))
+# endif
+# ifndef PACK_4U2
+#   define PACK_4U8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
+# endif
+# ifndef PACK_2U16
+#   define PACK_2U16(a,b)    (((b) << 16) | (a))
+# endif
+#endif
+
+#ifndef PACK_2S8
+#   define PACK_2S8(a,b)     PACK_2U8((a)&255, (b)&255)
+#endif
+#ifndef PACK_4S8
+#   define PACK_4S8(a,b,c,d) PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255)
+#endif
+#ifndef PACK_2S16
+#   define PACK_2S16(a,b)    PACK_2U16((a)&0xffff, (b)&0xffff)
+#endif
+
+#ifndef FASTDIV
+#   define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
+#endif /* FASTDIV */
+
+static inline av_const unsigned int ff_sqrt(unsigned int a)
+{
+    unsigned int b;
+
+    if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4;
+    else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2;
+#if !CONFIG_SMALL
+    else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1;
+    else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8]   ;
+#endif
+    else {
+        int s = av_log2_16bit(a >> 16) >> 1;
+        unsigned int c = a >> (s + 2);
+        b = ff_sqrt_tab[c >> (s + 8)];
+        b = FASTDIV(c,b) + (b << s);
+    }
+
+    return b - (a < b * b);
+}
+
+static inline int8_t ff_u8_to_s8(uint8_t a)
+{
+    union {
+        uint8_t u8;
+        int8_t  s8;
+    } b;
+    b.u8 = a;
+    return b.s8;
+}
+
+#endif /* AVCODEC_MATHOPS_H */