hqx: Store shareable data in main decoder context

[ffmpeg] / libavcodec / mathops.h

diff --git a/libavcodec/mathops.h b/libavcodec/mathops.h
index 45b1ecf1ae435d47601d24f5e5363d7edb4a0c13..7af13e19e016918a6d6516b8b62b2f513f6e2b50 100644 (file)
--- a/libavcodec/mathops.h
+++ b/libavcodec/mathops.h
@@ -22,9 +22,19 @@
 #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"
 #elif ARCH_AVR32
@@ -138,6 +148,13 @@ if ((y) < (x)) {\
 }
 #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
@@ -178,5 +195,38 @@ if ((y) < (x)) {\
 #   define PACK_2S16(a,b)    PACK_2U16((a)&0xffff, (b)&0xffff)
 #endif
 
-#endif /* AVCODEC_MATHOPS_H */
+#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 */