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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /media/libav/libavutil/intmath.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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diff --git a/media/libav/libavutil/intmath.h b/media/libav/libavutil/intmath.h
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+/*
+ * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
+ *
+ * This file is part of Libav.
+ *
+ * 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.
+ *
+ * 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_INTMATH_H
+#define AVUTIL_INTMATH_H
+
+#include <stdint.h>
+
+#include "config.h"
+#include "attributes.h"
+
+#if ARCH_ARM
+# include "arm/intmath.h"
+#endif
+
+/**
+ * @addtogroup lavu_internal
+ * @{
+ */
+
+#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
+
+#ifndef ff_log2
+# define ff_log2(x) (31 - __builtin_clz((x)|1))
+# ifndef ff_log2_16bit
+# define ff_log2_16bit av_log2
+# endif
+#endif /* ff_log2 */
+
+#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
+
+extern const uint8_t ff_log2_tab[256];
+
+#ifndef ff_log2
+#define ff_log2 ff_log2_c
+static av_always_inline av_const int ff_log2_c(unsigned int v)
+{
+ int n = 0;
+ if (v & 0xffff0000) {
+ v >>= 16;
+ n += 16;
+ }
+ if (v & 0xff00) {
+ v >>= 8;
+ n += 8;
+ }
+ n += ff_log2_tab[v];
+
+ return n;
+}
+#endif
+
+#ifndef ff_log2_16bit
+#define ff_log2_16bit ff_log2_16bit_c
+static av_always_inline av_const int ff_log2_16bit_c(unsigned int v)
+{
+ int n = 0;
+ if (v & 0xff00) {
+ v >>= 8;
+ n += 8;
+ }
+ n += ff_log2_tab[v];
+
+ return n;
+}
+#endif
+
+#define av_log2 ff_log2
+#define av_log2_16bit ff_log2_16bit
+
+/**
+ * @}
+ */
+
+/**
+ * @addtogroup lavu_math
+ * @{
+ */
+
+#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
+#ifndef ff_ctz
+#define ff_ctz(v) __builtin_ctz(v)
+#endif
+#endif
+
+#ifndef ff_ctz
+#define ff_ctz ff_ctz_c
+static av_always_inline av_const int ff_ctz_c(int v)
+{
+ int c;
+
+ if (v & 0x1)
+ return 0;
+
+ c = 1;
+ if (!(v & 0xffff)) {
+ v >>= 16;
+ c += 16;
+ }
+ if (!(v & 0xff)) {
+ v >>= 8;
+ c += 8;
+ }
+ if (!(v & 0xf)) {
+ v >>= 4;
+ c += 4;
+ }
+ if (!(v & 0x3)) {
+ v >>= 2;
+ c += 2;
+ }
+ c -= v & 0x1;
+
+ return c;
+}
+#endif
+
+/**
+ * Trailing zero bit count.
+ *
+ * @param v input value. If v is 0, the result is undefined.
+ * @return the number of trailing 0-bits
+ */
+int av_ctz(int v);
+
+/**
+ * @}
+ */
+#endif /* AVUTIL_INTMATH_H */