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extract random utils to their own file util/random.[ch]

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they'll be used for decoding too, probably.

Change-Id: Id9cbb250c74fc0e876d4ea46b1b3dbf8356d6725
This commit is contained in:
Pascal Massimino
2013-10-30 02:00:33 -07:00
parent d3408720d8
commit 98aa33cf1e
7 changed files with 118 additions and 51 deletions
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src/utils/random.h Normal file
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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Pseudo-random utilities
//
// Author: Skal (pascal.massimino@gmail.com)
#ifndef WEBP_UTILS_RANDOM_H_
#define WEBP_UTILS_RANDOM_H_
#include <assert.h>
#include "../webp/types.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#define VP8_RANDOM_DITHER_FIX 8 // fixed-point precision for dithering
#define VP8_RANDOM_TABLE_SIZE 55
typedef struct {
int index1_, index2_;
uint32_t tab_[VP8_RANDOM_TABLE_SIZE];
int amp_;
} VP8Random;
// Initializes random generator with an amplitude 'dithering' in range [0..1].
extern void VP8InitRandom(VP8Random* const rg, float dithering);
// Returns a centered pseudo-random number with 'num_bits' amplitude.
// (uses D.Knuth's Difference-based random generator)
static WEBP_INLINE int VP8RandomBits(VP8Random* const rg, int num_bits) {
int diff;
assert(num_bits + VP8_RANDOM_DITHER_FIX <= 31);
diff = rg->tab_[rg->index1_] - rg->tab_[rg->index2_];
if (diff < 0) diff += (1u << 31);
rg->tab_[rg->index1_] = diff;
if (++rg->index1_ == VP8_RANDOM_TABLE_SIZE) rg->index1_ = 0;
if (++rg->index2_ == VP8_RANDOM_TABLE_SIZE) rg->index2_ = 0;
diff = (diff << 1) >> (32 - num_bits); // sign-extend, 0-center
diff = (diff * rg->amp_) >> VP8_RANDOM_DITHER_FIX; // restrict range
diff += 1 << (num_bits - 1); // shift back to 0.5-center
return diff;
}
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
#endif /* WEBP_UTILS_RANDOM_H_ */