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Ronald S. Bultje authored
For coefficients, use int16_t (instead of short); for pixel values in 16-bit intermediates, use uint16_t (instead of unsigned short); for all others, use uint8_t (instead of unsigned char). Change-Id: I3619cd9abf106c3742eccc2e2f5e89a62774f7da
4cca47b5
vp9_boolhuff.h 2.84 KiB
/* * Copyright (c) 2010 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE 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. *//****************************************************************************** Module Title : vp9_boolhuff.h** Description : Bool Coder header file.*****************************************************************************/#ifndef VP9_ENCODER_VP9_BOOLHUFF_H_#define VP9_ENCODER_VP9_BOOLHUFF_H_#include "vpx_ports/mem.h"typedef struct { unsigned int lowvalue; unsigned int range; unsigned int value; int count; unsigned int pos; unsigned char *buffer; // Variables used to track bit costs without outputing to the bitstream unsigned int measure_cost; unsigned long bit_counter;} BOOL_CODER;extern void vp9_start_encode(BOOL_CODER *bc, unsigned char *buffer);extern void vp9_encode_value(BOOL_CODER *br, int data, int bits);extern void vp9_encode_unsigned_max(BOOL_CODER *br, int data, int max);extern void vp9_stop_encode(BOOL_CODER *bc);extern const unsigned int vp9_prob_cost[256];extern void vp9_encode_uniform(BOOL_CODER *bc, int v, int n);extern void vp9_encode_term_subexp(BOOL_CODER *bc, int v, int k, int n);extern int vp9_count_uniform(int v, int n);extern int vp9_count_term_subexp(int v, int k, int n);extern int vp9_recenter_nonneg(int v, int m);DECLARE_ALIGNED(16, extern const unsigned char, vp9_norm[256]);static void encode_bool(BOOL_CODER *br, int bit, int probability) { unsigned int split; int count = br->count; unsigned int range = br->range; unsigned int lowvalue = br->lowvalue; register unsigned int shift;#ifdef ENTROPY_STATS#if defined(SECTIONBITS_OUTPUT) if (bit) Sectionbits[active_section] += vp9_prob_cost[255 - probability]; else Sectionbits[active_section] += vp9_prob_cost[probability];#endif#endif7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113
split = 1 + (((range - 1) * probability) >> 8);
range = split;
if (bit) {
lowvalue += split;
range = br->range - split;
}
shift = vp9_norm[range];
range <<= shift;
count += shift;
if (count >= 0) {
int offset = shift - count;
if ((lowvalue << (offset - 1)) & 0x80000000) {
int x = br->pos - 1;
while (x >= 0 && br->buffer[x] == 0xff) {
br->buffer[x] = (unsigned char)0;
x--;
}
br->buffer[x] += 1;
}
br->buffer[br->pos++] = (lowvalue >> (24 - offset));
lowvalue <<= offset;
shift = count;
lowvalue &= 0xffffff;
count -= 8;
}
lowvalue <<= shift;
br->count = count;
br->lowvalue = lowvalue;
br->range = range;
}
#endif // VP9_ENCODER_VP9_BOOLHUFF_H_