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210 lines
5.8 KiB
C
210 lines
5.8 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef DBOOLHUFF_H
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#define DBOOLHUFF_H
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#include <stddef.h>
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#include <limits.h>
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#include "vpx_ports/config.h"
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#include "vpx_ports/mem.h"
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#include "vpx/vpx_integer.h"
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typedef size_t VP8_BD_VALUE;
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# define VP8_BD_VALUE_SIZE ((int)sizeof(VP8_BD_VALUE)*CHAR_BIT)
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/*This is meant to be a large, positive constant that can still be efficiently
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loaded as an immediate (on platforms like ARM, for example).
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Even relatively modest values like 100 would work fine.*/
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# define VP8_LOTS_OF_BITS (0x40000000)
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struct vp8_dboolhuff_rtcd_vtable;
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typedef struct
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{
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const unsigned char *user_buffer_end;
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const unsigned char *user_buffer;
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VP8_BD_VALUE value;
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int count;
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unsigned int range;
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#if CONFIG_RUNTIME_CPU_DETECT
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struct vp8_dboolhuff_rtcd_vtable *rtcd;
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#endif
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} BOOL_DECODER;
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#define prototype_dbool_start(sym) int sym(BOOL_DECODER *br, \
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const unsigned char *source, unsigned int source_sz)
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#define prototype_dbool_fill(sym) void sym(BOOL_DECODER *br)
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#define prototype_dbool_debool(sym) int sym(BOOL_DECODER *br, int probability)
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#define prototype_dbool_devalue(sym) int sym(BOOL_DECODER *br, int bits)
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#if ARCH_ARM
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#include "arm/dboolhuff_arm.h"
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#endif
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#ifndef vp8_dbool_start
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#define vp8_dbool_start vp8dx_start_decode_c
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#endif
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#ifndef vp8_dbool_fill
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#define vp8_dbool_fill vp8dx_bool_decoder_fill_c
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#endif
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#ifndef vp8_dbool_debool
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#define vp8_dbool_debool vp8dx_decode_bool_c
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#endif
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#ifndef vp8_dbool_devalue
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#define vp8_dbool_devalue vp8dx_decode_value_c
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#endif
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extern prototype_dbool_start(vp8_dbool_start);
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extern prototype_dbool_fill(vp8_dbool_fill);
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extern prototype_dbool_debool(vp8_dbool_debool);
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extern prototype_dbool_devalue(vp8_dbool_devalue);
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typedef prototype_dbool_start((*vp8_dbool_start_fn_t));
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typedef prototype_dbool_fill((*vp8_dbool_fill_fn_t));
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typedef prototype_dbool_debool((*vp8_dbool_debool_fn_t));
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typedef prototype_dbool_devalue((*vp8_dbool_devalue_fn_t));
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typedef struct vp8_dboolhuff_rtcd_vtable {
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vp8_dbool_start_fn_t start;
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vp8_dbool_fill_fn_t fill;
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vp8_dbool_debool_fn_t debool;
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vp8_dbool_devalue_fn_t devalue;
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} vp8_dboolhuff_rtcd_vtable_t;
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/* There are no processor-specific versions of these
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* functions right now. Disable RTCD to avoid using
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* function pointers which gives a speed boost
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*/
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/*#ifdef ENABLE_RUNTIME_CPU_DETECT
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#define DBOOLHUFF_INVOKE(ctx,fn) (ctx)->fn
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#define IF_RTCD(x) (x)
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#else*/
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#define DBOOLHUFF_INVOKE(ctx,fn) vp8_dbool_##fn
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#define IF_RTCD(x) NULL
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/*#endif*/
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DECLARE_ALIGNED(16, extern const unsigned char, vp8dx_bitreader_norm[256]);
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/* wrapper functions to hide RTCD. static means inline means hopefully no
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* penalty
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*/
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static int vp8dx_start_decode(BOOL_DECODER *br,
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struct vp8_dboolhuff_rtcd_vtable *rtcd,
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const unsigned char *source, unsigned int source_sz) {
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#if CONFIG_RUNTIME_CPU_DETECT
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br->rtcd = rtcd;
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#endif
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return DBOOLHUFF_INVOKE(rtcd, start)(br, source, source_sz);
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}
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static void vp8dx_bool_decoder_fill(BOOL_DECODER *br) {
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DBOOLHUFF_INVOKE(br->rtcd, fill)(br);
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}
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/*The refill loop is used in several places, so define it in a macro to make
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sure they're all consistent.
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An inline function would be cleaner, but has a significant penalty, because
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multiple BOOL_DECODER fields must be modified, and the compiler is not smart
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enough to eliminate the stores to those fields and the subsequent reloads
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from them when inlining the function.*/
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#define VP8DX_BOOL_DECODER_FILL(_count,_value,_bufptr,_bufend) \
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do \
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{ \
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int shift; \
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for(shift = VP8_BD_VALUE_SIZE - 8 - ((_count) + 8); shift >= 0; ) \
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{ \
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if((_bufptr) >= (_bufend)) { \
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(_count) = VP8_LOTS_OF_BITS; \
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break; \
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} \
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(_count) += 8; \
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(_value) |= (VP8_BD_VALUE)*(_bufptr)++ << shift; \
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shift -= 8; \
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} \
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} \
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while(0)
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static int vp8dx_decode_bool(BOOL_DECODER *br, int probability) {
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/*
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* Until optimized versions of this function are available, we
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* keep the implementation in the header to allow inlining.
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*
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*return DBOOLHUFF_INVOKE(br->rtcd, debool)(br, probability);
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*/
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unsigned int bit = 0;
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VP8_BD_VALUE value;
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unsigned int split;
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VP8_BD_VALUE bigsplit;
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int count;
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unsigned int range;
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value = br->value;
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count = br->count;
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range = br->range;
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split = 1 + (((range - 1) * probability) >> 8);
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bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8);
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range = split;
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if (value >= bigsplit)
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{
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range = br->range - split;
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value = value - bigsplit;
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bit = 1;
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}
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/*if(range>=0x80)
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{
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br->value = value;
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br->range = range;
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return bit
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}*/
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{
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register unsigned int shift = vp8dx_bitreader_norm[range];
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range <<= shift;
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value <<= shift;
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count -= shift;
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}
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br->value = value;
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br->count = count;
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br->range = range;
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if(count < 0)
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vp8dx_bool_decoder_fill(br);
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return bit;
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}
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static int vp8_decode_value(BOOL_DECODER *br, int bits)
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{
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/*
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* Until optimized versions of this function are available, we
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* keep the implementation in the header to allow inlining.
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*
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*return DBOOLHUFF_INVOKE(br->rtcd, devalue)(br, bits);
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*/
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int z = 0;
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int bit;
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for (bit = bits - 1; bit >= 0; bit--)
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{
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z |= (vp8dx_decode_bool(br, 0x80) << bit);
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}
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return z;
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}
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#endif
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