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/**************************************************************************
*
* Copyright 2011 Christian König.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef vl_vlc_h
#define vl_vlc_h
#include <assert.h>
#include "pipe/p_compiler.h"
#include "util/u_math.h"
#include "util/u_pointer.h"
struct vl_vlc
{
uint64_t buffer;
unsigned valid_bits;
uint32_t *data;
uint32_t *end;
};
struct vl_vlc_entry
{
int8_t length;
int8_t value;
};
struct vl_vlc_compressed
{
uint16_t bitcode;
struct vl_vlc_entry entry;
};
static INLINE void
vl_vlc_init_table(struct vl_vlc_entry *dst, unsigned dst_size, const struct vl_vlc_compressed *src, unsigned src_size)
{
unsigned i, bits = util_logbase2(dst_size);
for (i=0;i<dst_size;++i) {
dst[i].length = 0;
dst[i].value = 0;
}
for(; src_size > 0; --src_size, ++src) {
for(i=0; i<(1 << (bits - src->entry.length)); ++i)
dst[src->bitcode >> (16 - bits) | i] = src->entry;
}
}
static INLINE void
vl_vlc_fillbits(struct vl_vlc *vlc)
{
if (vlc->valid_bits < 32) {
uint32_t value = *vlc->data;
//assert(vlc->data <= vlc->end);
#ifndef PIPE_ARCH_BIG_ENDIAN
value = util_bswap32(value);
#endif
vlc->buffer |= (uint64_t)value << (32 - vlc->valid_bits);
++vlc->data;
vlc->valid_bits += 32;
}
}
static INLINE void
vl_vlc_init(struct vl_vlc *vlc, const uint8_t *data, unsigned len)
{
assert(vlc);
assert(data && len);
vlc->buffer = 0;
vlc->valid_bits = 0;
/* align the data pointer */
while (pointer_to_uintptr(data) & 3) {
vlc->buffer |= (uint64_t)*data << (56 - vlc->valid_bits);
++data;
--len;
vlc->valid_bits += 8;
}
vlc->data = (uint32_t*)data;
vlc->end = (uint32_t*)(data + len);
vl_vlc_fillbits(vlc);
vl_vlc_fillbits(vlc);
}
static INLINE unsigned
vl_vlc_bits_left(struct vl_vlc *vlc)
{
signed bytes_left = ((uint8_t*)vlc->end)-((uint8_t*)vlc->data);
return bytes_left * 8 + vlc->valid_bits;
}
static INLINE unsigned
vl_vlc_peekbits(struct vl_vlc *vlc, unsigned num_bits)
{
//assert(vlc->valid_bits >= num_bits);
return vlc->buffer >> (64 - num_bits);
}
static INLINE void
vl_vlc_eatbits(struct vl_vlc *vlc, unsigned num_bits)
{
//assert(vlc->valid_bits > num_bits);
vlc->buffer <<= num_bits;
vlc->valid_bits -= num_bits;
}
static INLINE unsigned
vl_vlc_get_uimsbf(struct vl_vlc *vlc, unsigned num_bits)
{
unsigned value;
//assert(vlc->valid_bits >= num_bits);
value = vlc->buffer >> (64 - num_bits);
vl_vlc_eatbits(vlc, num_bits);
return value;
}
static INLINE signed
vl_vlc_get_simsbf(struct vl_vlc *vlc, unsigned num_bits)
{
signed value;
//assert(vlc->valid_bits >= num_bits);
value = ((int64_t)vlc->buffer) >> (64 - num_bits);
vl_vlc_eatbits(vlc, num_bits);
return value;
}
static INLINE int8_t
vl_vlc_get_vlclbf(struct vl_vlc *vlc, const struct vl_vlc_entry *tbl, unsigned num_bits)
{
tbl += vl_vlc_peekbits(vlc, num_bits);
vl_vlc_eatbits(vlc, tbl->length);
return tbl->value;
}
#endif /* vl_vlc_h */
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