0da71265 |
/*
* exp golomb vlc stuff
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
4579adb0 |
* Copyright (c) 2004 Alex Beregszaszi |
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* |
b78e7197 |
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
0da71265 |
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
b78e7197 |
* version 2.1 of the License, or (at your option) any later version. |
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* |
b78e7197 |
* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
b78e7197 |
* License along with FFmpeg; if not, write to the Free Software |
5509bffa |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
0da71265 |
/** |
ba87f080 |
* @file |
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* @brief |
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* exp golomb vlc stuff |
4579adb0 |
* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi |
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*/
|
98790382 |
#ifndef AVCODEC_GOLOMB_H
#define AVCODEC_GOLOMB_H |
699b3f99 |
|
99545457 |
#include <stdint.h> |
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|
9106a698 |
#include "get_bits.h" |
b2755007 |
#include "put_bits.h" |
99545457 |
|
8b82a956 |
#define INVALID_VLC 0x80000000
|
0da71265 |
extern const uint8_t ff_golomb_vlc_len[512];
extern const uint8_t ff_ue_golomb_vlc_code[512];
extern const int8_t ff_se_golomb_vlc_code[512];
extern const uint8_t ff_ue_golomb_len[256];
|
4704097a |
extern const uint8_t ff_interleaved_golomb_vlc_len[256];
extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
extern const int8_t ff_interleaved_se_golomb_vlc_code[256]; |
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extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; |
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|
2c993e8b |
/** |
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* Read an unsigned Exp-Golomb code in the range 0 to 8190. |
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*/ |
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static inline int get_ue_golomb(GetBitContext *gb)
{ |
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unsigned int buf; |
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|
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OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
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buf = GET_CACHE(re, gb); |
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|
2c993e8b |
if (buf >= (1 << 27)) { |
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buf >>= 32 - 9;
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
CLOSE_READER(re, gb); |
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|
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return ff_ue_golomb_vlc_code[buf]; |
2c993e8b |
} else { |
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int log = 2 * av_log2(buf) - 31; |
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LAST_SKIP_BITS(re, gb, 32 - log);
CLOSE_READER(re, gb); |
22e960ad |
if (log < 7) { |
b0ae362a |
av_log(NULL, AV_LOG_ERROR, "Invalid UE golomb code\n"); |
fd165ace |
return AVERROR_INVALIDDATA;
} |
02a31f6a |
buf >>= log; |
fd165ace |
buf--; |
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|
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return buf;
}
}
|
fdba370f |
/**
* Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
*/
static inline unsigned get_ue_golomb_long(GetBitContext *gb)
{
unsigned buf, log;
buf = show_bits_long(gb, 32);
log = 31 - av_log2(buf);
skip_bits_long(gb, log);
return get_bits_long(gb, log + 1) - 1;
}
|
2c993e8b |
/** |
9392863d |
* read unsigned exp golomb code, constraint to a max of 31.
* the return value is undefined if the stored value exceeds 31. |
0e921e97 |
*/ |
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static inline int get_ue_golomb_31(GetBitContext *gb)
{ |
0e921e97 |
unsigned int buf;
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
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buf = GET_CACHE(re, gb); |
0e921e97 |
buf >>= 32 - 9;
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
CLOSE_READER(re, gb);
return ff_ue_golomb_vlc_code[buf];
}
|
4024b566 |
static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb) |
9a2e7911 |
{ |
4704097a |
uint32_t buf; |
8b82a956 |
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
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buf = GET_CACHE(re, gb); |
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|
2c993e8b |
if (buf & 0xAA800000) { |
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buf >>= 32 - 8;
LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
CLOSE_READER(re, gb); |
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|
4704097a |
return ff_interleaved_ue_golomb_vlc_code[buf]; |
2c993e8b |
} else { |
9a2e7911 |
unsigned ret = 1; |
9df4ce5e |
|
964506bb |
do { |
9df4ce5e |
buf >>= 32 - 8; |
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LAST_SKIP_BITS(re, gb,
FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); |
9df4ce5e |
|
2c993e8b |
if (ff_interleaved_golomb_vlc_len[buf] != 9) { |
9df4ce5e |
ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; |
2c993e8b |
ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; |
9df4ce5e |
break;
}
ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
UPDATE_CACHE(re, gb);
buf = GET_CACHE(re, gb); |
9e59a7be |
} while (ret<0x8000000U && BITS_AVAILABLE(re, gb)); |
8b82a956 |
|
4704097a |
CLOSE_READER(re, gb); |
9df4ce5e |
return ret - 1; |
4704097a |
} |
8b82a956 |
}
|
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/**
* read unsigned truncated exp golomb code.
*/ |
2c993e8b |
static inline int get_te0_golomb(GetBitContext *gb, int range)
{ |
28e4f906 |
av_assert2(range >= 1); |
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|
2c993e8b |
if (range == 1)
return 0;
else if (range == 2)
return get_bits1(gb) ^ 1;
else
return get_ue_golomb(gb); |
0da71265 |
}
/**
* read unsigned truncated exp golomb code.
*/ |
2c993e8b |
static inline int get_te_golomb(GetBitContext *gb, int range)
{ |
28e4f906 |
av_assert2(range >= 1); |
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|
2c993e8b |
if (range == 2)
return get_bits1(gb) ^ 1;
else
return get_ue_golomb(gb); |
0da71265 |
}
/**
* read signed exp golomb code.
*/ |
2c993e8b |
static inline int get_se_golomb(GetBitContext *gb)
{ |
0da71265 |
unsigned int buf; |
115329f1 |
|
0da71265 |
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
2c993e8b |
buf = GET_CACHE(re, gb); |
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|
2c993e8b |
if (buf >= (1 << 27)) { |
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buf >>= 32 - 9;
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
CLOSE_READER(re, gb); |
115329f1 |
|
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return ff_se_golomb_vlc_code[buf]; |
2c993e8b |
} else { |
b11a1875 |
int log = av_log2(buf), sign; |
a92816c4 |
LAST_SKIP_BITS(re, gb, 31 - log);
UPDATE_CACHE(re, gb);
buf = GET_CACHE(re, gb);
|
2c993e8b |
buf >>= log; |
115329f1 |
|
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LAST_SKIP_BITS(re, gb, 32 - log);
CLOSE_READER(re, gb); |
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|
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sign = -(buf & 1);
buf = ((buf >> 1) ^ sign) - sign; |
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return buf;
}
}
|
5eacbb53 |
static inline int get_se_golomb_long(GetBitContext *gb)
{
unsigned int buf = get_ue_golomb_long(gb); |
02fc168c |
int sign = (buf & 1) - 1; |
b11a1875 |
return ((buf >> 1) ^ sign) + 1; |
5eacbb53 |
}
|
4024b566 |
static inline int get_interleaved_se_golomb(GetBitContext *gb) |
2c993e8b |
{ |
8b82a956 |
unsigned int buf;
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
2c993e8b |
buf = GET_CACHE(re, gb); |
8b82a956 |
|
2c993e8b |
if (buf & 0xAA800000) { |
4704097a |
buf >>= 32 - 8;
LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
CLOSE_READER(re, gb); |
115329f1 |
|
4704097a |
return ff_interleaved_se_golomb_vlc_code[buf]; |
2c993e8b |
} else { |
fb13fe83 |
int log; |
895345da |
LAST_SKIP_BITS(re, gb, 8);
UPDATE_CACHE(re, gb);
buf |= 1 | (GET_CACHE(re, gb) >> 8);
|
2c993e8b |
if ((buf & 0xAAAAAAAA) == 0) |
4704097a |
return INVALID_VLC; |
8b82a956 |
|
2c993e8b |
for (log = 31; (buf & 0x80000000) == 0; log--) |
4704097a |
buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); |
8b82a956 |
|
2c993e8b |
LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8); |
4704097a |
CLOSE_READER(re, gb); |
8b82a956 |
|
4704097a |
return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
} |
8b82a956 |
}
|
2c993e8b |
static inline int dirac_get_se_golomb(GetBitContext *gb)
{ |
4024b566 |
uint32_t ret = get_interleaved_ue_golomb(gb); |
9df4ce5e |
if (ret) { |
02fc168c |
int sign = -get_bits1(gb); |
b11a1875 |
ret = (ret ^ sign) - sign; |
9df4ce5e |
}
return ret;
}
|
11e659c2 |
/** |
d9e6a6c6 |
* read unsigned golomb rice code (ffv1). |
11e659c2 |
*/ |
2c993e8b |
static inline int get_ur_golomb(GetBitContext *gb, int k, int limit,
int esc_len)
{ |
11e659c2 |
unsigned int buf;
int log; |
115329f1 |
|
11e659c2 |
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
2c993e8b |
buf = GET_CACHE(re, gb); |
11e659c2 |
|
2c993e8b |
log = av_log2(buf); |
d9e6a6c6 |
|
2c993e8b |
if (log > 31 - limit) { |
11e659c2 |
buf >>= log - k; |
8617bc6f |
buf += (30U - log) << k; |
11e659c2 |
LAST_SKIP_BITS(re, gb, 32 + k - log);
CLOSE_READER(re, gb); |
115329f1 |
|
11e659c2 |
return buf; |
2c993e8b |
} else { |
6fa6c481 |
LAST_SKIP_BITS(re, gb, limit);
UPDATE_CACHE(re, gb);
buf = SHOW_UBITS(re, gb, esc_len);
LAST_SKIP_BITS(re, gb, esc_len); |
11e659c2 |
CLOSE_READER(re, gb); |
115329f1 |
|
d9e6a6c6 |
return buf + limit - 1;
}
}
/**
* read unsigned golomb rice code (jpegls).
*/ |
2c993e8b |
static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,
int esc_len)
{ |
d9e6a6c6 |
unsigned int buf;
int log; |
115329f1 |
|
d9e6a6c6 |
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb); |
2c993e8b |
buf = GET_CACHE(re, gb); |
d9e6a6c6 |
|
2c993e8b |
log = av_log2(buf); |
115329f1 |
|
0884b1c5 |
av_assert2(k <= 31);
|
2c993e8b |
if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
32 - log < limit) { |
d9e6a6c6 |
buf >>= log - k; |
8617bc6f |
buf += (30U - log) << k; |
d9e6a6c6 |
LAST_SKIP_BITS(re, gb, 32 + k - log);
CLOSE_READER(re, gb); |
115329f1 |
|
d9e6a6c6 |
return buf; |
2c993e8b |
} else { |
d9e6a6c6 |
int i; |
52e4018b |
for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { |
3ab1311a |
if (gb->size_in_bits <= re_index) {
CLOSE_READER(re, gb); |
083d9ba4 |
return -1; |
3ab1311a |
} |
d9e6a6c6 |
LAST_SKIP_BITS(re, gb, 1);
UPDATE_CACHE(re, gb);
}
SKIP_BITS(re, gb, 1);
|
2c993e8b |
if (i < limit - 1) {
if (k) { |
c720b9ce |
if (k > MIN_CACHE_BITS - 1) {
buf = SHOW_UBITS(re, gb, 16) << (k-16);
LAST_SKIP_BITS(re, gb, 16);
UPDATE_CACHE(re, gb);
buf |= SHOW_UBITS(re, gb, k-16);
LAST_SKIP_BITS(re, gb, k-16);
} else {
buf = SHOW_UBITS(re, gb, k);
LAST_SKIP_BITS(re, gb, k);
} |
2c993e8b |
} else {
buf = 0; |
d9e6a6c6 |
}
|
2752410c |
buf += ((SUINT)i << k); |
2c993e8b |
} else if (i == limit - 1) { |
d9e6a6c6 |
buf = SHOW_UBITS(re, gb, esc_len);
LAST_SKIP_BITS(re, gb, esc_len); |
115329f1 |
|
3ab1311a |
buf ++;
} else {
buf = -1;
}
CLOSE_READER(re, gb);
return buf; |
d9e6a6c6 |
} |
11e659c2 |
}
|
ac2570a8 |
/** |
4579adb0 |
* read signed golomb rice code (ffv1).
*/ |
2c993e8b |
static inline int get_sr_golomb(GetBitContext *gb, int k, int limit,
int esc_len)
{ |
14c4b251 |
unsigned v = get_ur_golomb(gb, k, limit, esc_len); |
02fc168c |
return (v >> 1) ^ -(v & 1); |
4579adb0 |
}
|
a6c01275 |
/** |
4579adb0 |
* read signed golomb rice code (flac). |
ac2570a8 |
*/ |
2c993e8b |
static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit,
int esc_len)
{ |
14c4b251 |
unsigned v = get_ur_golomb_jpegls(gb, k, limit, esc_len); |
2c993e8b |
return (v >> 1) ^ -(v & 1); |
ac2570a8 |
}
|
85ad5695 |
/**
* read unsigned golomb rice code (shorten).
*/ |
2c993e8b |
static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
{
return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); |
85ad5695 |
}
/**
* read signed golomb rice code (shorten).
*/ |
2c993e8b |
static inline int get_sr_golomb_shorten(GetBitContext *gb, int k) |
85ad5695 |
{
int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); |
b11a1875 |
return (uvar >> 1) ^ -(uvar & 1); |
85ad5695 |
}
|
0da71265 |
#ifdef TRACE
|
80412997 |
static inline int get_ue(GetBitContext *s, const char *file, const char *func,
int line)
{ |
2c993e8b |
int show = show_bits(s, 24);
int pos = get_bits_count(s);
int i = get_ue_golomb(s);
int len = get_bits_count(s) - pos;
int bits = show >> (24 - len); |
115329f1 |
|
2c993e8b |
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n",
bits, len, i, pos, file, func, line); |
115329f1 |
|
0da71265 |
return i;
}
|
80412997 |
static inline int get_se(GetBitContext *s, const char *file, const char *func,
int line)
{ |
2c993e8b |
int show = show_bits(s, 24);
int pos = get_bits_count(s);
int i = get_se_golomb(s);
int len = get_bits_count(s) - pos;
int bits = show >> (24 - len); |
115329f1 |
|
2c993e8b |
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n",
bits, len, i, pos, file, func, line); |
115329f1 |
|
0da71265 |
return i;
}
|
2c993e8b |
static inline int get_te(GetBitContext *s, int r, char *file, const char *func,
int line)
{
int show = show_bits(s, 24);
int pos = get_bits_count(s);
int i = get_te0_golomb(s, r);
int len = get_bits_count(s) - pos;
int bits = show >> (24 - len); |
115329f1 |
|
2c993e8b |
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n",
bits, len, i, pos, file, func, line); |
115329f1 |
|
0da71265 |
return i;
}
|
f7407f56 |
#define get_ue_golomb(a) get_ue(a, __FILE__, __func__, __LINE__)
#define get_se_golomb(a) get_se(a, __FILE__, __func__, __LINE__)
#define get_te_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__)
#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) |
0da71265 |
|
2c993e8b |
#endif /* TRACE */ |
0da71265 |
/** |
ea1d07ae |
* write unsigned exp golomb code. 2^16 - 2 at most |
0da71265 |
*/ |
2c993e8b |
static inline void set_ue_golomb(PutBitContext *pb, int i)
{ |
02a31f6a |
av_assert2(i >= 0); |
db93fd74 |
av_assert2(i <= 0xFFFE); |
0da71265 |
|
2c993e8b |
if (i < 256)
put_bits(pb, ff_ue_golomb_len[i], i + 1);
else { |
fb13fe83 |
int e = av_log2(i + 1); |
2c993e8b |
put_bits(pb, 2 * e + 1, i + 1); |
0da71265 |
}
}
/** |
e61abe2d |
* write unsigned exp golomb code. 2^32-2 at most.
*/
static inline void set_ue_golomb_long(PutBitContext *pb, uint32_t i)
{
av_assert2(i <= (UINT32_MAX - 1));
if (i < 256)
put_bits(pb, ff_ue_golomb_len[i], i + 1);
else {
int e = av_log2(i + 1);
put_bits64(pb, 2 * e + 1, i + 1);
}
}
/** |
0da71265 |
* write truncated unsigned exp golomb code.
*/ |
2c993e8b |
static inline void set_te_golomb(PutBitContext *pb, int i, int range)
{ |
28e4f906 |
av_assert2(range >= 1); |
02a31f6a |
av_assert2(i <= range); |
0da71265 |
|
2c993e8b |
if (range == 2)
put_bits(pb, 1, i ^ 1);
else
set_ue_golomb(pb, i); |
0da71265 |
}
/** |
e134e10f |
* write signed exp golomb code. 16 bits at most. |
0da71265 |
*/ |
2c993e8b |
static inline void set_se_golomb(PutBitContext *pb, int i)
{
i = 2 * i - 1;
if (i < 0)
i ^= -1; //FIXME check if gcc does the right thing |
0da71265 |
set_ue_golomb(pb, i);
} |
11e659c2 |
/** |
d9e6a6c6 |
* write unsigned golomb rice code (ffv1). |
11e659c2 |
*/ |
2c993e8b |
static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit,
int esc_len)
{ |
11e659c2 |
int e; |
115329f1 |
|
02a31f6a |
av_assert2(i >= 0); |
115329f1 |
|
2c993e8b |
e = i >> k;
if (e < limit) |
ba625dd8 |
put_bits(pb, e + k + 1, (1 << k) + av_mod_uintp2(i, k)); |
2c993e8b |
else |
d9e6a6c6 |
put_bits(pb, limit + esc_len, i - limit + 1);
}
/**
* write unsigned golomb rice code (jpegls).
*/ |
2c993e8b |
static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k,
int limit, int esc_len)
{ |
d9e6a6c6 |
int e; |
115329f1 |
|
02a31f6a |
av_assert2(i >= 0); |
115329f1 |
|
2c993e8b |
e = (i >> k) + 1;
if (e < limit) {
while (e > 31) { |
9e96ab03 |
put_bits(pb, 31, 0);
e -= 31;
} |
d9e6a6c6 |
put_bits(pb, e, 1); |
2c993e8b |
if (k) |
6647ab80 |
put_sbits(pb, k, i); |
2c993e8b |
} else {
while (limit > 31) { |
76aca7a8 |
put_bits(pb, 31, 0);
limit -= 31;
} |
2c993e8b |
put_bits(pb, limit, 1); |
d9e6a6c6 |
put_bits(pb, esc_len, i - 1); |
11e659c2 |
}
} |
4579adb0 |
/**
* write signed golomb rice code (ffv1).
*/ |
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static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit,
int esc_len)
{ |
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int v;
|
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v = -2 * i - 1;
v ^= (v >> 31); |
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set_ur_golomb(pb, v, k, limit, esc_len);
}
/**
* write signed golomb rice code (flac).
*/ |
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static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k,
int limit, int esc_len)
{ |
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int v;
|
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v = -2 * i - 1;
v ^= (v >> 31); |
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set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
} |
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|
98790382 |
#endif /* AVCODEC_GOLOMB_H */ |