0,0 → 1,593 |
/* |
* exp golomb vlc stuff |
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
* Copyright (c) 2004 Alex Beregszaszi |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* 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 |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* @brief |
* exp golomb vlc stuff |
* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi |
*/ |
|
#ifndef AVCODEC_GOLOMB_H |
#define AVCODEC_GOLOMB_H |
|
#include <stdint.h> |
|
#include "get_bits.h" |
#include "put_bits.h" |
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#define INVALID_VLC 0x80000000 |
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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]; |
|
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]; |
extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; |
|
/** |
* read unsigned exp golomb code. |
*/ |
static inline int get_ue_golomb(GetBitContext *gb) |
{ |
unsigned int buf; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
if (buf >= (1 << 27)) { |
buf >>= 32 - 9; |
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); |
CLOSE_READER(re, gb); |
|
return ff_ue_golomb_vlc_code[buf]; |
} else { |
int log = 2 * av_log2(buf) - 31; |
LAST_SKIP_BITS(re, gb, 32 - log); |
CLOSE_READER(re, gb); |
if (CONFIG_FTRAPV && log < 0) { |
av_log(0, AV_LOG_ERROR, "Invalid UE golomb code\n"); |
return AVERROR_INVALIDDATA; |
} |
buf >>= log; |
buf--; |
|
return buf; |
} |
} |
|
/** |
* 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; |
} |
|
/** |
* read unsigned exp golomb code, constraint to a max of 31. |
* the return value is undefined if the stored value exceeds 31. |
*/ |
static inline int get_ue_golomb_31(GetBitContext *gb) |
{ |
unsigned int buf; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
buf >>= 32 - 9; |
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); |
CLOSE_READER(re, gb); |
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return ff_ue_golomb_vlc_code[buf]; |
} |
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static inline unsigned svq3_get_ue_golomb(GetBitContext *gb) |
{ |
uint32_t buf; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
if (buf & 0xAA800000) { |
buf >>= 32 - 8; |
LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); |
CLOSE_READER(re, gb); |
|
return ff_interleaved_ue_golomb_vlc_code[buf]; |
} else { |
unsigned ret = 1; |
|
do { |
buf >>= 32 - 8; |
LAST_SKIP_BITS(re, gb, |
FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); |
|
if (ff_interleaved_golomb_vlc_len[buf] != 9) { |
ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; |
ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; |
break; |
} |
ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf]; |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
} while (ret<0x8000000U && HAVE_BITS_REMAINING(re, gb)); |
|
CLOSE_READER(re, gb); |
return ret - 1; |
} |
} |
|
/** |
* read unsigned truncated exp golomb code. |
*/ |
static inline int get_te0_golomb(GetBitContext *gb, int range) |
{ |
av_assert2(range >= 1); |
|
if (range == 1) |
return 0; |
else if (range == 2) |
return get_bits1(gb) ^ 1; |
else |
return get_ue_golomb(gb); |
} |
|
/** |
* read unsigned truncated exp golomb code. |
*/ |
static inline int get_te_golomb(GetBitContext *gb, int range) |
{ |
av_assert2(range >= 1); |
|
if (range == 2) |
return get_bits1(gb) ^ 1; |
else |
return get_ue_golomb(gb); |
} |
|
/** |
* read signed exp golomb code. |
*/ |
static inline int get_se_golomb(GetBitContext *gb) |
{ |
unsigned int buf; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
if (buf >= (1 << 27)) { |
buf >>= 32 - 9; |
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); |
CLOSE_READER(re, gb); |
|
return ff_se_golomb_vlc_code[buf]; |
} else { |
int log = av_log2(buf); |
LAST_SKIP_BITS(re, gb, 31 - log); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
buf >>= log; |
|
LAST_SKIP_BITS(re, gb, 32 - log); |
CLOSE_READER(re, gb); |
|
if (buf & 1) |
buf = -(buf >> 1); |
else |
buf = (buf >> 1); |
|
return buf; |
} |
} |
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static inline int svq3_get_se_golomb(GetBitContext *gb) |
{ |
unsigned int buf; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
if (buf & 0xAA800000) { |
buf >>= 32 - 8; |
LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); |
CLOSE_READER(re, gb); |
|
return ff_interleaved_se_golomb_vlc_code[buf]; |
} else { |
int log; |
LAST_SKIP_BITS(re, gb, 8); |
UPDATE_CACHE(re, gb); |
buf |= 1 | (GET_CACHE(re, gb) >> 8); |
|
if ((buf & 0xAAAAAAAA) == 0) |
return INVALID_VLC; |
|
for (log = 31; (buf & 0x80000000) == 0; log--) |
buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); |
|
LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8); |
CLOSE_READER(re, gb); |
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return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; |
} |
} |
|
static inline int dirac_get_se_golomb(GetBitContext *gb) |
{ |
uint32_t ret = svq3_get_ue_golomb(gb); |
|
if (ret) { |
uint32_t buf; |
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = SHOW_SBITS(re, gb, 1); |
LAST_SKIP_BITS(re, gb, 1); |
ret = (ret ^ buf) - buf; |
CLOSE_READER(re, gb); |
} |
|
return ret; |
} |
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/** |
* read unsigned golomb rice code (ffv1). |
*/ |
static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, |
int esc_len) |
{ |
unsigned int buf; |
int log; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
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log = av_log2(buf); |
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if (log > 31 - limit) { |
buf >>= log - k; |
buf += (30 - log) << k; |
LAST_SKIP_BITS(re, gb, 32 + k - log); |
CLOSE_READER(re, gb); |
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return buf; |
} else { |
LAST_SKIP_BITS(re, gb, limit); |
UPDATE_CACHE(re, gb); |
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buf = SHOW_UBITS(re, gb, esc_len); |
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LAST_SKIP_BITS(re, gb, esc_len); |
CLOSE_READER(re, gb); |
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return buf + limit - 1; |
} |
} |
|
/** |
* read unsigned golomb rice code (jpegls). |
*/ |
static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, |
int esc_len) |
{ |
unsigned int buf; |
int log; |
|
OPEN_READER(re, gb); |
UPDATE_CACHE(re, gb); |
buf = GET_CACHE(re, gb); |
|
log = av_log2(buf); |
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if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) && |
32 - log < limit) { |
buf >>= log - k; |
buf += (30 - log) << k; |
LAST_SKIP_BITS(re, gb, 32 + k - log); |
CLOSE_READER(re, gb); |
|
return buf; |
} else { |
int i; |
for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { |
if (gb->size_in_bits <= re_index) |
return -1; |
LAST_SKIP_BITS(re, gb, 1); |
UPDATE_CACHE(re, gb); |
} |
SKIP_BITS(re, gb, 1); |
|
if (i < limit - 1) { |
if (k) { |
buf = SHOW_UBITS(re, gb, k); |
LAST_SKIP_BITS(re, gb, k); |
} else { |
buf = 0; |
} |
|
CLOSE_READER(re, gb); |
return buf + (i << k); |
} else if (i == limit - 1) { |
buf = SHOW_UBITS(re, gb, esc_len); |
LAST_SKIP_BITS(re, gb, esc_len); |
CLOSE_READER(re, gb); |
|
return buf + 1; |
} else |
return -1; |
} |
} |
|
/** |
* read signed golomb rice code (ffv1). |
*/ |
static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, |
int esc_len) |
{ |
int v = get_ur_golomb(gb, k, limit, esc_len); |
|
v++; |
if (v & 1) |
return v >> 1; |
else |
return -(v >> 1); |
|
// return (v>>1) ^ -(v&1); |
} |
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/** |
* read signed golomb rice code (flac). |
*/ |
static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, |
int esc_len) |
{ |
int v = get_ur_golomb_jpegls(gb, k, limit, esc_len); |
return (v >> 1) ^ -(v & 1); |
} |
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/** |
* read unsigned golomb rice code (shorten). |
*/ |
static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k) |
{ |
return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); |
} |
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/** |
* read signed golomb rice code (shorten). |
*/ |
static inline int get_sr_golomb_shorten(GetBitContext *gb, int k) |
{ |
int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); |
if (uvar & 1) |
return ~(uvar >> 1); |
else |
return uvar >> 1; |
} |
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#ifdef TRACE |
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static inline int get_ue(GetBitContext *s, const char *file, const char *func, |
int line) |
{ |
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); |
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print_bin(bits, len); |
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", |
bits, len, i, pos, file, func, line); |
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return i; |
} |
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static inline int get_se(GetBitContext *s, const char *file, const char *func, |
int line) |
{ |
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); |
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print_bin(bits, len); |
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", |
bits, len, i, pos, file, func, line); |
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return i; |
} |
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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); |
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print_bin(bits, len); |
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", |
bits, len, i, pos, file, func, line); |
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return i; |
} |
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#define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
#define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
#define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
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#endif /* TRACE */ |
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/** |
* write unsigned exp golomb code. |
*/ |
static inline void set_ue_golomb(PutBitContext *pb, int i) |
{ |
av_assert2(i >= 0); |
|
#if 0 |
if (i = 0) { |
put_bits(pb, 1, 1); |
return; |
} |
#endif |
if (i < 256) |
put_bits(pb, ff_ue_golomb_len[i], i + 1); |
else { |
int e = av_log2(i + 1); |
put_bits(pb, 2 * e + 1, i + 1); |
} |
} |
|
/** |
* write truncated unsigned exp golomb code. |
*/ |
static inline void set_te_golomb(PutBitContext *pb, int i, int range) |
{ |
av_assert2(range >= 1); |
av_assert2(i <= range); |
|
if (range == 2) |
put_bits(pb, 1, i ^ 1); |
else |
set_ue_golomb(pb, i); |
} |
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/** |
* write signed exp golomb code. 16 bits at most. |
*/ |
static inline void set_se_golomb(PutBitContext *pb, int i) |
{ |
#if 0 |
if (i <= 0) |
i = -2 * i; |
else |
i = 2 * i - 1; |
#elif 1 |
i = 2 * i - 1; |
if (i < 0) |
i ^= -1; //FIXME check if gcc does the right thing |
#else |
i = 2 * i - 1; |
i ^= (i >> 31); |
#endif |
set_ue_golomb(pb, i); |
} |
|
/** |
* write unsigned golomb rice code (ffv1). |
*/ |
static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, |
int esc_len) |
{ |
int e; |
|
av_assert2(i >= 0); |
|
e = i >> k; |
if (e < limit) |
put_bits(pb, e + k + 1, (1 << k) + (i & ((1 << k) - 1))); |
else |
put_bits(pb, limit + esc_len, i - limit + 1); |
} |
|
/** |
* write unsigned golomb rice code (jpegls). |
*/ |
static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, |
int limit, int esc_len) |
{ |
int e; |
|
av_assert2(i >= 0); |
|
e = (i >> k) + 1; |
if (e < limit) { |
while (e > 31) { |
put_bits(pb, 31, 0); |
e -= 31; |
} |
put_bits(pb, e, 1); |
if (k) |
put_sbits(pb, k, i); |
} else { |
while (limit > 31) { |
put_bits(pb, 31, 0); |
limit -= 31; |
} |
put_bits(pb, limit, 1); |
put_bits(pb, esc_len, i - 1); |
} |
} |
|
/** |
* write signed golomb rice code (ffv1). |
*/ |
static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, |
int esc_len) |
{ |
int v; |
|
v = -2 * i - 1; |
v ^= (v >> 31); |
|
set_ur_golomb(pb, v, k, limit, esc_len); |
} |
|
/** |
* write signed golomb rice code (flac). |
*/ |
static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, |
int limit, int esc_len) |
{ |
int v; |
|
v = -2 * i - 1; |
v ^= (v >> 31); |
|
set_ur_golomb_jpegls(pb, v, k, limit, esc_len); |
} |
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#endif /* AVCODEC_GOLOMB_H */ |