mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
0884b1c5ff
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
575 lines
14 KiB
C
575 lines
14 KiB
C
/*
|
|
* 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"
|
|
|
|
#define INVALID_VLC 0x80000000
|
|
|
|
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 an unsigned Exp-Golomb code in the range 0 to 8190.
|
|
*/
|
|
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 (log < 7) {
|
|
av_log(NULL, 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);
|
|
|
|
return ff_ue_golomb_vlc_code[buf];
|
|
}
|
|
|
|
static inline unsigned get_interleaved_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 && BITS_AVAILABLE(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), sign;
|
|
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);
|
|
|
|
sign = -(buf & 1);
|
|
buf = ((buf >> 1) ^ sign) - sign;
|
|
|
|
return buf;
|
|
}
|
|
}
|
|
|
|
static inline int get_se_golomb_long(GetBitContext *gb)
|
|
{
|
|
unsigned int buf = get_ue_golomb_long(gb);
|
|
int sign = (buf & 1) - 1;
|
|
return ((buf >> 1) ^ sign) + 1;
|
|
}
|
|
|
|
static inline int get_interleaved_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);
|
|
|
|
return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
|
|
}
|
|
}
|
|
|
|
static inline int dirac_get_se_golomb(GetBitContext *gb)
|
|
{
|
|
uint32_t ret = get_interleaved_ue_golomb(gb);
|
|
|
|
if (ret) {
|
|
int sign = -get_bits1(gb);
|
|
ret = (ret ^ sign) - sign;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
log = av_log2(buf);
|
|
|
|
if (log > 31 - limit) {
|
|
buf >>= log - k;
|
|
buf += (30U - log) << k;
|
|
LAST_SKIP_BITS(re, gb, 32 + k - log);
|
|
CLOSE_READER(re, gb);
|
|
|
|
return buf;
|
|
} else {
|
|
LAST_SKIP_BITS(re, gb, limit);
|
|
UPDATE_CACHE(re, gb);
|
|
|
|
buf = SHOW_UBITS(re, gb, esc_len);
|
|
|
|
LAST_SKIP_BITS(re, gb, esc_len);
|
|
CLOSE_READER(re, gb);
|
|
|
|
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);
|
|
|
|
av_assert2(k <= 31);
|
|
|
|
if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
|
|
32 - log < limit) {
|
|
buf >>= log - k;
|
|
buf += (30U - 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) {
|
|
CLOSE_READER(re, gb);
|
|
return -1;
|
|
}
|
|
LAST_SKIP_BITS(re, gb, 1);
|
|
UPDATE_CACHE(re, gb);
|
|
}
|
|
SKIP_BITS(re, gb, 1);
|
|
|
|
if (i < limit - 1) {
|
|
if (k) {
|
|
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);
|
|
}
|
|
} else {
|
|
buf = 0;
|
|
}
|
|
|
|
buf += (i << k);
|
|
} else if (i == limit - 1) {
|
|
buf = SHOW_UBITS(re, gb, esc_len);
|
|
LAST_SKIP_BITS(re, gb, esc_len);
|
|
|
|
buf ++;
|
|
} else {
|
|
buf = -1;
|
|
}
|
|
CLOSE_READER(re, gb);
|
|
return buf;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* read signed golomb rice code (ffv1).
|
|
*/
|
|
static inline int get_sr_golomb(GetBitContext *gb, int k, int limit,
|
|
int esc_len)
|
|
{
|
|
unsigned v = get_ur_golomb(gb, k, limit, esc_len);
|
|
return (v >> 1) ^ -(v & 1);
|
|
}
|
|
|
|
/**
|
|
* read signed golomb rice code (flac).
|
|
*/
|
|
static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit,
|
|
int esc_len)
|
|
{
|
|
unsigned v = get_ur_golomb_jpegls(gb, k, limit, esc_len);
|
|
return (v >> 1) ^ -(v & 1);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
return (uvar >> 1) ^ -(uvar & 1);
|
|
}
|
|
|
|
#ifdef TRACE
|
|
|
|
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);
|
|
|
|
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n",
|
|
bits, len, i, pos, file, func, line);
|
|
|
|
return i;
|
|
}
|
|
|
|
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);
|
|
|
|
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n",
|
|
bits, len, i, pos, file, func, line);
|
|
|
|
return i;
|
|
}
|
|
|
|
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);
|
|
|
|
av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n",
|
|
bits, len, i, pos, file, func, line);
|
|
|
|
return i;
|
|
}
|
|
|
|
#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__)
|
|
|
|
#endif /* TRACE */
|
|
|
|
/**
|
|
* write unsigned exp golomb code.
|
|
*/
|
|
static inline void set_ue_golomb(PutBitContext *pb, int i)
|
|
{
|
|
av_assert2(i >= 0);
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* write signed exp golomb code. 16 bits at most.
|
|
*/
|
|
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
|
|
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) + av_mod_uintp2(i, k));
|
|
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);
|
|
}
|
|
|
|
#endif /* AVCODEC_GOLOMB_H */
|