mirror of https://git.ffmpeg.org/ffmpeg.git
554 lines
13 KiB
C
554 lines
13 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 unsigned exp golomb code.
|
|
*/
|
|
static inline int get_ue_golomb(GetBitContext *gb){
|
|
unsigned int buf;
|
|
int log;
|
|
|
|
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{
|
|
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);
|
|
|
|
return ff_ue_golomb_vlc_code[buf];
|
|
}
|
|
|
|
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;
|
|
int log;
|
|
|
|
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{
|
|
log= 2*av_log2(buf) - 31;
|
|
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;
|
|
}
|
|
}
|
|
|
|
static inline int svq3_get_se_golomb(GetBitContext *gb){
|
|
unsigned int buf;
|
|
int log;
|
|
|
|
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{
|
|
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 buf;
|
|
uint32_t ret;
|
|
|
|
ret = svq3_get_ue_golomb(gb);
|
|
|
|
if (ret) {
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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 += (30-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);
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
if (uvar & 1)
|
|
return ~(uvar >> 1);
|
|
else
|
|
return 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);
|
|
|
|
print_bin(bits, 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);
|
|
|
|
print_bin(bits, 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);
|
|
|
|
print_bin(bits, 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__, __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__)
|
|
|
|
#endif
|
|
|
|
/**
|
|
* write unsigned exp golomb code.
|
|
*/
|
|
static inline void set_ue_golomb(PutBitContext *pb, int i){
|
|
int e;
|
|
|
|
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{
|
|
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){
|
|
#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);
|
|
}
|
|
|
|
#endif /* AVCODEC_GOLOMB_H */
|