* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2004 Alex Beregszaszi
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
+
/**
- * @file golomb.h
- * @brief
+ * @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_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){
+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 = 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;
- buf>>= log;
+ } else {
+ int log = 2 * av_log2(buf) - 31;
+ buf >>= log;
buf--;
LAST_SKIP_BITS(re, gb, 32 - log);
CLOSE_READER(re, gb);
-
+
return buf;
}
}
-static inline int svq3_get_ue_golomb(GetBitContext *gb){
+/**
+ * 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;
- int log;
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- if(buf&0xAA800000){
+ 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{
- 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);
- }
+ 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 (BITS_AVAILABLE(re, gb));
- LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
CLOSE_READER(re, gb);
-
- return ((buf << log) >> log) - 1;
+ return ret - 1;
}
}
/**
* read unsigned truncated exp golomb code.
*/
-static inline int get_te0_golomb(GetBitContext *gb, int range){
+static inline int get_te0_golomb(GetBitContext *gb, int range)
+{
assert(range >= 1);
-
- if(range==1) return 0;
- else if(range==2) return get_bits1(gb)^1;
- else return get_ue_golomb(gb);
+
+ 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){
+static inline int get_te_golomb(GetBitContext *gb, int range)
+{
assert(range >= 1);
-
- if(range==2) return get_bits1(gb)^1;
- else return get_ue_golomb(gb);
-}
+ 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){
+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 = 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;
-
+ } else {
+ int 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);
+
+ if (buf & 1)
+ buf = -(buf >> 1);
+ else
+ buf = (buf >> 1);
return buf;
}
}
-static inline int svq3_get_se_golomb(GetBitContext *gb){
+static inline int get_se_golomb_long(GetBitContext *gb)
+{
+ unsigned int buf = get_ue_golomb_long(gb);
+
+ if (buf & 1)
+ buf = (buf + 1) >> 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);
+ buf = GET_CACHE(re, gb);
- if(buf&0xAA800000){
+ 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{
+ } else {
+ int log;
LAST_SKIP_BITS(re, gb, 8);
UPDATE_CACHE(re, gb);
buf |= 1 | (GET_CACHE(re, gb) >> 8);
- if((buf & 0xAAAAAAAA) == 0)
+ if ((buf & 0xAAAAAAAA) == 0)
return INVALID_VLC;
- for(log=31; (buf & 0x80000000) == 0; log--){
+ 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);
+ 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 = 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;
+}
+
/**
* read unsigned golomb rice code (ffv1).
*/
-static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len){
+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);
+ buf = GET_CACHE(re, gb);
- log= av_log2(buf);
+ log = av_log2(buf);
- if(log > 31-limit){
+ if (log > 31 - limit) {
buf >>= log - k;
- buf += (30-log)<<k;
+ buf += (30 - log) << k;
LAST_SKIP_BITS(re, gb, 32 + k - log);
CLOSE_READER(re, gb);
-
+
return buf;
- }else{
- buf >>= 32 - limit - esc_len;
- LAST_SKIP_BITS(re, gb, esc_len + limit);
+ } 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){
+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);
+ buf = GET_CACHE(re, gb);
- log= av_log2(buf);
-
- if(log > 31-11){
+ 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;
+ buf += (30 - log) << k;
LAST_SKIP_BITS(re, gb, 32 + k - log);
CLOSE_READER(re, gb);
-
+
return buf;
- }else{
+ } else {
int i;
- for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){
+ for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0 && BITS_AVAILABLE(re, gb); i++) {
LAST_SKIP_BITS(re, gb, 1);
UPDATE_CACHE(re, gb);
}
SKIP_BITS(re, gb, 1);
- if(i < limit - 1){
- if(k){
+ if (i < limit - 1) {
+ if (k) {
buf = SHOW_UBITS(re, gb, k);
LAST_SKIP_BITS(re, gb, k);
- }else{
- buf=0;
+ } else {
+ buf = 0;
}
CLOSE_READER(re, gb);
- return buf + (i<<k);
- }else if(i == limit - 1){
+ 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
+ } 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);
-
+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);
-
+ 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);
+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);
+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)
+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;
}
-
-
#ifdef TRACE
-static inline int get_ue(GetBitContext *s, 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);
-
+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);
-
+
+ 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, 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);
-
+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);
-
+
+ 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);
-
+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);
-
+
+ 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_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
+#endif /* TRACE */
/**
* write unsigned exp golomb code.
*/
-static inline void set_ue_golomb(PutBitContext *pb, int i){
- int e;
-
- assert(i>=0);
+static inline void set_ue_golomb(PutBitContext *pb, int i)
+{
+ assert(i >= 0);
#if 0
- if(i=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);
+ 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){
+static inline void set_te_golomb(PutBitContext *pb, int i, int range)
+{
assert(range >= 1);
- assert(i<=range);
+ assert(i <= range);
- if(range==2) put_bits(pb, 1, i^1);
- else set_ue_golomb(pb, i);
+ 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 (i>32767 || i<-32767)
-// av_log(NULL,AV_LOG_ERROR,"value out of range %d\n", i);
-#if 0
- if(i<=0) i= -2*i;
- else i= 2*i-1;
+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
+ 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);
+ 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){
+static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit,
+ int esc_len)
+{
int e;
-
- assert(i>=0);
-
- e= i>>k;
- if(e<limit){
- put_bits(pb, e + k + 1, (1<<k) + (i&((1<<k)-1)));
- }else{
+
+ assert(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){
+static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k,
+ int limit, int esc_len)
+{
int e;
-
- assert(i>=0);
-
- e= (i>>k) + 1;
- if(e<limit){
+
+ assert(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_bits(pb, k, i&((1<<k)-1));
- }else{
- put_bits(pb, limit , 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){
+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);
+ 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){
+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);
+ v = -2 * i - 1;
+ v ^= (v >> 31);
set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
}
+
+#endif /* AVCODEC_GOLOMB_H */
projects / ffmpeg / blobdiff