* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2004 Alex Beregszaszi
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * 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
+ * @file
* @brief
* exp golomb vlc stuff
* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
#define AVCODEC_GOLOMB_H
#include <stdint.h>
-#include "bitstream.h"
+#include "get_bits.h"
+#include "put_bits.h"
#define INVALID_VLC 0x80000000
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];
/**
}
}
-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);
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);
+ unsigned ret = 1;
- if((buf & 0xAAAAAAAA) == 0)
- return INVALID_VLC;
+ do {
+ buf >>= 32 - 8;
+ LAST_SKIP_BITS(re, gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
- for(log=31; (buf & 0x80000000) == 0; log--){
- buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
- }
+ 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 (HAVE_BITS_REMAINING(re, gb));
- LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
CLOSE_READER(re, gb);
-
- return ((buf << log) >> log) - 1;
+ return ret - 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).
*/
return buf;
}else{
- buf >>= 32 - limit - esc_len;
- LAST_SKIP_BITS(re, gb, esc_len + limit);
+ 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;
log= av_log2(buf);
- if(log > 31-11){
+ 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);
return buf;
}else{
int i;
- for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){
+ for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0 && HAVE_BITS_REMAINING(re, gb); i++) {
LAST_SKIP_BITS(re, gb, 1);
UPDATE_CACHE(re, gb);
}
#ifdef TRACE
-static inline int get_ue(GetBitContext *s, char *file, const char *func, int line){
+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);
return i;
}
-static inline int get_se(GetBitContext *s, char *file, const char *func, int line){
+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);
* 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;
}
put_bits(pb, e, 1);
if(k)
- put_bits(pb, k, i&((1<<k)-1));
+ put_sbits(pb, k, i);
}else{
while(limit > 31) {
put_bits(pb, 31, 0);
set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
}
-#endif // AVCODEC_GOLOMB_H
+#endif /* AVCODEC_GOLOMB_H */
projects / ffmpeg / blobdiff