/*
* exp golomb vlc stuff
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2004 Alex Beregszaszi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* @file golomb.h
* @brief
* exp golomb vlc stuff
- * @author Michael Niedermayer <michaelni@gmx.at>
+ * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
*/
+#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];
+
/**
* read unsigned exp golomb code.
}
}
+static inline int 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 >>= 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);
+ }
+
+ LAST_SKIP_BITS(re, gb, 63 - 2*log - 8);
+ CLOSE_READER(re, gb);
+
+ return ((buf << log) >> log) - 1;
+ }
+}
+
/**
* read unsigned truncated exp golomb code.
*/
}
}
+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;
+ }
+}
+
+/**
+ * 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{
+ buf >>= 32 - limit - esc_len;
+ LAST_SKIP_BITS(re, gb, esc_len + limit);
+ 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 > 31-11){
+ 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; SHOW_UBITS(re, gb, 1) == 0; i++){
+ 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, char *file, char *func, int line){
+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);
print_bin(bits, len);
- printf("%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, char *func, int line){
+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);
print_bin(bits, len);
- printf("%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, char *func, int line){
+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);
print_bin(bits, len);
- printf("%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;
}
#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;
+
+ 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){
+ int e;
+
+ assert(i>=0);
+
+ e= (i>>k) + 1;
+ if(e<limit){
+ put_bits(pb, e, 1);
+ if(k)
+ put_bits(pb, k, i&((1<<k)-1));
+ }else{
+ 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);
+}
projects / ffmpeg / blobdiff