diff options
Diffstat (limited to 'libavcodec/golomb.h')
-rw-r--r-- | libavcodec/golomb.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h index f1e6d6d987..9861b18d1a 100644 --- a/libavcodec/golomb.h +++ b/libavcodec/golomb.h @@ -178,6 +178,37 @@ static inline int svq3_get_se_golomb(GetBitContext *gb){ } } +/** + * read unsigned golomb rice code. + */ +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); +//printf("buf:%X log:%d\n", buf, log); + 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 if(log == 31-limit){ + buf >>= log - esc_len; + buf -= 1<<esc_len; + LAST_SKIP_BITS(re, gb, esc_len + limit + 1); + CLOSE_READER(re, gb); + + return buf + 1; + }else + return -1; +} + #ifdef TRACE static inline int get_ue(GetBitContext *s, char *file, char *func, int line){ @@ -279,3 +310,22 @@ static inline void set_se_golomb(PutBitContext *pb, int i){ #endif set_ue_golomb(pb, i); } + +/** + * write unsigned golomb rice code. + */ +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{ +// printf("set %08X, %d\n", (1<<esc_len) + i - 1, limit + esc_len + 1); + put_bits(pb, limit + esc_len + 1, (1<<esc_len) + i - 1); +// put_bits(pb, 1, limit + 1); +// put_bits(pb, i - 1, esc_len); + } +} |