diff options
Diffstat (limited to 'media/ffvpx/libavcodec/get_bits.h')
| -rw-r--r-- | media/ffvpx/libavcodec/get_bits.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/get_bits.h b/media/ffvpx/libavcodec/get_bits.h index 0f183e0358..0c7f5ff0c6 100644 --- a/media/ffvpx/libavcodec/get_bits.h +++ b/media/ffvpx/libavcodec/get_bits.h @@ -229,6 +229,20 @@ static inline int get_xbits(GetBitContext *s, int n) return (NEG_USR32(sign ^ cache, n) ^ sign) - sign; } +static inline int get_xbits_le(GetBitContext *s, int n) +{ + register int sign; + register int32_t cache; + OPEN_READER(re, s); + av_assert2(n>0 && n<=25); + UPDATE_CACHE_LE(re, s); + cache = GET_CACHE(re, s); + sign = sign_extend(~cache, n) >> 31; + LAST_SKIP_BITS(re, s, n); + CLOSE_READER(re, s); + return (zero_extend(sign ^ cache, n) ^ sign) - sign; +} + static inline int get_sbits(GetBitContext *s, int n) { register int tmp; @@ -331,6 +345,7 @@ static inline void skip_bits1(GetBitContext *s) */ static inline unsigned int get_bits_long(GetBitContext *s, int n) { + av_assert2(n>=0 && n<=32); if (!n) { return 0; } else if (n <= MIN_CACHE_BITS) { @@ -369,6 +384,10 @@ static inline uint64_t get_bits64(GetBitContext *s, int n) */ static inline int get_sbits_long(GetBitContext *s, int n) { + // sign_extend(x, 0) is undefined + if (!n) + return 0; + return sign_extend(get_bits_long(s, n), n); } @@ -531,6 +550,7 @@ static inline const uint8_t *align_get_bits(GetBitContext *s) * @param max_depth is the number of times bits bits must be read to completely * read the longest vlc code * = (max_vlc_length + bits - 1) / bits + * @returns the code parsed or -1 if no vlc matches */ static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth) |