diff options
Diffstat (limited to 'libs/ffvpx/libavcodec/golomb.h')
| -rw-r--r-- | libs/ffvpx/libavcodec/golomb.h | 163 |
1 files changed, 160 insertions, 3 deletions
diff --git a/libs/ffvpx/libavcodec/golomb.h b/libs/ffvpx/libavcodec/golomb.h index efb1eff8a..5cdfa0945 100644 --- a/libs/ffvpx/libavcodec/golomb.h +++ b/libs/ffvpx/libavcodec/golomb.h @@ -49,11 +49,30 @@ extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; /** * Read an unsigned Exp-Golomb code in the range 0 to 8190. + * + * @returns the read value or a negative error code. */ static inline int get_ue_golomb(GetBitContext *gb) { unsigned int buf; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + if (buf >= (1 << 27)) { + buf >>= 32 - 9; + skip_bits_long(gb, ff_golomb_vlc_len[buf]); + + return ff_ue_golomb_vlc_code[buf]; + } else { + int log = 2 * av_log2(buf) - 31; + buf >>= log; + buf--; + skip_bits_long(gb, 32 - log); + + return buf; + } +#else OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -77,6 +96,7 @@ static inline int get_ue_golomb(GetBitContext *gb) return buf; } +#endif } /** @@ -101,6 +121,13 @@ static inline int get_ue_golomb_31(GetBitContext *gb) { unsigned int buf; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + buf >>= 32 - 9; + skip_bits_long(gb, ff_golomb_vlc_len[buf]); +#else + OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -108,6 +135,7 @@ static inline int get_ue_golomb_31(GetBitContext *gb) buf >>= 32 - 9; LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); CLOSE_READER(re, gb); +#endif return ff_ue_golomb_vlc_code[buf]; } @@ -116,6 +144,33 @@ static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb) { uint32_t buf; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + if (buf & 0xAA800000) { + buf >>= 32 - 8; + skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]); + + return ff_interleaved_ue_golomb_vlc_code[buf]; + } else { + unsigned ret = 1; + + do { + buf >>= 32 - 8; + skip_bits_long(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]; + buf = show_bits_long(gb, 32); + } while (get_bits_left(gb) > 0); + + return ret - 1; + } +#else OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -147,6 +202,7 @@ static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb) CLOSE_READER(re, gb); return ret - 1; } +#endif } /** @@ -184,6 +240,28 @@ static inline int get_se_golomb(GetBitContext *gb) { unsigned int buf; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + if (buf >= (1 << 27)) { + buf >>= 32 - 9; + skip_bits_long(gb, ff_golomb_vlc_len[buf]); + + return ff_se_golomb_vlc_code[buf]; + } else { + int log = 2 * av_log2(buf) - 31; + buf >>= log; + + skip_bits_long(gb, 32 - log); + + if (buf & 1) + buf = -(buf >> 1); + else + buf = (buf >> 1); + + return buf; + } +#else OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -210,6 +288,7 @@ static inline int get_se_golomb(GetBitContext *gb) return buf; } +#endif } static inline int get_se_golomb_long(GetBitContext *gb) @@ -223,6 +302,30 @@ static inline int get_interleaved_se_golomb(GetBitContext *gb) { unsigned int buf; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + if (buf & 0xAA800000) { + buf >>= 32 - 8; + skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]); + + return ff_interleaved_se_golomb_vlc_code[buf]; + } else { + int log; + skip_bits(gb, 8); + buf |= 1 | show_bits_long(gb, 24); + + if ((buf & 0xAAAAAAAA) == 0) + return INVALID_VLC; + + for (log = 31; (buf & 0x80000000) == 0; log--) + buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); + + skip_bits_long(gb, 63 - 2 * log - 8); + + return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; + } +#else OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -250,6 +353,7 @@ static inline int get_interleaved_se_golomb(GetBitContext *gb) return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; } +#endif } static inline int dirac_get_se_golomb(GetBitContext *gb) @@ -273,6 +377,24 @@ static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, unsigned int buf; int log; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + log = av_log2(buf); + + if (log > 31 - limit) { + buf >>= log - k; + buf += (30 - log) << k; + skip_bits_long(gb, 32 + k - log); + + return buf; + } else { + skip_bits_long(gb, limit); + buf = get_bits_long(gb, esc_len); + + return buf + limit - 1; + } +#else OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -297,6 +419,7 @@ static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, return buf + limit - 1; } +#endif } /** @@ -308,6 +431,35 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, unsigned int buf; int log; +#if CACHED_BITSTREAM_READER + buf = show_bits_long(gb, 32); + + log = av_log2(buf); + + if (log - k >= 1 && 32 - log < limit) { + buf >>= log - k; + buf += (30 - log) << k; + skip_bits_long(gb, 32 + k - log); + + return buf; + } else { + int i; + for (i = 0; + i < limit && get_bits1(gb) == 0 && get_bits_left(gb) > 0; + i++); + + if (i < limit - 1) { + buf = get_bits_long(gb, k); + + return buf + (i << k); + } else if (i == limit - 1) { + buf = get_bits_long(gb, esc_len); + + return buf + 1; + } else + return -1; + } +#else OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); @@ -326,15 +478,19 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, return buf; } else { int i; - for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { + for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) { if (gb->size_in_bits <= re_index) { CLOSE_READER(re, gb); return -1; } - LAST_SKIP_BITS(re, gb, 1); + LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS); UPDATE_CACHE(re, gb); } - SKIP_BITS(re, gb, 1); + for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { + SKIP_BITS(re, gb, 1); + } + LAST_SKIP_BITS(re, gb, 1); + UPDATE_CACHE(re, gb); if (i < limit - 1) { if (k) { @@ -364,6 +520,7 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, CLOSE_READER(re, gb); return buf; } +#endif } /** |