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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /media/ffvpx/libavcodec/golomb.h | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | media/ffvpx/libavcodec/golomb.h | 616 |
1 files changed, 616 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/golomb.h b/media/ffvpx/libavcodec/golomb.h new file mode 100644 index 0000000000..164c2583b6 --- /dev/null +++ b/media/ffvpx/libavcodec/golomb.h @@ -0,0 +1,616 @@ +/* + * exp golomb vlc stuff + * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> + * Copyright (c) 2004 Alex Beregszaszi + * + * This file is part of FFmpeg. + * + * FFmpeg 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, + * 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 + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * @brief + * exp golomb vlc stuff + * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi + */ + +#ifndef AVCODEC_GOLOMB_H +#define AVCODEC_GOLOMB_H + +#include <stdint.h> + +#include "get_bits.h" + +#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_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]; + +/** + * 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; + + skip_bits_long(gb, 32 - log); + if (log < 7) + return AVERROR_INVALIDDATA; + buf >>= log; + buf--; + + return buf; + } +#else + OPEN_READER(re, gb); + UPDATE_CACHE(re, gb); + buf = GET_CACHE(re, gb); + + if (buf >= (1 << 27)) { + buf >>= 32 - 9; + LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); + CLOSE_READER(re, gb); + + return ff_ue_golomb_vlc_code[buf]; + } else { + int log = 2 * av_log2(buf) - 31; + LAST_SKIP_BITS(re, gb, 32 - log); + CLOSE_READER(re, gb); + if (log < 7) + return AVERROR_INVALIDDATA; + buf >>= log; + buf--; + + return buf; + } +#endif +} + +/** + * 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. + * If the value encountered is not in 0..31, the return value + * is outside the range 0..30. + */ +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); + + 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]; +} + +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); + + 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 { + unsigned ret = 1; + + do { + buf >>= 32 - 8; + LAST_SKIP_BITS(re, 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]; + UPDATE_CACHE(re, gb); + buf = GET_CACHE(re, gb); + } while (ret<0x8000000U && BITS_AVAILABLE(re, gb)); + + CLOSE_READER(re, gb); + return ret - 1; + } +#endif +} + +/** + * read unsigned truncated exp golomb code. + */ +static inline int get_te0_golomb(GetBitContext *gb, int range) +{ + av_assert2(range >= 1); + + if (range == 1) + return 0; + else if (range == 2) + return get_bits1(gb) ^ 1; + else + return get_ue_golomb(gb); +} + +/** + * read unsigned truncated exp golomb code. + */ +static inline int get_te_golomb(GetBitContext *gb, int range) +{ + av_assert2(range >= 1); + + if (range == 2) + return get_bits1(gb) ^ 1; + else + return get_ue_golomb(gb); +} + +/** + * read signed exp golomb code. + */ +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); + + if (buf >= (1 << 27)) { + buf >>= 32 - 9; + LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); + CLOSE_READER(re, gb); + + return ff_se_golomb_vlc_code[buf]; + } else { + int log = av_log2(buf), sign; + LAST_SKIP_BITS(re, gb, 31 - log); + UPDATE_CACHE(re, gb); + buf = GET_CACHE(re, gb); + + buf >>= log; + + LAST_SKIP_BITS(re, gb, 32 - log); + CLOSE_READER(re, gb); + + sign = -(buf & 1); + buf = ((buf >> 1) ^ sign) - sign; + + return buf; + } +#endif +} + +static inline int get_se_golomb_long(GetBitContext *gb) +{ + unsigned int buf = get_ue_golomb_long(gb); + int sign = (buf & 1) - 1; + return ((buf >> 1) ^ sign) + 1; +} + +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(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); + + 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 { + int log; + 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; + } +#endif +} + +static inline int dirac_get_se_golomb(GetBitContext *gb) +{ + uint32_t ret = get_interleaved_ue_golomb(gb); + + if (ret) { + int sign = -get_bits1(gb); + ret = (ret ^ sign) - sign; + } + + return ret; +} + +/** + * 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; + +#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); + + log = av_log2(buf); + + if (log > 31 - limit) { + buf >>= log - k; + buf += (30U - log) << k; + LAST_SKIP_BITS(re, gb, 32 + k - log); + CLOSE_READER(re, gb); + + return buf; + } else { + 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; + } +#endif +} + +/** + * 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; + +#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); + + log = av_log2(buf); + + av_assert2(k <= 31); + + if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) && + 32 - log < limit) { + buf >>= log - k; + buf += (30U - log) << k; + LAST_SKIP_BITS(re, gb, 32 + k - log); + CLOSE_READER(re, gb); + + return buf; + } else { + int 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, MIN_CACHE_BITS); + UPDATE_CACHE(re, gb); + } + 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) { + if (k > MIN_CACHE_BITS - 1) { + buf = SHOW_UBITS(re, gb, 16) << (k-16); + LAST_SKIP_BITS(re, gb, 16); + UPDATE_CACHE(re, gb); + buf |= SHOW_UBITS(re, gb, k-16); + LAST_SKIP_BITS(re, gb, k-16); + } else { + buf = SHOW_UBITS(re, gb, k); + LAST_SKIP_BITS(re, gb, k); + } + } else { + buf = 0; + } + + buf += ((SUINT)i << k); + } else if (i == limit - 1) { + buf = SHOW_UBITS(re, gb, esc_len); + LAST_SKIP_BITS(re, gb, esc_len); + + buf ++; + } else { + buf = -1; + } + CLOSE_READER(re, gb); + return buf; + } +#endif +} + +/** + * read signed golomb rice code (ffv1). + */ +static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, + int esc_len) +{ + unsigned v = get_ur_golomb(gb, k, limit, esc_len); + 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) +{ + unsigned 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); + return (uvar >> 1) ^ -(uvar & 1); +} + +#ifdef TRACE + +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); + int len = get_bits_count(s) - pos; + int bits = show >> (24 - len); + + 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, 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); + int len = get_bits_count(s) - pos; + int bits = show >> (24 - len); + + 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, const char *func, + int line) +{ + int show = show_bits(s, 24); + int pos = get_bits_count(s); + int i = get_te0_golomb(s, r); + int len = get_bits_count(s) - pos; + int bits = show >> (24 - len); + + 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; +} + +#define get_ue_golomb(a) get_ue(a, __FILE__, __func__, __LINE__) +#define get_se_golomb(a) get_se(a, __FILE__, __func__, __LINE__) +#define get_te_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) +#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) + +#endif /* TRACE */ +#endif /* AVCODEC_GOLOMB_H */ |