| /* |
| * 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" |
| #include "put_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_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]; |
| extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; |
| |
| /** |
| * Read an unsigned Exp-Golomb code in the range 0 to 8190. |
| */ |
| static inline int get_ue_golomb(GetBitContext *gb) |
| { |
| unsigned int buf; |
| |
| 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) { |
| av_log(NULL, AV_LOG_ERROR, "Invalid UE golomb code\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| buf >>= log; |
| buf--; |
| |
| return buf; |
| } |
| } |
| |
| /** |
| * 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. |
| * the return value is undefined if the stored value exceeds 31. |
| */ |
| static inline int get_ue_golomb_31(GetBitContext *gb) |
| { |
| unsigned int buf; |
| |
| 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); |
| |
| return ff_ue_golomb_vlc_code[buf]; |
| } |
| |
| static inline unsigned svq3_get_ue_golomb(GetBitContext *gb) |
| { |
| uint32_t buf; |
| |
| 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; |
| } |
| } |
| |
| /** |
| * 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; |
| |
| 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; |
| } |
| } |
| |
| 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 svq3_get_se_golomb(GetBitContext *gb) |
| { |
| unsigned int buf; |
| |
| 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; |
| } |
| } |
| |
| static inline int dirac_get_se_golomb(GetBitContext *gb) |
| { |
| uint32_t ret = svq3_get_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; |
| |
| 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; |
| } |
| } |
| |
| /** |
| * 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 - 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 < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { |
| if (gb->size_in_bits <= re_index) |
| return -1; |
| LAST_SKIP_BITS(re, gb, 1); |
| UPDATE_CACHE(re, gb); |
| } |
| SKIP_BITS(re, gb, 1); |
| |
| 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; |
| } |
| |
| 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) |
| { |
| 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); |
| |
| print_bin(bits, 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); |
| |
| print_bin(bits, 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); |
| |
| print_bin(bits, 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__, __PRETTY_FUNCTION__, __LINE__) |
| #define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| #define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| #define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| |
| #endif /* TRACE */ |
| |
| /** |
| * write unsigned exp golomb code. |
| */ |
| static inline void set_ue_golomb(PutBitContext *pb, int i) |
| { |
| av_assert2(i >= 0); |
| |
| if (i < 256) |
| put_bits(pb, ff_ue_golomb_len[i], i + 1); |
| else { |
| int e = av_log2(i + 1); |
| put_bits(pb, 2 * e + 1, i + 1); |
| } |
| } |
| |
| /** |
| * write truncated unsigned exp golomb code. |
| */ |
| static inline void set_te_golomb(PutBitContext *pb, int i, int range) |
| { |
| av_assert2(range >= 1); |
| av_assert2(i <= range); |
| |
| if (range == 2) |
| put_bits(pb, 1, i ^ 1); |
| else |
| set_ue_golomb(pb, i); |
| } |
| |
| /** |
| * write signed exp golomb code. 16 bits at most. |
| */ |
| static inline void set_se_golomb(PutBitContext *pb, int i) |
| { |
| #if 0 |
| if (i <= 0) |
| i = -2 * i; |
| else |
| i = 2 * i - 1; |
| #elif 1 |
| i = 2 * i - 1; |
| if (i < 0) |
| i ^= -1; //FIXME check if gcc does the right thing |
| #else |
| i = 2 * i - 1; |
| i ^= (i >> 31); |
| #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; |
| |
| av_assert2(i >= 0); |
| |
| e = i >> k; |
| if (e < limit) |
| put_bits(pb, e + k + 1, (1 << k) + av_mod_uintp2(i, k)); |
| 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; |
| |
| av_assert2(i >= 0); |
| |
| e = (i >> k) + 1; |
| if (e < limit) { |
| while (e > 31) { |
| put_bits(pb, 31, 0); |
| e -= 31; |
| } |
| put_bits(pb, e, 1); |
| if (k) |
| put_sbits(pb, k, i); |
| } else { |
| while (limit > 31) { |
| put_bits(pb, 31, 0); |
| limit -= 31; |
| } |
| 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); |
| } |
| |
| #endif /* AVCODEC_GOLOMB_H */ |
