mirror of https://github.com/FFmpeg/FFmpeg.git
Most users only want to either read or write golomb codes, not both. By splitting these headers one avoids having unnecesssary (get|put)_hits.h inclusions. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>pull/386/head
Andreas Rheinhardt
3 years ago
parent
e228d7b0db
commit
2b541b8c1d
8 changed files with 174 additions and 137 deletions
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/*
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* exp golomb vlc writing stuff |
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
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* Copyright (c) 2004 Alex Beregszaszi |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* @brief |
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* exp golomb vlc writing stuff |
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* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi |
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*/ |
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#ifndef AVCODEC_PUT_GOLOMB_H |
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#define AVCODEC_PUT_GOLOMB_H |
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#include <stdint.h> |
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#include "put_bits.h" |
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extern const uint8_t ff_ue_golomb_len[256]; |
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/**
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* write unsigned exp golomb code. 2^16 - 2 at most |
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*/ |
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static inline void set_ue_golomb(PutBitContext *pb, int i) |
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{ |
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av_assert2(i >= 0); |
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av_assert2(i <= 0xFFFE); |
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if (i < 256) |
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put_bits(pb, ff_ue_golomb_len[i], i + 1); |
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else { |
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int e = av_log2(i + 1); |
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put_bits(pb, 2 * e + 1, i + 1); |
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} |
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} |
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/**
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* write unsigned exp golomb code. 2^32-2 at most. |
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*/ |
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static inline void set_ue_golomb_long(PutBitContext *pb, uint32_t i) |
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{ |
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av_assert2(i <= (UINT32_MAX - 1)); |
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if (i < 256) |
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put_bits(pb, ff_ue_golomb_len[i], i + 1); |
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else { |
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int e = av_log2(i + 1); |
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put_bits64(pb, 2 * e + 1, i + 1); |
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} |
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} |
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/**
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* write truncated unsigned exp golomb code. |
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*/ |
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static inline void set_te_golomb(PutBitContext *pb, int i, int range) |
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{ |
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av_assert2(range >= 1); |
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av_assert2(i <= range); |
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if (range == 2) |
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put_bits(pb, 1, i ^ 1); |
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else |
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set_ue_golomb(pb, i); |
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} |
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/**
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* write signed exp golomb code. 16 bits at most. |
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*/ |
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static inline void set_se_golomb(PutBitContext *pb, int i) |
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{ |
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i = 2 * i - 1; |
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if (i < 0) |
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i ^= -1; //FIXME check if gcc does the right thing
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set_ue_golomb(pb, i); |
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} |
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/**
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* write unsigned golomb rice code (ffv1). |
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*/ |
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static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, |
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int esc_len) |
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{ |
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int e; |
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av_assert2(i >= 0); |
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e = i >> k; |
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if (e < limit) |
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put_bits(pb, e + k + 1, (1 << k) + av_mod_uintp2(i, k)); |
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else |
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put_bits(pb, limit + esc_len, i - limit + 1); |
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} |
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/**
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* write unsigned golomb rice code (jpegls). |
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*/ |
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static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, |
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int limit, int esc_len) |
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{ |
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int e; |
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av_assert2(i >= 0); |
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e = (i >> k) + 1; |
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if (e < limit) { |
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while (e > 31) { |
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put_bits(pb, 31, 0); |
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e -= 31; |
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} |
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put_bits(pb, e, 1); |
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if (k) |
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put_sbits(pb, k, i); |
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} else { |
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while (limit > 31) { |
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put_bits(pb, 31, 0); |
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limit -= 31; |
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} |
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put_bits(pb, limit, 1); |
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put_bits(pb, esc_len, i - 1); |
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} |
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} |
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/**
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* write signed golomb rice code (ffv1). |
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*/ |
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static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, |
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int esc_len) |
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{ |
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int v; |
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v = -2 * i - 1; |
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v ^= (v >> 31); |
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set_ur_golomb(pb, v, k, limit, esc_len); |
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} |
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/**
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* write signed golomb rice code (flac). |
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*/ |
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static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, |
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int limit, int esc_len) |
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{ |
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int v; |
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v = -2 * i - 1; |
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v ^= (v >> 31); |
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set_ur_golomb_jpegls(pb, v, k, limit, esc_len); |
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} |
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#endif /* AVCODEC_PUT_GOLOMB_H */ |
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