mirror of
https://github.com/FFmpeg/FFmpeg.git
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155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/*
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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_zero_extend(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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#endif /* AVCODEC_PUT_GOLOMB_H */
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