747 lines
18 KiB
C
Executable file
747 lines
18 KiB
C
Executable file
/*
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* exp golomb vlc 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 stuff
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* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
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*/
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#ifndef AVCODEC_GOLOMB_H
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#define AVCODEC_GOLOMB_H
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#include <stdint.h>
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#include "get_bits.h"
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#include "put_bits.h"
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#define INVALID_VLC 0x80000000
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extern const uint8_t ff_golomb_vlc_len[512];
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extern const uint8_t ff_ue_golomb_vlc_code[512];
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extern const int8_t ff_se_golomb_vlc_code[512];
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extern const uint8_t ff_ue_golomb_len[256];
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extern const uint8_t ff_interleaved_golomb_vlc_len[256];
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extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
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extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
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extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256];
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/**
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* Read an unsigned Exp-Golomb code in the range 0 to 8190.
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*
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* @returns the read value or a negative error code.
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*/
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static inline int get_ue_golomb(GetBitContext *gb)
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{
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unsigned int buf;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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if (buf >= (1 << 27)) {
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buf >>= 32 - 9;
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skip_bits_long(gb, ff_golomb_vlc_len[buf]);
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return ff_ue_golomb_vlc_code[buf];
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} else {
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int log = 2 * av_log2(buf) - 31;
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buf >>= log;
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buf--;
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skip_bits_long(gb, 32 - log);
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return buf;
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}
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#else
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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if (buf >= (1 << 27)) {
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buf >>= 32 - 9;
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LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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return ff_ue_golomb_vlc_code[buf];
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} else {
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int log = 2 * av_log2(buf) - 31;
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LAST_SKIP_BITS(re, gb, 32 - log);
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CLOSE_READER(re, gb);
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if (log < 7) {
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av_log(NULL, AV_LOG_ERROR, "Invalid UE golomb code\n");
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return AVERROR_INVALIDDATA;
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}
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buf >>= log;
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buf--;
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return buf;
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}
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#endif
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}
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/**
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* Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
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*/
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static inline unsigned get_ue_golomb_long(GetBitContext *gb)
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{
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unsigned buf, log;
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buf = show_bits_long(gb, 32);
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log = 31 - av_log2(buf);
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skip_bits_long(gb, log);
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return get_bits_long(gb, log + 1) - 1;
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}
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/**
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* read unsigned exp golomb code, constraint to a max of 31.
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* the return value is undefined if the stored value exceeds 31.
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*/
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static inline int get_ue_golomb_31(GetBitContext *gb)
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{
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unsigned int buf;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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buf >>= 32 - 9;
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skip_bits_long(gb, ff_golomb_vlc_len[buf]);
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#else
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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buf >>= 32 - 9;
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LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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#endif
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return ff_ue_golomb_vlc_code[buf];
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}
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static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb)
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{
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uint32_t buf;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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if (buf & 0xAA800000) {
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buf >>= 32 - 8;
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skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]);
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return ff_interleaved_ue_golomb_vlc_code[buf];
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} else {
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unsigned ret = 1;
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do {
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buf >>= 32 - 8;
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skip_bits_long(gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
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if (ff_interleaved_golomb_vlc_len[buf] != 9) {
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ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
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ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
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break;
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}
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ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
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buf = show_bits_long(gb, 32);
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} while (get_bits_left(gb) > 0);
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return ret - 1;
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}
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#else
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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if (buf & 0xAA800000) {
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buf >>= 32 - 8;
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LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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return ff_interleaved_ue_golomb_vlc_code[buf];
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} else {
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unsigned ret = 1;
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do {
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buf >>= 32 - 8;
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LAST_SKIP_BITS(re, gb,
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FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
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if (ff_interleaved_golomb_vlc_len[buf] != 9) {
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ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
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ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
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break;
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}
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ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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} while (ret<0x8000000U && BITS_AVAILABLE(re, gb));
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CLOSE_READER(re, gb);
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return ret - 1;
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}
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#endif
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}
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/**
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* read unsigned truncated exp golomb code.
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*/
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static inline int get_te0_golomb(GetBitContext *gb, int range)
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{
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av_assert2(range >= 1);
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if (range == 1)
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return 0;
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else if (range == 2)
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return get_bits1(gb) ^ 1;
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else
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return get_ue_golomb(gb);
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}
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/**
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* read unsigned truncated exp golomb code.
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*/
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static inline int get_te_golomb(GetBitContext *gb, int range)
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{
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av_assert2(range >= 1);
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if (range == 2)
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return get_bits1(gb) ^ 1;
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else
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return get_ue_golomb(gb);
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}
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/**
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* read signed exp golomb code.
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*/
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static inline int get_se_golomb(GetBitContext *gb)
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{
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unsigned int buf;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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if (buf >= (1 << 27)) {
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buf >>= 32 - 9;
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skip_bits_long(gb, ff_golomb_vlc_len[buf]);
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return ff_se_golomb_vlc_code[buf];
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} else {
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int log = 2 * av_log2(buf) - 31;
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buf >>= log;
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skip_bits_long(gb, 32 - log);
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if (buf & 1)
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buf = -(buf >> 1);
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else
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buf = (buf >> 1);
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return buf;
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}
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#else
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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if (buf >= (1 << 27)) {
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buf >>= 32 - 9;
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LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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return ff_se_golomb_vlc_code[buf];
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} else {
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int log = av_log2(buf), sign;
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LAST_SKIP_BITS(re, gb, 31 - log);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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buf >>= log;
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LAST_SKIP_BITS(re, gb, 32 - log);
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CLOSE_READER(re, gb);
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sign = -(buf & 1);
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buf = ((buf >> 1) ^ sign) - sign;
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return buf;
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}
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#endif
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}
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static inline int get_se_golomb_long(GetBitContext *gb)
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{
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unsigned int buf = get_ue_golomb_long(gb);
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int sign = (buf & 1) - 1;
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return ((buf >> 1) ^ sign) + 1;
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}
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static inline int get_interleaved_se_golomb(GetBitContext *gb)
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{
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unsigned int buf;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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if (buf & 0xAA800000) {
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buf >>= 32 - 8;
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skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]);
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return ff_interleaved_se_golomb_vlc_code[buf];
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} else {
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int log;
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skip_bits(gb, 8);
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buf |= 1 | show_bits(gb, 24);
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if ((buf & 0xAAAAAAAA) == 0)
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return INVALID_VLC;
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for (log = 31; (buf & 0x80000000) == 0; log--)
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buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
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skip_bits_long(gb, 63 - 2 * log - 8);
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return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
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}
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#else
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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if (buf & 0xAA800000) {
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buf >>= 32 - 8;
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LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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return ff_interleaved_se_golomb_vlc_code[buf];
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} else {
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int log;
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LAST_SKIP_BITS(re, gb, 8);
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UPDATE_CACHE(re, gb);
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buf |= 1 | (GET_CACHE(re, gb) >> 8);
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if ((buf & 0xAAAAAAAA) == 0)
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return INVALID_VLC;
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for (log = 31; (buf & 0x80000000) == 0; log--)
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buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
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LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8);
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CLOSE_READER(re, gb);
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return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
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}
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#endif
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}
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static inline int dirac_get_se_golomb(GetBitContext *gb)
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{
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uint32_t ret = get_interleaved_ue_golomb(gb);
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if (ret) {
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int sign = -get_bits1(gb);
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ret = (ret ^ sign) - sign;
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}
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return ret;
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}
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/**
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* read unsigned golomb rice code (ffv1).
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*/
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static inline int get_ur_golomb(GetBitContext *gb, int k, int limit,
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int esc_len)
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{
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unsigned int buf;
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int log;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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log = av_log2(buf);
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if (log > 31 - limit) {
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buf >>= log - k;
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buf += (30 - log) << k;
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skip_bits_long(gb, 32 + k - log);
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return buf;
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} else {
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skip_bits_long(gb, limit);
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buf = get_bits_long(gb, esc_len);
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return buf + limit - 1;
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}
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#else
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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log = av_log2(buf);
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if (log > 31 - limit) {
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buf >>= log - k;
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buf += (30U - log) << k;
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LAST_SKIP_BITS(re, gb, 32 + k - log);
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CLOSE_READER(re, gb);
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return buf;
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} else {
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LAST_SKIP_BITS(re, gb, limit);
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UPDATE_CACHE(re, gb);
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buf = SHOW_UBITS(re, gb, esc_len);
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LAST_SKIP_BITS(re, gb, esc_len);
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CLOSE_READER(re, gb);
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return buf + limit - 1;
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}
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#endif
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}
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/**
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* read unsigned golomb rice code (jpegls).
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*/
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static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,
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int esc_len)
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{
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unsigned int buf;
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int log;
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#if CACHED_BITSTREAM_READER
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buf = show_bits_long(gb, 32);
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log = av_log2(buf);
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if (log - k >= 1 && 32 - log < limit) {
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buf >>= log - k;
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buf += (30 - log) << k;
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skip_bits_long(gb, 32 + k - log);
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return buf;
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} else {
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int i;
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for (i = 0;
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i < limit && get_bits1(gb) == 0 && get_bits_left(gb) > 0;
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i++);
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if (i < limit - 1) {
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buf = get_bits_long(gb, k);
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return buf + (i << k);
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} else if (i == limit - 1) {
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buf = get_bits_long(gb, esc_len);
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return buf + 1;
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} else
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return -1;
|
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}
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#else
|
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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log = av_log2(buf);
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|
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av_assert2(k <= 31);
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|
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if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
|
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32 - log < limit) {
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buf >>= log - k;
|
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buf += (30U - log) << k;
|
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LAST_SKIP_BITS(re, gb, 32 + k - log);
|
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CLOSE_READER(re, gb);
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return buf;
|
|
} else {
|
|
int i;
|
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for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) {
|
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if (gb->size_in_bits <= re_index) {
|
|
CLOSE_READER(re, gb);
|
|
return -1;
|
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}
|
|
LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS);
|
|
UPDATE_CACHE(re, gb);
|
|
}
|
|
for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) {
|
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SKIP_BITS(re, gb, 1);
|
|
}
|
|
LAST_SKIP_BITS(re, gb, 1);
|
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UPDATE_CACHE(re, gb);
|
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|
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if (i < limit - 1) {
|
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if (k) {
|
|
if (k > MIN_CACHE_BITS - 1) {
|
|
buf = SHOW_UBITS(re, gb, 16) << (k-16);
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LAST_SKIP_BITS(re, gb, 16);
|
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UPDATE_CACHE(re, gb);
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buf |= SHOW_UBITS(re, gb, k-16);
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LAST_SKIP_BITS(re, gb, k-16);
|
|
} else {
|
|
buf = SHOW_UBITS(re, gb, k);
|
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LAST_SKIP_BITS(re, gb, k);
|
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}
|
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} else {
|
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buf = 0;
|
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}
|
|
|
|
buf += ((SUINT)i << k);
|
|
} else if (i == limit - 1) {
|
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buf = SHOW_UBITS(re, gb, esc_len);
|
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LAST_SKIP_BITS(re, gb, esc_len);
|
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|
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buf ++;
|
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} 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 */
|
|
|
|
/**
|
|
* write unsigned exp golomb code. 2^16 - 2 at most
|
|
*/
|
|
static inline void set_ue_golomb(PutBitContext *pb, int i)
|
|
{
|
|
av_assert2(i >= 0);
|
|
av_assert2(i <= 0xFFFE);
|
|
|
|
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 unsigned exp golomb code. 2^32-2 at most.
|
|
*/
|
|
static inline void set_ue_golomb_long(PutBitContext *pb, uint32_t i)
|
|
{
|
|
av_assert2(i <= (UINT32_MAX - 1));
|
|
|
|
if (i < 256)
|
|
put_bits(pb, ff_ue_golomb_len[i], i + 1);
|
|
else {
|
|
int e = av_log2(i + 1);
|
|
put_bits64(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)
|
|
{
|
|
i = 2 * i - 1;
|
|
if (i < 0)
|
|
i ^= -1; //FIXME check if gcc does the right thing
|
|
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 */
|