479 lines
12 KiB
C
479 lines
12 KiB
C
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/*
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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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#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);
|
||
|
|
|
||
|
|
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
|
||
|
|
}
|
||
|
|
|
||
|
|
#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 */
|