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libavcodec
mqc.h
Go to the documentation of this file.
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/*
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* MQ-coder: structures, common and decoder functions
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* Copyright (c) 2007 Kamil Nowosad
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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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#ifndef AVCODEC_MQC_H
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#define AVCODEC_MQC_H
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/**
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* MQ-coder
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* @file
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* @author Kamil Nowosad
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*/
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#include <stdint.h>
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#define MQC_CX_UNI 17
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#define MQC_CX_RL 18
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extern
uint16_t
ff_mqc_qe
[2 * 47];
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extern
uint8_t
ff_mqc_nlps
[2 * 47];
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extern
uint8_t
ff_mqc_nmps
[2 * 47];
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typedef
struct
MqcState
{
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uint8_t
*
bp
, *
bpstart
;
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unsigned
int
a
;
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unsigned
int
c
;
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unsigned
int
ct
;
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uint8_t
cx_states
[19];
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}
MqcState
;
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/* encoder */
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/** initialize the encoder */
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void
ff_mqc_initenc
(
MqcState
*mqc,
uint8_t
*bp);
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/** code bit d with context cx */
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void
ff_mqc_encode
(
MqcState
*mqc,
uint8_t
*cxstate,
int
d);
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/** number of encoded bytes */
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int
ff_mqc_length
(
MqcState
*mqc);
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/** flush the encoder [returns number of bytes encoded] */
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int
ff_mqc_flush
(
MqcState
*mqc);
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/* decoder */
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/**
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* Initialize MQ-decoder.
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* @param mqc MQ decoder state
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* @param bp byte poiter
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*/
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void
ff_mqc_initdec
(
MqcState
*mqc,
uint8_t
*bp);
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/**
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* MQ decoder.
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* @param mqc MQ decoder state
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* @param cxstate Context
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* @return Decision (0 ot 1)
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*/
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int
ff_mqc_decode
(
MqcState
*mqc,
uint8_t
*cxstate);
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/* common */
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/**
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* MQ-coder Initialize context tables (QE, NLPS, NMPS)
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*/
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void
ff_mqc_init_context_tables
(
void
);
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/**
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* MQ-coder context initialisations.
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* @param mqc MQ-coder context
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*/
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void
ff_mqc_init_contexts
(
MqcState
*mqc);
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#endif
/* AVCODEC_MQC_H */
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