path: root/libavcodec/mqc.h (plain)
blob: 8bf7223d419e91dd6c46cdb5edf2e893dbb22060

1	/*
2	* MQ-coder: structures, common and decoder functions
3	* Copyright (c) 2007 Kamil Nowosad
4	*
5	* This file is part of FFmpeg.
6	*
7	* FFmpeg is free software; you can redistribute it and/or
8	* modify it under the terms of the GNU Lesser General Public
9	* License as published by the Free Software Foundation; either
10	* version 2.1 of the License, or (at your option) any later version.
11	*
12	* FFmpeg is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15	* Lesser General Public License for more details.
16	*
17	* You should have received a copy of the GNU Lesser General Public
18	* License along with FFmpeg; if not, write to the Free Software
19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	*/
21
22	#ifndef AVCODEC_MQC_H
23	#define AVCODEC_MQC_H
24
25	/**
26	* MQ-coder
27	* @file
28	* @author Kamil Nowosad
29	*/
30
31	#include <stdint.h>
32
33	#define MQC_CX_UNI 17
34	#define MQC_CX_RL 18
35
36	extern uint16_t ff_mqc_qe[2 * 47];
37	extern uint8_t ff_mqc_nlps[2 * 47];
38	extern uint8_t ff_mqc_nmps[2 * 47];
39
40	typedef struct MqcState {
41	uint8_t *bp, *bpstart;
42	unsigned int a;
43	unsigned int c;
44	unsigned int ct;
45	uint8_t cx_states[19];
46	int raw;
47	} MqcState;
48
49	/* encoder */
50
51	/** initialize the encoder */
52	void ff_mqc_initenc(MqcState *mqc, uint8_t *bp);
53
54	/** code bit d with context cx */
55	void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d);
56
57	/** number of encoded bytes */
58	int ff_mqc_length(MqcState *mqc);
59
60	/** flush the encoder [returns number of bytes encoded] */
61	int ff_mqc_flush(MqcState *mqc);
62	int ff_mqc_flush_to(MqcState *mqc, uint8_t *dst, int *dst_len);
63
64	/* decoder */
65
66	/**
67	* Initialize MQ-decoder.
68	* @param mqc MQ decoder state
69	* @param bp byte pointer
70	* @param raw raw mode
71	* @param reset reset states
72	*/
73	void ff_mqc_initdec(MqcState *mqc, uint8_t *bp, int raw, int reset);
74
75	/**
76	* MQ decoder.
77	* @param mqc MQ decoder state
78	* @param cxstate Context
79	* @return Decision (0 to 1)
80	*/
81	int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
82
83	/* common */
84
85	/**
86	* MQ-coder Initialize context tables (QE, NLPS, NMPS)
87	*/
88	void ff_mqc_init_context_tables(void);
89
90	/**
91	* MQ-coder context initialisations.
92	* @param mqc MQ-coder context
93	*/
94	void ff_mqc_init_contexts(MqcState *mqc);
95
96	#endif /* AVCODEC_MQC_H */
97