3 * Copyright (c) 2007 Kamil Nowosad
5 * This file is part of FFmpeg.
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.
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.
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
25 * @author Kamil Nowosad
30 static void byteout(MqcState
*mqc
)
33 if (*mqc
->bp
== 0xff){
35 *mqc
->bp
= mqc
->c
>> 20;
38 } else if ((mqc
->c
& 0x8000000)){
44 *mqc
->bp
= mqc
->c
>> 19;
50 static void renorme(MqcState
*mqc
)
57 } while (!(mqc
->a
& 0x8000));
60 static void setbits(MqcState
*mqc
)
62 int tmp
= mqc
->c
+ mqc
->a
;
68 void ff_mqc_initenc(MqcState
*mqc
, uint8_t *bp
)
70 ff_mqc_init_contexts(mqc
);
75 mqc
->ct
= 12 + (*mqc
->bp
== 0xff);
78 void ff_mqc_encode(MqcState
*mqc
, uint8_t *cxstate
, int d
)
82 qe
= ff_mqc_qe
[*cxstate
];
84 if ((*cxstate
& 1) == d
){
85 if (!(mqc
->a
& 0x8000)){
90 *cxstate
= ff_mqc_nmps
[*cxstate
];
99 *cxstate
= ff_mqc_nlps
[*cxstate
];
104 int ff_mqc_length(MqcState
*mqc
)
106 return mqc
->bp
- mqc
->bpstart
;
109 int ff_mqc_flush(MqcState
*mqc
)
112 mqc
->c
= mqc
->c
<< mqc
->ct
;
114 mqc
->c
= mqc
->c
<< mqc
->ct
;
116 if (*mqc
->bp
!= 0xff)
118 return mqc
->bp
- mqc
->bpstart
;