3 * Copyright (c) 2012 Paul B Mahol
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
27 #include "libavutil/bswap.h"
28 #include "libavutil/common.h"
32 typedef struct BMPParseContext
{
35 uint32_t remaining_size
;
38 static int bmp_parse(AVCodecParserContext
*s
, AVCodecContext
*avctx
,
39 const uint8_t **poutbuf
, int *poutbuf_size
,
40 const uint8_t *buf
, int buf_size
)
42 BMPParseContext
*bpc
= s
->priv_data
;
43 uint64_t state
= bpc
->pc
.state64
;
44 int next
= END_NOT_FOUND
;
50 if (bpc
->pc
.frame_start_found
<= 2+4+4) {
51 for (; i
< buf_size
; i
++) {
52 state
= (state
<< 8) | buf
[i
];
53 if (bpc
->pc
.frame_start_found
== 0) {
54 if ((state
>> 48) == (('B' << 8) | 'M')) {
55 bpc
->fsize
= av_bswap32(state
>> 16);
56 bpc
->pc
.frame_start_found
= 1;
58 } else if (bpc
->pc
.frame_start_found
== 2+4+4) {
59 // unsigned hsize = av_bswap32(state>>32);
60 unsigned ihsize
= av_bswap32(state
);
61 if (ihsize
< 12 || ihsize
> 200) {
62 bpc
->pc
.frame_start_found
= 0;
65 bpc
->pc
.frame_start_found
++;
66 bpc
->remaining_size
= bpc
->fsize
+ i
- 17;
68 if (bpc
->pc
.index
+ i
> 17) {
72 } else if (bpc
->pc
.frame_start_found
)
73 bpc
->pc
.frame_start_found
++;
75 bpc
->pc
.state64
= state
;
77 if (bpc
->remaining_size
) {
78 i
= FFMIN(bpc
->remaining_size
, buf_size
);
79 bpc
->remaining_size
-= i
;
80 if (bpc
->remaining_size
)
83 bpc
->pc
.frame_start_found
= 0;
89 if (ff_combine_frame(&bpc
->pc
, next
, &buf
, &buf_size
) < 0)
92 bpc
->pc
.frame_start_found
= 0;
95 *poutbuf_size
= buf_size
;
99 AVCodecParser ff_bmp_parser
= {
100 .codec_ids
= { AV_CODEC_ID_BMP
},
101 .priv_data_size
= sizeof(BMPParseContext
),
102 .parser_parse
= bmp_parse
,
103 .parser_close
= ff_parse_close
,