3 * Copyright (c) 2013 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"
30 typedef struct DPXParseContext
{
34 uint32_t remaining_size
;
38 static int dpx_parse(AVCodecParserContext
*s
, AVCodecContext
*avctx
,
39 const uint8_t **poutbuf
, int *poutbuf_size
,
40 const uint8_t *buf
, int buf_size
)
42 DPXParseContext
*d
= s
->priv_data
;
43 uint32_t state
= d
->pc
.state
;
44 int next
= END_NOT_FOUND
;
47 s
->pict_type
= AV_PICTURE_TYPE_I
;
53 if (!d
->pc
.frame_start_found
) {
54 for (; i
< buf_size
; i
++) {
55 state
= (state
<< 8) | buf
[i
];
56 if (state
== MKBETAG('S','D','P','X') ||
57 state
== MKTAG('S','D','P','X')) {
58 d
->pc
.frame_start_found
= 1;
59 d
->is_be
= state
== MKBETAG('S','D','P','X');
66 if (d
->remaining_size
) {
67 i
= FFMIN(d
->remaining_size
, buf_size
);
68 d
->remaining_size
-= i
;
69 if (d
->remaining_size
)
74 for (;d
->pc
.frame_start_found
&& i
< buf_size
; i
++) {
75 d
->pc
.state
= (d
->pc
.state
<< 8) | buf
[i
];
78 d
->fsize
= d
->is_be
? d
->pc
.state
: av_bswap32(d
->pc
.state
);
79 if (d
->fsize
<= 1664) {
80 d
->pc
.frame_start_found
= 0;
83 if (d
->fsize
> buf_size
- i
+ 19)
84 d
->remaining_size
= d
->fsize
- buf_size
+ i
- 19;
89 } else if (d
->index
> 17) {
90 if (d
->pc
.state
== MKBETAG('S','D','P','X') ||
91 d
->pc
.state
== MKTAG('S','D','P','X')) {
99 if (ff_combine_frame(&d
->pc
, next
, &buf
, &buf_size
) < 0)
102 d
->pc
.frame_start_found
= 0;
105 *poutbuf_size
= buf_size
;
109 AVCodecParser ff_dpx_parser
= {
110 .codec_ids
= { AV_CODEC_ID_DPX
},
111 .priv_data_size
= sizeof(DPXParseContext
),
112 .parser_parse
= dpx_parse
,
113 .parser_close
= ff_parse_close
,