3 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
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
29 #define DNXHD_HEADER_PREFIX 0x000002800100
34 int cur_field
; /* first field is 0, second is 1 */
37 static int dnxhd_find_frame_end(DNXHDParserContext
*dctx
,
38 const uint8_t *buf
, int buf_size
)
40 ParseContext
*pc
= &dctx
->pc
;
41 uint64_t state
= pc
->state64
;
42 int pic_found
= pc
->frame_start_found
;
44 int interlaced
= dctx
->interlaced
;
45 int cur_field
= dctx
->cur_field
;
48 for (i
= 0; i
< buf_size
; i
++) {
49 state
= (state
<< 8) | buf
[i
];
50 if ((state
& 0xffffffffff00LL
) == DNXHD_HEADER_PREFIX
) {
53 interlaced
= (state
&2)>>1; /* byte following the 5-byte header prefix */
61 if (!buf_size
) /* EOF considered as end of frame */
63 for (; i
< buf_size
; i
++) {
64 state
= (state
<< 8) | buf
[i
];
65 if ((state
& 0xffffffffff00LL
) == DNXHD_HEADER_PREFIX
) {
66 if (!interlaced
|| dctx
->cur_field
) {
67 pc
->frame_start_found
= 0;
69 dctx
->interlaced
= interlaced
;
73 /* continue, to get the second field */
74 dctx
->interlaced
= interlaced
= (state
&2)>>1;
75 dctx
->cur_field
= cur_field
= state
&1;
80 pc
->frame_start_found
= pic_found
;
82 dctx
->interlaced
= interlaced
;
83 dctx
->cur_field
= cur_field
;
87 static int dnxhd_parse(AVCodecParserContext
*s
,
88 AVCodecContext
*avctx
,
89 const uint8_t **poutbuf
, int *poutbuf_size
,
90 const uint8_t *buf
, int buf_size
)
92 DNXHDParserContext
*dctx
= s
->priv_data
;
93 ParseContext
*pc
= &dctx
->pc
;
96 if (s
->flags
& PARSER_FLAG_COMPLETE_FRAMES
) {
99 next
= dnxhd_find_frame_end(dctx
, buf
, buf_size
);
100 if (ff_combine_frame(pc
, next
, &buf
, &buf_size
) < 0) {
107 *poutbuf_size
= buf_size
;
111 AVCodecParser ff_dnxhd_parser
= {
112 .codec_ids
= { AV_CODEC_ID_DNXHD
},
113 .priv_data_size
= sizeof(DNXHDParserContext
),
114 .parser_parse
= dnxhd_parse
,
115 .parser_close
= ff_parse_close
,