3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2004 Maarten Daniels
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 static int h261_find_frame_end(ParseContext
*pc
, AVCodecContext
*avctx
,
31 const uint8_t *buf
, int buf_size
)
36 vop_found
= pc
->frame_start_found
;
39 for (i
= 0; i
< buf_size
&& !vop_found
; i
++) {
40 state
= (state
<< 8) | buf
[i
];
41 for (j
= 0; j
< 8; j
++) {
42 if (((state
>> j
) & 0xFFFFF0) == 0x000100) {
49 for (; i
< buf_size
; i
++) {
50 state
= (state
<< 8) | buf
[i
];
51 for (j
= 0; j
< 8; j
++) {
52 if (((state
>> j
) & 0xFFFFF0) == 0x000100) {
53 pc
->frame_start_found
= 0;
54 pc
->state
= (state
>> (3 * 8)) + 0xFF00;
61 pc
->frame_start_found
= vop_found
;
66 static int h261_parse(AVCodecParserContext
*s
,
67 AVCodecContext
*avctx
,
68 const uint8_t **poutbuf
, int *poutbuf_size
,
69 const uint8_t *buf
, int buf_size
)
71 ParseContext
*pc
= s
->priv_data
;
74 if (s
->flags
& PARSER_FLAG_COMPLETE_FRAMES
) {
77 next
= h261_find_frame_end(pc
, avctx
, buf
, buf_size
);
78 if (ff_combine_frame(pc
, next
, &buf
, &buf_size
) < 0) {
85 *poutbuf_size
= buf_size
;
89 AVCodecParser ff_h261_parser
= {
90 .codec_ids
= { AV_CODEC_ID_H261
},
91 .priv_data_size
= sizeof(ParseContext
),
92 .parser_parse
= h261_parse
,
93 .parser_close
= ff_parse_close
,