1 /*
2 * H.263 parser
3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * H.263 parser
25 */
26
29
31 int vop_found, i;
33
36
37 i=0;
38 if(!vop_found){
39 for(i=0; i<buf_size; i++){
40 state= (state<<8) | buf[i];
41 if(state>>(32-22) == 0x20){
42 i++;
43 vop_found=1;
44 break;
45 }
46 }
47 }
48
49 if(vop_found){
50 for(; i<buf_size; i++){
51 state= (state<<8) | buf[i];
52 if(state>>(32-22) == 0x20){
55 return i-3;
56 }
57 }
58 }
61
63 }
64
67 const uint8_t **poutbuf,
int *poutbuf_size,
69 {
71 int next;
72
74 next = buf_size;
75 } else {
77
80 *poutbuf_size = 0;
81 return buf_size;
82 }
83 }
84
86 *poutbuf_size = buf_size;
87 return next;
88 }
89
95 };
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
void ff_parse_close(AVCodecParserContext *s)
static int h263_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
main external API structure.
uint32_t state
contains the last few bytes in MSB order
AVCodecParser ff_h263_parser
#define PARSER_FLAG_COMPLETE_FRAMES
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)