5bb127a9 |
/* |
6dfa70f2 |
* Copyright (C) 2007 The FFmpeg Project |
5bb127a9 |
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
|
6a5d31ac |
#include "libavutil/intreadwrite.h" |
5bb127a9 |
#include "xiph.h"
|
e5916087 |
int avpriv_split_xiph_headers(const uint8_t *extradata, int extradata_size, |
ad2deb02 |
int first_header_size, const uint8_t *header_start[3], |
5bb127a9 |
int header_len[3])
{ |
b189e670 |
int i; |
5bb127a9 |
|
58720ebd |
if (extradata_size >= 6 && AV_RB16(extradata) == first_header_size) {
int overall_len = 6; |
5bb127a9 |
for (i=0; i<3; i++) {
header_len[i] = AV_RB16(extradata);
extradata += 2;
header_start[i] = extradata;
extradata += header_len[i]; |
58720ebd |
if (overall_len > extradata_size - header_len[i])
return -1;
overall_len += header_len[i]; |
5bb127a9 |
} |
58720ebd |
} else if (extradata_size >= 3 && extradata_size < INT_MAX - 0x1ff && extradata[0] == 2) {
int overall_len = 3; |
b189e670 |
extradata++;
for (i=0; i<2; i++, extradata++) { |
5bb127a9 |
header_len[i] = 0; |
b189e670 |
for (; overall_len < extradata_size && *extradata==0xff; extradata++) { |
5bb127a9 |
header_len[i] += 0xff; |
58720ebd |
overall_len += 0xff + 1; |
5bb127a9 |
} |
b189e670 |
header_len[i] += *extradata;
overall_len += *extradata; |
58720ebd |
if (overall_len > extradata_size) |
5bb127a9 |
return -1;
} |
b189e670 |
header_len[2] = extradata_size - overall_len; |
5bb127a9 |
header_start[0] = extradata;
header_start[1] = header_start[0] + header_len[0];
header_start[2] = header_start[1] + header_len[1];
} else {
return -1;
}
return 0;
} |