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/*
* SAUCE header parser
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
*
* 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
*/
/**
* @file
* SAUCE header parser
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "sauce.h"
int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height)
{
AVIOContext *pb = avctx->pb;
char buf[36];
int datatype, filetype, t1, t2, nb_comments;
uint64_t start_pos = avio_size(pb) - 128;
avio_seek(pb, start_pos, SEEK_SET);
if (avio_read(pb, buf, 7) != 7)
return -1;
if (memcmp(buf, "SAUCE00", 7))
return -1;
#define GET_SAUCE_META(name,size) \
if (avio_read(pb, buf, size) == size && buf[0]) { \
buf[size] = 0; \
av_dict_set(&avctx->metadata, name, buf, 0); \
}
GET_SAUCE_META("title", 35)
GET_SAUCE_META("artist", 20)
GET_SAUCE_META("publisher", 20)
GET_SAUCE_META("date", 8)
avio_skip(pb, 4);
datatype = avio_r8(pb);
filetype = avio_r8(pb);
t1 = avio_rl16(pb);
t2 = avio_rl16(pb);
nb_comments = avio_r8(pb);
avio_skip(pb, 1); /* flags */
avio_skip(pb, 4);
GET_SAUCE_META("encoder", 22);
if (got_width && datatype && filetype) {
if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) {
if (t1) {
avctx->streams[0]->codec->width = t1<<3;
*got_width = 1;
}
if (get_height && t2)
avctx->streams[0]->codec->height = t2<<4;
} else if (datatype == 5) {
if (filetype > 1) {
avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4;
*got_width = 1;
}
if (get_height && t2)
avctx->streams[0]->codec->height = t2<<4;
}
}
*fsize -= 128;
if (nb_comments > 0) {
avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET);
if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) {
int i;
char *str = av_malloc(65*nb_comments + 1);
*fsize -= 64*nb_comments + 5;
if (!str)
return 0;
for (i = 0; i < nb_comments; i++) {
if (avio_read(pb, str + 65*i, 64) != 64)
break;
str[65*i + 64] = '\n';
}
str[65*i] = 0;
av_dict_set(&avctx->metadata, "comment", str, AV_DICT_DONT_STRDUP_VAL);
}
}
return 0;
}
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