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Add ff_sauce_read()

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Originally committed as revision 24300 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross 2010-07-18 08:05:04 +00:00
parent beaa963cab
commit 0459bf2d02
2 changed files with 136 additions and 0 deletions
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99
libavformat/sauce.c Normal file
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/*
* @file
* 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
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "sauce.h"
int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height)
{
ByteIOContext *pb = avctx->pb;
char buf[36];
int datatype, filetype, t1, t2, nb_comments, flags;
uint64_t start_pos = url_fsize(pb) - 128;
url_fseek(pb, start_pos, SEEK_SET);
if (get_buffer(pb, buf, 7) != 7)
return -1;
if (memcmp(buf, "SAUCE00", 7))
return -1;
#define GET_SAUCE_META(name,size) \
if (get_buffer(pb, buf, size) == size && buf[0]) { \
buf[size] = 0; \
av_metadata_set2(&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)
url_fskip(pb, 4);
datatype = get_byte(pb);
filetype = get_byte(pb);
t1 = get_le16(pb);
t2 = get_le16(pb);
nb_comments = get_byte(pb);
flags = get_byte(pb);
url_fskip(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) {
url_fseek(pb, start_pos - 64*nb_comments - 5, SEEK_SET);
if (get_buffer(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 (get_buffer(pb, str + 65*i, 64) != 64)
break;
str[65*i + 64] = '\n';
}
str[65*i] = 0;
av_metadata_set2(&avctx->metadata, "comment", str, AV_METADATA_DONT_STRDUP_VAL);
}
}
return 0;
}

37
libavformat/sauce.h Normal file
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/*
* @file
* 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
*/
#ifndef AVFORMAT_SAUCE_H
#define AVFORMAT_SAUCE_H
#include "avformat.h"
/**
* @param avctx AVFormatContext
* @param fsize[out] return length of file, less SAUCE header
* @param got_width[out] set to non-zero if SAUCE header reported height
* @param get_height Tell SAUCE header to parse height
*/
int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height);
#endif /* AVFORMAT_SAUCE_H */