yading@11: /*
yading@11:  * SAUCE header parser
yading@11:  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * SAUCE header parser
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "avformat.h"
yading@11: #include "sauce.h"
yading@11: 
yading@11: int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height)
yading@11: {
yading@11:     AVIOContext *pb = avctx->pb;
yading@11:     char buf[36];
yading@11:     int datatype, filetype, t1, t2, nb_comments;
yading@11:     uint64_t start_pos = avio_size(pb) - 128;
yading@11: 
yading@11:     avio_seek(pb, start_pos, SEEK_SET);
yading@11:     if (avio_read(pb, buf, 7) != 7)
yading@11:         return -1;
yading@11:     if (memcmp(buf, "SAUCE00", 7))
yading@11:         return -1;
yading@11: 
yading@11: #define GET_SAUCE_META(name,size) \
yading@11:     if (avio_read(pb, buf, size) == size && buf[0]) { \
yading@11:         buf[size] = 0; \
yading@11:         av_dict_set(&avctx->metadata, name, buf, 0); \
yading@11:     }
yading@11: 
yading@11:     GET_SAUCE_META("title",     35)
yading@11:     GET_SAUCE_META("artist",    20)
yading@11:     GET_SAUCE_META("publisher", 20)
yading@11:     GET_SAUCE_META("date",      8)
yading@11:     avio_skip(pb, 4);
yading@11:     datatype    = avio_r8(pb);
yading@11:     filetype    = avio_r8(pb);
yading@11:     t1          = avio_rl16(pb);
yading@11:     t2          = avio_rl16(pb);
yading@11:     nb_comments = avio_r8(pb);
yading@11:     avio_skip(pb, 1); /* flags */
yading@11:     avio_skip(pb, 4);
yading@11:     GET_SAUCE_META("encoder",   22);
yading@11: 
yading@11:     if (got_width && datatype && filetype) {
yading@11:         if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) {
yading@11:             if (t1) {
yading@11:                 avctx->streams[0]->codec->width = t1<<3;
yading@11:                 *got_width = 1;
yading@11:             }
yading@11:             if (get_height && t2)
yading@11:                 avctx->streams[0]->codec->height = t2<<4;
yading@11:         } else if (datatype == 5) {
yading@11:             if (filetype) {
yading@11:                 avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4;
yading@11:                 *got_width = 1;
yading@11:             }
yading@11:             if (get_height && t2)
yading@11:                 avctx->streams[0]->codec->height = t2<<4;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     *fsize -= 128;
yading@11: 
yading@11:     if (nb_comments > 0) {
yading@11:         avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET);
yading@11:         if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) {
yading@11:             int i;
yading@11:             char *str = av_malloc(65*nb_comments + 1);
yading@11:             *fsize -= 64*nb_comments + 5;
yading@11:             if (!str)
yading@11:                 return 0;
yading@11:             for (i = 0; i < nb_comments; i++) {
yading@11:                 if (avio_read(pb, str + 65*i, 64) != 64)
yading@11:                     break;
yading@11:                 str[65*i + 64] = '\n';
yading@11:             }
yading@11:             str[65*i] = 0;
yading@11:             av_dict_set(&avctx->metadata, "comment", str, AV_DICT_DONT_STRDUP_VAL);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }