/* * SAUCE header parser * Copyright (c) 2010 Peter Ross <pross@xvid.org> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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; }