| 1 | /* |
| 2 | * SAUCE header parser |
| 3 | * Copyright (c) 2010 Peter Ross <pross@xvid.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * SAUCE header parser |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/intreadwrite.h" |
| 28 | #include "libavutil/dict.h" |
| 29 | #include "avformat.h" |
| 30 | #include "sauce.h" |
| 31 | |
| 32 | int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height) |
| 33 | { |
| 34 | AVIOContext *pb = avctx->pb; |
| 35 | char buf[36]; |
| 36 | int datatype, filetype, t1, t2, nb_comments; |
| 37 | uint64_t start_pos = avio_size(pb) - 128; |
| 38 | |
| 39 | avio_seek(pb, start_pos, SEEK_SET); |
| 40 | if (avio_read(pb, buf, 7) != 7) |
| 41 | return -1; |
| 42 | if (memcmp(buf, "SAUCE00", 7)) |
| 43 | return -1; |
| 44 | |
| 45 | #define GET_SAUCE_META(name,size) \ |
| 46 | if (avio_read(pb, buf, size) == size && buf[0]) { \ |
| 47 | buf[size] = 0; \ |
| 48 | av_dict_set(&avctx->metadata, name, buf, 0); \ |
| 49 | } |
| 50 | |
| 51 | GET_SAUCE_META("title", 35) |
| 52 | GET_SAUCE_META("artist", 20) |
| 53 | GET_SAUCE_META("publisher", 20) |
| 54 | GET_SAUCE_META("date", 8) |
| 55 | avio_skip(pb, 4); |
| 56 | datatype = avio_r8(pb); |
| 57 | filetype = avio_r8(pb); |
| 58 | t1 = avio_rl16(pb); |
| 59 | t2 = avio_rl16(pb); |
| 60 | nb_comments = avio_r8(pb); |
| 61 | avio_skip(pb, 1); /* flags */ |
| 62 | avio_skip(pb, 4); |
| 63 | GET_SAUCE_META("encoder", 22); |
| 64 | |
| 65 | if (got_width && datatype && filetype) { |
| 66 | if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) { |
| 67 | if (t1) { |
| 68 | avctx->streams[0]->codec->width = t1<<3; |
| 69 | *got_width = 1; |
| 70 | } |
| 71 | if (get_height && t2) |
| 72 | avctx->streams[0]->codec->height = t2<<4; |
| 73 | } else if (datatype == 5) { |
| 74 | if (filetype) { |
| 75 | avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4; |
| 76 | *got_width = 1; |
| 77 | } |
| 78 | if (get_height && t2) |
| 79 | avctx->streams[0]->codec->height = t2<<4; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | *fsize -= 128; |
| 84 | |
| 85 | if (nb_comments > 0) { |
| 86 | avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET); |
| 87 | if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) { |
| 88 | int i; |
| 89 | char *str = av_malloc(65*nb_comments + 1); |
| 90 | *fsize -= 64*nb_comments + 5; |
| 91 | if (!str) |
| 92 | return 0; |
| 93 | for (i = 0; i < nb_comments; i++) { |
| 94 | if (avio_read(pb, str + 65*i, 64) != 64) |
| 95 | break; |
| 96 | str[65*i + 64] = '\n'; |
| 97 | } |
| 98 | str[65*i] = 0; |
| 99 | av_dict_set(&avctx->metadata, "comment", str, AV_DICT_DONT_STRDUP_VAL); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | } |