| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 2007 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file plugins/tracklength-mp3.c |
| 19 | * @brief Compute track lengths for MP3 files |
| 20 | */ |
| 21 | #include "tracklength.h" |
| 22 | #include <mad.h> |
| 23 | #include "madshim.h" |
| 24 | |
| 25 | static void *mmap_file(const char *path, size_t *lengthp) { |
| 26 | int fd; |
| 27 | void *base; |
| 28 | struct stat sb; |
| 29 | |
| 30 | if((fd = open(path, O_RDONLY)) < 0) { |
| 31 | disorder_error(errno, "error opening %s", path); |
| 32 | return 0; |
| 33 | } |
| 34 | if(fstat(fd, &sb) < 0) { |
| 35 | disorder_error(errno, "error calling stat on %s", path); |
| 36 | goto error; |
| 37 | } |
| 38 | if(sb.st_size == 0) /* can't map 0-length files */ |
| 39 | goto error; |
| 40 | if((base = mmap(0, sb.st_size, PROT_READ, |
| 41 | MAP_SHARED, fd, 0)) == (void *)-1) { |
| 42 | disorder_error(errno, "error calling mmap on %s", path); |
| 43 | goto error; |
| 44 | } |
| 45 | *lengthp = sb.st_size; |
| 46 | close(fd); |
| 47 | return base; |
| 48 | error: |
| 49 | close(fd); |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | long tl_mp3(const char *path) { |
| 54 | size_t length; |
| 55 | void *base; |
| 56 | buffer b; |
| 57 | |
| 58 | if(!(base = mmap_file(path, &length))) return -1; |
| 59 | b.duration = mad_timer_zero; |
| 60 | scan_mp3(base, length, &b); |
| 61 | munmap(base, length); |
| 62 | return b.duration.seconds + !!b.duration.fraction; |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | Local Variables: |
| 67 | c-basic-offset:2 |
| 68 | comment-column:40 |
| 69 | fill-column:79 |
| 70 | End: |
| 71 | */ |