Split up tracklength module into separate files for each file format.

[disorder] / plugins / tracklength-mp3.c

diff --git a/plugins/tracklength-mp3.c b/plugins/tracklength-mp3.c
new file mode 100644 (file)
index 0000000..ecd1c1e
--- /dev/null
+++ b/plugins/tracklength-mp3.c
@@ -0,0 +1,71 @@
+/*
+ * This file is part of DisOrder.
+ * Copyright (C) 2004, 2005, 2007 Richard Kettlewell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/** @file plugins/tracklength-mp3.c
+ * @brief Compute track lengths for MP3 files
+ */
+#include "tracklength.h"
+#include <mad.h>
+#include "madshim.h"
+
+static void *mmap_file(const char *path, size_t *lengthp) {
+  int fd;
+  void *base;
+  struct stat sb;
+  
+  if((fd = open(path, O_RDONLY)) < 0) {
+    disorder_error(errno, "error opening %s", path);
+    return 0;
+  }
+  if(fstat(fd, &sb) < 0) {
+    disorder_error(errno, "error calling stat on %s", path);
+    goto error;
+  }
+  if(sb.st_size == 0)                  /* can't map 0-length files */
+    goto error;
+  if((base = mmap(0, sb.st_size, PROT_READ,
+                 MAP_SHARED, fd, 0)) == (void *)-1) {
+    disorder_error(errno, "error calling mmap on %s", path);
+    goto error;
+  }
+  *lengthp = sb.st_size;
+  close(fd);
+  return base;
+error:
+  close(fd);
+  return 0;
+}
+
+long tl_mp3(const char *path) {
+  size_t length;
+  void *base;
+  buffer b;
+
+  if(!(base = mmap_file(path, &length))) return -1;
+  b.duration = mad_timer_zero;
+  scan_mp3(base, length, &b);
+  munmap(base, length);
+  return b.duration.seconds + !!b.duration.fraction;
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+End:
+*/