1 files changed, 127 insertions, 0 deletions
diff --git a/src/video-support/QuicktimeMetdataLoader.vala b/src/video-support/QuicktimeMetdataLoader.vala
new file mode 100644
index 0000000..0a831d2
--- /dev/null
+++ b/src/video-support/QuicktimeMetdataLoader.vala
@@ -0,0 +1,127 @@
+public class QuickTimeMetadataLoader {
+
+    // Quicktime calendar date/time format is number of seconds since January 1, 1904.
+    // This converts to UNIX time (66 years + 17 leap days).
+    public const int64 QUICKTIME_EPOCH_ADJUSTMENT = 2082844800;
+
+    private File file = null;
+
+    public QuickTimeMetadataLoader(File file) {
+        this.file = file;
+    }
+
+    public MetadataDateTime? get_creation_date_time() {
+        var dt = get_creation_date_time_for_quicktime();
+        if (dt == null) {
+            return null;
+        } else {
+            return new MetadataDateTime(dt);
+        }
+    }
+
+    public string? get_title() {
+        // Not supported.
+        return null;
+    }
+
+    // Checks if the given file is a QuickTime file.
+    public bool is_supported() {
+        QuickTimeAtom test = new QuickTimeAtom(file);
+
+        bool ret = false;
+        try {
+            test.open_file();
+            test.read_atom();
+
+            // Look for the header.
+            if ("ftyp" == test.get_current_atom_name()) {
+                ret = true;
+            } else {
+                // Some versions of QuickTime don't have
+                // an ftyp section, so we'll just look
+                // for the mandatory moov section.
+                while(true) {
+                    if ("moov" == test.get_current_atom_name()) {
+                        ret = true;
+                        break;
+                    }
+                    test.next_atom();
+                    test.read_atom();
+                    if (test.is_last_atom()) {
+                        break;
+                    }
+                }
+            }
+        } catch (GLib.Error e) {
+            debug("Error while testing for QuickTime file for %s: %s", file.get_path(), e.message);
+        }
+
+        try {
+            test.close_file();
+        } catch (GLib.Error e) {
+            debug("Error while closing Quicktime file: %s", e.message);
+        }
+        return ret;
+    }
+
+    private DateTime? get_creation_date_time_for_quicktime() {
+        QuickTimeAtom test = new QuickTimeAtom(file);
+        DateTime? timestamp = null;
+
+        try {
+            test.open_file();
+            bool done = false;
+            while(!done) {
+                // Look for "moov" section.
+                test.read_atom();
+                if (test.is_last_atom()) break;
+                if ("moov" == test.get_current_atom_name()) {
+                    QuickTimeAtom child = test.get_first_child_atom();
+                    while (!done) {
+                        // Look for "mvhd" section, or break if none is found.
+                        child.read_atom();
+                        if (child.is_last_atom() || 0 == child.section_size_remaining()) {
+                            done = true;
+                            break;
+                        }
+
+                        if ("mvhd" == child.get_current_atom_name()) {
+                            // Skip 4 bytes (version + flags)
+                            child.read_uint32();
+                            // Grab the timestamp.
+
+                            // Some Android phones package videos recorded with their internal cameras in a 3GP
+                            // container that looks suspiciously like a QuickTime container but really isn't -- for
+                            // the timestamps of these Android 3GP videos are relative to the UNIX epoch
+                            // (January 1, 1970) instead of the QuickTime epoch (January 1, 1904). So, if we detect a
+                            // QuickTime movie with a negative timestamp, we can be pretty sure it isn't a valid
+                            // QuickTime movie that was shot before 1904 but is instead a non-compliant 3GP video
+                            // file. If we detect such a video, we correct its time. See this Redmine ticket
+                            // (https://bugzilla.gnome.org/show_bug.cgi?id=717384) for more information.
+
+                            if ((child.read_uint32() - QUICKTIME_EPOCH_ADJUSTMENT) < 0) {
+                                timestamp = new DateTime.from_unix_utc(child.read_uint32());
+                            } else {
+                                timestamp = new DateTime.from_unix_utc(child.read_uint32() - QUICKTIME_EPOCH_ADJUSTMENT);
+                            }
+                            done = true;
+                            break;
+                        }
+                        child.next_atom();
+                    }
+                }
+                test.next_atom();
+            }
+        } catch (GLib.Error e) {
+            debug("Error while testing for QuickTime file: %s", e.message);
+        }
+
+        try {
+            test.close_file();
+        } catch (GLib.Error e) {
+            debug("Error while closing Quicktime file: %s", e.message);
+        }
+
+        return timestamp;
+    }
+}