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authorJörg Frings-Fürst <debian@jff.email>2023-06-14 20:36:37 +0200
committerJörg Frings-Fürst <debian@jff.email>2023-06-14 20:36:37 +0200
commitbb80d3feebdc9acc52e3f4ad24084d8425f043a2 (patch)
tree2084a84c39f159c6aea254775dc0880d52579d45 /src/video-support/QuicktimeMetdataLoader.vala
parentb26ff0798252a1a8072dd2c7a67f6205de9fde11 (diff)
parent31804433d72460cbe0a39f9f8ea5e76058d84cda (diff)
Merge branch 'feature/upstream' into develop
Diffstat (limited to 'src/video-support/QuicktimeMetdataLoader.vala')
-rw-r--r--src/video-support/QuicktimeMetdataLoader.vala127
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
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+++ b/src/video-support/QuicktimeMetdataLoader.vala
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+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;
+ }
+}