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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-07-23 09:06:59 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-07-23 09:06:59 +0200
commit4ea2cc3bd4a7d9b1c54a9d33e6a1cf82e7c8c21d (patch)
treed2e54377d14d604356c86862a326f64ae64dadd6 /src/MediaMetadata.vala
Imported Upstream version 0.18.1upstream/0.18.1
Diffstat (limited to 'src/MediaMetadata.vala')
-rw-r--r--src/MediaMetadata.vala128
1 files changed, 128 insertions, 0 deletions
diff --git a/src/MediaMetadata.vala b/src/MediaMetadata.vala
new file mode 100644
index 0000000..ad0d719
--- /dev/null
+++ b/src/MediaMetadata.vala
@@ -0,0 +1,128 @@
+/* Copyright 2010-2014 Yorba Foundation
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later). See the COPYING file in this distribution.
+ */
+
+public abstract class MediaMetadata {
+ public MediaMetadata() {
+ }
+
+ public abstract void read_from_file(File file) throws Error;
+
+ public abstract MetadataDateTime? get_creation_date_time();
+
+ public abstract string? get_title();
+
+ public abstract string? get_comment();
+}
+
+public struct MetadataRational {
+ public int numerator;
+ public int denominator;
+
+ public MetadataRational(int numerator, int denominator) {
+ this.numerator = numerator;
+ this.denominator = denominator;
+ }
+
+ private bool is_component_valid(int component) {
+ return (component >= 0) && (component <= 1000000);
+ }
+
+ public bool is_valid() {
+ return (is_component_valid(numerator) && is_component_valid(denominator));
+ }
+
+ public string to_string() {
+ return (is_valid()) ? ("%d/%d".printf(numerator, denominator)) : "";
+ }
+}
+
+public errordomain MetadataDateTimeError {
+ INVALID_FORMAT,
+ UNSUPPORTED_FORMAT
+}
+
+public class MetadataDateTime {
+
+ private time_t timestamp;
+
+ public MetadataDateTime(time_t timestamp) {
+ this.timestamp = timestamp;
+ }
+
+ public MetadataDateTime.from_exif(string label) throws MetadataDateTimeError {
+ if (!from_exif_date_time(label, out timestamp))
+ throw new MetadataDateTimeError.INVALID_FORMAT("%s is not EXIF format date/time", label);
+ }
+
+ public MetadataDateTime.from_iptc(string date, string time) throws MetadataDateTimeError {
+ // TODO: Support IPTC date/time format
+ throw new MetadataDateTimeError.UNSUPPORTED_FORMAT("IPTC date/time format not currently supported");
+ }
+
+ public MetadataDateTime.from_xmp(string label) throws MetadataDateTimeError {
+ TimeVal time_val = TimeVal();
+ if (!time_val.from_iso8601(label))
+ throw new MetadataDateTimeError.INVALID_FORMAT("%s is not XMP format date/time", label);
+
+ timestamp = time_val.tv_sec;
+ }
+
+ public time_t get_timestamp() {
+ return timestamp;
+ }
+
+ public string get_exif_label() {
+ return to_exif_date_time(timestamp);
+ }
+
+ // TODO: get_iptc_date() and get_iptc_time()
+
+ public string get_xmp_label() {
+ TimeVal time_val = TimeVal();
+ time_val.tv_sec = timestamp;
+ time_val.tv_usec = 0;
+
+ return time_val.to_iso8601();
+ }
+
+ public static bool from_exif_date_time(string date_time, out time_t timestamp) {
+ timestamp = 0;
+
+ Time tm = Time();
+
+ // Check standard EXIF format
+ if (date_time.scanf("%d:%d:%d %d:%d:%d",
+ &tm.year, &tm.month, &tm.day, &tm.hour, &tm.minute, &tm.second) != 6) {
+ // Fallback in a more generic format
+ string tmp = date_time.dup();
+ tmp.canon("0123456789", ' ');
+ if (tmp.scanf("%4d%2d%2d%2d%2d%2d",
+ &tm.year, &tm.month, &tm.day, &tm.hour, &tm.minute,&tm.second) != 6)
+ return false;
+ }
+
+ // watch for bogosity
+ if (tm.year <= 1900 || tm.month <= 0 || tm.day < 0 || tm.hour < 0 || tm.minute < 0 || tm.second < 0)
+ return false;
+
+ tm.year -= 1900;
+ tm.month--;
+ tm.isdst = -1;
+
+ timestamp = tm.mktime();
+
+ return true;
+ }
+
+ public static string to_exif_date_time(time_t timestamp) {
+ return Time.local(timestamp).format("%Y:%m:%d %H:%M:%S");
+ }
+
+ public string to_string() {
+ return to_exif_date_time(timestamp);
+ }
+}
+