[grilo-plugins] flickr: Add EXIF tags to grilo keys

[Bastien Nocera <hadess src gnome org>]

commit 40a9efd76b77427ed12b78213961482d1b975093
Author: Rafael Fonseca <r4f4rfs gmail com>
Date:   Fri Jun 17 17:16:10 2016 +0200

    flickr: Add EXIF tags to grilo keys
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707643

 src/flickr/grl-flickr.c |  105 +++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 101 insertions(+), 4 deletions(-)
---
diff --git a/src/flickr/grl-flickr.c b/src/flickr/grl-flickr.c
index 484b6ef..c0de3a2 100644
--- a/src/flickr/grl-flickr.c
+++ b/src/flickr/grl-flickr.c
@@ -32,6 +32,8 @@
 #include <glib/gi18n-lib.h>
 #include <string.h>
 #include <stdlib.h>
+#include <errno.h>
+#include <math.h>
 
 #ifdef GOA_ENABLED
 #define GOA_API_IS_SUBJECT_TO_CHANGE
@@ -546,18 +548,113 @@ update_media (GrlMedia *media, GHashTable *photo)
 }
 
 static void
-getInfo_cb (GFlickr *f, GHashTable *photo, gpointer user_data)
+update_media_exif (GrlMedia *media, GHashTable *photo)
 {
-  GrlSourceResolveSpec *rs = (GrlSourceResolveSpec *) user_data;
+  GHashTableIter iter;
+  gpointer key, value;
+
+  g_hash_table_iter_init (&iter, photo);
+  while (g_hash_table_iter_next (&iter, &key, &value)) {
+    GrlRelatedKeys *relkeys = NULL;
+
+    /*
+     * EXIF tags from: http://www.exif.org/Exif2-2.PDF
+     * and values from:
+     * http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
+     */
+    if (g_strcmp0 (key, "Model") == 0) {
+      relkeys = grl_related_keys_new_with_keys (GRL_METADATA_KEY_CAMERA_MODEL,
+                                                value,
+                                                NULL);
+    } else if (g_strcmp0 (key, "Flash") == 0) {
+      gboolean used = g_str_has_prefix (value, "Fired") ||
+                      g_str_has_prefix (value, "On,") ||
+                      g_str_has_prefix (value, "Auto, Fired");
 
-  if (photo) {
-    update_media (rs->media, photo);
+      relkeys = grl_related_keys_new_with_keys (GRL_METADATA_KEY_FLASH_USED,
+                                                used,
+                                                NULL);
+    } else if (g_strcmp0 (key, "ExposureTime") == 0) {
+      /* ExposureTime is in the format "%d/%d" seconds */
+      gchar *endptr;
+      guint64 num, denom;
+
+      errno = 0;
+      num = g_ascii_strtoull (value, &endptr, 10);
+      if (errno == ERANGE && (num == G_MAXINT64 || num == G_MININT64))
+        continue;
+
+      if (endptr == value || *endptr != '/' || *(endptr +1) == '\0')
+        continue;
+
+      errno = 0;
+      denom = g_ascii_strtoull (endptr + 1, NULL, 10);
+      if ((errno == ERANGE && (denom == G_MAXINT64 || denom == G_MININT64)) ||
+          (errno != 0 && denom == 0))
+        continue;
+
+      relkeys = grl_related_keys_new_with_keys (GRL_METADATA_KEY_EXPOSURE_TIME,
+                                                num / (gdouble) denom,
+                                                NULL);
+    } else if (g_strcmp0 (key, "ISO") == 0) {
+      gdouble iso;
+
+      errno = 0;
+      iso = g_ascii_strtod (value, NULL);
+      if (errno != ERANGE && (fabs (iso) != HUGE_VAL))
+        relkeys = grl_related_keys_new_with_keys (GRL_METADATA_KEY_ISO_SPEED,
+                                                  iso,
+                                                  NULL);
+    } else if (g_strcmp0 (key, "Orientation") == 0) {
+      gint degrees;
+
+      if (g_str_match_string ("rotate 90 cw", value, FALSE))
+        degrees = 90;
+      else if (g_str_match_string ("rotate 180", value, FALSE))
+        degrees = 180;
+      else if (g_str_match_string ("rotate 270 cw", value, FALSE))
+        degrees = 270;
+      else
+        degrees = 0;
+
+      relkeys = grl_related_keys_new_with_keys (GRL_METADATA_KEY_ORIENTATION,
+                                                degrees,
+                                                NULL);
+    }
+
+    if (relkeys)
+      grl_data_add_related_keys (GRL_DATA (media), relkeys);
   }
+}
+
+static void
+getExif_cb (GFlickr *f, GHashTable *photo, gpointer user_data)
+{
+  GrlSourceResolveSpec *rs = (GrlSourceResolveSpec *) user_data;
+
+  if (photo)
+    update_media_exif (rs->media, photo);
 
   rs->callback (rs->source, rs->operation_id, rs->media, rs->user_data, NULL);
 }
 
 static void
+getInfo_cb (GFlickr *f, GHashTable *photo, gpointer user_data)
+{
+  GrlSourceResolveSpec *rs = (GrlSourceResolveSpec *) user_data;
+
+  if (!photo)
+    rs->callback (rs->source, rs->operation_id, rs->media, rs->user_data, NULL);
+
+  update_media (rs->media, photo);
+
+  g_flickr_photos_getExif (f,
+                           grl_media_get_id (rs->media),
+                           getExif_cb,
+                           rs);
+}
+
+static void
 search_cb (GFlickr *f, GList *photolist, gpointer user_data)
 {
   GrlMedia *media;