[tracker-miners: 2/3] tracker-extract-libav: Check for all tags also from streams

[Sam Thursfield <sthursfield src gnome org>]

commit 6966ce0718dd7bc62fb70efb4f15a7e8aefc5d5e
Author: Matti Lehtimäki <matti lehtimaki jolla com>
Date:   Sat Aug 27 17:17:46 2022 +0300

    tracker-extract-libav: Check for all tags also from streams
    
    At least in Ogg audio and video files the tags are actually inside the
    streams not in the format context. Check for the tags in suitable streams
    and as fallback for generic information check first the audio stream and
    then finally also video stream.
    
    Fix some existing style issues in code.

 src/tracker-extract/tracker-extract-libav.c | 55 ++++++++++++++++-------------
 1 file changed, 31 insertions(+), 24 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-libav.c b/src/tracker-extract/tracker-extract-libav.c
index b76c67e7f..c5cfaae6d 100644
--- a/src/tracker-extract/tracker-extract-libav.c
+++ b/src/tracker-extract/tracker-extract-libav.c
@@ -30,11 +30,18 @@
 #include <libavformat/avformat.h>
 #include <libavutil/mathematics.h>
 
-static AVDictionaryEntry *find_tag (AVFormatContext *format, AVStream *stream, const gchar *name)
+static AVDictionaryEntry *
+find_tag (AVFormatContext *format,
+          AVStream        *stream1,
+          AVStream        *stream2,
+          const gchar     *name)
 {
-       AVDictionaryEntry *tag = av_dict_get(format->metadata, name, NULL, 0);
-       if (!tag) {
-               tag = av_dict_get(stream->metadata, name, NULL, 0);
+       AVDictionaryEntry *tag = av_dict_get (format->metadata, name, NULL, 0);
+       if (!tag && stream1) {
+               tag = av_dict_get (stream1->metadata, name, NULL, 0);
+       }
+       if (!tag && stream2) {
+               tag = av_dict_get (stream2->metadata, name, NULL, 0);
        }
 
        return tag;
@@ -130,19 +137,19 @@ tracker_extract_get_metadata (TrackerExtractInfo  *info,
                        tracker_resource_set_int64 (metadata, "nfo:frameCount", video_stream->nb_frames);
                }
 
-               if ((tag = av_dict_get (format->metadata, "synopsis", NULL, 0))) {
+               if ((tag = find_tag (format, video_stream, NULL, "synopsis"))) {
                        tracker_resource_set_string (metadata, "nmm:synopsis", tag->value);
                }
 
-               if ((tag = av_dict_get (format->metadata, "episode_sort", NULL, 0))) {
-                       tracker_resource_set_int64 (metadata, "nmm:episodeNumber", atoi(tag->value));
+               if ((tag = find_tag (format, video_stream, NULL, "episode_sort"))) {
+                       tracker_resource_set_int64 (metadata, "nmm:episodeNumber", atoi (tag->value));
                }
 
-               if ((tag = av_dict_get (format->metadata, "season_number", NULL, 0))) {
-                       tracker_resource_set_int64 (metadata, "nmm:season", atoi(tag->value));
+               if ((tag = find_tag (format, video_stream, NULL, "season_number"))) {
+                       tracker_resource_set_int64 (metadata, "nmm:season", atoi (tag->value));
                }
 
-               if ((tag = av_dict_get (format->metadata, "creation_time", NULL, 0))) {
+               if ((tag = find_tag (format, video_stream, NULL, "creation_time"))) {
                        content_created = tracker_date_guess (tag->value);
                        if (content_created) {
                                tracker_resource_set_string (metadata, "nie:contentCreated", content_created);
@@ -163,31 +170,31 @@ tracker_extract_get_metadata (TrackerExtractInfo  *info,
                        tracker_resource_set_int64 (metadata, "nfo:duration", duration);
                }
 
-               if ((tag = find_tag (format, audio_stream, "track"))) {
-                       int track = atoi(tag->value);
+               if ((tag = find_tag (format, audio_stream, NULL, "track"))) {
+                       int track = atoi (tag->value);
                        if (track > 0) {
                                tracker_resource_set_int64 (metadata, "nmm:trackNumber", track);
                        }
                }
 
-               if ((tag = find_tag (format, audio_stream, "album"))) {
+               if ((tag = find_tag (format, audio_stream, NULL, "album"))) {
                        album_title = tag->value;
                }
 
-               if (album_title && (tag = find_tag (format, audio_stream, "album_artist"))) {
+               if (album_title && (tag = find_tag (format, audio_stream, NULL, "album_artist"))) {
                        album_artist_name = tag->value;
                        album_artist = tracker_extract_new_artist (album_artist_name);
                }
 
-               if ((tag = find_tag (format, audio_stream, "artist"))) {
+               if ((tag = find_tag (format, audio_stream, NULL, "artist"))) {
                        artist = tracker_extract_new_artist (tag->value);
                }
 
-               if ((tag = find_tag (format, audio_stream, "performer"))) {
+               if ((tag = find_tag (format, audio_stream, NULL, "performer"))) {
                        performer = tracker_extract_new_artist (tag->value);
                }
 
-               if ((tag = av_dict_get (format->metadata, "date", NULL, 0))) {
+               if ((tag = find_tag (format, audio_stream, NULL, "date"))) {
                        content_created = tracker_date_guess (tag->value);
                        if (content_created) {
                                tracker_resource_set_string (metadata, "nie:contentCreated", content_created);
@@ -202,7 +209,7 @@ tracker_extract_get_metadata (TrackerExtractInfo  *info,
                        tracker_resource_set_relation (metadata, "nmm:performer", performer);
                }
 
-               if ((tag = find_tag (format, audio_stream, "composer"))) {
+               if ((tag = find_tag (format, audio_stream, NULL, "composer"))) {
                        TrackerResource *composer = tracker_extract_new_artist (tag->value);
                        tracker_resource_set_relation (metadata, "nmm:composer", composer);
                        g_object_unref (composer);
@@ -212,7 +219,7 @@ tracker_extract_get_metadata (TrackerExtractInfo  *info,
                        int disc_number = 1;
                        TrackerResource *album_disc;
 
-                       if ((tag = find_tag (format, audio_stream, "disc"))) {
+                       if ((tag = find_tag (format, audio_stream, NULL, "disc"))) {
                                disc_number = atoi (tag->value);
                        }
 
@@ -235,23 +242,23 @@ tracker_extract_get_metadata (TrackerExtractInfo  *info,
                tracker_resource_set_int64 (metadata, "nfo:averageBitrate", format->bit_rate);
        }
 
-       if ((tag = av_dict_get (format->metadata, "comment", NULL, 0))) {
+       if ((tag = find_tag (format, audio_stream, video_stream, "comment"))) {
                tracker_resource_set_string (metadata, "nie:comment", tag->value);
        }
 
-       if ((tag = av_dict_get (format->metadata, "copyright", NULL, 0))) {
+       if ((tag = find_tag (format, audio_stream, video_stream, "copyright"))) {
                tracker_resource_set_string (metadata, "nie:copyright", tag->value);
        }
 
-       if ((tag = av_dict_get (format->metadata, "description", NULL, 0))) {
+       if ((tag = find_tag (format, audio_stream, video_stream, "description"))) {
                tracker_resource_set_string (metadata, "nie:description", tag->value);
        }
 
-       if ((tag = av_dict_get (format->metadata, "genre", NULL, 0))) {
+       if ((tag = find_tag (format, audio_stream, video_stream, "genre"))) {
                tracker_resource_set_string (metadata, "nfo:genre", tag->value);
        }
 
-       if ((tag = av_dict_get (format->metadata, "title", NULL, 0))) {
+       if ((tag = find_tag (format, audio_stream, video_stream, "title"))) {
                title = tag->value;
        }