From 8048374a5c1eb3af80aa057dcfd20deed39447c8 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Mon, 29 Dec 2014 22:51:18 +0100
Subject: player: filter tags, add --display-tags option

This attempts to increase user-friendliness by excluding useless tags.
It should be especially helpful with mp4 files, because the FFmpeg mp4
demuxer adds tons of completely useless information to the metadata.

Fixes #1403.
---
 common/tags.c | 19 +++++++++++++++++++
 common/tags.h |  1 +
 2 files changed, 20 insertions(+)

(limited to 'common')

diff --git a/common/tags.c b/common/tags.c
index bc9d98ea2f..c38d002243 100644
--- a/common/tags.c
+++ b/common/tags.c
@@ -74,6 +74,25 @@ struct mp_tags *mp_tags_dup(void *tparent, struct mp_tags *tags)
     return new;
 }
 
+// Return a copy of the tags, but containing only keys in list. Also forces
+// the order and casing of the keys (for cosmetic reasons).
+// The special key "all" matches all keys.
+struct mp_tags *mp_tags_filtered(void *tparent, struct mp_tags *tags, char **list)
+{
+    struct mp_tags *new = talloc_zero(tparent, struct mp_tags);
+    for (int n = 0; list && list[n]; n++) {
+        char *key = list[n];
+        if (strcasecmp(key, "all") == 0) {
+            talloc_free(new);
+            return mp_tags_dup(tparent, tags);
+        }
+        char *value = mp_tags_get_str(tags, key);
+        if (value)
+            mp_tags_set_str(new, key, value);
+    }
+    return new;
+}
+
 void mp_tags_merge(struct mp_tags *tags, struct mp_tags *src)
 {
     for (int n = 0; n < src->num_keys; n++)
diff --git a/common/tags.h b/common/tags.h
index b6db5f3df2..dc8539d98f 100644
--- a/common/tags.h
+++ b/common/tags.h
@@ -15,6 +15,7 @@ char *mp_tags_get_str(struct mp_tags *tags, const char *key);
 char *mp_tags_get_bstr(struct mp_tags *tags, bstr key);
 void mp_tags_clear(struct mp_tags *tags);
 struct mp_tags *mp_tags_dup(void *tparent, struct mp_tags *tags);
+struct mp_tags *mp_tags_filtered(void *tparent, struct mp_tags *tags, char **list);
 void mp_tags_merge(struct mp_tags *tags, struct mp_tags *src);
 struct AVDictionary;
 void mp_tags_copy_from_av_dictionary(struct mp_tags *tags,
-- 
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