mp4: support the writer/composer tag

I tried to search for a certain composer in my collection, but only non-mp4 files showed up. The source code reveals that this tag is not read. This can be fixed by reading the 'Writer' tag field, in mp4_plugin.c, in function mp4_load_tag. I actually tried this, and after compiling with those lines added, also mp4 (.m4a) files showed up when searching for a composer.

mp4: support the writer/composer tag
a51fada1 · Frank Mulder · Max Kellermann · 702d6a64 · a51fada1
Commit a51fada1 authored Dec 29, 2008 by Frank Mulder Committed by Max Kellermann Dec 29, 2008
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mp4_plugin.c src/decoder/mp4_plugin.c +2 -0

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--- a/src/decoder/mp4_plugin.c
+++ b/src/decoder/mp4_plugin.c
@@ -387,6 +387,8 @@ mp4_load_tag(const char *file)
 			tag_add_item(ret, TAG_ITEM_GENRE, value);
 		} else if (0 == strcasecmp("date", item)) {
 			tag_add_item(ret, TAG_ITEM_DATE, value);
+		} else if (0 == strcasecmp("writer", item)) {
+			tag_add_item(ret, TAG_ITEM_COMPOSER, value);
 		}
 		free(item);