player: use XDG_CACHE_HOME by default

This adds cache as a possible path for mpv to internally pick
(~/.cache/mpv for non-darwin unix-like systems, the usual config
directory for everyone else). For gpu shader cache and icc cache,
controlling whether or not to write such files is done with the new
--gpu-shader-cache and --icc-cache options respectively. Additionally,
--cache-on-disk no longer requires explicitly setting the --cache-dir
option. The old options, --cache-dir, --gpu-shader-cache-dir, and
--icc-cache-dir simply set an override for the directory to save cache
files. If unset, then the cache is saved in XDG_CACHE_HOME.

1 files changed, 5 insertions, 3 deletions

diff --git a/demux/cache.c b/demux/cache.c
index f48598807c..08ac193cdf 100644
--- a/demux/cache.c
+++ b/demux/cache.c
@@ -100,10 +100,12 @@ struct demux_cache *demux_cache_create(struct mpv_global *global,
     cache->fd = -1;
 
     char *cache_dir = cache->opts->cache_dir;
-    if (!(cache_dir && cache_dir[0])) {
-        MP_ERR(cache, "No cache data directory supplied.\n");
-        goto fail;
+    if (cache_dir && cache_dir[0]) {
+        cache_dir = mp_get_user_path(NULL, global, cache_dir);
+    } else {
+        cache_dir = mp_find_user_file(NULL, global, "cache", "");
     }
+    mp_mkdirp(cache_dir);
 
     cache->filename = mp_path_join(cache, cache_dir, "mpv-cache-XXXXXX.dat");
     cache->fd = mp_mkostemps(cache->filename, 4, O_CLOEXEC);