add pause_cache

pause_cache.patch

@@ -0,0 +1,37 @@
+diff -ruN mpvacious/main.lua mpvacious-patched/main.lua
+--- mpvacious/main.lua	2024-07-22 15:31:00.090132616 -0400
++++ mpvacious-patched/main.lua	2024-07-24 17:51:37.378938337 -0400
+@@ -1 +1,3 @@
++require("utils.force-japanese")
+ require('subs2srs')
+diff -ruN mpvacious/utils/pause_cache.lua mpvacious-patched/utils/pause_cache.lua
+--- mpvacious/utils/pause_cache.lua	1969-12-31 20:00:00.000000000 -0400
++++ mpvacious-patched/utils/pause_cache.lua	2024-07-24 17:51:16.124344874 -0400
+@@ -0,0 +1,27 @@
++function on_load()
++    -- Get the system's total memory in MB
++    local mem_total = tonumber(io.popen("free -m | awk '/Mem:/ {print $2}'"):read())
++
++    -- Calculate the cache size based on total memory
++    local cache_size = math.floor(mem_total / 32) -- 128MB for 4GB RAM, increase proportionally
++
++    -- Set the cache size and enable caching
++    mp.set_property_number("cache", cache_size)
++    mp.set_property("demuxer-max-bytes", tostring(cache_size * 1024 * 1024))  -- Set cache size in bytes
++    mp.set_property("demuxer-readahead-secs", "20")  -- Set read-ahead in seconds, adjust as needed
++end
++
++function on_pause_change(name, value)
++    if value == true then
++        -- When paused, reduce backward cache
++        mp.set_property("demuxer-back-bytes", "0")
++    else
++        -- When unpaused, reset backward cache
++        local mem_total = tonumber(io.popen("free -m | awk '/Mem:/ {print $2}'"):read())
++        local cache_size = math.floor(mem_total / 32)
++        mp.set_property("demuxer-back-bytes", tostring(cache_size * 1024 * 1024))
++    end
++end
++
++mp.register_event("file-loaded", on_load)
++mp.observe_property("pause", "bool", on_pause_change)