refactor: use demuxer-cache-state/cache-duration property (tomasklaen…

…#889)

It's used by both osc.lua and stats.lua and gives a more accurate
estimation of how much media is cached.

src/uosc/elements/Timeline.lua

@@ -251,15 +251,11 @@ function Timeline:render()
 	ass:rect(fax, fay, fbx, fby, {opacity = config.opacity.position})
 
 	-- Uncached ranges
-	local buffered_playtime = nil
 	if state.uncached_ranges then
 		local opts = {size = 80, anchor_y = fby}
 		local texture_char = visibility > 0 and 'b' or 'a'
 		local offset = opts.size / (visibility > 0 and 24 or 28)
 		for _, range in ipairs(state.uncached_ranges) do
-			if not buffered_playtime and (range[1] > state.time or range[2] > state.time) then
-				buffered_playtime = (range[1] - state.time) / state.speed
-			end
 			if options.timeline_cache then
 				local ax = range[1] < 0.5 and bax or math.floor(t2x(range[1]))
 				local bx = range[2] > state.duration - 0.5 and bbx or math.ceil(t2x(range[2]))
@@ -377,14 +373,14 @@ function Timeline:render()
 	if text_opacity > 0 then
 		local time_opts = {size = self.font_size, opacity = text_opacity, border = 2 * state.scale}
 		-- Upcoming cache time
-		if buffered_playtime and options.buffered_time_threshold > 0
-			and buffered_playtime < options.buffered_time_threshold then
+		if state.cache_duration and options.buffered_time_threshold > 0
+			and state.cache_duration < options.buffered_time_threshold then
 			local margin = 5 * state.scale
 			local x, align = fbx + margin, 4
 			local cache_opts = {
 				size = self.font_size * 0.8, opacity = text_opacity * 0.6, border = options.text_border * state.scale,
 			}
-			local human = round(math.max(buffered_playtime, 0)) .. 's'
+			local human = round(state.cache_duration) .. 's'
 			local width = text_width(human, cache_opts)
 			local time_width = timestamp_width(state.time_human, time_opts)
 			local time_width_end = timestamp_width(state.destination_time_human, time_opts)

src/uosc/main.lua

@@ -373,6 +373,7 @@ state = {
 	cache = nil,
 	cache_buffering = 100,
 	cache_underrun = false,
+	cache_duration = nil,
 	core_idle = false,
 	eof_reached = false,
 	render_delay = config.render_delay,
@@ -766,13 +767,15 @@ mp.observe_property('demuxer-cache-state', 'native', function(prop, cache_state)
 	if cache_state then
 		cached_ranges, bof, eof = cache_state['seekable-ranges'], cache_state['bof-cached'], cache_state['eof-cached']
 		set_state('cache_underrun', cache_state['underrun'])
+		set_state('cache_duration', not cache_state.eof and cache_state['cache-duration'] or nil)
 	else
 		cached_ranges = {}
 	end
 
 	if not (state.duration and (#cached_ranges > 0 or state.cache == 'yes' or
 			(state.cache == 'auto' and state.is_stream))) then
 		if state.uncached_ranges then set_state('uncached_ranges', nil) end
+		set_state('cache_duration', nil)
 		return
 	end