土豆机的性能优化

[hooke007]

基于 7814d13

用一台土豆机测试的时候发现cpu被拉爆了

diff --git a/uosc_danmaku-main/modules/render.lua b/uosc_danmaku-main/modules/render.lua

--- a/uosc_danmaku-main/modules/render.lua
+++ b/uosc_danmaku-main/modules/render.lua
@@ -3,7 +3,7 @@ local msg = require('mp.msg')
 local utils = require("mp.utils")
 local unpack = unpack or table.unpack
 
-local INTERVAL = options.vf_fps and 0.01 or 0.001
+local INTERVAL = options.vf_fps and 0.01 or (1 / 60)
 local osd_width, osd_height, pause = 0, 0, true
 
 local overlay = mp.create_osd_overlay('ass-events')
@@ -61,9 +61,24 @@ function render()
     end
 
     local ass_events = {}
+    local adjusted_pos = pos - delay
+    local max_display = math.max(options.scrolltime, options.fixtime)
+
+    -- 跳过已结束的弹幕
+    local lo, hi = 1, #COMMENTS
+    while lo <= hi do
+        local mid = math.floor((lo + hi) / 2)
+        if COMMENTS[mid].start_time < adjusted_pos - max_display then
+            lo = mid + 1
+        else
+            hi = mid - 1
+        end
+    end
 
-    for _, event in ipairs(COMMENTS) do
-        if pos >= event.start_time + delay and pos <= event.end_time + delay then
+    for i = lo, #COMMENTS do
+        local event = COMMENTS[i]
+        if event.start_time > adjusted_pos then break end  -- 后续弹幕提前退出
+        if event.end_time >= adjusted_pos then
             local text = realtime_position_text(event, pos, height, delay)
             if text then
                 text = text:gsub("&#%d+;","")
@@ -170,20 +185,12 @@ end
 mp.observe_property('osd-width', 'number', function(_, value) osd_width = value or osd_width end)
 mp.observe_property('osd-height', 'number', function(_, value) osd_height = value or osd_height end)
 mp.observe_property('display-fps', 'number', function(_, value)
-    if value ~= nil then
-        local interval = 1 / value / 10
-        if interval > INTERVAL then
-            timer:kill()
-            timer = mp.add_periodic_timer(interval, render, true)
-            if ENABLED then
-                timer:resume()
-            end
-        else
-            timer:kill()
-            timer = mp.add_periodic_timer(INTERVAL, render, true)
-            if ENABLED then
-                timer:resume()
-            end
+    if value ~= nil and value > 0 then
+        local interval = options.vf_fps and INTERVAL or (1 / value)
+        timer:kill()
+        timer = mp.add_periodic_timer(interval, render, true)
+        if ENABLED and not pause and COMMENTS ~= nil then
+            timer:resume()
         end
     end
 end)

打完补丁之后勉强能看了

[Tony15246]

用二分查找跳过遍历确实能节省很多性能，帧率调整的逻辑我本地测试了一下也没有问题。请问大佬有兴趣贡献一下pr吗？

[hooke007]

Feel free to take away. 你测试下来没问题直接复制进去就行

这是我在尝试解决 #327 的副产物，osd_overlay 不如字幕可控，脚本的更新不是按照帧pts同步的，异步更新反而没有预期中的流畅，最后反而变成了需要 display-resample 硬控同步性与流畅性。

[Tony15246]

好的，感谢大佬