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261 lines
7.2 KiB
261 lines
7.2 KiB
-- use xrandr command to set output to best fitting fps rate
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-- when playing videos with mpv.
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utils = require 'mp.utils'
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xrandr_blacklist = {}
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function xrandr_parse_blacklist()
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-- Parse the optional "blacklist" from a string into an array for later use.
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-- For now, we only support a list of rates, since the "mode" is not subject
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-- to automatic change (mpv is better at scaling than most displays) and
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-- this also makes the blacklist option more easy to specify:
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local b = mp.get_opt("xrandr-blacklist")
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if (b == nil) then
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return
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end
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local i = 1
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for s in string.gmatch(b, "([^, ]+)") do
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xrandr_blacklist[i] = 0.0 + s
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i = i+1
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end
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end
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xrandr_parse_blacklist()
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function xrandr_check_blacklist(mode, rate)
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-- check if (mode, rate) is black-listed - e.g. because the
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-- computer display output is known to be incompatible with the
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-- display at this specific mode/rate
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for i=1,#xrandr_blacklist do
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r = xrandr_blacklist[i]
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if (r == rate) then
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mp.msg.log("info", "will not use mode '" .. mode .. "' with rate " .. rate .. " because option -script-opts=xrandr-blacklist said so")
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return true
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end
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end
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return false
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end
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xrandr_detect_done = false
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xrandr_modes = {}
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xrandr_connected_outputs = {}
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function xrandr_detect_available_rates()
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if (xrandr_detect_done) then
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return
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end
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xrandr_detect_done = true
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-- invoke xrandr to find out which fps rates are available on which outputs
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local p = {}
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p["cancellable"] = false
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p["args"] = {}
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p["args"][1] = "xrandr"
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p["args"][2] = "-q"
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local res = utils.subprocess(p)
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if (res["error"] ~= nil) then
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mp.msg.log("info", "failed to execute 'xrand -q', error message: " .. res["error"])
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return
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end
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mp.msg.log("v","xrandr -q\n" .. res["stdout"])
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local output_idx = 1
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for output in string.gmatch(res["stdout"], '\n([^ ]+) connected') do
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table.insert(xrandr_connected_outputs, output)
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-- the first line with a "*" after the match contains the mode associated with the mode
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local mls = string.match(res["stdout"], "\n" .. string.gsub(output, "%p", "%%%1") .. " connected.*")
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local r
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local mode
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mode, r = string.match(mls, '\n ([0-9x]+) ([^*\n]*%*[^\n]*)')
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if (r == nil) then
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-- if no refresh rate is reported active for an output by xrandr,
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-- search for the mode that is "recommended" (marked by "+" in xrandr's output)
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mode, r = string.match(mls, '\n ([0-9x]+) ([^+\n]*%+[^\n]*)')
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end
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mp.msg.log("info", "output " .. output .. " mode=" .. mode .. " refresh rates = " .. r)
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xrandr_modes[output] = { mode = mode, rates_s = r, rates = {} }
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local i = 1
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for s in string.gmatch(r, "([^ +*]+)") do
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-- check if rate "r" is black-listed - this is checked here because
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if (not xrandr_check_blacklist(mode, 0.0 + s)) then
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xrandr_modes[output].rates[i] = 0.0 + s
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i = i+1
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end
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end
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output_idx = output_idx + 1
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end
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end
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function xrandr_find_best_fitting_rate(fps, output)
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local xrandr_rates = xrandr_modes[output].rates
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-- try integer multipliers of 1 to 3, in that order
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for m=1,3 do
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-- check for a "perfect" match (where fps rates of e.g. 60.0 are not equal 59.9 or such)
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for i=1,#xrandr_rates do
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r = xrandr_rates[i]
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if (math.abs(r-(m * fps)) < 0.001) then
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return r
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end
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end
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end
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for m=1,3 do
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-- check for a "less precise" match (where fps rates of e.g. 60.0 and 59.9 are assumed "equal")
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for i=1,#xrandr_rates do
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r = xrandr_rates[i]
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if (math.abs(r-(m * fps)) < 0.2) then
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if (m == 1) then
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-- pass the original rate to xrandr later, because
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-- e.g. a 23.976 Hz mode might be displayed as "24.0",
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-- but still xrandr may set the better matching mode
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-- if the exact number is passed
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return fps
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else
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return r
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end
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end
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end
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end
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-- if no known frame rate is any "good", use the highest available frame rate,
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-- as this will probably cause the least "jitter"
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local mr = 0.0
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for i=1,#xrandr_rates do
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r = xrandr_rates[i]
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-- mp.msg.log("v","r=" .. r .. " mr=" .. mr)
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if (r > mr) then
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mr = r
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end
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end
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return mr
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end
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xrandr_active_outputs = {}
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function xrandr_set_active_outputs()
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local dn = mp.get_property("display-names")
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if (dn ~= nil) then
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mp.msg.log("v","display-names=" .. dn)
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xrandr_active_outputs = {}
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for w in (dn .. ","):gmatch("([^,]*),") do
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table.insert(xrandr_active_outputs, w)
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end
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end
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end
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-- last detected non-nil video frame rate:
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xrandr_cfps = nil
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-- for each output, we remember which refresh rate we set last, so
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-- we do not unnecessarily set the same refresh rate again
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xrandr_previously_set = {}
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function xrandr_set_rate()
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local f = mp.get_property_native("fps")
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if (f == nil or f == xrandr_cfps) then
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-- either no change or no frame rate information, so don't set anything
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return
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end
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xrandr_cfps = f
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xrandr_detect_available_rates()
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xrandr_set_active_outputs()
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local vdpau_hack = false
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local old_vid = nil
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local old_position = nil
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if (mp.get_property("options/vo") == "vdpau") then
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-- enable wild hack: need to close and re-open video for vdpau,
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-- because vdpau barfs if xrandr is run while it is in use
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vdpau_hack = true
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old_position = mp.get_property("time-pos")
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old_vid = mp.get_property("vid")
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mp.set_property("vid", "no")
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end
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local outs = {}
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if (#xrandr_active_outputs == 0) then
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-- No active outputs - probably because vo (like with vdpau) does
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-- not provide the information which outputs are covered.
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-- As a fall-back, let's assume all connected outputs are relevant.
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mp.msg.log("v","no output is known to be used by mpv, assuming all connected outputs are used.")
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outs = xrandr_connected_outputs
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else
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outs = xrandr_active_outputs
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end
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-- iterate over all relevant outputs used by mpv's output:
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for n, output in ipairs(outs) do
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local bfr = xrandr_find_best_fitting_rate(xrandr_cfps, output)
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if (bfr == 0.0) then
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mp.msg.log("info", "no non-blacklisted rate available, not invoking xrandr")
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else
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mp.msg.log("info", "container fps is " .. xrandr_cfps .. "Hz, for output " .. output .. " mode " .. xrandr_modes[output].mode .. " the best fitting display fps rate is " .. bfr .. "Hz")
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if (bfr == xrandr_previously_set[output]) then
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mp.msg.log("v", "output " .. output .. " was already set to " .. bfr .. "Hz before - not changing")
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else
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-- invoke xrandr to set the best fitting refresh rate for output
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local p = {}
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p["cancellable"] = false
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p["args"] = {}
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p["args"][1] = "xrandr"
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p["args"][2] = "--output"
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p["args"][3] = output
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p["args"][4] = "--mode"
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p["args"][5] = xrandr_modes[output].mode
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p["args"][6] = "--rate"
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p["args"][7] = bfr
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local res = utils.subprocess(p)
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if (res["error"] ~= nil) then
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mp.msg.log("error", "failed to set refresh rate for output " .. output .. " using xrandr, error message: " .. res["error"])
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else
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xrandr_previously_set[output] = bfr
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end
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end
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end
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end
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if (vdpau_hack) then
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mp.set_property("vid", old_vid)
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mp.commandv("seek", old_position, "absolute", "keyframes")
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end
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end
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-- we'll consider setting refresh rates whenever the video fps or the active outputs change:
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mp.observe_property("fps", "native", xrandr_set_rate)
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mp.observe_property("display-names", "native", xrandr_set_rate)
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