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Diffstat (limited to 'audio-clipper.lua')
| -rw-r--r-- | audio-clipper.lua | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/audio-clipper.lua b/audio-clipper.lua new file mode 100644 index 0000000..ed97c14 --- /dev/null +++ b/audio-clipper.lua @@ -0,0 +1,122 @@ +script_name = "Audio Clipper" +script_description = "Extracts audio from the selected line(s).\nNeeds ffmpeg." +script_author = "garret" +script_version = "2021-04-04" + +a = aegisub +ok = {"OK"}, {close = "OK"} -- just an "OK" button, for error messages. + +function get_vid_dir() + local dir = a.decode_path("?video") + if dir == "?video" then -- if there is not, in fact, a video + return nil + else + return dir + end +end + +function get_vid() + local vid = a.project_properties().video_file + if vid == "" then + return nil + else + return vid + end +end + +function get_format(copy, format, custom) + if copy == true then -- if we do want to copy + if format == "" then -- format is the thing from the dropdown + a.dialog.display({{class = "label", label = "Need a format!"}}, ok) + a.cancel() + elseif format == "AAC" then -- these are the most common audio formats i've seen + return "m4a" + elseif format == "Opus" then + return "opus" + elseif format == "FLAC" then + return "flac" elseif format == "Custom" then -- but I am not all-knowing, so you can put your own + return custom + end + else -- if we don't want to copy (i.e. we've pressed "Just make it FLAC") + return "flac" + end +end + +function make_out_path(out_path) + if out_path == "" then + a.dialog.display({{class = "label", label = "Need an output path!"}}, ok) + a.cancel() + end + os.execute('mkdir "'..out_path..'"') -- if it doesn't exist, it makes it, and if it does, it errors. + return out_path -- either way, the path now exists. (probably) +end -- I imagine there's a mkdir thing in lua that's better, but this works fine, so unless it breaks, i'll keep it like this. + +function extract_audio(in_path, start_time, end_time, out_path, name, extension, copy) + if copy == true then + os.execute('ffmpeg -i "'..in_path..'" -codec copy -vn -ss '..start_time..'ms -to '..end_time..'ms "'..out_path..name..'.'..extension..'" -y') + -- takes the video as input, copies the streams, but doesn't include video. sets it to start at the start of the selection, and end at the end of it. outputs to our chosen out path with our chosen name and extension. overwrites anything with the same name. + else + os.execute('ffmpeg -i "'..in_path..'" -vn -ss '..start_time..'ms -to '..end_time..'ms "'..out_path..name..'.'..extension..'" -y') + -- same as above, but doesn't copy the stream (transcodes to flac) + end +end + +function loop(subs, sel, in_path, out_path, extension, copy, delay) + a.progress.title("Extracting Audio") + local progress = 0 + local progress_increment = 100 / #sel -- increment by this for every line, and the bar will eventually reach 100 + for x, i in ipairs(sel) do -- x is the position of the line in our selection, i is the position in the whole sub file + if a.progress.is_cancelled() then -- if you press the cancel button + a.cancel() -- it stops (mind-blowing, i know) + end + a.progress.set(progress) + local line = subs[i] + local start_time = line.start_time + delay + local end_time = line.end_time + delay + a.progress.task("Extracting line "..x) + extract_audio(in_path, start_time, end_time, out_path, x, extension, copy) + progress = progress + progress_increment + end + a.progress.set(100) -- in case it didn't reach 100 on its own +end + + +function gui(subs, sel) + local in_path = get_vid() + local out_path = get_vid_dir() + if in_path == nil or out_path == nil then -- if no video is loaded + in_path = "No video loaded. Specify a path." + out_path = in_path -- both the same error message + else + out_path = out_path.."/audioclipper_output/" -- make the out path the one we actually want + end + + local get_input={{class="label",x=0,y=0,label="Video's audio format:"},{class="dropdown",name="format",x=0,y=1,width=2,height=1,items={"AAC","Opus","FLAC","Custom"},value="Audio Format",hint="If you don't know, you should probably press \"Just make it FLAC\""},{class="label",x=0,y=2,label="Custom Extension:"},{class="edit",name="custom",x=1,y=2,value="mka",hint="You'll probably be fine with mka, because matroska can contain pretty much anything"},{class="label",x=0,y=3,label="Delay (ms):"},{class="intedit",name="delay",x=1,y=3,value=0,hint="to prevent timing fuckery with weird raws"},{class="label",x=0,y=4,label="Input path:"},{class="edit",name="in_path",x=0,y=5,width=2,height=1,value=in_path,hint="where the audio comes from"},{class="label",x=0,y=6,label="Output path (will be created if it doesn't already exist):"},{class="edit",name="out_path",x=0,y=7,width=2,height=1,value=out_path,hint="where the audio goes"}} + local pressed, results = a.dialog.display(get_input, {"Cancel", "OK", "Just make it FLAC"}) + -- there's probably something that can detect the format automatically, but I do not know what it is. + if pressed == "Cancel" then + a.cancel() + elseif pressed == "OK" then + local do_copy = true + elseif pressed == "Just make it FLAC" then + local do_copy = false + end + local extension = get_format(do_copy, results.format, results.custom) -- gets file extension + local delay = results.delay + in_path = results.in_path + out_path = make_out_path(results.out_path) + loop(subs, sel, in_path, out_path, extension, copy, delay) +end + +function non_gui(subs, sel) -- no gui, so you can bind it to a hotkey + local vid = get_vid() + if vid == nil then + a.dialog.display({{class = "label", label = "Need a video!\nSpecify one in the GUI, or load one in aegisub."}}, ok) + else + loop(subs, sel, get_vid(), make_out_path(get_vid_dir().."/audioclipper_output/"), 'flac', false, 0) + end + -- sets sane defaults (takes the audio from the video file, and outputs to /the/video/dir/audioclipper_output/. transcodes to flac. no delay) +end + +a.register_macro(script_name, script_description, gui) +a.register_macro(": Non-GUI macros :/"..script_name..": Just make it FLAC", script_description, non_gui) -- same section as unanimated's scripts |