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authorTaco Hoekwater <taco@elvenkind.com>2011-06-01 08:54:21 +0000
committerTaco Hoekwater <taco@elvenkind.com>2011-06-01 08:54:21 +0000
commitd7ccb42582f85acf30568913610ccf4d602023fb (patch)
tree7292e3545a420676878e7451b68892d360c62cb6 /Master/texmf-dist/scripts/context/lua/mtx-flac.lua
parent2d62a6fe9b80def59c392268022f1f9a2d6e358f (diff)
commit context 2011.05.18
git-svn-id: svn://tug.org/texlive/trunk@22719 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/scripts/context/lua/mtx-flac.lua')
-rw-r--r--Master/texmf-dist/scripts/context/lua/mtx-flac.lua216
1 files changed, 216 insertions, 0 deletions
diff --git a/Master/texmf-dist/scripts/context/lua/mtx-flac.lua b/Master/texmf-dist/scripts/context/lua/mtx-flac.lua
new file mode 100644
index 00000000000..37f985654a3
--- /dev/null
+++ b/Master/texmf-dist/scripts/context/lua/mtx-flac.lua
@@ -0,0 +1,216 @@
+if not modules then modules = { } end modules ['mtx-flac'] = {
+ version = 1.001,
+ comment = "companion to mtxrun.lua",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- Written with Within Temptation's "The Unforgiven" in loopmode on
+-- the speakers. The following code is also used for my occasional music
+-- repository cleanup session using the code below.
+
+-- this can become l-flac.lua
+
+local sub, match, byte, lower = string.sub, string.match, string.byte, string.lower
+local readstring, readnumber = io.readstring, io.readnumber
+local concat = table.concat
+local tonumber = tonumber
+local tobitstring = number.tobitstring
+
+flac = flac or { }
+
+flac.report = string.format
+
+local splitter = lpeg.splitat("=")
+local readers = { }
+
+readers[0] = function(f,size,target) -- not yet ok
+ local info = { }
+ target.info = info
+ info.minimum_block_size = readnumber(f,-2)
+ info.maximum_block_size = readnumber(f,-2)
+ info.minimum_frame_size = readnumber(f,-3)
+ info.maximum_frame_size = readnumber(f,-3)
+ local buffer = { }
+ for i=1,8 do
+ buffer[i] = tobitstring(readnumber(f,1))
+ end
+ local bytes = concat(buffer)
+ info.sample_rate_in_hz = tonumber(sub(bytes, 1,20),2) -- 20
+ info.number_of_channels = tonumber(sub(bytes,21,23),2) -- 3
+ info.bits_per_sample = tonumber(sub(bytes,24,28),2) -- 5
+ info.samples_in_stream = tonumber(sub(bytes,29,64),2) -- 36
+ info.md5_signature = readstring(f,16) -- 128
+end
+
+readers[4] = function(f,size,target,banner)
+ local tags = { }
+ target.tags = tags
+ target.vendor = readstring(f,readnumber(f,-4))
+ for i=1,readnumber(f,-4) do
+ local key, value = lpeg.match(splitter,readstring(f,readnumber(f,-4)))
+ tags[lower(key)] = value
+ end
+end
+
+readers.default = function(f,size,target)
+ f:seek("cur",size)
+end
+
+function flac.getmetadata(filename)
+ local f = io.open(filename, "rb")
+ if f then
+ local banner = readstring(f,4)
+ if banner == "fLaC" then
+ local data = {
+ banner = banner,
+ filename = filename,
+ filesize = lfs.attributes(filename,"size"),
+ }
+ while true do
+ local flag = readnumber(f,1)
+ local size = readnumber(f,3)
+ local last = flag > 127
+ if last then
+ flag = flag - 128
+ end
+ local reader = readers[flag] or readers.default
+ reader(f,size,data,banner)
+ if last then
+ return data
+ end
+ end
+ else
+ flac.report("no flac file: %s (%s)",filename,banner)
+ end
+ f:close()
+ else
+ flac.report("no file: %s",filename)
+ end
+end
+
+function flac.savecollection(pattern,filename)
+ pattern = (pattern ~= "" and pattern) or "**/*.flac"
+ filename = (filename ~= "" and filename) or "music-collection.xml"
+ flac.report("identifying files using pattern %q" ,pattern)
+ local files = dir.glob(pattern)
+ flac.report("%s files found, analyzing files",#files)
+ local music = { }
+ for i=1,#files do
+ local data = flac.getmetadata(files[i])
+ if data then
+ local tags = data.tags
+ local info = data.info
+ local artist = tags.artist
+ local album = tags.album
+ local albums = music[artist]
+ if not albums then
+ albums = { }
+ music[artist] = albums
+ end
+ local albumx = albums[album]
+ if not albumx then
+ albumx = {
+ year = tags.date,
+ tracks = { },
+ }
+ albums[album] = albumx
+ end
+ albumx.tracks[tonumber(tags.tracknumber) or 0] = {
+ title = tags.title,
+ length = math.round((info.samples_in_stream/info.sample_rate_in_hz)),
+ }
+ end
+ end
+ -- inspect(music)
+ local nofartists, nofalbums, noftracks, noferrors = 0, 0, 0, 0
+ local f = io.open(filename,"wb")
+ if f then
+ f:write("<?xml version='1.0' standalone='yes'?>\n\n")
+ f:write("<collection>\n")
+ for artist, albums in table.sortedpairs(music) do
+ nofartists = nofartists + 1
+ f:write("\t<artist>\n")
+ f:write("\t\t<name>" .. artist .. "</name>\n")
+ f:write("\t\t<albums>\n")
+ for album, data in table.sortedpairs(albums) do
+ nofalbums = nofalbums + 1
+ f:write("\t\t\t<album year='" .. (data.year or 0) .. "'>\n")
+ f:write("\t\t\t\t<name>" .. album .. "</name>\n")
+ f:write("\t\t\t\t<tracks>\n")
+ local tracks = data.tracks
+ for i=1,#tracks do
+ local track = tracks[i]
+ if track then
+ noftracks = noftracks + 1
+ f:write("\t\t\t\t\t<track length='" .. track.length .. "'>" .. track.title .. "</track>\n")
+ else
+ noferrors = noferrors + 1
+ flac.report("error in album: %q of artist",album,artist)
+ f:write("\t\t\t\t\t<error track='" .. i .. "'/>\n")
+ end
+ end
+ f:write("\t\t\t\t</tracks>\n")
+ f:write("\t\t\t</album>\n")
+ end
+ f:write("\t\t</albums>\n")
+ f:write("\t</artist>\n")
+ end
+ f:write("</collection>\n")
+ end
+ f:close()
+ flac.report("%s tracks of %s albums of %s artists saved in %q (%s errors)",noftracks,nofalbums,nofartists,filename,noferrors)
+end
+
+--
+
+local helpinfo = [[
+--collect collect albums in xml file
+
+example:
+
+mtxrun --script flac --collect somename.flac
+mtxrun --script flac --collect --pattern="m:/music/**")
+]]
+
+local application = logs.application {
+ name = "mtx-flac",
+ banner = "ConTeXt Flac Helpers 0.10",
+ helpinfo = helpinfo,
+}
+
+flac.report = application.report
+
+-- script code
+
+scripts = scripts or { }
+scripts.flac = scripts.flac or { }
+
+function scripts.flac.collect()
+ local files = environment.files
+ local pattern = environment.arguments.pattern
+ if #files > 0 then
+ for i=1,#files do
+ local filename = files[1]
+ if file.suffix(filename) == "flac" then
+ flac.savecollection(filename,file.replacesuffix(filename,"xml"))
+ elseif lfs.isdir(filename) then
+ local pattern = filename .. "/**.flac"
+ flac.savecollection(pattern,file.addsuffix(file.basename(filename),"xml"))
+ else
+ flac.savecollection(file.replacesuffix(filename,"flac"),file.replacesuffix(filename,"xml"))
+ end
+ end
+ elseif pattern then
+ flac.savecollection(file.addsuffix(pattern,"flac"),"music-collection.xml")
+ else
+ flac.report("no file(s) or pattern given" )
+ end
+end
+
+if environment.argument("collect") then
+ scripts.flac.collect()
+else
+ application.help()
+end