From 9ba0d656adb53cd1722bf98e470ca4940799c150 Mon Sep 17 00:00:00 2001
From: Jon Bergli Heier <snakebite@jvnv.net>
Date: Sat, 13 Aug 2011 12:44:12 +0200
Subject: Use a single thread for recoding.

---
 app.py       |  7 ++++---
 directory.py |  5 ++---
 recode.py    | 34 +++++++++++++++++++++++++++++++++-
 3 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/app.py b/app.py
index f288646..e70283c 100755
--- a/app.py
+++ b/app.py
@@ -61,11 +61,12 @@ class Application(object):
 	def json_recode(self, environ, start_response, path):
 		args = cgi.FieldStorage(environ = environ)
 		path = args.getvalue('path') if 'path' in args else None
-		decoder = args.getvalue('decoder') if 'decoder' in args else None
-		encoder = args.getvalue('encoder') if 'encoder' in args else None
 
 		f = File(path)
-		f.start_recode(decoder, encoder, environ['sessionid'])
+		# see json_play()
+		if not os.path.splitext(path)[1] in ('.mp3', '.ogg'):
+			decoder, encoder = ('ffmpeg',)*2
+			f.start_recode(decoder, encoder)
 
 		start_response('200 OK', [('Content-Type', 'text/plain')])
 		return []
diff --git a/directory.py b/directory.py
index 48dfaa9..6b8eaaf 100644
--- a/directory.py
+++ b/directory.py
@@ -1,4 +1,4 @@
-import os, mimetypes, recode, events, threading
+import os, mimetypes, recode, events
 
 from config import config
 
@@ -112,8 +112,7 @@ class File(DirectoryEntry):
 			events.event_pub.play(sessionid, '/cache/{0}'.format(self.path))
 
 	def start_recode(self, decoder, encoder, sessionid = None):
-		t = threading.Thread(target = self.recode, args = (decoder, encoder, sessionid))
-		t.start()
+		recode.RecodeThread.add((self.recode, decoder, encoder, sessionid))
 
 	def json(self):
 		cache_path = self.get_cache_path()
diff --git a/recode.py b/recode.py
index 5f5a623..6caa2a9 100644
--- a/recode.py
+++ b/recode.py
@@ -1,4 +1,4 @@
-import subprocess, tempfile
+import subprocess, tempfile, threading
 
 decoders = {}
 encoders = {}
@@ -63,6 +63,38 @@ class Recoder(object):
 			self.encoder.encode(temp.name, dest)
 			temp.close()
 
+class RecodeThread(threading.Thread):
+	lock = threading.Lock()
+	queue = []
+	running = False
+
+	def get_job(self):
+		return self.queue.pop(0) if len(self.queue) else None
+
+	def run(self):
+		self.lock.acquire()
+		job = self.get_job()
+		while job:
+			self.lock.release()
+
+			func, decoder, encoder, sessionid = job
+			func(decoder, encoder, sessionid)
+
+			self.lock.acquire()
+			job = self.get_job()
+
+		RecodeThread.running = False
+		self.lock.release()
+
+	@classmethod
+	def add(cls, job):
+		cls.lock.acquire()
+		cls.queue.append(job)
+		if not cls.running:
+			cls.running = True
+			RecodeThread().start()
+		cls.lock.release()
+
 if __name__ == '__main__':
 	import sys
 	ffmpeg = FFmpeg()
-- 
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