import os
import shlex
import signal
import subprocess

import lib.utils as utils
import lib.server as server

__all__ = ("TranscoderMencoder",)

class TranscoderMencoder(server.Transcoder):
    """Transcoder class that implements a transcoder using Mencoder"""
    mencoder_path = utils.which("mencoder")
    name = "mencoder"
    priority = -1
    args = {}
    proc = None

    def _setup_params(self):
        params_first = self.params_first

        # general_opts
        self.args["local"]    = params_first("local", False)
        self.args["language"] = params_first("language", False)
        self.args["subtitle"] = params_first("subtitle", False)
        self.args["format"]   = params_first("format", "")
        self.args["outfile"]  = params_first("outfile", "-")

        # input_opt
        uri = params_first("uri", "file://-").split("://")
        self.args["type"]     = uri[0]
        self.args["input"]    = uri[1]

        # audio_opts
        self.args["acodec"]   = params_first("acodec", "mp2")
        self.args["abitrate"] = params_first("abitrate", 192)
        self.args["volume"]   = params_first("volume", 5)

        # video_opts
        self.args["mux"]      = params_first("mux", "mpeg")
        self.args["fps"]      = params_first("fps", 25)
        self.args["vcodec"]   = params_first("vcodec", "mpeg1video")
        self.args["vbitrate"] = params_first("vbitrate", 400)
        self.args["width"]    = params_first("width", 320)
        self.args["height"]   = params_first("height", 240)
    # _setup_params()


    def _setup_audio(self):
        if self.args["acodec"] == "mp3lame":
            audio = "-oac mp3lame -lameopts cbr:br=%s vol=%s" % (
                self.args["abitrate"], self.args["volume"])
        else:
            audio = "-oac lavc -lavcopts acodec=%s:abitrate=%s" % (
                self.args["acodec"], self.args["abitrate"])

        return audio
    # _setup_audio()


    def _setup_video(self):
        video = " -of %s" % self.args["mux"]
        video += " -ofps %s" % self.args["fps"]

        vcodec = self.args["vcodec"]
        if vcodec == "nuv" or vcodec == "xvid"\
               or vcodec == "qtvideo" or vcodec == "copy":
            video += " -ovc %s" % vcodec
        else:
            video += " -ovc lavc -lavcopts vcodec=%s:vbitrate=%s" % (
                vcodec, self.args["vbitrate"])

        video += " %s" % self.args["format"]
        video += " -vf scale=%s:%s" % (self.args["width"], self.args["height"])

        return video
    # _setup_video()


    def _arg_append(self, args, options):
        for arg in shlex.split(options):
            args.append(arg)
    # arg_append()

    def _setup_mencoder_opts(self, args):
        args.append(self.mencoder_path)
        args.append(self.args["input"])

        if self.args["language"]:
            self._arg_append(args, "-alang %s" % self.args["language"])

        if self.args["subtitle"]:
            self._arg_append(args, "-slang %s" % self.args["subtitle"])
            self._arg_append(args, "-subfps %s" % self.args["fps"])

        self._arg_append(args, "-idx")
        self._arg_append(args, self._setup_audio())
        self._arg_append(args, self._setup_video())

        self._arg_append(args, "-really-quiet")
        self._arg_append(args, "-o %s" % self.args["outfile"])
        self._arg_append(args, "2> %s" % os.devnull)
    # _setup_args()


    def _setup_filename(self):
        _type = self.args["type"]

        if _type == "file":
            if not os.path.exists(self.args["input"]):
                raise IOError,\
                      "File requested does not exist: %s." % self.args["input"]

        elif _type == "dvd":
            self.args["input"] = "dvd://".join(self.args["input"])
    # _setup_filename()


    def __init__(self, params):
        server.Transcoder.__init__(self, params)
        self.mencoder_opts = []

        try:
            self._setup_params()
            self._setup_filename()
            self._setup_mencoder_opts(self.mencoder_opts)
        except Exception, e:
            self.log.error(e)
    # __init__()


    def start(self, outfd):
        cmd = " ".join(self.mencoder_opts)
        self.log.debug("Mencoder: %s" % cmd)

        try:
            self.proc = subprocess.Popen(self.mencoder_opts, stdout=subprocess.PIPE, close_fds=True)
        except Exception, e:
            self.log.error("Error executing mencoder: %s" % e)
            return False

        try:
            while self.proc and self.proc.poll() == None:
                d = self.proc.stdout.read(1024)
                outfd.write(d)
        except Exception, e:
            self.log.error("Problems handling data: %s" % e)
            return False

        return True
    # start()


    def stop(self):
        if self.proc:
            try:
                os.kill(self.proc.pid, signal.SIGTERM)
            except OSError, e:
                pass

            try:
                self.proc.wait()
            except Exception, e:
                pass

            self.proc = None
    # stop()

# TranscoderMencoder