<commit_before>import gobject
gobject.threads_init()

import pygst
pygst.require('0.10')
import gst

import logging
import threading

from mopidy.process import BaseProcess, unpickle_connection

logger = logging.getLogger('mopidy.outputs.gstreamer')

class GStreamerOutput(object):
    """
    Audio output through GStreamer.

    Starts the :class:`GStreamerProcess`.
    """

    def __init__(self, core_queue, output_queue):
        self.process = GStreamerProcess(core_queue, output_queue)
        self.process.start()

    def destroy(self):
        self.process.terminate()

class GStreamerMessagesThread(threading.Thread):
    def run(self):
        gobject.MainLoop().run()

class GStreamerProcess(BaseProcess):
    """
    A process for all work related to GStreamer.

    The main loop processes events from both Mopidy and GStreamer.

    Make sure this subprocess is started by the MainThread in the top-most
    parent process, and not some other thread. If not, we can get into the
    problems described at
    http://jameswestby.net/weblog/tech/14-caution-python-multiprocessing-and-glib-dont-mix.html.
    """

    def __init__(self, core_queue, output_queue):
        super(GStreamerProcess, self).__init__()
        self.core_queue = core_queue
        self.output_queue = output_queue
        self.gst_pipeline = None

    def run_inside_try(self):
        self.setup()
        while True:
            message = self.output_queue.get()
            self.process_mopidy_message(message)

    def setup(self):
        logger.debug(u'Setting up GStreamer pipeline')

        # Start a helper thread that can run the gobject.MainLoop
        messages_thread = GStreamerMessagesThread()
        messages_thread.daemon = True
        messages_thread.start()

        self.gst_pipeline = gst.parse_launch(' ! '.join([
            'multiqueue name=queue',
            'volume name=volume',
            'alsasink'
        ]))

        decode_bin = gst.element_factory_make('uridecodebin', 'uri')
        decode_bin.connect('pad-added', self.process_new_pad)
        app_src = gst.element_factory_make('appsrc', 'src')
        queue = self.gst_pipeline.get_by_name('queue')

        self.gst_pipeline.add(decode_bin)
        self.gst_pipeline.add(app_src)

        self.gst_uri_pad = queue.get_request_pad('sink0')
        self.gst_src_pad = queue.get_request_pad('sink1')

        app_src.get_pad('src').link(self.gst_src_pad)

        # Setup bus and message processor
        gst_bus = self.gst_pipeline.get_bus()
        gst_bus.add_signal_watch()
        gst_bus.connect('message', self.process_gst_message)

    def process_new_pad(self, source, pad):
        pad.link(self.gst_uri_pad)

    def process_mopidy_message(self, message):
        """Process messages from the rest of Mopidy."""
        if message['command'] == 'play_uri':
            response = self.play_uri(message['uri'])
            connection = unpickle_connection(message['reply_to'])
            connection.send(response)
        elif message['command'] == 'deliver_data':
            self.deliver_data(message['caps'], message['data'])
        elif message['command'] == 'end_of_data_stream':
            self.end_of_data_stream()
        elif message['command'] == 'set_state':
            response = self.set_state(message['state'])
            connection = unpickle_connection(message['reply_to'])
            connection.send(response)<commit_msg>Start preprations for supporting switching between sources<commit_after>import gobject
gobject.threads_init()

import pygst
pygst.require('0.10')
import gst

import logging
import threading

from mopidy.process import BaseProcess, unpickle_connection

logger = logging.getLogger('mopidy.outputs.gstreamer')

class GStreamerOutput(object):
    """
    Audio output through GStreamer.

    Starts the :class:`GStreamerProcess`.
    """

    def __init__(self, core_queue, output_queue):
        self.process = GStreamerProcess(core_queue, output_queue)
        self.process.start()

    def destroy(self):
        self.process.terminate()

class GStreamerMessagesThread(threading.Thread):
    def run(self):
        gobject.MainLoop().run()

class GStreamerProcess(BaseProcess):
    """
    A process for all work related to GStreamer.

    The main loop processes events from both Mopidy and GStreamer.

    Make sure this subprocess is started by the MainThread in the top-most
    parent process, and not some other thread. If not, we can get into the
    problems described at
    http://jameswestby.net/weblog/tech/14-caution-python-multiprocessing-and-glib-dont-mix.html.
    """

    def __init__(self, core_queue, output_queue):
        super(GStreamerProcess, self).__init__()
        self.core_queue = core_queue
        self.output_queue = output_queue
        self.gst_pipeline = None
        self.gst_target = None

    def run_inside_try(self):
        self.setup()
        while True:
            message = self.output_queue.get()
            self.process_mopidy_message(message)

    def setup(self):
        logger.debug(u'Setting up GStreamer pipeline')

        # Start a helper thread that can run the gobject.MainLoop
        messages_thread = GStreamerMessagesThread()
        messages_thread.daemon = True
        messages_thread.start()

        self.gst_pipeline = gst.parse_launch(' ! '.join([
            'volume name=volume',
            'alsasink'
        ]))

        self.gst_target = self.gst_pipeline.get_by_name('volume')

        decode_bin = gst.element_factory_make('uridecodebin', 'uri')
        decode_bin.connect('pad-added', self.process_new_pad)
        self.gst_pipeline.add(decode_bin)

        # Setup bus and message processor
        gst_bus = self.gst_pipeline.get_bus()
        gst_bus.add_signal_watch()
        gst_bus.connect('message', self.process_gst_message)

    def process_new_pad(self, source, pad):
        pad.link(self.gst_target.get_pad('sink'))

    def process_mopidy_message(self, message):
        """Process messages from the rest of Mopidy."""
        if message['command'] == 'play_uri':
            response = self.play_uri(message['uri'])
            connection = unpickle_connection(message['reply_to'])
            connection.send(response)
        elif message['command'] == 'deliver_data':
            self.deliver_data(message['caps'], message['data'])
        elif message['command'] == 'end_of_data_stream':
            self.end_of_data_stream()
        elif message['command'] == 'set_state':
            response = self.set_state(message['state'])
            connection = unpickle_connection(message['reply_to'])
            connection.send(response)
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