238 lines
8.6 KiB
Python
238 lines
8.6 KiB
Python
from pypofetch import PypoFetch
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from telnetliquidsoap import TelnetLiquidsoap
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from datetime import datetime
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from datetime import timedelta
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import eventtypes
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import time
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class PypoLiquidsoap():
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def __init__(self, logger, telnet_lock, host, port):
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self.logger = logger
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self.liq_queue_tracker = {
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"s0": None,
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"s1": None,
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"s2": None,
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"s3": None,
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}
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self.telnet_liquidsoap = TelnetLiquidsoap(telnet_lock, \
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logger,\
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host,\
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port,\
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self.liq_queue_tracker.keys())
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def get_telnet_dispatcher(self):
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return self.telnet_liquidsoap
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def play(self, media_item):
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if media_item["type"] == eventtypes.FILE:
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self.handle_file_type(media_item)
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elif media_item["type"] == eventtypes.EVENT:
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self.handle_event_type(media_item)
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elif media_item["type"] == eventtypes.STREAM_BUFFER_START:
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self.telnet_liquidsoap.start_web_stream_buffer(media_item)
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elif media_item["type"] == eventtypes.STREAM_OUTPUT_START:
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if media_item['row_id'] != self.telnet_liquidsoap.current_prebuffering_stream_id:
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#this is called if the stream wasn't scheduled sufficiently ahead of time
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#so that the prebuffering stage could take effect. Let's do the prebuffering now.
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self.telnet_liquidsoap.start_web_stream_buffer(media_item)
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self.telnet_liquidsoap.start_web_stream(media_item)
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elif media_item['type'] == eventtypes.STREAM_BUFFER_END:
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self.telnet_liquidsoap.stop_web_stream_buffer()
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elif media_item['type'] == eventtypes.STREAM_OUTPUT_END:
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self.telnet_liquidsoap.stop_web_stream_output()
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else: raise UnknownMediaItemType(str(media_item))
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def handle_file_type(self, media_item):
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"""
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Wait maximum 5 seconds (50 iterations) for file to become ready,
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otherwise give up on it.
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"""
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iter_num = 0
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while not media_item['file_ready'] and iter_num < 50:
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time.sleep(0.1)
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iter_num += 1
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if media_item['file_ready']:
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available_queue = self.find_available_queue()
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try:
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self.telnet_liquidsoap.queue_push(available_queue, media_item)
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self.liq_queue_tracker[available_queue] = media_item
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except Exception as e:
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self.logger.error(e)
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raise
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else:
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self.logger.warn("File %s did not become ready in less than 5 seconds. Skipping...", media_item['dst'])
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def handle_event_type(self, media_item):
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if media_item['event_type'] == "kick_out":
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self.telnet_liquidsoap.disconnect_source("live_dj")
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elif media_item['event_type'] == "switch_off":
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self.telnet_liquidsoap.switch_source("live_dj", "off")
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def is_media_item_finished(self, media_item):
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if media_item is None:
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return True
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else:
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return datetime.utcnow() > media_item['end']
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def find_available_queue(self):
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available_queue = None
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for i in self.liq_queue_tracker:
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mi = self.liq_queue_tracker[i]
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if mi == None or self.is_media_item_finished(mi):
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#queue "i" is available. Push to this queue
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available_queue = i
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if available_queue == None:
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raise NoQueueAvailableException()
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return available_queue
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def verify_correct_present_media(self, scheduled_now):
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#verify whether Liquidsoap is currently playing the correct files.
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#if we find an item that Liquidsoap is not playing, then push it
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#into one of Liquidsoap's queues. If Liquidsoap is already playing
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#it do nothing. If Liquidsoap is playing a track that isn't in
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#currently_playing then stop it.
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#Check for Liquidsoap media we should source.skip
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#get liquidsoap items for each queue. Since each queue can only have one
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#item, we should have a max of 8 items.
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#2013-03-21-22-56-00_0: {
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#id: 1,
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#type: "stream_output_start",
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#row_id: 41,
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#uri: "http://stream2.radioblackout.org:80/blackout.ogg",
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#start: "2013-03-21-22-56-00",
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#end: "2013-03-21-23-26-00",
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#show_name: "Untitled Show",
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#independent_event: true
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#},
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scheduled_now_files = \
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filter(lambda x: x["type"] == eventtypes.FILE, scheduled_now)
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scheduled_now_webstream = \
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filter(lambda x: x["type"] == eventtypes.STREAM_OUTPUT_START, \
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scheduled_now)
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schedule_ids = set(map(lambda x: x["row_id"], scheduled_now_files))
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row_id_map = {}
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liq_queue_ids = set()
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for i in self.liq_queue_tracker:
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mi = self.liq_queue_tracker[i]
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if not self.is_media_item_finished(mi):
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liq_queue_ids.add(mi["row_id"])
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row_id_map[mi["row_id"]] = mi
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to_be_removed = set()
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to_be_added = set()
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#Iterate over the new files, and compare them to currently scheduled
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#tracks. If already in liquidsoap queue still need to make sure they don't
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#have different attributes such replay_gain etc.
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for i in scheduled_now_files:
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if i["row_id"] in row_id_map:
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mi = row_id_map[i["row_id"]]
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correct = mi['start'] == i['start'] and \
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mi['end'] == i['end'] and \
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mi['row_id'] == i['row_id'] and \
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mi['replay_gain'] == i['replay_gain']
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if not correct:
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#need to re-add
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self.logger.info("Track %s found to have new attr." % i)
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to_be_removed.add(i["row_id"])
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to_be_added.add(i["row_id"])
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to_be_removed.update(liq_queue_ids - schedule_ids)
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to_be_added.update(schedule_ids - liq_queue_ids)
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if len(to_be_removed):
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self.logger.info("Need to remove items from Liquidsoap: %s" % \
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to_be_removed)
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#remove files from Liquidsoap's queue
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for i in self.liq_queue_tracker:
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mi = self.liq_queue_tracker[i]
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if mi is not None and mi["row_id"] in to_be_removed:
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self.stop(i)
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if len(to_be_added):
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self.logger.info("Need to add items to Liquidsoap *now*: %s" % \
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to_be_added)
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for i in scheduled_now:
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if i["row_id"] in to_be_added:
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self.modify_cue_point(i)
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self.play(i)
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#handle webstreams
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current_stream_id = self.telnet_liquidsoap.get_current_stream_id()
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if len(scheduled_now_webstream):
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if current_stream_id != scheduled_now_webstream[0]:
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self.play(scheduled_now_webstream[0])
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elif current_stream_id != "-1":
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#something is playing and it shouldn't be.
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self.telnet_liquidsoap.stop_web_stream_buffer()
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self.telnet_liquidsoap.stop_web_stream_output()
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def stop(self, queue):
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self.telnet_liquidsoap.queue_remove(queue)
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self.liq_queue_tracker[queue] = None
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def is_file(self, media_item):
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return media_item["type"] == eventtypes.FILE
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def clear_queue_tracker(self):
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for i in self.liq_queue_tracker.keys():
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self.liq_queue_tracker[i] = None
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def modify_cue_point(self, link):
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if not self.is_file(link):
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return
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tnow = datetime.utcnow()
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link_start = link['start']
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diff_td = tnow - link_start
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diff_sec = self.date_interval_to_seconds(diff_td)
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if diff_sec > 0:
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self.logger.debug("media item was supposed to start %s ago. Preparing to start..", diff_sec)
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original_cue_in_td = timedelta(seconds=float(link['cue_in']))
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link['cue_in'] = self.date_interval_to_seconds(original_cue_in_td) + diff_sec
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def date_interval_to_seconds(self, interval):
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"""
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Convert timedelta object into int representing the number of seconds. If
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number of seconds is less than 0, then return 0.
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"""
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seconds = (interval.microseconds + \
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(interval.seconds + interval.days * 24 * 3600) * 10 ** 6) / float(10 ** 6)
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if seconds < 0: seconds = 0
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return seconds
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def clear_all_queues(self):
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self.telnet_liquidsoap.queue_clear_all()
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class UnknownMediaItemType(Exception):
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pass
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class NoQueueAvailableException(Exception):
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pass
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