457 lines
16 KiB
Python
457 lines
16 KiB
Python
"""
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this entire module is lovingly based on the gst-launch tool kindly provided
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by the gstreamer wizards themselves...with unecessary crap cut out
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we make the following assumptions here and optimize as such
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- all streams are "live"
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- will not need EOS (no mp4s)
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- will not require SIGINT (this entire program won't understand them anyways)
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- no tags or TOCs
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From a logging an error handling standpoint, all 'errors' here are logged as
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'critical' which will shut down the entire program and send an email.
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"""
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import gi, time, os, logging
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from datetime import datetime
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from threading import Lock, Event
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from auxilary import waitForPath, mkdirSafe
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from exceptionThreading import async
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from sharedLogging import gluster
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logger = logging.getLogger(__name__)
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logger.setLevel(logging.INFO)
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gi.require_version('Gst', '1.0')
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gi.require_version('GObject', '2.0')
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from gi.repository import Gst, GObject
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class GstException(Exception):
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pass
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def _gstPrintMsg(pName, frmt, *args, level=logging.DEBUG, sName=None):
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if sName:
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logger.log(level, '[{}] [{}] '.format(pName, sName) + frmt.format(*args))
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else:
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logger.log(level, '[{}] '.format(pName) + frmt.format(*args))
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if level == logging.ERROR:
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raise GstException
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def _processErrorMessage(pName, sName, msg):
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error, debug = msg.parse_error()
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if debug:
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_gstPrintMsg(pName, '{} - Additional debug info: {}', error.message, debug,
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level=logging.ERROR, sName=sName)
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else:
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_gstPrintMsg(pName, error.message, level=logging.ERROR, sName=sName)
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def _linkElements(e1, e2, caps=None):
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if caps:
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if not e1.link_filtered(e2, caps):
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logger.error('cannot link \"%s\" to \"%s\" with caps %s',
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e1.get_name(), e2.get_name(), caps.to_string())
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raise SystemExit
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else:
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if not e1.link(e2):
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logger.error('cannot link \%s\" to \"%s\"', e1.get_name(), e2.get_name())
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raise SystemExit
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class ThreadedPipeline:
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'''
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Launches a Gst Pipeline in a separate thread. Note that the 'threaded'
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aspect is impimented via and async decorator around the mainLoop below
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'''
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def __init__(self, pName):
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self._pipeline = Gst.Pipeline.new(pName)
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self._stopper = Event()
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def start(self, play=True):
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self._startPipeline(play)
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# TODO: this might not all be necessary
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def stop(self):
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self._stopper.set()
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self._pipeline.set_state(Gst.State.NULL)
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logger.debug('Shut down gstreamer pipeline: %s', self._pipeline.get_name())
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def __del__(self):
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self.stop()
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# TODO: make it clearer which pipeline everything comes from
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def _eventLoop(self, block=True, doProgress=False, targetState=Gst.State.PLAYING):
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'''
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This is the main loop that processes information on the bus and decides
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how the pipeline should react. Sometimes this entails spitting out
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messages, others it involves changing state or some other manipulation.
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'''
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buffering = False
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inProgress = False
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prerolled = targetState != Gst.State.PAUSED
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pName = self._pipeline.get_name()
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bus = self._pipeline.get_bus()
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while not self._stopper.isSet():
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# TODO: if we actually want to stop the pipeline asyncronously we
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# need to post a message on the bus that tells it to stop. Otherwise
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# it will wait here forever (or will be terminated as a daemon
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# thread by its parent)
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msg = bus.timed_pop(1e18 if block else 0)
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if not msg:
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return
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msgSrc = msg.src
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msgSrcName = msgSrc.get_name()
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msgType = msg.type
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msgTypeName = Gst.MessageType.get_name(msgType)
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# messages that involve manipulating the pipeline
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if msgType == Gst.MessageType.REQUEST_STATE:
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state = msg.parse_request_state()
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logger.info('Setting state to %s as requested by %s',
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state.value_name, msgSrcName)
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self._pipeline.set_state(state)
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elif msgType == Gst.MessageType.CLOCK_LOST:
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logger.debug('Clock lost. Getting new one.')
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self._pipeline.set_state(Gst.State.PAUSED)
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self._pipeline.set_state(Gst.State.PLAYING)
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elif msgType == Gst.MessageType.LATENCY:
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_gstPrintMsg(pName, 'Redistributing latency', sName=msgSrcName)
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self._pipeline.recalculate_latency()
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# messages that do not require pipeline manipulation
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elif msgType == Gst.MessageType.BUFFERING:
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_gstPrintMsg(pName, 'Buffering: {}', msg.parse_buffering(), sName=msgSrcName)
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elif msgType == Gst.MessageType.NEW_CLOCK:
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clock = msg.parse_new_clock()
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clock = clock.get_name() if clock else 'NULL'
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_gstPrintMsg(pName, 'New clock: {}', clock)
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elif msgType == Gst.MessageType.INFO:
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error, debug = msg.parse_info()
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if debug:
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_gstPrintMsg(pName, debug, level=logging.INFO, sName=msgSrcName)
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elif msgType == Gst.MessageType.WARNING:
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error, debug = msg.parse_warning()
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if debug:
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_gstPrintMsg(pName, '{} - Additional debug info: {}', error.message,
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debug, level=logging.WARNING, sName=msgSrcName)
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else:
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_gstPrintMsg(pName, error.message, level=logging.WARNING, sName=msgSrcName)
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elif msgType == Gst.MessageType.ERROR:
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_processErrorMessage(pName, msgSrcName, msg)
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elif msgType == Gst.MessageType.STATE_CHANGED:
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# we only care about pipeline level state changes
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if msgSrc == self._pipeline:
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old, new, pending = msg.parse_state_changed()
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# we only care if we reach the final target state
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if targetState == Gst.State.PAUSED and new == Gst.State.PAUSED:
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prerolled = True
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if buffering:
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_gstPrintMsg(pName, 'Prerolled, waiting for buffering to finish',
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level=logging.INFO)
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continue
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if inProgress:
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_gstPrintMsg(pName, 'Prerolled, waiting for progress to finish',
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level=logging.INFO)
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continue
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return
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elif msgType == Gst.MessageType.PROGRESS:
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progressType, code, text = msg.parse_progress()
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if (progressType == Gst.ProgressType.START or
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progressType == Gst.ProgressType.CONTINUE):
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if doProgress:
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inProgress = True
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block = True
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elif (progressType == Gst.ProgressType.COMPLETE or
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progressType == Gst.ProgressType.CANCELLED or
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progressType == Gst.ProgressType.ERROR):
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inProgress = False
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_gstPrintMsg(pName, 'Progress: ({}) {}', code, text, sName=msgSrcName)
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if doProgress and not inProgress and not buffering and prerolled:
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return
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elif msgType == Gst.MessageType.HAVE_CONTEXT:
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context = msg.parse_have_context()
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_gstPrintMsg(
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pName,
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'Got context: {}={}',
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context.get_context_type(),
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context.get_structure().to_string(),
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sName = msgSrcName
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)
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elif msgType == Gst.MessageType.PROPERTY_NOTIFY:
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obj, propName, val = msg.parse_property_notify()
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valStr = '(no value)'
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if val:
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if GObject.type_check_value_holds(val, GObject.TYPE_STRING):
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valStr = val.dup_string()
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elif val.g_type.is_a(Gst.Caps.__gtype__):
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valStr = val.get_boxed().to_string()
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else:
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valStr = Gst.value_serialize(val)
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_gstPrintMsg(pName, '{}: {} = {}', obj.get_name(), propName,
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valStr, sName=msgSrcName)
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# these are things I might not need...
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elif msgType == Gst.MessageType.STREAM_START:
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if msgSrc == self._pipeline:
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_gstPrintMsg(pName, 'Started stream', level=logging.INFO)
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elif msgType == Gst.MessageType.QOS:
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frmt, processed, dropped = msg.parse_qos_stats()
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jitter, proportion, quality = msg.parse_qos_values()
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_gstPrintMsg(
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pName,
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'QOS stats: jitter={} dropped={}',
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jitter,
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'-' if frmt == Gst.Format.UNDEFINED else dropped,
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sName = msgSrcName
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)
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elif msgType == Gst.MessageType.ELEMENT:
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_gstPrintMsg(pName, 'Unknown message ELEMENT', sName=msgSrcName)
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elif msgType == Gst.MessageType.UNKNOWN:
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_gstPrintMsg(pName, 'Unknown message', sName=msgSrcname)
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@async(daemon=True)
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def _mainLoop(self):
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self._eventLoop(block=True, doProgress=False, targetState=Gst.State.PLAYING)
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def _startPipeline(self, play):
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pName = self._pipeline.get_name()
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stateChange = self._pipeline.set_state(Gst.State.PAUSED)
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_gstPrintMsg(pName, 'Setting to PAUSED', level=logging.INFO)
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if stateChange == Gst.StateChangeReturn.FAILURE:
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_gstPrintMsg(pName, 'Cannot set to PAUSE', level=logging.INFO)
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self._eventLoop(block=False, doProgress=False, targetState=Gst.State.VOID_PENDING)
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# we should always end up here because live
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elif stateChange == Gst.StateChangeReturn.NO_PREROLL:
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_gstPrintMsg(pName, 'Live and does not need preroll')
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elif stateChange == Gst.StateChangeReturn.ASYNC:
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_gstPrintMsg(pName, 'Prerolling')
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try:
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_eventLoop(block=True, doProgress=True, targetState=Gst.State.PAUSED)
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except GstException:
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_gstPrintMsg(pName, 'Does not want to preroll', level=logging.ERROR)
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raise SystemExit
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elif stateChange == Gst.StateChangeReturn.SUCCESS:
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_gstPrintMsg(pName, 'Is prerolled')
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# this should always succeed...
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try:
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self._eventLoop(block=False, doProgress=True, targetState=Gst.State.PLAYING)
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except GstException:
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_gstPrintMsg(pName, 'Does not want to preroll', level=logging.ERROR)
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raise SystemExit
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# ...and end up here
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else:
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if play:
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_gstPrintMsg(pName, 'Setting to PLAYING', level=logging.INFO)
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# ...and since this will ALWAYS be successful...
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if self._pipeline.set_state(Gst.State.PLAYING) == Gst.StateChangeReturn.FAILURE:
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_gstPrintMsg(pName, 'Cannot set to PLAYING', level=logging.ERROR)
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err = self._pipeline.get_bus().pop_filtered(Gst.MessageType.Error)
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_processErrorMessage(pName, msgSrcName, err)
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# ...we end up here and loop until Tool releases their next album
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try:
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self._mainLoop()
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except:
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raise GstException
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class Camera(ThreadedPipeline):
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'''
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Class for usb camera. The 'video' and 'audio' flags are meant for testing.
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Makes two independent stream that share the same pipeline, and thus share a
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clock for syncronization. Video uses the hardware-accelarated OMX extensions
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for H264 encoding. Audio has no hardware accelaration (and thus is likely
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the most resource hungry thing in this program) and encodes using Opus. Both
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send their stream to two UDP ports (900X for video, 800X for audio, where
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X = 1 is used by the Janus WebRTC interface and X = 2 is used by the
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FileDump class below.
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'''
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def __init__(self, video=True, audio=True):
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super().__init__('camera')
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vPath = '/dev/video0'
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if video:
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vSource = Gst.ElementFactory.make("v4l2src", "videoSource")
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vConvert = Gst.ElementFactory.make("videoconvert", "videoConvert")
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vScale = Gst.ElementFactory.make("videoscale", "videoScale")
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vClock = Gst.ElementFactory.make("clockoverlay", "videoClock")
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vEncode = Gst.ElementFactory.make("omxh264enc", "videoEncoder")
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vRTPPay = Gst.ElementFactory.make("rtph264pay", "videoRTPPayload")
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vRTPSink = Gst.ElementFactory.make("multiudpsink", "videoRTPSink")
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vSource.set_property('device', vPath)
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vRTPPay.set_property('config-interval', 1)
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vRTPPay.set_property('pt', 96)
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vRTPSink.set_property('clients', '127.0.0.1:9001,127.0.0.1:9002')
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vCaps = Gst.Caps.from_string('video/x-raw,width=640,height=480,framerate=30/1')
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self._pipeline.add(vSource, vConvert, vScale, vClock, vEncode, vRTPPay, vRTPSink)
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_linkElements(vSource, vConvert)
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_linkElements(vConvert, vScale)
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_linkElements(vScale, vClock, vCaps)
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_linkElements(vClock, vEncode)
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_linkElements(vEncode, vRTPPay)
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_linkElements(vRTPPay, vRTPSink)
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if audio:
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aSource = Gst.ElementFactory.make("alsasrc", "audioSource")
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aConvert = Gst.ElementFactory.make("audioconvert", "audioConvert")
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aScale = Gst.ElementFactory.make("audioresample", "audioResample")
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aEncode = Gst.ElementFactory.make("opusenc", "audioEncode")
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aRTPPay = Gst.ElementFactory.make("rtpopuspay", "audioRTPPayload")
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aRTPSink = Gst.ElementFactory.make("multiudpsink", "audioRTPSink")
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aSource.set_property('device', 'hw:1,0')
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aRTPSink.set_property('clients', '127.0.0.1:8001,127.0.0.1:8002')
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aCaps = Gst.Caps.from_string('audio/x-raw,rate=48000,channels=1')
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self._pipeline.add(aSource, aConvert, aScale, aEncode, aRTPPay, aRTPSink)
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_linkElements(aSource, aConvert)
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_linkElements(aConvert, aScale)
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_linkElements(aScale, aEncode, aCaps)
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_linkElements(aEncode, aRTPPay)
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_linkElements(aRTPPay, aRTPSink)
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waitForPath(vPath) # video is on usb, so wait until it comes back after we hard reset the bus
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self.start()
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class FileDump(ThreadedPipeline):
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'''
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Pipeline that takes audio and input from two udp ports, muxes them, and
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dumps the result to a file. Intended to work with the Camera above. Will
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init to a paused state, then will transition to a playing state (which will
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dump the file) when at least one initiator registers with the class.
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Initiators are represented by unique identifiers held in a list. The current
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use case is that each identifier is for the pin of the IR sensor that
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detects motion, and thus adding a pin number to the list signifies that
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video/audio should be recorded
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'''
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def __init__(self):
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self._initiators = []
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self._lock = Lock()
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if not gluster.isMounted:
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logger.error('Attempting to init FileDump without gluster mounted. Aborting')
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raise SystemExit
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self._savePath = os.path.join(gluster.mountpoint + '/video')
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mkdirSafe(self._savePath, logger)
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super().__init__('filedump')
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aSource = Gst.ElementFactory.make('udpsrc', 'audioSource')
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aJitBuf = Gst.ElementFactory.make('rtpjitterbuffer', 'audioJitterBuffer')
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aDepay = Gst.ElementFactory.make('rtpopusdepay', 'audioDepay')
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aQueue = Gst.ElementFactory.make('queue', 'audioQueue')
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aCaps = Gst.Caps.from_string('application/x-rtp,encoding-name=OPUS,payload=96')
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vSource = Gst.ElementFactory.make('udpsrc', 'videoSource')
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vJitBuf = Gst.ElementFactory.make('rtpjitterbuffer', 'videoJitterBuffer')
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vDepay = Gst.ElementFactory.make('rtph264depay', 'videoDepay')
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vParse = Gst.ElementFactory.make('h264parse', 'videoParse')
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vQueue = Gst.ElementFactory.make('queue', 'videoQueue')
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vCaps = Gst.Caps.from_string('application/x-rtp,encoding-name=H264,payload=96')
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mux = Gst.ElementFactory.make('matroskamux', 'mux')
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self.sink = Gst.ElementFactory.make('filesink', 'sink')
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self.sink.set_property('location', '/dev/null')
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aSource.set_property('port', 8002)
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vSource.set_property('port', 9002)
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self._pipeline.add(aSource, aJitBuf, aDepay, aQueue,
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vSource, vJitBuf, vDepay, vParse, vQueue, mux, self.sink)
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_linkElements(aSource, aJitBuf, aCaps)
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_linkElements(aJitBuf, aDepay)
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_linkElements(aDepay, aQueue)
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_linkElements(aQueue, mux)
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_linkElements(vSource, vJitBuf, vCaps)
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_linkElements(vJitBuf, vDepay)
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_linkElements(vDepay, vParse)
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_linkElements(vParse, vQueue)
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_linkElements(vQueue, mux)
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_linkElements(mux, self.sink)
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# TODO: there is probably a better way to init than starting up to PAUSE
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# and then dropping back down to NULL
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self.start(play=False)
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self._pipeline.post_message(Gst.Message.new_request_state(self._pipeline, Gst.State.NULL))
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def addInitiator(self, identifier):
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with self._lock:
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if identifier in self._initiators:
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logger.warn('Identifier \'%s\' already in FileDump initiator list', identifier)
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else:
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self._initiators.append(identifier)
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if self._pipeline.get_state(Gst.CLOCK_TIME_NONE).state == Gst.State.NULL:
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filePath = os.path.join(self._savePath, '{}.mkv'.format(datetime.now()))
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self.sink.set_property('location', filePath)
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# TODO: cannot post messages from null to change state, is this bad?
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self._pipeline.set_state(Gst.State.PLAYING)
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def removeInitiator(self, identifier):
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with self._lock:
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try:
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self._initiators.remove(identifier)
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except ValueError:
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logger.warn('Attempted to remove nonexistant identifier \'%s\'', identifier)
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if len(self._initiators) == 0:
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self._pipeline.set_state(Gst.State.NULL)
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Gst.init(None)
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