path: root/voctocore/lib/pipeline.py

#!/usr/bin/python3
import os, errno, time, logging
from gi.repository import GLib, Gst

# import controlserver annotation
from lib.controlserver import controlServerEntrypoint

# import library components
from lib.config import Config
from lib.quadmix import QuadMix
from lib.videomix import VideoMix
# from lib.audiomix import AudioMix
from lib.distributor import TimesTwoDistributor
from lib.shmsrc import FailsafeShmSrc

class Pipeline(Gst.Pipeline):
    """mixing, streaming and encoding pipeline constuction and control"""
    log = logging.getLogger('Pipeline')
    videonames = []
    audionames = []

    def __init__(self):
        super().__init__()

        self.log.debug('Creating Video-Mixer')
        # create audio and video mixer
        self.quadmixer = QuadMix()
        self.add(self.quadmixer)

        self.videomixer = VideoMix()
        self.add(self.videomixer)

        # self.audiomixer = AudioMix()
        # self.add(self.audiomixer)

        # read the path where the shm-control-sockets are located and ensure it exists
        socketpath = Config.get('sources', 'socketpath')
        self.log.info('Ensuring the configured socketpath exists: %s', socketpath)
        try:
            os.makedirs(socketpath)
        except OSError as exception:
            if exception.errno != errno.EEXIST:
                raise

        self.videonames = Config.getlist('sources', 'video')
        self.audionames = Config.getlist('sources', 'video')

        for name in self.videonames:
            socket = os.path.join(socketpath, 'v-'+name)

            self.log.info('Creating video-source "%s" at socket-path %s', name, socket)
            sourcebin = FailsafeShmSrc(socket)
            self.add(sourcebin)

            distributor = TimesTwoDistributor()
            self.add(distributor)
            sourcebin.link(distributor)

            mixerpad = self.quadmixer.request_mixer_pad()
            distributor.get_static_pad('src_a').link(mixerpad)

            mixerpad = self.videomixer.request_mixer_pad()
            distributor.get_static_pad('src_b').link(mixerpad)

        # for audiosource in Config.getlist('sources', 'audio'):
        #   sourcebin = FailsafeShmSrc(os.path.join(socketpath, audiosource))

        #   self.add(sourcebin)
        #   sourcebin.link(self.audiomixer)

        # tell the quadmix that this were all sources and no more sources will come after this
        self.quadmixer.finalize()

        self.quadmixer.set_active(0)
        self.videomixer.set_active(0)

        self.quadmixsink = Gst.ElementFactory.make('autovideosink', 'quadmixsink')
        self.quadmixsink.set_property('sync', False)
        self.add(self.quadmixsink)
        self.quadmixer.link(self.quadmixsink)

        self.videosink = Gst.ElementFactory.make('autovideosink', 'videosink')
        self.videosink.set_property('sync', False)
        self.add(self.videosink)
        self.videomixer.link(self.videosink)

        # self.audiosink = Gst.ElementFactory.make('autoaudiosink', 'audiosink')
        # self.add(self.audiosink)
        # self.audiomixer.link(self.audiosink)

    def run(self):
        self.set_state(Gst.State.PAUSED)
        time.sleep(0.5)
        self.set_state(Gst.State.PLAYING)

    def quit(self):
        self.set_state(Gst.State.NULL)




    #   # collection of video-sources to connect to the quadmix
    #   quadmixSources = []

    #   # create camera sources
    #   for camberabin in self.createDummyCamSources():
    #       # link camerasource to audiomixer
    #       camberabin.get_by_name('audio_src').link(self.pipeline.get_by_name('liveaudio'))

    #       # inject a ×2 distributor and link one end to the live-mixer
    #       distributor = self.createDistributor(camberabin.get_by_name('video_src'), camberabin.get_name())
    #       distributor.get_by_name('a').link(self.pipeline.get_by_name('livevideo'))

    #       # collect the other end to add it later to the quadmix
    #       quadmixSources.append(distributor.get_by_name('b'))

    #   # TODO: generate pause & slides with another generator here which only
    #   # yields if the respective files are present and which only have a video-pad

    #   # add all video-sources to the quadmix-monitor-screen
    #   self.addVideosToQuadmix(quadmixSources, self.pipeline.get_by_name('quadmix'))

    #   # initialize to known defaults
    #   # TODO: make configurable
    #   self.switchVideo(0)
    #   self.switchAudio(0)

    #   Gst.debug_bin_to_dot_file(self.pipeline, Gst.DebugGraphDetails.ALL, 'test')
    #   self.pipeline.set_state(Gst.State.PLAYING)






    # def createMixer(self):
    #   """create audio and video mixer"""
    #   # create mixer-pipeline from string
    #   mixerbin = Gst.parse_bin_from_description("""
    #       videomixer name=livevideo ! autovideosink
    #       input-selector name=liveaudio ! autoaudiosink

    #       videotestsrc pattern="solid-color" foreground-color=0x808080 ! capsfilter name=filter ! videomixer name=quadmix ! autovideosink
    #   """, False)

    #   # define caps for the videotestsrc which generates the background-color for the quadmix
    #   bgcaps = Gst.Caps.new_empty_simple('video/x-raw')
    #   bgcaps.set_value('width', round(self.monitorSize[0]))
    #   bgcaps.set_value('height', round(self.monitorSize[1]))
    #   mixerbin.get_by_name('filter').set_property('caps', bgcaps)

    #   # name the bin, add and return it
    #   mixerbin.set_name('mixerbin')
    #   self.pipeline.add(mixerbin)
    #   return mixerbin

    # def addVideosToQuadmix(self, videosources, quadmix):
    #   """add all avaiable videosources to the quadmix"""
    #   count = len(videosources)

    #   # coordinate of the cell where we place the next video
    #   place = [0, 0]
        
    #   # number of cells in the quadmix-monitor
    #   grid = [0, 0]
    #   grid[0] = math.ceil(math.sqrt(count))
    #   grid[1] = math.ceil(count / grid[0])

    #   # size of each cell in the quadmix-monitor
    #   cellSize = (
    #       self.monitorSize[0] / grid[0],
    #       self.monitorSize[1] / grid[1]
    #   )

    #   print("showing {} videosources in a {}×{} grid in a {}×{} px window, which gives cells of {}×{} px per videosource".format(
    #       count, grid[0], grid[1], self.monitorSize[0], self.monitorSize[1], cellSize[0], cellSize[1]))

    #   # iterate over all video-sources
    #   for idx, videosource in enumerate(videosources):
    #       # generate a pipeline for this videosource which
    #       # - scales the video to the request
    #       # - remove n px of the video (n = 5 if the video is highlighted else 0)
    #       # - add a colored border of n px of the video (n = 5 if the video is highlighted else 0)
    #       # - overlay the index of the video as text in the top left corner
    #       # - known & named output
    #       previewbin = Gst.parse_bin_from_description("""
    #           videoscale name=in !
    #           capsfilter name=caps !
    #           videobox name=crop top=0 left=0 bottom=0 right=0 !
    #           videobox fill=red top=-0 left=-0 bottom=-0 right=-0 name=add !
    #           textoverlay color=0xFFFFFFFF halignment=left valignment=top xpad=10 ypad=5 font-desc="sans 35" name=text !
    #           identity name=out
    #       """, False)

    #       # name the bin and add it
    #       previewbin.set_name('previewbin-{}'.format(idx))
    #       self.pipeline.add(previewbin)
    #       self.previewbins.append(previewbin)

    #       # set the overlay-text
    #       previewbin.get_by_name('text').set_property('text', str(idx))

    #       # query the video-source caps and extract its size
    #       caps = videosource.get_static_pad('src').query_caps(None)
    #       capsstruct = caps.get_structure(0)
    #       srcSize = (
    #           capsstruct.get_int('width')[1],
    #           capsstruct.get_int('height')[1],
    #       )

    #       # calculate the ideal scale factor and scale the sizes
    #       f = max(srcSize[0] / cellSize[0], srcSize[1] / cellSize[1])
    #       scaleSize = (
    #           srcSize[0] / f,
    #           srcSize[1] / f,
    #       )

    #       # calculate the top/left coordinate
    #       coord = (
    #           place[0] * cellSize[0] + (cellSize[0] - scaleSize[0]) / 2,
    #           place[1] * cellSize[1] + (cellSize[1] - scaleSize[1]) / 2,
    #       )

    #       print("placing videosource {} of size {}×{} scaled by {} to {}×{} in a cell {}×{} px cell ({}/{}) at position ({}/{})".format(
    #           idx, srcSize[0], srcSize[1], f, scaleSize[0], scaleSize[1], cellSize[0], cellSize[1], place[0], place[1], coord[0], coord[1]))

    #       # link the videosource to the input of the preview-bin
    #       videosource.link(previewbin.get_by_name('in'))

    #       # create and set the caps for the preview-scaler
    #       scalecaps = Gst.Caps.new_empty_simple('video/x-raw')
    #       scalecaps.set_value('width', round(scaleSize[0]))
    #       scalecaps.set_value('height', round(scaleSize[1]))
    #       previewbin.get_by_name('caps').set_property('caps', scalecaps)

    #       # request a pad from the quadmixer and configure x/y position
    #       sinkpad = quadmix.get_request_pad('sink_%u')
    #       sinkpad.set_property('xpos', round(coord[0]))
    #       sinkpad.set_property('ypos', round(coord[1]))

    #       # link the output of the preview-bin to the mixer
    #       previewbin.get_by_name('out').link(quadmix)

    #       # increment grid position
    #       place[0] += 1
    #       if place[0] >= grid[0]:
    #           place[1] += 1
    #           place[0] = 0

    # def createDistributor(self, videosource, name):
    #   """create a simple ×2 distributor"""
    #   distributor = Gst.parse_bin_from_description("""
    #       tee name=t
    #       t. ! queue name=a
    #       t. ! queue name=b
    #   """, False)

    #   # set a name and add to pipeline
    #   distributor.set_name('distributor({0})'.format(name))
    #   self.pipeline.add(distributor)

    #   # link input to the tee
    #   videosource.link(distributor.get_by_name('t'))
    #   return distributor

    # def createDummyCamSources(self):
    #   """create test-video-sources from files or urls"""

    #   # TODO make configurable
    #   uris = ('file:///home/peter/122.mp4', 'file:///home/peter/10025.mp4',)
    #   for idx, uri in enumerate(uris):
    #       # create a bin for a simulated camera input
    #       # force the input resolution to 1024x576 because that way the following elements
    #       # in the pipeline cam know the size even if the file is not yet loaded. the quadmixer
    #       # is not resize-capable
    #       camberabin = Gst.parse_bin_from_description("""
    #           uridecodebin name=input
    #           input. ! videoconvert ! videoscale ! videorate ! video/x-raw,width=1024,height=576,framerate=25/1 ! identity name=video_src
    #           input. ! audioconvert name=audio_src
    #       """, False)

    #       # set name and uri
    #       camberabin.set_name('dummy-camberabin({0})'.format(uri))
    #       camberabin.get_by_name('input').set_property('uri', uri)

    #       # add to pipeline and pass the bin upstream
    #       self.pipeline.add(camberabin)
    #       yield camberabin


    # def createCamSources(self):
    #   """create real-video-sources from the bmd-drivers"""

    #   # TODO make number of installed cams configurable
    #   for cam in range(2):
    #       # create a bin for camera input
    #       camberabin = Gst.parse_bin_from_description("""
    #           decklinksrc name=input input=sdi input-mode=1080p25
    #           input. ! videoconvert ! videoscale ! videorate ! video/x-raw,width=1920,height=1080,framerate=25/1 ! identity name=video_src
    #           input. ! audioconvert name=audio_src
    #       """, False)

    #       # set name and subdevice
    #       camberabin.set_name('camberabin({0})'.format(cam))
    #       camberabin.get_by_name('input').set_property('subdevice', cam)

    #       # add to pipeline and pass the bin upstream
    #       self.pipeline.add(camberabin)
    #       yield camberabin




    ### below are access-methods for the ControlServer
    @controlServerEntrypoint
    def status(self):
        """System Status Query"""
        raise NotImplementedError("status command is not implemented yet")

    @controlServerEntrypoint
    def numAudioSources(self):
        """return number of available audio sources"""
        raise NotImplementedError("audio is not implemented yet")


    @controlServerEntrypoint
    def switchAudio(self, audiosource):
        """switch audio to the selected audio"""
        raise NotImplementedError("audio is not implemented yet")


    @controlServerEntrypoint
    def numVideoSources(self):
        """return number of available video sources"""
        livevideo = self.pipeline.get_by_name('livevideo')
        return str(len(self.videonames))


    @controlServerEntrypoint
    def switchVideo(self, videosource):
        """switch audio to the selected video"""
        if videosource.isnumeric():
            idx = int(videosource)
            self.log.info("interpreted input as videosource-index %u", idx)
            if idx >= len(self.videonames):
                idx = None
        else:
            try:
                idx = self.videonames.index(videosource)
                self.log.info("interpreted input as videosource-name, lookup to %u", idx)
            except IndexError:
                idx = None

        if idx == None:
            return 'unknown video-source: %s' % (videosource)

        self.log.info("switching quadmix to video-source %u", idx)
        self.quadmixer.set_active(idx)
        self.videomixer.set_active(idx)


    @controlServerEntrypoint
    def fadeVideo(self, videosource):
        """fade video to the selected video"""
        raise NotImplementedError("fade command is not implemented yet")


    @controlServerEntrypoint
    def setPipVideo(self, videosource):
        """switch video-source in the PIP to the selected video"""
        raise NotImplementedError("pip commands are not implemented yet")


    @controlServerEntrypoint
    def fadePipVideo(self, videosource):
        """fade video-source in the PIP to the selected video"""
        raise NotImplementedError("pip commands are not implemented yet")


    class PipPlacements:
        """enumeration of possible PIP-Placements"""
        TopLeft, TopRight, BottomLeft, BottomRight = range(4)


    @controlServerEntrypoint
    def setPipPlacement(self, placement):
        """place PIP in the selected position"""
        assert(isinstance(placement, PipPlacements))
        raise NotImplementedError("pip commands are not implemented yet")


    @controlServerEntrypoint
    def setPipStatus(self, enabled):
        """show or hide PIP"""
        raise NotImplementedError("pip commands are not implemented yet")


    @controlServerEntrypoint
    def fadePipStatus(self, enabled):
        """fade PIP in our out"""
        raise NotImplementedError("pip commands are not implemented yet")


    class StreamContents:
        """enumeration of possible PIP-Placements"""
        Live, Pause, NoStream = range(3)


    @controlServerEntrypoint
    def selectStreamContent(self, content):
        """switch the livestream-content between selected mixer output, pause-image or nostream-imag"""
        assert(isinstance(content, StreamContents))
        raise NotImplementedError("pause/nostream switching is not implemented yet")