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105 lines
3 KiB
Python
105 lines
3 KiB
Python
'''
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Simple mixer element, accepts 320 x 240 RGBA at 30 fps
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on any number of sinkpads.
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Requires PIL (Python Imaging Library)
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Example pipeline:
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gst-launch-1.0 py_videomixer name=mixer ! videoconvert ! autovideosink \
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videotestsrc ! mixer. \
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videotestsrc pattern=ball ! mixer. \
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videotestsrc pattern=snow ! mixer.
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'''
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import gi
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gi.require_version('Gst', '1.0')
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gi.require_version('GstBase', '1.0')
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gi.require_version('GObject', '2.0')
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from gi.repository import Gst, GObject, GstBase
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Gst.init(None)
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try:
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from PIL import Image
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except ImportError:
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Gst.error('py_videomixer requires PIL')
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raise
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# Completely fixed input / output
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ICAPS = Gst.Caps(Gst.Structure('video/x-raw',
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format='RGBA',
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width=320,
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height=240,
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framerate=Gst.Fraction(30, 1)))
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OCAPS = Gst.Caps(Gst.Structure('video/x-raw',
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format='RGBA',
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width=320,
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height=240,
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framerate=Gst.Fraction(30, 1)))
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class BlendData:
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def __init__(self, outimg):
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self.outimg = outimg
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self.pts = 0
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self.eos = True
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class Videomixer(GstBase.Aggregator):
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__gstmetadata__ = ('Videomixer','Video/Mixer', \
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'Python video mixer', 'Mathieu Duponchelle')
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__gsttemplates__ = (
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Gst.PadTemplate.new_with_gtype("sink_%u",
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Gst.PadDirection.SINK,
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Gst.PadPresence.REQUEST,
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ICAPS,
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GstBase.AggregatorPad.__gtype__),
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Gst.PadTemplate.new_with_gtype("src",
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Gst.PadDirection.SRC,
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Gst.PadPresence.ALWAYS,
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OCAPS,
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GstBase.AggregatorPad.__gtype__)
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)
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def mix_buffers(self, agg, pad, bdata):
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buf = pad.pop_buffer()
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_, info = buf.map(Gst.MapFlags.READ)
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img = Image.frombuffer('RGBA', (320, 240), info.data, "raw", 'RGBA', 0, 1)
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bdata.outimg = Image.blend(bdata.outimg, img, alpha=0.5)
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bdata.pts = buf.pts
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buf.unmap(info)
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bdata.eos = False
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return True
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def do_aggregate(self, timeout):
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outimg = Image.new('RGBA', (320, 240), 0x00000000)
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bdata = BlendData(outimg)
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self.foreach_sink_pad(self.mix_buffers, bdata)
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data = bdata.outimg.tobytes()
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outbuf = Gst.Buffer.new_allocate(None, len(data), None)
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outbuf.fill(0, data)
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outbuf.pts = bdata.pts
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self.finish_buffer (outbuf)
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# We are EOS when no pad was ready to be aggregated,
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# this would obviously not work for live
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if bdata.eos:
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return Gst.FlowReturn.EOS
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return Gst.FlowReturn.OK
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GObject.type_register(Videomixer)
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__gstelementfactory__ = ("py_videomixer", Gst.Rank.NONE, Videomixer)
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