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import datetime | |
import threading | |
import traceback | |
import gi | |
gi.require_version('Gst', '1.0') | |
from gi.repository import Gst, GObject, GLib | |
def debug(*args) -> None: | |
print(datetime.datetime.now().time().isoformat(), threading.current_thread().name, *args) | |
# doesnt work | |
mipi_camera = '''nvarguscamerasrc name=front do-timestamp=true silent=false | |
! video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, format=(string)NV12, framerate=30/1 | |
! nvvidconv | |
! queue | |
''' | |
# works | |
usb_camera = ''' | |
v4l2src device=/dev/video1 do-timestamp=true name=front | |
! image/jpeg,width=1280,height=720,framerate=30/1 | |
! jpegdec | |
! videoconvert | |
! nvvidconv | |
! queue | |
''' | |
pipeline_desc = f''' | |
nvcompositor name=comp | |
sink_0::xpos=0 sink_0::ypos=0 sink_0::width=1280 sink_0::height=1080 | |
sink_1::xpos=0 sink_1::ypos=0 sink_1::width=1280 sink_1::height=720 | |
videotestsrc is-live=true do-timestamp=true name=background ! | |
video/x-raw,width=320,height=180,framerate=30/1 ! | |
nvvidconv ! | |
comp.sink_0 | |
comp. ! nvegltransform ! nveglglessink | |
''' | |
# works | |
camera_desc = usb_camera | |
# doesnt work | |
camera_desc = mipi_camera | |
Gst.init(None) | |
pipe = Gst.parse_launch(pipeline_desc) | |
bus = pipe.get_bus() | |
comp = pipe.get_by_name('comp') | |
def _pad_added(element, pad): | |
debug('_pad_added', element.name, pad.name) | |
srcbin = Gst.parse_bin_from_description(camera_desc, True) | |
static_pad = srcbin.get_static_pad('src') | |
pipe.add(srcbin) | |
pipe.sync_children_states() | |
static_pad.link(pad) | |
comp.connect('pad-added', _pad_added) | |
pipe.set_state(Gst.State.PLAYING) | |
def connect_front(): | |
debug("connecting front camera") | |
comp.get_request_pad('sink_1') | |
gloop = GObject.MainLoop() | |
GLib.timeout_add(3000, connect_front) | |
try: | |
gloop.run() | |
except: | |
traceback.print_exc() | |
pipe.send_event(Gst.Event.new_eos()) | |
keep_polling = True | |
while keep_polling: | |
message = bus.poll(Gst.MessageType.ANY, 1005000000) | |
debug(message) | |
keep_polling = message is not None | |
pipe.set_state(Gst.State.NULL) |
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Can the program be executed?