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Copyright (c) <year> <owner>. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
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this list of conditions and the following disclaimer in the documentation
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# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
import pykms
import selectors
import sys
class KMSRenderer:
def __init__(self, state):
self.state = state
self.cm = state.cm
self.contexts = state.contexts
self.running = False
card = pykms.Card()
res = pykms.ResourceManager(card)
conn = res.reserve_connector()
crtc = res.reserve_crtc(conn)
mode = conn.get_default_mode()
modeb = mode.to_blob(card)
req = pykms.AtomicReq(card)
req.add_connector(conn, crtc)
req.add_crtc(crtc, modeb)
r = req.commit_sync(allow_modeset=True)
assert(r == 0)
self.card = card
self.resman = res
self.crtc = crtc
self.mode = mode
self.bufqueue = []
self.current = None
self.next = None
self.cam_2_drm = {}
# KMS
def close(self):
req = pykms.AtomicReq(self.card)
for s in self.streams:
req.add_plane(s['plane'], None, None, dst=(0, 0, 0, 0))
req.commit()
def add_plane(self, req, stream, fb):
s = next(s for s in self.streams if s['stream'] == stream)
idx = s['idx']
plane = s['plane']
if idx % 2 == 0:
x = 0
else:
x = self.mode.hdisplay - fb.width
if idx // 2 == 0:
y = 0
else:
y = self.mode.vdisplay - fb.height
req.add_plane(plane, fb, self.crtc, dst=(x, y, fb.width, fb.height))
def apply_request(self, drmreq):
buffers = drmreq['camreq'].buffers
req = pykms.AtomicReq(self.card)
for stream, fb in buffers.items():
drmfb = self.cam_2_drm.get(fb, None)
self.add_plane(req, stream, drmfb)
req.commit()
def handle_page_flip(self, frame, time):
old = self.current
self.current = self.next
if len(self.bufqueue) > 0:
self.next = self.bufqueue.pop(0)
else:
self.next = None
if self.next:
drmreq = self.next
self.apply_request(drmreq)
if old:
req = old['camreq']
ctx = old['camctx']
self.state.request_processed(ctx, req)
def queue(self, drmreq):
if not self.next:
self.next = drmreq
self.apply_request(drmreq)
else:
self.bufqueue.append(drmreq)
# libcamera
def setup(self):
self.streams = []
idx = 0
for ctx in self.contexts:
for stream in ctx.streams:
cfg = stream.configuration
fmt = cfg.pixel_format
fmt = pykms.PixelFormat(fmt.fourcc)
plane = self.resman.reserve_generic_plane(self.crtc, fmt)
assert(plane is not None)
self.streams.append({
'idx': idx,
'stream': stream,
'plane': plane,
'fmt': fmt,
'size': cfg.size,
})
for fb in ctx.allocator.buffers(stream):
w = cfg.size.width
h = cfg.size.height
fds = []
strides = []
offsets = []
for plane in fb.planes:
fds.append(plane.fd)
strides.append(cfg.stride)
offsets.append(plane.offset)
drmfb = pykms.DmabufFramebuffer(self.card, w, h, fmt,
fds, strides, offsets)
self.cam_2_drm[fb] = drmfb
idx += 1
def readdrm(self, fileobj):
for ev in self.card.read_events():
if ev.type == pykms.DrmEventType.FLIP_COMPLETE:
self.handle_page_flip(ev.seq, ev.time)
def readcam(self, fd):
self.running = self.state.event_handler()
def readkey(self, fileobj):
sys.stdin.readline()
self.running = False
def run(self):
print('Capturing...')
self.running = True
sel = selectors.DefaultSelector()
sel.register(self.card.fd, selectors.EVENT_READ, self.readdrm)
sel.register(self.cm.event_fd, selectors.EVENT_READ, self.readcam)
sel.register(sys.stdin, selectors.EVENT_READ, self.readkey)
print('Press enter to exit')
while self.running:
events = sel.select()
for key, mask in events:
callback = key.data
callback(key.fileobj)
print('Exiting...')
def request_handler(self, ctx, req):
drmreq = {
'camctx': ctx,
'camreq': req,
}
self.queue(drmreq)
