[libcamera-devel,v9,7/7] py: Add cam.py

15827 diff mbox series

Add cam.py, which mimics the 'cam' tool. Four rendering backends are
added:

* null - Do nothing
* kms - Use KMS with dmabufs
* qt - SW render on a Qt window
* qtgl - OpenGL render on a Qt window

All the renderers handle only a few pixel formats, and especially the GL
renderer is just a prototype.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 src/py/cam/cam.py        | 472 +++++++++++++++++++++++++++++++++++++++
 src/py/cam/cam_kms.py    | 183 +++++++++++++++
 src/py/cam/cam_null.py   |  47 ++++
 src/py/cam/cam_qt.py     | 354 +++++++++++++++++++++++++++++
 src/py/cam/cam_qtgl.py   | 385 +++++++++++++++++++++++++++++++
 src/py/cam/gl_helpers.py |  74 ++++++
 6 files changed, 1515 insertions(+)
 create mode 100755 src/py/cam/cam.py
 create mode 100644 src/py/cam/cam_kms.py
 create mode 100644 src/py/cam/cam_null.py
 create mode 100644 src/py/cam/cam_qt.py
 create mode 100644 src/py/cam/cam_qtgl.py
 create mode 100644 src/py/cam/gl_helpers.py

Hi Tomi,

Thank you for the patch.

On Sat, May 07, 2022 at 01:11:52PM +0300, Tomi Valkeinen wrote:
> Add cam.py, which mimics the 'cam' tool. Four rendering backends are
> added:
> 
> * null - Do nothing
> * kms - Use KMS with dmabufs
> * qt - SW render on a Qt window
> * qtgl - OpenGL render on a Qt window
> 
> All the renderers handle only a few pixel formats, and especially the GL
> renderer is just a prototype.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> ---
>  src/py/cam/cam.py        | 472 +++++++++++++++++++++++++++++++++++++++
>  src/py/cam/cam_kms.py    | 183 +++++++++++++++
>  src/py/cam/cam_null.py   |  47 ++++
>  src/py/cam/cam_qt.py     | 354 +++++++++++++++++++++++++++++
>  src/py/cam/cam_qtgl.py   | 385 +++++++++++++++++++++++++++++++
>  src/py/cam/gl_helpers.py |  74 ++++++
>  6 files changed, 1515 insertions(+)
>  create mode 100755 src/py/cam/cam.py
>  create mode 100644 src/py/cam/cam_kms.py
>  create mode 100644 src/py/cam/cam_null.py
>  create mode 100644 src/py/cam/cam_qt.py
>  create mode 100644 src/py/cam/cam_qtgl.py
>  create mode 100644 src/py/cam/gl_helpers.py
> 
> diff --git a/src/py/cam/cam.py b/src/py/cam/cam.py
> new file mode 100755
> index 00000000..fc37089c
> --- /dev/null
> +++ b/src/py/cam/cam.py
> @@ -0,0 +1,472 @@
> +#!/usr/bin/env python3
> +
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> +
> +import argparse
> +import binascii
> +import libcamera as libcam
> +import os
> +import sys
> +
> +
> +class CustomAction(argparse.Action):
> +    def __init__(self, option_strings, dest, **kwargs):
> +        super().__init__(option_strings, dest, default={}, **kwargs)
> +
> +    def __call__(self, parser, namespace, values, option_string=None):
> +        if len(namespace.camera) == 0:
> +            print(f'Option {option_string} requires a --camera context')
> +            sys.exit(-1)
> +
> +        if self.type == bool:
> +            values = True
> +
> +        current = namespace.camera[-1]
> +
> +        data = getattr(namespace, self.dest)
> +
> +        if self.nargs == '+':
> +            if current not in data:
> +                data[current] = []
> +
> +            data[current] += values
> +        else:
> +            data[current] = values
> +
> +
> +def do_cmd_list(cm):
> +    print('Available cameras:')
> +
> +    for idx, c in enumerate(cm.cameras):
> +        print(f'{idx + 1}: {c.id}')
> +
> +
> +def do_cmd_list_props(ctx):
> +    camera = ctx['camera']
> +
> +    print('Properties for', ctx['id'])
> +
> +    for name, prop in camera.properties.items():
> +        print('\t{}: {}'.format(name, prop))
> +
> +
> +def do_cmd_list_controls(ctx):
> +    camera = ctx['camera']
> +
> +    print('Controls for', ctx['id'])
> +
> +    for name, prop in camera.controls.items():
> +        print('\t{}: {}'.format(name, prop))
> +
> +
> +def do_cmd_info(ctx):
> +    camera = ctx['camera']
> +
> +    print('Stream info for', ctx['id'])
> +
> +    roles = [libcam.StreamRole.Viewfinder]
> +
> +    camconfig = camera.generate_configuration(roles)
> +    if camconfig is None:
> +        raise Exception('Generating config failed')
> +
> +    for i, stream_config in enumerate(camconfig):
> +        print('\t{}: {}'.format(i, stream_config))
> +
> +        formats = stream_config.formats
> +        for fmt in formats.pixel_formats:
> +            print('\t * Pixelformat:', fmt, formats.range(fmt))
> +
> +            for size in formats.sizes(fmt):
> +                print('\t  -', size)
> +
> +

Could you please add a todo comment to remind that the following
functions should be moved to a class ? Same for the state.

> +def acquire(ctx):
> +    camera = ctx['camera']
> +
> +    camera.acquire()
> +
> +
> +def release(ctx):
> +    camera = ctx['camera']
> +
> +    camera.release()
> +
> +
> +def parse_streams(ctx):
> +    streams = []
> +
> +    for stream_desc in ctx['opt-stream']:
> +        stream_opts = {'role': libcam.StreamRole.Viewfinder}
> +
> +        for stream_opt in stream_desc.split(','):
> +            if stream_opt == 0:
> +                continue
> +
> +            arr = stream_opt.split('=')
> +            if len(arr) != 2:
> +                print('Bad stream option', stream_opt)
> +                sys.exit(-1)
> +
> +            key = arr[0]
> +            value = arr[1]
> +
> +            if key in ['width', 'height']:
> +                value = int(value)
> +            elif key == 'role':
> +                rolemap = {
> +                    'still': libcam.StreamRole.StillCapture,
> +                    'raw': libcam.StreamRole.Raw,
> +                    'video': libcam.StreamRole.VideoRecording,
> +                    'viewfinder': libcam.StreamRole.Viewfinder,
> +                }
> +
> +                role = rolemap.get(value.lower(), None)
> +
> +                if role is None:
> +                    print('Bad stream role', value)
> +                    sys.exit(-1)
> +
> +                value = role
> +            elif key == 'pixelformat':
> +                pass
> +            else:
> +                print('Bad stream option key', key)
> +                sys.exit(-1)
> +
> +            stream_opts[key] = value
> +
> +        streams.append(stream_opts)
> +
> +    return streams
> +
> +
> +def configure(ctx):
> +    camera = ctx['camera']
> +
> +    streams = parse_streams(ctx)
> +
> +    roles = [opts['role'] for opts in streams]
> +
> +    camconfig = camera.generate_configuration(roles)
> +    if camconfig is None:
> +        raise Exception('Generating config failed')
> +
> +    for idx, stream_opts in enumerate(streams):
> +        stream_config = camconfig.at(idx)
> +
> +        if 'width' in stream_opts and 'height' in stream_opts:
> +            stream_config.size = (stream_opts['width'], stream_opts['height'])
> +
> +        if 'pixelformat' in stream_opts:
> +            stream_config.pixel_format = stream_opts['pixelformat']
> +
> +    stat = camconfig.validate()
> +
> +    if stat == libcam.CameraConfiguration.Status.Invalid:
> +        print('Camera configuration invalid')
> +        exit(-1)
> +    elif stat == libcam.CameraConfiguration.Status.Adjusted:
> +        if ctx['opt-strict-formats']:
> +            print('Adjusting camera configuration disallowed by --strict-formats argument')
> +            exit(-1)
> +
> +        print('Camera configuration adjusted')
> +
> +    r = camera.configure(camconfig)
> +    if r != 0:
> +        raise Exception('Configure failed')
> +
> +    ctx['stream-names'] = {}
> +    ctx['streams'] = []
> +
> +    for idx, stream_config in enumerate(camconfig):
> +        stream = stream_config.stream
> +        ctx['streams'].append(stream)
> +        ctx['stream-names'][stream] = 'stream' + str(idx)
> +        print('{}-{}: stream config {}'.format(ctx['id'], ctx['stream-names'][stream], stream.configuration))
> +
> +
> +def alloc_buffers(ctx):
> +    camera = ctx['camera']
> +
> +    allocator = libcam.FrameBufferAllocator(camera)
> +
> +    for idx, stream in enumerate(ctx['streams']):
> +        ret = allocator.allocate(stream)
> +        if ret < 0:
> +            print('Cannot allocate buffers')
> +            exit(-1)
> +
> +        allocated = len(allocator.buffers(stream))
> +
> +        print('{}-{}: Allocated {} buffers'.format(ctx['id'], ctx['stream-names'][stream], allocated))
> +
> +    ctx['allocator'] = allocator
> +
> +
> +def create_requests(ctx):
> +    camera = ctx['camera']
> +
> +    ctx['requests'] = []
> +
> +    # Identify the stream with the least number of buffers
> +    num_bufs = min([len(ctx['allocator'].buffers(stream)) for stream in ctx['streams']])
> +
> +    requests = []
> +
> +    for buf_num in range(num_bufs):
> +        request = camera.create_request(ctx['idx'])
> +
> +        if request is None:
> +            print('Can not create request')
> +            exit(-1)
> +
> +        for stream in ctx['streams']:
> +            buffers = ctx['allocator'].buffers(stream)
> +            buffer = buffers[buf_num]
> +
> +            ret = request.add_buffer(stream, buffer)
> +            if ret < 0:
> +                print('Can not set buffer for request')
> +                exit(-1)
> +
> +        requests.append(request)
> +
> +    ctx['requests'] = requests
> +
> +
> +def start(ctx):
> +    camera = ctx['camera']
> +
> +    camera.start()
> +
> +
> +def stop(ctx):
> +    camera = ctx['camera']
> +
> +    camera.stop()
> +
> +
> +def queue_requests(ctx):
> +    camera = ctx['camera']
> +
> +    for request in ctx['requests']:
> +        camera.queue_request(request)
> +        ctx['reqs-queued'] += 1
> +
> +    del ctx['requests']
> +
> +
> +def capture_init(contexts):
> +    for ctx in contexts:
> +        acquire(ctx)
> +
> +    for ctx in contexts:
> +        configure(ctx)
> +
> +    for ctx in contexts:
> +        alloc_buffers(ctx)
> +
> +    for ctx in contexts:
> +        create_requests(ctx)
> +
> +
> +def capture_start(contexts):
> +    for ctx in contexts:
> +        start(ctx)
> +
> +    for ctx in contexts:
> +        queue_requests(ctx)
> +
> +
> +# Called from renderer when there is a libcamera event
> +def event_handler(state):
> +    cm = state['cm']
> +    contexts = state['contexts']
> +
> +    os.read(cm.efd, 8)
> +
> +    reqs = cm.get_ready_requests()
> +
> +    for req in reqs:
> +        ctx = next(ctx for ctx in contexts if ctx['idx'] == req.cookie)
> +        request_handler(state, ctx, req)
> +
> +    running = any(ctx['reqs-completed'] < ctx['opt-capture'] for ctx in contexts)
> +    return running
> +
> +
> +def request_handler(state, ctx, req):
> +    if req.status != libcam.Request.Status.Complete:
> +        raise Exception('{}: Request failed: {}'.format(ctx['id'], req.status))
> +
> +    buffers = req.buffers
> +
> +    # Compute the frame rate. The timestamp is arbitrarily retrieved from
> +    # the first buffer, as all buffers should have matching timestamps.
> +    ts = buffers[next(iter(buffers))].metadata.timestamp
> +    last = ctx.get('last', 0)
> +    fps = 1000000000.0 / (ts - last) if (last != 0 and (ts - last) != 0) else 0
> +    ctx['last'] = ts
> +    ctx['fps'] = fps
> +
> +    for stream, fb in buffers.items():
> +        stream_name = ctx['stream-names'][stream]
> +
> +        crcs = []
> +        if ctx['opt-crc']:
> +            with fb.mmap() as mfb:
> +                plane_crcs = [binascii.crc32(p) for p in mfb.planes]
> +                crcs.append(plane_crcs)
> +
> +        meta = fb.metadata
> +
> +        print('{:.6f} ({:.2f} fps) {}-{}: seq {}, bytes {}, CRCs {}'
> +              .format(ts / 1000000000, fps,
> +                      ctx['id'], stream_name,
> +                      meta.sequence, meta.bytesused,
> +                      crcs))
> +
> +        if ctx['opt-metadata']:
> +            reqmeta = req.metadata
> +            for ctrl, val in reqmeta.items():
> +                print(f'\t{ctrl} = {val}')
> +
> +        if ctx['opt-save-frames']:
> +            with fb.mmap() as mfb:
> +                filename = 'frame-{}-{}-{}.data'.format(ctx['id'], stream_name, ctx['reqs-completed'])
> +                with open(filename, 'wb') as f:
> +                    for p in mfb.planes:
> +                        f.write(p)
> +
> +    state['renderer'].request_handler(ctx, req)
> +
> +    ctx['reqs-completed'] += 1
> +
> +
> +# Called from renderer when it has finished with a request
> +def request_prcessed(ctx, req):
> +    camera = ctx['camera']
> +
> +    if ctx['reqs-queued'] < ctx['opt-capture']:
> +        req.reuse()
> +        camera.queue_request(req)
> +        ctx['reqs-queued'] += 1
> +
> +
> +def capture_deinit(contexts):
> +    for ctx in contexts:
> +        stop(ctx)
> +
> +    for ctx in contexts:
> +        release(ctx)
> +
> +
> +def do_cmd_capture(state):
> +    capture_init(state['contexts'])
> +
> +    renderer = state['renderer']
> +
> +    renderer.setup()
> +
> +    capture_start(state['contexts'])
> +
> +    renderer.run()
> +
> +    capture_deinit(state['contexts'])
> +
> +
> +def main():
> +    parser = argparse.ArgumentParser()
> +    # global options
> +    parser.add_argument('-l', '--list', action='store_true', help='List all cameras')
> +    parser.add_argument('-c', '--camera', type=int, action='extend', nargs=1, default=[], help='Specify which camera to operate on, by index')
> +    parser.add_argument('-p', '--list-properties', action='store_true', help='List cameras properties')
> +    parser.add_argument('--list-controls', action='store_true', help='List cameras controls')
> +    parser.add_argument('-I', '--info', action='store_true', help='Display information about stream(s)')
> +    parser.add_argument('-R', '--renderer', default='null', help='Renderer (null, kms, qt, qtgl)')
> +
> +    # per camera options
> +    parser.add_argument('-C', '--capture', nargs='?', type=int, const=1000000, action=CustomAction, help='Capture until interrupted by user or until CAPTURE frames captured')
> +    parser.add_argument('--crc', nargs=0, type=bool, action=CustomAction, help='Print CRC32 for captured frames')
> +    parser.add_argument('--save-frames', nargs=0, type=bool, action=CustomAction, help='Save captured frames to files')
> +    parser.add_argument('--metadata', nargs=0, type=bool, action=CustomAction, help='Print the metadata for completed requests')
> +    parser.add_argument('--strict-formats', type=bool, nargs=0, action=CustomAction, help='Do not allow requested stream format(s) to be adjusted')
> +    parser.add_argument('-s', '--stream', nargs='+', action=CustomAction)
> +    args = parser.parse_args()
> +
> +    cm = libcam.CameraManager.singleton()
> +
> +    if args.list:
> +        do_cmd_list(cm)
> +
> +    contexts = []
> +
> +    for cam_idx in args.camera:
> +        camera = next((c for i, c in enumerate(cm.cameras) if i + 1 == cam_idx), None)
> +
> +        if camera is None:
> +            print('Unable to find camera', cam_idx)
> +            return -1
> +
> +        contexts.append({
> +                        'camera': camera,
> +                        'idx': cam_idx,
> +                        'id': 'cam' + str(cam_idx),
> +                        'reqs-queued': 0,
> +                        'reqs-completed': 0,
> +                        'opt-capture': args.capture.get(cam_idx, False),
> +                        'opt-crc': args.crc.get(cam_idx, False),
> +                        'opt-save-frames': args.save_frames.get(cam_idx, False),
> +                        'opt-metadata': args.metadata.get(cam_idx, False),
> +                        'opt-strict-formats': args.strict_formats.get(cam_idx, False),
> +                        'opt-stream': args.stream.get(cam_idx, ['role=viewfinder']),
> +                        })
> +
> +    for ctx in contexts:
> +        print('Using camera {} as {}'.format(ctx['camera'].id, ctx['id']))
> +
> +    for ctx in contexts:
> +        if args.list_properties:
> +            do_cmd_list_props(ctx)
> +        if args.list_controls:
> +            do_cmd_list_controls(ctx)
> +        if args.info:
> +            do_cmd_info(ctx)
> +
> +    if args.capture:
> +
> +        state = {
> +            'cm': cm,
> +            'contexts': contexts,
> +            'event_handler': event_handler,
> +            'request_prcessed': request_prcessed,
> +        }
> +
> +        if args.renderer == 'null':
> +            import cam_null
> +            renderer = cam_null.NullRenderer(state)
> +        elif args.renderer == 'kms':
> +            import cam_kms
> +            renderer = cam_kms.KMSRenderer(state)
> +        elif args.renderer == 'qt':
> +            import cam_qt
> +            renderer = cam_qt.QtRenderer(state)
> +        elif args.renderer == 'qtgl':
> +            import cam_qtgl
> +            renderer = cam_qtgl.QtRenderer(state)
> +        else:
> +            print('Bad renderer', args.renderer)
> +            return -1
> +
> +        state['renderer'] = renderer
> +
> +        do_cmd_capture(state)
> +
> +    return 0
> +
> +
> +if __name__ == '__main__':
> +    sys.exit(main())
> diff --git a/src/py/cam/cam_kms.py b/src/py/cam/cam_kms.py
> new file mode 100644
> index 00000000..f4ee5a06
> --- /dev/null
> +++ b/src/py/cam/cam_kms.py
> @@ -0,0 +1,183 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> +
> +import pykms
> +import selectors
> +import sys
> +
> +FMT_MAP = {
> +    'RGB888': pykms.PixelFormat.RGB888,
> +    'YUYV': pykms.PixelFormat.YUYV,
> +    'ARGB8888': pykms.PixelFormat.ARGB8888,
> +    'XRGB8888': pykms.PixelFormat.XRGB8888,
> +}
> +
> +
> +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
> +
> +        for stream, fb in buffers.items():
> +            drmfb = self.cam_2_drm.get(fb, None)
> +
> +            req = pykms.AtomicReq(self.card)
> +            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_prcessed'](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 = FMT_MAP[fmt]
> +
> +                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, h = cfg.size
> +                    stride = cfg.stride
> +                    fd = fb.fd(0)
> +                    drmfb = pykms.DmabufFramebuffer(self.card, w, h, fmt,
> +                                                    [fd], [stride], [0])
> +                    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'](self.state)
> +
> +    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.efd, 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)
> diff --git a/src/py/cam/cam_null.py b/src/py/cam/cam_null.py
> new file mode 100644
> index 00000000..391397f6
> --- /dev/null
> +++ b/src/py/cam/cam_null.py
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> +
> +import selectors
> +import sys
> +
> +
> +class NullRenderer:
> +    def __init__(self, state):
> +        self.state = state
> +
> +        self.cm = state['cm']
> +        self.contexts = state['contexts']
> +
> +        self.running = False
> +
> +    def setup(self):
> +        pass
> +
> +    def run(self):
> +        print('Capturing...')
> +
> +        self.running = True
> +
> +        sel = selectors.DefaultSelector()
> +        sel.register(self.cm.efd, 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 readcam(self, fd):
> +        self.running = self.state['event_handler'](self.state)
> +
> +    def readkey(self, fileobj):
> +        sys.stdin.readline()
> +        self.running = False
> +
> +    def request_handler(self, ctx, req):
> +        self.state['request_prcessed'](ctx, req)
> diff --git a/src/py/cam/cam_qt.py b/src/py/cam/cam_qt.py
> new file mode 100644
> index 00000000..40044866
> --- /dev/null
> +++ b/src/py/cam/cam_qt.py
> @@ -0,0 +1,354 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> +#
> +# Debayering code from PiCamera documentation
> +
> +from io import BytesIO
> +from numpy.lib.stride_tricks import as_strided
> +from PIL import Image
> +from PIL.ImageQt import ImageQt
> +from PyQt5 import QtCore, QtGui, QtWidgets
> +import numpy as np
> +import sys
> +
> +
> +def rgb_to_pix(rgb):
> +    img = Image.frombuffer('RGB', (rgb.shape[1], rgb.shape[0]), rgb)
> +    qim = ImageQt(img).copy()
> +    pix = QtGui.QPixmap.fromImage(qim)
> +    return pix
> +
> +
> +def separate_components(data, r0, g0, g1, b0):
> +    # Now to split the data up into its red, green, and blue components. The
> +    # Bayer pattern of the OV5647 sensor is BGGR. In other words the first
> +    # row contains alternating green/blue elements, the second row contains
> +    # alternating red/green elements, and so on as illustrated below:
> +    #
> +    # GBGBGBGBGBGBGB
> +    # RGRGRGRGRGRGRG
> +    # GBGBGBGBGBGBGB
> +    # RGRGRGRGRGRGRG
> +    #
> +    # Please note that if you use vflip or hflip to change the orientation
> +    # of the capture, you must flip the Bayer pattern accordingly
> +
> +    rgb = np.zeros(data.shape + (3,), dtype=data.dtype)
> +    rgb[r0[1]::2, r0[0]::2, 0] = data[r0[1]::2, r0[0]::2]  # Red
> +    rgb[g0[1]::2, g0[0]::2, 1] = data[g0[1]::2, g0[0]::2]  # Green
> +    rgb[g1[1]::2, g1[0]::2, 1] = data[g1[1]::2, g1[0]::2]  # Green
> +    rgb[b0[1]::2, b0[0]::2, 2] = data[b0[1]::2, b0[0]::2]  # Blue
> +
> +    return rgb
> +
> +
> +def demosaic(rgb, r0, g0, g1, b0):
> +    # At this point we now have the raw Bayer data with the correct values
> +    # and colors but the data still requires de-mosaicing and
> +    # post-processing. If you wish to do this yourself, end the script here!
> +    #
> +    # Below we present a fairly naive de-mosaic method that simply
> +    # calculates the weighted average of a pixel based on the pixels
> +    # surrounding it. The weighting is provided b0[1] a b0[1]te representation of
> +    # the Bayer filter which we construct first:
> +
> +    bayer = np.zeros(rgb.shape, dtype=np.uint8)
> +    bayer[r0[1]::2, r0[0]::2, 0] = 1  # Red
> +    bayer[g0[1]::2, g0[0]::2, 1] = 1  # Green
> +    bayer[g1[1]::2, g1[0]::2, 1] = 1  # Green
> +    bayer[b0[1]::2, b0[0]::2, 2] = 1  # Blue
> +
> +    # Allocate an array to hold our output with the same shape as the input
> +    # data. After this we define the size of window that will be used to
> +    # calculate each weighted average (3x3). Then we pad out the rgb and
> +    # bayer arrays, adding blank pixels at their edges to compensate for the
> +    # size of the window when calculating averages for edge pixels.
> +
> +    output = np.empty(rgb.shape, dtype=rgb.dtype)
> +    window = (3, 3)
> +    borders = (window[0] - 1, window[1] - 1)
> +    border = (borders[0] // 2, borders[1] // 2)
> +
> +    # rgb_pad = np.zeros((
> +    #    rgb.shape[0] + borders[0],
> +    #    rgb.shape[1] + borders[1],
> +    #    rgb.shape[2]), dtype=rgb.dtype)
> +    # rgb_pad[
> +    #    border[0]:rgb_pad.shape[0] - border[0],
> +    #    border[1]:rgb_pad.shape[1] - border[1],
> +    #    :] = rgb
> +    # rgb = rgb_pad
> +    #
> +    # bayer_pad = np.zeros((
> +    #    bayer.shape[0] + borders[0],
> +    #    bayer.shape[1] + borders[1],
> +    #    bayer.shape[2]), dtype=bayer.dtype)
> +    # bayer_pad[
> +    #    border[0]:bayer_pad.shape[0] - border[0],
> +    #    border[1]:bayer_pad.shape[1] - border[1],
> +    #    :] = bayer
> +    # bayer = bayer_pad
> +
> +    # In numpy >=1.7.0 just use np.pad (version in Raspbian is 1.6.2 at the
> +    # time of writing...)
> +    #
> +    rgb = np.pad(rgb, [
> +        (border[0], border[0]),
> +        (border[1], border[1]),
> +        (0, 0),
> +    ], 'constant')
> +    bayer = np.pad(bayer, [
> +        (border[0], border[0]),
> +        (border[1], border[1]),
> +        (0, 0),
> +    ], 'constant')
> +
> +    # For each plane in the RGB data, we use a nifty numpy trick
> +    # (as_strided) to construct a view over the plane of 3x3 matrices. We do
> +    # the same for the bayer array, then use Einstein summation on each
> +    # (np.sum is simpler, but copies the data so it's slower), and divide
> +    # the results to get our weighted average:
> +
> +    for plane in range(3):
> +        p = rgb[..., plane]
> +        b = bayer[..., plane]
> +        pview = as_strided(p, shape=(
> +            p.shape[0] - borders[0],
> +            p.shape[1] - borders[1]) + window, strides=p.strides * 2)
> +        bview = as_strided(b, shape=(
> +            b.shape[0] - borders[0],
> +            b.shape[1] - borders[1]) + window, strides=b.strides * 2)
> +        psum = np.einsum('ijkl->ij', pview)
> +        bsum = np.einsum('ijkl->ij', bview)
> +        output[..., plane] = psum // bsum
> +
> +    return output
> +
> +
> +def to_rgb(fmt, size, data):
> +    w = size[0]
> +    h = size[1]
> +
> +    if fmt == 'YUYV':
> +        # YUV422
> +        yuyv = data.reshape((h, w // 2 * 4))
> +
> +        # YUV444
> +        yuv = np.empty((h, w, 3), dtype=np.uint8)
> +        yuv[:, :, 0] = yuyv[:, 0::2]                    # Y
> +        yuv[:, :, 1] = yuyv[:, 1::4].repeat(2, axis=1)  # U
> +        yuv[:, :, 2] = yuyv[:, 3::4].repeat(2, axis=1)  # V
> +
> +        m = np.array([
> +            [ 1.0, 1.0, 1.0],
> +            [-0.000007154783816076815, -0.3441331386566162, 1.7720025777816772],
> +            [ 1.4019975662231445, -0.7141380310058594 , 0.00001542569043522235]

Extra space before comma. pycodestyle also warns about the space after [
here and two lines above, I don't mind keeping them for alignment, but
given that the other values are not aligned anyway, I think we could
drop them.

> +        ])
> +
> +        rgb = np.dot(yuv, m)
> +        rgb[:, :, 0] -= 179.45477266423404
> +        rgb[:, :, 1] += 135.45870971679688
> +        rgb[:, :, 2] -= 226.8183044444304
> +        rgb = rgb.astype(np.uint8)
> +
> +    elif fmt == 'RGB888':
> +        rgb = data.reshape((h, w, 3))
> +        rgb[:, :, [0, 1, 2]] = rgb[:, :, [2, 1, 0]]
> +
> +    elif fmt == 'BGR888':
> +        rgb = data.reshape((h, w, 3))
> +
> +    elif fmt in ['ARGB8888', 'XRGB8888']:
> +        rgb = data.reshape((h, w, 4))
> +        rgb = np.flip(rgb, axis=2)
> +        # drop alpha component
> +        rgb = np.delete(rgb, np.s_[0::4], axis=2)
> +
> +    elif fmt.startswith('S'):
> +        bayer_pattern = fmt[1:5]
> +        bitspp = int(fmt[5:])
> +
> +        # TODO: shifting leaves the lowest bits 0
> +        if bitspp == 8:
> +            data = data.reshape((h, w))
> +            data = data.astype(np.uint16) << 8
> +        elif bitspp in [10, 12]:
> +            data = data.view(np.uint16)
> +            data = data.reshape((h, w))
> +            data = data << (16 - bitspp)
> +        else:
> +            raise Exception('Bad bitspp:' + str(bitspp))
> +
> +        idx = bayer_pattern.find('R')
> +        assert(idx != -1)
> +        r0 = (idx % 2, idx // 2)
> +
> +        idx = bayer_pattern.find('G')
> +        assert(idx != -1)
> +        g0 = (idx % 2, idx // 2)
> +
> +        idx = bayer_pattern.find('G', idx + 1)
> +        assert(idx != -1)
> +        g1 = (idx % 2, idx // 2)
> +
> +        idx = bayer_pattern.find('B')
> +        assert(idx != -1)
> +        b0 = (idx % 2, idx // 2)
> +
> +        rgb = separate_components(data, r0, g0, g1, b0)
> +        rgb = demosaic(rgb, r0, g0, g1, b0)
> +        rgb = (rgb >> 8).astype(np.uint8)
> +
> +    else:
> +        rgb = None
> +
> +    return rgb
> +
> +
> +class QtRenderer:
> +    def __init__(self, state):
> +        self.state = state
> +
> +        self.cm = state['cm']
> +        self.contexts = state['contexts']
> +
> +    def setup(self):
> +        self.app = QtWidgets.QApplication([])
> +
> +        windows = []
> +
> +        for ctx in self.contexts:
> +            camera = ctx['camera']
> +
> +            for stream in ctx['streams']:
> +                fmt = stream.configuration.pixel_format
> +                size = stream.configuration.size
> +
> +                window = MainWindow(ctx, stream)
> +                window.setAttribute(QtCore.Qt.WA_ShowWithoutActivating)
> +                window.show()
> +                windows.append(window)
> +
> +        self.windows = windows
> +
> +    def run(self):
> +        camnotif = QtCore.QSocketNotifier(self.cm.efd, QtCore.QSocketNotifier.Read)
> +        camnotif.activated.connect(lambda x: self.readcam())
> +
> +        keynotif = QtCore.QSocketNotifier(sys.stdin.fileno(), QtCore.QSocketNotifier.Read)
> +        keynotif.activated.connect(lambda x: self.readkey())
> +
> +        print('Capturing...')
> +
> +        self.app.exec()
> +
> +        print('Exiting...')
> +
> +    def readcam(self):
> +        running = self.state['event_handler'](self.state)
> +
> +        if not running:
> +            self.app.quit()
> +
> +    def readkey(self):
> +        sys.stdin.readline()
> +        self.app.quit()
> +
> +    def request_handler(self, ctx, req):
> +        buffers = req.buffers
> +
> +        for stream, fb in buffers.items():
> +            wnd = next(wnd for wnd in self.windows if wnd.stream == stream)
> +
> +            wnd.handle_request(stream, fb)
> +
> +        self.state['request_prcessed'](ctx, req)
> +
> +    def cleanup(self):
> +        for w in self.windows:
> +            w.close()
> +
> +
> +class MainWindow(QtWidgets.QWidget):
> +    def __init__(self, ctx, stream):
> +        super().__init__()
> +
> +        self.ctx = ctx
> +        self.stream = stream
> +
> +        self.label = QtWidgets.QLabel()
> +
> +        windowLayout = QtWidgets.QHBoxLayout()
> +        self.setLayout(windowLayout)
> +
> +        windowLayout.addWidget(self.label)
> +
> +        controlsLayout = QtWidgets.QVBoxLayout()
> +        windowLayout.addLayout(controlsLayout)
> +
> +        windowLayout.addStretch()
> +
> +        group = QtWidgets.QGroupBox('Info')
> +        groupLayout = QtWidgets.QVBoxLayout()
> +        group.setLayout(groupLayout)
> +        controlsLayout.addWidget(group)
> +
> +        lab = QtWidgets.QLabel(ctx['id'])
> +        groupLayout.addWidget(lab)
> +
> +        self.frameLabel = QtWidgets.QLabel()
> +        groupLayout.addWidget(self.frameLabel)
> +
> +        group = QtWidgets.QGroupBox('Properties')
> +        groupLayout = QtWidgets.QVBoxLayout()
> +        group.setLayout(groupLayout)
> +        controlsLayout.addWidget(group)
> +
> +        camera = ctx['camera']
> +
> +        for k, v in camera.properties.items():
> +            lab = QtWidgets.QLabel()
> +            lab.setText(k + ' = ' + str(v))
> +            groupLayout.addWidget(lab)
> +
> +        group = QtWidgets.QGroupBox('Controls')
> +        groupLayout = QtWidgets.QVBoxLayout()
> +        group.setLayout(groupLayout)
> +        controlsLayout.addWidget(group)
> +
> +        for k, (min, max, default) in camera.controls.items():
> +            lab = QtWidgets.QLabel()
> +            lab.setText('{} = {}/{}/{}'.format(k, min, max, default))
> +            groupLayout.addWidget(lab)
> +
> +        controlsLayout.addStretch()
> +
> +    def buf_to_qpixmap(self, stream, fb):
> +        with fb.mmap() as mfb:
> +            cfg = stream.configuration
> +            w, h = cfg.size
> +            pitch = cfg.stride
> +
> +            if cfg.pixel_format == 'MJPEG':
> +                img = Image.open(BytesIO(mfb.planes[0]))
> +                qim = ImageQt(img).copy()
> +                pix = QtGui.QPixmap.fromImage(qim)
> +            else:
> +                data = np.array(mfb.planes[0], dtype=np.uint8)
> +                rgb = to_rgb(cfg.pixel_format, cfg.size, data)
> +
> +                if rgb is None:
> +                    raise Exception('Format not supported: ' + cfg.pixel_format)
> +
> +                pix = rgb_to_pix(rgb)
> +
> +        return pix
> +
> +    def handle_request(self, stream, fb):
> +        ctx = self.ctx
> +
> +        pix = self.buf_to_qpixmap(stream, fb)
> +        self.label.setPixmap(pix)
> +
> +        self.frameLabel.setText('Queued: {}\nDone: {}\nFps: {:.2f}'
> +                       .format(ctx['reqs-queued'], ctx['reqs-completed'], ctx['fps']))

pycodestyle reports

src/py/cam/cam_qt.py:354:24: E128 continuation line under-indented for visual indent

> diff --git a/src/py/cam/cam_qtgl.py b/src/py/cam/cam_qtgl.py
> new file mode 100644
> index 00000000..37b74d3f
> --- /dev/null
> +++ b/src/py/cam/cam_qtgl.py
> @@ -0,0 +1,385 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> +
> +from PyQt5 import QtCore, QtWidgets
> +from PyQt5.QtCore import Qt
> +
> +import math
> +import numpy as np
> +import os
> +import sys
> +
> +os.environ['PYOPENGL_PLATFORM'] = 'egl'
> +
> +import OpenGL
> +# OpenGL.FULL_LOGGING = True
> +
> +from OpenGL import GL as gl
> +from OpenGL.EGL.EXT.image_dma_buf_import import *
> +from OpenGL.EGL.KHR.image import *
> +from OpenGL.EGL.VERSION.EGL_1_0 import *
> +from OpenGL.EGL.VERSION.EGL_1_2 import *
> +from OpenGL.EGL.VERSION.EGL_1_3 import *
> +
> +from OpenGL.GLES2.OES.EGL_image import *
> +from OpenGL.GLES2.OES.EGL_image_external import *
> +from OpenGL.GLES2.VERSION.GLES2_2_0 import *
> +from OpenGL.GLES3.VERSION.GLES3_3_0 import *
> +
> +from OpenGL.GL import shaders
> +
> +from gl_helpers import *
> +
> +# libcamera format string -> DRM fourcc
> +FMT_MAP = {
> +    'RGB888': 'RG24',
> +    'XRGB8888': 'XR24',
> +    'ARGB8888': 'AR24',
> +    'YUYV': 'YUYV',
> +}
> +
> +
> +class EglState:
> +    def __init__(self):
> +        self.create_display()
> +        self.choose_config()
> +        self.create_context()
> +        self.check_extensions()
> +
> +    def create_display(self):
> +        xdpy = getEGLNativeDisplay()
> +        dpy = eglGetDisplay(xdpy)
> +        self.display = dpy
> +
> +    def choose_config(self):
> +        dpy = self.display
> +
> +        major, minor = EGLint(), EGLint()
> +
> +        b = eglInitialize(dpy, major, minor)
> +        assert(b)
> +
> +        print('EGL {} {}'.format(
> +              eglQueryString(dpy, EGL_VENDOR).decode(),
> +              eglQueryString(dpy, EGL_VERSION).decode()))
> +
> +        check_egl_extensions(dpy, ['EGL_EXT_image_dma_buf_import'])
> +
> +        b = eglBindAPI(EGL_OPENGL_ES_API)
> +        assert(b)
> +
> +        def print_config(dpy, cfg):
> +
> +            def _getconf(dpy, cfg, a):
> +                value = ctypes.c_long()
> +                eglGetConfigAttrib(dpy, cfg, a, value)
> +                return value.value
> +
> +            getconf = lambda a: _getconf(dpy, cfg, a)

And here,

src/py/cam/cam_qtgl.py:78:13: E731 do not assign a lambda expression, use a def

> +
> +            print('EGL Config {}: color buf {}/{}/{}/{} = {}, depth {}, stencil {}, native visualid {}, native visualtype {}'.format(
> +                getconf(EGL_CONFIG_ID),
> +                getconf(EGL_ALPHA_SIZE),
> +                getconf(EGL_RED_SIZE),
> +                getconf(EGL_GREEN_SIZE),
> +                getconf(EGL_BLUE_SIZE),
> +                getconf(EGL_BUFFER_SIZE),
> +                getconf(EGL_DEPTH_SIZE),
> +                getconf(EGL_STENCIL_SIZE),
> +                getconf(EGL_NATIVE_VISUAL_ID),
> +                getconf(EGL_NATIVE_VISUAL_TYPE)))
> +
> +        if False:
> +            num_configs = ctypes.c_long()
> +            eglGetConfigs(dpy, None, 0, num_configs)
> +            print('{} configs'.format(num_configs.value))
> +
> +            configs = (EGLConfig * num_configs.value)()
> +            eglGetConfigs(dpy, configs, num_configs.value, num_configs)
> +            for config_id in configs:
> +                print_config(dpy, config_id)
> +
> +        config_attribs = [
> +            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
> +            EGL_RED_SIZE, 8,
> +            EGL_GREEN_SIZE, 8,
> +            EGL_BLUE_SIZE, 8,
> +            EGL_ALPHA_SIZE, 0,
> +            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
> +            EGL_NONE,
> +        ]
> +
> +        n = EGLint()
> +        configs = (EGLConfig * 1)()
> +        b = eglChooseConfig(dpy, config_attribs, configs, 1, n)
> +        assert(b and n.value == 1)
> +        config = configs[0]
> +
> +        print('Chosen Config:')
> +        print_config(dpy, config)
> +
> +        self.config = config
> +
> +    def create_context(self):
> +        dpy = self.display
> +
> +        context_attribs = [
> +            EGL_CONTEXT_CLIENT_VERSION, 2,
> +            EGL_NONE,
> +        ]
> +
> +        context = eglCreateContext(dpy, self.config, EGL_NO_CONTEXT, context_attribs)
> +        assert(context)
> +
> +        b = eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, context)
> +        assert(b)
> +
> +        self.context = context
> +
> +    def check_extensions(self):
> +        check_gl_extensions(['GL_OES_EGL_image'])
> +
> +        assert(eglCreateImageKHR)
> +        assert(eglDestroyImageKHR)
> +        assert(glEGLImageTargetTexture2DOES)
> +
> +
> +class QtRenderer:
> +    def __init__(self, state):
> +        self.state = state
> +
> +    def setup(self):
> +        self.app = QtWidgets.QApplication([])
> +
> +        window = MainWindow(self.state)
> +        window.setAttribute(QtCore.Qt.WA_ShowWithoutActivating)
> +        window.show()
> +
> +        self.window = window
> +
> +    def run(self):
> +        camnotif = QtCore.QSocketNotifier(self.state['cm'].efd, QtCore.QSocketNotifier.Read)
> +        camnotif.activated.connect(lambda x: self.readcam())
> +
> +        keynotif = QtCore.QSocketNotifier(sys.stdin.fileno(), QtCore.QSocketNotifier.Read)
> +        keynotif.activated.connect(lambda x: self.readkey())
> +
> +        print('Capturing...')
> +
> +        self.app.exec()
> +
> +        print('Exiting...')
> +
> +    def readcam(self):
> +        running = self.state['event_handler'](self.state)
> +
> +        if not running:
> +            self.app.quit()
> +
> +    def readkey(self):
> +        sys.stdin.readline()
> +        self.app.quit()
> +
> +    def request_handler(self, ctx, req):
> +        self.window.handle_request(ctx, req)
> +
> +    def cleanup(self):
> +        self.window.close()
> +
> +
> +class MainWindow(QtWidgets.QWidget):
> +    def __init__(self, state):
> +        super().__init__()
> +
> +        self.setAttribute(Qt.WA_PaintOnScreen)
> +        self.setAttribute(Qt.WA_NativeWindow)
> +
> +        self.state = state
> +
> +        self.textures = {}
> +        self.reqqueue = {}
> +        self.current = {}
> +
> +        for ctx in self.state['contexts']:
> +
> +            self.reqqueue[ctx['idx']] = []
> +            self.current[ctx['idx']] = []
> +
> +            for stream in ctx['streams']:
> +                fmt = stream.configuration.pixel_format
> +                size = stream.configuration.size
> +
> +                if fmt not in FMT_MAP:
> +                    raise Exception('Unsupported pixel format: ' + str(fmt))
> +
> +                self.textures[stream] = None
> +
> +        num_tiles = len(self.textures)
> +        self.num_columns = math.ceil(math.sqrt(num_tiles))
> +        self.num_rows = math.ceil(num_tiles / self.num_columns)
> +
> +        self.egl = EglState()
> +
> +        self.surface = None
> +
> +    def paintEngine(self):
> +        return None
> +
> +    def create_surface(self):
> +        native_surface = c_void_p(self.winId().__int__())
> +        surface = eglCreateWindowSurface(self.egl.display, self.egl.config,
> +                                         native_surface, None)
> +
> +        b = eglMakeCurrent(self.egl.display, self.surface, self.surface, self.egl.context)
> +        assert(b)
> +
> +        self.surface = surface
> +
> +    def init_gl(self):
> +        self.create_surface()
> +
> +        vertShaderSrc = '''
> +            attribute vec2 aPosition;
> +            varying vec2 texcoord;
> +
> +            void main()
> +            {
> +                gl_Position = vec4(aPosition * 2.0 - 1.0, 0.0, 1.0);
> +                texcoord.x = aPosition.x;
> +                texcoord.y = 1.0 - aPosition.y;
> +            }
> +        '''
> +        fragShaderSrc = '''
> +            #extension GL_OES_EGL_image_external : enable
> +            precision mediump float;
> +            varying vec2 texcoord;
> +            uniform samplerExternalOES texture;
> +
> +            void main()
> +            {
> +                gl_FragColor = texture2D(texture, texcoord);
> +            }
> +        '''
> +
> +        program = shaders.compileProgram(
> +            shaders.compileShader(vertShaderSrc, GL_VERTEX_SHADER),
> +            shaders.compileShader(fragShaderSrc, GL_FRAGMENT_SHADER)
> +        )
> +
> +        glUseProgram(program)
> +
> +        glClearColor(0.5, 0.8, 0.7, 1.0)
> +
> +        vertPositions = [
> +            0.0, 0.0,
> +            1.0, 0.0,
> +            1.0, 1.0,
> +            0.0, 1.0
> +        ]
> +
> +        inputAttrib = glGetAttribLocation(program, 'aPosition')
> +        glVertexAttribPointer(inputAttrib, 2, GL_FLOAT, GL_FALSE, 0, vertPositions)
> +        glEnableVertexAttribArray(inputAttrib)
> +
> +    def create_texture(self, stream, fb):
> +        cfg = stream.configuration
> +        fmt = cfg.pixel_format
> +        fmt = str_to_fourcc(FMT_MAP[fmt])
> +        w, h = cfg.size
> +
> +        attribs = [
> +            EGL_WIDTH, w,
> +            EGL_HEIGHT, h,
> +            EGL_LINUX_DRM_FOURCC_EXT, fmt,
> +            EGL_DMA_BUF_PLANE0_FD_EXT, fb.fd(0),
> +            EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,
> +            EGL_DMA_BUF_PLANE0_PITCH_EXT, cfg.stride,
> +            EGL_NONE,
> +        ]
> +
> +        image = eglCreateImageKHR(self.egl.display,
> +                                  EGL_NO_CONTEXT,
> +                                  EGL_LINUX_DMA_BUF_EXT,
> +                                  None,
> +                                  attribs)
> +        assert(image)
> +
> +        textures = glGenTextures(1)
> +        glBindTexture(GL_TEXTURE_EXTERNAL_OES, textures)
> +        glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
> +        glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
> +        glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
> +        glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
> +        glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, image)
> +
> +        return textures
> +
> +    def resizeEvent(self, event):
> +        size = event.size()
> +
> +        print('Resize', size)
> +
> +        super().resizeEvent(event)
> +
> +        if self.surface is None:
> +            return
> +
> +        glViewport(0, 0, size.width() // 2, size.height())
> +
> +    def paintEvent(self, event):
> +        if self.surface is None:
> +            self.init_gl()
> +
> +        for ctx_idx, queue in self.reqqueue.items():
> +            if len(queue) == 0:
> +                continue
> +
> +            ctx = next(ctx for ctx in self.state['contexts'] if ctx['idx'] == ctx_idx)
> +
> +            if self.current[ctx_idx]:
> +                old = self.current[ctx_idx]
> +                self.current[ctx_idx] = None
> +                self.state['request_prcessed'](ctx, old)
> +
> +            next_req = queue.pop(0)
> +            self.current[ctx_idx] = next_req
> +
> +            stream, fb = next(iter(next_req.buffers.items()))
> +
> +            self.textures[stream] = self.create_texture(stream, fb)
> +
> +        self.paint_gl()
> +
> +    def paint_gl(self):
> +        b = eglMakeCurrent(self.egl.display, self.surface, self.surface, self.egl.context)
> +        assert(b)
> +
> +        glClear(GL_COLOR_BUFFER_BIT)
> +
> +        size = self.size()
> +
> +        for idx, ctx in enumerate(self.state['contexts']):
> +            for stream in ctx['streams']:
> +                if self.textures[stream] is None:
> +                    continue
> +
> +                w = size.width() // self.num_columns
> +                h = size.height() // self.num_rows
> +
> +                x = idx % self.num_columns
> +                y = idx // self.num_columns
> +
> +                x *= w
> +                y *= h
> +
> +                glViewport(x, y, w, h)
> +
> +                glBindTexture(GL_TEXTURE_EXTERNAL_OES, self.textures[stream])
> +                glDrawArrays(GL_TRIANGLE_FAN, 0, 4)
> +
> +        b = eglSwapBuffers(self.egl.display, self.surface)
> +        assert(b)
> +
> +    def handle_request(self, ctx, req):
> +        self.reqqueue[ctx['idx']].append(req)
> +        self.update()
> diff --git a/src/py/cam/gl_helpers.py b/src/py/cam/gl_helpers.py
> new file mode 100644
> index 00000000..20a029cf
> --- /dev/null
> +++ b/src/py/cam/gl_helpers.py
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> +
> +from OpenGL.EGL.VERSION.EGL_1_0 import EGLNativeDisplayType, eglGetProcAddress, eglQueryString, EGL_EXTENSIONS
> +
> +from OpenGL.raw.GLES2 import _types as _cs
> +from OpenGL.GLES2.VERSION.GLES2_2_0 import *
> +from OpenGL.GLES3.VERSION.GLES3_3_0 import *
> +from OpenGL import GL as gl
> +
> +from ctypes import c_int, c_char_p, c_void_p, cdll, POINTER, util, \
> +    pointer, CFUNCTYPE, c_bool
> +
> +
> +def getEGLNativeDisplay():
> +    _x11lib = cdll.LoadLibrary(util.find_library('X11'))
> +    XOpenDisplay = _x11lib.XOpenDisplay
> +    XOpenDisplay.argtypes = [c_char_p]
> +    XOpenDisplay.restype = POINTER(EGLNativeDisplayType)
> +
> +    return XOpenDisplay(None)
> +
> +
> +# Hack. PyOpenGL doesn't seem to manage to find glEGLImageTargetTexture2DOES.
> +def getglEGLImageTargetTexture2DOES():
> +    funcptr = eglGetProcAddress('glEGLImageTargetTexture2DOES')
> +    prototype = CFUNCTYPE(None, _cs.GLenum, _cs.GLeglImageOES)
> +    return prototype(funcptr)
> +
> +
> +glEGLImageTargetTexture2DOES = getglEGLImageTargetTexture2DOES()
> +
> +
> +def str_to_fourcc(str):
> +    assert(len(str) == 4)
> +    fourcc = 0
> +    for i, v in enumerate([ord(c) for c in str]):
> +        fourcc |= v << (i * 8)
> +    return fourcc

Should we already add bindings for the PixelFormat class to handle this
better ? It can be done on top too, with a comment reminding that this
function should be dropped in favour of exposing PixelFormat in the
Python bindings.

With those small issues addressed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +
> +
> +def get_gl_extensions():
> +    n = GLint()
> +    glGetIntegerv(GL_NUM_EXTENSIONS, n)
> +    gl_extensions = []
> +    for i in range(n.value):
> +        gl_extensions.append(gl.glGetStringi(GL_EXTENSIONS, i).decode())
> +    return gl_extensions
> +
> +
> +def check_gl_extensions(required_extensions):
> +    extensions = get_gl_extensions()
> +
> +    if False:
> +        print('GL EXTENSIONS: ', ' '.join(extensions))
> +
> +    for ext in required_extensions:
> +        if ext not in extensions:
> +            raise Exception(ext + ' missing')
> +
> +
> +def get_egl_extensions(egl_display):
> +    return eglQueryString(egl_display, EGL_EXTENSIONS).decode().split(' ')
> +
> +
> +def check_egl_extensions(egl_display, required_extensions):
> +    extensions = get_egl_extensions(egl_display)
> +
> +    if False:
> +        print('EGL EXTENSIONS: ', ' '.join(extensions))
> +
> +    for ext in required_extensions:
> +        if ext not in extensions:
> +            raise Exception(ext + ' missing')