libcamera/vivid.git - libcamera pipeline handler for VIVID

diff options

Diffstat (limited to 'test/controls')

0 files changed, 0 insertions, 0 deletions

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185

#!/usr/bin/env python3

# SPDX-License-Identifier: BSD-3-Clause
# Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

# A simple capture example extending the simple-capture.py example:
# - Capture frames using events from multiple cameras
# - Listening events from stdin to exit the application
# - Memory mapping the frames and calculating CRC

import binascii
import libcamera as libcam
import libcamera.utils
import selectors
import sys


# A container class for our state per camera
class CameraCaptureContext:
    idx: int
    cam: libcam.Camera
    reqs: list[libcam.Request]
    mfbs: dict[libcam.FrameBuffer, libcamera.utils.MappedFrameBuffer]

    def __init__(self, cam, idx):
        self.idx = idx
        self.cam = cam

        # Acquire the camera for our use

        cam.acquire()

        # Configure the camera

        cam_config = cam.generate_configuration([libcam.StreamRole.Viewfinder])

        stream_config = cam_config.at(0)

        cam.configure(cam_config)

        stream = stream_config.stream

        # Allocate the buffers for capture

        allocator = libcam.FrameBufferAllocator(cam)
        ret = allocator.allocate(stream)
        assert ret > 0

        num_bufs = len(allocator.buffers(stream))

        print(f'cam{idx} ({cam.id}): capturing {num_bufs} buffers with {stream_config}')

        # Create the requests and assign a buffer for each request

        self.reqs = []
        self.mfbs = {}

        for i in range(num_bufs):
            # Use the buffer index as the "cookie"
            req = cam.create_request(idx)

            buffer = allocator.buffers(stream)[i]
            req.add_buffer(stream, buffer)

            self.reqs.append(req)

            # Save a mmapped buffer so we can calculate the CRC later
            self.mfbs[buffer] = libcamera.utils.MappedFrameBuffer(buffer).mmap()

    def uninit_camera(self):
        # Stop the camera

        self.cam.stop()

        # Release the camera

        self.cam.release()


# A container class for our state
class CaptureContext:
    cm: libcam.CameraManager
    camera_contexts: list[CameraCaptureContext] = []

    def handle_camera_event(self):
        # cm.get_ready_requests() returns the ready requests, which in our case
        # should almost always return a single Request, but in some cases there
        # could be multiple or none.

        reqs = self.cm.get_ready_requests()

        # Process the captured frames

        for req in reqs:
            self.handle_request(req)

        return True

    def handle_request(self, req: libcam.Request):
        cam_ctx = self.camera_contexts[req.cookie]

        buffers = req.buffers

        assert len(buffers) == 1

        # A ready Request could contain multiple buffers if multiple streams
        # were being used. Here we know we only have a single stream,
        # and we use next(iter()) to get the first and only buffer.

        stream, fb = next(iter(buffers.items()))

        # Use the MappedFrameBuffer to access the pixel data with CPU. We calculate
        # the crc for each plane.

        mfb = cam_ctx.mfbs[fb]
        crcs = [binascii.crc32(p) for p in mfb.planes]

        meta = fb.metadata

        print('cam{:<6} seq {:<6} bytes {:10} CRCs {}'
              .format(cam_ctx.idx,
                      meta.sequence,
                      '/'.join([str(p.bytes_used) for p in meta.planes]),
                      crcs))

        # We want to re-queue the buffer we just handled. Instead of creating
        # a new Request, we re-use the old one. We need to call req.reuse()
        # to re-initialize the Request before queuing.

        req.reuse()
        cam_ctx.cam.queue_request(req)

    def handle_key_event(self):
        sys.stdin.readline()
        print('Exiting...')
        return False

    def capture(self):
        # Queue the requests to the camera

        for cam_ctx in self.camera_contexts:
            for req in cam_ctx.reqs:
                cam_ctx.cam.queue_request(req)

        # Use Selector to wait for events from the camera and from the keyboard

        sel = selectors.DefaultSelector()
        sel.register(sys.stdin, selectors.EVENT_READ, self.handle_key_event)
        sel.register(self.cm.event_fd, selectors.EVENT_READ, lambda: self.handle_camera_event())

        running = True

        while running:
            events = sel.select()
            for key, mask in events:
                # If the handler return False, we should exit
                if not key.data():
                    running = False


def main():
    cm = libcam.CameraManager.singleton()

    ctx = CaptureContext()
    ctx.cm = cm


context:
space:
mode: