#!/usr/bin/env python3 # SPDX-License-Identifier: GPL-2.0-or-later # Copyright (C) 2022, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> from collections import defaultdict import errno import gc import libcamera as libcam import selectors import time import typing import unittest import weakref class BaseTestCase(unittest.TestCase): def assertZero(self, a, msg=None): self.assertEqual(a, 0, msg) class SimpleTestMethods(BaseTestCase): def test_get_ref(self): cm = libcam.CameraManager.singleton() wr_cm = weakref.ref(cm) cam = cm.get('platform/vimc.0 Sensor B') self.assertIsNotNone(cam) wr_cam = weakref.ref(cam) cm = None gc.collect() self.assertIsNotNone(wr_cm()) cam = None gc.collect() self.assertIsNone(wr_cm()) self.assertIsNone(wr_cam()) def test_acquire_release(self): cm = libcam.CameraManager.singleton() cam = cm.get('platform/vimc.0 Sensor B') self.assertIsNotNone(cam) ret = cam.acquire() self.assertZero(ret) ret = cam.release() self.assertZero(ret) def test_double_acquire(self): cm = libcam.CameraManager.singleton() cam = cm.get('platform/vimc.0 Sensor B') self.assertIsNotNone(cam) ret = cam.acquire() self.assertZero(ret) libcam.log_set_level('Camera', 'FATAL') ret = cam.acquire() self.assertEqual(ret, -errno.EBUSY) libcam.log_set_level('Camera', 'ERROR') ret = cam.release() self.assertZero(ret) ret = cam.release() # I expected EBUSY, but looks like double release works fine self.assertZero(ret) class CameraTesterBase(BaseTestCase): cm: typing.Any cam: typing.Any def setUp(self): self.cm = libcam.CameraManager.singleton() self.cam = next((cam for cam in self.cm.cameras if 'platform/vimc' in cam.id), None) if self.cam is None: self.cm = None self.skipTest('No vimc found') ret = self.cam.acquire() if ret != 0: self.cam = None self.cm = None raise Exception('Failed to acquire camera') self.wr_cam = weakref.ref(self.cam) self.wr_cm = weakref.ref(self.cm) def tearDown(self): # If a test fails, the camera may be in running state. So always stop. self.cam.stop() ret = self.cam.release() if ret != 0: raise Exception('Failed to release camera') self.cam = None self.cm = None self.assertIsNone(self.wr_cm()) self.assertIsNone(self.wr_cam()) class AllocatorTestMethods(CameraTesterBase): def test_allocator(self): cam = self.cam camconfig = cam.generate_configuration([libcam.StreamRole.StillCapture]) self.assertTrue(camconfig.size == 1) wr_camconfig = weakref.ref(camconfig) streamconfig = camconfig.at(0) wr_streamconfig = weakref.ref(streamconfig) ret = cam.configure(camconfig) self.assertZero(ret) stream = streamconfig.stream wr_stream = weakref.ref(stream) # stream should keep streamconfig and camconfig alive streamconfig = None camconfig = None gc.collect() self.assertIsNotNone(wr_camconfig()) self.assertIsNotNone(wr_streamconfig()) allocator = libcam.FrameBufferAllocator(cam) ret = allocator.allocate(stream) self.assertTrue(ret > 0) wr_allocator = weakref.ref(allocator) buffers = allocator.buffers(stream) self.assertIsNotNone(buffers) buffers = None buffer = allocator.buffers(stream)[0] self.assertIsNotNone(buffer) wr_buffer = weakref.ref(buffer) allocator = None gc.collect() self.assertIsNotNone(wr_buffer()) self.assertIsNotNone(wr_allocator()) self.assertIsNotNone(wr_stream()) buffer = None gc.collect() self.assertIsNone(wr_buffer()) self.assertIsNone(wr_allocator()) self.assertIsNotNone(wr_stream()) stream = None gc.collect() self.assertIsNone(wr_stream()) self.assertIsNone(wr_camconfig()) self.assertIsNone(wr_streamconfig()) class SimpleCaptureMethods(CameraTesterBase): def test_blocking(self): cm = self.cm cam = self.cam camconfig = cam.generate_configuration([libcam.StreamRole.StillCapture]) self.assertTrue(camconfig.size == 1) streamconfig = camconfig.at(0) fmts = streamconfig.formats self.assertIsNotNone(fmts) fmts = None ret = cam.configure(camconfig) self.assertZero(ret) stream = streamconfig.stream allocator = libcam.FrameBufferAllocator(cam) ret = allocator.allocate(stream) self.assertTrue(ret > 0) num_bufs = len(allocator.buffers(stream)) reqs = [] for i in range(num_bufs): req = cam.create_request(i) self.assertIsNotNone(req) buffer = allocator.buffers(stream)[i] ret = req.add_buffer(stream, buffer) self.assertZero(ret) reqs.append(req) buffer = None ret = cam.start() self.assertZero(ret) for req in reqs: ret = cam.queue_request(req) self.assertZero(ret) reqs = None gc.collect() reqs = [] while True: ready_reqs = cm.get_ready_requests() reqs += ready_reqs if len(reqs) == num_bufs: break for i, req in enumerate(reqs): self.assertTrue(i == req.cookie) reqs = None gc.collect() ret = cam.stop() self.assertZero(ret) def test_select(self): cm = self.cm cam = self.cam camconfig = cam.generate_configuration([libcam.StreamRole.StillCapture]) self.assertTrue(camconfig.size == 1) streamconfig = camconfig.at(0) fmts = streamconfig.formats self.assertIsNotNone(fmts) fmts = None ret = cam.configure(camconfig) self.assertZero(ret) stream = streamconfig.stream allocator = libcam.FrameBufferAllocator(cam) ret = allocator.allocate(stream) self.assertTrue(ret > 0) num_bufs = len(allocator.buffers(stream)) reqs = [] for i in range(num_bufs): req = cam.create_request(i) self.assertIsNotNone(req) buffer = allocator.buffers(stream)[i] ret = req.add_buffer(stream, buffer) self.assertZero(ret) reqs.append(req) buffer = None ret = cam.start() self.assertZero(ret) for req in reqs: ret = cam.queue_request(req) self.assertZero(ret) reqs = None gc.collect() sel = selectors.DefaultSelector() sel.register(cm.event_fd, selectors.EVENT_READ) reqs = [] running = True while running: events = sel.select() for key, _ in events: ready_reqs = cm.get_ready_requests() reqs += ready_reqs if len(reqs) == num_bufs: running = False self.assertTrue(len(reqs) == num_bufs) for i, req in enumerate(reqs): self.assertTrue(i == req.cookie) reqs = None gc.collect() ret = cam.stop() self.assertZero(ret) # Recursively expand slist's objects into olist, using seen to track already # processed objects. def _getr(slist, olist, seen): for e in slist: if id(e) in seen: continue seen.add(id(e)) olist.append(e) tl = gc.get_referents(e) if tl: _getr(tl, olist, seen) def get_all_objects(ignored=[]): gcl = gc.get_objects() olist = [] seen = set() seen.add(id(gcl)) seen.add(id(olist)) seen.add(id(seen)) seen.update(set([id(o) for o in ignored])) _getr(gcl, olist, seen) return olist def create_type_count_map(olist): map = defaultdict(int) for o in olist: map[type(o)] += 1 return map def diff_type_count_maps(before, after): return [(k, after[k] - before[k]) for k in after if after[k] != before[k]] if __name__ == '__main__': # \todo This is an attempt to see the Python objects that are not collected, # but this doesn't work very well, as things always leak a bit. test_leaks = False if test_leaks: gc.unfreeze() gc.collect() obs_before = get_all_objects() unittest.main(exit=False) if test_leaks: gc.unfreeze() gc.collect() obs_after = get_all_objects([obs_before]) # type: ignore before = create_type_count_map(obs_before) # type: ignore after = create_type_count_map(obs_after) leaks = diff_type_count_maps(before, after) if len(leaks) > 0: print(leaks)