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100 lines
3.8 KiB
100 lines
3.8 KiB
# Copyright 2014 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""CameraITS test to measure jitter in camera timestamps."""
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import logging
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import os.path
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import matplotlib
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from matplotlib import pylab
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from mobly import test_runner
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import its_base_test
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import camera_properties_utils
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import capture_request_utils
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import its_session_utils
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_NS_TO_MS = 1.0E-6
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_NAME = os.path.basename(__file__).split('.')[0]
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_NUM_FRAMES = 50
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_START_FRAME = 2 # 1 frame delay to allow faster latency to 1st frame
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_TEST_FPS = 30 # frames per second
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# PASS/FAIL thresholds
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_MIN_AVG_FRAME_DELTA = 30 # at least 30ms delta between frames
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_MAX_INIT_FRAME_DELTA = 100 # no more than 100ms between first 2 frames
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_MAX_VAR_FRAME_DELTA = 0.01 # variance of frame deltas
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_MAX_FRAME_DELTA_JITTER = 0.3 # max ms gap from the average frame delta
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class JitterTest(its_base_test.ItsBaseTest):
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"""Measure jitter in camera timestamps."""
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def test_jitter(self):
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with its_session_utils.ItsSession(
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device_id=self.dut.serial,
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camera_id=self.camera_id,
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hidden_physical_id=self.hidden_physical_id) as cam:
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props = cam.get_camera_properties()
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props = cam.override_with_hidden_physical_camera_props(props)
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camera_properties_utils.skip_unless(
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camera_properties_utils.manual_sensor(props) and
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camera_properties_utils.sensor_fusion(props))
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req, fmt = capture_request_utils.get_fastest_manual_capture_settings(
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props)
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req['android.control.aeTargetFpsRange'] = [_TEST_FPS, _TEST_FPS]
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caps = cam.do_capture([req] * _NUM_FRAMES, [fmt])
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# Log the millisecond delta between the start of each exposure
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tstamps = [c['metadata']['android.sensor.timestamp'] for c in caps]
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if (tstamps[1]-tstamps[0])*_NS_TO_MS > _MAX_INIT_FRAME_DELTA:
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raise AssertionError('Initial frame timestamp delta too great! '
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f'tstamp[1]: {tstamps[1]}ms, '
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f'tstamp[0]: {tstamps[0]}ms, '
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f'ATOL: {_MAX_INIT_FRAME_DELTA}ms')
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deltas = [
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tstamps[i] - tstamps[i-1] for i in range(_START_FRAME, len(tstamps))
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]
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deltas_ms = [d * _NS_TO_MS for d in deltas]
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avg = sum(deltas_ms) / len(deltas_ms)
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var = sum([d * d for d in deltas_ms]) / len(deltas_ms) - avg * avg
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range0 = min(deltas_ms) - avg
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range1 = max(deltas_ms) - avg
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logging.debug('Average: %s', avg)
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logging.debug('Variance: %s', var)
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logging.debug('Jitter range: %s to %s', range0, range1)
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# Draw a plot.
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pylab.plot(range(len(deltas_ms)), deltas_ms)
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pylab.title(_NAME)
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pylab.xlabel('frame number')
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pylab.ylabel('jitter (ms)')
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name = os.path.join(self.log_path, _NAME)
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matplotlib.pyplot.savefig('%s_deltas.png' % (name))
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# Test for pass/fail.
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if avg <= _MIN_AVG_FRAME_DELTA:
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raise AssertionError(f'avg: {avg:.4f}ms, TOL: {_MIN_AVG_FRAME_DELTA}ms')
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if var >= _MAX_VAR_FRAME_DELTA:
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raise AssertionError(f'var: {var:.4f}ms, TOL: {_MAX_VAR_FRAME_DELTA}ms')
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if (abs(range0) >= _MAX_FRAME_DELTA_JITTER or
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abs(range1) >= _MAX_FRAME_DELTA_JITTER):
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raise AssertionError(f'range0: {range0:.4f}ms, range1: {range1:.4f}ms, '
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f'TOL: {_MAX_FRAME_DELTA_JITTER}')
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if __name__ == '__main__':
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test_runner.main()
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