1# Copyright 2013 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15import its.image
16import its.caps
17import its.device
18import its.objects
19import its.target
20
21def main():
22    """Test that the android.sensor.sensitivity parameter is applied properly
23    within a burst. Inspects the output metadata only (not the image data).
24    """
25
26    NUM_STEPS = 3
27    ERROR_TOLERANCE = 0.97 # Allow ISO to be rounded down by 3%
28
29    with its.device.ItsSession() as cam:
30        props = cam.get_camera_properties()
31        its.caps.skip_unless(its.caps.manual_sensor(props) and
32                             its.caps.per_frame_control(props))
33
34        sens_range = props['android.sensor.info.sensitivityRange']
35        sens_step = (sens_range[1] - sens_range[0]) / NUM_STEPS
36        sens_list = range(sens_range[0], sens_range[1], sens_step)
37        e = min(props['android.sensor.info.exposureTimeRange'])
38        reqs = [its.objects.manual_capture_request(s,e) for s in sens_list]
39        _,fmt = its.objects.get_fastest_manual_capture_settings(props)
40
41        caps = cam.do_capture(reqs, fmt)
42        for i,cap in enumerate(caps):
43            s_req = sens_list[i]
44            s_res = cap["metadata"]["android.sensor.sensitivity"]
45            assert(s_req >= s_res)
46            assert(s_res/float(s_req) > ERROR_TOLERANCE)
47
48if __name__ == '__main__':
49    main()
50
51