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# Copyright 2014 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import its.device
import its.caps
import its.objects
import its.target
def main():
"""Test the AE state machine when using the precapture trigger.
"""
INACTIVE = 0
SEARCHING = 1
CONVERGED = 2
LOCKED = 3
FLASHREQUIRED = 4
PRECAPTURE = 5
with its.device.ItsSession() as cam:
props = cam.get_camera_properties()
if not its.caps.compute_target_exposure(props):
print "Test skipped"
return
_,fmt = its.objects.get_fastest_manual_capture_settings(props)
# Capture 5 manual requests, with AE disabled, and the last request
# has an AE precapture trigger (which should be ignored since AE is
# disabled).
manual_reqs = []
e, s = its.target.get_target_exposure_combos(cam)["midExposureTime"]
manual_req = its.objects.manual_capture_request(s,e)
manual_req['android.control.aeMode'] = 0 # Off
manual_reqs += [manual_req]*4
precap_req = its.objects.manual_capture_request(s,e)
precap_req['android.control.aeMode'] = 0 # Off
precap_req['android.control.aePrecaptureTrigger'] = 1 # Start
manual_reqs.append(precap_req)
caps = cam.do_capture(manual_reqs, fmt)
for cap in caps:
assert(cap['metadata']['android.control.aeState'] == INACTIVE)
# Capture an auto request and verify the AE state; no trigger.
auto_req = its.objects.auto_capture_request()
auto_req['android.control.aeMode'] = 1 # On
cap = cam.do_capture(auto_req, fmt)
state = cap['metadata']['android.control.aeState']
print "AE state after auto request:", state
assert(state in [SEARCHING, CONVERGED])
# Capture with auto request with a precapture trigger.
auto_req['android.control.aePrecaptureTrigger'] = 1 # Start
cap = cam.do_capture(auto_req, fmt)
state = cap['metadata']['android.control.aeState']
print "AE state after auto request with precapture trigger:", state
assert(state in [SEARCHING, CONVERGED, PRECAPTURE])
# Capture some more auto requests, and AE should converge.
auto_req['android.control.aePrecaptureTrigger'] = 0
caps = cam.do_capture([auto_req]*5, fmt)
state = caps[-1]['metadata']['android.control.aeState']
print "AE state after auto request:", state
assert(state == CONVERGED)
if __name__ == '__main__':
main()
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