# Copyright 2013 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 os
import os.path
import sys
import re
import json
import tempfile
import time
import unittest
import subprocess
import math
def int_to_rational(i):
"""Function to convert Python integers to Camera2 rationals.
Args:
i: Python integer or list of integers.
Returns:
Python dictionary or list of dictionaries representing the given int(s)
as rationals with denominator=1.
"""
if isinstance(i, list):
return [{"numerator":val, "denominator":1} for val in i]
else:
return {"numerator":i, "denominator":1}
def float_to_rational(f, denom=128):
"""Function to convert Python floats to Camera2 rationals.
Args:
f: Python float or list of floats.
denom: (Optonal) the denominator to use in the output rationals.
Returns:
Python dictionary or list of dictionaries representing the given
float(s) as rationals.
"""
if isinstance(f, list):
return [{"numerator":math.floor(val*denom+0.5), "denominator":denom}
for val in f]
else:
return {"numerator":math.floor(f*denom+0.5), "denominator":denom}
def rational_to_float(r):
"""Function to convert Camera2 rational objects to Python floats.
Args:
r: Rational or list of rationals, as Python dictionaries.
Returns:
Float or list of floats.
"""
if isinstance(r, list):
return [float(val["numerator"]) / float(val["denominator"])
for val in r]
else:
return float(r["numerator"]) / float(r["denominator"])
def manual_capture_request(
sensitivity, exp_time, f_distance = 0.0, linear_tonemap=False, props=None):
"""Return a capture request with everything set to manual.
Uses identity/unit color correction, and the default tonemap curve.
Optionally, the tonemap can be specified as being linear.
Args:
sensitivity: The sensitivity value to populate the request with.
exp_time: The exposure time, in nanoseconds, to populate the request
with.
f_distance: The focus distance to populate the request with.
linear_tonemap: [Optional] whether a linear tonemap should be used
in this request.
props: [Optional] the object returned from
its.device.get_camera_properties(). Must present when
linear_tonemap is True.
Returns:
The default manual capture request, ready to be passed to the
its.device.do_capture function.
"""
req = {
"android.control.captureIntent": 6,
"android.control.mode": 0,
"android.control.aeMode": 0,
"android.control.awbMode": 0,
"android.control.afMode": 0,
"android.control.effectMode": 0,
"android.sensor.frameDuration": 0,
"android.sensor.sensitivity": sensitivity,
"android.sensor.exposureTime": exp_time,
"android.colorCorrection.mode": 0,
"android.colorCorrection.transform":
int_to_rational([1,0,0, 0,1,0, 0,0,1]),
"android.colorCorrection.gains": [1,1,1,1],
"android.lens.focusDistance" : f_distance,
"android.tonemap.mode": 1,
"android.shading.mode": 1,
"android.lens.opticalStabilizationMode": 0
}
if linear_tonemap:
assert(props is not None)
#CONTRAST_CURVE mode
if 0 in props["android.tonemap.availableToneMapModes"]:
req["android.tonemap.mode"] = 0
req["android.tonemap.curveRed"] = [0.0,0.0, 1.0,1.0]
req["android.tonemap.curveGreen"] = [0.0,0.0, 1.0,1.0]
req["android.tonemap.curveBlue"] = [0.0,0.0, 1.0,1.0]
#GAMMA_VALUE mode
elif 3 in props["android.tonemap.availableToneMapModes"]:
req["android.tonemap.mode"] = 3
req["android.tonemap.gamma"] = 1.0
else:
print "Linear tonemap is not supported"
assert(False)
return req
def auto_capture_request():
"""Return a capture request with everything set to auto.
"""
return {
"android.control.mode": 1,
"android.control.aeMode": 1,
"android.control.awbMode": 1,
"android.control.afMode": 1,
"android.colorCorrection.mode": 1,
"android.tonemap.mode": 1,
"android.lens.opticalStabilizationMode": 0
}
def fastest_auto_capture_request(props):
"""Return an auto capture request for the fastest capture.
Args:
props: the object returned from its.device.get_camera_properties().
Returns:
A capture request with everything set to auto and all filters that
may slow down capture set to OFF or FAST if possible
"""
req = auto_capture_request()
turn_slow_filters_off(props, req)
return req
def get_available_output_sizes(fmt, props, max_size=None, match_ar_size=None):
"""Return a sorted list of available output sizes for a given format.
Args:
fmt: the output format, as a string in
["jpg", "yuv", "raw", "raw10", "raw12"].
props: the object returned from its.device.get_camera_properties().
max_size: (Optional) A (w,h) tuple.
Sizes larger than max_size (either w or h) will be discarded.
match_ar_size: (Optional) A (w,h) tuple.
Sizes not matching the aspect ratio of match_ar_size will be
discarded.
Returns:
A sorted list of (w,h) tuples (sorted large-to-small).
"""
AR_TOLERANCE = 0.03
fmt_codes = {"raw":0x20, "raw10":0x25, "raw12":0x26,"yuv":0x23,
"jpg":0x100, "jpeg":0x100}
configs = props['android.scaler.streamConfigurationMap']\
['availableStreamConfigurations']
fmt_configs = [cfg for cfg in configs if cfg['format'] == fmt_codes[fmt]]
out_configs = [cfg for cfg in fmt_configs if cfg['input'] == False]
out_sizes = [(cfg['width'],cfg['height']) for cfg in out_configs]
if max_size:
out_sizes = [s for s in out_sizes if
s[0] <= max_size[0] and s[1] <= max_size[1]]
if match_ar_size:
ar = match_ar_size[0] / float(match_ar_size[1])
out_sizes = [s for s in out_sizes if
abs(ar - s[0] / float(s[1])) <= AR_TOLERANCE]
out_sizes.sort(reverse=True, key=lambda s: s[0]) # 1st pass, sort by width
out_sizes.sort(reverse=True, key=lambda s: s[0]*s[1]) # sort by area
return out_sizes
def set_filter_off_or_fast_if_possible(props, req, available_modes, filter):
"""Check and set controlKey to off or fast in req.
Args:
props: the object returned from its.device.get_camera_properties().
req: the input request. filter will be set to OFF or FAST if possible.
available_modes: the key to check available modes.
filter: the filter key
Returns:
Nothing.
"""
if props.has_key(available_modes):
if 0 in props[available_modes]:
req[filter] = 0
elif 1 in props[available_modes]:
req[filter] = 1
def turn_slow_filters_off(props, req):
"""Turn filters that may slow FPS down to OFF or FAST in input request.
This function modifies the request argument, such that filters that may
reduce the frames-per-second throughput of the camera device will be set to
OFF or FAST if possible.
Args:
props: the object returned from its.device.get_camera_properties().
req: the input request.
Returns:
Nothing.
"""
set_filter_off_or_fast_if_possible(props, req,
"android.noiseReduction.availableNoiseReductionModes",
"android.noiseReduction.mode")
set_filter_off_or_fast_if_possible(props, req,
"android.colorCorrection.availableAberrationModes",
"android.colorCorrection.aberrationMode")
if props.has_key("android.request.availableCharacteristicsKeys"):
hot_pixel_modes = 393217 in props["android.request.availableCharacteristicsKeys"]
edge_modes = 196610 in props["android.request.availableCharacteristicsKeys"]
if props.has_key("android.request.availableRequestKeys"):
hot_pixel_mode = 393216 in props["android.request.availableRequestKeys"]
edge_mode = 196608 in props["android.request.availableRequestKeys"]
if hot_pixel_modes and hot_pixel_mode:
set_filter_off_or_fast_if_possible(props, req,
"android.hotPixel.availableHotPixelModes",
"android.hotPixel.mode")
if edge_modes and edge_mode:
set_filter_off_or_fast_if_possible(props, req,
"android.edge.availableEdgeModes",
"android.edge.mode")
def get_fastest_manual_capture_settings(props):
"""Return a capture request and format spec for the fastest capture.
Args:
props: the object returned from its.device.get_camera_properties().
Returns:
Two values, the first is a capture request, and the second is an output
format specification, for the fastest possible (legal) capture that
can be performed on this device (with the smallest output size).
"""
fmt = "yuv"
size = get_available_output_sizes(fmt, props)[-1]
out_spec = {"format":fmt, "width":size[0], "height":size[1]}
s = min(props['android.sensor.info.sensitivityRange'])
e = min(props['android.sensor.info.exposureTimeRange'])
req = manual_capture_request(s,e)
turn_slow_filters_off(props, req)
return req, out_spec
def get_smallest_yuv_format(props, match_ar=None):
"""Return a capture request and format spec for the smallest yuv size.
Args:
props: the object returned from its.device.get_camera_properties().
Returns:
fmt: an output format specification, for the smallest possible yuv
format for this device.
"""
size = get_available_output_sizes("yuv", props, match_ar_size=match_ar)[-1]
fmt = {"format":"yuv", "width":size[0], "height":size[1]}
return fmt
def get_largest_yuv_format(props):
"""Return a capture request and format spec for the smallest yuv size.
Args:
props: the object returned from its.device.get_camera_properties().
Returns:
fmt: an output format specification, for the smallest possible yuv
format for this device.
"""
size = get_available_output_sizes("yuv", props)[0]
fmt = {"format":"yuv", "width":size[0], "height":size[1]}
return fmt
def get_max_digital_zoom(props):
"""Returns the maximum amount of zooming possible by the camera device.
Args:
props: the object returned from its.device.get_camera_properties().
Return:
A float indicating the maximum amount of zooming possible by the
camera device.
"""
maxz = 1.0
if props.has_key("android.scaler.availableMaxDigitalZoom"):
maxz = props["android.scaler.availableMaxDigitalZoom"]
return maxz
class __UnitTest(unittest.TestCase):
"""Run a suite of unit tests on this module.
"""
def test_int_to_rational(self):
"""Unit test for int_to_rational.
"""
self.assertEqual(int_to_rational(10),
{"numerator":10,"denominator":1})
self.assertEqual(int_to_rational([1,2]),
[{"numerator":1,"denominator":1},
{"numerator":2,"denominator":1}])
def test_float_to_rational(self):
"""Unit test for float_to_rational.
"""
self.assertEqual(float_to_rational(0.5001, 64),
{"numerator":32, "denominator":64})
def test_rational_to_float(self):
"""Unit test for rational_to_float.
"""
self.assertTrue(
abs(rational_to_float({"numerator":32,"denominator":64})-0.5)
< 0.0001)
if __name__ == '__main__':
unittest.main()