| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef LINEARITY_TEST_H |
| #define LINEARITY_TEST_H |
| |
| /* There are numSignals int16 signals in pcms. sampleCounts is an |
| integer array of length numSignals containing their respective |
| lengths in samples. They are all sampled at sampleRate. The pcms |
| are ordered by increasing stimulus level. The level steps between |
| successive stimuli were of size dbStepSize dB. The signal with |
| index referenceStim (0 <= referenceStim < numSignals) should be in |
| an amplitude range that is reasonably certain to be linear (e.g. at |
| normal speaking levels). The maximum deviation in linearity found |
| (in dB) is returned in maxDeviation. The function returns 1 if |
| the measurements could be made, or a negative number that |
| indicates the error, as follows: |
| -1 The input signals or sample counts are missing. |
| -2 The number of input signals is < 2. |
| -3 The specified sample rate is <= 4000.0 |
| -4 The dB step size for the increase in stimulus level is <= 0.0/ |
| -5 The specified reverence stimulus number is out of range. |
| -6 One or more of the stimuli is too short in duration. */ |
| int linearityTest(short** pcms, int* sampleCounts, int numSignals, |
| float sampleRate, float dbStepSize, |
| int referenceStim, float* maxDeviation); |
| |
| |
| #endif /* LINEARITY_TEST_H */ |
