| /* |
| * 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 OVERFLOW_CHECK_H |
| #define OVERFLOW_CHECK_H |
| |
| /* This is a clipping/overflow check. This is designed to look for a |
| ~3-second duration ~250 Hz pure tone at a level sufficient to cause |
| about 20% clipping. It examines the recorded waveform for possible |
| overflow/wraparound. The input signal of numSamples total sampled at |
| sampleRate is in pcm. The expected signal contains silence - tone - |
| silence. The approximate duration in seconds of the tone found is |
| returned in duration. The number of unexpectedly-large jumps within |
| the tone is returned in numDeltas. The approximate sample numbers of |
| the tone endpoints are returned in onset and offset. The maximum |
| and minimum found in the signal located between onset and offset are |
| returned in maxPeak and minPeak, respectively. The function |
| return is 1 if the operation was sucessful, 0 on failure. */ |
| int overflowCheck(short* pcm, int numSamples, float sampleRate, |
| float* duration, int* numDeltas, int* onset, int* offset, |
| int* maxPeak, int* minPeak); |
| |
| #endif // OVERFLOW_CHECK_H |
