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https://github.com/DSheirer/sdrtrunk.git
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71 lines
2.4 KiB
Java
71 lines
2.4 KiB
Java
/*
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* *****************************************************************************
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* Copyright (C) 2014-2022 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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* ****************************************************************************
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*/
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package io.github.dsheirer.buffer;
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/**
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* Base native buffer class.
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*/
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public abstract class AbstractNativeBuffer implements INativeBuffer
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{
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private long mTimestamp;
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private float mSamplesPerMillisecond;
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/**
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* Constructs an instance
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* @param timestamp for the start of this buffer
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* @param samplesPerMillisecond to calculate the time offset of sub-buffers extracted from this native buffer.
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*/
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public AbstractNativeBuffer(long timestamp, float samplesPerMillisecond)
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{
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mTimestamp = timestamp;
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mSamplesPerMillisecond = samplesPerMillisecond;
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}
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/**
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* Timestamp for the start of this buffer
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* @return timestamp in milliseconds
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*/
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@Override
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public long getTimestamp()
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{
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return mTimestamp;
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}
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/**
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* Quantity of samples representing one millisecond of sample data, used for calculating fragment timestamp offsets.
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* @return samples per millisecond count.
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*/
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public float getSamplesPerMillisecond()
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{
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return mSamplesPerMillisecond;
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}
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/**
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* Calculates the timestamp for a samples buffer fragment based on where it is extracted from relative to the
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* native buffer starting timestamp.
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* @param samplesPointer for the start of the fragment. Note: this value will be divided by 2 to account for I/Q sample pairs.
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* @return timestamp adjusted to the fragment or sub-buffer start sample.
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*/
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protected long getFragmentTimestamp(int samplesPointer)
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{
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return getTimestamp() + (long)(samplesPointer / 2 / getSamplesPerMillisecond());
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}
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}
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