kopia lustrzana https://github.com/sh123/codec2_talkie
198 wiersze
7.4 KiB
Java
198 wiersze
7.4 KiB
Java
package com.radio.codec2talkie.transport;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.media.AudioAttributes;
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import android.media.AudioFormat;
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import android.media.AudioRecord;
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import android.media.AudioTrack;
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import android.media.MediaRecorder;
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import android.os.Debug;
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import android.util.Log;
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import androidx.preference.PreferenceManager;
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import com.radio.codec2talkie.settings.PreferenceKeys;
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import com.radio.codec2talkie.tools.AudioTools;
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import com.radio.codec2talkie.tools.BitTools;
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import com.radio.codec2talkie.tools.DebugTools;
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import com.ustadmobile.codec2.Codec2;
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import java.io.IOException;
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import java.nio.BufferOverflowException;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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public class SoundModem implements Transport, Runnable {
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private static final String TAG = SoundModem.class.getSimpleName();
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// NOTE, codec2 library requires that sample_rate % bit_rate == 0
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public static final int AUDIO_SAMPLE_SIZE = 24000;
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private final String _name;
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private AudioTrack _systemAudioPlayer;
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private AudioRecord _systemAudioRecorder;
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private final short[] _recordAudioBuffer;
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private final byte[] _recordBitBuffer;
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private final short[] _playbackAudioBuffer;
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private final byte[] _playbackBitBuffer;
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private final int _samplesPerSymbol;
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private final ByteBuffer _bitBuffer;
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private final Context _context;
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private final SharedPreferences _sharedPreferences;
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private boolean _isRunning = true;
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private final boolean _loopbackTest = false;
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private final long _fskModem;
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public SoundModem(Context context) {
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_context = context;
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_sharedPreferences = PreferenceManager.getDefaultSharedPreferences(_context);
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String type = _sharedPreferences.getString(PreferenceKeys.PORTS_SOUND_MODEM_TYPE, "1200");
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_name = "SoundModem" + type;
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if (type.equals("300")) {
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_fskModem = Codec2.fskCreate(AUDIO_SAMPLE_SIZE, 300, 1600, 200);
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} else {
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_fskModem = Codec2.fskCreate(AUDIO_SAMPLE_SIZE, 1200, 1200, 1000);
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}
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_recordAudioBuffer = new short[Codec2.fskDemodSamplesBufSize(_fskModem)];
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_recordBitBuffer = new byte[Codec2.fskDemodBitsBufSize(_fskModem)];
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_playbackAudioBuffer = new short[Codec2.fskModSamplesBufSize(_fskModem)];
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_playbackBitBuffer = new byte[Codec2.fskModBitsBufSize(_fskModem)];
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_samplesPerSymbol = Codec2.fskSamplesPerSymbol(_fskModem);
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_bitBuffer = ByteBuffer.allocate(10 * _recordBitBuffer.length);
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constructSystemAudioDevices();
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if (!_loopbackTest)
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new Thread(this).start();
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}
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private void constructSystemAudioDevices() {
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int audioRecorderMinBufferSize = AudioRecord.getMinBufferSize(
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AUDIO_SAMPLE_SIZE,
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AudioFormat.CHANNEL_IN_MONO,
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AudioFormat.ENCODING_PCM_16BIT);
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int audioSource = MediaRecorder.AudioSource.MIC;
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_systemAudioRecorder = new AudioRecord(
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audioSource,
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AUDIO_SAMPLE_SIZE,
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AudioFormat.CHANNEL_IN_MONO,
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AudioFormat.ENCODING_PCM_16BIT,
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audioRecorderMinBufferSize);
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int audioPlayerMinBufferSize = AudioTrack.getMinBufferSize(
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AUDIO_SAMPLE_SIZE,
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AudioFormat.CHANNEL_OUT_MONO,
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AudioFormat.ENCODING_PCM_16BIT);
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_systemAudioRecorder.startRecording();
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int usage = AudioAttributes.USAGE_MEDIA;
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_systemAudioPlayer = new AudioTrack.Builder()
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.setAudioAttributes(new AudioAttributes.Builder()
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.setUsage(usage)
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.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
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.build())
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.setAudioFormat(new AudioFormat.Builder()
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.setEncoding(AudioFormat.ENCODING_PCM_16BIT)
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.setSampleRate(AUDIO_SAMPLE_SIZE)
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.setChannelMask(AudioFormat.CHANNEL_OUT_MONO)
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.build())
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.setTransferMode(AudioTrack.MODE_STREAM)
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.setBufferSizeInBytes(audioPlayerMinBufferSize)
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.build();
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_systemAudioPlayer.setVolume(AudioTrack.getMaxVolume());
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_systemAudioPlayer.play();
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}
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@Override
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public String name() {
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return _name;
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}
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@Override
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public int read(byte[] data) throws IOException {
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synchronized (_bitBuffer) {
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if (_bitBuffer.position() > 0) {
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_bitBuffer.flip();
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int len = _bitBuffer.remaining();
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_bitBuffer.get(data, 0, len);
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//Log.i(TAG, "read " + DebugTools.byteBitsToString(data));
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_bitBuffer.compact();
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return len;
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}
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}
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return 0;
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}
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@Override
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public int write(byte[] srcDataBytesAsBits) throws IOException {
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byte[] dataBytesAsBits = BitTools.convertToNRZI(srcDataBytesAsBits);
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if (_loopbackTest) {
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Log.i(TAG, "write " + DebugTools.byteBitsToString(srcDataBytesAsBits));
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_bitBuffer.put(BitTools.convertFromNRZI(dataBytesAsBits, (byte) 0));
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}
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int j = 0;
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for (int i = 0; i < dataBytesAsBits.length; i++, j++) {
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if (j >= _playbackBitBuffer.length) {
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Codec2.fskModulate(_fskModem, _playbackAudioBuffer, _playbackBitBuffer);
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_systemAudioPlayer.write(_playbackAudioBuffer, 0, _playbackAudioBuffer.length);
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j = 0;
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}
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_playbackBitBuffer[j] = dataBytesAsBits[i];
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}
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// process tail
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byte [] bitBufferTail = Arrays.copyOf(_playbackBitBuffer, j);
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Codec2.fskModulate(_fskModem, _playbackAudioBuffer, bitBufferTail);
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_systemAudioPlayer.write(_playbackAudioBuffer, 0, bitBufferTail.length * _samplesPerSymbol);
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return 0;
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}
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@Override
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public void close() throws IOException {
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Log.i(TAG, "close()");
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_isRunning = false;
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_systemAudioRecorder.stop();
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_systemAudioPlayer.stop();
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_systemAudioRecorder.release();
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_systemAudioPlayer.release();
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Codec2.fskDestroy(_fskModem);
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}
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@Override
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public void run() {
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byte prevLastBit = 0;
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while (_isRunning) {
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// TODO, take readCnt into account, do not read if playback is active
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int readCnt = _systemAudioRecorder.read(_recordAudioBuffer, 0, Codec2.fskNin(_fskModem));
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//Log.i(TAG, "! " + AudioTools.getSampleLevelDb(Arrays.copyOf(_recordAudioBuffer, Codec2.fskNin(_fskModem))));
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//Log.i(TAG, DebugTools.shortsToHex(_recordAudioBuffer));
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//Log.i(TAG, readCnt + " " + _recordAudioBuffer.length + " " + Codec2.fskNin(_fskModem));
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Codec2.fskDemodulate(_fskModem, _recordAudioBuffer, _recordBitBuffer);
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//Log.i(TAG, "-- " + DebugTools.byteBitsToString(_recordBitBuffer));
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//Log.i(TAG, "== " + DebugTools.byteBitsToString(BitTools.convertFromNRZI(_recordBitBuffer, prevLastBit)));
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synchronized (_bitBuffer) {
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try {
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_bitBuffer.put(BitTools.convertFromNRZI(_recordBitBuffer, prevLastBit));
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prevLastBit = _recordBitBuffer[_recordBitBuffer.length - 1];
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} catch (BufferOverflowException e) {
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e.printStackTrace();
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_bitBuffer.clear();
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}
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}
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}
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}
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}
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