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https://github.com/DSheirer/sdrtrunk.git
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Initial commit of redesigned internal processing and audio management.
Note: Several of the decoders are currently non-functioning in this commit. If you want the latest functioning codebase, please checkout the commit prior to this one. All decoders will eventually be updated with this new architecture. Currently broken: - Logging and recording - Aux decoders (Fleetsync/MDC/LoJack/Tait) - LTR/Passport decoders Changes in this commit: - Module architecture for decoders and components with central provisioning by the DecoderFactory - Transition from Complex sample stream processing to float buffer processing for improved memory management - Redesigned filter structures - to support buffers and streams - Resolved several memory leak issues - Universal sharing of the thread pool manager - Added centralized audio management with call/user prioritization and new gui with mute/volume controls - Embedded audio metadata for eventual streaming support - Redesigned ProcessingChain to support independent re-use - Added new TrafficChannelManager to handle traffic channel allocations - Traffic Channel pool size and Call timeout available in P25 and MPT1327 configs - Redesigned channel and decoder gui components
This commit is contained in:
denny
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src/module/decode/mdc1200/MDCDecoder.java
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src/module/decode/mdc1200/MDCDecoder.java
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014 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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package module.decode.mdc1200;
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import instrument.Instrumentable;
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import instrument.tap.Tap;
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import instrument.tap.stream.BinaryTap;
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import instrument.tap.stream.FloatBufferTap;
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import instrument.tap.stream.FloatTap;
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import java.util.ArrayList;
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import java.util.List;
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import module.decode.Decoder;
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import module.decode.DecoderType;
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import sample.Listener;
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import sample.real.IRealBufferListener;
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import sample.real.RealBuffer;
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import alias.AliasList;
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import bits.MessageFramer;
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import bits.SyncPattern;
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import dsp.NRZDecoder;
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import dsp.filter.Filters;
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import dsp.filter.fir.real.RealFIRFilter_RB_RB;
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import dsp.filter.halfband.real.HalfBandFilter_RB_RB;
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import dsp.fsk.FSK2Decoder;
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import dsp.fsk.FSK2Decoder.Output;
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/**
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* MDC1200 Decoder - 1200 baud 2FSK decoder that can process 48k sample rate
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* complex or floating point samples and output fully framed MDC1200 messages
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*/
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public class MDCDecoder extends Decoder implements IRealBufferListener,
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Instrumentable
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{
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/* Decimated sample rate ( 48,000 / 2 = 24,000 ) feeding the decoder */
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private static final int sDECIMATED_SAMPLE_RATE = 24000;
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/* Baud or Symbol Rate */
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private static final int sSYMBOL_RATE = 1200;
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/* Message length */
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private static final int sMESSAGE_LENGTH = 304;
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/* Instrumentation Taps */
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private ArrayList<Tap> mAvailableTaps;
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private static final String INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD =
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"Tap Point: Bandpass Filter > < FSK2 Decoder";
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private static final String INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER =
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"Tap Point: FSK2 Decoder > < NRZI Decoder";
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private static final String INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER =
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"Tap Point: NRZ Decoder > < Message Framer";
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private FSK2Decoder mFSKDecoder;
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private HalfBandFilter_RB_RB mDecimationFilter;
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private RealFIRFilter_RB_RB mBandPassFilter;
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private NRZDecoder mNRZDecoder;
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private MessageFramer mMessageFramer;
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private MDCMessageProcessor mMessageProcessor;
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public MDCDecoder( AliasList aliasList )
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{
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super( new MDCDecoderState( aliasList ) );
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/* Decimation filter: 48000 / 2 = 24000 */
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mDecimationFilter = new HalfBandFilter_RB_RB(
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Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO.getCoefficients(), 1.0f, true );
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/* Bandpass filter - predefined */
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mBandPassFilter = new RealFIRFilter_RB_RB(
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Filters.FIRBP_1200FSK_24000FS.getCoefficients(), 1.02f );
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mDecimationFilter.setListener( mBandPassFilter );
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/* 2FSK Decoder */
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mFSKDecoder = new FSK2Decoder( sDECIMATED_SAMPLE_RATE,
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sSYMBOL_RATE, Output.NORMAL );
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mBandPassFilter.setListener( mFSKDecoder );
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/* NRZ Decoder */
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mNRZDecoder = new NRZDecoder( NRZDecoder.MODE_INVERTED );
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mFSKDecoder.setListener( mNRZDecoder );
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/* Message Framer */
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mMessageFramer = new MessageFramer( SyncPattern.MDC1200.getPattern(),
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sMESSAGE_LENGTH );
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mNRZDecoder.setListener( mMessageFramer );
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/* Message Processor */
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mMessageProcessor = new MDCMessageProcessor( aliasList );
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mMessageFramer.addMessageListener( mMessageProcessor );
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mMessageProcessor.addMessageListener( mMessageBroadcaster );
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}
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public void dispose()
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{
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super.dispose();
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mDecimationFilter.dispose();
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mBandPassFilter.dispose();
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mFSKDecoder.dispose();
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mNRZDecoder.dispose();
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mMessageFramer.dispose();
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mMessageProcessor.dispose();
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}
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/* Instrumentation */
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@Override
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public List<Tap> getTaps()
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{
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if( mAvailableTaps == null )
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{
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mAvailableTaps = new ArrayList<Tap>();
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mAvailableTaps.add(
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new FloatTap( INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD, 0, 0.5f ) );
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mAvailableTaps.addAll( mFSKDecoder.getTaps() );
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mAvailableTaps.add(
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new BinaryTap( INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER, 0, 0.025f ) );
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mAvailableTaps.add(
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new BinaryTap( INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER, 0, 0.025f ) );
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}
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return mAvailableTaps;
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}
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@Override
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public void addTap( Tap tap )
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{
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mFSKDecoder.addTap( tap );
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switch( tap.getName() )
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{
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case INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD:
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/* wire the tap between the bandpass filter and the demod */
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FloatBufferTap floatTap = (FloatBufferTap)tap;
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mBandPassFilter.setListener( floatTap );
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floatTap.setListener( mFSKDecoder );
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break;
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case INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER:
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/* wire between FSK2 decoder and NRZ decoder */
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BinaryTap binTap = (BinaryTap)tap;
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mFSKDecoder.setListener( binTap );
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binTap.setListener( mNRZDecoder );
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break;
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case INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER:
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/* wire between demod and framer */
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BinaryTap binInvTap = (BinaryTap)tap;
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mNRZDecoder.setListener( binInvTap );
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binInvTap.setListener( mMessageFramer );
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break;
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default:
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}
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}
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@Override
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public void removeTap( Tap tap )
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{
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mFSKDecoder.removeTap( tap );
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switch( tap.getName() )
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{
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case INSTRUMENT_BANDPASS_FILTER_TO_FSK2_DEMOD:
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mBandPassFilter.setListener( mFSKDecoder );
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break;
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case INSTRUMENT_FSK2_DECODER_TO_NRZ_DECODER:
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mFSKDecoder.setListener( mNRZDecoder );
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break;
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case INSTRUMENT_NRZI_DECODER_TO_MESSAGE_FRAMER:
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mNRZDecoder.setListener( mMessageFramer );
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break;
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default:
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}
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}
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@Override
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public DecoderType getDecoderType()
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{
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return DecoderType.MDC1200;
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}
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@Override
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public Listener<RealBuffer> getRealBufferListener()
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{
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return mDecimationFilter;
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}
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}
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