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/*
* Copyright 2008 Free Software Foundation, Inc.
*
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* This software is distributed under the terms of the GNU Public License.
* See the COPYING file in the main directory for details.
*/
#ifndef GSML1FEC_H
#define GSML1FEC_H
//#include "Threads.h"
#include "Assert.h"
#include "BitVector.h"
#include "GSMCommon.h"
//#include "GSMTransfer.h"
#include "GSMTDMA.h"
#include "VocoderFrame.h"
#include "RxBurst.h"
//#include "GSM610Tables.h"
#include <stdio.h>
namespace GSM
{
//class SAPMux;
class L1FEC;
class L1Decoder;
/*
Naming convention for bit vectors follows GSM 05.03 Section 2.2.
d[k] data
u[k] data bits after first encoding step
c[k] data bits after second encoding step
i[B][k] interleaved data bits
e[B][k] bits in a burst
*/
/** L1 decoder used for full rate TCH and FACCH -- mostly from GSM 05.03 3.1 and 4.2 */
//: public XCCHL1Decoder
class TCHFACCHL1Decoder
{
protected:
SoftVector mI[8]; ///< deinterleaving history, 8 blocks instead of 4
SoftVector mC; ///< c[], as per GSM 05.03 2.2
BitVector mTCHU; ///< u[] (uncoded) in the spec
BitVector mTCHD; ///< d[] (data) in the spec
SoftVector mClass1_c; ///< the class 1 part of c[]
BitVector mClass1A_d; ///< the class 1A part of d[]
SoftVector mClass2_c; ///< the class 2 part of c[]
ViterbiR2O4 mVCoder;
VocoderFrame mVFrame; ///< unpacking buffer for vocoder frame
unsigned char mPrevGoodFrame[33]; ///< previous good frame.
Parity mTCHParity;
const TDMAMapping& mMapping; ///< multiplexing description
// InterthreadQueue<unsigned char> mSpeechQ; ///< output queue for speech frames
static const unsigned mMaxQSize = 3;
public:
TCHFACCHL1Decoder( const TDMAMapping& wMapping );
ChannelType channelType() const {
return FACCHType;
}
/** TCH/FACCH has a special-case writeLowSide. */
void writeLowSide(const RxBurst& inBurst);
/**
Unlike other DCCHs, TCH/FACCH process burst calls
deinterleave, decode, handleGoodFrame.
*/
bool processBurst( const RxBurst& );
/** Deinterleave i[] to c[]. */
void deinterleave(int blockOffset );
void replaceFACCH( int blockOffset );
/**
Decode a traffic frame from TCHI[] and enqueue it.
Return true if there's a good frame.
*/
bool decodeTCH(bool stolen);
unsigned char * get_voice_frame(){
return mPrevGoodFrame;
}
/**
Receive a traffic frame.
Non-blocking. Returns NULL if queue is dry.
Caller is responsible for deleting the returned array.
*/
// unsigned char *recvTCH() { return mSpeechQ.read(0); }
/** Return count of internally-queued traffic frames. */
// unsigned queueSize() const { return mSpeechQ.size(); }
};
}; // namespace GSM
#endif
// vim: ts=4 sw=4
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