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encoder-gsm.cc

/*
 * Copyright (c) 1995 The Regents of the University of California.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the Network Research
 *    Group at Lawrence Berkeley National Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
static const char rcsid[] =
    "@(#) $Header: encoder-gsm.cc,v 1.7 96/03/16 13:12:50 van Exp $ (LBL)";

#include <string.h>
#include "config.h"
#include "rtp.h"
#include "encoder.h"
#include "transmitter.h"
extern "C" {
#include "gsm.h"
}

class GSMEncoder : public PCM_Encoder {
    public:
      GSMEncoder();
      virtual void encode(u_int32_t ts, u_int8_t* samples, int cc);
    protected:
      gsm_state tstate_;
};

static class GSMEncoderMatcher : public Matcher {
    public:
      GSMEncoderMatcher() : Matcher("encoder") {}
      TclObject* match(const char* fmt) {
            if (strcasecmp(fmt, "gsm") == 0)
                  return (new GSMEncoder);
            else
                  return (0);
      }
} gsm_encoder_matcher;


GSMEncoder::GSMEncoder()
{
      Vat_Gsm_InitS(&tstate_);
}

void GSMEncoder::encode(u_int32_t ts, u_int8_t* frame, int len)
{
      register int marker = (ts != last_ts_) ? htons(RTP_M) : 0;
      last_ts_ = ts + len;

      Transmitter::pktbuf* pb = tx_->alloc(ts, RTP_PT_GSM);
      rtphdr* rh = (rtphdr*)pb->hdr;
      rh->rh_flags |= marker;
      pb->iov[0].iov_len = sizeof(rtphdr);
      gsm_byte* o = (gsm_byte*)pb->iov[1].iov_base;
      for (u_int8_t* ep = frame + len; frame < ep; frame += FRAMESIZE) {
            Vat_Gsm_Encoder(&tstate_, frame, o);
            o += 33;
      }
      pb->iov[1].iov_len = o - (gsm_byte*)pb->iov[1].iov_base;
      tx_->send(pb);
}

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