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decoder-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: decoder-gsm.cc,v 1.7 96/04/09 01:36:12 van Exp $ (LBL)";

#include "decoder.h"
#include "controller.h"
extern "C" {
#include "gsm.h"
}

class GSMDecoder : public PCM_Decoder {
    public:
      GSMDecoder();
      virtual void recv(const struct rtphdr*, const u_char* frame, int len);
    private:
      int nframes;
      gsm_state rstate_;
};

static class GSMDecoderMatcher : public Matcher {
    public:
      GSMDecoderMatcher() : Matcher("decoder") {}
      TclObject* match(const char* fmt) {
            if (strcasecmp(fmt, "gsm") == 0)
                  return (new GSMDecoder);
            else
                  return (0);
      }
} gsm_decoder_matcher;

GSMDecoder::GSMDecoder()
{
      Vat_Gsm_InitR(&rstate_);
}

void GSMDecoder::recv(const struct rtphdr* rh, const u_int8_t* frame, int len)
{
      if (active()) {
            if (len >= 33 && len <= 8 * 33) {
                  u_char wrkbuf[FRAMESIZE*8];
                  u_char* wp = wrkbuf;
                  int outlen = 0;
                  for (const u_char* ep = frame + len; frame < ep;
                       wp += framesize_, frame += 33) {
                        Vat_Gsm_Decoder(&rstate_, wp, frame);
                        outlen += framesize_;
                  }
                  consume_samples(rh, wrkbuf, outlen);
            }
      }
}

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