ilbccodec.cxx

sloedgy open sip stack source code

/*
 * ilbccodec.cxx
 *
 * Internet Low Bitrate Codec
 *
 * Open H323 Library
 *
 * Copyright (c) 2003 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Open H323 Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: ilbccodec.cxx,v $
 * Revision 1.1  2006/06/26 03:02:35  joegenbaclor
 * I have decided to include the latest development realease  of OPAL tagged Deimos Devel 1 (June 8 2006) as inegrated classes to opensipstack to avoid future version conflicts due to the fast pace in OPAL development.   This move is also aimed to reduce the size of projects using OPAL componets such as the soon to be relased OpenSIPPhone.
 *
 * Revision 2.8  2005/12/27 20:44:30  dsandras
 * Use the encoding name only for the default version of the codec.
 *
 * Revision 2.7  2005/11/20 21:03:10  dsandras
 * Fixed format name.
 *
 * Revision 2.6  2005/08/28 07:59:17  rjongbloed
 * Converted OpalTranscoder to use factory, requiring sme changes in making sure
 *   OpalMediaFormat instances are initialised before use.
 *
 * Revision 2.5  2005/05/25 17:05:17  dsandras
 * Fixed iLBC codec, thanks Robert!
 *
 * Revision 2.4  2005/02/21 12:19:54  rjongbloed
 * Added new "options list" to the OpalMediaFormat class.
 *
 * Revision 2.3  2004/09/01 12:21:27  rjongbloed
 * Added initialisation of H323EndPoints capability table to be all codecs so can
 *   correctly build remote caps from fqast connect params. This had knock on effect
 *   with const keywords added in numerous places.
 *
 * Revision 2.2  2004/03/11 06:54:28  csoutheren
 * Added ability to disable SIP or H.323 stacks
 *
 * Revision 2.1  2004/02/19 10:47:02  rjongbloed
 * Merged OpenH323 version 1.13.1 changes.
 *
 * Revision 1.2  2004/01/27 12:44:01  csoutheren
 * Fixed incorrect initialisation in iLBC codec initializer
 *   Thanks to Borko Jandras
 *
 * Revision 1.1  2003/06/06 02:19:12  rjongbloed
 * Added iLBC codec
 *
 */

#include <ptlib.h>

#ifdef __GNUC__
#pragma implementation "ilbccodec.h"
#endif

#include <codec/ilbccodec.h>

extern "C" {
#include "iLBC/iLBC_encode.h" 
#include "iLBC/iLBC_decode.h" 
};
    

#define new PNEW


const OpalAudioFormat & GetOpal_iLBC_13k3()
{
  static const OpalAudioFormat iLBC_13k3(
    OPAL_ILBC_13k3,
    RTP_DataFrame::DynamicBase,
    "iLBC",
    NO_OF_BYTES_30MS,
    BLOCKL_30MS,
    7, 3);
  return iLBC_13k3;
}


const OpalAudioFormat & GetOpal_iLBC_15k2()
{
  static const OpalAudioFormat iLBC_15k2(
    OPAL_ILBC_15k2,
    RTP_DataFrame::DynamicBase,
    OPAL_ILBC_15k2,
    NO_OF_BYTES_20MS,
    BLOCKL_20MS,
    7, 4);
  return iLBC_15k2;
}


/////////////////////////////////////////////////////////////////////////////

#ifndef NO_H323

H323_iLBC_Capability::H323_iLBC_Capability(const H323EndPoint & endpoint, Speed s)
  : H323NonStandardAudioCapability(endpoint,
                                   (const BYTE *)(s == e_13k3 ? OPAL_ILBC_13k3 : OPAL_ILBC_15k2))
{
  speed = s;
}


PObject * H323_iLBC_Capability::Clone() const
{
  return new H323_iLBC_Capability(*this);
}


PString H323_iLBC_Capability::GetFormatName() const
{
  return speed == e_13k3 ? OPAL_ILBC_13k3 : OPAL_ILBC_15k2;
}


#endif


/////////////////////////////////////////////////////////////////////////////

Opal_iLBC_Decoder::Opal_iLBC_Decoder(const OpalMediaFormat & inputMediaFormat, int speed)
  : OpalFramedTranscoder(inputMediaFormat, OpalPCM16,
                         speed == 30 ? NO_OF_BYTES_30MS : NO_OF_BYTES_20MS,
                         speed == 30 ? BLOCKL_30MS * 2  : BLOCKL_20MS * 2)
{
  decoder = (struct iLBC_Dec_Inst_t_ *)malloc((unsigned)sizeof(struct iLBC_Dec_Inst_t_));
  if (decoder != NULL) 
    initDecode(decoder, speed, 1); 

  PTRACE(3, "Codec\tiLBC decoder created");
}


Opal_iLBC_Decoder::~Opal_iLBC_Decoder()
{
  if (decoder != NULL)
    free(decoder);
}
 

BOOL Opal_iLBC_Decoder::ConvertFrame(const BYTE * src, BYTE * dst)
{
  float block[BLOCKL_MAX];

  /* do actual decoding of block */ 
  iLBC_decode(block, (unsigned char *)src, decoder, 1);

  /* convert to short */     
  for (int i = 0; i < decoder->blockl; i++) {
    float tmp = block[i];
    if (tmp < MIN_SAMPLE)
      tmp = MIN_SAMPLE;
    else if (tmp > MAX_SAMPLE)
      tmp = MAX_SAMPLE;
    ((short *)dst)[i] = (short)tmp;
  }

  return TRUE;
}


Opal_iLBC_13k3_PCM::Opal_iLBC_13k3_PCM()
  : Opal_iLBC_Decoder(Opal_iLBC_13k3, 30)
{
}


Opal_iLBC_15k2_PCM::Opal_iLBC_15k2_PCM()
  : Opal_iLBC_Decoder(Opal_iLBC_15k2, 20)
{
}


Opal_iLBC_Encoder::Opal_iLBC_Encoder(const OpalMediaFormat & outputMediaFormat, int speed)
  : OpalFramedTranscoder(OpalPCM16, outputMediaFormat,
                         speed == 30 ? BLOCKL_30MS * 2  : BLOCKL_20MS * 2,
                         speed == 30 ? NO_OF_BYTES_30MS : NO_OF_BYTES_20MS)
{
    encoder = (struct iLBC_Enc_Inst_t_ *)malloc((unsigned)sizeof(struct iLBC_Enc_Inst_t_));
    if (encoder != 0) 
      initEncode(encoder, speed); 

  PTRACE(3, "Codec\tiLBC encoder created");
}


Opal_iLBC_Encoder::~Opal_iLBC_Encoder()
{
  if (encoder != NULL)
    free(encoder);
}
 

BOOL Opal_iLBC_Encoder::ConvertFrame(const BYTE * src, BYTE * dst)
{
  float block[BLOCKL_MAX];

  /* convert signal to float */
  for (int i = 0; i < encoder->blockl; i++)
    block[i] = (float)((short *)src)[i];

  /* do the actual encoding */
  iLBC_encode(dst, block, encoder);
  return TRUE; 
}


Opal_PCM_iLBC_13k3::Opal_PCM_iLBC_13k3()
  : Opal_iLBC_Encoder(Opal_iLBC_13k3, 30)
{
}


Opal_PCM_iLBC_15k2::Opal_PCM_iLBC_15k2()
  : Opal_iLBC_Encoder(Opal_iLBC_15k2, 20)
{
}


/////////////////////////////////////////////////////////////////////////////