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//
// File : gsmcodec.cpp
// Creation date : Wed Aug 22 19:12:55 2001 GMT by Szymon Stefanek
//
// This file is part of the KVirc irc client distribution
// Copyright (C) 2001 Szymon Stefanek (pragma at kvirc dot net)
//
// 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 2
// of the License, or (at your opinion) 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, write to the Free Software Foundation,
// Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
#define _GSMCODEC_CPP_
#include "gsmcodec.h"
#ifdef COMPILE_USE_GSM
#include <dlfcn.h>
#define GSM_PACKED_FRAME_SIZE_IN_BYTES 33
#define GSM_UNPACKED_FRAME_SIZE_IN_BYTES 320
#define GSM_UNPACKED_FRAME_SIZE_IN_SHORTS 160
void * (*gsm_session_create)() = 0;
void (*gsm_session_destroy)(void *) = 0;
void (*gsm_session_encode)(void *,short *,unsigned char *) = 0;
int (*gsm_session_decode)(void *,unsigned char *,short *) = 0;
void * g_pGSMCodecLibraryHandle = 0;
bool kvi_gsm_codec_init()
{
if(g_pGSMCodecLibraryHandle)return true; // Already initialized
g_pGSMCodecLibraryHandle = dlopen("libgsm.so",RTLD_NOW | RTLD_GLOBAL);
if(!g_pGSMCodecLibraryHandle)return false; // no way to open it
gsm_session_create = (void * (*)()) dlsym(g_pGSMCodecLibraryHandle,"gsm_create");
gsm_session_destroy = (void (*)(void *)) dlsym(g_pGSMCodecLibraryHandle,"gsm_destroy");
gsm_session_encode = (void (*)(void *,short *,unsigned char *)) dlsym(g_pGSMCodecLibraryHandle,"gsm_encode");
gsm_session_decode = (int (*)(void *,unsigned char *,short *)) dlsym(g_pGSMCodecLibraryHandle,"gsm_decode");
if(! (gsm_session_create && gsm_session_destroy && gsm_session_encode && gsm_session_decode))
{
dlclose(g_pGSMCodecLibraryHandle);
g_pGSMCodecLibraryHandle = 0;
return false;
}
return true;
}
void kvi_gsm_codec_done()
{
if(g_pGSMCodecLibraryHandle)
{
dlclose(g_pGSMCodecLibraryHandle);
g_pGSMCodecLibraryHandle = 0;
}
}
KviDccVoiceGsmCodec::KviDccVoiceGsmCodec()
: KviDccVoiceCodec()
{
m_pEncodeState = gsm_session_create();
m_pDecodeState = gsm_session_create();
m_szName = "gsm (compression 33:320)";
}
KviDccVoiceGsmCodec::~KviDccVoiceGsmCodec()
{
gsm_session_destroy(m_pEncodeState);
gsm_session_destroy(m_pDecodeState);
}
void KviDccVoiceGsmCodec::encode(KviDataBuffer * signal,KviDataBuffer * stream)
{
if(signal->size() < GSM_UNPACKED_FRAME_SIZE_IN_BYTES)return; // nothing to encode
unsigned char * ptr = signal->data();
int uFrames = signal->size() / GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
int uTotalDataCompressed = uFrames * GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
int uFrameOffset = stream->size();
unsigned char * endPtr = ptr + uTotalDataCompressed;
stream->addSize(GSM_PACKED_FRAME_SIZE_IN_BYTES * uFrames);
while(ptr != endPtr)
{
gsm_session_encode(m_pEncodeState,(short *)ptr,stream->data() + uFrameOffset);
ptr += GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
uFrameOffset += GSM_PACKED_FRAME_SIZE_IN_BYTES;
}
signal->remove(uTotalDataCompressed);
}
void KviDccVoiceGsmCodec::decode(KviDataBuffer * stream,KviDataBuffer * signal)
{
if(stream->size() < GSM_PACKED_FRAME_SIZE_IN_BYTES)return; // nothing to decode
unsigned char * ptr = stream->data();
// Gsm codec
int uFrames = stream->size() / GSM_PACKED_FRAME_SIZE_IN_BYTES;
int uTotalDataDecompressed = uFrames * GSM_PACKED_FRAME_SIZE_IN_BYTES;
int uSignalOffset = signal->size();
unsigned char * endPtr = ptr + (uTotalDataDecompressed);
signal->addSize(GSM_UNPACKED_FRAME_SIZE_IN_BYTES * uFrames);
while(ptr != endPtr)
{
// We don't check the return value here
// Well..it is either an unrecoverable internal error
// or a broken frame...
// but if we receive broken frames over DCC...well....better
// check the hardware...or the remote codec as well...
gsm_session_decode(m_pDecodeState,ptr,(short *)(signal->data() + uSignalOffset));
ptr += GSM_PACKED_FRAME_SIZE_IN_BYTES;
uSignalOffset += GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
}
stream->remove(uTotalDataDecompressed);
}
int KviDccVoiceGsmCodec::encodedFrameSize()
{
return GSM_PACKED_FRAME_SIZE_IN_BYTES;
}
int KviDccVoiceGsmCodec::decodedFrameSize()
{
return GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
}
#endif // COMPILE_USE_GSM
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