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150 lines
4.6 KiB
150 lines
4.6 KiB
//
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// File : gsmcodec.cpp
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// Creation date : Wed Aug 22 19:12:55 2001 GMT by Szymon Stefanek
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//
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// This file is part of the KVirc irc client distribution
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// Copyright (C) 2001 Szymon Stefanek (pragma at kvirc dot net)
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//
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// This program is FREE software. You can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your opinion) any later version.
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//
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// This program is distributed in the HOPE that it will be USEFUL,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, write to the Free Software Foundation,
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// Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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#define _GSMCODEC_CPP_
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#include "gsmcodec.h"
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#ifdef COMPILE_USE_GSM
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#include <dlfcn.h>
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#define GSM_PACKED_FRAME_SIZE_IN_BYTES 33
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#define GSM_UNPACKED_FRAME_SIZE_IN_BYTES 320
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#define GSM_UNPACKED_FRAME_SIZE_IN_SHORTS 160
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void * (*gsm_session_create)() = 0;
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void (*gsm_session_destroy)(void *) = 0;
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void (*gsm_session_encode)(void *,short *,unsigned char *) = 0;
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int (*gsm_session_decode)(void *,unsigned char *,short *) = 0;
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void * g_pGSMCodecLibraryHandle = 0;
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bool kvi_gsm_codec_init()
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{
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if(g_pGSMCodecLibraryHandle)return true; // Already initialized
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g_pGSMCodecLibraryHandle = dlopen("libgsm.so",RTLD_NOW | RTLD_GLOBAL);
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if(!g_pGSMCodecLibraryHandle)return false; // no way to open it
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gsm_session_create = (void * (*)()) dlsym(g_pGSMCodecLibraryHandle,"gsm_create");
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gsm_session_destroy = (void (*)(void *)) dlsym(g_pGSMCodecLibraryHandle,"gsm_destroy");
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gsm_session_encode = (void (*)(void *,short *,unsigned char *)) dlsym(g_pGSMCodecLibraryHandle,"gsm_encode");
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gsm_session_decode = (int (*)(void *,unsigned char *,short *)) dlsym(g_pGSMCodecLibraryHandle,"gsm_decode");
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if(! (gsm_session_create && gsm_session_destroy && gsm_session_encode && gsm_session_decode))
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{
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dlclose(g_pGSMCodecLibraryHandle);
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g_pGSMCodecLibraryHandle = 0;
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return false;
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}
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return true;
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}
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void kvi_gsm_codec_done()
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{
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if(g_pGSMCodecLibraryHandle)
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{
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dlclose(g_pGSMCodecLibraryHandle);
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g_pGSMCodecLibraryHandle = 0;
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}
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}
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KviDccVoiceGsmCodec::KviDccVoiceGsmCodec()
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: KviDccVoiceCodec()
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{
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m_pEncodeState = gsm_session_create();
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m_pDecodeState = gsm_session_create();
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m_szName = "gsm (compression 33:320)";
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}
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KviDccVoiceGsmCodec::~KviDccVoiceGsmCodec()
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{
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gsm_session_destroy(m_pEncodeState);
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gsm_session_destroy(m_pDecodeState);
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}
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void KviDccVoiceGsmCodec::encode(KviDataBuffer * signal,KviDataBuffer * stream)
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{
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if(signal->size() < GSM_UNPACKED_FRAME_SIZE_IN_BYTES)return; // nothing to encode
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unsigned char * ptr = signal->data();
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int uFrames = signal->size() / GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
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int uTotalDataCompressed = uFrames * GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
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int uFrameOffset = stream->size();
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unsigned char * endPtr = ptr + uTotalDataCompressed;
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stream->addSize(GSM_PACKED_FRAME_SIZE_IN_BYTES * uFrames);
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while(ptr != endPtr)
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{
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gsm_session_encode(m_pEncodeState,(short *)ptr,stream->data() + uFrameOffset);
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ptr += GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
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uFrameOffset += GSM_PACKED_FRAME_SIZE_IN_BYTES;
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}
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signal->remove(uTotalDataCompressed);
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}
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void KviDccVoiceGsmCodec::decode(KviDataBuffer * stream,KviDataBuffer * signal)
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{
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if(stream->size() < GSM_PACKED_FRAME_SIZE_IN_BYTES)return; // nothing to decode
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unsigned char * ptr = stream->data();
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// Gsm codec
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int uFrames = stream->size() / GSM_PACKED_FRAME_SIZE_IN_BYTES;
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int uTotalDataDecompressed = uFrames * GSM_PACKED_FRAME_SIZE_IN_BYTES;
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int uSignalOffset = signal->size();
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unsigned char * endPtr = ptr + (uTotalDataDecompressed);
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signal->addSize(GSM_UNPACKED_FRAME_SIZE_IN_BYTES * uFrames);
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while(ptr != endPtr)
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{
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// We don't check the return value here
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// Well..it is either an unrecoverable internal error
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// or a broken frame...
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// but if we receive broken frames over DCC...well....better
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// check the hardware...or the remote codec as well...
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gsm_session_decode(m_pDecodeState,ptr,(short *)(signal->data() + uSignalOffset));
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ptr += GSM_PACKED_FRAME_SIZE_IN_BYTES;
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uSignalOffset += GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
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}
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stream->remove(uTotalDataDecompressed);
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}
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int KviDccVoiceGsmCodec::encodedFrameSize()
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{
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return GSM_PACKED_FRAME_SIZE_IN_BYTES;
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}
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int KviDccVoiceGsmCodec::decodedFrameSize()
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{
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return GSM_UNPACKED_FRAME_SIZE_IN_BYTES;
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}
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#endif // COMPILE_USE_GSM
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