1 files changed, 149 insertions, 0 deletions
diff --git a/src/modules/dcc/gsmcodec.cpp b/src/modules/dcc/gsmcodec.cpp
new file mode 100644
index 00000000..58af1473
--- /dev/null
+++ b/src/modules/dcc/gsmcodec.cpp
@@ -0,0 +1,149 @@
+//
+//   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