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/*
* vxml.cxx
*
* VXML control for for Opal
*
* A H.323 IVR application.
*
* Copyright (C) 2002 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 Portable Windows Library.
*
* The Initial Developer of the Original Code is Equivalence Pty. Ltd.
*
* Contributor(s): ______________________________________.
*
* $Log: opalvxml.cxx,v $
* Revision 1.22 2004/07/15 11:20:38 rjongbloed
* Migrated changes from crs_vxnml_devel branch into main trunk
*
* Revision 1.21 2004/07/15 03:18:00 csoutheren
* Migrated changes from crs_vxnml_devel branch into main trunk
*
* Revision 1.20.2.1 2004/07/07 07:10:11 csoutheren
* Changed to use new factory based PWAVFile
* Removed redundant blocking/unblocking when using G.723.1
*
* Revision 1.20 2004/05/04 23:23:39 csoutheren
* Removed usage of lpc10 and mscodecs
*
* Revision 1.19 2004/05/03 13:21:45 rjongbloed
* Converted everything to be codec plug in freindly
* Removed GSM and G.729 as now plug ins are "the way"!
*
* Revision 1.18 2002/12/10 23:50:25 robertj
* Fixed some tracing issues
*
* Revision 1.17 2002/08/27 02:21:31 craigs
* Added silence detection capability to fake G.723.1codec
*
* Revision 1.16 2002/08/15 04:55:26 robertj
* Fixed shutdown problems with closing vxml session, leaks a thread.
* Fixed potential problems with indirect channel Close() function.
*
* Revision 1.15 2002/08/15 02:19:42 robertj
* Adjusted trace log levels for G.723.1 file codec read/write tracking.
*
* Revision 1.14 2002/08/07 13:53:05 craigs
* Fixed problem with included opalvxml.h thanks to Vladmir Toncar
*
* Revision 1.13 2002/08/06 05:10:59 craigs
* Moved most of stuff to ptclib
*
* Revision 1.12 2002/08/05 09:43:30 robertj
* Added pragma interface/implementation
* Moved virtual into .cxx file
*
* Revision 1.11 2002/07/29 15:10:36 craigs
* Added autodelete option to PlayFile
*
* Revision 1.10 2002/07/29 12:54:42 craigs
* Removed usages of cerr
*
* Revision 1.9 2002/07/18 04:17:12 robertj
* Moved virtuals to source and changed name of G.723.1 file capability
*
* Revision 1.8 2002/07/10 13:16:58 craigs
* Moved some VXML classes from Opal back into PTCLib
* Added ability to repeat outputted data
*
* Revision 1.7 2002/07/09 08:48:41 craigs
* Fixed trace messages
*
* Revision 1.6 2002/07/05 06:34:04 craigs
* Changed comments and trace messages
*
* Revision 1.5 2002/07/03 04:58:13 robertj
* Changed for compatibility with older GNU compilers
*
* Revision 1.4 2002/07/02 06:32:51 craigs
* Added recording functions
*
* Revision 1.3 2002/06/28 02:42:11 craigs
* Fixed problem with G.723.1 file naming conventions
* Fixed problem with incorrect file open mode
*
* Revision 1.2 2002/06/28 01:24:03 robertj
* Fixe dproblem with compiling without expat library.
*
* Revision 1.1 2002/06/27 05:44:11 craigs
* Initial version
*
* Revision 1.2 2002/06/26 09:05:28 csoutheren
* Added ability to utter various "sayas" types within prompts
*
* Revision 1.1 2002/06/26 01:13:53 csoutheren
* Disassociated VXML and Opal/OpenH323 specific elements
*
* Revision 1.2 2002/06/21 08:18:22 csoutheren
* Added start of grammar handling
*
* Revision 1.1 2002/06/20 06:35:44 csoutheren
* Initial version
*
*/
#include <ptlib.h>
#ifdef __GNUC__
#pragma implementation "opalvxml.h"
#endif
#include "opalvxml.h"
#if P_EXPAT
#include <ptclib/delaychan.h>
#include <ptclib/pwavfile.h>
#include <ptclib/memfile.h>
#endif
#include "codecs.h"
#define G7231_SAMPLES_PER_BLOCK 240
#define G7231_BANDWIDTH (6300/100)
///////////////////////////////////////////////////////////////
G7231_File_Capability::G7231_File_Capability()
: H323AudioCapability(8, 4)
{
}
unsigned G7231_File_Capability::GetSubType() const
{
return H245_AudioCapability::e_g7231;
}
PString G7231_File_Capability::GetFormatName() const
{
return "G.723.1{file}";
}
BOOL G7231_File_Capability::OnSendingPDU(H245_AudioCapability & cap, unsigned packetSize) const
{
// set the choice to the correct type
cap.SetTag(GetSubType());
// get choice data
H245_AudioCapability_g7231 & g7231 = cap;
// max number of audio frames per PDU we want to send
g7231.m_maxAl_sduAudioFrames = packetSize;
// enable silence suppression
g7231.m_silenceSuppression = TRUE;
return TRUE;
}
BOOL G7231_File_Capability::OnReceivedPDU(const H245_AudioCapability & cap, unsigned & packetSize)
{
const H245_AudioCapability_g7231 & g7231 = cap;
packetSize = g7231.m_maxAl_sduAudioFrames;
return TRUE;
}
PObject * G7231_File_Capability::Clone() const
{
return new G7231_File_Capability(*this);
}
H323Codec * G7231_File_Capability::CreateCodec(H323Codec::Direction direction) const
{
return new G7231_File_Codec(direction);
}
///////////////////////////////////////////////////////////////
G7231_File_Codec::G7231_File_Codec(Direction dir)
: H323AudioCodec(OPAL_G7231_6k3, dir)
{
lastFrameLen = 4;
}
int G7231_File_Codec::GetFrameLen(int val)
{
static const int frameLen[] = { 24, 20, 4, 1 };
return frameLen[val & 3];
}
BOOL G7231_File_Codec::Read(BYTE * buffer, unsigned & length, RTP_DataFrame &)
{
if (rawDataChannel == NULL)
return FALSE;
if (!rawDataChannel->Read(buffer, 24)) {
PTRACE(1, "G7231WAV\tRead failed");
return FALSE;
}
lastFrameLen = length = G7231_File_Codec::GetFrameLen(buffer[0]);
return TRUE;
}
BOOL G7231_File_Codec::Write(const BYTE * buffer,
unsigned length,
const RTP_DataFrame & /* rtp */,
unsigned & writtenLength)
{
if (rawDataChannel == NULL)
return TRUE;
static const BYTE silence[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0};
// If the length is zero, output silence to the file..
if (length == 0) {
PTRACE(6,"G7231WAV\tZero length frame");
writtenLength = 0;
return rawDataChannel->Write(silence, 24);
}
int writeLen;
switch (buffer[0]&3) {
case 0:
writeLen = 24;
break;
case 1:
writeLen = 20;
break;
case 2:
// Windows Media Player cannot play 4 byte SID (silence) frames.
// So write out a 24 byte frame of silence instead.
PTRACE(5, "G7231WAV\tReplacing SID with 24 byte frame");
writtenLength = 4;
return rawDataChannel->Write(silence, 24);
default :
writeLen = 1;
break;
}
PTRACE(6, "G7231WAV\tFrame length = " <<writeLen);
writtenLength = writeLen;
return rawDataChannel->Write(buffer, writeLen);
}
unsigned G7231_File_Codec::GetBandwidth() const
{
return G7231_BANDWIDTH;
}
BOOL G7231_File_Codec::IsRawDataChannelNative() const
{
return TRUE;
}
unsigned G7231_File_Codec::GetAverageSignalLevel()
{
if (lastFrameLen == 4)
return 0;
else
return UINT_MAX;
}
///////////////////////////////////////////////////////////////
#if P_EXPAT
OpalVXMLSession::OpalVXMLSession(H323Connection * _conn, PTextToSpeech * tts, BOOL autoDelete)
: PVXMLSession(tts, autoDelete), conn(_conn)
{
}
BOOL OpalVXMLSession::Close()
{
BOOL ok = PVXMLSession::Close();
conn->ClearCall();
return ok;
}
#endif
// End of File /////////////////////////////////////////////////////////////
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