239 lines
6.4 KiB
C++
239 lines
6.4 KiB
C++
/**
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* ilbccodec.cpp
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* This file is part of the YATE Project http://YATE.null.ro
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*
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* iLBC codec using iLBC library.
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*
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* Yet Another Telephony Engine - a fully featured software PBX and IVR
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* Copyright (C) 2004-2006 Null Team
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*
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* iLBC codec has been created based on the code sent by Faizan Naqvi (Tili)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) 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. See the
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* 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
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <yatephone.h>
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#include <stdlib.h>
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extern "C" {
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#include "../contrib/ilbc/iLBC_encode.h"
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#include "../contrib/ilbc/iLBC_decode.h"
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}
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using namespace TelEngine;
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namespace { // anonymous
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static TranslatorCaps s_caps20[] = {
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{ 0, 0 },
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{ 0, 0 },
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{ 0, 0 }
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};
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static TranslatorCaps s_caps30[] = {
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{ 0, 0 },
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{ 0, 0 },
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{ 0, 0 }
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};
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static Mutex s_cmutex;
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static int s_count = 0;
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class iLBCFactory : public TranslatorFactory
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{
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public:
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inline iLBCFactory(const TranslatorCaps* caps)
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: m_caps(caps)
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{ }
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virtual const TranslatorCaps* getCapabilities() const
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{ return m_caps; }
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virtual DataTranslator* create(const DataFormat& sFormat, const DataFormat& dFormat);
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private:
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const TranslatorCaps* m_caps;
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};
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class iLBCPlugin : public Plugin
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{
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public:
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iLBCPlugin();
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~iLBCPlugin();
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virtual void initialize() { }
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virtual bool isBusy() const;
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private:
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iLBCFactory* m_ilbc20;
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iLBCFactory* m_ilbc30;
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};
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class iLBCCodec : public DataTranslator
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{
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public:
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iLBCCodec(const char* sFormat, const char* dFormat, bool encoding, int msec);
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~iLBCCodec();
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virtual void Consume(const DataBlock& data, unsigned long timeDelta);
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private:
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bool m_encoding;
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DataBlock m_data;
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iLBC_Enc_Inst_t m_enc;
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iLBC_Dec_Inst_t m_dec;
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int m_mode;
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};
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iLBCCodec::iLBCCodec(const char* sFormat, const char* dFormat, bool encoding, int msec)
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: DataTranslator(sFormat,dFormat), m_encoding(encoding), m_mode(msec)
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{
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Debug(DebugAll,"iLBCCodec::iLBCCodec(\"%s\",\"%s\",%scoding,%d) [%p]",
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sFormat,dFormat, m_encoding ? "en" : "de",msec,this);
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if (encoding) {
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memset(&m_enc,0,sizeof(m_enc));
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initEncode(&m_enc,m_mode);
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}
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else {
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memset(&m_dec,0,sizeof(m_dec));
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initDecode(&m_dec,m_mode,0);
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}
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s_cmutex.lock();
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s_count++;
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s_cmutex.unlock();
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}
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iLBCCodec::~iLBCCodec()
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{
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Debug(DebugAll,"iLBCCodec::~ILBCCodec() [%p]",this);
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s_cmutex.lock();
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s_count--;
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s_cmutex.unlock();
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}
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void iLBCCodec::Consume(const DataBlock& data, unsigned long tStamp)
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{
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// block size in samples per frame, no_bytes frame length in bytes
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int block,no_bytes;
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if (m_mode == 20)
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{
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block = BLOCKL_20MS;
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no_bytes=NO_OF_BYTES_20MS;
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} else {
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block = BLOCKL_30MS;
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no_bytes=NO_OF_BYTES_30MS;
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}
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if (!getTransSource())
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return;
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ref();
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m_data += data;
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DataBlock outdata;
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int frames,consumed;
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if (m_encoding) {
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frames = m_data.length() / (2 * block);
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consumed = frames * 2 * block;
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if (frames) {
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outdata.assign(0,frames*no_bytes);
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unsigned char* d = (unsigned char*)outdata.data();
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const short* s = (const short*)m_data.data();
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for (int i=0; i<frames; i++) {
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// convert one frame data from 16 bit signed linear to float
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float buffer[BLOCKL_MAX];
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for (int j=0; j<block; j++)
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buffer[j] = *s++;
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// and now do the actual encoding directly to outdata
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::iLBC_encode(d,buffer,&m_enc);
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d += no_bytes;
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}
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}
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}
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else {
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frames = m_data.length() / no_bytes;
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consumed = frames * no_bytes;
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if (frames) {
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outdata.assign(0,frames * 2 * block);
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short* d = (short*)outdata.data();
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unsigned char* s = (unsigned char*)m_data.data();
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for (int i=0; i<frames; i++) {
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// decode to a float values buffer
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float buffer[BLOCKL_MAX];
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::iLBC_decode(buffer,s,&m_dec,1);
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s += no_bytes;
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// convert the buffer back to 16 bit integer
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for (int j=0; j<block; j++)
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*d++ = (short)(buffer[j]);
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}
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}
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}
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if (!tStamp)
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tStamp = timeStamp() + (frames * block);
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XDebug("iLBCCodec",DebugAll,"%scoding %d frames of %d input bytes (consumed %d) in %d output bytes",
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m_encoding ? "en" : "de",frames,m_data.length(),consumed,outdata.length());
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if (frames) {
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m_data.cut(-consumed);
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getTransSource()->Forward(outdata,tStamp);
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}
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deref();
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}
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iLBCPlugin::iLBCPlugin()
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: m_ilbc20(0), m_ilbc30(0)
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{
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Output("Loaded module iLBC - based on iLBC library");
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const FormatInfo* f = FormatRepository::addFormat("ilbc20",NO_OF_BYTES_20MS,20000);
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s_caps20[0].src = s_caps20[1].dest = f;
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s_caps20[0].dest = s_caps20[1].src = FormatRepository::getFormat("slin");
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// FIXME: put proper conversion costs
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s_caps20[0].cost = s_caps20[1].cost = 10;
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f = FormatRepository::addFormat("ilbc30",NO_OF_BYTES_30MS,30000);
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s_caps30[0].src = s_caps30[1].dest = f;
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s_caps30[0].dest = s_caps30[1].src = FormatRepository::getFormat("slin");
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// FIXME: put proper conversion costs
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s_caps30[0].cost = s_caps30[1].cost = 9;
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m_ilbc20 = new iLBCFactory(s_caps20);
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m_ilbc30 = new iLBCFactory(s_caps30);
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}
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iLBCPlugin::~iLBCPlugin()
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{
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Output("Unloading module iLBC with %d codecs still in use",s_count);
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TelEngine::destruct(m_ilbc20);
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TelEngine::destruct(m_ilbc30);
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}
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bool iLBCPlugin::isBusy() const
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{
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return (s_count != 0);
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}
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DataTranslator* iLBCFactory::create(const DataFormat& sFormat, const DataFormat& dFormat)
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{
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if (sFormat == "slin") {
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// encoding from slin
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if (dFormat == "ilbc20")
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return new iLBCCodec(sFormat,dFormat,true,20);
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else if (dFormat == "ilbc30")
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return new iLBCCodec(sFormat,dFormat,true,30);
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}
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else if (dFormat == "slin") {
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// decoding to slin
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if (sFormat == "ilbc20")
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return new iLBCCodec(sFormat,dFormat,false,20);
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else if (sFormat == "ilbc30")
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return new iLBCCodec(sFormat,dFormat,false,30);
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}
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return 0;
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}
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INIT_PLUGIN(iLBCPlugin);
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}; // anonymous namespace
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/* vi: set ts=8 sw=4 sts=4 noet: */
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