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conference.h

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    speexcodec.cpp 4.76 KiB
    /*
     *  Copyright (C) 2007-2009 Savoir-Faire Linux inc.
     *  Author: Alexandre Savard <alexandre.savard@savoirfairelinux.com>
     *  Author: Emmanuel Milou <emmanuel.milou@savoirfairelinux.com>
     *
     *  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 3 of the License, or
     *  (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
     */
    
    #include "audiocodec.h"
    #include <cstdio>
    #include <speex/speex.h>
    #include <speex/speex_preprocess.h>
    
    class Speex : public AudioCodec{
        public:
            Speex(int payload=0)
                : AudioCodec(payload, "speex"),
                _speexModePtr(NULL),
                _speex_dec_bits(),
                _speex_enc_bits(),
                _speex_dec_state(),
                _speex_enc_state(),
                _speex_frame_size(),
                _preprocess_state()
        {
            _clockRate = 8000;
            _channel = 1;
            _bitrate = 0;
            _bandwidth = 0; 
            initSpeex();
        }
    
            Speex( const Speex& );
            Speex& operator=(const Speex&);
    
            void initSpeex() { 
    
                // 8000 HZ --> Narrow-band mode
                // TODO Manage the other modes
                _speexModePtr = &speex_nb_mode; 
    
                // Init the decoder struct
                speex_bits_init(&_speex_dec_bits);
                _speex_dec_state = speex_decoder_init(_speexModePtr);      
    
                // Init the encoder struct
                speex_bits_init(&_speex_enc_bits);
                _speex_enc_state = speex_encoder_init(_speexModePtr);
    
    #if ENABLE_SPEEXDSP
    
                int enable = 1;
                int quality = 10;
                int complex = 10;
                int attenuation = -10;
    
                speex_encoder_ctl(_speex_enc_state, SPEEX_SET_VAD, &enable);
                speex_encoder_ctl(_speex_enc_state, SPEEX_SET_DTX, &enable);
                speex_encoder_ctl(_speex_enc_state, SPEEX_SET_VBR_QUALITY, &quality);
                speex_encoder_ctl(_speex_enc_state, SPEEX_SET_COMPLEXITY, &complex);
    
                // Init the decoder struct
                speex_decoder_ctl(_speex_dec_state, SPEEX_GET_FRAME_SIZE, &_speex_frame_size);
    
                // Init the preprocess struct
                _preprocess_state = speex_preprocess_state_init(_speex_frame_size,_clockRate);
                speex_preprocess_ctl(_preprocess_state, SPEEX_PREPROCESS_SET_DENOISE, &enable);
                speex_preprocess_ctl(_preprocess_state, SPEEX_PREPROCESS_SET_NOISE_SUPPRESS, &attenuation);
                speex_preprocess_ctl(_preprocess_state, SPEEX_PREPROCESS_SET_VAD, &enable);
                speex_preprocess_ctl(_preprocess_state, SPEEX_PREPROCESS_SET_AGC, &enable);
    #endif
    
            }
    
            ~Speex() 
            {
                terminateSpeex();
            }
    
            void terminateSpeex() {
                // Destroy the decoder struct
                speex_bits_destroy(&_speex_dec_bits);
                speex_decoder_destroy(_speex_dec_state);
                _speex_dec_state = 0;
    
                // Destroy the encoder struct
                speex_bits_destroy(&_speex_enc_bits);
                speex_encoder_destroy(_speex_enc_state);
                _speex_enc_state = 0;
            }
    
            virtual int codecDecode (short *dst, unsigned char *src, unsigned int size) 
            {
                int ratio = 320 / _speex_frame_size;
                speex_bits_read_from(&_speex_dec_bits, (char*)src, size);
                speex_decode_int(_speex_dec_state, &_speex_dec_bits, dst);
    
                return _speex_frame_size * ratio; 
            }
    
            virtual int codecEncode (unsigned char *dst, short *src, unsigned int size) 
            {
                speex_bits_reset(&_speex_enc_bits);
    
    #if ENABLE_SPEEXDSP
                speex_encoder_ctl(_speex_enc_state,SPEEX_SET_SAMPLING_RATE,&_clockRate);
                speex_preprocess_run(_preprocess_state, src);
    #endif
    
                speex_encode_int(_speex_enc_state, src, &_speex_enc_bits);
                int nbBytes = speex_bits_write(&_speex_enc_bits, (char*)dst, size); 
                return nbBytes;
            }
    
        private:
            const SpeexMode* _speexModePtr;
            SpeexBits  _speex_dec_bits;
            SpeexBits  _speex_enc_bits;
            void *_speex_dec_state;
            void *_speex_enc_state;
            int _speex_frame_size;
            SpeexPreprocessState *_preprocess_state;
    };
    
    // the class factories
    extern "C" AudioCodec* create() {
        return new Speex(110);
    }
    
    extern "C" void destroy(AudioCodec* a) {
        delete a;
    }