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speexcodec_nb.cpp

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    speexcodec_nb.cpp 4.37 KiB
    /*
     *  Copyright (C) 2004, 2005, 2006, 2009, 2008, 2009, 2010, 2011 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.
     *
     *  Additional permission under GNU GPL version 3 section 7:
     *
     *  If you modify this program, or any covered work, by linking or
     *  combining it with the OpenSSL project's OpenSSL library (or a
     *  modified version of that library), containing parts covered by the
     *  terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
     *  grants you additional permission to convey the resulting work.
     *  Corresponding Source for a non-source form of such a combination
     *  shall include the source code for the parts of OpenSSL used as well
     *  as that of the covered work.
     */
    
    #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() {
                _clockRate = 8000;
                _frameSize = 160; // samples, 20 ms at 8kHz
                _channel = 1;
                _bitrate = 24;
                _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;
                // _speexModePtr = &speex_wb_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);
    
                speex_encoder_ctl (_speex_enc_state,SPEEX_SET_SAMPLING_RATE,&_clockRate);
    
                speex_decoder_ctl (_speex_dec_state, SPEEX_GET_FRAME_SIZE, &_speex_frame_size);
    
            }
    
            ~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 size in bytes
                return _frameSize * 2;
            }
    
            virtual int codecEncode (unsigned char *dst, short *src, unsigned int size) {
                speex_bits_reset (&_speex_enc_bits);
    
                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;
    };
    
    // the class factories
    extern "C" AudioCodec* create()
    {
        return new Speex (110);
    }
    
    extern "C" void destroy (AudioCodec* a)
    {
        delete a;
    }