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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;
}