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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// Audio encoders
#ifndef _AUDIO_ENCODER_H
#define _AUDIO_ENCODER_H
#include "twinkle_config.h"
#include "audio_codecs.h"
#include "user.h"
#ifdef HAVE_GSM
#include <gsm/gsm.h>
#else
#include "gsm/inc/gsm.h"
#endif
#ifdef HAVE_SPEEX
#include <speex/speex.h>
#endif
#ifdef HAVE_BCG729
extern "C" {
# include <bcg729/encoder.h>
}
#endif
#ifdef HAVE_ILBC
#ifndef HAVE_ILBC_CPP
extern "C" {
#endif
#include <ilbc/iLBC_define.h>
#ifndef HAVE_ILBC_CPP
}
#endif
#endif
// Abstract definition of an audio encoder
class t_audio_encoder {
protected:
t_audio_codec _codec;
uint16 _payload_id; // payload id for the codec
uint16 _ptime; // in milliseconds
uint16 _max_payload_size; // maximum size of payload
t_user *_user_config;
t_audio_encoder(uint16 payload_id, uint16 ptime, t_user *user_config);
public:
virtual ~t_audio_encoder() {};
t_audio_codec get_codec(void) const;
uint16 get_payload_id(void) const;
uint16 get_ptime(void) const;
uint16 get_sample_rate(void) const;
uint16 get_max_payload_size(void) const;
// Encode a 16-bit PCM sample buffer to a encoded payload
// Returns the number of bytes written into the payload.
// The silence flag indicates if the returned sound samples represent silence
// that may be suppressed.
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence) = 0;
};
// G.711 A-law
class t_g711a_audio_encoder : public t_audio_encoder {
public:
t_g711a_audio_encoder(uint16 payload_id, uint16 ptime, t_user *user_config);
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
};
// G.711 u-law
class t_g711u_audio_encoder : public t_audio_encoder {
public:
t_g711u_audio_encoder(uint16 payload_id, uint16 ptime, t_user *user_config);
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
};
// GSM
class t_gsm_audio_encoder : public t_audio_encoder {
private:
gsm gsm_encoder;
public:
t_gsm_audio_encoder(uint16 payload_id, uint16 ptime, t_user *user_config);
virtual ~t_gsm_audio_encoder();
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
};
#ifdef HAVE_SPEEX
class t_speex_audio_encoder : public t_audio_encoder {
public:
enum t_mode {
MODE_NB, // Narrow band
MODE_WB, // Wide band
MODE_UWB // Ultra wide band
};
private:
SpeexBits speex_bits;
void *speex_enc_state;
t_mode _mode;
public:
t_speex_audio_encoder(uint16 payload_id, uint16 ptime, t_mode mode,
t_user *user_config);
virtual ~t_speex_audio_encoder();
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
};
#endif
#ifdef HAVE_ILBC
class t_ilbc_audio_encoder : public t_audio_encoder {
private:
iLBC_Enc_Inst_t _ilbc_encoder;
uint8 _mode; // 20, 30 ms (frame size)
public:
t_ilbc_audio_encoder(uint16 payload_id, uint16 ptime,
t_user *user_config);
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
};
#endif
class t_g726_audio_encoder : public t_audio_encoder {
public:
enum t_bit_rate {
BIT_RATE_16,
BIT_RATE_24,
BIT_RATE_32,
BIT_RATE_40
};
private:
uint16 encode_16(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size);
uint16 encode_24(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size);
uint16 encode_32(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size);
uint16 encode_40(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size);
g72x_state _state;
t_bit_rate _bit_rate;
t_g726_packing _packing;
public:
t_g726_audio_encoder(uint16 payload_id, uint16 ptime, t_bit_rate bit_rate,
t_user *user_config);
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
};
#ifdef HAVE_BCG729
class t_g729a_audio_encoder : public t_audio_encoder
{
public:
t_g729a_audio_encoder(uint16 payload_id, uint16 ptime, t_user *user_config);
virtual ~t_g729a_audio_encoder();
virtual uint16 encode(int16 *sample_buf, uint16 nsamples,
uint8 *payload, uint16 payload_size, bool &silence);
private:
bcg729EncoderChannelContextStruct* _context;
};
#endif
#endif
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