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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, see <https://www.gnu.org/licenses/>.
*/
// Audio decoders
#ifndef _AUDIO_DECODER_H
#define _AUDIO_DECODER_H
#include "twinkle_config.h"
#include "audio_codecs.h"
#include "user.h"
#ifdef HAVE_GSM
extern "C" {
#include <gsm/gsm.h>
}
#else
#include "gsm/inc/gsm.h"
#endif
#ifdef HAVE_SPEEX
#include <speex/speex.h>
#include <speex/speex_preprocess.h>
#endif
#ifdef HAVE_BCG729
extern "C" {
# include <bcg729/decoder.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 decoder
class t_audio_decoder {
protected:
t_audio_codec _codec;
uint16 _default_ptime;
bool _plc; // packet loss concealment
t_user *_user_config;
t_audio_decoder(uint16 default_ptime, bool plc, t_user *user_config);
public:
virtual ~t_audio_decoder() {};
t_audio_codec get_codec(void) const;
uint16 get_default_ptime(void) const;
virtual uint16 get_ptime(uint16 payload_size) const = 0;
// Decode a buffer of encoded samples to 16-bit PCM.
// Returns the number of pcm samples written into pcm_buf
// Returns 0 if decoding failed
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size) = 0;
// Indicates if codec has PLC algorithm
bool has_plc(void) const;
// Create a payload to conceal a lost packet.
// Returns the number of pcm samples written into pcm_buf
// Returns 0 if decoding failed
virtual uint16 conceal(int16 *pcm_buf, uint16 pcm_buf_size);
// Determine if the payload size is valid for this decoder
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const = 0;
};
// G.711 A-law
class t_g711a_audio_decoder : public t_audio_decoder {
public:
t_g711a_audio_decoder(uint16 default_ptime, t_user *user_config);
virtual uint16 get_ptime(uint16 payload_size) const;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size);
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const;
};
// G.711 u-law
class t_g711u_audio_decoder : public t_audio_decoder {
public:
t_g711u_audio_decoder(uint16 default_ptime, t_user *user_config);
virtual uint16 get_ptime(uint16 payload_size) const;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size);
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const;
};
// GSM
class t_gsm_audio_decoder : public t_audio_decoder {
private:
gsm gsm_decoder;
public:
t_gsm_audio_decoder(t_user *user_config);
virtual ~t_gsm_audio_decoder();
virtual uint16 get_ptime(uint16 payload_size) const;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size);
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const;
};
#ifdef HAVE_SPEEX
// Speex
class t_speex_audio_decoder : public t_audio_decoder {
public:
enum t_mode {
MODE_NB, // Narrow band
MODE_WB, // Wide band
MODE_UWB // Ultra wide band
};
private:
SpeexBits speex_bits;
void *speex_dec_state;
t_mode _mode;
public:
t_speex_audio_decoder(t_mode mode, t_user *user_config);
virtual ~t_speex_audio_decoder();
virtual uint16 get_ptime(uint16 payload_size) const;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size);
virtual uint16 conceal(int16 *pcm_buf, uint16 pcm_buf_size);
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const;
};
#endif
#ifdef HAVE_ILBC
// iLBC
class t_ilbc_audio_decoder : public t_audio_decoder {
private:
iLBC_Dec_Inst_t _ilbc_decoder_20; // decoder for 20ms frames
iLBC_Dec_Inst_t _ilbc_decoder_30; // decoder for 30ms frames
// The number of ms received in the last frame, so the conceal function
// can determine which decoder to use to conceal a lost frame.
int _last_received_ptime;
public:
t_ilbc_audio_decoder(uint16 default_ptime, t_user *user_config);
virtual uint16 get_ptime(uint16 payload_size) const;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size);
virtual uint16 conceal(int16 *pcm_buf, uint16 pcm_buf_size);
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const;
};
#endif
// G.726
class t_g726_audio_decoder : public t_audio_decoder {
public:
enum t_bit_rate {
BIT_RATE_16,
BIT_RATE_24,
BIT_RATE_32,
BIT_RATE_40
};
private:
uint16 decode_16(uint8 *payload, uint16 payload_size, int16 *pcm_buf, uint16 pcm_buf_size);
uint16 decode_24(uint8 *payload, uint16 payload_size, int16 *pcm_buf, uint16 pcm_buf_size);
uint16 decode_32(uint8 *payload, uint16 payload_size, int16 *pcm_buf, uint16 pcm_buf_size);
uint16 decode_40(uint8 *payload, uint16 payload_size, int16 *pcm_buf, uint16 pcm_buf_size);
struct g72x_state _state;
t_bit_rate _bit_rate;
uint8 _bits_per_sample;
t_g726_packing _packing;
public:
t_g726_audio_decoder(t_bit_rate bit_rate, uint16 default_ptime, t_user *user_config);
virtual uint16 get_ptime(uint16 payload_size) const;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size);
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const;
};
#ifdef HAVE_BCG729
// G.729A
class t_g729a_audio_decoder : public t_audio_decoder {
public:
t_g729a_audio_decoder(uint16 default_ptime, t_user *user_config);
~t_g729a_audio_decoder();
virtual uint16 get_ptime(uint16 payload_size) const override;
virtual uint16 decode(uint8 *payload, uint16 payload_size,
int16 *pcm_buf, uint16 pcm_buf_size) override;
virtual bool valid_payload_size(uint16 payload_size, uint16 sample_buf_size) const override;
virtual uint16 conceal(int16 *pcm_buf, uint16 pcm_buf_size) override;
private:
bcg729DecoderChannelContextStruct* _context;
};
#endif
#endif
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