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/**
* @file amr.c Adaptive Multi-Rate (AMR) audio codec
*
* Copyright (C) 2010 Creytiv.com
*/
#include <stdlib.h>
#ifdef AMR_NB
#include <interf_enc.h>
#include <interf_dec.h>
#endif
#ifdef AMR_WB
#ifdef _TYPEDEF_H
#define typedef_h
#endif
#include <enc_if.h>
#include <dec_if.h>
#endif
#include <re.h>
#include <baresip.h>
#include "amr.h"
#ifdef VO_AMRWBENC_ENC_IF_H
#define IF2E_IF_encode E_IF_encode
#define IF2D_IF_decode D_IF_decode
#endif
/**
* @defgroup amr amr
*
* This module supports both AMR Narrowband (8000 Hz) and
* AMR Wideband (16000 Hz) audio codecs.
*
* NOTE: only octet-align mode is supported.
*
*
* Reference:
*
* http://tools.ietf.org/html/rfc4867
*
* http://www.penguin.cz/~utx/amr
*/
#ifndef L_FRAME16k
#define L_FRAME16k 320
#endif
#ifndef NB_SERIAL_MAX
#define NB_SERIAL_MAX 61
#endif
enum {
FRAMESIZE_NB = 160
};
struct auenc_state {
const struct aucodec *ac;
void *enc; /**< Encoder state */
};
struct audec_state {
const struct aucodec *ac;
void *dec; /**< Decoder state */
};
static void encode_destructor(void *arg)
{
struct auenc_state *st = arg;
switch (st->ac->srate) {
#ifdef AMR_NB
case 8000:
Encoder_Interface_exit(st->enc);
break;
#endif
#ifdef AMR_WB
case 16000:
E_IF_exit(st->enc);
break;
#endif
}
}
static void decode_destructor(void *arg)
{
struct audec_state *st = arg;
switch (st->ac->srate) {
#ifdef AMR_NB
case 8000:
Decoder_Interface_exit(st->dec);
break;
#endif
#ifdef AMR_WB
case 16000:
D_IF_exit(st->dec);
break;
#endif
}
}
static int encode_update(struct auenc_state **aesp,
const struct aucodec *ac,
struct auenc_param *prm, const char *fmtp)
{
struct auenc_state *st;
int err = 0;
(void)prm;
(void)fmtp;
if (!aesp || !ac)
return EINVAL;
if (*aesp)
return 0;
st = mem_zalloc(sizeof(*st), encode_destructor);
if (!st)
return ENOMEM;
st->ac = ac;
switch (ac->srate) {
#ifdef AMR_NB
case 8000:
st->enc = Encoder_Interface_init(0);
break;
#endif
#ifdef AMR_WB
case 16000:
st->enc = E_IF_init();
break;
#endif
}
if (!st->enc)
err = ENOMEM;
if (err)
mem_deref(st);
else
*aesp = st;
return err;
}
static int decode_update(struct audec_state **adsp,
const struct aucodec *ac, const char *fmtp)
{
struct audec_state *st;
int err = 0;
(void)fmtp;
if (!adsp || !ac)
return EINVAL;
if (*adsp)
return 0;
st = mem_zalloc(sizeof(*st), decode_destructor);
if (!st)
return ENOMEM;
st->ac = ac;
switch (ac->srate) {
#ifdef AMR_NB
case 8000:
st->dec = Decoder_Interface_init();
break;
#endif
#ifdef AMR_WB
case 16000:
st->dec = D_IF_init();
break;
#endif
}
if (!st->dec)
err = ENOMEM;
if (err)
mem_deref(st);
else
*adsp = st;
return err;
}
#ifdef AMR_WB
static int encode_wb(struct auenc_state *st, uint8_t *buf, size_t *len,
const int16_t *sampv, size_t sampc)
{
int n;
if (sampc != L_FRAME16k)
return EINVAL;
if (*len < NB_SERIAL_MAX)
return ENOMEM;
/* CMR value 15 indicates that no mode request is present */
buf[0] = 15 << 4;
n = IF2E_IF_encode(st->enc, 8, sampv, &buf[1], 0);
if (n <= 0)
return EPROTO;
*len = (1 + n);
return 0;
}
static int decode_wb(struct audec_state *st, int16_t *sampv, size_t *sampc,
const uint8_t *buf, size_t len)
{
if (*sampc < L_FRAME16k)
return ENOMEM;
if (len > NB_SERIAL_MAX)
return EINVAL;
IF2D_IF_decode(st->dec, &buf[1], sampv, 0);
*sampc = L_FRAME16k;
return 0;
}
#endif
#ifdef AMR_NB
static int encode_nb(struct auenc_state *st, uint8_t *buf,
size_t *len, const int16_t *sampv, size_t sampc)
{
int r;
if (!st || !buf || !len || !sampv || sampc != FRAMESIZE_NB)
return EINVAL;
if (*len < NB_SERIAL_MAX)
return ENOMEM;
/* CMR value 15 indicates that no mode request is present */
buf[0] = 15 << 4;
r = Encoder_Interface_Encode(st->enc, MR122, sampv, &buf[1], 0);
if (r <= 0)
return EPROTO;
*len = (1 + r);
return 0;
}
static int decode_nb(struct audec_state *st, int16_t *sampv,
size_t *sampc, const uint8_t *buf, size_t len)
{
if (!st || !sampv || !sampc || !buf)
return EINVAL;
if (len > NB_SERIAL_MAX)
return EPROTO;
if (*sampc < L_FRAME16k)
return ENOMEM;
Decoder_Interface_Decode(st->dec, &buf[1], sampv, 0);
*sampc = FRAMESIZE_NB;
return 0;
}
#endif
#ifdef AMR_WB
static struct aucodec amr_wb = {
LE_INIT, NULL, "AMR-WB", 16000, 16000, 1, NULL,
encode_update, encode_wb,
decode_update, decode_wb,
NULL, amr_fmtp_enc, amr_fmtp_cmp
};
#endif
#ifdef AMR_NB
static struct aucodec amr_nb = {
LE_INIT, NULL, "AMR", 8000, 8000, 1, NULL,
encode_update, encode_nb,
decode_update, decode_nb,
NULL, amr_fmtp_enc, amr_fmtp_cmp
};
#endif
static int module_init(void)
{
int err = 0;
#ifdef AMR_WB
aucodec_register(baresip_aucodecl(), &amr_wb);
#endif
#ifdef AMR_NB
aucodec_register(baresip_aucodecl(), &amr_nb);
#endif
return err;
}
static int module_close(void)
{
#ifdef AMR_WB
aucodec_unregister(&amr_wb);
#endif
#ifdef AMR_NB
aucodec_unregister(&amr_nb);
#endif
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(amr) = {
"amr",
"codec",
module_init,
module_close
};
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