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/**
* @file isac.c iSAC audio codec
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
#include "isac.h"
/*
* draft-ietf-avt-rtp-isac-04
*/
struct auenc_state {
ISACStruct *inst;
};
struct audec_state {
ISACStruct *inst;
};
static void encode_destructor(void *arg)
{
struct auenc_state *st = arg;
if (st->inst)
WebRtcIsac_Free(st->inst);
}
static void decode_destructor(void *arg)
{
struct audec_state *st = arg;
if (st->inst)
WebRtcIsac_Free(st->inst);
}
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_alloc(sizeof(*st), encode_destructor);
if (!st)
return ENOMEM;
if (WebRtcIsac_Create(&st->inst) < 0) {
err = ENOMEM;
goto out;
}
WebRtcIsac_EncoderInit(st->inst, 0);
if (ac->srate == 32000)
WebRtcIsac_SetEncSampRate(st->inst, kIsacSuperWideband);
out:
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_alloc(sizeof(*st), decode_destructor);
if (!st)
return ENOMEM;
if (WebRtcIsac_Create(&st->inst) < 0) {
err = ENOMEM;
goto out;
}
WebRtcIsac_DecoderInit(st->inst);
if (ac->srate == 32000)
WebRtcIsac_SetDecSampRate(st->inst, kIsacSuperWideband);
out:
if (err)
mem_deref(st);
else
*adsp = st;
return err;
}
static int encode(struct auenc_state *st, uint8_t *buf, size_t *len,
const int16_t *sampv, size_t sampc)
{
WebRtc_Word16 len1, len2;
size_t l;
if (!st || !buf || !len || !sampv || !sampc)
return EINVAL;
/* 10 ms audio blocks */
len1 = WebRtcIsac_Encode(st->inst, sampv, (void *)buf);
len2 = WebRtcIsac_Encode(st->inst, &sampv[sampc/2], (void *)buf);
l = len1 ? len1 : len2;
if (l > *len)
return ENOMEM;
*len = l;
return 0;
}
static int decode(struct audec_state *st, int16_t *sampv,
size_t *sampc, const uint8_t *buf, size_t len)
{
WebRtc_Word16 speechType;
int n;
if (!st || !sampv || !sampc || !buf || !len)
return EINVAL;
n = WebRtcIsac_Decode(st->inst, (void *)buf, len,
(void *)sampv, &speechType);
if (n < 0)
return EPROTO;
if ((size_t)n > *sampc)
return ENOMEM;
*sampc = n;
return 0;
}
static int plc(struct audec_state *st, int16_t *sampv, size_t *sampc)
{
int n;
if (!st || !sampv || !sampc)
return EINVAL;
n = WebRtcIsac_DecodePlc(st->inst, (void *)sampv, 1);
if (n < 0)
return EPROTO;
*sampc = n;
return 0;
}
static struct aucodec isacv[] = {
{
LE_INIT, 0, "isac", 32000, 1, NULL,
encode_update, encode, decode_update, decode, plc, NULL, NULL
},
{
LE_INIT, 0, "isac", 16000, 1, NULL,
encode_update, encode, decode_update, decode, plc, NULL, NULL
}
};
static int module_init(void)
{
unsigned i;
for (i=0; i<ARRAY_SIZE(isacv); i++)
aucodec_register(&isacv[i]);
return 0;
}
static int module_close(void)
{
int i = ARRAY_SIZE(isacv);
while (i--)
aucodec_unregister(&isacv[i]);
return 0;
}
/** Module exports */
EXPORT_SYM const struct mod_export DECL_EXPORTS(isac) = {
"isac",
"codec",
module_init,
module_close
};
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