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/**
* @file codec2.c CODEC2 audio codec
*
* Copyright (C) 2015 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <codec2/codec2.h>
/**
* @defgroup codec2 codec2
*
* The CODEC2 audio codec
*
* https://en.wikipedia.org/wiki/Codec2
*/
enum {
CODEC2_MODE = CODEC2_MODE_2400
};
struct auenc_state {
struct CODEC2 *c2;
};
struct audec_state {
struct CODEC2 *c2;
};
static void encode_destructor(void *data)
{
struct auenc_state *st = data;
if (st->c2)
codec2_destroy(st->c2);
}
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->c2 = codec2_create(CODEC2_MODE);
if (!st->c2) {
err = ENOMEM;
goto out;
}
info("codec2: %d samples per frame, %d bits per frame\n",
codec2_samples_per_frame(st->c2),
codec2_bits_per_frame(st->c2));
out:
if (err)
mem_deref(st);
else
*aesp = st;
return err;
}
static void decode_destructor(void *data)
{
struct audec_state *st = data;
if (st->c2)
codec2_destroy(st->c2);
}
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->c2 = codec2_create(CODEC2_MODE);
if (!st->c2) {
err = ENOMEM;
goto out;
}
out:
if (err)
mem_deref(st);
else
*adsp = st;
return err;
}
static int encode(struct auenc_state *aes, uint8_t *buf,
size_t *len, const int16_t *sampv, size_t sampc)
{
if (!buf || !len || !sampv)
return EINVAL;
if (*len < (size_t)codec2_bits_per_frame(aes->c2)/8)
return ENOMEM;
if (sampc != (size_t)codec2_samples_per_frame(aes->c2))
return EPROTO;
codec2_encode(aes->c2, buf, (short *)sampv);
*len = codec2_bits_per_frame(aes->c2)/8;
return 0;
}
static int decode(struct audec_state *ads, int16_t *sampv,
size_t *sampc, const uint8_t *buf, size_t len)
{
if (!sampv || !sampc || !buf)
return EINVAL;
if (*sampc < (size_t)codec2_samples_per_frame(ads->c2))
return ENOMEM;
if (len < (size_t)codec2_bits_per_frame(ads->c2)/8)
return EPROTO;
codec2_decode(ads->c2, sampv, buf);
*sampc = codec2_samples_per_frame(ads->c2);
return 0;
}
static struct aucodec codec2 = {
LE_INIT,
NULL,
"CODEC2",
8000,
8000,
1,
NULL,
encode_update,
encode,
decode_update,
decode,
NULL,
NULL,
NULL
};
static int module_init(void)
{
aucodec_register(&codec2);
return 0;
}
static int module_close(void)
{
aucodec_unregister(&codec2);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(codec2) = {
"codec2",
"audio codec",
module_init,
module_close,
};
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