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/**
* @file g726.c G.726 Audio Codec
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES 1
#include <spandsp.h>
/**
* @defgroup g726 g726
*
* The G.726 audio codec
*/
enum { MAX_PACKET = 100 };
struct g726_aucodec {
struct aucodec ac;
int bitrate;
};
struct auenc_state {
g726_state_t st;
};
struct audec_state {
g726_state_t st;
};
static void encode_destructor(void *arg)
{
struct auenc_state *st = arg;
g726_release(&st->st);
}
static void decode_destructor(void *arg)
{
struct audec_state *st = arg;
g726_release(&st->st);
}
static int encode_update(struct auenc_state **aesp,
const struct aucodec *ac,
struct auenc_param *prm, const char *fmtp)
{
struct g726_aucodec *gac = (struct g726_aucodec *)ac;
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;
if (!g726_init(&st->st, gac->bitrate, G726_ENCODING_LINEAR,
G726_PACKING_LEFT)) {
err = ENOMEM;
goto out;
}
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 g726_aucodec *gac = (struct g726_aucodec *)ac;
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;
if (!g726_init(&st->st, gac->bitrate, G726_ENCODING_LINEAR,
G726_PACKING_LEFT)) {
err = ENOMEM;
goto out;
}
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)
{
if (!buf || !len || !sampv)
return EINVAL;
if (*len < MAX_PACKET)
return ENOMEM;
*len = g726_encode(&st->st, buf, sampv, (int)sampc);
return 0;
}
static int decode(struct audec_state *st, int16_t *sampv,
size_t *sampc, const uint8_t *buf, size_t len)
{
if (!sampv || !sampc || !buf)
return EINVAL;
*sampc = g726_decode(&st->st, sampv, buf, (int)len);
return 0;
}
static struct g726_aucodec g726[4] = {
{
{
LE_INIT, 0, "G726-40", 8000, 8000, 1, NULL,
encode_update, encode, decode_update, decode, 0, 0, 0
},
40000
},
{
{
LE_INIT, 0, "G726-32", 8000, 8000, 1, NULL,
encode_update, encode, decode_update, decode, 0, 0, 0
},
32000
},
{
{
LE_INIT, 0, "G726-24", 8000, 8000, 1, NULL,
encode_update, encode, decode_update, decode, 0, 0, 0
},
24000
},
{
{
LE_INIT, 0, "G726-16", 8000, 8000, 1, NULL,
encode_update, encode, decode_update, decode, 0, 0, 0
},
16000
}
};
static int module_init(void)
{
size_t i;
for (i=0; i<ARRAY_SIZE(g726); i++)
aucodec_register((struct aucodec *)&g726[i]);
return 0;
}
static int module_close(void)
{
size_t i;
for (i=0; i<ARRAY_SIZE(g726); i++)
aucodec_unregister((struct aucodec *)&g726[i]);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(g726) = {
"g726",
"audio codec",
module_init,
module_close,
};
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