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/**
* @file l16.c 16-bit linear codec
*
* Copyright (C) 2010 - 2015 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
/**
* @defgroup l16 l16
*
* Linear 16-bit audio codec
*/
enum {NR_CODECS = 8};
static int encode(struct auenc_state *st, uint8_t *buf, size_t *len,
const int16_t *sampv, size_t sampc)
{
int16_t *p = (void *)buf;
(void)st;
if (!buf || !len || !sampv)
return EINVAL;
if (*len < sampc*2)
return ENOMEM;
*len = sampc*2;
while (sampc--)
*p++ = htons(*sampv++);
return 0;
}
static int decode(struct audec_state *st, int16_t *sampv, size_t *sampc,
const uint8_t *buf, size_t len)
{
int16_t *p = (void *)buf;
(void)st;
if (!buf || !len || !sampv)
return EINVAL;
if (*sampc < len/2)
return ENOMEM;
*sampc = len/2;
len /= 2;
while (len--)
*sampv++ = ntohs(*p++);
return 0;
}
/* See RFC 3551 */
static struct aucodec l16v[NR_CODECS] = {
{LE_INIT, "10", "L16", 44100, 44100, 2, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, 0, "L16", 32000, 32000, 2, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, 0, "L16", 16000, 16000, 2, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, 0, "L16", 8000, 8000, 2, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, "11", "L16", 44100, 44100, 1, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, 0, "L16", 32000, 32000, 1, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, 0, "L16", 16000, 16000, 1, 0, 0, encode, 0, decode, 0, 0, 0},
{LE_INIT, 0, "L16", 8000, 8000, 1, 0, 0, encode, 0, decode, 0, 0, 0},
};
static int module_init(void)
{
struct list *aucodecl = baresip_aucodecl();
size_t i;
for (i=0; i<NR_CODECS; i++)
aucodec_register(aucodecl, &l16v[i]);
return 0;
}
static int module_close(void)
{
size_t i;
for (i=0; i<NR_CODECS; i++)
aucodec_unregister(&l16v[i]);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(l16) = {
"l16",
"codec",
module_init,
module_close
};
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