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/**
* @file bv32.c BroadVoice32 audio codec
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <bv32/bv32.h>
#include <bv32/bitpack.h>
/*
* BroadVoice32 Wideband Audio codec (RFC 4298)
*
* http://www.broadcom.com/support/broadvoice/downloads.php
* http://files.freeswitch.org/downloads/libs/libbv32-0.1.tar.gz
*/
enum {
NSAMP = 80,
CODED_OCTETS = 20
};
struct auenc_state {
struct BV32_Encoder_State cs;
struct BV32_Bit_Stream bsc;
};
struct audec_state {
struct BV32_Decoder_State ds;
struct BV32_Bit_Stream bsd;
};
static void encode_destructor(void *arg)
{
struct auenc_state *st = arg;
Reset_BV32_Coder(&st->cs);
}
static void decode_destructor(void *arg)
{
struct audec_state *st = arg;
Reset_BV32_Decoder(&st->ds);
}
static int encode_update(struct auenc_state **aesp, const struct aucodec *ac,
struct auenc_param *prm, const char *fmtp)
{
struct auenc_state *st;
(void)prm;
(void)fmtp;
if (!aesp || !ac)
return EINVAL;
if (*aesp)
return 0;
st = mem_zalloc(sizeof(*st), encode_destructor);
if (!st)
return ENOMEM;
Reset_BV32_Coder(&st->cs);
*aesp = st;
return 0;
}
static int decode_update(struct audec_state **adsp,
const struct aucodec *ac, const char *fmtp)
{
struct audec_state *st;
(void)fmtp;
if (!adsp || !ac)
return EINVAL;
if (*adsp)
return 0;
st = mem_zalloc(sizeof(*st), decode_destructor);
if (!st)
return ENOMEM;
Reset_BV32_Decoder(&st->ds);
*adsp = st;
return 0;
}
static int encode(struct auenc_state *st, uint8_t *buf, size_t *len,
int fmt, const void *sampv, size_t sampc)
{
size_t i, nframe;
short *p = (short *)sampv;
nframe = sampc / NSAMP;
if (*len < nframe * CODED_OCTETS)
return ENOMEM;
if (fmt != AUFMT_S16LE)
return ENOTSUP;
for (i=0; i<nframe; i++) {
BV32_Encode(&st->bsc, &st->cs, &p[i*NSAMP]);
BV32_BitPack((void *)&buf[i*CODED_OCTETS], &st->bsc);
}
*len = CODED_OCTETS * nframe;
return 0;
}
static int decode(struct audec_state *st, int fmt, void *sampv,
size_t *sampc, const uint8_t *buf, size_t len)
{
size_t i, nframe;
short *p = sampv;
nframe = len / CODED_OCTETS;
if (fmt != AUFMT_S16LE)
return ENOTSUP;
if (*sampc < NSAMP*nframe)
return ENOMEM;
for (i=0; i<nframe; i++) {
BV32_BitUnPack((void *)&buf[i*CODED_OCTETS], &st->bsd);
BV32_Decode(&st->bsd, &st->ds, &p[i*NSAMP]);
}
*sampc = NSAMP * nframe;
return 0;
}
static int plc(struct audec_state *st, int fmt, void *sampv, size_t *sampc)
{
if (fmt != AUFMT_S16LE)
return ENOTSUP;
BV32_PLC(&st->ds, sampv);
*sampc = NSAMP;
return 0;
}
static struct aucodec bv32 = {
LE_INIT, 0, "BV32", 16000, 16000, 1, NULL,
encode_update, encode,
decode_update, decode, plc,
NULL, NULL
};
static int module_init(void)
{
aucodec_register(baresip_aucodecl(), &bv32);
return 0;
}
static int module_close(void)
{
aucodec_unregister(&bv32);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(bv32) = {
"bv32",
"codec",
module_init,
module_close
};
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