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/**
* @file speex_aec.c Speex Acoustic Echo Cancellation
*
* Copyright (C) 2010 Creytiv.com
*/
#include <stdlib.h>
#include <string.h>
#include <speex/speex.h>
#include <speex/speex_echo.h>
#include <re.h>
#include <baresip.h>
/**
* @defgroup speex_aec speex_aec
*
* Acoustic Echo Cancellation (AEC) from libspeexdsp
*/
struct speex_st {
int16_t *out;
SpeexEchoState *state;
};
struct enc_st {
struct aufilt_enc_st af; /* base class */
struct speex_st *st;
};
struct dec_st {
struct aufilt_dec_st af; /* base class */
struct speex_st *st;
};
static void enc_destructor(void *arg)
{
struct enc_st *st = arg;
list_unlink(&st->af.le);
mem_deref(st->st);
}
static void dec_destructor(void *arg)
{
struct dec_st *st = arg;
list_unlink(&st->af.le);
mem_deref(st->st);
}
#ifdef SPEEX_SET_VBR_MAX_BITRATE
static void speex_aec_destructor(void *arg)
{
struct speex_st *st = arg;
if (st->state)
speex_echo_state_destroy(st->state);
mem_deref(st->out);
}
static int aec_alloc(struct speex_st **stp, void **ctx, struct aufilt_prm *prm)
{
struct speex_st *st;
uint32_t sampc;
int err, tmp, fl;
if (!stp || !ctx || !prm)
return EINVAL;
if (*ctx) {
*stp = mem_ref(*ctx);
return 0;
}
st = mem_zalloc(sizeof(*st), speex_aec_destructor);
if (!st)
return ENOMEM;
sampc = prm->srate * prm->ch * prm->ptime / 1000;
st->out = mem_alloc(2 * sampc, NULL);
if (!st->out) {
err = ENOMEM;
goto out;
}
/* Echo canceller with 200 ms tail length */
fl = 10 * sampc;
st->state = speex_echo_state_init(sampc, fl);
if (!st->state) {
err = ENOMEM;
goto out;
}
tmp = prm->srate;
err = speex_echo_ctl(st->state, SPEEX_ECHO_SET_SAMPLING_RATE, &tmp);
if (err < 0) {
warning("speex_aec: speex_echo_ctl: err=%d\n", err);
}
info("speex_aec: Speex AEC loaded: srate = %uHz\n", prm->srate);
out:
if (err)
mem_deref(st);
else
*ctx = *stp = st;
return err;
}
static int encode_update(struct aufilt_enc_st **stp, void **ctx,
const struct aufilt *af, struct aufilt_prm *prm)
{
struct enc_st *st;
int err;
if (!stp || !ctx || !af || !prm)
return EINVAL;
if (*stp)
return 0;
st = mem_zalloc(sizeof(*st), enc_destructor);
if (!st)
return ENOMEM;
err = aec_alloc(&st->st, ctx, prm);
if (err)
mem_deref(st);
else
*stp = (struct aufilt_enc_st *)st;
return err;
}
static int decode_update(struct aufilt_dec_st **stp, void **ctx,
const struct aufilt *af, struct aufilt_prm *prm)
{
struct dec_st *st;
int err;
if (!stp || !ctx || !af || !prm)
return EINVAL;
if (*stp)
return 0;
st = mem_zalloc(sizeof(*st), dec_destructor);
if (!st)
return ENOMEM;
err = aec_alloc(&st->st, ctx, prm);
if (err)
mem_deref(st);
else
*stp = (struct aufilt_dec_st *)st;
return err;
}
static int encode(struct aufilt_enc_st *st, int16_t *sampv, size_t *sampc)
{
struct enc_st *est = (struct enc_st *)st;
struct speex_st *sp = est->st;
if (*sampc) {
speex_echo_capture(sp->state, sampv, sp->out);
memcpy(sampv, sp->out, *sampc * 2);
}
return 0;
}
static int decode(struct aufilt_dec_st *st, int16_t *sampv, size_t *sampc)
{
struct dec_st *dst = (struct dec_st *)st;
struct speex_st *sp = dst->st;
if (*sampc)
speex_echo_playback(sp->state, sampv);
return 0;
}
#endif
static struct aufilt speex_aec = {
LE_INIT, "speex_aec", encode_update, encode, decode_update, decode
};
static int module_init(void)
{
/* Note: Hack to check libspeex version */
#ifdef SPEEX_SET_VBR_MAX_BITRATE
aufilt_register(baresip_aufiltl(), &speex_aec);
return 0;
#else
return ENOSYS;
#endif
}
static int module_close(void)
{
aufilt_unregister(&speex_aec);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(speex_aec) = {
"speex_aec",
"filter",
module_init,
module_close
};
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