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/* $Id$ */
/*
* Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjmedia/plc.h>
#include <pjmedia/errno.h>
#include <pj/assert.h>
#include <pj/pool.h>
#include <pj/string.h>
static void* plc_replay_create(pj_pool_t*, unsigned c, unsigned f);
static void plc_replay_save(void*, pj_int16_t*);
static void plc_replay_generate(void*, pj_int16_t*);
extern void* pjmedia_plc_steveu_create(pj_pool_t*, unsigned c, unsigned f);
extern void pjmedia_plc_steveu_save(void*, pj_int16_t*);
extern void pjmedia_plc_steveu_generate(void*, pj_int16_t*);
/**
* This struct is used internally to represent a PLC backend.
*/
struct plc_alg
{
void* (*plc_create)(pj_pool_t*, unsigned c, unsigned f);
void (*plc_save)(void*, pj_int16_t*);
void (*plc_generate)(void*, pj_int16_t*);
};
#if defined(PJMEDIA_HAS_STEVEU_PLC) && PJMEDIA_HAS_STEVEU_PLC!=0
static struct plc_alg plc_steveu =
{
&pjmedia_plc_steveu_create,
&pjmedia_plc_steveu_save,
&pjmedia_plc_steveu_generate
};
#endif
static struct plc_alg plc_replay =
{
&plc_replay_create,
&plc_replay_save,
&plc_replay_generate
};
struct pjmedia_plc
{
void *obj;
struct plc_alg *op;
};
/*
* Create PLC session. This function will select the PLC algorithm to
* use based on the arguments.
*/
PJ_DEF(pj_status_t) pjmedia_plc_create( pj_pool_t *pool,
unsigned clock_rate,
unsigned samples_per_frame,
unsigned options,
pjmedia_plc **p_plc)
{
pjmedia_plc *plc;
PJ_ASSERT_RETURN(pool && clock_rate && samples_per_frame && p_plc,
PJ_EINVAL);
PJ_ASSERT_RETURN(options == 0, PJ_EINVAL);
PJ_UNUSED_ARG(options);
plc = pj_pool_zalloc(pool, sizeof(pjmedia_plc));
if (0)
;
#if defined(PJMEDIA_HAS_STEVEU_PLC) && PJMEDIA_HAS_STEVEU_PLC!=0
else if (clock_rate == 8000)
plc->op = &plc_steveu;
#endif
else
plc->op = &plc_replay;
plc->obj = plc->op->plc_create(pool, clock_rate, samples_per_frame);
*p_plc = plc;
return PJ_SUCCESS;
}
/*
* Save a good frame to PLC.
*/
PJ_DEF(pj_status_t) pjmedia_plc_save( pjmedia_plc *plc,
pj_int16_t *frame )
{
PJ_ASSERT_RETURN(plc && frame, PJ_EINVAL);
plc->op->plc_save(plc->obj, frame);
return PJ_SUCCESS;
}
/*
* Generate a replacement for lost frame.
*/
PJ_DEF(pj_status_t) pjmedia_plc_generate( pjmedia_plc *plc,
pj_int16_t *frame )
{
PJ_ASSERT_RETURN(plc && frame, PJ_EINVAL);
plc->op->plc_generate(plc->obj, frame);
return PJ_SUCCESS;
}
//////////////////////////////////////////////////////////////////////////////
/*
* Simple replay based plc
*/
struct replay_plc
{
unsigned size;
unsigned replay_cnt;
pj_int16_t *frame;
};
static void* plc_replay_create(pj_pool_t *pool, unsigned clock_rate,
unsigned samples_per_frame)
{
struct replay_plc *o;
PJ_UNUSED_ARG(clock_rate);
o = pj_pool_alloc(pool, sizeof(struct replay_plc));
o->size = samples_per_frame * 2;
o->replay_cnt = 0;
o->frame = pj_pool_zalloc(pool, o->size);
return o;
}
static void plc_replay_save(void *plc, pj_int16_t *frame)
{
struct replay_plc *o = plc;
pj_memcpy(o->frame, frame, o->size);
o->replay_cnt = 0;
}
static void plc_replay_generate(void *plc, pj_int16_t *frame)
{
struct replay_plc *o = plc;
unsigned i, count;
pj_int16_t *samp;
++o->replay_cnt;
if (o->replay_cnt < 16) {
pj_memcpy(frame, o->frame, o->size);
count = o->size / 2;
samp = o->frame;
for (i=0; i<count; ++i)
samp[i] = (pj_int16_t)(samp[i] >> 1);
} else {
pj_bzero(frame, o->size);
}
}
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