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/* $Id: resample_speex.c 3553 2011-05-05 06:14:19Z nanang $ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 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/resample.h>
#include <pjmedia/errno.h>
#include <pj/assert.h>
#include <pj/log.h>
#include <pj/pool.h>
#if PJMEDIA_RESAMPLE_IMP==PJMEDIA_RESAMPLE_SPEEX
#include <speex/speex_resampler.h>
#define THIS_FILE "resample_speex.c"
struct pjmedia_resample
{
SpeexResamplerState *state;
unsigned in_samples_per_frame;
unsigned out_samples_per_frame;
};
PJ_DEF(pj_status_t) pjmedia_resample_create( pj_pool_t *pool,
pj_bool_t high_quality,
pj_bool_t large_filter,
unsigned channel_count,
unsigned rate_in,
unsigned rate_out,
unsigned samples_per_frame,
pjmedia_resample **p_resample)
{
pjmedia_resample *resample;
int quality;
int err;
PJ_ASSERT_RETURN(pool && p_resample && rate_in &&
rate_out && samples_per_frame, PJ_EINVAL);
resample = PJ_POOL_ZALLOC_T(pool, pjmedia_resample);
PJ_ASSERT_RETURN(resample, PJ_ENOMEM);
if (high_quality) {
if (large_filter)
quality = 10;
else
quality = 7;
} else {
quality = 3;
}
resample->in_samples_per_frame = samples_per_frame;
resample->out_samples_per_frame = rate_out / (rate_in / samples_per_frame);
resample->state = speex_resampler_init(channel_count, rate_in, rate_out,
quality, &err);
if (resample->state == NULL || err != RESAMPLER_ERR_SUCCESS)
return PJ_ENOMEM;
*p_resample = resample;
PJ_LOG(5,(THIS_FILE,
"resample created: quality=%d, ch=%d, in/out rate=%d/%d",
quality, channel_count, rate_in, rate_out));
return PJ_SUCCESS;
}
PJ_DEF(void) pjmedia_resample_run( pjmedia_resample *resample,
const pj_int16_t *input,
pj_int16_t *output )
{
spx_uint32_t in_length, out_length;
PJ_ASSERT_ON_FAIL(resample, return);
in_length = resample->in_samples_per_frame;
out_length = resample->out_samples_per_frame;
speex_resampler_process_interleaved_int(resample->state,
(const __int16 *)input, &in_length,
(__int16 *)output, &out_length);
pj_assert(in_length == resample->in_samples_per_frame);
pj_assert(out_length == resample->out_samples_per_frame);
}
PJ_DEF(unsigned) pjmedia_resample_get_input_size(pjmedia_resample *resample)
{
PJ_ASSERT_RETURN(resample != NULL, 0);
return resample->in_samples_per_frame;
}
PJ_DEF(void) pjmedia_resample_destroy(pjmedia_resample *resample)
{
PJ_ASSERT_ON_FAIL(resample, return);
if (resample->state) {
speex_resampler_destroy(resample->state);
resample->state = NULL;
}
}
#else /* PJMEDIA_RESAMPLE_IMP==PJMEDIA_RESAMPLE_SPEEX */
int pjmedia_resample_speex_excluded;
#endif /* PJMEDIA_RESAMPLE_IMP==PJMEDIA_RESAMPLE_SPEEX */
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