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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2007, Digium, Inc.
*
* Russell Bryant <russell@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
*
* \brief Resample slinear audio
*
* \note To install libresample, check it out of the following repository:
* <code>$ svn co http://svn.digium.com/svn/thirdparty/libresample/trunk</code>
*
* \ingroup codecs
*/
/*** MODULEINFO
<depend>resample</depend>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
/* These are for SHRT_MAX and FLT_MAX -- { */
#if defined(__Darwin__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__CYGWIN__)
#include <float.h>
#else
#include <values.h>
#endif
#include <limits.h>
/* } */
#include <libresample.h>
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/slin.h"
#define RESAMPLER_QUALITY 1
#define OUTBUF_SIZE 8096
struct slin16_to_slin8_pvt {
void *resampler;
float resample_factor;
};
struct slin8_to_slin16_pvt {
void *resampler;
float resample_factor;
};
static int slin16_to_slin8_new(struct ast_trans_pvt *pvt)
{
struct slin16_to_slin8_pvt *resamp_pvt = pvt->pvt;
resamp_pvt->resample_factor = 8000.0 / 16000.0;
if (!(resamp_pvt->resampler = resample_open(RESAMPLER_QUALITY, resamp_pvt->resample_factor, resamp_pvt->resample_factor)))
return -1;
return 0;
}
static int slin8_to_slin16_new(struct ast_trans_pvt *pvt)
{
struct slin8_to_slin16_pvt *resamp_pvt = pvt->pvt;
resamp_pvt->resample_factor = 16000.0 / 8000.0;
if (!(resamp_pvt->resampler = resample_open(RESAMPLER_QUALITY, resamp_pvt->resample_factor, resamp_pvt->resample_factor)))
return -1;
return 0;
}
static void slin16_to_slin8_destroy(struct ast_trans_pvt *pvt)
{
struct slin16_to_slin8_pvt *resamp_pvt = pvt->pvt;
if (resamp_pvt->resampler)
resample_close(resamp_pvt->resampler);
}
static void slin8_to_slin16_destroy(struct ast_trans_pvt *pvt)
{
struct slin8_to_slin16_pvt *resamp_pvt = pvt->pvt;
if (resamp_pvt->resampler)
resample_close(resamp_pvt->resampler);
}
static int resample_frame(struct ast_trans_pvt *pvt,
void *resampler, float resample_factor, struct ast_frame *f)
{
int total_in_buf_used = 0;
int total_out_buf_used = 0;
int16_t *in_buf = (int16_t *) f->data.ptr;
int16_t *out_buf = pvt->outbuf.i16 + pvt->samples;
float in_buf_f[f->samples];
float out_buf_f[2048];
int res = 0;
int i;
for (i = 0; i < f->samples; i++)
in_buf_f[i] = in_buf[i] * (FLT_MAX / SHRT_MAX);
while (total_in_buf_used < f->samples) {
int in_buf_used, out_buf_used;
out_buf_used = resample_process(resampler, resample_factor,
&in_buf_f[total_in_buf_used], f->samples - total_in_buf_used,
0, &in_buf_used,
&out_buf_f[total_out_buf_used], ARRAY_LEN(out_buf_f) - total_out_buf_used);
if (out_buf_used < 0)
break;
total_out_buf_used += out_buf_used;
total_in_buf_used += in_buf_used;
if (total_out_buf_used == ARRAY_LEN(out_buf_f)) {
ast_log(LOG_ERROR, "Output buffer filled ... need to increase its size\n");
res = -1;
break;
}
}
for (i = 0; i < total_out_buf_used; i++)
out_buf[i] = out_buf_f[i] * (SHRT_MAX / FLT_MAX);
pvt->samples += total_out_buf_used;
pvt->datalen += (total_out_buf_used * sizeof(int16_t));
return res;
}
static int slin16_to_slin8_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct slin16_to_slin8_pvt *resamp_pvt = pvt->pvt;
void *resampler = resamp_pvt->resampler;
float resample_factor = resamp_pvt->resample_factor;
return resample_frame(pvt, resampler, resample_factor, f);
}
static int slin8_to_slin16_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
struct slin8_to_slin16_pvt *resamp_pvt = pvt->pvt;
void *resampler = resamp_pvt->resampler;
float resample_factor = resamp_pvt->resample_factor;
return resample_frame(pvt, resampler, resample_factor, f);
}
static struct ast_translator slin16_to_slin8 = {
.name = "slin16_to_slin8",
.srcfmt = AST_FORMAT_SLINEAR16,
.dstfmt = AST_FORMAT_SLINEAR,
.newpvt = slin16_to_slin8_new,
.destroy = slin16_to_slin8_destroy,
.framein = slin16_to_slin8_framein,
.sample = slin16_sample,
.desc_size = sizeof(struct slin16_to_slin8_pvt),
.buffer_samples = (OUTBUF_SIZE / sizeof(int16_t)),
.buf_size = OUTBUF_SIZE,
};
static struct ast_translator slin8_to_slin16 = {
.name = "slin8_to_slin16",
.srcfmt = AST_FORMAT_SLINEAR,
.dstfmt = AST_FORMAT_SLINEAR16,
.newpvt = slin8_to_slin16_new,
.destroy = slin8_to_slin16_destroy,
.framein = slin8_to_slin16_framein,
.sample = slin8_sample,
.desc_size = sizeof(struct slin8_to_slin16_pvt),
.buffer_samples = (OUTBUF_SIZE / sizeof(int16_t)),
.buf_size = OUTBUF_SIZE,
};
static int unload_module(void)
{
int res = 0;
res |= ast_unregister_translator(&slin16_to_slin8);
res |= ast_unregister_translator(&slin8_to_slin16);
return res;
}
static int load_module(void)
{
int res = 0;
res |= ast_register_translator(&slin16_to_slin8);
res |= ast_register_translator(&slin8_to_slin16);
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SLIN Resampling Codec");
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