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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@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 codec_ulaw.c - translate between signed linear and ulaw
*
* \ingroup codecs
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <fcntl.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "asterisk/lock.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/options.h"
#include "asterisk/translate.h"
#include "asterisk/channel.h"
#include "asterisk/ulaw.h"
#include "asterisk/utils.h"
#define BUFFER_SAMPLES 8096 /* size for the translation buffers */
/* Sample frame data */
#include "slin_ulaw_ex.h"
#include "ulaw_slin_ex.h"
/*! \brief convert and store samples in outbuf */
static int ulawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
int i = f->samples;
unsigned char *src = f->data;
int16_t *dst = (int16_t *)pvt->outbuf + pvt->samples;
pvt->samples += i;
pvt->datalen += i * 2; /* 2 bytes/sample */
/* convert and copy in outbuf */
while (i--)
*dst++ = AST_MULAW(*src++);
return 0;
}
/*! \brief convert and store samples in outbuf */
static int lintoulaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
{
int i = f->samples;
char *dst = pvt->outbuf + pvt->samples;
int16_t *src = f->data;
pvt->samples += i;
pvt->datalen += i; /* 1 byte/sample */
while (i--)
*dst++ = AST_LIN2MU(*src++);
return 0;
}
/*! * \brief ulawToLin_Sample */
static struct ast_frame *ulawtolin_sample(void)
{
static struct ast_frame f;
f.frametype = AST_FRAME_VOICE;
f.subclass = AST_FORMAT_ULAW;
f.datalen = sizeof(ulaw_slin_ex);
f.samples = sizeof(ulaw_slin_ex);
f.mallocd = 0;
f.offset = 0;
f.src = __PRETTY_FUNCTION__;
f.data = ulaw_slin_ex;
return &f;
}
/*!
* \brief LinToulaw_Sample
*/
static struct ast_frame *lintoulaw_sample(void)
{
static struct ast_frame f;
f.frametype = AST_FRAME_VOICE;
f.subclass = AST_FORMAT_SLINEAR;
f.datalen = sizeof(slin_ulaw_ex);
/* Assume 8000 Hz */
f.samples = sizeof(slin_ulaw_ex) / 2;
f.mallocd = 0;
f.offset = 0;
f.src = __PRETTY_FUNCTION__;
f.data = slin_ulaw_ex;
return &f;
}
/*!
* \brief The complete translator for ulawToLin.
*/
static struct ast_translator ulawtolin = {
.name = "ulawtolin",
.srcfmt = AST_FORMAT_ULAW,
.dstfmt = AST_FORMAT_SLINEAR,
.framein = ulawtolin_framein,
.sample = ulawtolin_sample,
.buffer_samples = BUFFER_SAMPLES,
.buf_size = BUFFER_SAMPLES * 2,
.plc_samples = 160,
};
/*!
* \brief The complete translator for LinToulaw.
*/
static struct ast_translator lintoulaw = {
.name = "lintoulaw",
.srcfmt = AST_FORMAT_SLINEAR,
.dstfmt = AST_FORMAT_ULAW,
.framein = lintoulaw_framein,
.sample = lintoulaw_sample,
.buf_size = BUFFER_SAMPLES,
.buffer_samples = BUFFER_SAMPLES,
};
static void parse_config(void)
{
struct ast_variable *var;
struct ast_config *cfg = ast_config_load("codecs.conf");
if (!cfg)
return;
for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
if (!strcasecmp(var->name, "genericplc")) {
ulawtolin.useplc = ast_true(var->value) ? 1 : 0;
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "codec_ulaw: %susing generic PLC\n", ulawtolin.useplc ? "" : "not ");
}
}
ast_config_destroy(cfg);
}
static int reload(void)
{
parse_config();
return 0;
}
static int unload_module(void)
{
int res;
res = ast_unregister_translator(&lintoulaw);
res |= ast_unregister_translator(&ulawtolin);
return res;
}
static int load_module(void)
{
int res;
parse_config();
res = ast_register_translator(&ulawtolin);
if (!res)
res = ast_register_translator(&lintoulaw);
else
ast_unregister_translator(&ulawtolin);
return res;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "mu-Law Coder/Decoder",
.load = load_module,
.unload = unload_module,
.reload = reload,
);
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