git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@14952 65c4cc65-6c06-0410-ace0-fbb531ad65f3
327 lines
6.5 KiB
C
327 lines
6.5 KiB
C
/*
|
|
* 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_a_mu.c - translate between alaw and ulaw directly
|
|
*
|
|
* \ingroup codecs
|
|
*/
|
|
|
|
#include <fcntl.h>
|
|
#include <netinet/in.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/lock.h"
|
|
#include "asterisk/logger.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/translate.h"
|
|
#include "asterisk/channel.h"
|
|
#include "asterisk/alaw.h"
|
|
#include "asterisk/ulaw.h"
|
|
#include "asterisk/utils.h"
|
|
|
|
#define BUFFER_SIZE 8096 /* size for the translation buffers */
|
|
|
|
AST_MUTEX_DEFINE_STATIC(localuser_lock);
|
|
static int localusecnt = 0;
|
|
|
|
static char *tdesc = "A-law and Mulaw direct Coder/Decoder";
|
|
|
|
static unsigned char mu2a[256];
|
|
static unsigned char a2mu[256];
|
|
|
|
/* Sample frame data (Mu data is okay) */
|
|
|
|
#include "ulaw_slin_ex.h"
|
|
|
|
/*
|
|
* Private workspace for translating signed linear signals to alaw.
|
|
*/
|
|
|
|
struct alaw_encoder_pvt
|
|
{
|
|
struct ast_frame f;
|
|
char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
|
|
unsigned char outbuf[BUFFER_SIZE]; /* Encoded alaw, two nibbles to a word */
|
|
int tail;
|
|
};
|
|
|
|
/*
|
|
* Private workspace for translating laws.
|
|
*/
|
|
|
|
struct ulaw_encoder_pvt
|
|
{
|
|
struct ast_frame f;
|
|
char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
|
|
unsigned char outbuf[BUFFER_SIZE]; /* Encoded ulaw values */
|
|
int tail;
|
|
};
|
|
|
|
static struct ast_translator_pvt *alawtoulaw_new(void)
|
|
{
|
|
struct ulaw_encoder_pvt *tmp;
|
|
|
|
if ((tmp = ast_calloc(1, sizeof(*tmp)))) {
|
|
tmp->tail = 0;
|
|
localusecnt++;
|
|
ast_update_use_count();
|
|
}
|
|
|
|
return (struct ast_translator_pvt *)tmp;
|
|
}
|
|
|
|
static struct ast_translator_pvt *ulawtoalaw_new(void)
|
|
{
|
|
struct alaw_encoder_pvt *tmp;
|
|
|
|
if ((tmp = ast_calloc(1, sizeof(*tmp)))) {
|
|
localusecnt++;
|
|
ast_update_use_count();
|
|
tmp->tail = 0;
|
|
}
|
|
|
|
return (struct ast_translator_pvt *)tmp;
|
|
}
|
|
|
|
static int alawtoulaw_framein(struct ast_translator_pvt *pvt, struct ast_frame *f)
|
|
{
|
|
struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *)pvt;
|
|
int x;
|
|
unsigned char *b;
|
|
|
|
if ((tmp->tail + f->datalen) > sizeof(tmp->outbuf)) {
|
|
ast_log(LOG_WARNING, "Out of buffer space\n");
|
|
return -1;
|
|
}
|
|
|
|
/* Reset ssindex and signal to frame's specified values */
|
|
b = f->data;
|
|
for (x=0;x<f->datalen;x++)
|
|
tmp->outbuf[tmp->tail + x] = a2mu[b[x]];
|
|
|
|
tmp->tail += f->datalen;
|
|
return 0;
|
|
}
|
|
|
|
static struct ast_frame *alawtoulaw_frameout(struct ast_translator_pvt *pvt)
|
|
{
|
|
struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *)pvt;
|
|
|
|
if (!tmp->tail)
|
|
return NULL;
|
|
|
|
tmp->f.frametype = AST_FRAME_VOICE;
|
|
tmp->f.subclass = AST_FORMAT_ULAW;
|
|
tmp->f.datalen = tmp->tail;
|
|
tmp->f.samples = tmp->tail;
|
|
tmp->f.mallocd = 0;
|
|
tmp->f.offset = AST_FRIENDLY_OFFSET;
|
|
tmp->f.src = __PRETTY_FUNCTION__;
|
|
tmp->f.data = tmp->outbuf;
|
|
tmp->tail = 0;
|
|
return &tmp->f;
|
|
}
|
|
|
|
static int ulawtoalaw_framein(struct ast_translator_pvt *pvt, struct ast_frame *f)
|
|
{
|
|
struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *)pvt;
|
|
int x;
|
|
unsigned char *s;
|
|
if (tmp->tail + f->datalen >= sizeof(tmp->outbuf)) {
|
|
ast_log(LOG_WARNING, "Out of buffer space\n");
|
|
return -1;
|
|
}
|
|
s = f->data;
|
|
for (x=0;x<f->datalen;x++)
|
|
tmp->outbuf[x+tmp->tail] = mu2a[s[x]];
|
|
tmp->tail += f->datalen;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* LinToalaw_FrameOut
|
|
* Convert a buffer of raw 16-bit signed linear PCM to a buffer
|
|
* of 4-bit alaw packed two to a byte (Big Endian).
|
|
*
|
|
* Results:
|
|
* Foo
|
|
*
|
|
* Side effects:
|
|
* Leftover inbuf data gets packed, tail gets updated.
|
|
*/
|
|
|
|
static struct ast_frame *ulawtoalaw_frameout(struct ast_translator_pvt *pvt)
|
|
{
|
|
struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *)pvt;
|
|
|
|
if (tmp->tail) {
|
|
tmp->f.frametype = AST_FRAME_VOICE;
|
|
tmp->f.subclass = AST_FORMAT_ALAW;
|
|
tmp->f.samples = tmp->tail;
|
|
tmp->f.mallocd = 0;
|
|
tmp->f.offset = AST_FRIENDLY_OFFSET;
|
|
tmp->f.src = __PRETTY_FUNCTION__;
|
|
tmp->f.data = tmp->outbuf;
|
|
tmp->f.datalen = tmp->tail;
|
|
tmp->tail = 0;
|
|
return &tmp->f;
|
|
} else
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* alawToLin_Sample
|
|
*/
|
|
|
|
static struct ast_frame *alawtoulaw_sample(void)
|
|
{
|
|
static struct ast_frame f;
|
|
f.frametype = AST_FRAME_VOICE;
|
|
f.subclass = AST_FORMAT_ALAW;
|
|
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;
|
|
}
|
|
|
|
static struct ast_frame *ulawtoalaw_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;
|
|
}
|
|
|
|
/*
|
|
* alaw_Destroy
|
|
* Destroys a private workspace.
|
|
*
|
|
* Results:
|
|
* It's gone!
|
|
*
|
|
* Side effects:
|
|
* None.
|
|
*/
|
|
|
|
static void alaw_destroy(struct ast_translator_pvt *pvt)
|
|
{
|
|
free(pvt);
|
|
localusecnt--;
|
|
ast_update_use_count();
|
|
}
|
|
|
|
/*
|
|
* The complete translator for alawToLin.
|
|
*/
|
|
|
|
static struct ast_translator alawtoulaw = {
|
|
"alawtoulaw",
|
|
AST_FORMAT_ALAW,
|
|
AST_FORMAT_ULAW,
|
|
alawtoulaw_new,
|
|
alawtoulaw_framein,
|
|
alawtoulaw_frameout,
|
|
alaw_destroy,
|
|
/* NULL */
|
|
alawtoulaw_sample
|
|
};
|
|
|
|
/*
|
|
* The complete translator for LinToalaw.
|
|
*/
|
|
|
|
static struct ast_translator ulawtoalaw = {
|
|
"ulawtoalaw",
|
|
AST_FORMAT_ULAW,
|
|
AST_FORMAT_ALAW,
|
|
ulawtoalaw_new,
|
|
ulawtoalaw_framein,
|
|
ulawtoalaw_frameout,
|
|
alaw_destroy,
|
|
/* NULL */
|
|
ulawtoalaw_sample
|
|
};
|
|
|
|
int unload_module(void)
|
|
{
|
|
int res;
|
|
ast_mutex_lock(&localuser_lock);
|
|
res = ast_unregister_translator(&ulawtoalaw);
|
|
if (!res)
|
|
res = ast_unregister_translator(&alawtoulaw);
|
|
if (localusecnt)
|
|
res = -1;
|
|
ast_mutex_unlock(&localuser_lock);
|
|
return res;
|
|
}
|
|
|
|
int load_module(void)
|
|
{
|
|
int res;
|
|
int x;
|
|
for (x=0;x<256;x++) {
|
|
mu2a[x] = AST_LIN2A(AST_MULAW(x));
|
|
a2mu[x] = AST_LIN2MU(AST_ALAW(x));
|
|
}
|
|
res = ast_register_translator(&alawtoulaw);
|
|
if (!res)
|
|
res = ast_register_translator(&ulawtoalaw);
|
|
else
|
|
ast_unregister_translator(&alawtoulaw);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Return a description of this module.
|
|
*/
|
|
|
|
char *description(void)
|
|
{
|
|
return tdesc;
|
|
}
|
|
|
|
int usecount(void)
|
|
{
|
|
int res;
|
|
STANDARD_USECOUNT(res);
|
|
return res;
|
|
}
|
|
|
|
char *key()
|
|
{
|
|
return ASTERISK_GPL_KEY;
|
|
}
|