![citats](/assets/img/avatar_default.png)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@3276 f38db490-d61c-443f-a65b-d21fe96a405b
379 lines
7.3 KiB
C
Executable file
379 lines
7.3 KiB
C
Executable file
/* codec_alaw.c - translate between signed linear and alaw
|
|
*
|
|
* Asterisk -- A telephony toolkit for Linux.
|
|
*
|
|
* Copyright (c) 2001 Linux Support Services, Inc. All rights reserved.
|
|
*
|
|
* Mark Spencer <markster@linux-support.net
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License
|
|
*/
|
|
|
|
#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 <fcntl.h>
|
|
#include <netinet/in.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.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 Coder/Decoder";
|
|
|
|
/* Sample frame data (Mu data is okay) */
|
|
|
|
#include "slin_ulaw_ex.h"
|
|
#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 alaw signals to signed linear.
|
|
*/
|
|
|
|
struct alaw_decoder_pvt
|
|
{
|
|
struct ast_frame f;
|
|
char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
|
|
short outbuf[BUFFER_SIZE]; /* Decoded signed linear values */
|
|
int tail;
|
|
};
|
|
|
|
/*
|
|
* alawToLin_New
|
|
* Create a new instance of alaw_decoder_pvt.
|
|
*
|
|
* Results:
|
|
* Returns a pointer to the new instance.
|
|
*
|
|
* Side effects:
|
|
* None.
|
|
*/
|
|
|
|
static struct ast_translator_pvt *
|
|
alawtolin_new (void)
|
|
{
|
|
struct alaw_decoder_pvt *tmp;
|
|
tmp = malloc (sizeof (struct alaw_decoder_pvt));
|
|
if (tmp)
|
|
{
|
|
memset(tmp, 0, sizeof(*tmp));
|
|
tmp->tail = 0;
|
|
localusecnt++;
|
|
ast_update_use_count ();
|
|
}
|
|
return (struct ast_translator_pvt *) tmp;
|
|
}
|
|
|
|
/*
|
|
* LinToalaw_New
|
|
* Create a new instance of alaw_encoder_pvt.
|
|
*
|
|
* Results:
|
|
* Returns a pointer to the new instance.
|
|
*
|
|
* Side effects:
|
|
* None.
|
|
*/
|
|
|
|
static struct ast_translator_pvt *
|
|
lintoalaw_new (void)
|
|
{
|
|
struct alaw_encoder_pvt *tmp;
|
|
tmp = malloc (sizeof (struct alaw_encoder_pvt));
|
|
if (tmp)
|
|
{
|
|
memset(tmp, 0, sizeof(*tmp));
|
|
localusecnt++;
|
|
ast_update_use_count ();
|
|
tmp->tail = 0;
|
|
}
|
|
return (struct ast_translator_pvt *) tmp;
|
|
}
|
|
|
|
/*
|
|
* alawToLin_FrameIn
|
|
* Fill an input buffer with packed 4-bit alaw values if there is room
|
|
* left.
|
|
*
|
|
* Results:
|
|
* Foo
|
|
*
|
|
* Side effects:
|
|
* tmp->tail is the number of packed values in the buffer.
|
|
*/
|
|
|
|
static int
|
|
alawtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
|
|
{
|
|
struct alaw_decoder_pvt *tmp = (struct alaw_decoder_pvt *) pvt;
|
|
int x;
|
|
unsigned char *b;
|
|
|
|
if ((tmp->tail + f->datalen) * 2 > 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] = AST_ALAW(b[x]);
|
|
|
|
tmp->tail += f->datalen;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* alawToLin_FrameOut
|
|
* Convert 4-bit alaw encoded signals to 16-bit signed linear.
|
|
*
|
|
* Results:
|
|
* Converted signals are placed in tmp->f.data, tmp->f.datalen
|
|
* and tmp->f.samples are calculated.
|
|
*
|
|
* Side effects:
|
|
* None.
|
|
*/
|
|
|
|
static struct ast_frame *
|
|
alawtolin_frameout (struct ast_translator_pvt *pvt)
|
|
{
|
|
struct alaw_decoder_pvt *tmp = (struct alaw_decoder_pvt *) pvt;
|
|
|
|
if (!tmp->tail)
|
|
return NULL;
|
|
|
|
tmp->f.frametype = AST_FRAME_VOICE;
|
|
tmp->f.subclass = AST_FORMAT_SLINEAR;
|
|
tmp->f.datalen = tmp->tail *2;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* LinToalaw_FrameIn
|
|
* Fill an input buffer with 16-bit signed linear PCM values.
|
|
*
|
|
* Results:
|
|
* None.
|
|
*
|
|
* Side effects:
|
|
* tmp->tail is number of signal values in the input buffer.
|
|
*/
|
|
|
|
static int
|
|
lintoalaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
|
|
{
|
|
struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *) pvt;
|
|
int x;
|
|
short *s;
|
|
if (tmp->tail + f->datalen/2 >= sizeof(tmp->outbuf))
|
|
{
|
|
ast_log (LOG_WARNING, "Out of buffer space\n");
|
|
return -1;
|
|
}
|
|
s = f->data;
|
|
for (x=0;x<f->datalen/2;x++)
|
|
tmp->outbuf[x+tmp->tail] = AST_LIN2A(s[x]);
|
|
tmp->tail += f->datalen/2;
|
|
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 *
|
|
lintoalaw_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 *
|
|
alawtolin_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;
|
|
}
|
|
|
|
/*
|
|
* LinToalaw_Sample
|
|
*/
|
|
|
|
static struct ast_frame *
|
|
lintoalaw_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;
|
|
}
|
|
|
|
/*
|
|
* 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 alawtolin = {
|
|
"alawtolin",
|
|
AST_FORMAT_ALAW,
|
|
AST_FORMAT_SLINEAR,
|
|
alawtolin_new,
|
|
alawtolin_framein,
|
|
alawtolin_frameout,
|
|
alaw_destroy,
|
|
/* NULL */
|
|
alawtolin_sample
|
|
};
|
|
|
|
/*
|
|
* The complete translator for LinToalaw.
|
|
*/
|
|
|
|
static struct ast_translator lintoalaw = {
|
|
"lintoalaw",
|
|
AST_FORMAT_SLINEAR,
|
|
AST_FORMAT_ALAW,
|
|
lintoalaw_new,
|
|
lintoalaw_framein,
|
|
lintoalaw_frameout,
|
|
alaw_destroy,
|
|
/* NULL */
|
|
lintoalaw_sample
|
|
};
|
|
|
|
int
|
|
unload_module (void)
|
|
{
|
|
int res;
|
|
ast_mutex_lock (&localuser_lock);
|
|
res = ast_unregister_translator (&lintoalaw);
|
|
if (!res)
|
|
res = ast_unregister_translator (&alawtolin);
|
|
if (localusecnt)
|
|
res = -1;
|
|
ast_mutex_unlock (&localuser_lock);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
load_module (void)
|
|
{
|
|
int res;
|
|
res = ast_register_translator (&alawtolin);
|
|
if (!res)
|
|
res = ast_register_translator (&lintoalaw);
|
|
else
|
|
ast_unregister_translator (&alawtolin);
|
|
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;
|
|
}
|