Version 0.1.8 from FTP
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@267 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
parent
c8ee4d21ce
commit
de73497efe
|
@ -0,0 +1,378 @@
|
|||
/* codec_ulaw.c - translate between signed linear and ulaw
|
||||
*
|
||||
* 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/logger.h>
|
||||
#include <asterisk/module.h>
|
||||
#include <asterisk/translate.h>
|
||||
#include <asterisk/channel.h>
|
||||
#include <asterisk/ulaw.h>
|
||||
#include <fcntl.h>
|
||||
#include <netinet/in.h>
|
||||
#include <pthread.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#define BUFFER_SIZE 8096 /* size for the translation buffers */
|
||||
|
||||
static pthread_mutex_t localuser_lock = PTHREAD_MUTEX_INITIALIZER;
|
||||
static int localusecnt = 0;
|
||||
|
||||
static char *tdesc = "Mu-law Coder/Decoder";
|
||||
|
||||
/* Sample frame data */
|
||||
|
||||
#include "slin_ulaw_ex.h"
|
||||
#include "ulaw_slin_ex.h"
|
||||
|
||||
/*
|
||||
* Private workspace for translating signed linear signals to ulaw.
|
||||
*/
|
||||
|
||||
struct ulaw_encoder_pvt
|
||||
{
|
||||
struct ast_frame f;
|
||||
char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
|
||||
unsigned char outbuf[BUFFER_SIZE]; /* Encoded ulaw, two nibbles to a word */
|
||||
int tail;
|
||||
};
|
||||
|
||||
/*
|
||||
* Private workspace for translating ulaw signals to signed linear.
|
||||
*/
|
||||
|
||||
struct ulaw_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;
|
||||
};
|
||||
|
||||
/*
|
||||
* ulawToLin_New
|
||||
* Create a new instance of ulaw_decoder_pvt.
|
||||
*
|
||||
* Results:
|
||||
* Returns a pointer to the new instance.
|
||||
*
|
||||
* Side effects:
|
||||
* None.
|
||||
*/
|
||||
|
||||
static struct ast_translator_pvt *
|
||||
ulawtolin_new ()
|
||||
{
|
||||
struct ulaw_decoder_pvt *tmp;
|
||||
tmp = malloc (sizeof (struct ulaw_decoder_pvt));
|
||||
if (tmp)
|
||||
{
|
||||
memset(tmp, 0, sizeof(*tmp));
|
||||
tmp->tail = 0;
|
||||
localusecnt++;
|
||||
ast_update_use_count ();
|
||||
}
|
||||
return (struct ast_translator_pvt *) tmp;
|
||||
}
|
||||
|
||||
/*
|
||||
* LinToulaw_New
|
||||
* Create a new instance of ulaw_encoder_pvt.
|
||||
*
|
||||
* Results:
|
||||
* Returns a pointer to the new instance.
|
||||
*
|
||||
* Side effects:
|
||||
* None.
|
||||
*/
|
||||
|
||||
static struct ast_translator_pvt *
|
||||
lintoulaw_new ()
|
||||
{
|
||||
struct ulaw_encoder_pvt *tmp;
|
||||
tmp = malloc (sizeof (struct ulaw_encoder_pvt));
|
||||
if (tmp)
|
||||
{
|
||||
memset(tmp, 0, sizeof(*tmp));
|
||||
localusecnt++;
|
||||
ast_update_use_count ();
|
||||
tmp->tail = 0;
|
||||
}
|
||||
return (struct ast_translator_pvt *) tmp;
|
||||
}
|
||||
|
||||
/*
|
||||
* ulawToLin_FrameIn
|
||||
* Fill an input buffer with packed 4-bit ulaw values if there is room
|
||||
* left.
|
||||
*
|
||||
* Results:
|
||||
* Foo
|
||||
*
|
||||
* Side effects:
|
||||
* tmp->tail is the number of packed values in the buffer.
|
||||
*/
|
||||
|
||||
static int
|
||||
ulawtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
|
||||
{
|
||||
struct ulaw_decoder_pvt *tmp = (struct ulaw_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_mulaw[b[x]];
|
||||
|
||||
tmp->tail += f->datalen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ulawToLin_FrameOut
|
||||
* Convert 4-bit ulaw encoded signals to 16-bit signed linear.
|
||||
*
|
||||
* Results:
|
||||
* Converted signals are placed in tmp->f.data, tmp->f.datalen
|
||||
* and tmp->f.timelen are calculated.
|
||||
*
|
||||
* Side effects:
|
||||
* None.
|
||||
*/
|
||||
|
||||
static struct ast_frame *
|
||||
ulawtolin_frameout (struct ast_translator_pvt *pvt)
|
||||
{
|
||||
struct ulaw_decoder_pvt *tmp = (struct ulaw_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.timelen = tmp->tail / 8;
|
||||
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;
|
||||
}
|
||||
|
||||
/*
|
||||
* LinToulaw_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
|
||||
lintoulaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
|
||||
{
|
||||
struct ulaw_encoder_pvt *tmp = (struct ulaw_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_lin2mu[s[x]+32768];
|
||||
tmp->tail += f->datalen/2;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* LinToulaw_FrameOut
|
||||
* Convert a buffer of raw 16-bit signed linear PCM to a buffer
|
||||
* of 4-bit ulaw packed two to a byte (Big Endian).
|
||||
*
|
||||
* Results:
|
||||
* Foo
|
||||
*
|
||||
* Side effects:
|
||||
* Leftover inbuf data gets packed, tail gets updated.
|
||||
*/
|
||||
|
||||
static struct ast_frame *
|
||||
lintoulaw_frameout (struct ast_translator_pvt *pvt)
|
||||
{
|
||||
struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *) pvt;
|
||||
|
||||
if (tmp->tail) {
|
||||
tmp->f.frametype = AST_FRAME_VOICE;
|
||||
tmp->f.subclass = AST_FORMAT_ULAW;
|
||||
tmp->f.timelen = tmp->tail / 8;
|
||||
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;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* ulawToLin_Sample
|
||||
*/
|
||||
|
||||
static struct ast_frame *
|
||||
ulawtolin_sample ()
|
||||
{
|
||||
static struct ast_frame f;
|
||||
f.frametype = AST_FRAME_VOICE;
|
||||
f.subclass = AST_FORMAT_ULAW;
|
||||
f.datalen = sizeof (ulaw_slin_ex);
|
||||
f.timelen = sizeof(ulaw_slin_ex) / 8;
|
||||
f.mallocd = 0;
|
||||
f.offset = 0;
|
||||
f.src = __PRETTY_FUNCTION__;
|
||||
f.data = ulaw_slin_ex;
|
||||
return &f;
|
||||
}
|
||||
|
||||
/*
|
||||
* LinToulaw_Sample
|
||||
*/
|
||||
|
||||
static struct ast_frame *
|
||||
lintoulaw_sample ()
|
||||
{
|
||||
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.timelen = sizeof (slin_ulaw_ex) / 16;
|
||||
f.mallocd = 0;
|
||||
f.offset = 0;
|
||||
f.src = __PRETTY_FUNCTION__;
|
||||
f.data = slin_ulaw_ex;
|
||||
return &f;
|
||||
}
|
||||
|
||||
/*
|
||||
* ulaw_Destroy
|
||||
* Destroys a private workspace.
|
||||
*
|
||||
* Results:
|
||||
* It's gone!
|
||||
*
|
||||
* Side effects:
|
||||
* None.
|
||||
*/
|
||||
|
||||
static void
|
||||
ulaw_destroy (struct ast_translator_pvt *pvt)
|
||||
{
|
||||
free (pvt);
|
||||
localusecnt--;
|
||||
ast_update_use_count ();
|
||||
}
|
||||
|
||||
/*
|
||||
* The complete translator for ulawToLin.
|
||||
*/
|
||||
|
||||
static struct ast_translator ulawtolin = {
|
||||
"ulawtolin",
|
||||
AST_FORMAT_ULAW,
|
||||
AST_FORMAT_SLINEAR,
|
||||
ulawtolin_new,
|
||||
ulawtolin_framein,
|
||||
ulawtolin_frameout,
|
||||
ulaw_destroy,
|
||||
/* NULL */
|
||||
ulawtolin_sample
|
||||
};
|
||||
|
||||
/*
|
||||
* The complete translator for LinToulaw.
|
||||
*/
|
||||
|
||||
static struct ast_translator lintoulaw = {
|
||||
"lintoulaw",
|
||||
AST_FORMAT_SLINEAR,
|
||||
AST_FORMAT_ULAW,
|
||||
lintoulaw_new,
|
||||
lintoulaw_framein,
|
||||
lintoulaw_frameout,
|
||||
ulaw_destroy,
|
||||
/* NULL */
|
||||
lintoulaw_sample
|
||||
};
|
||||
|
||||
int
|
||||
unload_module (void)
|
||||
{
|
||||
int res;
|
||||
ast_pthread_mutex_lock (&localuser_lock);
|
||||
res = ast_unregister_translator (&lintoulaw);
|
||||
if (!res)
|
||||
res = ast_unregister_translator (&ulawtolin);
|
||||
if (localusecnt)
|
||||
res = -1;
|
||||
ast_pthread_mutex_unlock (&localuser_lock);
|
||||
return res;
|
||||
}
|
||||
|
||||
int
|
||||
load_module (void)
|
||||
{
|
||||
int res;
|
||||
res = ast_register_translator (&ulawtolin);
|
||||
if (!res)
|
||||
res = ast_register_translator (&lintoulaw);
|
||||
else
|
||||
ast_unregister_translator (&ulawtolin);
|
||||
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;
|
||||
}
|
Reference in New Issue