![rizzo](/assets/img/avatar_default.png)
As partly documented in loader.c and include/asterisk/module.h, modules are now expected to return all of their methods and flags into a structure 'mod_data', and are normally loaded with RTLD_NOW | RTLD_LOCAL, so symbols are resolved immediately and conflicts should be less likely. Only in a small number of cases (res_*, typically) modules are loaded RTLD_GLOBAL, so they can export symbols. The core of the change is only the two files loader.c and include/asterisk/module.h, all the rest is simply adaptation of the existing modules to the new API, a rather mechanical (but believe me, time and finger-consuming!) process whose detail you can figure out by svn diff'ing any single module. Expect some minor compilation issue after this change, please report it on mantis http://bugs.digium.com/view.php?id=6968 so we collect all the feedback in one place. I am just sorry that this change missed SVN version number 20000! git-svn-id: http://svn.digium.com/svn/asterisk/trunk@20003 f38db490-d61c-443f-a65b-d21fe96a405b
171 lines
3.9 KiB
C
171 lines
3.9 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief codec_a_mu.c - translate between alaw and ulaw directly
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*
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* \ingroup codecs
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*/
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/lock.h"
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#include "asterisk/logger.h"
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#include "asterisk/module.h"
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#include "asterisk/translate.h"
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#include "asterisk/channel.h"
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#include "asterisk/alaw.h"
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#include "asterisk/ulaw.h"
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#include "asterisk/utils.h"
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#define BUFFER_SAMPLES 8000 /* size for the translation buffers */
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static unsigned char mu2a[256];
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static unsigned char a2mu[256];
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/* Sample frame data (Mu data is okay) */
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#include "ulaw_slin_ex.h"
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/*! \brief convert frame data and store into the buffer */
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static int alawtoulaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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int x;
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unsigned char *src = f->data;
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unsigned char *dst = (unsigned char *)pvt->outbuf + pvt->samples;
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for ( x = 0 ; x < f->samples; x++)
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dst[x] = a2mu[src[x]];
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pvt->samples += f->samples;
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pvt->datalen += f->datalen;
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return 0;
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}
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/*! \brief convert frame data and store into the buffer */
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static int ulawtoalaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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int x;
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unsigned char *src = f->data;
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unsigned char *dst = (unsigned char *)pvt->outbuf + pvt->samples;
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for ( x = 0 ; x < f->samples; x++)
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dst[x] = mu2a[src[x]];
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pvt->samples += f->samples;
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pvt->datalen += f->datalen;
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return 0;
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}
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/*
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* alawToLin_Sample. Just random data, somehow...
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*/
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static struct ast_frame *alawtoulaw_sample(void)
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{
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static struct ast_frame f;
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f.frametype = AST_FRAME_VOICE;
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f.subclass = AST_FORMAT_ALAW;
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f.datalen = sizeof(ulaw_slin_ex);
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f.samples = sizeof(ulaw_slin_ex);
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f.mallocd = 0;
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f.offset = 0;
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f.src = __PRETTY_FUNCTION__;
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f.data = ulaw_slin_ex; /* XXX what ? */
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return &f;
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}
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static struct ast_frame *ulawtoalaw_sample(void)
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{
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static struct ast_frame f;
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f.frametype = AST_FRAME_VOICE;
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f.subclass = AST_FORMAT_ULAW;
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f.datalen = sizeof(ulaw_slin_ex);
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f.samples = sizeof(ulaw_slin_ex);
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f.mallocd = 0;
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f.offset = 0;
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f.src = __PRETTY_FUNCTION__;
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f.data = ulaw_slin_ex;
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return &f;
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}
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static struct ast_translator alawtoulaw = {
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.name = "alawtoulaw",
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.srcfmt = AST_FORMAT_ALAW,
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.dstfmt = AST_FORMAT_ULAW,
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.framein = alawtoulaw_framein,
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.sample = alawtoulaw_sample,
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.buffer_samples = BUFFER_SAMPLES,
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.buf_size = BUFFER_SAMPLES,
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};
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static struct ast_translator ulawtoalaw = {
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.name = "ulawtoalaw",
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.srcfmt = AST_FORMAT_ULAW,
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.dstfmt = AST_FORMAT_ALAW,
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.framein = ulawtoalaw_framein,
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.sample = ulawtoalaw_sample,
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.buffer_samples = BUFFER_SAMPLES,
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.buf_size = BUFFER_SAMPLES,
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};
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/*! \brief standard module glue */
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static int unload_module(void *mod)
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{
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int res;
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res = ast_unregister_translator(&ulawtoalaw);
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res |= ast_unregister_translator(&alawtoulaw);
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return res;
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}
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static int load_module(void *mod)
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{
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int res;
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int x;
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for (x=0;x<256;x++) {
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mu2a[x] = AST_LIN2A(AST_MULAW(x));
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a2mu[x] = AST_LIN2MU(AST_ALAW(x));
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}
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res = ast_register_translator(&alawtoulaw, mod);
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if (!res)
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res = ast_register_translator(&ulawtoalaw, mod);
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else
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ast_unregister_translator(&alawtoulaw);
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return res;
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}
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static const char *description(void)
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{
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return "A-law and Mulaw direct Coder/Decoder";
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}
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static const char *key(void)
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{
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return ASTERISK_GPL_KEY;
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}
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STD_MOD(MOD_1, NULL, NULL, NULL);
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