![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
289 lines
7.2 KiB
C
289 lines
7.2 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* The GSM code is from TOAST. Copyright information for that package is available
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* in the GSM directory.
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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 Translate between signed linear and Global System for Mobile Communications (GSM)
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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 <stdlib.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <stdio.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/translate.h"
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#include "asterisk/config.h"
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#include "asterisk/options.h"
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#include "asterisk/module.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/utils.h"
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#ifdef USE_EXTERNAL_GSM_LIB
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#include <gsm/gsm.h>
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#else
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#include "gsm/inc/gsm.h"
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#endif
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#include "../formats/msgsm.h"
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/* Sample frame data */
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#include "slin_gsm_ex.h"
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#include "gsm_slin_ex.h"
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#define BUFFER_SAMPLES 8000
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#define GSM_SAMPLES 160
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#define GSM_FRAME_LEN 33
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#define MSGSM_FRAME_LEN 65
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struct gsm_translator_pvt { /* both gsm2lin and lin2gsm */
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gsm gsm;
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int16_t buf[BUFFER_SAMPLES]; /* lin2gsm, temporary storage */
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};
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static void *gsm_new(struct ast_trans_pvt *pvt)
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{
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struct gsm_translator_pvt *tmp = pvt->pvt;
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if (!(tmp->gsm = gsm_create()))
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return NULL;
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return tmp;
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}
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static struct ast_frame *lintogsm_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_SLINEAR;
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f.datalen = sizeof(slin_gsm_ex);
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/* Assume 8000 Hz */
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f.samples = sizeof(slin_gsm_ex)/2;
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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 = slin_gsm_ex;
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return &f;
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}
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static struct ast_frame *gsmtolin_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_GSM;
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f.datalen = sizeof(gsm_slin_ex);
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/* All frames are 20 ms long */
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f.samples = GSM_SAMPLES;
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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 = gsm_slin_ex;
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return &f;
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}
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/*! \brief decode and store in outbuf. */
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static int gsmtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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struct gsm_translator_pvt *tmp = pvt->pvt;
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int x;
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int16_t *dst = (int16_t *)pvt->outbuf;
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/* guess format from frame len. 65 for MSGSM, 33 for regular GSM */
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int flen = (f->datalen % MSGSM_FRAME_LEN == 0) ?
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MSGSM_FRAME_LEN : GSM_FRAME_LEN;
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for (x=0; x < f->datalen; x += flen) {
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unsigned char data[2 * GSM_FRAME_LEN];
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char *src;
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int len;
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if (flen == MSGSM_FRAME_LEN) {
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len = 2*GSM_SAMPLES;
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src = data;
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/* Translate MSGSM format to Real GSM format before feeding in */
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/* XXX what's the point here! we should just work
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* on the full format.
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*/
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conv65(f->data + x, data);
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} else {
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len = GSM_SAMPLES;
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src = f->data + x;
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}
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/* XXX maybe we don't need to check */
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if (pvt->samples + len > BUFFER_SAMPLES) {
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ast_log(LOG_WARNING, "Out of buffer space\n");
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return -1;
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}
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if (gsm_decode(tmp->gsm, src, dst + pvt->samples)) {
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ast_log(LOG_WARNING, "Invalid GSM data (1)\n");
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return -1;
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}
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pvt->samples += GSM_SAMPLES;
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pvt->datalen += 2 * GSM_SAMPLES;
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if (flen == MSGSM_FRAME_LEN) {
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if (gsm_decode(tmp->gsm, data + GSM_FRAME_LEN, dst + pvt->samples)) {
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ast_log(LOG_WARNING, "Invalid GSM data (2)\n");
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return -1;
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}
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pvt->samples += GSM_SAMPLES;
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pvt->datalen += 2 * GSM_SAMPLES;
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}
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}
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return 0;
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}
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/*! \brief store samples into working buffer for later decode */
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static int lintogsm_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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struct gsm_translator_pvt *tmp = pvt->pvt;
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/* XXX We should look at how old the rest of our stream is, and if it
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is too old, then we should overwrite it entirely, otherwise we can
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get artifacts of earlier talk that do not belong */
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if (pvt->samples + f->samples > BUFFER_SAMPLES) {
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ast_log(LOG_WARNING, "Out of buffer space\n");
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return -1;
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}
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memcpy(tmp->buf + pvt->samples, f->data, f->datalen);
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pvt->samples += f->samples;
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return 0;
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}
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/*! \brief encode and produce a frame */
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static struct ast_frame *lintogsm_frameout(struct ast_trans_pvt *pvt)
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{
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struct gsm_translator_pvt *tmp = pvt->pvt;
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int datalen = 0;
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int samples = 0;
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/* We can't work on anything less than a frame in size */
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if (pvt->samples < GSM_SAMPLES)
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return NULL;
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while (pvt->samples >= GSM_SAMPLES) {
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/* Encode a frame of data */
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gsm_encode(tmp->gsm, tmp->buf, (gsm_byte *)pvt->outbuf + datalen);
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datalen += GSM_FRAME_LEN;
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samples += GSM_SAMPLES;
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pvt->samples -= GSM_SAMPLES;
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/* Move the data at the end of the buffer to the front */
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if (pvt->samples)
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memmove(tmp->buf, tmp->buf + GSM_SAMPLES, pvt->samples * 2);
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}
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return ast_trans_frameout(pvt, datalen, samples);
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}
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static void gsm_destroy_stuff(struct ast_trans_pvt *pvt)
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{
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struct gsm_translator_pvt *tmp = pvt->pvt;
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if (tmp->gsm)
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gsm_destroy(tmp->gsm);
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}
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static struct ast_translator gsmtolin = {
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.name = "gsmtolin",
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.srcfmt = AST_FORMAT_GSM,
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.dstfmt = AST_FORMAT_SLINEAR,
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.newpvt = gsm_new,
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.framein = gsmtolin_framein,
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.destroy = gsm_destroy_stuff,
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.sample = gsmtolin_sample,
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.buffer_samples = BUFFER_SAMPLES,
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.buf_size = BUFFER_SAMPLES * 2,
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.desc_size = sizeof (struct gsm_translator_pvt ),
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.plc_samples = GSM_SAMPLES,
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};
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static struct ast_translator lintogsm = {
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.name = "lintogsm",
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.srcfmt = AST_FORMAT_SLINEAR,
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.dstfmt = AST_FORMAT_GSM,
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.newpvt = gsm_new,
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.framein = lintogsm_framein,
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.frameout = lintogsm_frameout,
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.destroy = gsm_destroy_stuff,
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.sample = lintogsm_sample,
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.desc_size = sizeof (struct gsm_translator_pvt ),
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.buf_size = (BUFFER_SAMPLES * GSM_FRAME_LEN + GSM_SAMPLES - 1)/GSM_SAMPLES,
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};
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static void parse_config(void)
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{
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struct ast_variable *var;
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struct ast_config *cfg = ast_config_load("codecs.conf");
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if (!cfg)
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return;
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for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
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if (!strcasecmp(var->name, "genericplc")) {
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gsmtolin.useplc = ast_true(var->value) ? 1 : 0;
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if (option_verbose > 2)
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ast_verbose(VERBOSE_PREFIX_3 "codec_gsm: %susing generic PLC\n", gsmtolin.useplc ? "" : "not ");
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}
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}
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ast_config_destroy(cfg);
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}
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/*! \brief standard module glue */
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static int reload(void *mod)
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{
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parse_config();
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return 0;
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}
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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(&lintogsm);
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if (!res)
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res = ast_unregister_translator(&gsmtolin);
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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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parse_config();
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res = ast_register_translator(&gsmtolin, mod);
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if (!res)
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res=ast_register_translator(&lintogsm, mod);
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else
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ast_unregister_translator(&gsmtolin);
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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 "GSM/PCM16 (signed linear) Codec Translator";
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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, reload, NULL, NULL);
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