git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@32846 65c4cc65-6c06-0410-ace0-fbb531ad65f3
192 lines
4.3 KiB
C
192 lines
4.3 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_alaw.c - translate between signed linear and alaw
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*
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* \ingroup codecs
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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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/lock.h"
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#include "asterisk/logger.h"
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#include "asterisk/module.h"
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#include "asterisk/config.h"
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#include "asterisk/options.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/utils.h"
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#define BUFFER_SAMPLES 8096 /* size for the translation buffers */
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/* Sample frame data (Mu data is okay) */
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#include "slin_ulaw_ex.h"
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#include "ulaw_slin_ex.h"
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/*! \brief decode frame into lin and fill output buffer. */
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static int alawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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int i = f->samples;
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unsigned char *src = f->data;
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int16_t *dst = (int16_t *)pvt->outbuf + pvt->samples;
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pvt->samples += i;
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pvt->datalen += i * 2; /* 2 bytes/sample */
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while (i--)
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*dst++ = AST_ALAW(*src++);
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return 0;
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}
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/*! \brief convert and store input samples in output buffer */
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static int lintoalaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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int i = f->samples;
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char *dst = pvt->outbuf + pvt->samples;
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int16_t *src = f->data;
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pvt->samples += i;
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pvt->datalen += i; /* 1 byte/sample */
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while (i--)
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*dst++ = AST_LIN2A(*src++);
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return 0;
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}
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/*! \brief alawToLin_Sample */
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static struct ast_frame *alawtolin_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;
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return &f;
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}
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/*! \brief LinToalaw_Sample */
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static struct ast_frame *lintoalaw_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_ulaw_ex);
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f.samples = sizeof(slin_ulaw_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_ulaw_ex;
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return &f;
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}
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static struct ast_translator alawtolin = {
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.name = "alawtolin",
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.srcfmt = AST_FORMAT_ALAW,
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.dstfmt = AST_FORMAT_SLINEAR,
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.framein = alawtolin_framein,
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.sample = alawtolin_sample,
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.buffer_samples = BUFFER_SAMPLES,
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.buf_size = BUFFER_SAMPLES * 2,
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.plc_samples = 160,
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};
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static struct ast_translator lintoalaw = {
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"lintoalaw",
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.srcfmt = AST_FORMAT_SLINEAR,
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.dstfmt = AST_FORMAT_ALAW,
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.framein = lintoalaw_framein,
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.sample = lintoalaw_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 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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alawtolin.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_alaw: %susing generic PLC\n", alawtolin.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 stuff */
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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(&lintoalaw);
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res |= ast_unregister_translator(&alawtolin);
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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(&alawtolin, mod);
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if (!res)
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res = ast_register_translator(&lintoalaw, mod);
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else
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ast_unregister_translator(&alawtolin);
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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 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, reload, NULL, NULL);
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