153 lines
3.2 KiB
C
153 lines
3.2 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_ulaw.c - translate between signed linear and ulaw
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*
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* \ingroup codecs
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/module.h"
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#include "asterisk/config.h"
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#include "asterisk/translate.h"
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#include "asterisk/ulaw.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 */
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#include "asterisk/slin.h"
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#include "ex_ulaw.h"
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/*! \brief convert and store samples in outbuf */
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static int ulawtolin_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.ptr;
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int16_t *dst = pvt->outbuf.i16 + pvt->samples;
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pvt->samples += i;
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pvt->datalen += i * 2; /* 2 bytes/sample */
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/* convert and copy in outbuf */
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while (i--)
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*dst++ = AST_MULAW(*src++);
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return 0;
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}
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/*! \brief convert and store samples in outbuf */
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static int lintoulaw_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.c + pvt->samples;
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int16_t *src = f->data.ptr;
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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_LIN2MU(*src++);
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return 0;
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}
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/*!
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* \brief The complete translator for ulawToLin.
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*/
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static struct ast_translator ulawtolin = {
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.name = "ulawtolin",
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.src_codec = {
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.name = "ulaw",
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.type = AST_MEDIA_TYPE_AUDIO,
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.sample_rate = 8000,
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},
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.dst_codec = {
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.name = "slin",
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.type = AST_MEDIA_TYPE_AUDIO,
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.sample_rate = 8000,
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},
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.format = "slin",
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.framein = ulawtolin_framein,
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.sample = ulaw_sample,
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.buffer_samples = BUFFER_SAMPLES,
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.buf_size = BUFFER_SAMPLES * 2,
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};
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/*!
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* \brief The complete translator for LinToulaw.
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*/
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static struct ast_translator lintoulaw = {
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.name = "lintoulaw",
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.src_codec = {
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.name = "slin",
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.type = AST_MEDIA_TYPE_AUDIO,
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.sample_rate = 8000,
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},
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.dst_codec = {
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.name = "ulaw",
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.type = AST_MEDIA_TYPE_AUDIO,
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.sample_rate = 8000,
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},
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.format = "ulaw",
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.framein = lintoulaw_framein,
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.sample = slin8_sample,
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.buf_size = BUFFER_SAMPLES,
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.buffer_samples = BUFFER_SAMPLES,
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};
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static int unload_module(void)
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{
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int res;
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res = ast_unregister_translator(&lintoulaw);
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res |= ast_unregister_translator(&ulawtolin);
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return res;
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}
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static int load_module(void)
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{
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int res;
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res = ast_register_translator(&ulawtolin);
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res |= ast_register_translator(&lintoulaw);
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if (res) {
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unload_module();
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return AST_MODULE_LOAD_DECLINE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "mu-Law Coder/Decoder",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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);
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