c26c190711
This patch is the foundation of an entire new way of looking at media in Asterisk. The code present in this patch is everything required to complete phase1 of my Media Architecture proposal. For more information about this project visit the link below. https://wiki.asterisk.org/wiki/display/AST/Media+Architecture+Proposal The primary function of this patch is to convert all the usages of format bitfields in Asterisk to use the new format and format_cap APIs. Functionally no change in behavior should be present in this patch. Thanks to twilson and russell for all the time they spent reviewing these changes. Review: https://reviewboard.asterisk.org/r/1083/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@306010 65c4cc65-6c06-0410-ace0-fbb531ad65f3
131 lines
3 KiB
C
131 lines
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_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 "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/translate.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 */
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#include "ex_ulaw.h"
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#include "ex_alaw.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 = f->samples;
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unsigned char *src = f->data.ptr;
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unsigned char *dst = pvt->outbuf.uc + pvt->samples;
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pvt->samples += x;
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pvt->datalen += x;
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while (x--)
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*dst++ = a2mu[*src++];
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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 = f->samples;
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unsigned char *src = f->data.ptr;
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unsigned char *dst = pvt->outbuf.uc + pvt->samples;
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pvt->samples += x;
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pvt->datalen += x;
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while (x--)
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*dst++ = mu2a[*src++];
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return 0;
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}
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static struct ast_translator alawtoulaw = {
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.name = "alawtoulaw",
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.framein = alawtoulaw_framein,
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.sample = alaw_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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.framein = ulawtoalaw_framein,
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.sample = ulaw_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)
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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)
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{
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int res;
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int x;
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ast_format_set(&alawtoulaw.src_format, AST_FORMAT_ALAW, 0);
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ast_format_set(&alawtoulaw.dst_format, AST_FORMAT_ULAW, 0);
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ast_format_set(&ulawtoalaw.src_format, AST_FORMAT_ULAW, 0);
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ast_format_set(&ulawtoalaw.dst_format, AST_FORMAT_ALAW, 0);
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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);
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if (!res)
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res = ast_register_translator(&ulawtoalaw);
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else
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ast_unregister_translator(&alawtoulaw);
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if (res)
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return AST_MODULE_LOAD_FAILURE;
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "A-law and Mulaw direct Coder/Decoder");
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