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fbdc8ce317
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8381 65c4cc65-6c06-0410-ace0-fbb531ad65f3
429 lines
8.5 KiB
C
429 lines
8.5 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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#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/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/ulaw.h"
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#include "asterisk/utils.h"
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#define BUFFER_SIZE 8096 /* size for the translation buffers */
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AST_MUTEX_DEFINE_STATIC(localuser_lock);
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static int localusecnt = 0;
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static char *tdesc = "Mu-law Coder/Decoder";
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static int useplc = 0;
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/* Sample frame data */
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#include "slin_ulaw_ex.h"
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#include "ulaw_slin_ex.h"
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/*!
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* \brief Private workspace for translating signed linear signals to ulaw.
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*/
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struct ulaw_encoder_pvt
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{
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struct ast_frame f;
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char offset[AST_FRIENDLY_OFFSET]; /*!< Space to build offset */
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unsigned char outbuf[BUFFER_SIZE]; /*!< Encoded ulaw, two nibbles to a word */
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int tail;
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};
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/*!
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* \brief Private workspace for translating ulaw signals to signed linear.
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*/
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struct ulaw_decoder_pvt
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{
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struct ast_frame f;
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char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
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short outbuf[BUFFER_SIZE]; /* Decoded signed linear values */
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int tail;
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plc_state_t plc;
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};
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/*!
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* \brief ulawToLin_New
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* Create a new instance of ulaw_decoder_pvt.
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*
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* Results:
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* Returns a pointer to the new instance.
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*
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* Side effects:
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* None.
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*/
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static struct ast_translator_pvt *ulawtolin_new(void)
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{
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struct ulaw_decoder_pvt *tmp;
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if ((tmp = ast_calloc(1, sizeof(*tmp)))) {
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tmp->tail = 0;
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plc_init(&tmp->plc);
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localusecnt++;
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ast_update_use_count();
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}
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return (struct ast_translator_pvt *)tmp;
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}
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/*!
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* \brief LinToulaw_New
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* Create a new instance of ulaw_encoder_pvt.
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*
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* Results:
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* Returns a pointer to the new instance.
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*
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* Side effects:
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* None.
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*/
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static struct ast_translator_pvt *lintoulaw_new(void)
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{
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struct ulaw_encoder_pvt *tmp;
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if ((tmp = ast_calloc(1, sizeof(*tmp)))) {
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localusecnt++;
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ast_update_use_count();
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tmp->tail = 0;
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}
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return (struct ast_translator_pvt *)tmp;
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}
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/*!
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* \brief ulawToLin_FrameIn
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* Fill an input buffer with packed 4-bit ulaw values if there is room
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* left.
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*
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* Results:
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* Foo
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*
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* Side effects:
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* tmp->tail is the number of packed values in the buffer.
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*/
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static int ulawtolin_framein(struct ast_translator_pvt *pvt, struct ast_frame *f)
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{
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struct ulaw_decoder_pvt *tmp = (struct ulaw_decoder_pvt *)pvt;
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int x;
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unsigned char *b;
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if(f->datalen == 0) { /* perform PLC with nominal framesize of 20ms/160 samples */
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if((tmp->tail + 160) * 2 > sizeof(tmp->outbuf)) {
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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(useplc) {
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plc_fillin(&tmp->plc, tmp->outbuf+tmp->tail, 160);
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tmp->tail += 160;
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}
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return 0;
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}
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if ((tmp->tail + f->datalen) * 2 > sizeof(tmp->outbuf)) {
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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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/* Reset ssindex and signal to frame's specified values */
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b = f->data;
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for (x=0;x<f->datalen;x++)
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tmp->outbuf[tmp->tail + x] = AST_MULAW(b[x]);
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if(useplc)
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plc_rx(&tmp->plc, tmp->outbuf+tmp->tail, f->datalen);
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tmp->tail += f->datalen;
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return 0;
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}
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/*!
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* \brief ulawToLin_FrameOut
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* Convert 4-bit ulaw encoded signals to 16-bit signed linear.
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*
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* Results:
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* Converted signals are placed in tmp->f.data, tmp->f.datalen
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* and tmp->f.samples are calculated.
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*
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* Side effects:
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* None.
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*/
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static struct ast_frame *ulawtolin_frameout(struct ast_translator_pvt *pvt)
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{
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struct ulaw_decoder_pvt *tmp = (struct ulaw_decoder_pvt *)pvt;
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if (!tmp->tail)
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return NULL;
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tmp->f.frametype = AST_FRAME_VOICE;
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tmp->f.subclass = AST_FORMAT_SLINEAR;
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tmp->f.datalen = tmp->tail * 2;
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tmp->f.samples = tmp->tail;
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tmp->f.mallocd = 0;
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tmp->f.offset = AST_FRIENDLY_OFFSET;
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tmp->f.src = __PRETTY_FUNCTION__;
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tmp->f.data = tmp->outbuf;
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tmp->tail = 0;
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return &tmp->f;
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}
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/*!
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* \brief LinToulaw_FrameIn
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* Fill an input buffer with 16-bit signed linear PCM values.
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*
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* Results:
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* None.
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*
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* Side effects:
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* tmp->tail is number of signal values in the input buffer.
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*/
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static int lintoulaw_framein(struct ast_translator_pvt *pvt, struct ast_frame *f)
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{
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struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *)pvt;
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int x;
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short *s;
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if (tmp->tail + f->datalen / 2 >= sizeof(tmp->outbuf)) {
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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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s = f->data;
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for (x=0;x<f->datalen/2;x++)
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tmp->outbuf[x+tmp->tail] = AST_LIN2MU(s[x]);
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tmp->tail += f->datalen/2;
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return 0;
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}
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/*!
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* \brief LinToulaw_FrameOut
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* Convert a buffer of raw 16-bit signed linear PCM to a buffer
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* of 4-bit ulaw packed two to a byte (Big Endian).
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*
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* Results:
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* Foo
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*
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* Side effects:
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* Leftover inbuf data gets packed, tail gets updated.
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*/
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static struct ast_frame *lintoulaw_frameout(struct ast_translator_pvt *pvt)
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{
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struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *)pvt;
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if (tmp->tail) {
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tmp->f.frametype = AST_FRAME_VOICE;
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tmp->f.subclass = AST_FORMAT_ULAW;
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tmp->f.samples = tmp->tail;
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tmp->f.mallocd = 0;
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tmp->f.offset = AST_FRIENDLY_OFFSET;
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tmp->f.src = __PRETTY_FUNCTION__;
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tmp->f.data = tmp->outbuf;
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tmp->f.datalen = tmp->tail;
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tmp->tail = 0;
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return &tmp->f;
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} else
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return NULL;
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}
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/*!
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* \brief ulawToLin_Sample
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*/
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static struct ast_frame *ulawtolin_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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/*!
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* \brief LinToulaw_Sample
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*/
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static struct ast_frame *lintoulaw_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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/* Assume 8000 Hz */
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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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/*!
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* \brief ulaw_Destroy
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* Destroys a private workspace.
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*
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* Results:
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* It's gone!
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*
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* Side effects:
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* None.
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*/
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static void ulaw_destroy(struct ast_translator_pvt *pvt)
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{
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free(pvt);
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localusecnt--;
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ast_update_use_count();
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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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"ulawtolin",
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AST_FORMAT_ULAW,
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AST_FORMAT_SLINEAR,
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ulawtolin_new,
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ulawtolin_framein,
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ulawtolin_frameout,
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ulaw_destroy,
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/* NULL */
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ulawtolin_sample
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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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"lintoulaw",
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AST_FORMAT_SLINEAR,
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AST_FORMAT_ULAW,
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lintoulaw_new,
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lintoulaw_framein,
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lintoulaw_frameout,
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ulaw_destroy,
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/* NULL */
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lintoulaw_sample
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};
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static void parse_config(void)
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{
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struct ast_config *cfg;
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struct ast_variable *var;
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if ((cfg = ast_config_load("codecs.conf"))) {
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if ((var = ast_variable_browse(cfg, "plc"))) {
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while (var) {
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if (!strcasecmp(var->name, "genericplc")) {
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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_ulaw: %susing generic PLC\n", useplc ? "" : "not ");
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}
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var = var->next;
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}
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}
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ast_config_destroy(cfg);
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}
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}
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int reload(void)
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{
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parse_config();
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return 0;
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}
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int unload_module(void)
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{
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int res;
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ast_mutex_lock(&localuser_lock);
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res = ast_unregister_translator(&lintoulaw);
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if (!res)
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res = ast_unregister_translator(&ulawtolin);
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if (localusecnt)
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res = -1;
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ast_mutex_unlock(&localuser_lock);
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return res;
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}
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int load_module(void)
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{
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int res;
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parse_config();
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res = ast_register_translator(&ulawtolin);
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if (!res)
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res = ast_register_translator(&lintoulaw);
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else
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ast_unregister_translator(&ulawtolin);
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return res;
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}
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/*
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* Return a description of this module.
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*/
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char *description(void)
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{
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return tdesc;
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}
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int usecount(void)
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{
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int res;
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STANDARD_USECOUNT(res);
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return res;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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