mirror of
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fbdc8ce317
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8381 65c4cc65-6c06-0410-ace0-fbb531ad65f3
418 lines
9.4 KiB
C
418 lines
9.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* The G.723.1 code is not included in the Asterisk distribution because
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* it is covered with patents, and in spite of statements to the contrary,
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* the "technology" is extremely expensive to license.
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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 G.723.1
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*
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* \ingroup codecs
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*/
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#define TYPE_HIGH 0x0
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#define TYPE_LOW 0x1
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#define TYPE_SILENCE 0x2
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#define TYPE_DONTSEND 0x3
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#define TYPE_MASK 0x3
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#include <sys/types.h>
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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/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 ANNEX_B
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#include "g723.1b/typedef2.h"
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#include "g723.1b/cst2.h"
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#include "g723.1b/coder2.h"
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#include "g723.1b/decod2.h"
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#include "g723.1b/deccng2.h"
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#include "g723.1b/codcng2.h"
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#include "g723.1b/vad2.h"
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#else
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#include "g723.1/typedef.h"
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#include "g723.1/cst_lbc.h"
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#include "g723.1/coder.h"
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#include "g723.1/decod.h"
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#include "g723.1/dec_cng.h"
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#include "g723.1/cod_cng.h"
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#include "g723.1/vad.h"
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#endif
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/* Sample frame data */
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#include "slin_g723_ex.h"
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#include "g723_slin_ex.h"
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AST_MUTEX_DEFINE_STATIC(localuser_lock);
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static int localusecnt=0;
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#ifdef ANNEX_B
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static char *tdesc = "Annex B (floating point) G.723.1/PCM16 Codec Translator";
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#else
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static char *tdesc = "Annex A (fixed point) G.723.1/PCM16 Codec Translator";
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#endif
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/* Globals */
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Flag UsePf = True;
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Flag UseHp = True;
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Flag UseVx = True;
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enum Crate WrkRate = Rate63;
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struct g723_encoder_pvt {
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struct cod_state cod;
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struct ast_frame f;
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/* Space to build offset */
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char offset[AST_FRIENDLY_OFFSET];
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/* Buffer for our outgoing frame */
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char outbuf[8000];
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/* Enough to store a full second */
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short buf[8000];
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int tail;
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};
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struct g723_decoder_pvt {
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struct dec_state dec;
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struct ast_frame f;
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/* Space to build offset */
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char offset[AST_FRIENDLY_OFFSET];
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/* Enough to store a full second */
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short buf[8000];
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int tail;
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};
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static struct ast_translator_pvt *g723tolin_new(void)
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{
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struct g723_decoder_pvt *tmp;
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if ((tmp = ast_malloc(sizeof(*tmp)))) {
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Init_Decod(&tmp->dec);
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Init_Dec_Cng(&tmp->dec);
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tmp->tail = 0;
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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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static struct ast_frame *lintog723_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_g723_ex);
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/* Assume 8000 Hz */
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f.samples = sizeof(slin_g723_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_g723_ex;
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return &f;
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}
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static struct ast_frame *g723tolin_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_G723_1;
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f.datalen = sizeof(g723_slin_ex);
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/* All frames are 30 ms long */
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f.samples = 240;
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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 = g723_slin_ex;
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return &f;
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}
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static struct ast_translator_pvt *lintog723_new(void)
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{
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struct g723_encoder_pvt *tmp;
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if ((tmp = ast_malloc(sizeof(*tmp)))) {
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Init_Coder(&tmp->cod);
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/* Init Comfort Noise Functions */
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if( UseVx ) {
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Init_Vad(&tmp->cod);
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Init_Cod_Cng(&tmp->cod);
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}
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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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static struct ast_frame *g723tolin_frameout(struct ast_translator_pvt *pvt)
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{
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struct g723_decoder_pvt *tmp = (struct g723_decoder_pvt *)pvt;
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if (!tmp->tail)
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return NULL;
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/* Signed linear is no particular frame size, so just send whatever
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we have in the buffer in one lump sum */
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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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/* Assume 8000 Hz */
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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->buf;
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/* Reset tail pointer */
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tmp->tail = 0;
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#if 0
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/* Save the frames */
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{
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static int fd2 = -1;
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if (fd2 == -1) {
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fd2 = open("g723.example", O_WRONLY | O_CREAT | O_TRUNC, 0644);
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}
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write(fd2, tmp->f.data, tmp->f.datalen);
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}
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#endif
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return &tmp->f;
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}
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static int g723_len(unsigned char buf)
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{
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switch(buf & TYPE_MASK) {
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case TYPE_DONTSEND:
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return 0;
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break;
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case TYPE_SILENCE:
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return 4;
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break;
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case TYPE_HIGH:
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return 24;
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break;
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case TYPE_LOW:
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return 20;
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break;
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default:
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ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", buf & TYPE_MASK);
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}
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return -1;
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}
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static int g723tolin_framein(struct ast_translator_pvt *pvt, struct ast_frame *f)
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{
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struct g723_decoder_pvt *tmp = (struct g723_decoder_pvt *)pvt;
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int len = 0;
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int res;
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#ifdef ANNEX_B
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FLOAT tmpdata[Frame];
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int x;
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#endif
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while(len < f->datalen) {
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/* Assuming there's space left, decode into the current buffer at
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the tail location */
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res = g723_len(((unsigned char *)f->data + len)[0]);
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if (res < 0) {
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ast_log(LOG_WARNING, "Invalid data\n");
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return -1;
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}
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if (res + len > f->datalen) {
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ast_log(LOG_WARNING, "Measured length exceeds frame length\n");
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return -1;
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}
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if (tmp->tail + Frame < sizeof(tmp->buf)/2) {
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#ifdef ANNEX_B
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Decod(&tmp->dec, tmpdata, f->data + len, 0);
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for (x=0;x<Frame;x++)
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(tmp->buf + tmp->tail)[x] = (short)(tmpdata[x]);
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#else
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Decod(&tmp->dec, tmp->buf + tmp->tail, f->data + len, 0);
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#endif
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tmp->tail+=Frame;
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} else {
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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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len += res;
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}
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return 0;
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}
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static int lintog723_framein(struct ast_translator_pvt *pvt, struct ast_frame *f)
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{
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/* Just add the frames to our stream */
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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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struct g723_encoder_pvt *tmp = (struct g723_encoder_pvt *)pvt;
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if (tmp->tail + f->datalen/2 < sizeof(tmp->buf) / 2) {
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memcpy(&tmp->buf[tmp->tail], f->data, f->datalen);
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tmp->tail += f->datalen/2;
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} else {
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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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return 0;
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}
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static struct ast_frame *lintog723_frameout(struct ast_translator_pvt *pvt)
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{
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struct g723_encoder_pvt *tmp = (struct g723_encoder_pvt *)pvt;
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#ifdef ANNEX_B
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int x;
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FLOAT tmpdata[Frame];
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#endif
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int cnt=0;
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/* We can't work on anything less than a frame in size */
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if (tmp->tail < Frame)
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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_G723_1;
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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.samples = 0;
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tmp->f.mallocd = 0;
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while(tmp->tail >= Frame) {
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/* Encode a frame of data */
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if (cnt + 24 >= sizeof(tmp->outbuf)) {
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ast_log(LOG_WARNING, "Out of buffer space\n");
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return NULL;
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}
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#ifdef ANNEX_B
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for (x=0;x<Frame;x++)
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tmpdata[x] = tmp->buf[x];
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Coder(&tmp->cod, tmpdata, tmp->outbuf + cnt);
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#else
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Coder(&tmp->cod, tmp->buf, tmp->outbuf + cnt);
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#endif
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/* Assume 8000 Hz */
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tmp->f.samples += 240;
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cnt += g723_len(tmp->outbuf[cnt]);
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tmp->tail -= Frame;
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/* Move the data at the end of the buffer to the front */
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if (tmp->tail)
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memmove(tmp->buf, tmp->buf + Frame, tmp->tail * 2);
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}
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tmp->f.datalen = cnt;
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tmp->f.data = tmp->outbuf;
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#if 0
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/* Save to a g723 sample output file... */
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{
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static int fd = -1;
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int delay = htonl(30);
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short size;
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if (fd < 0)
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fd = open("trans.g723", O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (fd < 0)
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ast_log(LOG_WARNING, "Unable to create demo\n");
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write(fd, &delay, 4);
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size = htons(tmp->f.datalen);
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write(fd, &size, 2);
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write(fd, tmp->f.data, tmp->f.datalen);
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}
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#endif
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return &tmp->f;
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}
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static void g723_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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static struct ast_translator g723tolin =
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#ifdef ANNEX_B
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{ "g723tolinb",
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#else
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{ "g723tolin",
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#endif
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AST_FORMAT_G723_1, AST_FORMAT_SLINEAR,
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g723tolin_new,
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g723tolin_framein,
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g723tolin_frameout,
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g723_destroy,
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g723tolin_sample
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};
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static struct ast_translator lintog723 =
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#ifdef ANNEX_B
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{ "lintog723b",
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#else
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{ "lintog723",
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#endif
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AST_FORMAT_SLINEAR, AST_FORMAT_G723_1,
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lintog723_new,
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lintog723_framein,
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lintog723_frameout,
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g723_destroy,
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lintog723_sample
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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(&lintog723);
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if (!res)
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res = ast_unregister_translator(&g723tolin);
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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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res=ast_register_translator(&g723tolin);
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if (!res)
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res=ast_register_translator(&lintog723);
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else
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ast_unregister_translator(&g723tolin);
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return res;
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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(void)
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{
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return ASTERISK_GPL_KEY;
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}
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