mirror of https://github.com/asterisk/asterisk
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@35745 65c4cc65-6c06-0410-ace0-fbb531ad65f31.4
Kevin P. Fleming
19 years ago
parent
886350c637
commit
b8518110da
@ -0,0 +1,406 @@
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Zaptel native transcoding support
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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* Kevin P. Fleming <kpfleming@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 various formats natively through Zaptel transcoding
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*
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* \ingroup codecs
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*/
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/*** MODULEINFO
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<depend>zaptel</depend>
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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 <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 <sys/ioctl.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <linux/zaptel.h>
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#include "asterisk/lock.h"
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#include "asterisk/translate.h"
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#include "asterisk/config.h"
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#include "asterisk/options.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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#include "asterisk/linkedlists.h"
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#define BUFFER_SAMPLES 8000
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static unsigned int global_useplc = 0;
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struct format_map {
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unsigned int map[32][32];
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};
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static struct format_map global_format_map = { { { 0 } } };
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struct translator {
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struct ast_translator t;
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AST_LIST_ENTRY(translator) entry;
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};
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static AST_LIST_HEAD_STATIC(translators, translator);
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struct pvt {
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int fd;
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int fake;
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struct zt_transcode_header *hdr;
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struct ast_frame f;
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};
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static int zap_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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struct pvt *ztp = pvt->pvt;
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struct zt_transcode_header *hdr = ztp->hdr;
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if (!f->subclass) {
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/* Fake a return frame for calculation purposes */
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ztp->fake = 2;
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pvt->samples = f->samples;
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return 0;
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}
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if (!hdr->srclen)
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/* Copy at front of buffer */
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hdr->srcoffset = 0;
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if (hdr->srclen + f->datalen > sizeof(hdr->srcdata)) {
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ast_log(LOG_WARNING, "Out of space for codec translation!\n");
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return -1;
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}
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if (hdr->srclen + f->datalen + hdr->srcoffset > sizeof(hdr->srcdata)) {
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/* Very unlikely */
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memmove(hdr->srcdata, hdr->srcdata + hdr->srcoffset, hdr->srclen);
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hdr->srcoffset = 0;
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}
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memcpy(hdr->srcdata + hdr->srcoffset, f->data, f->datalen);
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hdr->srclen += f->datalen;
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pvt->samples += f->samples;
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return -1;
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}
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static struct ast_frame *zap_frameout(struct ast_trans_pvt *pvt)
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{
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struct pvt *ztp = pvt->pvt;
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struct zt_transcode_header *hdr = ztp->hdr;
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unsigned int x;
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if (ztp->fake == 2) {
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ztp->fake = 1;
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ztp->f.frametype = AST_FRAME_VOICE;
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ztp->f.subclass = 0;
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ztp->f.samples = 160;
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ztp->f.data = NULL;
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ztp->f.offset = 0;
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ztp->f.datalen = 0;
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ztp->f.mallocd = 0;
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pvt->samples = 0;
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} else if (ztp->fake == 1) {
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return NULL;
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} else if (!hdr->srclen) {
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return NULL;
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} else {
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hdr->dstoffset = 0;
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hdr->dstlen = 0;
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x = ZT_TCOP_TRANSCODE;
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if (ioctl(ztp->fd, ZT_TRANSCODE_OP, &x))
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ast_log(LOG_WARNING, "Failed to transcode: %s\n", strerror(errno));
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if (!hdr->dstlen)
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return NULL;
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ztp->f.frametype = AST_FRAME_VOICE;
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ztp->f.subclass = hdr->dstfmt;
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ztp->f.samples = hdr->dstsamples;
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ztp->f.data = hdr->dstdata + hdr->dstoffset;
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ztp->f.offset = hdr->dstoffset;
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ztp->f.datalen = hdr->dstlen;
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ztp->f.mallocd = 0;
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pvt->samples -= ztp->f.samples;
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}
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return &ztp->f;
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}
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static void zap_destroy(struct ast_trans_pvt *pvt)
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{
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struct pvt *ztp = pvt->pvt;
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munmap(ztp->hdr, sizeof(*ztp->hdr));
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close(ztp->fd);
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}
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static struct ast_trans_pvt *zap_translate(struct ast_trans_pvt *pvt, int dest, int source)
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{
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/* Request translation through zap if possible */
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int fd;
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unsigned int x = ZT_TCOP_RESET;
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struct pvt *ztp = pvt->pvt;
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struct zt_transcode_header *hdr;
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if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0)
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return NULL;
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if ((hdr = mmap(NULL, sizeof(*hdr), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
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ast_log(LOG_ERROR, "Memory Map failed for transcoding (%s)\n", strerror(errno));
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close(fd);
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return NULL;
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}
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if (hdr->magic != ZT_TRANSCODE_MAGIC) {
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ast_log(LOG_ERROR, "Transcoder header (%08x) wasn't magic. Abandoning\n", hdr->magic);
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munmap(hdr, sizeof(*hdr));
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close(fd);
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return NULL;
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}
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hdr->srcfmt = (1 << source);
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hdr->dstfmt = (1 << dest);
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if (ioctl(fd, ZT_TRANSCODE_OP, &x)) {
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ast_log(LOG_ERROR, "Unable to attach transcoder: %s\n", strerror(errno));
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munmap(hdr, sizeof(*hdr));
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close(fd);
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return NULL;
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}
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ztp = pvt->pvt;
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ztp->fd = fd;
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ztp->hdr = hdr;
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return pvt;
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}
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static void *zap_new(struct ast_trans_pvt *pvt)
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{
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return zap_translate(pvt, pvt->t->dstfmt, pvt->t->srcfmt);
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}
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static struct ast_frame *fakesrc_sample(void)
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{
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/* Don't bother really trying to test hardware ones. */
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static struct ast_frame f = {
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.frametype = AST_FRAME_VOICE,
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.samples = 160,
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.src = __PRETTY_FUNCTION__
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};
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return &f;
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}
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static int register_translator(int dst, int src, void *mod)
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{
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struct translator *zt;
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int res;
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if (!(zt = ast_calloc(1, sizeof(*zt))))
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return -1;
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snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s",
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ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
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zt->t.srcfmt = (1 << src);
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zt->t.dstfmt = (1 << dst);
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zt->t.newpvt = zap_new;
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zt->t.framein = zap_framein;
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zt->t.frameout = zap_frameout;
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zt->t.destroy = zap_destroy;
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zt->t.sample = fakesrc_sample;
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zt->t.useplc = global_useplc;
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zt->t.buf_size = BUFFER_SAMPLES * 2;
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zt->t.desc_size = sizeof(struct pvt);
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if ((res = ast_register_translator(&zt->t, mod))) {
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free(zt);
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return -1;
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}
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AST_LIST_LOCK(&translators);
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AST_LIST_INSERT_HEAD(&translators, zt, entry);
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AST_LIST_UNLOCK(&translators);
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global_format_map.map[dst][src] = 1;
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return res;
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}
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static void drop_translator(int dst, int src)
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{
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struct translator *cur;
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AST_LIST_LOCK(&translators);
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AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, cur, entry) {
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if (cur->t.srcfmt != src)
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continue;
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if (cur->t.dstfmt != dst)
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continue;
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AST_LIST_REMOVE_CURRENT(&translators, entry);
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ast_unregister_translator(&cur->t);
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free(cur);
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global_format_map.map[dst][src] = 0;
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break;
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}
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AST_LIST_TRAVERSE_SAFE_END;
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AST_LIST_UNLOCK(&translators);
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}
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static void unregister_translators(void)
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{
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struct translator *cur;
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AST_LIST_LOCK(&translators);
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while ((cur = AST_LIST_REMOVE_HEAD(&translators, entry))) {
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ast_unregister_translator(&cur->t);
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free(cur);
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}
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AST_LIST_UNLOCK(&translators);
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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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global_useplc = ast_true(var->value);
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if (option_verbose > 2)
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ast_verbose(VERBOSE_PREFIX_3 "codec_zap: %susing generic PLC\n",
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global_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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static void build_translators(void *mod, struct format_map *map, unsigned int dstfmts, unsigned int srcfmts)
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{
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unsigned int src, dst;
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for (src = 0; src < 32; src++) {
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for (dst = 0; dst < 32; dst++) {
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if (!(srcfmts & (1 << src)))
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continue;
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if (!(dstfmts & (1 << dst)))
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continue;
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if (global_format_map.map[dst][src])
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continue;
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if (!register_translator(dst, src, mod))
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map->map[dst][src] = 1;
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}
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}
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}
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static int find_transcoders(void *mod)
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{
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struct zt_transcode_info info = { 0, };
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struct format_map map = { { { 0 } } };
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int fd, res;
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unsigned int x, y;
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info.op = ZT_TCOP_GETINFO;
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if ((fd = open("/dev/zap/transcode", O_RDWR)) < 0) {
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ast_log(LOG_NOTICE, "No Zaptel transcoder support!\n");
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return 0;
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}
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for (info.tcnum = 0; !(res = ioctl(fd, ZT_TRANSCODE_OP, &info)); info.tcnum++) {
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if (option_verbose > 1)
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ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);
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build_translators(mod, &map, info.dstfmts, info.srcfmts);
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}
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close(fd);
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if (!info.tcnum && (option_verbose > 1))
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ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n");
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for (x = 0; x < 32; x++) {
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for (y = 0; y < 32; y++) {
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if (!map.map[x][y] && global_format_map.map[x][y])
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drop_translator(x, y);
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}
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}
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return 0;
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}
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static int reload(void *mod)
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{
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struct translator *cur;
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parse_config();
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find_transcoders(mod);
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AST_LIST_LOCK(&translators);
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AST_LIST_TRAVERSE(&translators, cur, entry)
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cur->t.useplc = global_useplc;
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AST_LIST_UNLOCK(&translators);
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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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unregister_translators();
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return 0;
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}
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static int load_module(void *mod)
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{
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parse_config();
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find_transcoders(mod);
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return 0;
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}
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static const char *description(void)
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{
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return "Generic Zaptel Transcoder Codec Translator";
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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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