460 lines
10 KiB
C
460 lines
10 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* DAHDI native transcoding support
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*
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* Copyright (C) 1999 - 2008, 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 DAHDI 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>dahdi</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 <netinet/in.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <dahdi/user.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/module.h"
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#include "asterisk/cli.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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static struct channel_usage {
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int total;
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int encoders;
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int decoders;
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} channels;
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static char *handle_cli_transcoder_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
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static struct ast_cli_entry cli[] = {
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AST_CLI_DEFINE(handle_cli_transcoder_show, "Display DAHDI transcoder utilization.")
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};
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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 dahdi_transcoder_formats fmts;
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int samples;
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};
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static char *handle_cli_transcoder_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
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{
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struct channel_usage copy;
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switch (cmd) {
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case CLI_INIT:
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e->command = "transcoder show";
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e->usage =
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"Usage: transcoder show\n"
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" Displays channel utilization of DAHDI transcoder(s).\n";
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return NULL;
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case CLI_GENERATE:
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return NULL;
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}
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if (a->argc != 2)
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return CLI_SHOWUSAGE;
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copy = channels;
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if (copy.total == 0)
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ast_cli(a->fd, "No DAHDI transcoders found.\n");
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else
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ast_cli(a->fd, "%d/%d encoders/decoders of %d channels are in use.\n", copy.encoders, copy.decoders, copy.total);
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return CLI_SUCCESS;
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}
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static int dahdi_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
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{
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int res;
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struct pvt *dahdip = pvt->pvt;
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if (f->subclass) {
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/* Give the frame to the hardware transcoder... */
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res = write(dahdip->fd, f->data.ptr, f->datalen);
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if (-1 == res) {
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ast_log(LOG_ERROR, "Failed to write to /dev/dahdi/transcode: %s\n", strerror(errno));
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}
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if (f->datalen != res) {
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ast_log(LOG_ERROR, "Requested write of %d bytes, but only wrote %d bytes.\n", f->datalen, res);
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}
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res = -1;
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pvt->samples += f->samples;
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} else {
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/* Fake a return frame for calculation purposes */
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dahdip->fake = 2;
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pvt->samples = f->samples;
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res = 0;
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}
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return res;
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}
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static struct ast_frame *dahdi_frameout(struct ast_trans_pvt *pvt)
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{
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struct pvt *dahdip = pvt->pvt;
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if (0 == dahdip->fake) {
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int res;
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/* Let's check to see if there is a new frame for us.... */
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res = read(dahdip->fd, pvt->outbuf.uc + pvt->datalen, pvt->t->buf_size - pvt->datalen);
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if (-1 == res) {
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if (EWOULDBLOCK == errno) {
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/* Nothing waiting... */
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return NULL;
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} else {
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ast_log(LOG_ERROR, "Failed to read from /dev/dahdi/transcode: %s\n", strerror(errno));
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return NULL;
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}
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} else {
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pvt->f.samples = dahdip->samples;
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pvt->f.datalen = res;
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pvt->datalen = 0;
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pvt->f.frametype = AST_FRAME_VOICE;
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pvt->f.subclass = 1 << (pvt->t->dstfmt);
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pvt->f.mallocd = 0;
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pvt->f.offset = AST_FRIENDLY_OFFSET;
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pvt->f.src = pvt->t->name;
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pvt->f.data.ptr = pvt->outbuf.uc;
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ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
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return &pvt->f;
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}
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} else if (2 == dahdip->fake) {
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dahdip->fake = 1;
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pvt->f.frametype = AST_FRAME_VOICE;
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pvt->f.subclass = 0;
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pvt->f.samples = 160;
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pvt->f.data.ptr = NULL;
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pvt->f.offset = 0;
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pvt->f.datalen = 0;
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pvt->f.mallocd = 0;
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ast_set_flag(&pvt->f, AST_FRFLAG_FROM_TRANSLATOR);
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pvt->samples = 0;
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return &pvt->f;
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} else if (1 == dahdip->fake) {
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return NULL;
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}
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/* Shouldn't get here... */
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return NULL;
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}
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static void dahdi_destroy(struct ast_trans_pvt *pvt)
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{
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struct pvt *dahdip = pvt->pvt;
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switch (dahdip->fmts.dstfmt) {
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case AST_FORMAT_G729A:
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case AST_FORMAT_G723_1:
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ast_atomic_fetchadd_int(&channels.encoders, -1);
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break;
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default:
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ast_atomic_fetchadd_int(&channels.decoders, -1);
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break;
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}
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close(dahdip->fd);
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}
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static int dahdi_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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struct pvt *dahdip = pvt->pvt;
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int flags;
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if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
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ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
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return -1;
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}
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dahdip->fmts.srcfmt = (1 << source);
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dahdip->fmts.dstfmt = (1 << dest);
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ast_log(LOG_VERBOSE, "Opening transcoder channel from %d to %d.\n", source, dest);
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if (ioctl(fd, DAHDI_TC_ALLOCATE, &dahdip->fmts)) {
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ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
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close(fd);
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return -1;
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}
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flags = fcntl(fd, F_GETFL);
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if (flags > - 1) {
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if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
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ast_log(LOG_WARNING, "Could not set non-block mode!\n");
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}
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dahdip->fd = fd;
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switch (dahdip->fmts.dstfmt) {
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case AST_FORMAT_G729A:
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dahdip->samples = 160;
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break;
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case AST_FORMAT_G723_1:
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dahdip->samples = 240;
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ast_atomic_fetchadd_int(&channels.encoders, +1);
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break;
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default:
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dahdip->samples = 160;
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ast_atomic_fetchadd_int(&channels.decoders, +1);
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break;
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}
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return 0;
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}
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static int dahdi_new(struct ast_trans_pvt *pvt)
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{
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return dahdi_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)
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{
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struct translator *dahdi;
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int res;
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if (!(dahdi = ast_calloc(1, sizeof(*dahdi))))
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return -1;
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snprintf((char *) (dahdi->t.name), sizeof(dahdi->t.name), "dahdi%sto%s",
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ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
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dahdi->t.srcfmt = (1 << src);
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dahdi->t.dstfmt = (1 << dst);
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dahdi->t.newpvt = dahdi_new;
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dahdi->t.framein = dahdi_framein;
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dahdi->t.frameout = dahdi_frameout;
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dahdi->t.destroy = dahdi_destroy;
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dahdi->t.sample = fakesrc_sample;
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dahdi->t.useplc = global_useplc;
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dahdi->t.buf_size = BUFFER_SAMPLES * 2;
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dahdi->t.desc_size = sizeof(struct pvt);
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if ((res = ast_register_translator(&dahdi->t))) {
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ast_free(dahdi);
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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, dahdi, 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(entry);
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ast_unregister_translator(&cur->t);
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ast_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 *current;
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AST_LIST_LOCK(&translators);
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while ((current = AST_LIST_REMOVE_HEAD(&translators, entry))) {
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ast_unregister_translator(¤t->t);
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ast_free(current);
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}
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AST_LIST_UNLOCK(&translators);
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}
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static int parse_config(int reload)
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{
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struct ast_variable *var;
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struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
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struct ast_config *cfg = ast_config_load("codecs.conf", config_flags);
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if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID)
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return 0;
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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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ast_verb(3, "codec_dahdi: %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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return 0;
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}
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static void build_translators(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))
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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)
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{
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struct dahdi_transcoder_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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if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
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ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
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return 0;
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}
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for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TC_GETINFO, &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(&map, info.dstfmts, info.srcfmts);
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ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);
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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)
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{
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struct translator *cur;
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if (parse_config(1))
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return AST_MODULE_LOAD_DECLINE;
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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 AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_cli_unregister_multiple(cli, ARRAY_LEN(cli));
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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)
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{
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if (parse_config(0))
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return AST_MODULE_LOAD_DECLINE;
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find_transcoders();
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ast_cli_register_multiple(cli, ARRAY_LEN(cli));
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Generic DAHDI Transcoder Codec Translator",
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.load = load_module,
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.unload = unload_module,
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.reload = reload,
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);
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