![markster](/assets/img/avatar_default.png)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@252 f38db490-d61c-443f-a65b-d21fe96a405b
369 lines
9.7 KiB
C
Executable file
369 lines
9.7 KiB
C
Executable file
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Translate via the use of pseudo channels
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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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
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*/
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#include <asterisk/channel.h>
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#include <asterisk/channel_pvt.h>
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#include <asterisk/logger.h>
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#include <asterisk/translate.h>
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#include <asterisk/options.h>
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#include <asterisk/frame.h>
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#include <asterisk/sched.h>
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#include <asterisk/cli.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <string.h>
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#include <stdio.h>
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/* Uncomment the EXPERIMENTAL_TRANSLATION to enable a more complicated, but probably more
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correct way of handling full duplex translation */
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/*
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#define EXPERIMENTAL_TRANSLATION
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*/
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/* This could all be done more efficiently *IF* we chained packets together
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by default, but it would also complicate virtually every application. */
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static pthread_mutex_t list_lock = PTHREAD_MUTEX_INITIALIZER;
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static struct ast_translator *list = NULL;
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struct ast_translator_dir {
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struct ast_translator *step; /* Next step translator */
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int cost; /* Complete cost to destination */
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};
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struct ast_frame_delivery {
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struct ast_frame *f;
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struct ast_channel *chan;
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int fd;
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struct translator_pvt *owner;
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struct ast_frame_delivery *prev;
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struct ast_frame_delivery *next;
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};
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static struct ast_translator_dir tr_matrix[MAX_FORMAT][MAX_FORMAT];
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struct ast_trans_pvt {
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struct ast_translator *step;
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struct ast_translator_pvt *state;
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struct ast_trans_pvt *next;
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};
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static int powerof(int d)
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{
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int x;
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for (x = 0; x < 32; x++)
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if ((1 << x) & d)
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return x;
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ast_log(LOG_WARNING, "Powerof %d: No power??\n", d);
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return -1;
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}
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void ast_translator_free_path(struct ast_trans_pvt *p)
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{
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struct ast_trans_pvt *pl;
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while(p) {
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pl = p;
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p = p->next;
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if (pl->state && pl->step->destroy)
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pl->step->destroy(pl->state);
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free(pl);
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}
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}
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struct ast_trans_pvt *ast_translator_build_path(int dest, int source)
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{
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struct ast_trans_pvt *tmpr = NULL, *tmp = NULL;
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/* One of the hardest parts: Build a set of translators based upon
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the given source and destination formats */
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source = powerof(source);
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dest = powerof(dest);
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while(source != dest) {
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if (tr_matrix[source][dest].step) {
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if (tmp) {
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tmp->next = malloc(sizeof(struct ast_trans_pvt));
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tmp = tmp->next;
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} else
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tmp = malloc(sizeof(struct ast_trans_pvt));
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if (tmp) {
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tmp->next = NULL;
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tmp->step = tr_matrix[source][dest].step;
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tmp->state = tmp->step->new();
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if (!tmp->state) {
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free(tmp);
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tmp = NULL;
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}
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/* Set the root, if it doesn't exist yet... */
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if (!tmpr)
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tmpr = tmp;
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/* Keep going if this isn't the final destination */
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source = tmp->step->dstfmt;
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} else {
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/* XXX This could leak XXX */
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ast_log(LOG_WARNING, "Out of memory\n");
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return NULL;
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}
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} else {
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/* We shouldn't have allocated any memory */
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ast_log(LOG_WARNING, "No translator path from %d to %d\n", source, dest);
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return NULL;
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}
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}
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return tmpr;
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}
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struct ast_frame *ast_translate(struct ast_trans_pvt *path, struct ast_frame *f, int consume)
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{
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struct ast_trans_pvt *p;
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struct ast_frame *out;
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p = path;
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/* Feed the first frame into the first translator */
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p->step->framein(p->state, f);
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if (consume)
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ast_frfree(f);
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while(p) {
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out = p->step->frameout(p->state);
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/* If we get nothing out, return NULL */
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if (!out)
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return NULL;
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/* If there is a next state, feed it in there. If not,
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return this frame */
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if (p->next)
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p->next->step->framein(p->next->state, out);
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else
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return out;
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p = p->next;
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}
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ast_log(LOG_WARNING, "I should never get here...\n");
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return NULL;
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}
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static void rebuild_matrix()
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{
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struct ast_translator *t;
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int changed;
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int x,y,z;
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if (option_debug)
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ast_log(LOG_DEBUG, "Reseting translation matrix\n");
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/* Use the list of translators to build a translation matrix */
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bzero(tr_matrix, sizeof(tr_matrix));
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t = list;
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while(t) {
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if (!tr_matrix[t->srcfmt][t->dstfmt].step ||
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tr_matrix[t->srcfmt][t->dstfmt].cost > t->cost) {
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tr_matrix[t->srcfmt][t->dstfmt].step = t;
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tr_matrix[t->srcfmt][t->dstfmt].cost = t->cost;
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}
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t = t->next;
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}
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do {
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changed = 0;
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/* Don't you just love O(N^3) operations? */
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for (x=0; x< MAX_FORMAT; x++) /* For each source format */
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for (y=0; y < MAX_FORMAT; y++) /* And each destination format */
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if (x != y) /* Except ourselves, of course */
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for (z=0; z < MAX_FORMAT; z++) /* And each format it might convert to */
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if ((x!=z) && (y!=z)) /* Don't ever convert back to us */
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if (tr_matrix[x][y].step && /* We can convert from x to y */
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tr_matrix[y][z].step && /* And from y to z and... */
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(!tr_matrix[x][z].step || /* Either there isn't an x->z conversion */
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(tr_matrix[x][y].cost +
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tr_matrix[y][z].cost < /* Or we're cheaper than the existing */
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tr_matrix[x][z].cost) /* solution */
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)) {
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/* We can get from x to z via y with a cost that
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is the sum of the transition from x to y and
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from y to z */
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tr_matrix[x][z].step = tr_matrix[x][y].step;
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tr_matrix[x][z].cost = tr_matrix[x][y].cost +
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tr_matrix[y][z].cost;
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if (option_debug)
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ast_log(LOG_DEBUG, "Discovered %d cost path from %d to %d, via %d\n", tr_matrix[x][z].cost, x, z, y);
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changed++;
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}
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} while (changed);
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}
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static void calc_cost(struct ast_translator *t)
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{
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int sofar=0;
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struct ast_translator_pvt *pvt;
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struct ast_frame *f, *out;
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struct timeval start, finish;
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int cost;
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/* If they don't make samples, give them a terrible score */
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if (!t->sample) {
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ast_log(LOG_WARNING, "Translator '%s' does not produce sample frames.\n", t->name);
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t->cost = 99999;
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return;
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}
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pvt = t->new();
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if (!pvt) {
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ast_log(LOG_WARNING, "Translator '%s' appears to be broken and will probably fail.\n", t->name);
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t->cost = 99999;
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return;
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}
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gettimeofday(&start, NULL);
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/* Call the encoder until we've processed one second of time */
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while(sofar < 1000) {
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f = t->sample();
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if (!f) {
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ast_log(LOG_WARNING, "Translator '%s' failed to produce a sample frame.\n", t->name);
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t->destroy(pvt);
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t->cost = 99999;
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return;
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}
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t->framein(pvt, f);
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ast_frfree(f);
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while((out = t->frameout(pvt))) {
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sofar += out->timelen;
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ast_frfree(out);
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}
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}
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gettimeofday(&finish, NULL);
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t->destroy(pvt);
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cost = (finish.tv_sec - start.tv_sec) * 1000 + (finish.tv_usec - start.tv_usec) / 1000;
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t->cost = cost;
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}
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static int show_translation(int fd, int argc, char *argv[])
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{
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#define SHOW_TRANS 14
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int x,y;
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char line[80];
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if (argc != 2)
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return RESULT_SHOWUSAGE;
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ast_cli(fd, " Translation times between formats (in milliseconds)\n");
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ast_cli(fd, " Destination Format\n");
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pthread_mutex_lock(&list_lock);
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for (x=0;x<SHOW_TRANS; x++) {
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if (x == 1)
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strcpy(line, " Src ");
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else if (x == 2)
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strcpy(line, " Fmt ");
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else
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strcpy(line, " ");
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for (y=0;y<SHOW_TRANS;y++) {
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if (tr_matrix[x][y].step)
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snprintf(line + strlen(line), sizeof(line) - strlen(line), " %4d", tr_matrix[x][y].cost);
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else
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snprintf(line + strlen(line), sizeof(line) - strlen(line), " n/a");
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}
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snprintf(line + strlen(line), sizeof(line) - strlen(line), "\n");
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ast_cli(fd, line);
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}
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pthread_mutex_unlock(&list_lock);
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return RESULT_SUCCESS;
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}
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static int added_cli = 0;
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static char show_trans_usage[] =
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"Usage: show translation\n"
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" Displays known codec translators and the cost associated\n"
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"with each conversion.\n";
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static struct ast_cli_entry show_trans =
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{ { "show", "translation", NULL }, show_translation, "Display translation matrix", show_trans_usage };
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int ast_register_translator(struct ast_translator *t)
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{
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t->srcfmt = powerof(t->srcfmt);
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t->dstfmt = powerof(t->dstfmt);
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if ((t->srcfmt >= MAX_FORMAT) || (t->dstfmt >= MAX_FORMAT)) {
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ast_log(LOG_WARNING, "Format %d is larger than MAX_FORMAT\n", t->srcfmt);
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return -1;
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}
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calc_cost(t);
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if (option_verbose > 1)
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ast_verbose(VERBOSE_PREFIX_2 "Registered translator '%s' from format %d to %d, cost %d\n", t->name, t->srcfmt, t->dstfmt, t->cost);
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pthread_mutex_lock(&list_lock);
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if (!added_cli) {
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ast_cli_register(&show_trans);
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added_cli++;
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}
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t->next = list;
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list = t;
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rebuild_matrix();
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pthread_mutex_unlock(&list_lock);
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return 0;
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}
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int ast_unregister_translator(struct ast_translator *t)
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{
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struct ast_translator *u, *ul = NULL;
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pthread_mutex_lock(&list_lock);
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u = list;
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while(u) {
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if (u == t) {
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if (ul)
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ul->next = u->next;
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else
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list = u->next;
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break;
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}
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ul = u;
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u = u->next;
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}
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rebuild_matrix();
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pthread_mutex_unlock(&list_lock);
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return (u ? 0 : -1);
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}
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int ast_translator_best_choice(int *dst, int *srcs)
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{
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/* Calculate our best source format, given costs, and a desired destination */
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int x,y;
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int best=-1;
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int bestdst=0;
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int cur = 1;
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int besttime=999999999;
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pthread_mutex_lock(&list_lock);
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for (y=0;y<MAX_FORMAT;y++) {
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if ((cur & *dst) && (cur & *srcs)) {
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/* This is a common format to both. Pick it if we don't have one already */
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besttime=0;
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bestdst = cur;
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best = cur;
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break;
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}
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if (cur & *dst)
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for (x=0;x<MAX_FORMAT;x++) {
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if (tr_matrix[x][y].step && /* There's a step */
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(tr_matrix[x][y].cost < besttime) && /* We're better than what exists now */
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(*srcs & (1 << x))) /* x is a valid source format */
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{
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best = 1 << x;
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bestdst = cur;
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besttime = tr_matrix[x][y].cost;
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}
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}
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cur = cur << 1;
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}
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if (best > -1) {
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*srcs = best;
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*dst = bestdst;
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best = 0;
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}
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pthread_mutex_unlock(&list_lock);
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return best;
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}
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