Version 0.1.0 from FTP

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@82 65c4cc65-6c06-0410-ace0-fbb531ad65f3
26 years ago · 48216d276e
parent 7eb34ce906
commit 48216d276e
1 changed files with 490 additions and 0 deletions
--- a/file.c
+++ b/file.c
@ -0,0 +1,490 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Generic File Format Support.
+ * 
+ * Copyright (C) 1999, Adtran Inc. and Linux Support Services, LLC
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <asterisk/frame.h>
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/channel.h>
+#include <asterisk/sched.h>
+#include <asterisk/options.h>
+#include <asterisk/translate.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include "asterisk.h"
+
+struct ast_format {
+	/* Name of format */
+	char name[80];
+	/* Extensions (separated by | if more than one) 
+	   this format can read.  First is assumed for writing (e.g. .mp3) */
+	char exts[80];
+	/* Format of frames it uses/provides (one only) */
+	int format;
+	/* Open an input stream, and start playback */
+	struct ast_filestream * (*open)(int fd);
+	/* Open an output stream, of a given file descriptor and comment it appropriately if applicable */
+	struct ast_filestream * (*rewrite)(int fd, char *comment);
+	/* Apply a reading filestream to a channel */
+	int (*apply)(struct ast_channel *, struct ast_filestream *);
+	/* Write a frame to a channel */
+	int (*write)(struct ast_filestream *, struct ast_frame *);
+	/* Read the next frame from the filestream (if available) */
+	struct ast_frame * (*read)(struct ast_filestream *);
+	/* Close file, and destroy filestream structure */
+	void (*close)(struct ast_filestream *);
+	/* Retrieve file comment */
+	char * (*getcomment)(struct ast_filestream *);
+	/* Link */
+	struct ast_format *next;
+};
+
+struct ast_filestream {
+	/* Everybody reserves a block of AST_RESERVED_POINTERS pointers for us */
+	struct ast_format *fmt;
+	/* Transparently translate from another format -- just once */
+	struct ast_trans_pvt *trans;
+	struct ast_tranlator_pvt *tr;
+};
+
+static pthread_mutex_t formatlock = PTHREAD_MUTEX_INITIALIZER;
+
+static struct ast_format *formats = NULL;
+
+int ast_format_register(char *name, char *exts, int format,
+						struct ast_filestream * (*open)(int fd),
+						struct ast_filestream * (*rewrite)(int fd, char *comment),
+						int (*apply)(struct ast_channel *, struct ast_filestream *),
+						int (*write)(struct ast_filestream *, struct ast_frame *),
+						struct ast_frame * (*read)(struct ast_filestream *),
+						void (*close)(struct ast_filestream *),
+						char * (*getcomment)(struct ast_filestream *))
+{
+	struct ast_format *tmp;
+	if (pthread_mutex_lock(&formatlock)) {
+		ast_log(LOG_WARNING, "Unable to lock format list\n");
+		return -1;
+	}
+	tmp = formats;
+	while(tmp) {
+		if (!strcasecmp(name, tmp->name)) {
+			pthread_mutex_unlock(&formatlock);
+			ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", name);
+			return -1;
+		}
+		tmp = tmp->next;
+	}
+	tmp = malloc(sizeof(struct ast_format));
+	if (!tmp) {
+		ast_log(LOG_WARNING, "Out of memory\n");
+		pthread_mutex_unlock(&formatlock);
+		return -1;
+	}
+	strncpy(tmp->name, name, sizeof(tmp->name));
+	strncpy(tmp->exts, exts, sizeof(tmp->exts));
+	tmp->open = open;
+	tmp->rewrite = rewrite;
+	tmp->apply = apply;
+	tmp->read = read;
+	tmp->write = write;
+	tmp->close = close;
+	tmp->format = format;
+	tmp->getcomment = getcomment;
+	tmp->next = formats;
+	formats = tmp;
+	pthread_mutex_unlock(&formatlock);
+	if (option_verbose > 1)
+		ast_verbose( VERBOSE_PREFIX_2 "Registered file format %s, extension(s) %s\n", name, exts);
+	return 0;
+}
+
+int ast_format_unregister(char *name)
+{
+	struct ast_format *tmp, *tmpl = NULL;
+	if (pthread_mutex_lock(&formatlock)) {
+		ast_log(LOG_WARNING, "Unable to lock format list\n");
+		return -1;
+	}
+	tmp = formats;
+	while(tmp) {
+		if (!strcasecmp(name, tmp->name)) {
+			if (tmpl) 
+				tmpl->next = tmp->next;
+			else
+				formats = tmp->next;
+			free(tmp);
+			pthread_mutex_unlock(&formatlock);
+			if (option_verbose > 1)
+				ast_verbose( VERBOSE_PREFIX_2 "Unregistered format %s\n", name);
+			return 0;
+		}
+		tmp = tmp->next;
+	}
+	ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
+	return -1;
+}
+
+int ast_stopstream(struct ast_channel *tmp)
+{
+	if (tmp->trans)
+		tmp = tmp->trans;
+	/* Stop a running stream if there is one */
+	if (!tmp->stream) 
+		return 0;
+	tmp->stream->fmt->close(tmp->stream);
+	if (tmp->master) {
+		ast_translator_destroy(tmp);
+	}
+	return 0;
+}
+
+int ast_closestream(struct ast_filestream *f)
+{
+	if (f->trans) {
+		ast_translator_free_path(f->trans);
+	}
+	/* Stop a running stream if there is one */
+	f->fmt->close(f);
+	return 0;
+}
+
+int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
+{
+	struct ast_frame_chain *fc, *f2;
+	int res = -1;
+	int count=0;
+	if (f->frametype != AST_FRAME_VOICE) {
+		ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
+		return -1;
+	}
+	if ((fs->fmt->format & f->subclass) == f->subclass)
+		return fs->fmt->write(fs, f);
+	else {
+		/* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
+		       the one we've setup a translator for, we do the "wrong thing" XXX */
+		if (!fs->trans) 
+			fs->trans = ast_translator_build_path(f->subclass, fs->fmt->format);
+		if (!fs->trans)
+			ast_log(LOG_WARNING, "Unable to translate to format %s, source format %d\n", fs->fmt->name, f->subclass);
+		else {
+			/* Build a chain of translated frames */
+			fc = ast_translate(fs->trans, f);
+			f2 = fc;
+			while(f2) {
+				res = fs->fmt->write(fs, f2->fr);
+				if (res) {
+					ast_log(LOG_WARNING, "Frame write failed\n");
+					break;
+				}
+				f2 = f2->next;
+				count++;
+				if (count > 1) 
+					ast_log(LOG_DEBUG, "Count is %d\n", count);
+			}
+			if (fc)
+				ast_frchain(fc);
+		}
+		return res;
+	}
+}
+
+static char *build_filename(char *filename, char *ext)
+{
+	char *fn;
+	fn = malloc(strlen(AST_SOUNDS) + strlen(filename) + strlen(ext) + 10);
+	if (fn) {
+		if (filename[0] == '/') 
+			sprintf(fn, "%s.%s", filename, ext);
+		else
+			sprintf(fn, "%s/%s.%s", AST_SOUNDS, filename, ext);
+	}
+	return fn;
+	
+}
+
+#define ACTION_EXISTS 1
+#define ACTION_DELETE 2
+#define ACTION_RENAME 3
+#define ACTION_OPEN   4
+
+static int ast_filehelper(char *filename, char *filename2, char *fmt, int action)
+{
+	struct stat st;
+	struct ast_format *f;
+	struct ast_filestream *s;
+	int res=0, ret = 0;
+	char *ext=NULL, *exts, *fn, *nfn;
+	struct ast_channel *trans = (struct ast_channel *)filename2;
+	
+	/* Start with negative response */
+	if (action == ACTION_EXISTS)
+		res = 0;
+	else
+		res = -1;
+	if (action == ACTION_OPEN)
+		ret = -1;
+	/* Check for a specific format */
+	if (pthread_mutex_lock(&formatlock)) {
+		ast_log(LOG_WARNING, "Unable to lock format list\n");
+		if (action == ACTION_EXISTS)
+			return 0;
+		else
+			return -1;
+	}
+	f = formats;
+	while(f) {
+		if (!fmt || !strcasecmp(f->name, fmt)) {
+			exts = strdup(f->exts);
+			/* Try each kind of extension */
+			ext = strtok(exts, "|");
+			do {
+				fn = build_filename(filename, ext);
+				if (fn) {
+					res = stat(fn, &st);
+					if (!res) {
+						switch(action) {
+						case ACTION_EXISTS:
+							ret |= f->format;
+							break;
+						case ACTION_DELETE:
+							res = unlink(fn);
+							if (res)
+								ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
+							break;
+						case ACTION_RENAME:
+							nfn = build_filename(filename2, ext);
+							if (nfn) {
+								res = rename(fn, nfn);
+								if (res)
+									ast_log(LOG_WARNING, "rename(%s,%s) failed: %s\n", fn, nfn, strerror(errno));
+								free(nfn);
+							} else
+								ast_log(LOG_WARNING, "Out of memory\n");
+							break;
+						case ACTION_OPEN:
+							if ((ret < 0) && ((trans->format & f->format) /* == trans->format */)) {
+								ret = open(fn, O_RDONLY);
+								if (ret >= 0) {
+									s = f->open(ret);
+									if (s) {
+										s->fmt = f;
+										s->trans = NULL;
+										trans->stream = s;
+										if (f->apply(trans, s)) {
+											f->close(s);
+											trans->stream = NULL;
+											ast_log(LOG_WARNING, "Unable to apply stream to channel %s\n", trans->name);
+											close(ret);
+											ret = 0;
+										}
+									} else {
+										close(ret);
+										ast_log(LOG_WARNING, "Unable to open fd on %s\n", filename);
+									}
+								} else
+									ast_log(LOG_WARNING, "Couldn't open file %s\n", fn);
+							}
+							break;
+						default:
+							ast_log(LOG_WARNING, "Unknown helper %d\n", action);
+						}
+						/* Conveniently this logic is the same for all */
+						if (res)
+							break;
+					}
+					free(fn);
+				}
+				ext = strtok(NULL, "|");
+			} while(ext);
+			free(exts);
+		}
+		f = f->next;
+	}
+	pthread_mutex_unlock(&formatlock);
+	if ((action == ACTION_EXISTS) || (action == ACTION_OPEN))
+		res = ret ? ret : -1;
+	return res;
+}
+
+int ast_fileexists(char *filename, char *fmt)
+{
+	return ast_filehelper(filename, NULL, fmt, ACTION_EXISTS);
+}
+
+int ast_filedelete(char *filename, char *fmt)
+{
+	return ast_filehelper(filename, NULL, fmt, ACTION_DELETE);
+}
+
+int ast_filerename(char *filename, char *filename2, char *fmt)
+{
+	return ast_filehelper(filename, filename2, fmt, ACTION_RENAME);
+}
+
+int ast_streamfile(struct ast_channel *chan, char *filename)
+{
+	/* This is a fairly complex routine.  Essentially we should do 
+	   the following:
+	   
+	   1) Find which file handlers produce our type of format.
+	   2) Look for a filename which it can handle.
+	   3) If we find one, then great.  
+	   *4) If not, see what files are there
+	   *5) See what we can actually support
+	   *6) Choose the one with the least costly translator path and
+	       set it up.
+		   
+		XXX * = unimplemented XXX
+	*/
+	int fd = -1;
+	struct ast_channel *trans;
+	int fmts;
+	ast_stopstream(chan);
+	fmts = ast_fileexists(filename, NULL);
+	if (fmts < 1) {
+		ast_log(LOG_WARNING, "File %s does not exist in any format\n", filename);
+		return -1;
+	}
+	if (fmts & chan->format) {
+		/* No translation necessary -- we have a file in a format our channel can 
+		   handle */
+		trans = chan;
+	} else {
+		/* Find the best */
+		fmts = ast_translator_best_choice(chan->format, fmts);
+		if (fmts < 1) {
+			ast_log(LOG_WARNING, "Unable to find a translator method\n");
+			return -1;
+		}
+		trans = ast_translator_create(chan, fmts, AST_DIRECTION_OUT);
+		if (!trans) {
+			ast_log(LOG_WARNING, "Unable to create translator\n");
+			return -1;
+		}
+	}
+ 	fd = ast_filehelper(filename, (char *)trans, NULL, ACTION_OPEN);
+	if (fd >= 0) {
+#if 0
+		ast_verbose(VERBOSE_PREFIX_3 "Playing '%s'\n", filename);
+#endif
+		return 0;
+	}
+	ast_log(LOG_WARNING, "Unable to open %s (format %d): %s\n", filename, chan->format, strerror(errno));
+	if (chan != trans)
+		ast_translator_destroy(trans);	
+	return -1;
+}
+
+
+struct ast_filestream *ast_writefile(char *filename, char *type, char *comment, int flags, int check, mode_t mode)
+{
+	int fd;
+	struct ast_format *f;
+	struct ast_filestream *fs=NULL;
+	char *fn;
+	char *ext;
+	if (pthread_mutex_lock(&formatlock)) {
+		ast_log(LOG_WARNING, "Unable to lock format list\n");
+		return NULL;
+	}
+	f = formats;
+	while(f) {
+		if (!strcasecmp(f->name, type)) {
+			/* XXX Implement check XXX */
+			ext = strdup(f->exts);
+			ext = strtok(ext, "|");
+			fn = build_filename(filename, ext);
+			fd = open(fn, flags | O_WRONLY | O_CREAT, mode);
+			if (fd >= 0) {
+				errno = 0;
+				if ((fs = f->rewrite(fd, comment))) {
+					fs->trans = NULL;
+					fs->fmt = f;
+				} else {
+					ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
+					close(fd);
+					unlink(fn);
+				}
+			} else if (errno != EEXIST)
+				ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));
+			free(fn);
+			free(ext);
+			break;
+		}
+		f = f->next;
+	}
+	pthread_mutex_unlock(&formatlock);
+	if (!f) 
+		ast_log(LOG_WARNING, "No such format '%s'\n", type);
+	return fs;
+}
+
+char ast_waitstream(struct ast_channel *c, char *breakon)
+{
+	int res;
+	struct ast_frame *fr;
+	if (c->trans)
+		c=c->trans;
+	while(c->stream) {
+		res = ast_sched_wait(c->sched);
+		if (res < 0) {
+			/* Okay, stop :) */
+			return 0;
+		}
+		res = ast_waitfor(c, res);
+		if (res < 0) {
+			ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
+			return res;
+		} else
+		if (res > 0) {
+			fr = ast_read(c);
+			if (!fr) {
+#if 0
+				ast_log(LOG_DEBUG, "Got hung up\n");
+#endif
+				return -1;
+			}
+			
+			switch(fr->frametype) {
+			case AST_FRAME_DTMF:
+				res = fr->subclass;
+				ast_frfree(fr);
+				if (strchr(breakon, res))
+					return res;
+				break;
+			case AST_FRAME_CONTROL:
+				switch(fr->subclass) {
+				case AST_CONTROL_HANGUP:
+					ast_frfree(fr);
+					return -1;
+				default:
+					ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass);
+				}
+			default:
+				/* Ignore */
+				ast_frfree(fr);
+			}
+		} else
+			ast_sched_runq(c->sched);
+	
+		
+	}
+	return 0;
+}
+