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  •  * Asterisk -- An open source telephony toolkit.
    
     *
     * Brian K. West <brian@bkw.org>
     * 
    
     * Copyright (C) 1999 - 2005, Digium, Inc.
    
     * Mark Spencer <markster@digium.com>
    
     * See http://www.asterisk.org for more information about
     * the Asterisk project. Please do not directly contact
     * any of the maintainers of this project for assistance;
     * the project provides a web site, mailing lists and IRC
     * channels for your use.
     *
    
     * This program is free software, distributed under the terms of
    
     * the GNU General Public License Version 2. See the LICENSE file
     * at the top of the source tree.
     */
    
    
     * \brief Save to raw, headerless iLBC data.
    
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     * \arg File name extension: ilbc
     * \ingroup formats
    
    #include <netinet/in.h>
    #include <arpa/inet.h>
    #include <stdlib.h>
    #include <sys/time.h>
    #include <stdio.h>
    #include <errno.h>
    #include <string.h>
    
    
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    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    #include "asterisk/lock.h"
    #include "asterisk/channel.h"
    #include "asterisk/file.h"
    #include "asterisk/logger.h"
    #include "asterisk/sched.h"
    #include "asterisk/module.h"
    #include "asterisk/endian.h"
    
    
    /* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */
    
    /* Portions of the conversion code are by guido@sienanet.it */
    
    struct ast_filestream {
    	void *reserved[AST_RESERVED_POINTERS];
    	/* Believe it or not, we must decode/recode to account for the
    	   weird MS format */
    	/* This is what a filestream means to us */
    
    	FILE *f; /* Descriptor */
    
    	struct ast_frame fr;				/* Frame information */
    	char waste[AST_FRIENDLY_OFFSET];	/* Buffer for sending frames, etc */
    	char empty;							/* Empty character */
    
    	unsigned char ilbc[50];				/* One Real iLBC Frame */
    
    AST_MUTEX_DEFINE_STATIC(ilbc_lock);
    
    static int glistcnt = 0;
    
    static char *name = "iLBC";
    static char *desc = "Raw iLBC data";
    static char *exts = "ilbc";
    
    
    static struct ast_filestream *ilbc_open(FILE *f)
    
    {
    	/* We don't have any header to read or anything really, but
    	   if we did, it would go here.  We also might want to check
    	   and be sure it's a valid file.  */
    	struct ast_filestream *tmp;
    	if ((tmp = malloc(sizeof(struct ast_filestream)))) {
    		memset(tmp, 0, sizeof(struct ast_filestream));
    		if (ast_mutex_lock(&ilbc_lock)) {
    			ast_log(LOG_WARNING, "Unable to lock ilbc list\n");
    			free(tmp);
    			return NULL;
    		}
    
    		tmp->fr.data = tmp->ilbc;
    		tmp->fr.frametype = AST_FRAME_VOICE;
    		tmp->fr.subclass = AST_FORMAT_ILBC;
    		/* datalen will vary for each frame */
    		tmp->fr.src = name;
    		tmp->fr.mallocd = 0;
    		glistcnt++;
    		ast_mutex_unlock(&ilbc_lock);
    		ast_update_use_count();
    	}
    	return tmp;
    }
    
    
    static struct ast_filestream *ilbc_rewrite(FILE *f, const char *comment)
    
    {
    	/* We don't have any header to read or anything really, but
    	   if we did, it would go here.  We also might want to check
    	   and be sure it's a valid file.  */
    	struct ast_filestream *tmp;
    	if ((tmp = malloc(sizeof(struct ast_filestream)))) {
    		memset(tmp, 0, sizeof(struct ast_filestream));
    		if (ast_mutex_lock(&ilbc_lock)) {
    			ast_log(LOG_WARNING, "Unable to lock ilbc list\n");
    			free(tmp);
    			return NULL;
    		}
    
    		glistcnt++;
    		ast_mutex_unlock(&ilbc_lock);
    		ast_update_use_count();
    	} else
    		ast_log(LOG_WARNING, "Out of memory\n");
    	return tmp;
    }
    
    static void ilbc_close(struct ast_filestream *s)
    {
    	if (ast_mutex_lock(&ilbc_lock)) {
    		ast_log(LOG_WARNING, "Unable to lock ilbc list\n");
    		return;
    	}
    	glistcnt--;
    	ast_mutex_unlock(&ilbc_lock);
    	ast_update_use_count();
    
    	free(s);
    	s = NULL;
    }
    
    static struct ast_frame *ilbc_read(struct ast_filestream *s, int *whennext)
    {
    	int res;
    	/* Send a frame from the file to the appropriate channel */
    	s->fr.frametype = AST_FRAME_VOICE;
    	s->fr.subclass = AST_FORMAT_ILBC;
    	s->fr.offset = AST_FRIENDLY_OFFSET;
    	s->fr.samples = 240;
    	s->fr.datalen = 50;
    	s->fr.mallocd = 0;
    	s->fr.data = s->ilbc;
    
    	if ((res = fread(s->ilbc, 1, 50, s->f)) != 50) {
    
    		if (res)
    			ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
    		return NULL;
    	}
    	*whennext = s->fr.samples;
    	return &s->fr;
    }
    
    static int ilbc_write(struct ast_filestream *fs, struct ast_frame *f)
    {
    	int res;
    	if (f->frametype != AST_FRAME_VOICE) {
    		ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
    		return -1;
    	}
    	if (f->subclass != AST_FORMAT_ILBC) {
    		ast_log(LOG_WARNING, "Asked to write non-iLBC frame (%d)!\n", f->subclass);
    		return -1;
    	}
    	if (f->datalen % 50) {
    		ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
    		return -1;
    	}
    
    	if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
    
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    			ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
    
    			return -1;
    	}
    	return 0;
    }
    
    static char *ilbc_getcomment(struct ast_filestream *s)
    {
    	return NULL;
    }
    
    static int ilbc_seek(struct ast_filestream *fs, long sample_offset, int whence)
    {
    	long bytes;
    	off_t min,cur,max,offset=0;
    	min = 0;
    
    	cur = ftell(fs->f);
    	fseek(fs->f, 0, SEEK_END);
    	max = ftell(fs->f);
    
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    	bytes = 50 * (sample_offset / 240);
    
    	if (whence == SEEK_SET)
    		offset = bytes;
    	else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
    		offset = cur + bytes;
    	else if (whence == SEEK_END)
    		offset = max - bytes;
    	if (whence != SEEK_FORCECUR) {
    		offset = (offset > max)?max:offset;
    	}
    
    	/* protect against seeking beyond begining. */
    
    	offset = (offset < min)?min:offset;
    
    	if (fseek(fs->f, offset, SEEK_SET) < 0)
    
    		return -1;
    	return 0;
    }
    
    static int ilbc_trunc(struct ast_filestream *fs)
    {
    	/* Truncate file to current length */
    
    	if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0)
    
    		return -1;
    	return 0;
    }
    
    static long ilbc_tell(struct ast_filestream *fs)
    {
    	off_t offset;
    
    	return (offset/50)*240;
    }
    
    int load_module()
    {
    	return ast_format_register(name, exts, AST_FORMAT_ILBC,
    								ilbc_open,
    								ilbc_rewrite,
    								ilbc_write,
    								ilbc_seek,
    								ilbc_trunc,
    								ilbc_tell,
    								ilbc_read,
    								ilbc_close,
    								ilbc_getcomment);
    								
    								
    }
    
    int unload_module()
    {
    	return ast_format_unregister(name);
    }	
    
    int usecount()
    {
    
    }
    
    char *description()
    {
    	return desc;
    }
    
    
    char *key()
    {
    	return ASTERISK_GPL_KEY;
    }