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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 */
    
    
    #define	ILBC_BUF_SIZE	50	/* One Real iLBC Frame */
    #define	ILBC_SAMPLES	240
    
    
    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.mallocd = 0;
    
    	FR_SET_BUF(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE);
    	if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
    
    		if (res)
    			ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
    		return NULL;
    	}
    
    	*whennext = s->fr.samples = ILBC_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));
    
    static int ilbc_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
    
    {
    	long bytes;
    	off_t min,cur,max,offset=0;
    	min = 0;
    
    	cur = ftello(fs->f);
    	fseeko(fs->f, 0, SEEK_END);
    	max = ftello(fs->f);
    
    	bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
    
    	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 (fseeko(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), ftello(fs->f)) < 0)
    
    static off_t ilbc_tell(struct ast_filestream *fs)
    
    	off_t offset = ftello(fs->f);
    	return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES;
    
    static struct ast_format_lock me = { .usecnt = -1 };
    
    static const struct ast_format ilbc_f = {
    	.name = "iLBC",
    	.exts = "ilbc",
    	.format = AST_FORMAT_ILBC,
    	.write = ilbc_write,
    	.seek = ilbc_seek,
    	.trunc = ilbc_trunc,
    	.tell = ilbc_tell,
    	.read = ilbc_read,
    	.buf_size = ILBC_BUF_SIZE + AST_FRIENDLY_OFFSET,
    	.lockp = &me,
    };
    
    
    	return ast_format_register(&ilbc_f);
    
    	return ast_format_unregister(ilbc_f.name);
    
    	return "Raw iLBC data";
    
    {
    	return ASTERISK_GPL_KEY;
    }