formats/format_ilbc.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Brian K. West <brian@bkw.org>
   5  *
   6  * Copyright (C) 1999 - 2005, Digium, Inc.
   7  *
   8  * Mark Spencer <markster@digium.com>
   9  *
  10  * See http://www.asterisk.org for more information about
  11  * the Asterisk project. Please do not directly contact
  12  * any of the maintainers of this project for assistance;
  13  * the project provides a web site, mailing lists and IRC
  14  * channels for your use.
  15  *
  16  * This program is free software, distributed under the terms of
  17  * the GNU General Public License Version 2. See the LICENSE file
  18  * at the top of the source tree.
  19  */
  20
  21 /*! \file
  22  *
  23  * \brief Save to raw, headerless iLBC data.
  24  * \arg File name extension: ilbc
  25  * \ingroup formats
  26  */
  27
  28 #include "asterisk.h"
  29
  30 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  31
  32 #include <unistd.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <stdlib.h>
  36 #include <sys/time.h>
  37 #include <stdio.h>
  38 #include <errno.h>
  39 #include <string.h>
  40
  41 #include "asterisk/lock.h"
  42 #include "asterisk/channel.h"
  43 #include "asterisk/file.h"
  44 #include "asterisk/logger.h"
  45 #include "asterisk/sched.h"
  46 #include "asterisk/module.h"
  47 #include "asterisk/endian.h"
  48
  49 /* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */
  50
  51 /* Portions of the conversion code are by guido@sienanet.it */
  52
  53 #define ILBC_BUF_SIZE   50      /* One Real iLBC Frame */
  54 #define ILBC_SAMPLES    240
  55
  56 static struct ast_frame *ilbc_read(struct ast_filestream *s, int *whennext)
  57 {
  58         int res;
  59         /* Send a frame from the file to the appropriate channel */
  60         s->fr.frametype = AST_FRAME_VOICE;
  61         s->fr.subclass = AST_FORMAT_ILBC;
  62         s->fr.mallocd = 0;
  63         AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE);
  64         if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
  65                 if (res)
  66                         ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
  67                 return NULL;
  68         }
  69         *whennext = s->fr.samples = ILBC_SAMPLES;
  70         return &s->fr;
  71 }
  72
  73 static int ilbc_write(struct ast_filestream *fs, struct ast_frame *f)
  74 {
  75         int res;
  76         if (f->frametype != AST_FRAME_VOICE) {
  77                 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
  78                 return -1;
  79         }
  80         if (f->subclass != AST_FORMAT_ILBC) {
  81                 ast_log(LOG_WARNING, "Asked to write non-iLBC frame (%d)!\n", f->subclass);
  82                 return -1;
  83         }
  84         if (f->datalen % 50) {
  85                 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
  86                 return -1;
  87         }
  88         if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
  89                         ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
  90                         return -1;
  91         }
  92         return 0;
  93 }
  94
  95 static int ilbc_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
  96 {
  97         long bytes;
  98         off_t min,cur,max,offset=0;
  99         min = 0;
 100         cur = ftello(fs->f);
 101         fseeko(fs->f, 0, SEEK_END);
 102         max = ftello(fs->f);
 103
 104         bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
 105         if (whence == SEEK_SET)
 106                 offset = bytes;
 107         else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
 108                 offset = cur + bytes;
 109         else if (whence == SEEK_END)
 110                 offset = max - bytes;
 111         if (whence != SEEK_FORCECUR) {
 112                 offset = (offset > max)?max:offset;
 113         }
 114         /* protect against seeking beyond begining. */
 115         offset = (offset < min)?min:offset;
 116         if (fseeko(fs->f, offset, SEEK_SET) < 0)
 117                 return -1;
 118         return 0;
 119 }
 120
 121 static int ilbc_trunc(struct ast_filestream *fs)
 122 {
 123         /* Truncate file to current length */
 124         if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
 125                 return -1;
 126         return 0;
 127 }
 128
 129 static off_t ilbc_tell(struct ast_filestream *fs)
 130 {
 131         off_t offset = ftello(fs->f);
 132         return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES;
 133 }
 134
 135 static const struct ast_format ilbc_f = {
 136         .name = "iLBC",
 137         .exts = "ilbc",
 138         .format = AST_FORMAT_ILBC,
 139         .write = ilbc_write,
 140         .seek = ilbc_seek,
 141         .trunc = ilbc_trunc,
 142         .tell = ilbc_tell,
 143         .read = ilbc_read,
 144         .buf_size = ILBC_BUF_SIZE + AST_FRIENDLY_OFFSET,
 145 };
 146
 147 static int load_module(void)
 148 {
 149         return ast_format_register(&ilbc_f);
 150 }
 151
 152 static int unload_module(void)
 153 {
 154         return ast_format_unregister(ilbc_f.name);
 155 }
 156
 157 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw iLBC data");