formats/format_vox.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Flat, binary, ADPCM vox file format.
  22  * \arg File name extensions: vox
  23  *
  24  * \ingroup formats
  25  */
  26
  27 #include <unistd.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <stdlib.h>
  31 #include <sys/time.h>
  32 #include <stdio.h>
  33 #include <errno.h>
  34 #include <string.h>
  35
  36 #include "asterisk.h"
  37
  38 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  39
  40 #include "asterisk/lock.h"
  41 #include "asterisk/channel.h"
  42 #include "asterisk/file.h"
  43 #include "asterisk/logger.h"
  44 #include "asterisk/sched.h"
  45 #include "asterisk/module.h"
  46 #include "asterisk/endian.h"
  47
  48 #define BUF_SIZE 80             /* 160 samples */
  49
  50 struct ast_filestream {
  51         void *reserved[AST_RESERVED_POINTERS];
  52         /* This is what a filestream means to us */
  53         FILE *f; /* Descriptor */
  54         struct ast_frame fr;                            /* Frame information */
  55         char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
  56         char empty;                                                     /* Empty character */
  57         unsigned char buf[BUF_SIZE];    /* Output Buffer */
  58         int lasttimeout;
  59         struct timeval last;
  60         short signal;                                           /* Signal level (file side) */
  61         short ssindex;                                          /* Signal ssindex (file side) */
  62         unsigned char zero_count;                               /* counter of consecutive zero samples */
  63         unsigned char next_flag;
  64 };
  65
  66
  67 AST_MUTEX_DEFINE_STATIC(vox_lock);
  68 static int glistcnt = 0;
  69
  70 static char *name = "vox";
  71 static char *desc = "Dialogic VOX (ADPCM) File Format";
  72 static char *exts = "vox";
  73
  74 static struct ast_filestream *vox_open(FILE *f)
  75 {
  76         /* We don't have any header to read or anything really, but
  77            if we did, it would go here.  We also might want to check
  78            and be sure it's a valid file.  */
  79         struct ast_filestream *tmp;
  80         if ((tmp = malloc(sizeof(struct ast_filestream)))) {
  81                 memset(tmp, 0, sizeof(struct ast_filestream));
  82                 if (ast_mutex_lock(&vox_lock)) {
  83                         ast_log(LOG_WARNING, "Unable to lock vox list\n");
  84                         free(tmp);
  85                         return NULL;
  86                 }
  87                 tmp->f = f;
  88                 tmp->fr.data = tmp->buf;
  89                 tmp->fr.frametype = AST_FRAME_VOICE;
  90                 tmp->fr.subclass = AST_FORMAT_ADPCM;
  91                 /* datalen will vary for each frame */
  92                 tmp->fr.src = name;
  93                 tmp->fr.mallocd = 0;
  94                 tmp->lasttimeout = -1;
  95                 glistcnt++;
  96                 ast_mutex_unlock(&vox_lock);
  97                 ast_update_use_count();
  98         }
  99         return tmp;
 100 }
 101
 102 static struct ast_filestream *vox_rewrite(FILE *f, const char *comment)
 103 {
 104         /* We don't have any header to read or anything really, but
 105            if we did, it would go here.  We also might want to check
 106            and be sure it's a valid file.  */
 107         struct ast_filestream *tmp;
 108         if ((tmp = malloc(sizeof(struct ast_filestream)))) {
 109                 memset(tmp, 0, sizeof(struct ast_filestream));
 110                 if (ast_mutex_lock(&vox_lock)) {
 111                         ast_log(LOG_WARNING, "Unable to lock vox list\n");
 112                         free(tmp);
 113                         return NULL;
 114                 }
 115                 tmp->f = f;
 116                 glistcnt++;
 117                 ast_mutex_unlock(&vox_lock);
 118                 ast_update_use_count();
 119         } else
 120                 ast_log(LOG_WARNING, "Out of memory\n");
 121         return tmp;
 122 }
 123
 124 static void vox_close(struct ast_filestream *s)
 125 {
 126         if (ast_mutex_lock(&vox_lock)) {
 127                 ast_log(LOG_WARNING, "Unable to lock vox list\n");
 128                 return;
 129         }
 130         glistcnt--;
 131         ast_mutex_unlock(&vox_lock);
 132         ast_update_use_count();
 133         fclose(s->f);
 134         free(s);
 135         s = NULL;
 136 }
 137
 138 static struct ast_frame *vox_read(struct ast_filestream *s, int *whennext)
 139 {
 140         int res;
 141         /* Send a frame from the file to the appropriate channel */
 142         s->fr.frametype = AST_FRAME_VOICE;
 143         s->fr.subclass = AST_FORMAT_ADPCM;
 144         s->fr.offset = AST_FRIENDLY_OFFSET;
 145         s->fr.mallocd = 0;
 146         s->fr.data = s->buf;
 147         if ((res = fread(s->buf, 1, BUF_SIZE, s->f)) < 1) {
 148                 if (res)
 149                         ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
 150                 return NULL;
 151         }
 152         s->fr.samples = res * 2;
 153         s->fr.datalen = res;
 154         *whennext = s->fr.samples;
 155         return &s->fr;
 156 }
 157
 158 static int vox_write(struct ast_filestream *fs, struct ast_frame *f)
 159 {
 160         int res;
 161         if (f->frametype != AST_FRAME_VOICE) {
 162                 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
 163                 return -1;
 164         }
 165         if (f->subclass != AST_FORMAT_ADPCM) {
 166                 ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%d)!\n", f->subclass);
 167                 return -1;
 168         }
 169         if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
 170                         ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
 171                         return -1;
 172         }
 173         return 0;
 174 }
 175
 176 static char *vox_getcomment(struct ast_filestream *s)
 177 {
 178         return NULL;
 179 }
 180
 181 static int vox_seek(struct ast_filestream *fs, long sample_offset, int whence)
 182 {
 183      off_t offset=0,min,cur,max,distance;
 184
 185      min = 0;
 186      cur = ftell(fs->f);
 187      fseek(fs->f, 0, SEEK_END);
 188          max = ftell(fs->f);
 189
 190      /* have to fudge to frame here, so not fully to sample */
 191      distance = sample_offset/2;
 192      if(whence == SEEK_SET)
 193           offset = distance;
 194      else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
 195           offset = distance + cur;
 196      else if(whence == SEEK_END)
 197           offset = max - distance;
 198      if (whence != SEEK_FORCECUR) {
 199           offset = (offset > max)?max:offset;
 200           offset = (offset < min)?min:offset;
 201      }
 202      fseek(fs->f, offset, SEEK_SET);
 203          return ftell(fs->f);
 204 }
 205
 206 static int vox_trunc(struct ast_filestream *fs)
 207 {
 208      return ftruncate(fileno(fs->f), ftell(fs->f));
 209 }
 210
 211 static long vox_tell(struct ast_filestream *fs)
 212 {
 213      off_t offset;
 214      offset = ftell(fs->f) << 1;
 215      return offset;
 216 }
 217
 218 int load_module()
 219 {
 220         return ast_format_register(name, exts, AST_FORMAT_ADPCM,
 221                                                                 vox_open,
 222                                                                 vox_rewrite,
 223                                                                 vox_write,
 224                                                                 vox_seek,
 225                                                                 vox_trunc,
 226                                                                 vox_tell,
 227                                                                 vox_read,
 228                                                                 vox_close,
 229                                                                 vox_getcomment);
 230
 231
 232 }
 233
 234 int unload_module()
 235 {
 236         return ast_format_unregister(name);
 237 }
 238
 239 int usecount()
 240 {
 241         return glistcnt;
 242 }
 243
 244 char *description()
 245 {
 246         return desc;
 247 }
 248
 249
 250 char *key()
 251 {
 252         return ASTERISK_GPL_KEY;
 253 }