formats/format_g729.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Save to raw, headerless G729 data.
   5  *
   6  * Copyright (C) 1999, Mark Spencer
   7  *
   8  * Mark Spencer <markster@linux-support.net>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14 #include <asterisk/lock.h>
  15 #include <asterisk/channel.h>
  16 #include <asterisk/file.h>
  17 #include <asterisk/logger.h>
  18 #include <asterisk/sched.h>
  19 #include <asterisk/module.h>
  20 #include <arpa/inet.h>
  21 #include <stdlib.h>
  22 #include <sys/time.h>
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <pthread.h>
  28 #include <endian.h>
  29
  30 /* Some Ideas for this code came from makeg729e.c by Jeffery Chilton */
  31
  32 /* Portions of the conversion code are by guido@sienanet.it */
  33
  34 struct ast_filestream {
  35         void *reserved[AST_RESERVED_POINTERS];
  36         /* Believe it or not, we must decode/recode to account for the
  37            weird MS format */
  38         /* This is what a filestream means to us */
  39         int fd; /* Descriptor */
  40         struct ast_channel *owner;
  41         struct ast_frame fr;                            /* Frame information */
  42         char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
  43         char empty;                                                     /* Empty character */
  44         unsigned char g729[20];                         /* Two Real G729 Frames */
  45         int lasttimeout;
  46         struct timeval last;
  47         int adj;
  48         struct ast_filestream *next;
  49 };
  50
  51
  52 static struct ast_filestream *glist = NULL;
  53 static pthread_mutex_t g729_lock = AST_MUTEX_INITIALIZER;
  54 static int glistcnt = 0;
  55
  56 static char *name = "g729";
  57 static char *desc = "Raw G729 data";
  58 static char *exts = "g729";
  59
  60 static struct ast_filestream *g729_open(int fd)
  61 {
  62         /* We don't have any header to read or anything really, but
  63            if we did, it would go here.  We also might want to check
  64            and be sure it's a valid file.  */
  65         struct ast_filestream *tmp;
  66         if ((tmp = malloc(sizeof(struct ast_filestream)))) {
  67                 memset(tmp, 0, sizeof(struct ast_filestream));
  68                 if (ast_pthread_mutex_lock(&g729_lock)) {
  69                         ast_log(LOG_WARNING, "Unable to lock g729 list\n");
  70                         free(tmp);
  71                         return NULL;
  72                 }
  73                 tmp->next = glist;
  74                 glist = tmp;
  75                 tmp->fd = fd;
  76                 tmp->owner = NULL;
  77                 tmp->fr.data = tmp->g729;
  78                 tmp->fr.frametype = AST_FRAME_VOICE;
  79                 tmp->fr.subclass = AST_FORMAT_G729A;
  80                 /* datalen will vary for each frame */
  81                 tmp->fr.src = name;
  82                 tmp->fr.mallocd = 0;
  83                 tmp->lasttimeout = -1;
  84                 glistcnt++;
  85                 ast_pthread_mutex_unlock(&g729_lock);
  86                 ast_update_use_count();
  87         }
  88         return tmp;
  89 }
  90
  91 static struct ast_filestream *g729_rewrite(int fd, char *comment)
  92 {
  93         /* We don't have any header to read or anything really, but
  94            if we did, it would go here.  We also might want to check
  95            and be sure it's a valid file.  */
  96         struct ast_filestream *tmp;
  97         if ((tmp = malloc(sizeof(struct ast_filestream)))) {
  98                 memset(tmp, 0, sizeof(struct ast_filestream));
  99                 if (ast_pthread_mutex_lock(&g729_lock)) {
 100                         ast_log(LOG_WARNING, "Unable to lock g729 list\n");
 101                         free(tmp);
 102                         return NULL;
 103                 }
 104                 tmp->next = glist;
 105                 glist = tmp;
 106                 tmp->fd = fd;
 107                 tmp->owner = NULL;
 108                 tmp->lasttimeout = -1;
 109                 glistcnt++;
 110                 ast_pthread_mutex_unlock(&g729_lock);
 111                 ast_update_use_count();
 112         } else
 113                 ast_log(LOG_WARNING, "Out of memory\n");
 114         return tmp;
 115 }
 116
 117 static struct ast_frame *g729_read(struct ast_filestream *s)
 118 {
 119         return NULL;
 120 }
 121
 122 static void g729_close(struct ast_filestream *s)
 123 {
 124         struct ast_filestream *tmp, *tmpl = NULL;
 125         if (ast_pthread_mutex_lock(&g729_lock)) {
 126                 ast_log(LOG_WARNING, "Unable to lock g729 list\n");
 127                 return;
 128         }
 129         tmp = glist;
 130         while(tmp) {
 131                 if (tmp == s) {
 132                         if (tmpl)
 133                                 tmpl->next = tmp->next;
 134                         else
 135                                 glist = tmp->next;
 136                         break;
 137                 }
 138                 tmpl = tmp;
 139                 tmp = tmp->next;
 140         }
 141         glistcnt--;
 142         if (s->owner) {
 143                 s->owner->stream = NULL;
 144                 if (s->owner->streamid > -1)
 145                         ast_sched_del(s->owner->sched, s->owner->streamid);
 146                 s->owner->streamid = -1;
 147         }
 148         ast_pthread_mutex_unlock(&g729_lock);
 149         ast_update_use_count();
 150         if (!tmp)
 151                 ast_log(LOG_WARNING, "Freeing a filestream we don't seem to own\n");
 152         close(s->fd);
 153         free(s);
 154         s = NULL;
 155 }
 156
 157 static int ast_read_callback(void *data)
 158 {
 159         int retval = 0;
 160         int res;
 161         int delay = 20;
 162         struct ast_filestream *s = data;
 163         struct timeval tv;
 164         /* Send a frame from the file to the appropriate channel */
 165
 166         s->fr.frametype = AST_FRAME_VOICE;
 167         s->fr.subclass = AST_FORMAT_G729A;
 168         s->fr.offset = AST_FRIENDLY_OFFSET;
 169         s->fr.samples = 160;
 170         s->fr.datalen = 20;
 171         s->fr.mallocd = 0;
 172         s->fr.data = s->g729;
 173         if ((res = read(s->fd, s->g729, 20)) != 20) {
 174                 if (res)
 175                         ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
 176                 s->owner->streamid = -1;
 177                 return 0;
 178         }
 179         /* Lastly, process the frame */
 180         if (ast_write(s->owner, &s->fr)) {
 181                 ast_log(LOG_WARNING, "Failed to write frame\n");
 182                 s->owner->streamid = -1;
 183                 return 0;
 184         }
 185         if (s->last.tv_usec || s->last.tv_usec) {
 186                 int ms;
 187                 gettimeofday(&tv, NULL);
 188                 ms = 1000 * (tv.tv_sec - s->last.tv_sec) +
 189                         (tv.tv_usec - s->last.tv_usec) / 1000;
 190                 s->last.tv_sec = tv.tv_sec;
 191                 s->last.tv_usec = tv.tv_usec;
 192                 if ((ms - delay) * (ms - delay) > 4) {
 193                         /* Compensate if we're more than 2 ms off */
 194                         s->adj -= (ms - delay);
 195                 }
 196 #if 0
 197                 fprintf(stdout, "Delay is %d, adjustment is %d, last was %d\n", delay, s->adj, ms);
 198 #endif
 199                 delay += s->adj;
 200                 if (delay < 1)
 201                         delay = 1;
 202         } else
 203                 gettimeofday(&s->last, NULL);
 204         if (s->lasttimeout != delay) {
 205                 /* We'll install the next timeout now. */
 206                 s->owner->streamid = ast_sched_add(s->owner->sched,
 207                                 delay, ast_read_callback, s);
 208                 s->lasttimeout = delay;
 209         } else {
 210                 /* Just come back again at the same time */
 211                 retval = -1;
 212         }
 213         return retval;
 214 }
 215
 216 static int g729_apply(struct ast_channel *c, struct ast_filestream *s)
 217 {
 218         /* Select our owner for this stream, and get the ball rolling. */
 219         s->owner = c;
 220         return 0;
 221 }
 222
 223 static int g729_play(struct ast_filestream *s)
 224 {
 225         ast_read_callback(s);
 226         return 0;
 227 }
 228
 229 static int g729_write(struct ast_filestream *fs, struct ast_frame *f)
 230 {
 231         int res;
 232         if (f->frametype != AST_FRAME_VOICE) {
 233                 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
 234                 return -1;
 235         }
 236         if (f->subclass != AST_FORMAT_G729A) {
 237                 ast_log(LOG_WARNING, "Asked to write non-G729 frame (%d)!\n", f->subclass);
 238                 return -1;
 239         }
 240         if (f->datalen % 20) {
 241                 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 20\n", f->datalen);
 242                 return -1;
 243         }
 244         if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
 245                         ast_log(LOG_WARNING, "Bad write (%d/20): %s\n", res, strerror(errno));
 246                         return -1;
 247         }
 248         return 0;
 249 }
 250
 251 static char *g729_getcomment(struct ast_filestream *s)
 252 {
 253         return NULL;
 254 }
 255
 256 static int g729_seek(struct ast_filestream *fs, long sample_offset, int whence)
 257 {
 258         long bytes;
 259         off_t min,cur,max,offset;
 260         min = 0;
 261         cur = lseek(fs->fd, 0, SEEK_CUR);
 262         max = lseek(fs->fd, 0, SEEK_END);
 263
 264         bytes = 20 * (sample_offset / 160);
 265         if(whence == SEEK_SET)
 266                 offset = bytes;
 267         if(whence == SEEK_CUR)
 268                 offset = cur + bytes;
 269         if(whence == SEEK_END)
 270                 offset = max - bytes;
 271         offset = (offset > max)?max:offset;
 272         offset = (offset < min)?min:offset;
 273         if (lseek(fs->fd, offset, SEEK_SET) < 0)
 274                 return -1;
 275         return 0;
 276 }
 277
 278 static int g729_trunc(struct ast_filestream *fs)
 279 {
 280         /* Truncate file to current length */
 281         if (ftruncate(fs->fd, lseek(fs->fd, 0, SEEK_CUR)) < 0)
 282                 return -1;
 283         return 0;
 284 }
 285
 286 static long g729_tell(struct ast_filestream *fs)
 287 {
 288         off_t offset;
 289         offset = lseek(fs->fd, 0, SEEK_CUR);
 290         return (offset/20)*160;
 291 }
 292
 293 int load_module()
 294 {
 295         return ast_format_register(name, exts, AST_FORMAT_G729A,
 296                                                                 g729_open,
 297                                                                 g729_rewrite,
 298                                                                 g729_apply,
 299                                                                 g729_play,
 300                                                                 g729_write,
 301                                                                 g729_seek,
 302                                                                 g729_trunc,
 303                                                                 g729_tell,
 304                                                                 g729_read,
 305                                                                 g729_close,
 306                                                                 g729_getcomment);
 307
 308
 309 }
 310
 311 int unload_module()
 312 {
 313         struct ast_filestream *tmp, *tmpl;
 314         if (ast_pthread_mutex_lock(&g729_lock)) {
 315                 ast_log(LOG_WARNING, "Unable to lock g729 list\n");
 316                 return -1;
 317         }
 318         tmp = glist;
 319         while(tmp) {
 320                 if (tmp->owner)
 321                         ast_softhangup(tmp->owner, AST_SOFTHANGUP_APPUNLOAD);
 322                 tmpl = tmp;
 323                 tmp = tmp->next;
 324                 free(tmpl);
 325         }
 326         ast_pthread_mutex_unlock(&g729_lock);
 327         return ast_format_unregister(name);
 328 }
 329
 330 int usecount()
 331 {
 332         int res;
 333         if (ast_pthread_mutex_lock(&g729_lock)) {
 334                 ast_log(LOG_WARNING, "Unable to lock g729 list\n");
 335                 return -1;
 336         }
 337         res = glistcnt;
 338         ast_pthread_mutex_unlock(&g729_lock);
 339         return res;
 340 }
 341
 342 char *description()
 343 {
 344         return desc;
 345 }
 346
 347
 348 char *key()
 349 {
 350         return ASTERISK_GPL_KEY;
 351 }