EXPORT_DEF int at_wait (int fd, int* ms)
{
int exception, outfd;
outfd = ast_waitfor_n_fd (&fd, 1, ms, &exception);
if (outfd < 0)
{
outfd = 0;
}
return outfd;
}
static struct ast_frame *bestdata_read(struct ast_modem_pvt *p)
{
char result[256];
short *b;
struct ast_frame *f=NULL;
int res;
int x;
if (p->ministate == STATE_COMMAND) {
/* Read the first two bytes, first, in case it's a control message */
fread(result, 1, 2, p->f);
if (result[0] == CHAR_DLE) {
return bestdata_handle_escape(p, result[1]);
} else {
if (p->ringt) /* if ring timeout specified */
{
x = fileno(p->f);
res = ast_waitfor_n_fd(&x, 1, &p->ringt, NULL);
if (res < 0) {
return NULL;
}
}
if ((result[0] == '\n') || (result[0] == '\r'))
return bestdata_handle_escape(p, 0);
/* Read the rest of the line */
fgets(result + 2, sizeof(result) - 2, p->f);
ast_modem_trim(result);
if (!strcasecmp(result, "OK")) {
/* If we're in immediate mode, reply now */
if (p->mode == MODEM_MODE_IMMEDIATE)
return bestdata_handle_escape(p, '@');
} else
if (!strcasecmp(result, "BUSY")) {
/* Same as a busy signal */
return bestdata_handle_escape(p, 'b');
} else
if (!strcasecmp(result, "RING")) {
return bestdata_handle_escape(p, 'R');
} else
if (!strcasecmp(result, "NO DIALTONE")) {
/* There's no dialtone, so the line isn't working */
ast_log(LOG_WARNING, "Device '%s' lacking dialtone\n", p->dev);
return NULL;
}
ast_log(LOG_DEBUG, "Modem said '%s'\n", result);
return bestdata_handle_escape(p, 0);
}
} else {
/* if playing, start recording instead */
if (p->ministate == STATE_VOICEPLAY)
{
if (bestdata_startrec(p)) return NULL;
}
/* We have to be more efficient in voice mode */
b = (short *)(p->obuf + p->obuflen);
while (p->obuflen/2 < 240) {
/* Read ahead the full amount */
res = fread(result, 1, 240 - p->obuflen/2, p->f);
if (res < 1) {
/* If there's nothing there, just continue on */
if (errno == EAGAIN)
return bestdata_handle_escape(p, 0);
ast_log(LOG_WARNING, "Read failed: %s\n", strerror(errno));
}
for (x=0;x<res;x++) {
/* Process all the bytes that we've read */
if (result[x] == CHAR_DLE) {
/* We assume there is no more than one signal frame among our
data. */
if (f) ast_log(LOG_WARNING, "Warning: Dropped a signal frame\n");
/* if not a DLE in the data */
if (result[++x] != CHAR_DLE)
{
/* If bestdata_handle_escape says NULL, say it now, doesn't matter
what else is there, the connection is dead. */
f = bestdata_handle_escape(p, result[x]);
if (p->dtmfrx) continue;
return(f);
}
}
/* Generate a 16-bit signed linear value from our
unsigned 8-bit value */
*(b++) = (((short)result[x]) - 127) * 0xff;
p->obuflen += 2;
}
if (f) break;
}
/* If we have a control frame, return it now */
if (f) return f;
/* If we get here, we have a complete voice frame */
p->fr.frametype = AST_FRAME_VOICE;
p->fr.subclass = AST_FORMAT_SLINEAR;
p->fr.samples = 240;
p->fr.data = p->obuf;
p->fr.datalen = p->obuflen;
p->fr.mallocd = 0;
p->fr.delivery.tv_sec = 0;
p->fr.delivery.tv_usec = 0;
p->fr.offset = AST_FRIENDLY_OFFSET;
p->fr.src = __FUNCTION__;
if (option_debug)
ast_log(LOG_DEBUG, "bestdata_read(voice frame)\n");
p->obuflen = 0;
return &p->fr;
}
return NULL;
}