-/*! \brief
- * Handler for 'sound writable' events from the sound thread.
- * Builds a frame from the high level description of the sounds,
- * and passes it to the audio device.
- * The actual sound is made of 1 or more sequences of sound samples
- * (s->datalen, repeated to make s->samplen samples) followed by
- * s->silencelen samples of silence. The position in the sequence is stored
- * in o->sampsent, which goes between 0 .. s->samplen+s->silencelen.
- * In case we fail to write a frame, don't update o->sampsent.
- */
-static void send_sound(struct chan_usbradio_pvt *o)
-{
- short myframe[FRAME_SIZE];
- int ofs, l, start;
- int l_sampsent = o->sampsent;
- struct sound *s;
-
- if (o->cursound < 0) /* no sound to send */
- return;
-
- s = &sounds[o->cursound];
-
- for (ofs = 0; ofs < FRAME_SIZE; ofs += l) {
- l = s->samplen - l_sampsent; /* # of available samples */
- if (l > 0) {
- start = l_sampsent % s->datalen; /* source offset */
- if (l > FRAME_SIZE - ofs) /* don't overflow the frame */
- l = FRAME_SIZE - ofs;
- if (l > s->datalen - start) /* don't overflow the source */
- l = s->datalen - start;
- memcpy(myframe + ofs, s->data + start, l * 2);
- ast_debug(4, "send_sound sound %d/%d of %d into %d\n", l_sampsent, l, s->samplen, ofs);
- l_sampsent += l;
- } else { /* end of samples, maybe some silence */
- static const short silence[FRAME_SIZE] = { 0, };
-
- l += s->silencelen;
- if (l > 0) {
- if (l > FRAME_SIZE - ofs)
- l = FRAME_SIZE - ofs;
- memcpy(myframe + ofs, silence, l * 2);
- l_sampsent += l;
- } else { /* silence is over, restart sound if loop */
- if (s->repeat == 0) { /* last block */
- o->cursound = -1;
- o->nosound = 0; /* allow audio data */
- if (ofs < FRAME_SIZE) /* pad with silence */
- memcpy(myframe + ofs, silence, (FRAME_SIZE - ofs) * 2);
- }
- l_sampsent = 0;
- }
- }
- }
- l = soundcard_writeframe(o, myframe);
- if (l > 0)
- o->sampsent = l_sampsent; /* update status */
-}
-
-static void *sound_thread(void *arg)
-{
- char ign[4096];
- struct chan_usbradio_pvt *o = arg;
-
- /*
- * Just in case, kick the driver by trying to read from it.
- * Ignore errors - this read is almost guaranteed to fail.
- */
- read(o->sounddev, ign, sizeof(ign));
- for (;;) {
- fd_set rfds, wfds;
- int maxfd, res;
-
- FD_ZERO(&rfds);
- FD_ZERO(&wfds);
- FD_SET(o->sndcmd[0], &rfds);
- maxfd = o->sndcmd[0]; /* pipe from the main process */
- if (o->cursound > -1 && o->sounddev < 0)
- setformat(o, O_RDWR); /* need the channel, try to reopen */
- else if (o->cursound == -1 && o->owner == NULL)
- setformat(o, O_CLOSE); /* can close */
- if (o->sounddev > -1) {
- if (!o->owner) { /* no one owns the audio, so we must drain it */
- FD_SET(o->sounddev, &rfds);
- maxfd = MAX(o->sounddev, maxfd);
- }
- if (o->cursound > -1) {
- FD_SET(o->sounddev, &wfds);
- maxfd = MAX(o->sounddev, maxfd);
- }
- }
- /* ast_select emulates linux behaviour in terms of timeout handling */
- res = ast_select(maxfd + 1, &rfds, &wfds, NULL, NULL);
- if (res < 1) {
- ast_log(LOG_WARNING, "select failed: %s\n", strerror(errno));
- sleep(1);
- continue;
- }
- if (FD_ISSET(o->sndcmd[0], &rfds)) {
- /* read which sound to play from the pipe */
- int i, what = -1;
-
- read(o->sndcmd[0], &what, sizeof(what));
- for (i = 0; sounds[i].ind != -1; i++) {
- if (sounds[i].ind == what) {
- o->cursound = i;
- o->sampsent = 0;
- o->nosound = 1; /* block audio from pbx */
- break;
- }
- }
- if (sounds[i].ind == -1)
- ast_log(LOG_WARNING, "invalid sound index: %d\n", what);
- }
- if (o->sounddev > -1) {
- if (FD_ISSET(o->sounddev, &rfds)) /* read and ignore errors */
- read(o->sounddev, ign, sizeof(ign));
- if (FD_ISSET(o->sounddev, &wfds))
- send_sound(o);
- }
- }
- return NULL; /* Never reached */
-}
-
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