/*! \brief Callback function for reading from a Snoop channel */
static struct ast_frame *snoop_read(struct ast_channel *chan)
{
struct stasis_app_snoop *snoop = ast_channel_tech_pvt(chan);
struct ast_frame *frame = NULL;
/* If we fail to ack the timer OR if any active audiohooks are done hangup */
if ((ast_timer_ack(snoop->timer, 1) < 0) ||
(snoop->spy_active && snoop->spy.status != AST_AUDIOHOOK_STATUS_RUNNING) ||
(snoop->whisper_active && snoop->whisper.status != AST_AUDIOHOOK_STATUS_RUNNING)) {
return NULL;
}
/* Only get audio from the spy audiohook if it is active */
if (snoop->spy_active) {
ast_audiohook_lock(&snoop->spy);
frame = ast_audiohook_read_frame(&snoop->spy, snoop->spy_samples, snoop->spy_direction, snoop->spy_format);
ast_audiohook_unlock(&snoop->spy);
}
return frame ? frame : &ast_null_frame;
}
/*! \brief Callback function for reading from a Snoop channel */
static struct ast_frame *snoop_read(struct ast_channel *chan)
{
struct stasis_app_snoop *snoop = ast_channel_tech_pvt(chan);
struct ast_frame *frame = NULL;
/* If we fail to ack the timer OR if any active audiohooks are done hangup */
if ((ast_timer_ack(snoop->timer, 1) < 0) ||
(snoop->spy_active && snoop->spy.status != AST_AUDIOHOOK_STATUS_RUNNING) ||
(snoop->whisper_active && snoop->whisper.status != AST_AUDIOHOOK_STATUS_RUNNING)) {
return NULL;
}
/* Only get audio from the spy audiohook if it is active */
if (!snoop->spy_active) {
return &ast_null_frame;
}
ast_audiohook_lock(&snoop->spy);
if (snoop->spy_direction != AST_AUDIOHOOK_DIRECTION_BOTH) {
/*
* When a singular direction is chosen frames are still written to the
* opposing direction's queue. Those frames must be read so the queue
* does not continue to grow, however since they are not needed for the
* selected direction they can be dropped.
*/
enum ast_audiohook_direction opposing_direction =
snoop->spy_direction == AST_AUDIOHOOK_DIRECTION_READ ?
AST_AUDIOHOOK_DIRECTION_WRITE : AST_AUDIOHOOK_DIRECTION_READ;
ast_frame_dtor(ast_audiohook_read_frame(&snoop->spy, snoop->spy_samples,
opposing_direction, snoop->spy_format));
}
frame = ast_audiohook_read_frame(&snoop->spy, snoop->spy_samples, snoop->spy_direction, snoop->spy_format);
ast_audiohook_unlock(&snoop->spy);
return frame ? frame : &ast_null_frame;
}
static char *timing_test(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct ast_timer *timer;
int count = 0;
struct timeval start, end;
unsigned int test_rate = 50;
switch (cmd) {
case CLI_INIT:
e->command = "timing test";
e->usage = "Usage: timing test <rate>\n"
" Test a timer with a specified rate, 50/sec by default.\n"
"";
return NULL;
case CLI_GENERATE:
return NULL;
}
if (a->argc != 2 && a->argc != 3) {
return CLI_SHOWUSAGE;
}
if (a->argc == 3) {
unsigned int rate;
if (sscanf(a->argv[2], "%30u", &rate) == 1) {
test_rate = rate;
} else {
ast_cli(a->fd, "Invalid rate '%s', using default of %u\n", a->argv[2], test_rate);
}
}
ast_cli(a->fd, "Attempting to test a timer with %u ticks per second.\n", test_rate);
if (!(timer = ast_timer_open())) {
ast_cli(a->fd, "Failed to open timing fd\n");
return CLI_FAILURE;
}
ast_cli(a->fd, "Using the '%s' timing module for this test.\n", timer->holder->iface->name);
start = ast_tvnow();
ast_timer_set_rate(timer, test_rate);
while (ast_tvdiff_ms((end = ast_tvnow()), start) < 1000) {
int res;
struct pollfd pfd = {
.fd = ast_timer_fd(timer),
.events = POLLIN | POLLPRI,
};
res = ast_poll(&pfd, 1, 100);
if (res == 1) {
count++;
if (ast_timer_ack(timer, 1) < 0) {
ast_cli(a->fd, "Timer failed to acknowledge.\n");
ast_timer_close(timer);
return CLI_FAILURE;
}
} else if (!res) {
ast_cli(a->fd, "poll() timed out! This is bad.\n");
} else if (errno != EAGAIN && errno != EINTR) {
ast_cli(a->fd, "poll() returned error: %s\n", strerror(errno));
}
}
ast_timer_close(timer);
timer = NULL;
ast_cli(a->fd, "It has been %" PRIi64 " milliseconds, and we got %d timer ticks\n",
ast_tvdiff_ms(end, start), count);
return CLI_SUCCESS;
}
static struct ast_cli_entry cli_timing[] = {
AST_CLI_DEFINE(timing_test, "Run a timing test"),
};
static void timing_shutdown(void)
{
ast_cli_unregister_multiple(cli_timing, ARRAY_LEN(cli_timing));
ast_heap_destroy(timing_interfaces);
timing_interfaces = NULL;
}
static struct ast_frame *hook_event_cb(struct ast_channel *chan, struct ast_frame *frame, enum ast_framehook_event event, void *data)
{
struct jb_framedata *framedata = data;
struct timeval now_tv;
unsigned long now;
int putframe = 0; /* signifies if audio frame was placed into the buffer or not */
switch (event) {
case AST_FRAMEHOOK_EVENT_READ:
break;
case AST_FRAMEHOOK_EVENT_ATTACHED:
case AST_FRAMEHOOK_EVENT_DETACHED:
case AST_FRAMEHOOK_EVENT_WRITE:
return frame;
}
if (ast_channel_fdno(chan) == AST_JITTERBUFFER_FD && framedata->timer) {
if (ast_timer_ack(framedata->timer, 1) < 0) {
ast_log(LOG_ERROR, "Failed to acknowledge timer in jitter buffer\n");
return frame;
}
}
if (!frame) {
return frame;
}
now_tv = ast_tvnow();
now = ast_tvdiff_ms(now_tv, framedata->start_tv);
if (frame->frametype == AST_FRAME_VOICE) {
int res;
struct ast_frame *jbframe;
if (!ast_test_flag(frame, AST_FRFLAG_HAS_TIMING_INFO) || frame->len < 2 || frame->ts < 0) {
/* only frames with timing info can enter the jitterbuffer */
return frame;
}
jbframe = ast_frisolate(frame);
ao2_replace(framedata->last_format, frame->subclass.format);
if (frame->len && (frame->len != framedata->timer_interval)) {
framedata->timer_interval = frame->len;
ast_timer_set_rate(framedata->timer, 1000 / framedata->timer_interval);
}
if (!framedata->first) {
framedata->first = 1;
res = framedata->jb_impl->put_first(framedata->jb_obj, jbframe, now);
} else {
res = framedata->jb_impl->put(framedata->jb_obj, jbframe, now);
}
if (res == AST_JB_IMPL_OK) {
if (jbframe != frame) {
ast_frfree(frame);
}
frame = &ast_null_frame;
} else if (jbframe != frame) {
ast_frfree(jbframe);
}
putframe = 1;
}
if (frame->frametype == AST_FRAME_NULL) {
int res;
long next = framedata->jb_impl->next(framedata->jb_obj);
/* If now is earlier than the next expected output frame
* from the jitterbuffer we may choose to pass on retrieving
* a frame during this read iteration. The only exception
* to this rule is when an audio frame is placed into the buffer
* and the time for the next frame to come out of the buffer is
* at least within the timer_interval of the next output frame. By
* doing this we are able to feed off the timing of the input frames
* and only rely on our jitterbuffer timer when frames are dropped.
* During testing, this hybrid form of timing gave more reliable results. */
if (now < next) {
long int diff = next - now;
if (!putframe) {
return frame;
} else if (diff >= framedata->timer_interval) {
return frame;
}
}
ast_frfree(frame);
frame = &ast_null_frame;
res = framedata->jb_impl->get(framedata->jb_obj, &frame, now, framedata->timer_interval);
switch (res) {
case AST_JB_IMPL_OK:
/* got it, and pass it through */
break;
case AST_JB_IMPL_DROP:
ast_frfree(frame);
frame = &ast_null_frame;
break;
case AST_JB_IMPL_INTERP:
if (framedata->last_format) {
struct ast_frame tmp = { 0, };
tmp.frametype = AST_FRAME_VOICE;
tmp.subclass.format = framedata->last_format;
/* example: 8000hz / (1000 / 20ms) = 160 samples */
tmp.samples = ast_format_get_sample_rate(framedata->last_format) / (1000 / framedata->timer_interval);
tmp.delivery = ast_tvadd(framedata->start_tv, ast_samp2tv(next, 1000));
tmp.offset = AST_FRIENDLY_OFFSET;
tmp.src = "func_jitterbuffer interpolation";
ast_frfree(frame);
frame = ast_frdup(&tmp);
break;
}
/* else fall through */
case AST_JB_IMPL_NOFRAME:
ast_frfree(frame);
frame = &ast_null_frame;
break;
}
}
if (frame->frametype == AST_FRAME_CONTROL) {
switch(frame->subclass.integer) {
case AST_CONTROL_HOLD:
case AST_CONTROL_UNHOLD:
case AST_CONTROL_T38_PARAMETERS:
case AST_CONTROL_SRCUPDATE:
case AST_CONTROL_SRCCHANGE:
framedata->jb_impl->force_resync(framedata->jb_obj);
break;
default:
break;
}
}
return frame;
}
