/**
* gst_bus_pop_filtered:
* @bus: a #GstBus to pop
* @types: message types to take into account
*
* Get a message matching @type from the bus. Will discard all messages on
* the bus that do not match @type and that have been posted before the first
* message that does match @type. If there is no message matching @type on
* the bus, all messages will be discarded.
*
* Returns: The next #GstMessage matching @type that is on the bus, or NULL if
* the bus is empty or there is no message matching @type.
* The message is taken from the bus and needs to be unreffed with
* gst_message_unref() after usage.
*
* MT safe.
*
* Since: 0.10.15
*/
GstMessage *
gst_bus_pop_filtered (GstBus * bus, GstMessageType types)
{
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
g_return_val_if_fail (types != 0, NULL);
return gst_bus_timed_pop_filtered (bus, 0, types);
}
/**
* gst_bus_get_pollfd:
* @bus: A #GstBus
* @fd: (out): A GPollFD to fill
*
* Gets the file descriptor from the bus which can be used to get notified about
* messages being available with functions like g_poll(), and allows integration
* into other event loops based on file descriptors.
* Whenever a message is available, the POLLIN / %G_IO_IN event is set.
*
* Warning: NEVER read or write anything to the returned fd but only use it
* for getting notifications via g_poll() or similar and then use the normal
* GstBus API, e.g. gst_bus_pop().
*
* Since: 1.14
*/
void
gst_bus_get_pollfd (GstBus * bus, GPollFD * fd)
{
g_return_if_fail (GST_IS_BUS (bus));
g_return_if_fail (bus->priv->poll != NULL);
*fd = bus->priv->pollfd;
}
/**
* gst_bus_enable_sync_message_emission:
* @bus: a #GstBus on which you want to receive the "sync-message" signal
*
* Instructs GStreamer to emit the "sync-message" signal after running the bus's
* sync handler. This function is here so that code can ensure that they can
* synchronously receive messages without having to affect what the bin's sync
* handler is.
*
* This function may be called multiple times. To clean up, the caller is
* responsible for calling gst_bus_disable_sync_message_emission() as many times
* as this function is called.
*
* While this function looks similar to gst_bus_add_signal_watch(), it is not
* exactly the same -- this function enables <emphasis>synchronous</emphasis> emission of
* signals when messages arrive; gst_bus_add_signal_watch() adds an idle callback
* to pop messages off the bus <emphasis>asynchronously</emphasis>. The sync-message signal
* comes from the thread of whatever object posted the message; the "message"
* signal is marshalled to the main thread via the main loop.
*
* MT safe.
*/
void
gst_bus_enable_sync_message_emission (GstBus * bus)
{
g_return_if_fail (GST_IS_BUS (bus));
GST_OBJECT_LOCK (bus);
bus->priv->num_sync_message_emitters++;
GST_OBJECT_UNLOCK (bus);
}
/**
* gst_bus_disable_sync_message_emission:
* @bus: a #GstBus on which you previously called
* gst_bus_enable_sync_message_emission()
*
* Instructs GStreamer to stop emitting the "sync-message" signal for this bus.
* See gst_bus_enable_sync_message_emission() for more information.
*
* In the event that multiple pieces of code have called
* gst_bus_enable_sync_message_emission(), the sync-message emissions will only
* be stopped after all calls to gst_bus_enable_sync_message_emission() were
* "cancelled" by calling this function. In this way the semantics are exactly
* the same as gst_object_ref() that which calls enable should also call
* disable.
*
* MT safe.
*/
void
gst_bus_disable_sync_message_emission (GstBus * bus)
{
g_return_if_fail (GST_IS_BUS (bus));
g_return_if_fail (bus->num_signal_watchers == 0);
GST_OBJECT_LOCK (bus);
bus->priv->num_sync_message_emitters--;
GST_OBJECT_UNLOCK (bus);
}
/**
* gst_bus_have_pending:
* @bus: a #GstBus to check
*
* Check if there are pending messages on the bus that
* should be handled.
*
* Returns: %TRUE if there are messages on the bus to be handled, %FALSE
* otherwise.
*
* MT safe.
*/
gboolean
gst_bus_have_pending (GstBus * bus)
{
gboolean result;
g_return_val_if_fail (GST_IS_BUS (bus), FALSE);
/* see if there is a message on the bus */
result = gst_atomic_queue_length (bus->priv->queue) != 0;
return result;
}
/**
* gst_bus_sync_signal_handler:
* @bus: a #GstBus
* @message: the #GstMessage received
* @data: user data
*
* A helper GstBusSyncHandler that can be used to convert all synchronous
* messages into signals.
*
* Returns: GST_BUS_PASS
*/
GstBusSyncReply
gst_bus_sync_signal_handler (GstBus * bus, GstMessage * message, gpointer data)
{
GQuark detail = 0;
g_return_val_if_fail (GST_IS_BUS (bus), GST_BUS_DROP);
g_return_val_if_fail (message != NULL, GST_BUS_DROP);
detail = gst_message_type_to_quark (GST_MESSAGE_TYPE (message));
g_signal_emit (bus, gst_bus_signals[SYNC_MESSAGE], detail, message);
return GST_BUS_PASS;
}
/**
* gst_bus_add_watch_full:
* @bus: a #GstBus to create the watch for.
* @priority: The priority of the watch.
* @func: A function to call when a message is received.
* @user_data: user data passed to @func.
* @notify: the function to call when the source is removed.
*
* Adds a bus watch to the default main context with the given @priority.
* This function is used to receive asynchronous messages in the main loop.
* There can only be a single bus watch per bus, you must remove it before you
* can set a new one.
*
* When @func is called, the message belongs to the caller; if you want to
* keep a copy of it, call gst_message_ref() before leaving @func.
*
* The watch can be removed using g_source_remove() or by returning FALSE
* from @func.
*
* Returns: The event source id.
*
* MT safe.
*/
guint
gst_bus_add_watch_full (GstBus * bus, gint priority,
GstBusFunc func, gpointer user_data, GDestroyNotify notify)
{
guint id;
g_return_val_if_fail (GST_IS_BUS (bus), 0);
GST_OBJECT_LOCK (bus);
id = gst_bus_add_watch_full_unlocked (bus, priority, func, user_data, notify);
GST_OBJECT_UNLOCK (bus);
return id;
}
/**
* gst_bus_create_watch:
* @bus: a #GstBus to create the watch for
*
* Create watch for this bus. The GSource will be dispatched whenever
* a message is on the bus. After the GSource is dispatched, the
* message is popped off the bus and unreffed.
*
* Returns: A #GSource that can be added to a mainloop.
*/
GSource *
gst_bus_create_watch (GstBus * bus)
{
GstBusSource *source;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
source = (GstBusSource *) g_source_new (&gst_bus_source_funcs,
sizeof (GstBusSource));
source->bus = gst_object_ref (bus);
source->inited = FALSE;
return (GSource *) source;
}
/**
* gst_bus_have_pending:
* @bus: a #GstBus to check
*
* Check if there are pending messages on the bus that
* should be handled.
*
* Returns: TRUE if there are messages on the bus to be handled, FALSE
* otherwise.
*
* MT safe.
*/
gboolean
gst_bus_have_pending (GstBus * bus)
{
gboolean result;
g_return_val_if_fail (GST_IS_BUS (bus), FALSE);
g_mutex_lock (bus->queue_lock);
/* see if there is a message on the bus */
result = !g_queue_is_empty (bus->queue);
g_mutex_unlock (bus->queue_lock);
return result;
}
/**
* gst_bus_async_signal_func:
* @bus: a #GstBus
* @message: the #GstMessage received
* @data: user data
*
* A helper #GstBusFunc that can be used to convert all asynchronous messages
* into signals.
*
* Returns: TRUE
*/
gboolean
gst_bus_async_signal_func (GstBus * bus, GstMessage * message, gpointer data)
{
GQuark detail = 0;
g_return_val_if_fail (GST_IS_BUS (bus), TRUE);
g_return_val_if_fail (message != NULL, TRUE);
detail = gst_message_type_to_quark (GST_MESSAGE_TYPE (message));
g_signal_emit (bus, gst_bus_signals[ASYNC_MESSAGE], detail, message);
/* we never remove this source based on signal emission return values */
return TRUE;
}
/**
* gst_bus_poll:
* @bus: a #GstBus
* @events: a mask of #GstMessageType, representing the set of message types to
* poll for (note special handling of extended message types below)
* @timeout: the poll timeout, as a #GstClockTime, or #GST_CLOCK_TIME_NONE to poll
* indefinitely.
*
* Poll the bus for messages. Will block while waiting for messages to come.
* You can specify a maximum time to poll with the @timeout parameter. If
* @timeout is negative, this function will block indefinitely.
*
* All messages not in @events will be popped off the bus and will be ignored.
* It is not possible to use message enums beyond #GST_MESSAGE_EXTENDED in the
* @events mask
*
* Because poll is implemented using the "message" signal enabled by
* gst_bus_add_signal_watch(), calling gst_bus_poll() will cause the "message"
* signal to be emitted for every message that poll sees. Thus a "message"
* signal handler will see the same messages that this function sees -- neither
* will steal messages from the other.
*
* This function will run a main loop from the default main context when
* polling.
*
* You should never use this function, since it is pure evil. This is
* especially true for GUI applications based on Gtk+ or Qt, but also for any
* other non-trivial application that uses the GLib main loop. As this function
* runs a GLib main loop, any callback attached to the default GLib main
* context may be invoked. This could be timeouts, GUI events, I/O events etc.;
* even if gst_bus_poll() is called with a 0 timeout. Any of these callbacks
* may do things you do not expect, e.g. destroy the main application window or
* some other resource; change other application state; display a dialog and
* run another main loop until the user clicks it away. In short, using this
* function may add a lot of complexity to your code through unexpected
* re-entrancy and unexpected changes to your application's state.
*
* For 0 timeouts use gst_bus_pop_filtered() instead of this function; for
* other short timeouts use gst_bus_timed_pop_filtered(); everything else is
* better handled by setting up an asynchronous bus watch and doing things
* from there.
*
* Returns: (transfer full) (nullable): the message that was received,
* or %NULL if the poll timed out. The message is taken from the
* bus and needs to be unreffed with gst_message_unref() after
* usage.
*/
GstMessage *
gst_bus_poll (GstBus * bus, GstMessageType events, GstClockTime timeout)
{
GstBusPollData *poll_data;
GstMessage *ret;
gulong id;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
poll_data = g_slice_new (GstBusPollData);
poll_data->source_running = TRUE;
poll_data->loop = g_main_loop_new (NULL, FALSE);
poll_data->events = events;
poll_data->message = NULL;
if (timeout != GST_CLOCK_TIME_NONE)
poll_data->timeout_id = g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
timeout / GST_MSECOND, (GSourceFunc) poll_timeout, poll_data,
(GDestroyNotify) poll_destroy_timeout);
else
poll_data->timeout_id = 0;
id = g_signal_connect_data (bus, "message", G_CALLBACK (poll_func), poll_data,
(GClosureNotify) poll_destroy, 0);
/* these can be nested, so it's ok */
gst_bus_add_signal_watch (bus);
GST_DEBUG ("running mainloop %p", poll_data->loop);
g_main_loop_run (poll_data->loop);
GST_DEBUG ("mainloop stopped %p", poll_data->loop);
gst_bus_remove_signal_watch (bus);
/* holds a ref */
ret = poll_data->message;
if (poll_data->timeout_id)
g_source_remove (poll_data->timeout_id);
/* poll_data will be freed now */
g_signal_handler_disconnect (bus, id);
GST_DEBUG_OBJECT (bus, "finished poll with message %p", ret);
return ret;
}
/**
* gst_bus_peek:
* @bus: a #GstBus
*
* Peek the message on the top of the bus' queue. The message will remain
* on the bus' message queue. A reference is returned, and needs to be unreffed
* by the caller.
*
* Returns: The #GstMessage that is on the bus, or NULL if the bus is empty.
*
* MT safe.
*/
GstMessage *
gst_bus_peek (GstBus * bus)
{
GstMessage *message;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
g_mutex_lock (bus->queue_lock);
message = g_queue_peek_head (bus->queue);
if (message)
gst_message_ref (message);
g_mutex_unlock (bus->queue_lock);
GST_DEBUG_OBJECT (bus, "peek on bus, got message %p", message);
return message;
}
/**
* gst_bus_create_watch:
* @bus: a #GstBus to create the watch for
*
* Create watch for this bus. The GSource will be dispatched whenever
* a message is on the bus. After the GSource is dispatched, the
* message is popped off the bus and unreffed.
*
* Returns: (transfer full) (nullable): a #GSource that can be added to a mainloop.
*/
GSource *
gst_bus_create_watch (GstBus * bus)
{
GstBusSource *source;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
g_return_val_if_fail (bus->priv->poll != NULL, NULL);
source = (GstBusSource *) g_source_new (&gst_bus_source_funcs,
sizeof (GstBusSource));
g_source_set_name ((GSource *) source, "GStreamer message bus watch");
source->bus = gst_object_ref (bus);
g_source_add_poll ((GSource *) source, &bus->priv->pollfd);
return (GSource *) source;
}
static gboolean
gst_bus_source_dispatch (GSource * source, GSourceFunc callback,
gpointer user_data)
{
GstBusFunc handler = (GstBusFunc) callback;
GstBusSource *bsource = (GstBusSource *) source;
GstMessage *message;
gboolean keep;
GstBus *bus;
g_return_val_if_fail (bsource != NULL, FALSE);
bus = bsource->bus;
g_return_val_if_fail (GST_IS_BUS (bus), FALSE);
message = gst_bus_pop (bus);
/* The message queue might be empty if some other thread or callback set
* the bus to flushing between check/prepare and dispatch */
if (G_UNLIKELY (message == NULL))
return TRUE;
if (!handler)
goto no_handler;
GST_DEBUG_OBJECT (bus, "source %p calling dispatch with %" GST_PTR_FORMAT,
source, message);
keep = handler (bus, message, user_data);
gst_message_unref (message);
GST_DEBUG_OBJECT (bus, "source %p handler returns %d", source, keep);
return keep;
no_handler:
{
g_warning ("GstBus watch dispatched without callback\n"
"You must call g_source_set_callback().");
gst_message_unref (message);
return FALSE;
}
}
/**
* gst_bus_remove_signal_watch:
* @bus: a #GstBus you previously added a signal watch to
*
* Removes a signal watch previously added with gst_bus_add_signal_watch().
*
* MT safe.
*/
void
gst_bus_remove_signal_watch (GstBus * bus)
{
guint id = 0;
g_return_if_fail (GST_IS_BUS (bus));
/* I know the callees don't take this lock, so go ahead and abuse it */
GST_OBJECT_LOCK (bus);
if (bus->num_signal_watchers == 0)
goto error;
bus->num_signal_watchers--;
if (bus->num_signal_watchers > 0)
goto done;
id = bus->signal_watch_id;
bus->signal_watch_id = 0;
GST_DEBUG_OBJECT (bus, "removing signal watch %u", id);
done:
GST_OBJECT_UNLOCK (bus);
if (id)
g_source_remove (id);
return;
/* ERRORS */
error:
{
g_critical ("Bus %s has no signal watches attached", GST_OBJECT_NAME (bus));
GST_OBJECT_UNLOCK (bus);
return;
}
}
/**
* gst_bus_remove_signal_watch:
* @bus: a #GstBus you previously added a signal watch to
*
* Removes a signal watch previously added with gst_bus_add_signal_watch().
*
* MT safe.
*/
void
gst_bus_remove_signal_watch (GstBus * bus)
{
GSource *source = NULL;
g_return_if_fail (GST_IS_BUS (bus));
/* I know the callees don't take this lock, so go ahead and abuse it */
GST_OBJECT_LOCK (bus);
if (bus->priv->num_signal_watchers == 0)
goto error;
bus->priv->num_signal_watchers--;
if (bus->priv->num_signal_watchers > 0)
goto done;
GST_DEBUG_OBJECT (bus, "removing signal watch %u",
g_source_get_id (bus->priv->signal_watch));
source = bus->priv->signal_watch;
done:
GST_OBJECT_UNLOCK (bus);
if (source)
g_source_destroy (source);
return;
/* ERRORS */
error:
{
g_critical ("Bus %s has no signal watches attached", GST_OBJECT_NAME (bus));
GST_OBJECT_UNLOCK (bus);
return;
}
}
/**
* gst_bus_set_sync_handler:
* @bus: a #GstBus to install the handler on
* @func: (allow-none): The handler function to install
* @user_data: User data that will be sent to the handler function.
* @notify: called when @user_data becomes unused
*
* Sets the synchronous handler on the bus. The function will be called
* every time a new message is posted on the bus. Note that the function
* will be called in the same thread context as the posting object. This
* function is usually only called by the creator of the bus. Applications
* should handle messages asynchronously using the gst_bus watch and poll
* functions.
*
* You cannot replace an existing sync_handler. You can pass %NULL to this
* function, which will clear the existing handler.
*/
void
gst_bus_set_sync_handler (GstBus * bus, GstBusSyncHandler func,
gpointer user_data, GDestroyNotify notify)
{
GDestroyNotify old_notify;
g_return_if_fail (GST_IS_BUS (bus));
GST_OBJECT_LOCK (bus);
/* Assert if the user attempts to replace an existing sync_handler,
* other than to clear it */
if (func != NULL && bus->priv->sync_handler != NULL)
goto no_replace;
if ((old_notify = bus->priv->sync_handler_notify)) {
gpointer old_data = bus->priv->sync_handler_data;
bus->priv->sync_handler_data = NULL;
bus->priv->sync_handler_notify = NULL;
GST_OBJECT_UNLOCK (bus);
old_notify (old_data);
GST_OBJECT_LOCK (bus);
}
bus->priv->sync_handler = func;
bus->priv->sync_handler_data = user_data;
bus->priv->sync_handler_notify = notify;
GST_OBJECT_UNLOCK (bus);
return;
no_replace:
{
GST_OBJECT_UNLOCK (bus);
g_warning ("cannot replace existing sync handler");
return;
}
}
/**
* gst_bus_add_signal_watch_full:
* @bus: a #GstBus on which you want to receive the "message" signal
* @priority: The priority of the watch.
*
* Adds a bus signal watch to the default main context with the given priority.
* After calling this statement, the bus will emit the "message" signal for each
* message posted on the bus when the main loop is running.
*
* This function may be called multiple times. To clean up, the caller is
* responsible for calling gst_bus_remove_signal_watch() as many times as this
* function is called.
*
* There can only be a single bus watch per bus, you most remove all signal watch
* before you can set another type of watch.
*
* MT safe.
*/
void
gst_bus_add_signal_watch_full (GstBus * bus, gint priority)
{
g_return_if_fail (GST_IS_BUS (bus));
/* I know the callees don't take this lock, so go ahead and abuse it */
GST_OBJECT_LOCK (bus);
if (bus->num_signal_watchers > 0)
goto done;
/* this should not fail because the counter above takes care of it */
g_assert (bus->signal_watch_id == 0);
bus->signal_watch_id =
gst_bus_add_watch_full_unlocked (bus, priority, gst_bus_async_signal_func,
NULL, NULL);
if (G_UNLIKELY (bus->signal_watch_id == 0))
goto add_failed;
done:
bus->num_signal_watchers++;
GST_OBJECT_UNLOCK (bus);
return;
/* ERRORS */
add_failed:
{
g_critical ("Could not add signal watch to bus %s", GST_OBJECT_NAME (bus));
GST_OBJECT_UNLOCK (bus);
return;
}
}
/**
* gst_bus_timed_pop_filtered:
* @bus: a #GstBus to pop from
* @timeout: a timeout in nanoseconds, or GST_CLOCK_TIME_NONE to wait forever
* @types: message types to take into account, GST_MESSAGE_ANY for any type
*
* Get a message from the bus whose type matches the message type mask @types,
* waiting up to the specified timeout (and discarding any messages that do not
* match the mask provided).
*
* If @timeout is 0, this function behaves like gst_bus_pop_filtered(). If
* @timeout is #GST_CLOCK_TIME_NONE, this function will block forever until a
* matching message was posted on the bus.
*
* Returns: (transfer full) (nullable): a #GstMessage matching the
* filter in @types, or %NULL if no matching message was found on
* the bus until the timeout expired. The message is taken from
* the bus and needs to be unreffed with gst_message_unref() after
* usage.
*
* MT safe.
*/
GstMessage *
gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
GstMessageType types)
{
GstMessage *message;
GTimeVal now, then;
gboolean first_round = TRUE;
GstClockTime elapsed = 0;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
g_return_val_if_fail (types != 0, NULL);
g_return_val_if_fail (timeout == 0 || bus->priv->poll != NULL, NULL);
g_mutex_lock (&bus->priv->queue_lock);
while (TRUE) {
gint ret;
GST_LOG_OBJECT (bus, "have %d messages",
gst_atomic_queue_length (bus->priv->queue));
while ((message = gst_atomic_queue_pop (bus->priv->queue))) {
if (bus->priv->poll)
gst_poll_read_control (bus->priv->poll);
GST_DEBUG_OBJECT (bus, "got message %p, %s from %s, type mask is %u",
message, GST_MESSAGE_TYPE_NAME (message),
GST_MESSAGE_SRC_NAME (message), (guint) types);
if ((GST_MESSAGE_TYPE (message) & types) != 0) {
/* Extra check to ensure extended types don't get matched unless
* asked for */
if ((!GST_MESSAGE_TYPE_IS_EXTENDED (message))
|| (types & GST_MESSAGE_EXTENDED)) {
/* exit the loop, we have a message */
goto beach;
}
}
GST_DEBUG_OBJECT (bus, "discarding message, does not match mask");
gst_message_unref (message);
message = NULL;
}
/* no need to wait, exit loop */
if (timeout == 0)
break;
else if (timeout != GST_CLOCK_TIME_NONE) {
if (first_round) {
g_get_current_time (&then);
first_round = FALSE;
} else {
g_get_current_time (&now);
elapsed = GST_TIMEVAL_TO_TIME (now) - GST_TIMEVAL_TO_TIME (then);
if (elapsed > timeout)
break;
}
}
/* only here in timeout case */
g_assert (bus->priv->poll);
g_mutex_unlock (&bus->priv->queue_lock);
ret = gst_poll_wait (bus->priv->poll, timeout - elapsed);
g_mutex_lock (&bus->priv->queue_lock);
if (ret == 0) {
GST_INFO_OBJECT (bus, "timed out, breaking loop");
break;
} else {
GST_INFO_OBJECT (bus, "we got woken up, recheck for message");
}
}
beach:
g_mutex_unlock (&bus->priv->queue_lock);
return message;
}
/* FIXME: Copy from owr/orw.c without any error handling whatsoever */
static gboolean bus_call(GstBus *bus, GstMessage *msg, gpointer user_data)
{
gboolean ret, is_warning = FALSE;
GstStateChangeReturn change_status;
gchar *message_type, *debug;
GError *error;
OwrMediaSource *media_source = user_data;
GstElement *pipeline;
g_return_val_if_fail(GST_IS_BUS(bus), TRUE);
(void)user_data;
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_LATENCY:
pipeline = _owr_media_source_get_source_bin(media_source);
g_return_val_if_fail(pipeline, TRUE);
ret = gst_bin_recalculate_latency(GST_BIN(pipeline));
g_warn_if_fail(ret);
g_object_unref(pipeline);
break;
case GST_MESSAGE_CLOCK_LOST:
pipeline = _owr_media_source_get_source_bin(media_source);
g_return_val_if_fail(pipeline, TRUE);
change_status = gst_element_set_state(pipeline, GST_STATE_PAUSED);
g_warn_if_fail(change_status != GST_STATE_CHANGE_FAILURE);
change_status = gst_element_set_state(pipeline, GST_STATE_PLAYING);
g_warn_if_fail(change_status != GST_STATE_CHANGE_FAILURE);
g_object_unref(pipeline);
break;
case GST_MESSAGE_EOS:
g_print("End of stream\n");
break;
case GST_MESSAGE_WARNING:
is_warning = TRUE;
case GST_MESSAGE_ERROR:
if (is_warning) {
message_type = "Warning";
gst_message_parse_warning(msg, &error, &debug);
} else {
message_type = "Error";
gst_message_parse_error(msg, &error, &debug);
}
g_printerr("==== %s message start ====\n", message_type);
g_printerr("%s in element %s.\n", message_type, GST_OBJECT_NAME(msg->src));
g_printerr("%s: %s\n", message_type, error->message);
g_printerr("Debugging info: %s\n", (debug) ? debug : "none");
g_printerr("==== %s message stop ====\n", message_type);
/*GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(pipeline), GST_DEBUG_GRAPH_SHOW_ALL, "pipeline.dot");*/
if (!is_warning) {
OWR_POST_ERROR(media_source, PROCESSING_ERROR, NULL);
}
g_error_free(error);
g_free(debug);
break;
default:
break;
}
return TRUE;
}
/**
* gst_bus_timed_pop_filtered:
* @bus: a #GstBus to pop from
* @timeout: a timeout in nanoseconds, or GST_CLOCK_TIME_NONE to wait forever
* @types: message types to take into account, GST_MESSAGE_ANY for any type
*
* Get a message from the bus whose type matches the message type mask @types,
* waiting up to the specified timeout (and discarding any messages that do not
* match the mask provided).
*
* If @timeout is 0, this function behaves like gst_bus_pop_filtered(). If
* @timeout is #GST_CLOCK_TIME_NONE, this function will block forever until a
* matching message was posted on the bus.
*
* Returns: (transfer full) (nullable): a #GstMessage matching the
* filter in @types, or %NULL if no matching message was found on
* the bus until the timeout expired. The message is taken from
* the bus and needs to be unreffed with gst_message_unref() after
* usage.
*
* MT safe.
*/
GstMessage *
gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
GstMessageType types)
{
GstMessage *message;
GTimeVal now, then;
gboolean first_round = TRUE;
GstClockTime elapsed = 0;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
g_return_val_if_fail (types != 0, NULL);
g_return_val_if_fail (timeout == 0 || bus->priv->poll != NULL, NULL);
g_mutex_lock (&bus->priv->queue_lock);
while (TRUE) {
gint ret;
GST_LOG_OBJECT (bus, "have %d messages",
gst_atomic_queue_length (bus->priv->queue));
while ((message = gst_atomic_queue_pop (bus->priv->queue))) {
if (bus->priv->poll) {
while (!gst_poll_read_control (bus->priv->poll)) {
if (errno == EWOULDBLOCK) {
/* Retry, this can happen if pushing to the queue has finished,
* popping here succeeded but writing control did not finish
* before we got to this line. */
/* Give other threads the chance to do something */
g_thread_yield ();
continue;
} else {
/* This is a real error and means that either the bus is in an
* inconsistent state, or the GstPoll is invalid. GstPoll already
* prints a critical warning about this, no need to do that again
* ourselves */
break;
}
}
}
GST_DEBUG_OBJECT (bus, "got message %p, %s from %s, type mask is %u",
message, GST_MESSAGE_TYPE_NAME (message),
GST_MESSAGE_SRC_NAME (message), (guint) types);
if ((GST_MESSAGE_TYPE (message) & types) != 0) {
/* Extra check to ensure extended types don't get matched unless
* asked for */
if ((!GST_MESSAGE_TYPE_IS_EXTENDED (message))
|| (types & GST_MESSAGE_EXTENDED)) {
/* exit the loop, we have a message */
goto beach;
}
}
GST_DEBUG_OBJECT (bus, "discarding message, does not match mask");
gst_message_unref (message);
message = NULL;
}
/* no need to wait, exit loop */
if (timeout == 0)
break;
else if (timeout != GST_CLOCK_TIME_NONE) {
if (first_round) {
g_get_current_time (&then);
first_round = FALSE;
} else {
g_get_current_time (&now);
elapsed = GST_TIMEVAL_TO_TIME (now) - GST_TIMEVAL_TO_TIME (then);
if (elapsed > timeout)
break;
}
}
/* only here in timeout case */
g_assert (bus->priv->poll);
g_mutex_unlock (&bus->priv->queue_lock);
ret = gst_poll_wait (bus->priv->poll, timeout - elapsed);
g_mutex_lock (&bus->priv->queue_lock);
if (ret == 0) {
GST_INFO_OBJECT (bus, "timed out, breaking loop");
break;
} else {
GST_INFO_OBJECT (bus, "we got woken up, recheck for message");
}
}
beach:
g_mutex_unlock (&bus->priv->queue_lock);
return message;
}
/**
* gst_bus_post:
* @bus: a #GstBus to post on
* @message: (transfer full): the #GstMessage to post
*
* Post a message on the given bus. Ownership of the message
* is taken by the bus.
*
* Returns: %TRUE if the message could be posted, %FALSE if the bus is flushing.
*
* MT safe.
*/
gboolean
gst_bus_post (GstBus * bus, GstMessage * message)
{
GstBusSyncReply reply = GST_BUS_PASS;
GstBusSyncHandler handler;
gboolean emit_sync_message;
gpointer handler_data;
g_return_val_if_fail (GST_IS_BUS (bus), FALSE);
g_return_val_if_fail (GST_IS_MESSAGE (message), FALSE);
GST_DEBUG_OBJECT (bus, "[msg %p] posting on bus %" GST_PTR_FORMAT, message,
message);
/* check we didn't accidentally add a public flag that maps to same value */
g_assert (!GST_MINI_OBJECT_FLAG_IS_SET (message,
GST_MESSAGE_FLAG_ASYNC_DELIVERY));
GST_OBJECT_LOCK (bus);
/* check if the bus is flushing */
if (GST_OBJECT_FLAG_IS_SET (bus, GST_BUS_FLUSHING))
goto is_flushing;
handler = bus->priv->sync_handler;
handler_data = bus->priv->sync_handler_data;
emit_sync_message = bus->priv->num_sync_message_emitters > 0;
GST_OBJECT_UNLOCK (bus);
/* first call the sync handler if it is installed */
if (handler)
reply = handler (bus, message, handler_data);
/* emit sync-message if requested to do so via
gst_bus_enable_sync_message_emission. terrible but effective */
if (emit_sync_message && reply != GST_BUS_DROP
&& handler != gst_bus_sync_signal_handler)
gst_bus_sync_signal_handler (bus, message, NULL);
/* If this is a bus without async message delivery
* always drop the message */
if (!bus->priv->poll)
reply = GST_BUS_DROP;
/* now see what we should do with the message */
switch (reply) {
case GST_BUS_DROP:
/* drop the message */
GST_DEBUG_OBJECT (bus, "[msg %p] dropped", message);
break;
case GST_BUS_PASS:
/* pass the message to the async queue, refcount passed in the queue */
GST_DEBUG_OBJECT (bus, "[msg %p] pushing on async queue", message);
gst_atomic_queue_push (bus->priv->queue, message);
gst_poll_write_control (bus->priv->poll);
GST_DEBUG_OBJECT (bus, "[msg %p] pushed on async queue", message);
break;
case GST_BUS_ASYNC:
{
/* async delivery, we need a mutex and a cond to block
* on */
GCond *cond = GST_MESSAGE_GET_COND (message);
GMutex *lock = GST_MESSAGE_GET_LOCK (message);
g_cond_init (cond);
g_mutex_init (lock);
GST_MINI_OBJECT_FLAG_SET (message, GST_MESSAGE_FLAG_ASYNC_DELIVERY);
GST_DEBUG_OBJECT (bus, "[msg %p] waiting for async delivery", message);
/* now we lock the message mutex, send the message to the async
* queue. When the message is handled by the app and destroyed,
* the cond will be signalled and we can continue */
g_mutex_lock (lock);
gst_atomic_queue_push (bus->priv->queue, message);
gst_poll_write_control (bus->priv->poll);
/* now block till the message is freed */
g_cond_wait (cond, lock);
/* we acquired a new ref from gst_message_dispose() so we can clean up */
g_mutex_unlock (lock);
GST_DEBUG_OBJECT (bus, "[msg %p] delivered asynchronously", message);
GST_MINI_OBJECT_FLAG_UNSET (message, GST_MESSAGE_FLAG_ASYNC_DELIVERY);
g_mutex_clear (lock);
g_cond_clear (cond);
gst_message_unref (message);
break;
}
default:
g_warning ("invalid return from bus sync handler");
break;
}
return TRUE;
/* ERRORS */
is_flushing:
{
GST_DEBUG_OBJECT (bus, "bus is flushing");
GST_OBJECT_UNLOCK (bus);
gst_message_unref (message);
return FALSE;
}
}
/**
* gst_bus_timed_pop_filtered:
* @bus: a #GstBus to pop from
* @timeout: a timeout in nanoseconds, or GST_CLOCK_TIME_NONE to wait forever
* @types: message types to take into account, GST_MESSAGE_ANY for any type
*
* Get a message from the bus whose type matches the message type mask @types,
* waiting up to the specified timeout (and discarding any messages that do not
* match the mask provided).
*
* If @timeout is 0, this function behaves like gst_bus_pop_filtered(). If
* @timeout is #GST_CLOCK_TIME_NONE, this function will block forever until a
* matching message was posted on the bus.
*
* Returns: a #GstMessage matching the filter in @types, or NULL if no matching
* message was found on the bus until the timeout expired.
* The message is taken from the bus and needs to be unreffed with
* gst_message_unref() after usage.
*
* MT safe.
*
* Since: 0.10.15
*/
GstMessage *
gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
GstMessageType types)
{
GstMessage *message;
GTimeVal *timeval, abstimeout;
gboolean first_round = TRUE;
g_return_val_if_fail (GST_IS_BUS (bus), NULL);
g_return_val_if_fail (types != 0, NULL);
g_mutex_lock (bus->queue_lock);
while (TRUE) {
GST_LOG_OBJECT (bus, "have %d messages", g_queue_get_length (bus->queue));
while ((message = g_queue_pop_head (bus->queue))) {
GST_DEBUG_OBJECT (bus, "got message %p, %s, type mask is %u",
message, GST_MESSAGE_TYPE_NAME (message), (guint) types);
if ((GST_MESSAGE_TYPE (message) & types) != 0) {
/* exit the loop, we have a message */
goto beach;
} else {
GST_DEBUG_OBJECT (bus, "discarding message, does not match mask");
gst_message_unref (message);
message = NULL;
}
}
/* no need to wait, exit loop */
if (timeout == 0)
break;
if (timeout == GST_CLOCK_TIME_NONE) {
/* wait forever */
timeval = NULL;
} else if (first_round) {
glong add = timeout / 1000;
if (add == 0)
/* no need to wait */
break;
/* make timeout absolute */
g_get_current_time (&abstimeout);
g_time_val_add (&abstimeout, add);
timeval = &abstimeout;
first_round = FALSE;
GST_DEBUG_OBJECT (bus, "blocking for message, timeout %ld", add);
} else {
/* calculated the absolute end time already, no need to do it again */
GST_DEBUG_OBJECT (bus, "blocking for message, again");
timeval = &abstimeout; /* fool compiler */
}
if (!g_cond_timed_wait (bus->priv->queue_cond, bus->queue_lock, timeval)) {
GST_INFO_OBJECT (bus, "timed out, breaking loop");
break;
} else {
GST_INFO_OBJECT (bus, "we got woken up, recheck for message");
}
}
beach:
g_mutex_unlock (bus->queue_lock);
return message;
}
/**
* gst_bus_post:
* @bus: a #GstBus to post on
* @message: The #GstMessage to post
*
* Post a message on the given bus. Ownership of the message
* is taken by the bus.
*
* Returns: TRUE if the message could be posted, FALSE if the bus is flushing.
*
* MT safe.
*/
gboolean
gst_bus_post (GstBus * bus, GstMessage * message)
{
GstBusSyncReply reply = GST_BUS_PASS;
GstBusSyncHandler handler;
gboolean emit_sync_message;
gpointer handler_data;
g_return_val_if_fail (GST_IS_BUS (bus), FALSE);
g_return_val_if_fail (GST_IS_MESSAGE (message), FALSE);
GST_DEBUG_OBJECT (bus, "[msg %p] posting on bus, type %s, %" GST_PTR_FORMAT
" from source %" GST_PTR_FORMAT,
message, GST_MESSAGE_TYPE_NAME (message), message->structure,
message->src);
GST_OBJECT_LOCK (bus);
/* check if the bus is flushing */
if (GST_OBJECT_FLAG_IS_SET (bus, GST_BUS_FLUSHING))
goto is_flushing;
handler = bus->sync_handler;
handler_data = bus->sync_handler_data;
emit_sync_message = bus->priv->num_sync_message_emitters > 0;
GST_OBJECT_UNLOCK (bus);
/* first call the sync handler if it is installed */
if (handler)
reply = handler (bus, message, handler_data);
/* emit sync-message if requested to do so via
gst_bus_enable_sync_message_emission. terrible but effective */
if (emit_sync_message && reply != GST_BUS_DROP
&& handler != gst_bus_sync_signal_handler)
gst_bus_sync_signal_handler (bus, message, NULL);
/* now see what we should do with the message */
switch (reply) {
case GST_BUS_DROP:
/* drop the message */
GST_DEBUG_OBJECT (bus, "[msg %p] dropped", message);
break;
case GST_BUS_PASS:
/* pass the message to the async queue, refcount passed in the queue */
GST_DEBUG_OBJECT (bus, "[msg %p] pushing on async queue", message);
g_mutex_lock (bus->queue_lock);
g_queue_push_tail (bus->queue, message);
g_cond_broadcast (bus->priv->queue_cond);
g_mutex_unlock (bus->queue_lock);
GST_DEBUG_OBJECT (bus, "[msg %p] pushed on async queue", message);
gst_bus_wakeup_main_context (bus);
break;
case GST_BUS_ASYNC:
{
/* async delivery, we need a mutex and a cond to block
* on */
GMutex *lock = g_mutex_new ();
GCond *cond = g_cond_new ();
GST_MESSAGE_COND (message) = cond;
GST_MESSAGE_GET_LOCK (message) = lock;
GST_DEBUG_OBJECT (bus, "[msg %p] waiting for async delivery", message);
/* now we lock the message mutex, send the message to the async
* queue. When the message is handled by the app and destroyed,
* the cond will be signalled and we can continue */
g_mutex_lock (lock);
g_mutex_lock (bus->queue_lock);
g_queue_push_tail (bus->queue, message);
g_cond_broadcast (bus->priv->queue_cond);
g_mutex_unlock (bus->queue_lock);
gst_bus_wakeup_main_context (bus);
/* now block till the message is freed */
g_cond_wait (cond, lock);
g_mutex_unlock (lock);
GST_DEBUG_OBJECT (bus, "[msg %p] delivered asynchronously", message);
g_mutex_free (lock);
g_cond_free (cond);
break;
}
default:
g_warning ("invalid return from bus sync handler");
break;
}
return TRUE;
/* ERRORS */
is_flushing:
{
GST_DEBUG_OBJECT (bus, "bus is flushing");
gst_message_unref (message);
GST_OBJECT_UNLOCK (bus);
return FALSE;
}
}
