mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-26 10:10:32 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/plugins/elements/gstqueue.c
Ronald S. Bultje 9111ea764c Fix a deadlock that happens if the next element sends an event and the previous element sends a buffer where the queu... 
Original commit message from CVS:
Fix a deadlock that happens if the next element sends an event and the previous element sends a buffer where the queue is full. See the comment in the code for the rest.
2003-12-14 13:14:35 +00:00

996 lines
32 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2003 Colin Walters <cwalters@gnome.org>
*
* gstqueue.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gst_private.h"
#include "gstqueue.h"
#include "gstscheduler.h"
#include "gstevent.h"
#include "gstinfo.h"
static GstElementDetails gst_queue_details = GST_ELEMENT_DETAILS (
"Queue",
"Generic",
"Simple data queue",
"Erik Walthinsen <omega@cse.ogi.edu>"
);
/* Queue signals and args */
enum {
SIGNAL_UNDERRUN,
SIGNAL_RUNNING,
SIGNAL_OVERRUN,
LAST_SIGNAL
};
enum {
ARG_0,
/* FIXME: don't we have another way of doing this
* "Gstreamer format" (frame/byte/time) queries? */
ARG_CUR_LEVEL_BUFFERS,
ARG_CUR_LEVEL_BYTES,
ARG_CUR_LEVEL_TIME,
ARG_MAX_SIZE_BUFFERS,
ARG_MAX_SIZE_BYTES,
ARG_MAX_SIZE_TIME,
ARG_MIN_TRESHOLD_BUFFERS,
ARG_MIN_TRESHOLD_BYTES,
ARG_MIN_TRESHOLD_TIME,
ARG_LEAKY,
ARG_MAY_DEADLOCK,
ARG_BLOCK_TIMEOUT
/* FILL ME */
};
typedef struct _GstQueueEventResponse {
GstEvent *event;
gboolean ret, handled;
} GstQueueEventResponse;
static void gst_queue_base_init (GstQueueClass *klass);
static void gst_queue_class_init (GstQueueClass *klass);
static void gst_queue_init (GstQueue *queue);
static void gst_queue_dispose (GObject *object);
static void gst_queue_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_queue_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static GstCaps *gst_queue_getcaps (GstPad *pad,
GstCaps *caps);
static GstPadLinkReturn
gst_queue_link (GstPad *pad,
GstCaps *caps);
static void gst_queue_chain (GstPad *pad,
GstData *data);
static GstData *gst_queue_get (GstPad *pad);
static GstBufferPool *
gst_queue_get_bufferpool (GstPad *pad);
static gboolean gst_queue_handle_src_event (GstPad *pad,
GstEvent *event);
static void gst_queue_locked_flush (GstQueue *queue);
static GstElementStateReturn
gst_queue_change_state (GstElement *element);
static gboolean gst_queue_release_locks (GstElement *element);
#define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type ())
static GType
queue_leaky_get_type (void)
{
static GType queue_leaky_type = 0;
static GEnumValue queue_leaky[] = {
{ GST_QUEUE_NO_LEAK, "0", "Not Leaky" },
{ GST_QUEUE_LEAK_UPSTREAM, "1", "Leaky on Upstream" },
{ GST_QUEUE_LEAK_DOWNSTREAM, "2", "Leaky on Downstream" },
{ 0, NULL, NULL },
};
if (!queue_leaky_type) {
queue_leaky_type = g_enum_register_static("GstQueueLeaky", queue_leaky);
}
return queue_leaky_type;
}
static GstElementClass *parent_class = NULL;
static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
GType
gst_queue_get_type (void)
{
static GType queue_type = 0;
if (!queue_type) {
static const GTypeInfo queue_info = {
sizeof (GstQueueClass),
(GBaseInitFunc) gst_queue_base_init,
NULL,
(GClassInitFunc) gst_queue_class_init,
NULL,
NULL,
sizeof (GstQueue),
4,
(GInstanceInitFunc) gst_queue_init,
NULL
};
queue_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstQueue", &queue_info, 0);
}
return queue_type;
}
static void
gst_queue_base_init (GstQueueClass *klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (gstelement_class, &gst_queue_details);
}
static void
gst_queue_class_init (GstQueueClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
/* signals */
gst_queue_signals[SIGNAL_UNDERRUN] =
g_signal_new ("underrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstQueueClass, underrun), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_queue_signals[SIGNAL_RUNNING] =
g_signal_new ("running", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstQueueClass, running), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_queue_signals[SIGNAL_OVERRUN] =
g_signal_new ("overrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstQueueClass, overrun), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
/* properties */
g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BYTES,
g_param_spec_uint ("current-level-bytes", "Current level (kB)",
"Current amount of data in the queue (bytes)",
0, G_MAXUINT, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BUFFERS,
g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
"Current number of buffers in the queue",
0, G_MAXUINT, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_TIME,
g_param_spec_uint64 ("current-level-time", "Current level (ns)",
"Current amount of data in the queue (in ns)",
0, G_MAXUINT64, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BYTES,
g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
"Max. amount of data in the queue (bytes, 0=disable)",
0, G_MAXUINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BUFFERS,
g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
"Max. number of buffers in the queue (0=disable)",
0, G_MAXUINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MAX_SIZE_TIME,
g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
"Max. amount of data in the queue (in ns, 0=disable)",
0, G_MAXUINT64, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MIN_TRESHOLD_BYTES,
g_param_spec_uint ("min-treshold-bytes", "Min. treshold (kB)",
"Min. amount of data in the queue to allow reading (bytes, 0=disable)",
0, G_MAXUINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MIN_TRESHOLD_BUFFERS,
g_param_spec_uint ("min-treshold-buffers", "Min. treshold (buffers)",
"Min. number of buffers in the queue to allow reading (0=disable)",
0, G_MAXUINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MIN_TRESHOLD_TIME,
g_param_spec_uint64 ("min-treshold-time", "Min. treshold (ns)",
"Min. amount of data in the queue to allow reading (in ns, 0=disable)",
0, G_MAXUINT64, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_LEAKY,
g_param_spec_enum ("leaky", "Leaky",
"Where the queue leaks, if at all",
GST_TYPE_QUEUE_LEAKY, GST_QUEUE_NO_LEAK, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MAY_DEADLOCK,
g_param_spec_boolean ("may_deadlock", "May Deadlock",
"The queue may deadlock if it's full and not PLAYING",
TRUE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_BLOCK_TIMEOUT,
g_param_spec_uint64 ("block_timeout", "Timeout for Block",
"Nanoseconds until blocked queue times out and returns filler event. "
"Value of -1 disables timeout",
0, G_MAXUINT64, -1, G_PARAM_READWRITE));
/* set several parent class virtual functions */
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_queue_dispose);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
gstelement_class->release_locks = GST_DEBUG_FUNCPTR (gst_queue_release_locks);
}
static void
gst_queue_init (GstQueue *queue)
{
/* scheduling on this kind of element is, well, interesting */
GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
GST_FLAG_SET (queue, GST_ELEMENT_EVENT_AWARE);
queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_chain));
gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
gst_pad_set_bufferpool_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_get_bufferpool));
gst_pad_set_link_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_link));
gst_pad_set_getcaps_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_getcaps));
gst_pad_set_active (queue->sinkpad, TRUE);
queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_get));
gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
gst_pad_set_link_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_link));
gst_pad_set_getcaps_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_getcaps));
gst_pad_set_event_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_handle_src_event));
gst_pad_set_active (queue->srcpad, TRUE);
queue->cur_level.buffers = 0; /* no content */
queue->cur_level.bytes = 0; /* no content */
queue->cur_level.time = 0; /* no content */
queue->max_size.buffers = 100; /* max. 100 buffers */
queue->max_size.bytes = 1024 * 1024; /* max. 1 MB */
queue->max_size.time = GST_SECOND; /* max. 1 sec. */
queue->min_treshold.buffers = 0; /* no treshold */
queue->min_treshold.bytes = 0; /* no treshold */
queue->min_treshold.time = 0; /* no treshold */
queue->leaky = GST_QUEUE_NO_LEAK;
queue->may_deadlock = TRUE;
queue->block_timeout = GST_CLOCK_TIME_NONE;
queue->interrupt = FALSE;
queue->flush = FALSE;
queue->qlock = g_mutex_new ();
queue->item_add = g_cond_new ();
queue->item_del = g_cond_new ();
queue->event_done = g_cond_new ();
queue->events = g_queue_new ();
queue->queue = g_queue_new ();
GST_CAT_DEBUG_OBJECT (GST_CAT_THREAD, queue,
"initialized queue's not_empty & not_full conditions");
}
static void
gst_queue_dispose (GObject *object)
{
GstQueue *queue = GST_QUEUE (object);
gst_element_set_state (GST_ELEMENT (queue), GST_STATE_NULL);
while (!g_queue_is_empty (queue->queue)) {
GstData *data = g_queue_pop_head (queue->queue);
gst_data_unref (data);
}
g_queue_free (queue->queue);
g_mutex_free (queue->qlock);
g_cond_free (queue->item_add);
g_cond_free (queue->item_del);
g_cond_free (queue->event_done);
while (!g_queue_is_empty (queue->events)) {
GstEvent *event = g_queue_pop_head (queue->events);
gst_event_unref (event);
}
if (G_OBJECT_CLASS (parent_class)->dispose)
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static GstPad *
gst_queue_otherpad (GstPad *pad)
{
GstQueue *queue = GST_QUEUE (gst_pad_get_parent (pad));
GstPad *otherpad;
if (pad == queue->srcpad)
otherpad = queue->sinkpad;
else
otherpad = queue->srcpad;
return otherpad;
}
static GstPadLinkReturn
gst_queue_link (GstPad *pad,
GstCaps *caps)
{
return gst_pad_proxy_link (gst_queue_otherpad (pad), caps);
}
static GstCaps *
gst_queue_getcaps (GstPad *pad,
GstCaps *caps)
{
GstPad *otherpad = GST_PAD_PEER (gst_queue_otherpad (pad));
if (otherpad)
return gst_pad_get_caps (otherpad);
return NULL;
}
static GstBufferPool *
gst_queue_get_bufferpool (GstPad *pad)
{
return gst_pad_get_bufferpool (gst_queue_otherpad (pad));
}
static void
gst_queue_locked_flush (GstQueue *queue)
{
while (!g_queue_is_empty (queue->queue)) {
GstData *data = g_queue_pop_head (queue->queue);
gst_data_unref (data);
}
queue->timeval = NULL;
queue->cur_level.buffers = 0;
queue->cur_level.bytes = 0;
queue->cur_level.time = 0;
/* make sure any pending buffers to be added are flushed too */
queue->flush = TRUE;
/* we deleted something... */
g_cond_signal (queue->item_del);
}
static void
gst_queue_handle_pending_events (GstQueue *queue)
{
/* check for events to send upstream */
while (!g_queue_is_empty (queue->events)){
GstQueueEventResponse *er = g_queue_pop_head (queue->events);
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "sending event upstream");
er->ret = gst_pad_event_default (GST_PAD_PEER (queue->sinkpad), er->event);
er->handled = TRUE;
g_cond_signal (queue->event_done);
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "event sent");
}
}
#define STATUS(queue, msg) \
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, \
"(%s:%s) " msg ": %u of %u-%u buffers, %u of %u-%u " \
"bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
"-%" G_GUINT64_FORMAT " ns, %u elements", \
GST_DEBUG_PAD_NAME (pad), \
queue->cur_level.buffers, \
queue->min_treshold.buffers, \
queue->max_size.buffers, \
queue->cur_level.bytes, \
queue->min_treshold.bytes, \
queue->max_size.bytes, \
queue->cur_level.time, \
queue->min_treshold.time, \
queue->max_size.time, \
queue->queue->length)
static void
gst_queue_chain (GstPad *pad,
GstData *data)
{
GstQueue *queue;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (data != NULL);
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
restart:
/* we have to lock the queue since we span threads */
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "locking t:%p", g_thread_self ());
g_mutex_lock (queue->qlock);
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "locked t:%p", g_thread_self ());
gst_queue_handle_pending_events (queue);
/* assume don't need to flush this buffer when the queue is filled */
queue->flush = FALSE;
if (GST_IS_EVENT (data)) {
switch (GST_EVENT_TYPE (data)) {
case GST_EVENT_FLUSH:
STATUS (queue, "received flush event");
gst_queue_locked_flush (queue);
break;
case GST_EVENT_EOS:
STATUS (queue, "received EOS");
break;
default:
/* we put the event in the queue, we don't have to act ourselves */
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
"adding event %p of type %d",
data, GST_EVENT_TYPE (data));
break;
}
}
if (GST_IS_BUFFER (data))
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
"adding buffer %p of size %d",
data, GST_BUFFER_SIZE (data));
/* We make space available if we're "full" according to whatever
* the user defined as "full". Note that this only applies to buffers.
* We always handle events and they don't count in our statistics. */
if (GST_IS_BUFFER (data) &&
((queue->max_size.buffers > 0 &&
queue->cur_level.buffers >= queue->max_size.buffers) ||
(queue->max_size.bytes > 0 &&
queue->cur_level.bytes >= queue->max_size.bytes) ||
(queue->max_size.time > 0 &&
queue->cur_level.time >= queue->max_size.time))) {
g_mutex_unlock (queue->qlock);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_OVERRUN], 0);
g_mutex_lock (queue->qlock);
/* how are we going to make space for this buffer? */
switch (queue->leaky) {
/* leak current buffer */
case GST_QUEUE_LEAK_UPSTREAM:
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
"queue is full, leaking buffer on upstream end");
/* now we can clean up and exit right away */
g_mutex_unlock (queue->qlock);
goto out_unref;
/* leak first buffer in the queue */
case GST_QUEUE_LEAK_DOWNSTREAM: {
/* this is a bit hacky. We'll manually iterate the list
* and find the first buffer from the head on. We'll
* unref that and "fix up" the GQueue object... */
GList *item;
GstData *leak = NULL;
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
"queue is full, leaking buffer on downstream end");
for (item = queue->queue->head; item != NULL; item = item->next) {
if (GST_IS_BUFFER (item->data)) {
leak = item->data;
break;
}
}
/* if we didn't find anything, it means we have no buffers
* in here. That cannot happen, since we had >= 1 bufs */
g_assert (leak);
/* Now remove it from the list, fixing up the GQueue
* CHECKME: is a queue->head the first or the last item? */
item = g_list_delete_link (queue->queue->head, item);
queue->queue->head = g_list_first (item);
queue->queue->tail = g_list_last (item);
queue->queue->length--;
/* and unref the data at the end. Twice, because we keep a ref
* to make things read-only. Also keep our list uptodate. */
queue->cur_level.bytes -= GST_BUFFER_SIZE (data);
queue->cur_level.buffers --;
if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
queue->cur_level.time -= GST_BUFFER_DURATION (data);
gst_data_unref (data);
gst_data_unref (data);
break;
}
default:
g_warning ("Unknown leaky type, using default");
/* fall-through */
/* don't leak. Instead, wait for space to be available */
case GST_QUEUE_NO_LEAK:
STATUS (queue, "pre-full wait");
while ((queue->max_size.buffers > 0 &&
queue->cur_level.buffers >= queue->max_size.buffers) ||
(queue->max_size.bytes > 0 &&
queue->cur_level.bytes >= queue->max_size.bytes) ||
(queue->max_size.time > 0 &&
queue->cur_level.time >= queue->max_size.time)) {
/* if there's a pending state change for this queue
* or its manager, switch back to iterator so bottom
* half of state change executes */
if (queue->interrupt) {
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "interrupted");
g_mutex_unlock (queue->qlock);
if (gst_scheduler_interrupt (gst_pad_get_scheduler (queue->sinkpad),
GST_ELEMENT (queue))) {
goto out_unref;
}
/* if we got here because we were unlocked after a
* flush, we don't need to add the buffer to the
* queue again */
if (queue->flush) {
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
"not adding pending buffer after flush");
goto out_unref;
}
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
"adding pending buffer after interrupt");
goto restart;
}
if (GST_STATE (queue) != GST_STATE_PLAYING) {
/* this means the other end is shut down. Try to
* signal to resolve the error */
if (!queue->may_deadlock) {
g_mutex_unlock (queue->qlock);
gst_data_unref (data);
gst_element_error (GST_ELEMENT (queue),
"deadlock found, source pad elements are shut down");
/* we don't go to out_unref here, since we want to
* unref the buffer *before* calling gst_element_error */
return;
} else {
GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
"%s: waiting for the app to restart "
"source pad elements",
GST_ELEMENT_NAME (queue));
}
}
/* OK, we've got a serious issue here. Imagine the situation
* where the puller (next element) is sending an event here,
* so it cannot pull events from the queue, and we cannot
* push data further because the queue is 'full' and therefore,
* we wait here (and do not handle events): deadlock! to solve
* that, we handle pending upstream events here, too. */
gst_queue_handle_pending_events (queue);
STATUS (queue, "waiting for item_del signal");
g_cond_wait (queue->item_del, queue->qlock);
STATUS (queue, "received item_del signal");
}
STATUS (queue, "post-full wait");
g_mutex_unlock (queue->qlock);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
g_mutex_lock (queue->qlock);
break;
}
}
/* put the buffer on the tail of the list. We keep a reference,
* so that the data is read-only while in here. There's a good
* reason to do so: we have a size and time counter, and any
* modification to the content could change any of the two. */
gst_data_ref (data);
g_queue_push_tail (queue->queue, data);
/* Note that we only add buffers (not events) to the statistics */
if (GST_IS_BUFFER (data)) {
queue->cur_level.buffers++;
queue->cur_level.bytes += GST_BUFFER_SIZE (data);
if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
queue->cur_level.time += GST_BUFFER_DURATION (data);
}
STATUS (queue, "+ level");
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "signalling item_add");
g_cond_signal (queue->item_add);
g_mutex_unlock (queue->qlock);
return;
out_unref:
gst_data_unref (data);
return;
}
static GstData *
gst_queue_get (GstPad *pad)
{
GstQueue *queue;
GstData *data;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
queue = GST_QUEUE (gst_pad_get_parent (pad));
restart:
/* have to lock for thread-safety */
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
"locking t:%p", g_thread_self ());
g_mutex_lock (queue->qlock);
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
"locked t:%p", g_thread_self ());
if (queue->queue->length == 0 ||
(queue->min_treshold.buffers > 0 &&
queue->cur_level.buffers < queue->min_treshold.buffers) ||
(queue->min_treshold.bytes > 0 &&
queue->cur_level.bytes < queue->min_treshold.bytes) ||
(queue->min_treshold.time > 0 &&
queue->cur_level.time < queue->min_treshold.time)) {
g_mutex_unlock (queue->qlock);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_UNDERRUN], 0);
g_mutex_lock (queue->qlock);
STATUS (queue, "pre-empty wait");
while (queue->queue->length == 0 ||
(queue->min_treshold.buffers > 0 &&
queue->cur_level.buffers < queue->min_treshold.buffers) ||
(queue->min_treshold.bytes > 0 &&
queue->cur_level.bytes < queue->min_treshold.bytes) ||
(queue->min_treshold.time > 0 &&
queue->cur_level.time < queue->min_treshold.time)) {
/* if there's a pending state change for this queue or its
* manager, switch back to iterator so bottom half of state
* change executes. */
if (queue->interrupt) {
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "interrupted");
g_mutex_unlock (queue->qlock);
if (gst_scheduler_interrupt (gst_pad_get_scheduler (queue->srcpad),
GST_ELEMENT (queue)))
return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
goto restart;
}
if (GST_STATE (queue) != GST_STATE_PLAYING) {
/* this means the other end is shut down */
if (!queue->may_deadlock) {
g_mutex_unlock (queue->qlock);
gst_element_error (GST_ELEMENT (queue),
"deadlock found, sink pad elements are shut down");
goto restart;
} else {
GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
"%s: waiting for the app to restart "
"source pad elements",
GST_ELEMENT_NAME (queue));
}
}
STATUS (queue, "waiting for item_add");
if (queue->block_timeout != GST_CLOCK_TIME_NONE) {
GTimeVal timeout;
g_get_current_time (&timeout);
g_time_val_add (&timeout, queue->block_timeout / 1000);
if (!g_cond_timed_wait (queue->item_add, queue->qlock, &timeout)){
g_mutex_unlock (queue->qlock);
GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
"Sending filler event");
return GST_DATA (gst_event_new_filler ());
}
} else {
g_cond_wait (queue->item_add, queue->qlock);
}
STATUS (queue, "got item_add signal");
}
STATUS (queue, "post-empty wait");
g_mutex_unlock (queue->qlock);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
g_mutex_lock (queue->qlock);
}
/* There's something in the list now, whatever it is */
data = g_queue_pop_head (queue->queue);
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
"retrieved data %p from queue", data);
if (GST_IS_BUFFER (data)) {
/* Update statistics */
queue->cur_level.buffers--;
queue->cur_level.bytes -= GST_BUFFER_SIZE (data);
if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
queue->cur_level.time -= GST_BUFFER_DURATION (data);
}
/* Now that we're done, we can lose our own reference to
* the item, since we're no longer in danger. */
gst_data_unref (data);
STATUS (queue, "after _get()");
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "signalling item_del");
g_cond_signal (queue->item_del);
g_mutex_unlock (queue->qlock);
/* FIXME: I suppose this needs to be locked, since the EOS
* bit affects the pipeline state. However, that bit is
* locked too so it'd cause a deadlock. */
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
"queue \"%s\" eos",
GST_ELEMENT_NAME (queue));
gst_element_set_eos (GST_ELEMENT (queue));
break;
default:
break;
}
}
return data;
}
static gboolean
gst_queue_handle_src_event (GstPad *pad,
GstEvent *event)
{
GstQueue *queue = GST_QUEUE (gst_pad_get_parent (pad));
gboolean res;
g_mutex_lock (queue->qlock);
if (gst_element_get_state (GST_ELEMENT (queue)) == GST_STATE_PLAYING) {
GstQueueEventResponse er;
/* push the event to the queue and wait for upstream consumption */
er.event = event;
er.handled = FALSE;
g_queue_push_tail (queue->events, &er);
GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
"Preparing for loop for event handler");
/* see the chain function on why this is here - it prevents a deadlock */
g_cond_signal (queue->item_del);
while (!er.handled) {
g_cond_wait (queue->event_done, queue->qlock);
}
GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
"Event handled");
res = er.ret;
} else {
res = gst_pad_event_default (pad, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH:
GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
"FLUSH event, flushing queue\n");
gst_queue_locked_flush (queue);
break;
case GST_EVENT_SEEK:
if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH) {
gst_queue_locked_flush (queue);
}
default:
break;
}
}
g_mutex_unlock (queue->qlock);
/* we have to claim success, but we don't really know */
return res;
}
static gboolean
gst_queue_release_locks (GstElement *element)
{
GstQueue *queue;
queue = GST_QUEUE (element);
g_mutex_lock (queue->qlock);
queue->interrupt = TRUE;
g_cond_signal (queue->item_add);
g_cond_signal (queue->item_del);
g_mutex_unlock (queue->qlock);
return TRUE;
}
static GstElementStateReturn
gst_queue_change_state (GstElement *element)
{
GstQueue *queue;
GstElementStateReturn ret = GST_STATE_SUCCESS;
queue = GST_QUEUE (element);
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "starting state change");
/* lock the queue so another thread (not in sync with this thread's state)
* can't call this queue's _get (or whatever)
*/
g_mutex_lock (queue->qlock);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
gst_queue_locked_flush (queue);
break;
case GST_STATE_PAUSED_TO_PLAYING:
if (!GST_PAD_IS_LINKED (queue->sinkpad)) {
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, queue,
"queue %s is not linked",
GST_ELEMENT_NAME (queue));
/* FIXME can this be? */
g_cond_signal (queue->item_add);
ret = GST_STATE_FAILURE;
goto error;
} else {
GstScheduler *src_sched, *sink_sched;
src_sched = gst_pad_get_scheduler (GST_PAD (queue->srcpad));
sink_sched = gst_pad_get_scheduler (GST_PAD (queue->sinkpad));
if (src_sched == sink_sched) {
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, queue,
"queue %s does not connect different schedulers",
GST_ELEMENT_NAME (queue));
g_warning ("queue %s does not connect different schedulers",
GST_ELEMENT_NAME (queue));
ret = GST_STATE_FAILURE;
goto error;
}
}
queue->interrupt = FALSE;
break;
case GST_STATE_PAUSED_TO_READY:
gst_queue_locked_flush (queue);
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
/* this is an ugly hack to make sure our pads are always active.
* Reason for this is that pad activation for the queue element
* depends on 2 schedulers (ugh) */
gst_pad_set_active (queue->sinkpad, TRUE);
gst_pad_set_active (queue->srcpad, TRUE);
error:
g_mutex_unlock (queue->qlock);
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "done with state change");
return ret;
}
static void
gst_queue_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstQueue *queue = GST_QUEUE (object);
/* someone could change levels here, and since this
* affects the get/put funcs, we need to lock for safety. */
g_mutex_lock (queue->qlock);
switch (prop_id) {
case ARG_MAX_SIZE_BYTES:
queue->max_size.bytes = g_value_get_uint (value);
break;
case ARG_MAX_SIZE_BUFFERS:
queue->max_size.buffers = g_value_get_uint (value);
break;
case ARG_MAX_SIZE_TIME:
queue->max_size.time = g_value_get_uint64 (value);
break;
case ARG_MIN_TRESHOLD_BYTES:
queue->max_size.bytes = g_value_get_uint (value);
break;
case ARG_MIN_TRESHOLD_BUFFERS:
queue->max_size.buffers = g_value_get_uint (value);
break;
case ARG_MIN_TRESHOLD_TIME:
queue->max_size.time = g_value_get_uint64 (value);
break;
case ARG_LEAKY:
queue->leaky = g_value_get_enum (value);
break;
case ARG_MAY_DEADLOCK:
queue->may_deadlock = g_value_get_boolean (value);
break;
case ARG_BLOCK_TIMEOUT:
queue->block_timeout = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
g_mutex_unlock (queue->qlock);
}
static void
gst_queue_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstQueue *queue = GST_QUEUE (object);
switch (prop_id) {
case ARG_CUR_LEVEL_BYTES:
g_value_set_uint (value, queue->cur_level.bytes);
break;
case ARG_CUR_LEVEL_BUFFERS:
g_value_set_uint (value, queue->cur_level.buffers);
break;
case ARG_CUR_LEVEL_TIME:
g_value_set_uint64 (value, queue->cur_level.time);
break;
case ARG_MAX_SIZE_BYTES:
g_value_set_uint (value, queue->max_size.bytes);
break;
case ARG_MAX_SIZE_BUFFERS:
g_value_set_uint (value, queue->max_size.buffers);
break;
case ARG_MAX_SIZE_TIME:
g_value_set_uint64 (value, queue->max_size.time);
break;
case ARG_MIN_TRESHOLD_BYTES:
g_value_set_uint (value, queue->min_treshold.bytes);
break;
case ARG_MIN_TRESHOLD_BUFFERS:
g_value_set_uint (value, queue->min_treshold.buffers);
break;
case ARG_MIN_TRESHOLD_TIME:
g_value_set_uint64 (value, queue->min_treshold.time);
break;
case ARG_LEAKY:
g_value_set_enum (value, queue->leaky);
break;
case ARG_MAY_DEADLOCK:
g_value_set_boolean (value, queue->may_deadlock);
break;
case ARG_BLOCK_TIMEOUT:
g_value_set_uint64 (value, queue->block_timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
Reference in a new issue View git blame Copy permalink