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gstreamer/plugins/elements/gstqueue.c
Jan Schmidt 009d01a841 Add GST_EVENT_COMMON_FLAG_NEED_RESPONSE flag (TRUE by default) to indicate whether a reply is expected to an upstream... 
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* docs/gst/tmpl/gstevent.sgml:
* gst/gstevent.c: (gst_event_new):
* gst/gstevent.h:
Add GST_EVENT_COMMON_FLAG_NEED_RESPONSE flag (TRUE by default)
to indicate whether a reply is expected to an upstream event.

* gst/gstqueue.c: (gst_queue_finalize),
(gst_queue_handle_pending_events), (gst_queue_handle_src_event):
If GST_EVENT_COMMON_FLAG_NEED_RESPONSE is not set, just queue the
event without blocking on a reply.
2005-03-09 11:45:03 +00:00

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/* 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"
#include "gsterror.h"
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (queue_dataflow);
#define GST_CAT_DEFAULT (queue_dataflow)
#define STATUS(queue, msg) \
GST_CAT_LOG_OBJECT (queue_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_threshold.buffers, \
queue->max_size.buffers, \
queue->cur_level.bytes, \
queue->min_threshold.bytes, \
queue->max_size.bytes, \
queue->cur_level.time, \
queue->min_threshold.time, \
queue->max_size.time, \
queue->queue->length)
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_THRESHOLD_BUFFERS,
ARG_MIN_THRESHOLD_BYTES,
ARG_MIN_THRESHOLD_TIME,
ARG_LEAKY,
ARG_MAY_DEADLOCK,
ARG_BLOCK_TIMEOUT
/* FILL ME */
};
#define GST_QUEUE_MUTEX_LOCK G_STMT_START { \
GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
"locking qlock from thread %p", \
g_thread_self ()); \
g_mutex_lock (queue->qlock); \
GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
"locked qlock from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define GST_QUEUE_MUTEX_UNLOCK G_STMT_START { \
GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
"unlocking qlock from thread %p", \
g_thread_self ()); \
g_mutex_unlock (queue->qlock); \
} G_STMT_END
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_finalize (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 void gst_queue_chain (GstPad * pad, GstData * data);
static GstData *gst_queue_get (GstPad * pad);
static gboolean gst_queue_handle_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_queue_handle_src_query (GstPad * pad,
GstQueryType type, GstFormat * fmt, gint64 * value);
static GstCaps *gst_queue_getcaps (GstPad * pad);
static GstPadLinkReturn
gst_queue_link_sink (GstPad * pad, const GstCaps * caps);
static GstPadLinkReturn gst_queue_link_src (GstPad * pad, const GstCaps * caps);
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),
0,
(GInstanceInitFunc) gst_queue_init,
NULL
};
queue_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstQueue", &queue_info, 0);
GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0,
"dataflow inside the queue element");
}
return queue_type;
}
static void
gst_queue_base_init (GstQueueClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sinktemplate));
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_THRESHOLD_BYTES,
g_param_spec_uint ("min-threshold-bytes", "Min. threshold (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_THRESHOLD_BUFFERS,
g_param_spec_uint ("min-threshold-buffers", "Min. threshold (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_THRESHOLD_TIME,
g_param_spec_uint64 ("min-threshold-time", "Min. threshold (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->finalize = GST_DEBUG_FUNCPTR (gst_queue_finalize);
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_from_template (gst_static_pad_template_get (&sinktemplate),
"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_link_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_link_sink));
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_from_template (gst_static_pad_template_get (&srctemplate),
"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_src));
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_query_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_handle_src_query));
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; /* 100 buffers */
queue->max_size.bytes = 10 * 1024 * 1024; /* 10 MB */
queue->max_size.time = GST_SECOND; /* 1 s. */
queue->min_threshold.buffers = 0; /* no threshold */
queue->min_threshold.bytes = 0; /* no threshold */
queue->min_threshold.time = 0; /* no threshold */
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->event_lock = g_mutex_new ();
queue->queue = g_queue_new ();
GST_CAT_DEBUG_OBJECT (GST_CAT_THREAD, queue,
"initialized queue's not_empty & not_full conditions");
}
/* called only once, as opposed to dispose */
static void
gst_queue_finalize (GObject * object)
{
GstQueue *queue = GST_QUEUE (object);
GST_DEBUG_OBJECT (queue, "finalizing queue");
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);
g_mutex_lock (queue->event_lock);
while (!g_queue_is_empty (queue->events)) {
GstQueueEventResponse *er = g_queue_pop_head (queue->events);
gst_event_unref (er->event);
g_free (er);
}
g_mutex_unlock (queue->event_lock);
g_mutex_free (queue->event_lock);
g_queue_free (queue->events);
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_queue_getcaps (GstPad * pad)
{
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (pad == queue->srcpad && queue->cur_level.bytes > 0) {
return gst_caps_copy (queue->negotiated_caps);
}
return gst_pad_proxy_getcaps (pad);
}
static GstPadLinkReturn
gst_queue_link_sink (GstPad * pad, const GstCaps * caps)
{
GstQueue *queue;
GstPadLinkReturn link_ret;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (queue->cur_level.bytes > 0) {
if (gst_caps_is_equal (caps, queue->negotiated_caps)) {
return GST_PAD_LINK_OK;
} else if (GST_STATE (queue) != GST_STATE_PLAYING) {
return GST_PAD_LINK_DELAYED;
}
/* Wait until the queue is empty before attempting the pad
negotiation. */
GST_QUEUE_MUTEX_LOCK;
STATUS (queue, "waiting for queue to get empty");
while (queue->cur_level.bytes > 0) {
g_cond_wait (queue->item_del, queue->qlock);
if (queue->interrupt) {
GST_QUEUE_MUTEX_UNLOCK;
return GST_PAD_LINK_DELAYED;
}
}
STATUS (queue, "queue is now empty");
GST_QUEUE_MUTEX_UNLOCK;
}
link_ret = gst_pad_proxy_pad_link (pad, caps);
if (GST_PAD_LINK_SUCCESSFUL (link_ret)) {
/* we store an extra copy of the negotiated caps, just in case
* the pads become unnegotiated while we have buffers */
gst_caps_replace (&queue->negotiated_caps, gst_caps_copy (caps));
}
return link_ret;
}
static GstPadLinkReturn
gst_queue_link_src (GstPad * pad, const GstCaps * caps)
{
GstQueue *queue;
GstPadLinkReturn link_ret;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (queue->cur_level.bytes > 0) {
if (gst_caps_is_equal (caps, queue->negotiated_caps)) {
return GST_PAD_LINK_OK;
}
return GST_PAD_LINK_REFUSED;
}
link_ret = gst_pad_proxy_pad_link (pad, caps);
if (GST_PAD_LINK_SUCCESSFUL (link_ret)) {
/* we store an extra copy of the negotiated caps, just in case
* the pads become unnegotiated while we have buffers */
gst_caps_replace (&queue->negotiated_caps, gst_caps_copy (caps));
}
return link_ret;
}
static void
gst_queue_locked_flush (GstQueue * queue)
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "Flushing contents...");
while (!g_queue_is_empty (queue->queue)) {
GstData *data = g_queue_pop_head (queue->queue);
/* First loose the reference we added when putting that data in the queue */
gst_data_unref (data);
/* Then loose another reference because we are supposed to destroy that
data when flushing */
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 */
/* g_queue_get_length is glib 2.4, so don't depend on it yet, use ->length */
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"handling pending events, events queue of size %d",
queue->events->length);
g_mutex_lock (queue->event_lock);
while (!g_queue_is_empty (queue->events)) {
GstQueueEventResponse *er;
gboolean need_response;
er = g_queue_pop_head (queue->events);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"sending event %p (%d) from event response %p upstream",
er->event, GST_EVENT_TYPE (er->event), er);
if (er->handled) {
/* change this to an assert when this file gets reviewed properly. */
GST_ELEMENT_ERROR (queue, CORE, EVENT, (NULL),
("already handled event %p (%d) from event response %p upstream",
er->event, GST_EVENT_TYPE (er->event), er));
break;
}
g_mutex_unlock (queue->event_lock);
need_response =
GST_DATA_FLAG_IS_SET (GST_DATA (er->event),
GST_EVENT_COMMON_FLAG_NEED_RESPONSE);
er->ret = gst_pad_event_default (queue->srcpad, er->event);
if (need_response) {
er->handled = TRUE;
g_cond_signal (queue->event_done);
} else {
g_free (er);
}
g_mutex_lock (queue->event_lock);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "event sent");
}
g_mutex_unlock (queue->event_lock);
}
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_QUEUE_MUTEX_LOCK;
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);
STATUS (queue, "after flush");
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 (queue_dataflow, queue,
"adding event %p of type %d", data, GST_EVENT_TYPE (data));
break;
}
}
if (GST_IS_BUFFER (data))
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"adding buffer %p of size %d and time %" GST_TIME_FORMAT,
data, GST_BUFFER_SIZE (data),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (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))) {
GST_QUEUE_MUTEX_UNLOCK;
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_OVERRUN], 0);
GST_QUEUE_MUTEX_LOCK;
/* 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 (queue_dataflow, queue,
"queue is full, leaking buffer on upstream end");
/* now we can clean up and exit right away */
GST_QUEUE_MUTEX_UNLOCK;
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 (queue_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) {
GstScheduler *sched;
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "interrupted");
sched = gst_pad_get_scheduler (queue->sinkpad);
if (!sched || gst_scheduler_interrupt (sched, GST_ELEMENT (queue))) {
goto ignore_interrupt;
}
GST_QUEUE_MUTEX_UNLOCK;
/* 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 (queue_dataflow, queue,
"not adding pending buffer after flush");
goto out_unref;
}
GST_CAT_DEBUG_OBJECT (queue_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) {
GST_QUEUE_MUTEX_UNLOCK;
gst_data_unref (data);
GST_ELEMENT_ERROR (queue, CORE, THREAD, (NULL),
("deadlock found, shutting down source pad elements"));
/* 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 (queue_dataflow, queue,
"%s: waiting for the app to restart "
"source pad elements", GST_ELEMENT_NAME (queue));
}
}
ignore_interrupt:
/* 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);
if (!queue->interrupt) {
STATUS (queue,
"waiting for item_del signal from thread using qlock");
g_cond_wait (queue->item_del, queue->qlock);
STATUS (queue, "received item_del signal from thread using qlock");
} else {
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"Not waiting, just adding buffer, after interrupt (bad!)");
break;
}
}
STATUS (queue, "post-full wait");
GST_QUEUE_MUTEX_UNLOCK;
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
GST_QUEUE_MUTEX_LOCK;
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 (queue_dataflow, queue, "signalling item_add");
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK;
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_QUEUE_MUTEX_LOCK;
if (queue->queue->length == 0 ||
(queue->min_threshold.buffers > 0 &&
queue->cur_level.buffers < queue->min_threshold.buffers) ||
(queue->min_threshold.bytes > 0 &&
queue->cur_level.bytes < queue->min_threshold.bytes) ||
(queue->min_threshold.time > 0 &&
queue->cur_level.time < queue->min_threshold.time)) {
GST_QUEUE_MUTEX_UNLOCK;
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_UNDERRUN], 0);
GST_QUEUE_MUTEX_LOCK;
STATUS (queue, "pre-empty wait");
while (queue->queue->length == 0 ||
(queue->min_threshold.buffers > 0 &&
queue->cur_level.buffers < queue->min_threshold.buffers) ||
(queue->min_threshold.bytes > 0 &&
queue->cur_level.bytes < queue->min_threshold.bytes) ||
(queue->min_threshold.time > 0 &&
queue->cur_level.time < queue->min_threshold.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) {
GstScheduler *sched;
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "interrupted");
GST_QUEUE_MUTEX_UNLOCK;
sched = gst_pad_get_scheduler (queue->srcpad);
if (!sched || gst_scheduler_interrupt (sched, 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) {
GST_QUEUE_MUTEX_UNLOCK;
GST_ELEMENT_ERROR (queue, CORE, THREAD, (NULL),
("deadlock found, shutting down sink pad elements"));
goto restart;
} else {
GST_CAT_WARNING_OBJECT (queue_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);
GST_LOG_OBJECT (queue, "g_cond_time_wait using qlock from thread %p",
g_thread_self ());
if (!g_cond_timed_wait (queue->item_add, queue->qlock, &timeout)) {
GST_QUEUE_MUTEX_UNLOCK;
GST_CAT_WARNING_OBJECT (queue_dataflow, queue,
"Sending filler event");
return GST_DATA (gst_event_new_filler ());
}
} else {
GST_LOG_OBJECT (queue, "doing g_cond_wait using qlock from thread %p",
g_thread_self ());
g_cond_wait (queue->item_add, queue->qlock);
GST_LOG_OBJECT (queue, "done g_cond_wait using qlock from thread %p",
g_thread_self ());
}
STATUS (queue, "got item_add signal");
}
STATUS (queue, "post-empty wait");
GST_QUEUE_MUTEX_UNLOCK;
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
GST_QUEUE_MUTEX_LOCK;
}
/* There's something in the list now, whatever it is */
data = g_queue_pop_head (queue->queue);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved data %p from queue", data);
if (data == NULL)
return NULL;
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);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"Got buffer of time %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (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 (queue_dataflow, queue, "signalling item_del");
g_cond_signal (queue->item_del);
GST_QUEUE_MUTEX_UNLOCK;
/* 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 (queue_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;
GstQueueEventResponse *er = NULL;
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%d)",
event, GST_EVENT_TYPE (event));
GST_QUEUE_MUTEX_LOCK;
if (gst_element_get_state (GST_ELEMENT (queue)) == GST_STATE_PLAYING) {
gboolean need_response =
GST_DATA_FLAG_IS_SET (GST_DATA (event),
GST_EVENT_COMMON_FLAG_NEED_RESPONSE);
er = g_new (GstQueueEventResponse, 1);
/* push the event to the queue and wait for upstream consumption */
er->event = event;
er->handled = FALSE;
g_mutex_lock (queue->event_lock);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"putting event %p (%d) on internal queue", event,
GST_EVENT_TYPE (event));
g_queue_push_tail (queue->events, er);
g_mutex_unlock (queue->event_lock);
if (!need_response) {
/* Leave for upstream to delete */
er = NULL;
res = TRUE;
goto handled;
}
GST_CAT_WARNING_OBJECT (queue_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) {
GTimeVal timeout;
g_get_current_time (&timeout);
g_time_val_add (&timeout, 500 * 1000); /* half a second */
GST_LOG_OBJECT (queue, "doing g_cond_wait using qlock from thread %p",
g_thread_self ());
if (!g_cond_timed_wait (queue->event_done, queue->qlock, &timeout) &&
!er->handled) {
GST_CAT_WARNING_OBJECT (queue_dataflow, queue,
"timeout in upstream event handling, dropping event %p (%d)",
er->event, GST_EVENT_TYPE (er->event));
g_mutex_lock (queue->event_lock);
/* since this queue is for src events (ie upstream), this thread is
* the only one that is pushing stuff on it, so we're sure that
* it's still the tail element. FIXME: But in practice, we should use
* GList instead of GQueue for this so we can remove any element in
* the list. */
g_queue_pop_tail (queue->events);
g_mutex_unlock (queue->event_lock);
gst_event_unref (er->event);
res = FALSE;
goto handled;
}
}
GST_CAT_WARNING_OBJECT (queue_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 (queue_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);
}
break;
default:
break;
}
}
handled:
GST_QUEUE_MUTEX_UNLOCK;
if (er)
g_free (er);
return res;
}
static gboolean
gst_queue_handle_src_query (GstPad * pad,
GstQueryType type, GstFormat * fmt, gint64 * value)
{
GstQueue *queue = GST_QUEUE (gst_pad_get_parent (pad));
gboolean res;
if (!GST_PAD_PEER (queue->sinkpad))
return FALSE;
res = gst_pad_query (GST_PAD_PEER (queue->sinkpad), type, fmt, value);
if (!res)
return FALSE;
if (type == GST_QUERY_POSITION) {
/* FIXME: this code assumes that there's no discont in the queue */
switch (*fmt) {
case GST_FORMAT_BYTES:
if (*value >= queue->cur_level.bytes)
*value -= queue->cur_level.bytes;
else
*value = 0;
break;
case GST_FORMAT_TIME:
if (*value >= queue->cur_level.time)
*value -= queue->cur_level.time;
else
*value = 0;
break;
default:
/* FIXME */
break;
}
}
return TRUE;
}
static gboolean
gst_queue_release_locks (GstElement * element)
{
GstQueue *queue;
queue = GST_QUEUE (element);
GST_QUEUE_MUTEX_LOCK;
queue->interrupt = TRUE;
g_cond_signal (queue->item_add);
g_cond_signal (queue->item_del);
GST_QUEUE_MUTEX_UNLOCK;
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 0x%x", GST_STATE_TRANSITION (element));
/* lock the queue so another thread (not in sync with this thread's state)
* can't call this queue's _get (or whatever)
*/
GST_QUEUE_MUTEX_LOCK;
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 unlock;
} 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 unlock;
}
}
queue->interrupt = FALSE;
break;
case GST_STATE_PAUSED_TO_READY:
gst_queue_locked_flush (queue);
gst_caps_replace (&queue->negotiated_caps, NULL);
break;
default:
break;
}
GST_QUEUE_MUTEX_UNLOCK;
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);
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "done with state change");
return ret;
unlock:
GST_QUEUE_MUTEX_UNLOCK;
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. */
GST_QUEUE_MUTEX_LOCK;
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_THRESHOLD_BYTES:
queue->min_threshold.bytes = g_value_get_uint (value);
break;
case ARG_MIN_THRESHOLD_BUFFERS:
queue->min_threshold.buffers = g_value_get_uint (value);
break;
case ARG_MIN_THRESHOLD_TIME:
queue->min_threshold.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;
}
GST_QUEUE_MUTEX_UNLOCK;
}
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_THRESHOLD_BYTES:
g_value_set_uint (value, queue->min_threshold.bytes);
break;
case ARG_MIN_THRESHOLD_BUFFERS:
g_value_set_uint (value, queue->min_threshold.buffers);
break;
case ARG_MIN_THRESHOLD_TIME:
g_value_set_uint64 (value, queue->min_threshold.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;
}
}
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