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gstreamer/plugins/elements/gstqueue.c
Ronald S. Bultje 66d5da4f17 Add two new functions for filler events (which are used to synchronize streams if one of them is not having any data ... 
Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* docs/gst/tmpl/gstevent.sgml:
* gst/gstevent.c: (gst_event_new_filler_stamped),
(gst_event_filler_get_duration):
* gst/gstevent.h:
Add two new functions for filler events (which are used to
synchronize streams if one of them is not having any data
for a while) without interrupting the actual data-stream.
Basically a no-op.
* gst/gstqueue.c: (gst_queue_init), (gst_queue_getcaps),
(gst_queue_link_sink), (gst_queue_link_src),
(gst_queue_change_state):
Allow for renegotiation while filled. Required for stream
switching while playing.
2005-01-08 18:10:50 +00:00

1177 lines
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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_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)
{
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;
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);
er->ret = gst_pad_event_default (queue->srcpad, er->event);
er->handled = TRUE;
g_cond_signal (queue->event_done);
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", 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))) {
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) {
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "interrupted");
GST_QUEUE_MUTEX_UNLOCK;
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 (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));
}
}
/* 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 from thread using qlock");
g_cond_wait (queue->item_del, queue->qlock);
STATUS (queue, "received item_del signal from thread using qlock");
}
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) {
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "interrupted");
GST_QUEUE_MUTEX_UNLOCK;
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) {
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);
}
/* 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;
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) {
GstQueueEventResponse er;
/* 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);
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);
}
default:
break;
}
}
handled:
GST_QUEUE_MUTEX_UNLOCK;
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:
*value -= queue->cur_level.bytes;
break;
case GST_FORMAT_TIME:
*value -= queue->cur_level.time;
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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