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gstreamer/plugins/elements/gstqueue.c
Tim-Philipp Müller 54cf7775fb gst/gst.c: Docs typo fix. 
Original commit message from CVS:
* gst/gst.c:
Docs typo fix.
* plugins/elements/gstqueue.c: (gst_queue_class_init),
(gst_queue_init):
Fix incorrect documentation and flesh it out a bit more.
Set default values for the max properties on the GParamSpec as well,
so it shows up correctly in gst-inspect.
2006-12-19 11:04:49 +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>
* 2005 Wim Taymans <wim@fluendo.com>
*
* 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.
*/
/**
* SECTION:element-queue
* @short_description: Simple asynchronous data queue.
*
* Data is queued until one of the limits specified by the
* #GstQueue:max-size-buffers, #GstQueue:max-size-bytes and/or
* #GstQueue:max-size-time properties has been reached. Any attempt to push
* more buffers into the queue will block the pushing thread until more space
* becomes available.
*
* The queue will create a new thread on the source pad to decouple the
* processing on sink and source pad.
*
* You can query how many buffers are queued by reading the
* #GstQueue:current-level-buffers property. You can track changes
* by connecting to the notify::current-level-buffers signal (which
* like all signals will be emitted from the streaming thread). The same
* applies to the #GstQueue:current-level-time and
* #GstQueue:current-level-bytes properties.
*
* The default queue size limits are 200 buffers, 10MB of data, or
* one second worth of data, whichever is reached first.
*
* As said earlier, the queue blocks by default when one of the specified
* maximums (bytes, time, buffers) has been reached. You can set the
* #GstQueue:leaky property to specify that instead of blocking it should
* leak (drop) new or old buffers.
*
* The #GstQueue::underrun signal is emitted when the queue has less data than
* the specified minimum thresholds require (by default: when the queue is
* empty). The #GstQueue::overrun signal is emitted when the queue is filled
* up. Both signals are emitted from the context of the streaming thread.
*/
#include "gst/gst_private.h"
#include <gst/gst.h>
#include "gstqueue.h"
#include "../../gst/gst-i18n-lib.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_debug);
#define GST_CAT_DEFAULT (queue_debug)
GST_DEBUG_CATEGORY_STATIC (queue_dataflow);
#define STATUS(queue, pad, 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 const 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,
/* FILL ME */
};
/* default property values */
#define DEFAULT_MAX_SIZE_BUFFERS 200 /* 200 buffers */
#define DEFAULT_MAX_SIZE_BYTES (10 * 1024 * 1024) /* 10 MB */
#define DEFAULT_MAX_SIZE_TIME GST_SECOND /* 1 second */
#define GST_QUEUE_MUTEX_LOCK(q) G_STMT_START { \
GST_CAT_LOG_OBJECT (queue_dataflow, q, \
"locking qlock from thread %p", \
g_thread_self ()); \
g_mutex_lock (q->qlock); \
GST_CAT_LOG_OBJECT (queue_dataflow, q, \
"locked qlock from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define GST_QUEUE_MUTEX_LOCK_CHECK(q,label) G_STMT_START { \
GST_QUEUE_MUTEX_LOCK (q); \
if (q->srcresult != GST_FLOW_OK) \
goto label; \
} G_STMT_END
#define GST_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \
GST_CAT_LOG_OBJECT (queue_dataflow, q, \
"unlocking qlock from thread %p", \
g_thread_self ()); \
g_mutex_unlock (q->qlock); \
} G_STMT_END
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 GstFlowReturn gst_queue_chain (GstPad * pad, GstBuffer * buffer);
static GstFlowReturn gst_queue_bufferalloc (GstPad * pad, guint64 offset,
guint size, GstCaps * caps, GstBuffer ** buf);
static gboolean gst_queue_acceptcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_queue_push_one (GstQueue * queue);
static void gst_queue_loop (GstPad * pad);
static gboolean gst_queue_handle_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_queue_handle_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_queue_handle_src_query (GstPad * pad, GstQuery * query);
static GstCaps *gst_queue_getcaps (GstPad * pad);
static GstPadLinkReturn gst_queue_link_sink (GstPad * pad, GstPad * peer);
static GstPadLinkReturn gst_queue_link_src (GstPad * pad, GstPad * peer);
static void gst_queue_locked_flush (GstQueue * queue);
static gboolean gst_queue_src_activate_push (GstPad * pad, gboolean active);
static gboolean gst_queue_sink_activate_push (GstPad * pad, gboolean active);
static GstStateChangeReturn gst_queue_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_queue_is_empty (GstQueue * queue);
static gboolean gst_queue_is_filled (GstQueue * queue);
#define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type ())
static GType
queue_leaky_get_type (void)
{
static GType queue_leaky_type = 0;
static const GEnumValue queue_leaky[] = {
{GST_QUEUE_NO_LEAK, "Not Leaky", "no"},
{GST_QUEUE_LEAK_UPSTREAM, "Leaky on upstream (new buffers)", "upstream"},
{GST_QUEUE_LEAK_DOWNSTREAM, "Leaky on downstream (old buffers)",
"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_debug, "queue", 0, "queue element");
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);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);
/* signals */
/**
* GstQueue::underrun:
* @queue: the queue instance
*
* Reports that the buffer became empty (underrun).
* A buffer is empty if the total amount of data inside it (num-buffers, time,
* size) is lower than the boundary values which can be set through the GObject
* properties.
*/
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);
/**
* GstQueue::running:
* @queue: the queue instance
*
* Reports that enough (min-threshold) data is in the queue. Use this signal
* together with the underrun signal to pause the pipeline on underrun and wait
* for the queue to fill-up before resume playback.
*/
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);
/**
* GstQueue::overrun:
* @queue: the queue instance
*
* Reports that the buffer became full (overrun).
* A buffer is full if the total amount of data inside it (num-buffers, time,
* size) is higher than the boundary values which can be set through the GObject
* properties.
*/
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, DEFAULT_MAX_SIZE_BYTES, 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, DEFAULT_MAX_SIZE_BUFFERS, 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, DEFAULT_MAX_SIZE_TIME, 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));
/* set several parent class virtual functions */
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_queue_finalize);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
}
static void
gst_queue_init (GstQueue * queue)
{
queue->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
gst_pad_set_chain_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_chain));
gst_pad_set_activatepush_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_sink_activate_push));
gst_pad_set_event_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_handle_sink_event));
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_bufferalloc_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_bufferalloc));
gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
queue->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_activatepush_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_src_activate_push));
gst_pad_set_link_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_link_src));
gst_pad_set_acceptcaps_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_acceptcaps));
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_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
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 = DEFAULT_MAX_SIZE_BUFFERS;
queue->max_size.bytes = DEFAULT_MAX_SIZE_BYTES;
queue->max_size.time = DEFAULT_MAX_SIZE_TIME;
queue->min_threshold.buffers = 0; /* no threshold */
queue->min_threshold.bytes = 0; /* no threshold */
queue->min_threshold.time = 0; /* no threshold */
queue->orig_min_threshold.buffers = 0;
queue->orig_min_threshold.bytes = 0;
queue->orig_min_threshold.time = 0;
queue->leaky = GST_QUEUE_NO_LEAK;
queue->srcresult = GST_FLOW_WRONG_STATE;
queue->qlock = g_mutex_new ();
queue->item_add = g_cond_new ();
queue->item_del = g_cond_new ();
queue->queue = g_queue_new ();
GST_DEBUG_OBJECT (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)) {
GstMiniObject *data = g_queue_pop_head (queue->queue);
gst_mini_object_unref (data);
}
g_queue_free (queue->queue);
GST_DEBUG_OBJECT (queue, "free mutex");
g_mutex_free (queue->qlock);
GST_DEBUG_OBJECT (queue, "done free mutex");
g_cond_free (queue->item_add);
g_cond_free (queue->item_del);
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_queue_getcaps (GstPad * pad)
{
GstQueue *queue;
GstPad *otherpad;
GstCaps *result;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
otherpad = (pad == queue->srcpad ? queue->sinkpad : queue->srcpad);
result = gst_pad_peer_get_caps (otherpad);
if (result == NULL)
result = gst_caps_new_any ();
return result;
}
static GstPadLinkReturn
gst_queue_link_sink (GstPad * pad, GstPad * peer)
{
return GST_PAD_LINK_OK;
}
static GstPadLinkReturn
gst_queue_link_src (GstPad * pad, GstPad * peer)
{
GstPadLinkReturn result = GST_PAD_LINK_OK;
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (queue, "queue linking source pad");
if (GST_PAD_LINKFUNC (peer)) {
result = GST_PAD_LINKFUNC (peer) (peer, pad);
}
if (GST_PAD_LINK_SUCCESSFUL (result)) {
GST_QUEUE_MUTEX_LOCK (queue);
if (queue->srcresult == GST_FLOW_OK) {
gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad);
GST_DEBUG_OBJECT (queue, "starting task as pad is linked");
} else {
GST_DEBUG_OBJECT (queue, "not starting task reason %s",
gst_flow_get_name (queue->srcresult));
}
GST_QUEUE_MUTEX_UNLOCK (queue);
}
gst_object_unref (queue);
return result;
}
static GstFlowReturn
gst_queue_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps,
GstBuffer ** buf)
{
GstQueue *queue;
GstFlowReturn result;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
/* Forward to src pad, without setting caps on the src pad */
result = gst_pad_alloc_buffer (queue->srcpad, offset, size, caps, buf);
return result;
}
static gboolean
gst_queue_acceptcaps (GstPad * pad, GstCaps * caps)
{
/* The only time our acceptcaps method should be called is on the srcpad
* when we push a buffer, in which case we always accept those caps */
return TRUE;
}
static void
gst_queue_locked_flush (GstQueue * queue)
{
while (!g_queue_is_empty (queue->queue)) {
GstMiniObject *data = g_queue_pop_head (queue->queue);
/* Then lose another reference because we are supposed to destroy that
data when flushing */
gst_mini_object_unref (data);
}
queue->cur_level.buffers = 0;
queue->cur_level.bytes = 0;
queue->cur_level.time = 0;
queue->min_threshold.buffers = queue->orig_min_threshold.buffers;
queue->min_threshold.bytes = queue->orig_min_threshold.bytes;
queue->min_threshold.time = queue->orig_min_threshold.time;
/* we deleted something... */
g_cond_signal (queue->item_del);
}
static gboolean
gst_queue_handle_sink_event (GstPad * pad, GstEvent * event)
{
GstQueue *queue;
gboolean have_eos = FALSE;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
STATUS (queue, pad, "received flush start event");
/* forward event */
gst_pad_push_event (queue->srcpad, event);
/* now unblock the chain function */
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_WRONG_STATE;
/* unblock the loop and chain functions */
g_cond_signal (queue->item_add);
g_cond_signal (queue->item_del);
GST_QUEUE_MUTEX_UNLOCK (queue);
/* make sure it pauses, this should happen since we sent
* flush_start downstream. */
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "loop stopped");
goto done;
case GST_EVENT_FLUSH_STOP:
STATUS (queue, pad, "received flush stop event");
/* forward event */
gst_pad_push_event (queue->srcpad, event);
GST_QUEUE_MUTEX_LOCK (queue);
gst_queue_locked_flush (queue);
queue->srcresult = GST_FLOW_OK;
if (gst_pad_is_linked (queue->srcpad)) {
gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
queue->srcpad);
} else {
GST_DEBUG_OBJECT (queue, "not re-starting task as pad is not linked");
}
GST_QUEUE_MUTEX_UNLOCK (queue);
STATUS (queue, pad, "after flush");
goto done;
case GST_EVENT_EOS:
STATUS (queue, pad, "received EOS");
have_eos = TRUE;
break;
default:
if (GST_EVENT_IS_SERIALIZED (event)) {
/* 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", event, GST_EVENT_TYPE (event));
} else {
gst_pad_push_event (queue->srcpad, event);
goto done;
}
break;
}
GST_QUEUE_MUTEX_LOCK (queue);
if (have_eos) {
/* Zero the thresholds, this makes sure the queue is completely
* filled and we can read all data from the queue. */
queue->min_threshold.buffers = 0;
queue->min_threshold.bytes = 0;
queue->min_threshold.time = 0;
}
g_queue_push_tail (queue->queue, event);
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK (queue);
done:
return TRUE;
}
static gboolean
gst_queue_is_empty (GstQueue * queue)
{
return (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));
}
static gboolean
gst_queue_is_filled (GstQueue * queue)
{
return (((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)));
}
static GstFlowReturn
gst_queue_chain (GstPad * pad, GstBuffer * buffer)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
/* we have to lock the queue since we span threads */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"adding buffer %p of size %d", buffer, GST_BUFFER_SIZE (buffer));
/* 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. */
while (gst_queue_is_filled (queue)) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_OVERRUN], 0);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* 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 */
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;
GstMiniObject *leak = NULL;
if (!gst_queue_is_filled (queue)) {
/* Queue was emptied while we sent out the signal, so no need to drop */
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"queue emptied while emitting signal, not leaking buffer");
break;
}
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"queue is full, leaking buffer on downstream end");
for (item = g_queue_peek_head_link (queue->queue); item;
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 the link from the queue */
g_queue_delete_link (queue->queue, item);
/* and unref the buffer 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 (leak);
queue->cur_level.buffers--;
if (GST_BUFFER_DURATION (leak) != GST_CLOCK_TIME_NONE)
queue->cur_level.time -= GST_BUFFER_DURATION (leak);
gst_buffer_unref (leak);
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, pad, "pre-full wait");
/* we recheck, the signal could have changed the thresholds */
while (gst_queue_is_filled (queue)) {
STATUS (queue, pad,
"waiting for item_del signal from thread using qlock");
g_cond_wait (queue->item_del, queue->qlock);
if (queue->srcresult != GST_FLOW_OK)
goto out_flushing;
/* if there's a pending state change for this queue
* or its manager, switch back to iterator so bottom
* half of state change executes */
STATUS (queue, pad,
"received item_del signal from thread using qlock");
}
STATUS (queue, pad, "post-full wait");
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
break;
}
}
g_queue_push_tail (queue->queue, buffer);
/* add buffer to the statistics */
queue->cur_level.buffers++;
queue->cur_level.bytes += GST_BUFFER_SIZE (buffer);
if (GST_BUFFER_DURATION (buffer) != GST_CLOCK_TIME_NONE)
queue->cur_level.time += GST_BUFFER_DURATION (buffer);
STATUS (queue, pad, "+ level");
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "signalling item_add");
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK (queue);
return GST_FLOW_OK;
/* special conditions */
out_unref:
{
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
out_flushing:
{
GstFlowReturn ret = queue->srcresult;
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because task paused, reason: %s", gst_flow_get_name (ret));
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return ret;
}
}
static gboolean
gst_queue_push_one (GstQueue * queue)
{
gboolean restart = TRUE;
GstMiniObject *data;
/* 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 (GST_IS_BUFFER (data)) {
GstFlowReturn result;
/* 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_QUEUE_MUTEX_UNLOCK (queue);
result = gst_pad_push (queue->srcpad, GST_BUFFER (data));
/* need to check for srcresult here as well */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* else result of push indicates what happens */
if (result != GST_FLOW_OK) {
const gchar *flowname;
flowname = gst_flow_get_name (result);
queue->srcresult = result;
GST_DEBUG_OBJECT (queue, "pausing queue, reason %s", flowname);
gst_pad_pause_task (queue->srcpad);
}
} else if (GST_IS_EVENT (data)) {
if (GST_EVENT_TYPE (data) == GST_EVENT_EOS) {
queue->cur_level.buffers = 0;
queue->cur_level.bytes = 0;
queue->cur_level.time = 0;
/* all incomming data is now unexpected */
queue->srcresult = GST_FLOW_UNEXPECTED;
/* and we don't need to process anymore */
GST_DEBUG_OBJECT (queue, "pausing queue, we're EOS now");
gst_pad_pause_task (queue->srcpad);
restart = FALSE;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_pad_push_event (queue->srcpad, GST_EVENT (data));
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
if (restart == TRUE)
return TRUE;
} else {
g_warning ("Unexpected object in queue %s (refcounting problem?)",
GST_OBJECT_NAME (queue));
}
STATUS (queue, queue->srcpad, "after _get()");
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "signalling item_del");
g_cond_signal (queue->item_del);
return FALSE;
out_flushing:
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because task paused, reason: %s",
gst_flow_get_name (queue->srcresult));
return FALSE; /* FALSE == no restart */
}
static void
gst_queue_loop (GstPad * pad)
{
GstQueue *queue;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
/* have to lock for thread-safety */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
restart:
while (gst_queue_is_empty (queue)) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_UNDERRUN], 0);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
STATUS (queue, pad, "pre-empty wait");
/* we recheck, the signal could have changed the thresholds */
while (gst_queue_is_empty (queue)) {
STATUS (queue, pad, "waiting for item_add");
GST_LOG_OBJECT (queue, "doing g_cond_wait using qlock from thread %p",
g_thread_self ());
g_cond_wait (queue->item_add, queue->qlock);
/* we released the lock in the g_cond above so we might be
* flushing now */
if (queue->srcresult != GST_FLOW_OK)
goto out_flushing;
GST_LOG_OBJECT (queue, "done g_cond_wait using qlock from thread %p",
g_thread_self ());
STATUS (queue, pad, "got item_add signal");
}
STATUS (queue, pad, "post-empty wait");
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
}
if (gst_queue_push_one (queue))
goto restart;
GST_QUEUE_MUTEX_UNLOCK (queue);
return;
out_flushing:
{
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because task paused, reason: %s",
gst_flow_get_name (queue->srcresult));
GST_QUEUE_MUTEX_UNLOCK (queue);
return;
}
}
static gboolean
gst_queue_handle_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));
#ifndef GST_DISABLE_GST_DEBUG
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%d)",
event, GST_EVENT_TYPE (event));
#endif
res = gst_pad_push_event (queue->sinkpad, event);
return res;
}
static gboolean
gst_queue_handle_src_query (GstPad * pad, GstQuery * query)
{
GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));
GstPad *peer;
gboolean res;
if (!(peer = gst_pad_get_peer (queue->sinkpad)))
return FALSE;
res = gst_pad_query (peer, query);
gst_object_unref (peer);
if (!res)
return FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 peer_pos;
GstFormat format;
/* get peer position */
gst_query_parse_position (query, &format, &peer_pos);
/* FIXME: this code assumes that there's no discont in the queue */
switch (format) {
case GST_FORMAT_BYTES:
peer_pos -= queue->cur_level.bytes;
break;
case GST_FORMAT_TIME:
peer_pos -= queue->cur_level.time;
break;
default:
GST_WARNING_OBJECT (queue, "dropping query in %s format, don't "
"know how to adjust value", gst_format_get_name (format));
return FALSE;
}
/* set updated position */
gst_query_set_position (query, format, peer_pos);
break;
}
default:
/* peer handled other queries */
break;
}
return TRUE;
}
static gboolean
gst_queue_sink_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (active) {
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_OK;
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* step 1, unblock chain function */
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_WRONG_STATE;
gst_queue_locked_flush (queue);
GST_QUEUE_MUTEX_UNLOCK (queue);
}
gst_object_unref (queue);
return result;
}
static gboolean
gst_queue_src_activate_push (GstPad * pad, gboolean active)
{
gboolean result = FALSE;
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (active) {
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_OK;
/* we do not start the task yet if the pad is not connected */
if (gst_pad_is_linked (pad))
result = gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad);
else {
GST_DEBUG_OBJECT (queue, "not starting task as pad is not linked");
result = TRUE;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* step 1, unblock loop function */
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_WRONG_STATE;
/* the item add signal will unblock */
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK (queue);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
}
gst_object_unref (queue);
return result;
}
static GstStateChangeReturn
gst_queue_change_state (GstElement * element, GstStateChange transition)
{
GstQueue *queue;
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
queue = GST_QUEUE (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
/* changing the capacity of the queue must wake up
* the _chain function, it might have more room now
* to store the buffer/event in the queue */
#define QUEUE_CAPACITY_CHANGE(q)\
g_cond_signal (queue->item_del);
/* Changing the minimum required fill level must
* wake up the _loop function as it might now
* be able to preceed.
*/
#define QUEUE_THRESHOLD_CHANGE(q)\
g_cond_signal (queue->item_add);
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 (queue);
switch (prop_id) {
case ARG_MAX_SIZE_BYTES:
queue->max_size.bytes = g_value_get_uint (value);
QUEUE_CAPACITY_CHANGE (queue);
break;
case ARG_MAX_SIZE_BUFFERS:
queue->max_size.buffers = g_value_get_uint (value);
QUEUE_CAPACITY_CHANGE (queue);
break;
case ARG_MAX_SIZE_TIME:
queue->max_size.time = g_value_get_uint64 (value);
QUEUE_CAPACITY_CHANGE (queue);
break;
case ARG_MIN_THRESHOLD_BYTES:
queue->min_threshold.bytes = g_value_get_uint (value);
queue->orig_min_threshold.bytes = queue->min_threshold.bytes;
QUEUE_THRESHOLD_CHANGE (queue);
break;
case ARG_MIN_THRESHOLD_BUFFERS:
queue->min_threshold.buffers = g_value_get_uint (value);
queue->orig_min_threshold.buffers = queue->min_threshold.buffers;
QUEUE_THRESHOLD_CHANGE (queue);
break;
case ARG_MIN_THRESHOLD_TIME:
queue->min_threshold.time = g_value_get_uint64 (value);
queue->orig_min_threshold.time = queue->min_threshold.time;
QUEUE_THRESHOLD_CHANGE (queue);
break;
case ARG_LEAKY:
queue->leaky = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
}
static void
gst_queue_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstQueue *queue = GST_QUEUE (object);
GST_QUEUE_MUTEX_LOCK (queue);
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
}
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