gstreamer/plugins/elements/gstqueue.c
Wim Taymans c2f41a8906 Next big merge.
Original commit message from CVS:
Next big merge.
Added GstBus for mainloop integration.
Added GstMessage for sending notifications on the bus.
Added GstTask as an abstraction for pipeline entry points.
Removed GstThread.
Removed Schedulers.
Simplified GstQueue for multithreaded core.
Made _link threadsafe, removed old capsnego.
Added STREAM_LOCK and PREROLL_LOCK in GstPad.
Added pad blocking functions.
Reworked scheduling functions in GstPad to prepare for
scheduling updates soon.
Moved events out of data stream.
Simplified GstEvent types.
Added return values to push/pull.
Removed clocking from GstElement.
Added prototypes for state change function for next merge.
Removed iterate from bins and state change management.
Fixed some elements, disabled others for now.
Fixed -inspect and -launch.
Added check for GstBus.
2005-03-21 17:34:02 +00:00

1020 lines
31 KiB
C

/* 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.
*/
#include "gst_private.h"
#include "gstqueue.h"
#include "gstscheduler.h"
#include "gstpipeline.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
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 GstBuffer *gst_queue_bufferalloc (GstPad * pad, guint64 offset,
guint size, GstCaps * caps);
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,
GstQueryType type, GstFormat * fmt, gint64 * value);
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 (GstPad * pad, GstActivateMode mode);
static GstElementStateReturn gst_queue_change_state (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);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);
/* 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);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
}
static void
gst_queue_init (GstQueue * queue)
{
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_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_template (gst_static_pad_template_get (&srctemplate),
"src");
gst_pad_set_loop_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_loop));
gst_pad_set_activate_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_src_activate));
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_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 = 200; /* 200 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->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);
GST_CAT_DEBUG_OBJECT (GST_CAT_THREAD, queue, "free mutex");
g_mutex_free (queue->qlock);
GST_CAT_DEBUG_OBJECT (GST_CAT_THREAD, 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);
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;
/* FIXME, see if we need to push or get pulled */
if (GST_RPAD_LINKFUNC (peer))
result = GST_RPAD_LINKFUNC (peer) (peer, pad);
return result;
}
static GstBuffer *
gst_queue_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps)
{
GstQueue *queue;
GstPad *otherpeer;
GstBuffer *result = NULL;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
otherpeer = gst_pad_get_peer (queue->srcpad);
if (otherpeer == NULL || GST_RPAD_BUFFERALLOCFUNC (otherpeer) == NULL) {
/* let the default aloc function do the work */
result = NULL;
} else {
result =
GST_RPAD_BUFFERALLOCFUNC (otherpeer) (otherpeer, offset, size, caps);
}
if (otherpeer)
gst_object_unref (GST_OBJECT (otherpeer));
return result;
}
static void
gst_queue_locked_flush (GstQueue * queue)
{
while (!g_queue_is_empty (queue->queue)) {
GstData *data = g_queue_pop_head (queue->queue);
/* Then loose another reference because we are supposed to destroy that
data when flushing */
gst_data_unref (data);
}
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);
}
#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 gboolean
gst_queue_handle_sink_event (GstPad * pad, GstEvent * event)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH:
STATUS (queue, "received flush event");
/* forward event */
gst_pad_event_default (pad, event);
if (GST_EVENT_FLUSH_DONE (event)) {
GST_STREAM_LOCK (queue->srcpad);
gst_task_start (GST_RPAD_TASK (queue->srcpad));
GST_STREAM_UNLOCK (queue->srcpad);
} else {
/* now unblock the chain function */
GST_QUEUE_MUTEX_LOCK;
gst_queue_locked_flush (queue);
GST_QUEUE_MUTEX_UNLOCK;
STATUS (queue, "after flush");
/* unblock the loop function */
g_cond_signal (queue->item_add);
/* make sure it stops */
GST_STREAM_LOCK (queue->srcpad);
gst_task_pause (GST_RPAD_TASK (queue->srcpad));
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "loop stopped");
GST_STREAM_UNLOCK (queue->srcpad);
}
goto done;
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", event, GST_EVENT_TYPE (event));
break;
}
GST_QUEUE_MUTEX_LOCK;
g_queue_push_tail (queue->queue, event);
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK;
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));
GST_STREAM_LOCK (pad);
/* we have to lock the queue since we span threads */
GST_QUEUE_MUTEX_LOCK;
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;
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 */
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 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 (buffer);
queue->cur_level.buffers--;
if (GST_BUFFER_DURATION (buffer) != GST_CLOCK_TIME_NONE)
queue->cur_level.time -= GST_BUFFER_DURATION (buffer);
gst_buffer_unref (buffer);
gst_buffer_unref (buffer);
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 (gst_queue_is_filled (queue)) {
STATUS (queue, "waiting for item_del signal from thread using qlock");
g_cond_wait (queue->item_del, queue->qlock);
/* 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, "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;
}
}
/* we are flushing */
if (GST_RPAD_IS_FLUSHING (pad))
goto out_flushing;
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, "+ level");
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "signalling item_add");
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK;
GST_STREAM_UNLOCK (pad);
return GST_FLOW_OK;
out_unref:
GST_QUEUE_MUTEX_UNLOCK;
GST_STREAM_UNLOCK (pad);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
out_flushing:
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because of flush");
GST_QUEUE_MUTEX_UNLOCK;
gst_task_pause (GST_RPAD_TASK (queue->srcpad));
GST_STREAM_UNLOCK (pad);
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
static void
gst_queue_loop (GstPad * pad)
{
GstQueue *queue;
GstData *data;
gboolean restart = TRUE;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
GST_STREAM_LOCK (pad);
/* have to lock for thread-safety */
GST_QUEUE_MUTEX_LOCK;
restart:
while (gst_queue_is_empty (queue)) {
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 (gst_queue_is_empty (queue)) {
STATUS (queue, "waiting for item_add");
/* we are flushing */
if (GST_RPAD_IS_FLUSHING (queue->sinkpad))
goto out_flushing;
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 got unlocked because we are flushing */
if (GST_RPAD_IS_FLUSHING (queue->sinkpad))
goto out_flushing;
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 (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;
result = gst_pad_push (pad, GST_BUFFER (data));
GST_QUEUE_MUTEX_LOCK;
if (result != GST_FLOW_OK) {
gst_task_pause (GST_RPAD_TASK (queue->srcpad));
}
} else {
if (GST_EVENT_TYPE (data) == GST_EVENT_EOS) {
gst_task_pause (GST_RPAD_TASK (queue->srcpad));
restart = FALSE;
}
GST_QUEUE_MUTEX_UNLOCK;
gst_pad_push_event (queue->srcpad, GST_EVENT (data));
GST_QUEUE_MUTEX_LOCK;
if (restart == TRUE)
goto restart;
}
STATUS (queue, "after _get()");
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "signalling item_del");
g_cond_signal (queue->item_del);
GST_QUEUE_MUTEX_UNLOCK;
GST_STREAM_UNLOCK (pad);
return;
out_flushing:
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because of flush");
gst_task_pause (GST_RPAD_TASK (pad));
GST_QUEUE_MUTEX_UNLOCK;
GST_STREAM_UNLOCK (pad);
return;
}
static gboolean
gst_queue_handle_src_event (GstPad * pad, GstEvent * event)
{
GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));
gboolean res = TRUE;
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%d)",
event, GST_EVENT_TYPE (event));
gst_event_ref (event);
res = gst_pad_event_default (pad, event);
GST_QUEUE_MUTEX_LOCK;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH) {
gst_queue_locked_flush (queue);
}
default:
break;
}
GST_QUEUE_MUTEX_UNLOCK;
gst_event_unref (event);
return res;
}
static gboolean
gst_queue_handle_src_query (GstPad * pad,
GstQueryType type, GstFormat * fmt, gint64 * value)
{
GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));
if (!GST_PAD_PEER (queue->sinkpad))
return FALSE;
if (!gst_pad_query (GST_PAD_PEER (queue->sinkpad), type, fmt, value))
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_src_activate (GstPad * pad, GstActivateMode mode)
{
gboolean result = FALSE;
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
if (mode == GST_ACTIVATE_PUSH) {
/* if we have a scheduler we can start the task */
if (GST_ELEMENT_SCHEDULER (queue)) {
GST_STREAM_LOCK (pad);
GST_RPAD_TASK (pad) =
gst_scheduler_create_task (GST_ELEMENT_SCHEDULER (queue),
(GstTaskFunction) gst_queue_loop, pad);
gst_task_start (GST_RPAD_TASK (pad));
GST_STREAM_UNLOCK (pad);
result = TRUE;
}
} else {
/* step 1, unblock chain and loop functions */
queue->interrupt = TRUE;
g_cond_signal (queue->item_add);
g_cond_signal (queue->item_del);
/* step 2, make sure streaming finishes */
GST_STREAM_LOCK (pad);
/* step 3, stop the task */
gst_task_stop (GST_RPAD_TASK (pad));
gst_object_unref (GST_OBJECT (GST_RPAD_TASK (pad)));
GST_STREAM_UNLOCK (pad);
result = TRUE;
}
return result;
}
static GstElementStateReturn
gst_queue_change_state (GstElement * element)
{
GstQueue *queue;
GstElementStateReturn ret = GST_STATE_SUCCESS;
queue = GST_QUEUE (element);
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "starting state change");
/* lock the queue so another thread (not in sync with this thread's state)
* can't call this queue's _loop (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_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
queue->interrupt = FALSE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_queue_locked_flush (queue);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
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;
}
}