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gstreamer/plugins/elements/gstqueue.c
Jan Schmidt 18e2042e28 plugins/elements/gstqueue.c: Allow through queries when we don't know how as otherwise it's not possible to query the... 
Original commit message from CVS:
* plugins/elements/gstqueue.c:
Allow through queries when we don't know how
to adjust them (not TIME or BYTES), as otherwise it's
not possible to query the current position in order
to seek in other formats at all.
2008-10-08 11:20:17 +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
*
* 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 items", \
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)
/* Queue signals and args */
enum
{
SIGNAL_UNDERRUN,
SIGNAL_RUNNING,
SIGNAL_OVERRUN,
SIGNAL_PUSHING,
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 { \
g_mutex_lock (q->qlock); \
} 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 { \
g_mutex_unlock (q->qlock); \
} G_STMT_END
#define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START { \
STATUS (q, q->sinkpad, "wait for DEL"); \
g_cond_wait (q->item_del, q->qlock); \
if (q->srcresult != GST_FLOW_OK) { \
STATUS (q, q->srcpad, "received DEL wakeup"); \
goto label; \
} \
STATUS (q, q->sinkpad, "received DEL"); \
} G_STMT_END
#define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START { \
STATUS (q, q->srcpad, "wait for ADD"); \
g_cond_wait (q->item_add, q->qlock); \
if (q->srcresult != GST_FLOW_OK) { \
STATUS (q, q->srcpad, "received ADD wakeup"); \
goto label; \
} \
STATUS (q, q->srcpad, "received ADD"); \
} G_STMT_END
#define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START { \
STATUS (q, q->srcpad, "signal DEL"); \
g_cond_signal (q->item_del); \
} G_STMT_END
#define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \
STATUS (q, q->sinkpad, "signal ADD"); \
g_cond_signal (q->item_add); \
} G_STMT_END
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (queue_debug, "queue", 0, "queue element"); \
GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0, \
"dataflow inside the queue element");
GST_BOILERPLATE_FULL (GstQueue, gst_queue, GstElement,
GST_TYPE_ELEMENT, _do_init);
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 GstFlowReturn 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 gboolean gst_queue_acceptcaps (GstPad * pad, GstCaps * caps);
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 guint gst_queue_signals[LAST_SIGNAL] = { 0 };
static void
gst_queue_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (gstelement_class,
"Queue",
"Generic", "Simple data queue", "Erik Walthinsen <omega@cse.ogi.edu>");
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));
}
static void
gst_queue_class_init (GstQueueClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (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);
/**
* GstQueue::pushing:
* @queue: the queue instance
*
* Reports when the queue has enough data to start pushing data again on the
* source pad.
*/
gst_queue_signals[SIGNAL_PUSHING] =
g_signal_new ("pushing", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstQueueClass, pushing), 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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
/* 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, GstQueueClass * g_class)
{
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_acceptcaps_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_acceptcaps));
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);
GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
queue->max_size.buffers = DEFAULT_MAX_SIZE_BUFFERS;
queue->max_size.bytes = DEFAULT_MAX_SIZE_BYTES;
queue->max_size.time = DEFAULT_MAX_SIZE_TIME;
GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
GST_QUEUE_CLEAR_LEVEL (queue->orig_min_threshold);
gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
queue->head_needs_discont = queue->tail_needs_discont = FALSE;
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);
g_mutex_free (queue->qlock);
g_cond_free (queue->item_add);
g_cond_free (queue->item_del);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_queue_acceptcaps (GstPad * pad, GstCaps * caps)
{
gboolean result;
GstQueue *queue;
GstPad *otherpad;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
otherpad = (pad == queue->srcpad ? queue->sinkpad : queue->srcpad);
result = gst_pad_peer_accept_caps (otherpad, caps);
return result;
}
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;
}
/* calculate the diff between running time on the sink and src of the queue.
* This is the total amount of time in the queue. */
static void
update_time_level (GstQueue * queue)
{
gint64 sink_time, src_time;
sink_time =
gst_segment_to_running_time (&queue->sink_segment, GST_FORMAT_TIME,
queue->sink_segment.last_stop);
src_time = gst_segment_to_running_time (&queue->src_segment, GST_FORMAT_TIME,
queue->src_segment.last_stop);
GST_LOG_OBJECT (queue, "sink %" GST_TIME_FORMAT ", src %" GST_TIME_FORMAT,
GST_TIME_ARGS (sink_time), GST_TIME_ARGS (src_time));
if (sink_time >= src_time)
queue->cur_level.time = sink_time - src_time;
else
queue->cur_level.time = 0;
}
/* take a NEWSEGMENT event and apply the values to segment, updating the time
* level of queue. */
static void
apply_segment (GstQueue * queue, GstEvent * event, GstSegment * segment)
{
gboolean update;
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gst_event_parse_new_segment_full (event, &update, &rate, &arate,
&format, &start, &stop, &time);
/* now configure the values, we use these to track timestamps on the
* sinkpad. */
if (format != GST_FORMAT_TIME) {
/* non-time format, pretent the current time segment is closed with a
* 0 start and unknown stop time. */
update = FALSE;
format = GST_FORMAT_TIME;
start = 0;
stop = -1;
time = 0;
}
gst_segment_set_newsegment_full (segment, update,
rate, arate, format, start, stop, time);
GST_DEBUG_OBJECT (queue,
"configured NEWSEGMENT %" GST_SEGMENT_FORMAT, segment);
/* segment can update the time level of the queue */
update_time_level (queue);
}
/* take a buffer and update segment, updating the time level of the queue. */
static void
apply_buffer (GstQueue * queue, GstBuffer * buffer, GstSegment * segment,
gboolean with_duration)
{
GstClockTime duration, timestamp;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
/* if no timestamp is set, assume it's continuous with the previous
* time */
if (timestamp == GST_CLOCK_TIME_NONE)
timestamp = segment->last_stop;
/* add duration */
if (with_duration && duration != GST_CLOCK_TIME_NONE)
timestamp += duration;
GST_LOG_OBJECT (queue, "last_stop updated to %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
gst_segment_set_last_stop (segment, GST_FORMAT_TIME, timestamp);
/* calc diff with other end */
update_time_level (queue);
}
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);
}
GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
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;
gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
queue->head_needs_discont = queue->tail_needs_discont = FALSE;
/* we deleted a lot of something */
GST_QUEUE_SIGNAL_DEL (queue);
}
/* enqueue an item an update the level stats, with QUEUE_LOCK */
static void
gst_queue_locked_enqueue (GstQueue * queue, gpointer item)
{
if (GST_IS_BUFFER (item)) {
GstBuffer *buffer = GST_BUFFER_CAST (item);
/* add buffer to the statistics */
queue->cur_level.buffers++;
queue->cur_level.bytes += GST_BUFFER_SIZE (buffer);
apply_buffer (queue, buffer, &queue->sink_segment, TRUE);
/* if this is the first buffer update the end side as well, but without the
* duration. */
/* FIXME : This will only be useful for current time level if the
* source task is running, which is not the case for ex in
* gstplaybasebin when pre-rolling.
* See #482147 */
/* if (queue->cur_level.buffers == 1) */
/* apply_buffer (queue, buffer, &queue->src_segment, FALSE); */
} else if (GST_IS_EVENT (item)) {
GstEvent *event = GST_EVENT_CAST (item);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
/* Zero the thresholds, this makes sure the queue is completely
* filled and we can read all data from the queue. */
GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
/* mark the queue as EOS. This prevents us from accepting more data. */
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from upstream");
queue->eos = TRUE;
break;
case GST_EVENT_NEWSEGMENT:
apply_segment (queue, event, &queue->sink_segment);
/* a new segment allows us to accept more buffers if we got UNEXPECTED
* from downstream */
queue->unexpected = FALSE;
break;
default:
break;
}
} else {
g_warning ("Unexpected item %p added in queue %s (refcounting problem?)",
item, GST_OBJECT_NAME (queue));
/* we can't really unref since we don't know what it is */
item = NULL;
}
if (item)
g_queue_push_tail (queue->queue, item);
GST_QUEUE_SIGNAL_ADD (queue);
}
/* dequeue an item from the queue and update level stats, with QUEUE_LOCK */
static GstMiniObject *
gst_queue_locked_dequeue (GstQueue * queue)
{
GstMiniObject *item;
item = g_queue_pop_head (queue->queue);
if (item == NULL)
goto no_item;
if (GST_IS_BUFFER (item)) {
GstBuffer *buffer = GST_BUFFER_CAST (item);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved buffer %p from queue", buffer);
queue->cur_level.buffers--;
queue->cur_level.bytes -= GST_BUFFER_SIZE (buffer);
apply_buffer (queue, buffer, &queue->src_segment, TRUE);
/* if the queue is empty now, update the other side */
if (queue->cur_level.buffers == 0)
queue->cur_level.time = 0;
} else if (GST_IS_EVENT (item)) {
GstEvent *event = GST_EVENT_CAST (item);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved event %p from queue", event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
/* queue is empty now that we dequeued the EOS */
GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
break;
case GST_EVENT_NEWSEGMENT:
apply_segment (queue, event, &queue->src_segment);
break;
default:
break;
}
} else {
g_warning
("Unexpected item %p dequeued from queue %s (refcounting problem?)",
item, GST_OBJECT_NAME (queue));
item = NULL;
}
GST_QUEUE_SIGNAL_DEL (queue);
return item;
/* ERRORS */
no_item:
{
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "the queue is empty");
return NULL;
}
}
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_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 */
GST_QUEUE_SIGNAL_ADD (queue);
GST_QUEUE_SIGNAL_DEL (queue);
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;
queue->eos = FALSE;
queue->unexpected = FALSE;
if (gst_pad_is_linked (queue->srcpad)) {
gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
queue->srcpad);
} else {
GST_INFO_OBJECT (queue, "not re-starting task as pad is not linked");
}
GST_QUEUE_MUTEX_UNLOCK (queue);
STATUS (queue, pad, "after flush");
goto done;
}
default:
if (GST_EVENT_IS_SERIALIZED (event)) {
/* serialized events go in the queue */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* refuse more events on EOS */
if (queue->eos)
goto out_eos;
gst_queue_locked_enqueue (queue, event);
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* non-serialized events are passed upstream. */
gst_pad_push_event (queue->srcpad, event);
}
break;
}
done:
return TRUE;
/* ERRORS */
out_flushing:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"refusing event, we are flushing");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (event);
return FALSE;
}
out_eos:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "refusing event, we are EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (event);
return FALSE;
}
}
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 void
gst_queue_leak_downstream (GstQueue * queue)
{
/* for as long as the queue is filled, dequeue an item and discard it */
while (gst_queue_is_filled (queue)) {
GstMiniObject *leak;
leak = gst_queue_locked_dequeue (queue);
/* there is nothing to dequeue and the queue is still filled.. This should
* not happen */
g_assert (leak != NULL);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"queue is full, leaking item %p on downstream end", leak);
gst_buffer_unref (leak);
/* last buffer needs to get a DISCONT flag */
queue->head_needs_discont = TRUE;
}
}
static GstFlowReturn
gst_queue_chain (GstPad * pad, GstBuffer * buffer)
{
GstQueue *queue;
GstClockTime duration, timestamp;
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);
/* when we received EOS, we refuse any more data */
if (queue->eos)
goto out_eos;
if (queue->unexpected)
goto out_unexpected;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"received buffer %p of size %d, time %" GST_TIME_FORMAT ", duration %"
GST_TIME_FORMAT, buffer, GST_BUFFER_SIZE (buffer),
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
/* 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);
/* we recheck, the signal could have changed the thresholds */
if (!gst_queue_is_filled (queue))
break;
/* how are we going to make space for this buffer? */
switch (queue->leaky) {
case GST_QUEUE_LEAK_UPSTREAM:
/* next buffer needs to get a DISCONT flag */
queue->tail_needs_discont = TRUE;
/* leak current buffer */
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;
case GST_QUEUE_LEAK_DOWNSTREAM:
gst_queue_leak_downstream (queue);
break;
default:
g_warning ("Unknown leaky type, using default");
/* fall-through */
case GST_QUEUE_NO_LEAK:
{
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"queue is full, waiting for free space");
/* don't leak. Instead, wait for space to be available */
do {
/* for as long as the queue is filled, wait till an item was deleted. */
GST_QUEUE_WAIT_DEL_CHECK (queue, out_flushing);
} while (gst_queue_is_filled (queue));
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not full");
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;
}
}
}
if (queue->tail_needs_discont) {
GstBuffer *subbuffer = gst_buffer_make_metadata_writable (buffer);
if (subbuffer) {
buffer = subbuffer;
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
} else {
GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
}
queue->tail_needs_discont = FALSE;
}
/* put buffer in queue now */
gst_queue_locked_enqueue (queue, buffer);
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;
}
out_eos:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
out_unexpected:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because we received UNEXPECTED");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
}
/* dequeue an item from the queue an push it downstream. This functions returns
* the result of the push. */
static GstFlowReturn
gst_queue_push_one (GstQueue * queue)
{
GstFlowReturn result = GST_FLOW_OK;
GstMiniObject *data;
data = gst_queue_locked_dequeue (queue);
if (data == NULL)
goto no_item;
next:
if (GST_IS_BUFFER (data)) {
GstBuffer *buffer;
GstCaps *caps;
buffer = GST_BUFFER_CAST (data);
caps = GST_BUFFER_CAPS (buffer);
if (queue->head_needs_discont) {
GstBuffer *subbuffer = gst_buffer_make_metadata_writable (buffer);
if (subbuffer) {
buffer = subbuffer;
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
} else {
GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
}
queue->head_needs_discont = FALSE;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
/* set the right caps on the pad now. We do this before pushing the buffer
* because the pad_push call will check (using acceptcaps) if the buffer can
* be set on the pad, which might fail because this will be propagated
* upstream. Also note that if the buffer has NULL caps, it means that the
* caps did not change, so we don't have to change caps on the pad. */
if (caps && caps != GST_PAD_CAPS (queue->srcpad))
gst_pad_set_caps (queue->srcpad, caps);
result = gst_pad_push (queue->srcpad, buffer);
/* need to check for srcresult here as well */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
if (result == GST_FLOW_UNEXPECTED) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"got UNEXPECTED from downstream");
/* stop pushing buffers, we dequeue all items until we see an item that we
* can push again, which is EOS or NEWSEGMENT. If there is nothing in the
* queue we can push, we set a flag to make the sinkpad refuse more
* buffers with an UNEXPECTED return value. */
while ((data = gst_queue_locked_dequeue (queue))) {
if (GST_IS_BUFFER (data)) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping UNEXPECTED buffer %p", data);
gst_buffer_unref (GST_BUFFER_CAST (data));
} else if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT_CAST (data);
GstEventType type = GST_EVENT_TYPE (event);
if (type == GST_EVENT_EOS || type == GST_EVENT_NEWSEGMENT) {
/* we found a pushable item in the queue, push it out */
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pushing pushable event %s after UNEXPECTED",
GST_EVENT_TYPE_NAME (event));
goto next;
}
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping UNEXPECTED event %p", event);
gst_event_unref (event);
}
}
/* no more items in the queue. Set the unexpected flag so that upstream
* make us refuse any more buffers on the sinkpad. Since we will still
* accept EOS and NEWSEGMENT we return _FLOW_OK to the caller so that the
* task function does not shut down. */
queue->unexpected = TRUE;
result = GST_FLOW_OK;
}
} else if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT_CAST (data);
GstEventType type = GST_EVENT_TYPE (event);
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_pad_push_event (queue->srcpad, event);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* if we're EOS, return UNEXPECTED so that the task pauses. */
if (type == GST_EVENT_EOS) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pushed EOS event %p, return UNEXPECTED", event);
result = GST_FLOW_UNEXPECTED;
}
}
return result;
/* ERRORS */
no_item:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because we have no item in the queue");
return GST_FLOW_ERROR;
}
out_flushing:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we are flushing");
return GST_FLOW_WRONG_STATE;
}
}
static void
gst_queue_loop (GstPad * pad)
{
GstQueue *queue;
GstFlowReturn ret;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
/* have to lock for thread-safety */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
while (gst_queue_is_empty (queue)) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_UNDERRUN], 0);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is empty");
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* we recheck, the signal could have changed the thresholds */
while (gst_queue_is_empty (queue)) {
GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
}
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_PUSHING], 0);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not empty");
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
}
ret = gst_queue_push_one (queue);
queue->srcresult = ret;
if (ret != GST_FLOW_OK)
goto out_flushing;
GST_QUEUE_MUTEX_UNLOCK (queue);
return;
/* ERRORS */
out_flushing:
{
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pause task, reason: %s", gst_flow_get_name (queue->srcresult));
GST_QUEUE_SIGNAL_DEL (queue);
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_DEBUG_OBJECT (queue, "Can't adjust query in %s format, don't "
"know how to adjust value", gst_format_get_name (format));
return TRUE;
}
/* set updated position */
gst_query_set_position (query, format, peer_pos);
break;
}
case GST_QUERY_LATENCY:
{
gboolean live;
GstClockTime min, max;
gst_query_parse_latency (query, &live, &min, &max);
/* we can delay up to the limit of the queue in time. If we have no time
* limit, the best thing we can do is to return an infinite delay. In
* reality a better estimate would be the byte/buffer rate but that is not
* possible right now. */
if (queue->max_size.time > 0 && max != -1)
max += queue->max_size.time;
else
max = -1;
/* adjust for min-threshold */
if (queue->min_threshold.time > 0 && min != -1)
min += queue->min_threshold.time;
gst_query_set_latency (query, live, min, max);
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;
queue->eos = FALSE;
queue->unexpected = FALSE;
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;
queue->eos = FALSE;
queue->unexpected = FALSE;
/* 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_INFO_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;
}
static void
queue_capacity_change (GstQueue * queue)
{
if (queue->leaky == GST_QUEUE_LEAK_DOWNSTREAM) {
gst_queue_leak_downstream (queue);
}
/* 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 */
GST_QUEUE_SIGNAL_DEL (queue);
}
/* 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)\
GST_QUEUE_SIGNAL_ADD (q);
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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