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gstreamer/plugins/elements/gstqueue.c
Sebastian Dröge 0c6afcbeb2 queue: Only unblock upstream waiting for the query once downstream is finished 
... when flushing and deactivating pads. Otherwise downstream might have a
query that was already unreffed by upstream, causing crashes or other
interesting effects.

https://bugzilla.gnome.org/show_bug.cgi?id=763496
2016-05-20 09:04:45 +03:00

1869 lines
61 KiB
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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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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"
#include "../../gst/glib-compat-private.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, \
gst_queue_array_get_length (queue->queue))
/* Queue signals and args */
enum
{
SIGNAL_UNDERRUN,
SIGNAL_RUNNING,
SIGNAL_OVERRUN,
SIGNAL_PUSHING,
LAST_SIGNAL
};
enum
{
PROP_0,
/* FIXME: don't we have another way of doing this
* "Gstreamer format" (frame/byte/time) queries? */
PROP_CUR_LEVEL_BUFFERS,
PROP_CUR_LEVEL_BYTES,
PROP_CUR_LEVEL_TIME,
PROP_MAX_SIZE_BUFFERS,
PROP_MAX_SIZE_BYTES,
PROP_MAX_SIZE_TIME,
PROP_MIN_THRESHOLD_BUFFERS,
PROP_MIN_THRESHOLD_BYTES,
PROP_MIN_THRESHOLD_TIME,
PROP_LEAKY,
PROP_SILENT,
PROP_FLUSH_ON_EOS
};
/* 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"); \
q->waiting_del = TRUE; \
g_cond_wait (&q->item_del, &q->qlock); \
q->waiting_del = FALSE; \
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"); \
q->waiting_add = TRUE; \
g_cond_wait (&q->item_add, &q->qlock); \
q->waiting_add = FALSE; \
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 { \
if (q->waiting_del) { \
STATUS (q, q->srcpad, "signal DEL"); \
g_cond_signal (&q->item_del); \
} \
} G_STMT_END
#define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \
if (q->waiting_add) { \
STATUS (q, q->sinkpad, "signal ADD"); \
g_cond_signal (&q->item_add); \
} \
} G_STMT_END
#define _do_init \
GST_DEBUG_CATEGORY_INIT (queue_debug, "queue", 0, "queue element"); \
GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0, \
"dataflow inside the queue element");
#define gst_queue_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstQueue, gst_queue, 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, GstObject * parent,
GstBuffer * buffer);
static GstFlowReturn gst_queue_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * buffer_list);
static GstFlowReturn gst_queue_push_one (GstQueue * queue);
static void gst_queue_loop (GstPad * pad);
static GstFlowReturn gst_queue_handle_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_queue_handle_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_queue_handle_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_queue_handle_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_queue_locked_flush (GstQueue * queue, gboolean full);
static gboolean gst_queue_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active);
static gboolean gst_queue_sink_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active);
static gboolean gst_queue_is_empty (GstQueue * queue);
static gboolean gst_queue_is_filled (GstQueue * queue);
typedef struct
{
GstMiniObject *item;
gsize size;
gboolean is_query;
} GstQueueItem;
#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_class_init (GstQueueClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_queue_set_property;
gobject_class->get_property = 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, PROP_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, PROP_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, PROP_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, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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 | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
/**
* GstQueue:silent
*
* Don't emit queue signals. Makes queues more lightweight if no signals are
* needed.
*/
g_object_class_install_property (gobject_class, PROP_SILENT,
g_param_spec_boolean ("silent", "Silent",
"Don't emit queue signals", FALSE,
G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
/**
* GstQueue:flush-on-eos
*
* Discard all data in the queue when an EOS event is received, and pass
* on the EOS event as soon as possible (instead of waiting until all
* buffers in the queue have been processed, which is the default behaviour).
*
* Flushing the queue on EOS might be useful when capturing and encoding
* from a live source, to finish up the recording quickly in cases when
* the encoder is slow. Note that this might mean some data from the end of
* the recording data might be lost though (never more than the configured
* max. sizes though).
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_FLUSH_ON_EOS,
g_param_spec_boolean ("flush-on-eos", "Flush on EOS",
"Discard all data in the queue when an EOS event is received", FALSE,
G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
gobject_class->finalize = gst_queue_finalize;
gst_element_class_set_static_metadata (gstelement_class,
"Queue",
"Generic", "Simple data queue", "Erik Walthinsen <omega@cse.ogi.edu>");
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
/* Registering debug symbols for function pointers */
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_src_activate_mode);
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_sink_event);
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_sink_query);
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_src_event);
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_src_query);
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_chain);
GST_DEBUG_REGISTER_FUNCPTR (gst_queue_chain_list);
}
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_queue_chain);
gst_pad_set_chain_list_function (queue->sinkpad, gst_queue_chain_list);
gst_pad_set_activatemode_function (queue->sinkpad,
gst_queue_sink_activate_mode);
gst_pad_set_event_full_function (queue->sinkpad, gst_queue_handle_sink_event);
gst_pad_set_query_function (queue->sinkpad, gst_queue_handle_sink_query);
GST_PAD_SET_PROXY_CAPS (queue->sinkpad);
gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
queue->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_activatemode_function (queue->srcpad,
gst_queue_src_activate_mode);
gst_pad_set_event_function (queue->srcpad, gst_queue_handle_src_event);
gst_pad_set_query_function (queue->srcpad, gst_queue_handle_src_query);
GST_PAD_SET_PROXY_CAPS (queue->srcpad);
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_FLUSHING;
g_mutex_init (&queue->qlock);
g_cond_init (&queue->item_add);
g_cond_init (&queue->item_del);
g_cond_init (&queue->query_handled);
queue->queue =
gst_queue_array_new_for_struct (sizeof (GstQueueItem),
DEFAULT_MAX_SIZE_BUFFERS * 3 / 2);
queue->sinktime = GST_CLOCK_STIME_NONE;
queue->srctime = GST_CLOCK_STIME_NONE;
queue->sink_tainted = TRUE;
queue->src_tainted = TRUE;
queue->newseg_applied_to_src = FALSE;
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);
GstQueueItem *qitem;
GST_DEBUG_OBJECT (queue, "finalizing queue");
while ((qitem = gst_queue_array_pop_head_struct (queue->queue))) {
/* FIXME: if it's a query, shouldn't we unref that too? */
if (!qitem->is_query)
gst_mini_object_unref (qitem->item);
}
gst_queue_array_free (queue->queue);
g_mutex_clear (&queue->qlock);
g_cond_clear (&queue->item_add);
g_cond_clear (&queue->item_del);
g_cond_clear (&queue->query_handled);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* Convenience function */
static inline GstClockTimeDiff
my_segment_to_running_time (GstSegment * segment, GstClockTime val)
{
GstClockTimeDiff res = GST_CLOCK_STIME_NONE;
if (GST_CLOCK_TIME_IS_VALID (val)) {
gboolean sign =
gst_segment_to_running_time_full (segment, GST_FORMAT_TIME, val, &val);
if (sign > 0)
res = val;
else if (sign < 0)
res = -val;
}
return res;
}
/* 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;
if (queue->sink_tainted) {
GST_LOG_OBJECT (queue, "update sink time");
queue->sinktime =
my_segment_to_running_time (&queue->sink_segment,
queue->sink_segment.position);
queue->sink_tainted = FALSE;
}
sink_time = queue->sinktime;
if (queue->src_tainted) {
GST_LOG_OBJECT (queue, "update src time");
queue->srctime =
my_segment_to_running_time (&queue->src_segment,
queue->src_segment.position);
queue->src_tainted = FALSE;
}
src_time = queue->srctime;
GST_LOG_OBJECT (queue, "sink %" GST_STIME_FORMAT ", src %" GST_STIME_FORMAT,
GST_STIME_ARGS (sink_time), GST_STIME_ARGS (src_time));
if (sink_time >= src_time)
queue->cur_level.time = sink_time - src_time;
else
queue->cur_level.time = 0;
}
/* take a SEGMENT event and apply the values to segment, updating the time
* level of queue. */
static void
apply_segment (GstQueue * queue, GstEvent * event, GstSegment * segment,
gboolean sink)
{
gst_event_copy_segment (event, segment);
/* now configure the values, we use these to track timestamps on the
* sinkpad. */
if (segment->format != GST_FORMAT_TIME) {
/* non-time format, pretent the current time segment is closed with a
* 0 start and unknown stop time. */
segment->format = GST_FORMAT_TIME;
segment->start = 0;
segment->stop = -1;
segment->time = 0;
}
if (sink)
queue->sink_tainted = TRUE;
else
queue->src_tainted = TRUE;
GST_DEBUG_OBJECT (queue, "configured SEGMENT %" GST_SEGMENT_FORMAT, segment);
/* segment can update the time level of the queue */
update_time_level (queue);
}
static void
apply_gap (GstQueue * queue, GstEvent * event,
GstSegment * segment, gboolean is_sink)
{
GstClockTime timestamp;
GstClockTime duration;
gst_event_parse_gap (event, &timestamp, &duration);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
if (GST_CLOCK_TIME_IS_VALID (duration)) {
timestamp += duration;
}
segment->position = timestamp;
if (is_sink)
queue->sink_tainted = TRUE;
else
queue->src_tainted = TRUE;
/* calc diff with other end */
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 sink)
{
GstClockTime duration, timestamp;
timestamp = GST_BUFFER_DTS_OR_PTS (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->position;
/* add duration */
if (duration != GST_CLOCK_TIME_NONE)
timestamp += duration;
GST_LOG_OBJECT (queue, "%s position updated to %" GST_TIME_FORMAT,
segment == &queue->sink_segment ? "sink" : "src",
GST_TIME_ARGS (timestamp));
segment->position = timestamp;
if (sink)
queue->sink_tainted = TRUE;
else
queue->src_tainted = TRUE;
/* calc diff with other end */
update_time_level (queue);
}
static gboolean
buffer_list_apply_time (GstBuffer ** buf, guint idx, gpointer user_data)
{
GstClockTime *timestamp = user_data;
GstClockTime btime;
GST_TRACE ("buffer %u has pts %" GST_TIME_FORMAT " dts %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT, idx, GST_TIME_ARGS (GST_BUFFER_DTS (*buf)),
GST_TIME_ARGS (GST_BUFFER_PTS (*buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (*buf)));
btime = GST_BUFFER_DTS_OR_PTS (*buf);
if (GST_CLOCK_TIME_IS_VALID (btime))
*timestamp = btime;
if (GST_BUFFER_DURATION_IS_VALID (*buf))
*timestamp += GST_BUFFER_DURATION (*buf);
GST_TRACE ("ts now %" GST_TIME_FORMAT, GST_TIME_ARGS (*timestamp));
return TRUE;
}
/* take a buffer list and update segment, updating the time level of the queue */
static void
apply_buffer_list (GstQueue * queue, GstBufferList * buffer_list,
GstSegment * segment, gboolean sink)
{
GstClockTime timestamp;
/* if no timestamp is set, assume it's continuous with the previous time */
timestamp = segment->position;
gst_buffer_list_foreach (buffer_list, buffer_list_apply_time, &timestamp);
GST_DEBUG_OBJECT (queue, "position updated to %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
segment->position = timestamp;
if (sink)
queue->sink_tainted = TRUE;
else
queue->src_tainted = TRUE;
/* calc diff with other end */
update_time_level (queue);
}
static void
gst_queue_locked_flush (GstQueue * queue, gboolean full)
{
GstQueueItem *qitem;
while ((qitem = gst_queue_array_pop_head_struct (queue->queue))) {
/* Then lose another reference because we are supposed to destroy that
data when flushing */
if (!full && !qitem->is_query && GST_IS_EVENT (qitem->item)
&& GST_EVENT_IS_STICKY (qitem->item)
&& GST_EVENT_TYPE (qitem->item) != GST_EVENT_SEGMENT
&& GST_EVENT_TYPE (qitem->item) != GST_EVENT_EOS) {
gst_pad_store_sticky_event (queue->srcpad, GST_EVENT_CAST (qitem->item));
}
if (!qitem->is_query)
gst_mini_object_unref (qitem->item);
memset (qitem, 0, sizeof (GstQueueItem));
}
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
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;
queue->sinktime = queue->srctime = GST_CLOCK_STIME_NONE;
queue->sink_tainted = queue->src_tainted = TRUE;
/* we deleted a lot of something */
GST_QUEUE_SIGNAL_DEL (queue);
}
/* enqueue an item an update the level stats, with QUEUE_LOCK */
static inline void
gst_queue_locked_enqueue_buffer (GstQueue * queue, gpointer item)
{
GstQueueItem qitem;
GstBuffer *buffer = GST_BUFFER_CAST (item);
gsize bsize = gst_buffer_get_size (buffer);
/* add buffer to the statistics */
queue->cur_level.buffers++;
queue->cur_level.bytes += bsize;
apply_buffer (queue, buffer, &queue->sink_segment, TRUE);
qitem.item = item;
qitem.is_query = FALSE;
qitem.size = bsize;
gst_queue_array_push_tail_struct (queue->queue, &qitem);
GST_QUEUE_SIGNAL_ADD (queue);
}
static gboolean
buffer_list_calc_size (GstBuffer ** buf, guint idx, gpointer data)
{
guint *p_size = data;
gsize buf_size;
buf_size = gst_buffer_get_size (*buf);
GST_TRACE ("buffer %u in has size %" G_GSIZE_FORMAT, idx, buf_size);
*p_size += buf_size;
return TRUE;
}
static inline void
gst_queue_locked_enqueue_buffer_list (GstQueue * queue, gpointer item)
{
GstQueueItem qitem;
GstBufferList *buffer_list = GST_BUFFER_LIST_CAST (item);
gsize bsize = 0;
gst_buffer_list_foreach (buffer_list, buffer_list_calc_size, &bsize);
/* add buffer to the statistics */
queue->cur_level.buffers += gst_buffer_list_length (buffer_list);
queue->cur_level.bytes += bsize;
apply_buffer_list (queue, buffer_list, &queue->sink_segment, TRUE);
qitem.item = item;
qitem.is_query = FALSE;
qitem.size = bsize;
gst_queue_array_push_tail_struct (queue->queue, &qitem);
GST_QUEUE_SIGNAL_ADD (queue);
}
static inline void
gst_queue_locked_enqueue_event (GstQueue * queue, gpointer item)
{
GstQueueItem qitem;
GstEvent *event = GST_EVENT_CAST (item);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from upstream");
/* Zero the thresholds, this makes sure the queue is completely
* filled and we can read all data from the queue. */
if (queue->flush_on_eos)
gst_queue_locked_flush (queue, FALSE);
else
GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
/* mark the queue as EOS. This prevents us from accepting more data. */
queue->eos = TRUE;
break;
case GST_EVENT_SEGMENT:
apply_segment (queue, event, &queue->sink_segment, TRUE);
/* if the queue is empty, apply sink segment on the source */
if (gst_queue_array_is_empty (queue->queue)) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "Apply segment on srcpad");
apply_segment (queue, event, &queue->src_segment, FALSE);
queue->newseg_applied_to_src = TRUE;
}
/* a new segment allows us to accept more buffers if we got EOS
* from downstream */
queue->unexpected = FALSE;
break;
case GST_EVENT_GAP:
apply_gap (queue, event, &queue->sink_segment, TRUE);
break;
default:
break;
}
qitem.item = item;
qitem.is_query = FALSE;
qitem.size = 0;
gst_queue_array_push_tail_struct (queue->queue, &qitem);
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)
{
GstQueueItem *qitem;
GstMiniObject *item;
gsize bufsize;
qitem = gst_queue_array_pop_head_struct (queue->queue);
if (qitem == NULL)
goto no_item;
item = qitem->item;
bufsize = qitem->size;
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 -= bufsize;
apply_buffer (queue, buffer, &queue->src_segment, FALSE);
/* 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_BUFFER_LIST (item)) {
GstBufferList *buffer_list = GST_BUFFER_LIST_CAST (item);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved buffer list %p from queue", buffer_list);
queue->cur_level.buffers -= gst_buffer_list_length (buffer_list);
queue->cur_level.bytes -= bufsize;
apply_buffer_list (queue, buffer_list, &queue->src_segment, FALSE);
/* 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_SEGMENT:
/* apply newsegment if it has not already been applied */
if (G_LIKELY (!queue->newseg_applied_to_src)) {
apply_segment (queue, event, &queue->src_segment, FALSE);
} else {
queue->newseg_applied_to_src = FALSE;
}
break;
case GST_EVENT_GAP:
apply_gap (queue, event, &queue->src_segment, FALSE);
break;
default:
break;
}
} else if (GST_IS_QUERY (item)) {
GstQuery *query = GST_QUERY_CAST (item);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved query %p from queue", query);
} 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 GstFlowReturn
gst_queue_handle_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean ret = TRUE;
GstQueue *queue;
queue = GST_QUEUE (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
STATUS (queue, pad, "received flush start event");
/* forward event */
ret = gst_pad_push_event (queue->srcpad, event);
/* now unblock the chain function */
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_FLUSHING;
/* 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");
/* unblock query handler after the streaming thread is shut down.
* Otherwise downstream might have a query that is already unreffed
* upstream */
GST_QUEUE_MUTEX_LOCK (queue);
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
GST_QUEUE_MUTEX_UNLOCK (queue);
break;
case GST_EVENT_FLUSH_STOP:
STATUS (queue, pad, "received flush stop event");
/* forward event */
ret = gst_pad_push_event (queue->srcpad, event);
GST_QUEUE_MUTEX_LOCK (queue);
gst_queue_locked_flush (queue, FALSE);
queue->srcresult = GST_FLOW_OK;
queue->eos = FALSE;
queue->unexpected = FALSE;
if (gst_pad_is_active (queue->srcpad)) {
gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
queue->srcpad, NULL);
} else {
GST_INFO_OBJECT (queue->srcpad, "not re-starting task on srcpad, "
"pad not active any longer");
}
GST_QUEUE_MUTEX_UNLOCK (queue);
STATUS (queue, pad, "after flush");
break;
default:
if (GST_EVENT_IS_SERIALIZED (event)) {
/* serialized events go in the queue */
GST_QUEUE_MUTEX_LOCK (queue);
if (queue->srcresult != GST_FLOW_OK) {
/* Errors in sticky event pushing are no problem and ignored here
* as they will cause more meaningful errors during data flow.
* For EOS events, that are not followed by data flow, we still
* return FALSE here though and report an error.
*/
if (!GST_EVENT_IS_STICKY (event)) {
GST_QUEUE_MUTEX_UNLOCK (queue);
goto out_flow_error;
} else if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
if (queue->srcresult == GST_FLOW_NOT_LINKED
|| queue->srcresult < GST_FLOW_EOS) {
GST_QUEUE_MUTEX_UNLOCK (queue);
GST_ELEMENT_ERROR (queue, STREAM, FAILED,
(_("Internal data flow error.")),
("streaming task paused, reason %s (%d)",
gst_flow_get_name (queue->srcresult), queue->srcresult));
} else {
GST_QUEUE_MUTEX_UNLOCK (queue);
}
goto out_flow_error;
}
}
/* refuse more events on EOS */
if (queue->eos)
goto out_eos;
gst_queue_locked_enqueue_event (queue, event);
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* non-serialized events are forwarded downstream immediately */
ret = gst_pad_push_event (queue->srcpad, event);
}
break;
}
if (ret == FALSE)
return GST_FLOW_ERROR;
return GST_FLOW_OK;
/* ERRORS */
out_eos:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "refusing event, we are EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_event_unref (event);
return GST_FLOW_EOS;
}
out_flow_error:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"refusing event, we have a downstream flow error: %s",
gst_flow_get_name (queue->srcresult));
gst_event_unref (event);
return queue->srcresult;
}
}
static gboolean
gst_queue_handle_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstQueue *queue = GST_QUEUE_CAST (parent);
gboolean res;
switch (GST_QUERY_TYPE (query)) {
default:
if (G_UNLIKELY (GST_QUERY_IS_SERIALIZED (query))) {
GstQueueItem qitem;
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
GST_LOG_OBJECT (queue, "queuing query %p (%s)", query,
GST_QUERY_TYPE_NAME (query));
qitem.item = GST_MINI_OBJECT_CAST (query);
qitem.is_query = TRUE;
qitem.size = 0;
gst_queue_array_push_tail_struct (queue->queue, &qitem);
GST_QUEUE_SIGNAL_ADD (queue);
g_cond_wait (&queue->query_handled, &queue->qlock);
if (queue->srcresult != GST_FLOW_OK)
goto out_flushing;
res = queue->last_query;
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
res = gst_pad_query_default (pad, parent, query);
}
break;
}
return res;
/* ERRORS */
out_flushing:
{
GST_DEBUG_OBJECT (queue, "we are flushing");
GST_QUEUE_MUTEX_UNLOCK (queue);
return FALSE;
}
}
static gboolean
gst_queue_is_empty (GstQueue * queue)
{
GstQueueItem *head;
head = gst_queue_array_peek_head_struct (queue->queue);
if (head == NULL)
return TRUE;
/* Only consider the queue empty if the minimum thresholds
* are not reached and data is at the queue head. Otherwise
* we would block forever on serialized queries.
*/
if (!GST_IS_BUFFER (head->item) && !GST_IS_BUFFER_LIST (head->item))
return FALSE;
/* It is possible that a max size is reached before all min thresholds are.
* Therefore, only consider it empty if it is not filled. */
return ((queue->min_threshold.buffers > 0 &&
queue->cur_level.buffers < queue->min_threshold.buffers) ||
(queue->min_threshold.bytes > 0 &&
queue->cur_level.bytes < queue->min_threshold.bytes) ||
(queue->min_threshold.time > 0 &&
queue->cur_level.time < queue->min_threshold.time)) &&
!gst_queue_is_filled (queue);
}
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);
if (GST_IS_EVENT (leak) && GST_EVENT_IS_STICKY (leak)) {
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"Storing sticky event %s on srcpad", GST_EVENT_TYPE_NAME (leak));
gst_pad_store_sticky_event (queue->srcpad, GST_EVENT_CAST (leak));
}
if (!GST_IS_QUERY (leak))
gst_mini_object_unref (leak);
/* last buffer needs to get a DISCONT flag */
queue->head_needs_discont = TRUE;
}
}
static gboolean
discont_first_buffer (GstBuffer ** buffer, guint i, gpointer user_data)
{
GstQueue *queue = user_data;
GstBuffer *subbuffer = gst_buffer_make_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");
}
return FALSE;
}
static GstFlowReturn
gst_queue_chain_buffer_or_list (GstPad * pad, GstObject * parent,
GstMiniObject * obj, gboolean is_list)
{
GstQueue *queue;
queue = GST_QUEUE_CAST (parent);
/* 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;
if (!is_list) {
GstClockTime duration, timestamp;
GstBuffer *buffer = GST_BUFFER_CAST (obj);
timestamp = GST_BUFFER_DTS_OR_PTS (buffer);
duration = GST_BUFFER_DURATION (buffer);
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received buffer %p of size %"
G_GSIZE_FORMAT ", time %" GST_TIME_FORMAT ", duration %"
GST_TIME_FORMAT, buffer, gst_buffer_get_size (buffer),
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
} else {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"received buffer list %p with %u buffers", obj,
gst_buffer_list_length (GST_BUFFER_LIST_CAST (obj)));
}
/* 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)) {
if (!queue->silent) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (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");
if (!queue->silent) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (queue, gst_queue_signals[SIGNAL_RUNNING], 0);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
}
break;
}
}
}
if (queue->tail_needs_discont) {
if (!is_list) {
GstBuffer *buffer = GST_BUFFER_CAST (obj);
GstBuffer *subbuffer = gst_buffer_make_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");
}
obj = GST_MINI_OBJECT_CAST (buffer);
} else {
GstBufferList *buffer_list = GST_BUFFER_LIST_CAST (obj);
buffer_list = gst_buffer_list_make_writable (buffer_list);
gst_buffer_list_foreach (buffer_list, discont_first_buffer, queue);
obj = GST_MINI_OBJECT_CAST (buffer_list);
}
queue->tail_needs_discont = FALSE;
}
/* put buffer in queue now */
if (is_list)
gst_queue_locked_enqueue_buffer_list (queue, obj);
else
gst_queue_locked_enqueue_buffer (queue, obj);
GST_QUEUE_MUTEX_UNLOCK (queue);
return GST_FLOW_OK;
/* special conditions */
out_unref:
{
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_mini_object_unref (obj);
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_mini_object_unref (obj);
return ret;
}
out_eos:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_mini_object_unref (obj);
return GST_FLOW_EOS;
}
out_unexpected:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_mini_object_unref (obj);
return GST_FLOW_EOS;
}
}
static GstFlowReturn
gst_queue_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * buffer_list)
{
return gst_queue_chain_buffer_or_list (pad, parent,
GST_MINI_OBJECT_CAST (buffer_list), TRUE);
}
static GstFlowReturn
gst_queue_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
return gst_queue_chain_buffer_or_list (pad, parent,
GST_MINI_OBJECT_CAST (buffer), FALSE);
}
/* 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 = queue->srcresult;
GstMiniObject *data;
gboolean is_list;
data = gst_queue_locked_dequeue (queue);
if (data == NULL)
goto no_item;
next:
is_list = GST_IS_BUFFER_LIST (data);
if (GST_IS_BUFFER (data) || is_list) {
if (!is_list) {
GstBuffer *buffer;
buffer = GST_BUFFER_CAST (data);
if (queue->head_needs_discont) {
GstBuffer *subbuffer = gst_buffer_make_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);
result = gst_pad_push (queue->srcpad, buffer);
} else {
GstBufferList *buffer_list;
buffer_list = GST_BUFFER_LIST_CAST (data);
if (queue->head_needs_discont) {
buffer_list = gst_buffer_list_make_writable (buffer_list);
gst_buffer_list_foreach (buffer_list, discont_first_buffer, queue);
queue->head_needs_discont = FALSE;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
result = gst_pad_push_list (queue->srcpad, buffer_list);
}
/* need to check for srcresult here as well */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
if (result == GST_FLOW_EOS) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from downstream");
/* stop pushing buffers, we dequeue all items until we see an item that we
* can push again, which is EOS or SEGMENT. If there is nothing in the
* queue we can push, we set a flag to make the sinkpad refuse more
* buffers with an EOS return value. */
while ((data = gst_queue_locked_dequeue (queue))) {
if (GST_IS_BUFFER (data)) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping EOS buffer %p", data);
gst_buffer_unref (GST_BUFFER_CAST (data));
} else if (GST_IS_BUFFER_LIST (data)) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping EOS buffer list %p", data);
gst_buffer_list_unref (GST_BUFFER_LIST_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_SEGMENT) {
/* we found a pushable item in the queue, push it out */
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pushing pushable event %s after EOS",
GST_EVENT_TYPE_NAME (event));
goto next;
}
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping EOS event %p", event);
gst_event_unref (event);
} else if (GST_IS_QUERY (data)) {
GstQuery *query = GST_QUERY_CAST (data);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping query %p because of EOS", query);
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
}
}
/* 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 SEGMENT 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 EOS so that the task pauses. */
if (type == GST_EVENT_EOS) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pushed EOS event %p, return EOS", event);
result = GST_FLOW_EOS;
}
} else if (GST_IS_QUERY (data)) {
GstQuery *query = GST_QUERY_CAST (data);
gboolean ret;
GST_QUEUE_MUTEX_UNLOCK (queue);
ret = gst_pad_peer_query (queue->srcpad, query);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing_query);
queue->last_query = ret;
g_cond_signal (&queue->query_handled);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"did query %p, return %d", query, queue->last_query);
}
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_FLUSHING;
}
out_flushing_query:
{
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we are flushing");
return GST_FLOW_FLUSHING;
}
}
static void
gst_queue_loop (GstPad * pad)
{
GstQueue *queue;
GstFlowReturn ret;
queue = (GstQueue *) 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_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is empty");
if (!queue->silent) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (queue, gst_queue_signals[SIGNAL_UNDERRUN], 0);
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_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not empty");
if (!queue->silent) {
GST_QUEUE_MUTEX_UNLOCK (queue);
g_signal_emit (queue, gst_queue_signals[SIGNAL_RUNNING], 0);
g_signal_emit (queue, gst_queue_signals[SIGNAL_PUSHING], 0);
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:
{
gboolean eos = queue->eos;
GstFlowReturn ret = queue->srcresult;
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pause task, reason: %s", gst_flow_get_name (ret));
if (ret == GST_FLOW_FLUSHING) {
gst_queue_locked_flush (queue, FALSE);
} else {
GST_QUEUE_SIGNAL_DEL (queue);
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
}
GST_QUEUE_MUTEX_UNLOCK (queue);
/* let app know about us giving up if upstream is not expected to do so */
/* EOS is already taken care of elsewhere */
if (eos && (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS)) {
GST_ELEMENT_ERROR (queue, STREAM, FAILED,
(_("Internal data flow error.")),
("streaming task paused, reason %s (%d)",
gst_flow_get_name (ret), ret));
gst_pad_push_event (queue->srcpad, gst_event_new_eos ());
}
return;
}
}
static gboolean
gst_queue_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res = TRUE;
GstQueue *queue = GST_QUEUE (parent);
#ifndef GST_DISABLE_GST_DEBUG
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%d)",
event, GST_EVENT_TYPE (event));
#endif
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_RECONFIGURE:
GST_QUEUE_MUTEX_LOCK (queue);
if (queue->srcresult == GST_FLOW_NOT_LINKED) {
/* when we got not linked, assume downstream is linked again now and we
* can try to start pushing again */
queue->srcresult = GST_FLOW_OK;
gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad, NULL);
}
GST_QUEUE_MUTEX_UNLOCK (queue);
res = gst_pad_push_event (queue->sinkpad, event);
break;
default:
res = gst_pad_event_default (pad, parent, event);
break;
}
return res;
}
static gboolean
gst_queue_handle_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstQueue *queue = GST_QUEUE (parent);
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_SCHEDULING:{
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
if (!res)
return FALSE;
/* Adjust peer response for data contained in queue */
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. */
/* TODO: Use CONVERT query? */
if (queue->max_size.time > 0 && max != -1
&& queue->leaky == GST_QUEUE_NO_LEAK)
max += queue->max_size.time;
else if (queue->max_size.time > 0 && queue->leaky != GST_QUEUE_NO_LEAK)
max = MIN (queue->max_size.time, max);
else
max = -1;
/* adjust for min-threshold */
if (queue->min_threshold.time > 0)
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_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
gboolean active)
{
gboolean result;
GstQueue *queue;
queue = GST_QUEUE (parent);
switch (mode) {
case GST_PAD_MODE_PUSH:
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_FLUSHING;
/* the item del signal will unblock */
GST_QUEUE_SIGNAL_DEL (queue);
GST_QUEUE_MUTEX_UNLOCK (queue);
/* step 2, wait until streaming thread stopped and flush queue */
GST_PAD_STREAM_LOCK (pad);
GST_QUEUE_MUTEX_LOCK (queue);
gst_queue_locked_flush (queue, TRUE);
GST_QUEUE_MUTEX_UNLOCK (queue);
GST_PAD_STREAM_UNLOCK (pad);
}
result = TRUE;
break;
default:
result = FALSE;
break;
}
return result;
}
static gboolean
gst_queue_src_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
gboolean active)
{
gboolean result;
GstQueue *queue;
queue = GST_QUEUE (parent);
switch (mode) {
case GST_PAD_MODE_PUSH:
if (active) {
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_OK;
queue->eos = FALSE;
queue->unexpected = FALSE;
result =
gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad,
NULL);
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* step 1, unblock loop function */
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_FLUSHING;
/* 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);
}
break;
default:
result = FALSE;
break;
}
return result;
}
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 PROP_MAX_SIZE_BYTES:
queue->max_size.bytes = g_value_get_uint (value);
queue_capacity_change (queue);
break;
case PROP_MAX_SIZE_BUFFERS:
queue->max_size.buffers = g_value_get_uint (value);
queue_capacity_change (queue);
break;
case PROP_MAX_SIZE_TIME:
queue->max_size.time = g_value_get_uint64 (value);
queue_capacity_change (queue);
break;
case PROP_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 PROP_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 PROP_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 PROP_LEAKY:
queue->leaky = g_value_get_enum (value);
break;
case PROP_SILENT:
queue->silent = g_value_get_boolean (value);
break;
case PROP_FLUSH_ON_EOS:
queue->flush_on_eos = g_value_get_boolean (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 PROP_CUR_LEVEL_BYTES:
g_value_set_uint (value, queue->cur_level.bytes);
break;
case PROP_CUR_LEVEL_BUFFERS:
g_value_set_uint (value, queue->cur_level.buffers);
break;
case PROP_CUR_LEVEL_TIME:
g_value_set_uint64 (value, queue->cur_level.time);
break;
case PROP_MAX_SIZE_BYTES:
g_value_set_uint (value, queue->max_size.bytes);
break;
case PROP_MAX_SIZE_BUFFERS:
g_value_set_uint (value, queue->max_size.buffers);
break;
case PROP_MAX_SIZE_TIME:
g_value_set_uint64 (value, queue->max_size.time);
break;
case PROP_MIN_THRESHOLD_BYTES:
g_value_set_uint (value, queue->min_threshold.bytes);
break;
case PROP_MIN_THRESHOLD_BUFFERS:
g_value_set_uint (value, queue->min_threshold.buffers);
break;
case PROP_MIN_THRESHOLD_TIME:
g_value_set_uint64 (value, queue->min_threshold.time);
break;
case PROP_LEAKY:
g_value_set_enum (value, queue->leaky);
break;
case PROP_SILENT:
g_value_set_boolean (value, queue->silent);
break;
case PROP_FLUSH_ON_EOS:
g_value_set_boolean (value, queue->flush_on_eos);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
}
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