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gstreamer/plugins/elements/gstqueue.c
Sebastian Dröge a941b4651c queue: Wake up the query function on errors from the loop function 
Otherwise we might wait forever for serialized queries to be handled as the
loop function is stopped and as such we will never ever dequeue the query and
handle it.

https://bugzilla.gnome.org/show_bug.cgi?id=745319
2015-03-03 12:49:47 +01:00

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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., 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 gboolean 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
{
gboolean is_query;
GstMiniObject *item;
gsize size;
} 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_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&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_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 (DEFAULT_MAX_SIZE_BUFFERS * 3 / 2);
queue->sinktime = GST_CLOCK_TIME_NONE;
queue->srctime = GST_CLOCK_TIME_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);
GST_DEBUG_OBJECT (queue, "finalizing queue");
while (!gst_queue_array_is_empty (queue->queue)) {
GstQueueItem *qitem = gst_queue_array_pop_head (queue->queue);
/* FIXME: if it's a query, shouldn't we unref that too? */
if (!qitem->is_query)
gst_mini_object_unref (qitem->item);
g_slice_free (GstQueueItem, qitem);
}
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);
}
/* 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 =
gst_segment_to_running_time (&queue->sink_segment, GST_FORMAT_TIME,
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 =
gst_segment_to_running_time (&queue->src_segment, GST_FORMAT_TIME,
queue->src_segment.position);
queue->src_tainted = FALSE;
}
src_time = queue->srctime;
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 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_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->position;
/* add duration */
if (duration != GST_CLOCK_TIME_NONE)
timestamp += duration;
GST_LOG_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 gboolean
buffer_list_apply_time (GstBuffer ** buf, guint idx, gpointer user_data)
{
GstClockTime *timestamp = user_data;
GST_TRACE ("buffer %u has ts %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT, idx,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (*buf)));
if (GST_BUFFER_TIMESTAMP_IS_VALID (*buf))
*timestamp = GST_BUFFER_TIMESTAMP (*buf);
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)
{
while (!gst_queue_array_is_empty (queue->queue)) {
GstQueueItem *qitem = gst_queue_array_pop_head (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);
g_slice_free (GstQueueItem, qitem);
}
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_TIME_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 = g_slice_new (GstQueueItem);
qitem->item = item;
qitem->is_query = FALSE;
qitem->size = bsize;
gst_queue_array_push_tail (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 = g_slice_new (GstQueueItem);
qitem->item = item;
qitem->is_query = FALSE;
qitem->size = bsize;
gst_queue_array_push_tail (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 = g_slice_new (GstQueueItem);
qitem->item = item;
qitem->is_query = FALSE;
gst_queue_array_push_tail (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 (queue->queue);
if (qitem == NULL)
goto no_item;
item = qitem->item;
bufsize = qitem->size;
g_slice_free (GstQueueItem, qitem);
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 gboolean
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);
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
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");
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;
}
return ret;
/* 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 FALSE;
}
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 FALSE;
}
}
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 = g_slice_new (GstQueueItem);
qitem->item = GST_MINI_OBJECT_CAST (query);
qitem->is_query = TRUE;
gst_queue_array_push_tail (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;
if (gst_queue_array_is_empty (queue->queue))
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.
*/
head = gst_queue_array_peek_head (queue->queue);
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_TIMESTAMP (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 */
g_cond_signal (&queue->item_del);
/* unblock query handler */
queue->last_query = FALSE;
g_cond_signal (&queue->query_handled);
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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