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gstreamer/subprojects/gst-plugins-base/gst-libs/gst/app/gstappsink.c
Thibault Saunier 2ccc8051b5 appsink: Signal condition when adding serialized events to the queue 
Users might be waiting on any objects and the appsink should unblock
the waiter and return the object in that case.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5985>
2024-01-27 11:12:59 +00:00

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/* GStreamer
* Copyright (C) 2007 David Schleef <ds@schleef.org>
* (C) 2008 Wim Taymans <wim.taymans@gmail.com>
*
* 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:gstappsink
* @title: GstAppSink
* @short_description: Easy way for applications to extract samples from a
* pipeline
* @see_also: #GstSample, #GstBaseSink, appsrc
*
* Appsink is a sink plugin that supports many different methods for making
* the application get a handle on the GStreamer data in a pipeline. Unlike
* most GStreamer elements, Appsink provides external API functions.
*
* appsink can be used by linking to the gstappsink.h header file to access the
* methods or by using the appsink action signals and properties.
*
* The normal way of retrieving samples from appsink is by using the
* gst_app_sink_pull_sample() and gst_app_sink_pull_preroll() methods.
* These methods block until a sample becomes available in the sink or when the
* sink is shut down or reaches EOS. There are also timed variants of these
* methods, gst_app_sink_try_pull_sample() and gst_app_sink_try_pull_preroll(),
* which accept a timeout parameter to limit the amount of time to wait.
*
* Appsink will internally use a queue to collect buffers from the streaming
* thread. If the application is not pulling samples fast enough, this queue
* will consume a lot of memory over time. The "max-buffers", "max-time" and "max-bytes"
* properties can be used to limit the queue size. The "drop" property controls whether the
* streaming thread blocks or if older buffers are dropped when the maximum
* queue size is reached. Note that blocking the streaming thread can negatively
* affect real-time performance and should be avoided.
*
* If a blocking behaviour is not desirable, setting the "emit-signals" property
* to %TRUE will make appsink emit the "new-sample" and "new-preroll" signals
* when a sample can be pulled without blocking.
*
* The "caps" property on appsink can be used to control the formats that
* appsink can receive. This property can contain non-fixed caps, the format of
* the pulled samples can be obtained by getting the sample caps.
*
* If one of the pull-preroll or pull-sample methods return %NULL, the appsink
* is stopped or in the EOS state. You can check for the EOS state with the
* "eos" property or with the gst_app_sink_is_eos() method.
*
* The eos signal can also be used to be informed when the EOS state is reached
* to avoid polling.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/base.h>
#include <string.h>
#include "gstappsink.h"
#include "gstapputils.h"
typedef enum
{
NOONE_WAITING = 0,
STREAM_WAITING = 1 << 0, /* streaming thread is waiting for application thread */
APP_WAITING = 1 << 1, /* application thread is waiting for streaming thread */
} GstAppSinkWaitStatus;
typedef struct
{
GstAppSinkCallbacks callbacks;
gpointer user_data;
GDestroyNotify destroy_notify;
gint ref_count;
} Callbacks;
static Callbacks *
callbacks_ref (Callbacks * callbacks)
{
g_atomic_int_inc (&callbacks->ref_count);
return callbacks;
}
static void
callbacks_unref (Callbacks * callbacks)
{
if (!g_atomic_int_dec_and_test (&callbacks->ref_count))
return;
if (callbacks->destroy_notify)
callbacks->destroy_notify (callbacks->user_data);
g_free (callbacks);
}
struct _GstAppSinkPrivate
{
GstCaps *caps;
gboolean emit_signals;
guint64 max_buffers;
GstClockTime max_time;
guint64 max_bytes;
gboolean drop;
gboolean wait_on_eos;
GstAppSinkWaitStatus wait_status;
GstQueueStatusInfo queue_status_info;
GCond cond;
GMutex mutex;
GstQueueArray *queue;
GstBuffer *preroll_buffer;
GstCaps *preroll_caps;
GstCaps *last_caps;
GstSegment preroll_segment;
GstSegment last_segment;
gboolean flushing;
gboolean unlock;
gboolean started;
gboolean is_eos;
gboolean buffer_lists_supported;
Callbacks *callbacks;
GstSample *sample;
};
GST_DEBUG_CATEGORY_STATIC (app_sink_debug);
#define GST_CAT_DEFAULT app_sink_debug
enum
{
/* signals */
SIGNAL_EOS,
SIGNAL_NEW_PREROLL,
SIGNAL_NEW_SAMPLE,
SIGNAL_NEW_SERIALIZED_EVENT,
/* actions */
SIGNAL_PULL_PREROLL,
SIGNAL_PULL_SAMPLE,
SIGNAL_TRY_PULL_PREROLL,
SIGNAL_TRY_PULL_SAMPLE,
SIGNAL_TRY_PULL_OBJECT,
SIGNAL_PROPOSE_ALLOCATION,
LAST_SIGNAL
};
#define DEFAULT_PROP_EOS TRUE
#define DEFAULT_PROP_EMIT_SIGNALS FALSE
#define DEFAULT_PROP_MAX_BUFFERS 0
#define DEFAULT_PROP_MAX_TIME 0
#define DEFAULT_PROP_MAX_BYTES 0
#define DEFAULT_PROP_DROP FALSE
#define DEFAULT_PROP_WAIT_ON_EOS TRUE
#define DEFAULT_PROP_BUFFER_LIST FALSE
enum
{
PROP_0,
PROP_CAPS,
PROP_EOS,
PROP_EMIT_SIGNALS,
PROP_MAX_BUFFERS,
PROP_DROP,
PROP_WAIT_ON_EOS,
PROP_BUFFER_LIST,
PROP_MAX_TIME,
PROP_MAX_BYTES,
PROP_LAST
};
static GstStaticPadTemplate gst_app_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static void gst_app_sink_uri_handler_init (gpointer g_iface,
gpointer iface_data);
static void gst_app_sink_dispose (GObject * object);
static void gst_app_sink_finalize (GObject * object);
static void gst_app_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_app_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_app_sink_unlock_start (GstBaseSink * bsink);
static gboolean gst_app_sink_unlock_stop (GstBaseSink * bsink);
static gboolean gst_app_sink_start (GstBaseSink * psink);
static gboolean gst_app_sink_stop (GstBaseSink * psink);
static gboolean gst_app_sink_event (GstBaseSink * sink, GstEvent * event);
static gboolean gst_app_sink_query (GstBaseSink * bsink, GstQuery * query);
static GstFlowReturn gst_app_sink_preroll (GstBaseSink * psink,
GstBuffer * buffer);
static GstFlowReturn gst_app_sink_render_common (GstBaseSink * psink,
GstMiniObject * data, gboolean is_list);
static GstFlowReturn gst_app_sink_render (GstBaseSink * psink,
GstBuffer * buffer);
static GstFlowReturn gst_app_sink_render_list (GstBaseSink * psink,
GstBufferList * list);
static gboolean gst_app_sink_setcaps (GstBaseSink * sink, GstCaps * caps);
static GstCaps *gst_app_sink_getcaps (GstBaseSink * psink, GstCaps * filter);
static gboolean gst_app_sink_propose_allocation (GstBaseSink * bsink,
GstQuery * query);
static guint gst_app_sink_signals[LAST_SIGNAL] = { 0 };
#define gst_app_sink_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstAppSink, gst_app_sink, GST_TYPE_BASE_SINK,
G_ADD_PRIVATE (GstAppSink)
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER,
gst_app_sink_uri_handler_init));
static void
gst_app_sink_class_init (GstAppSinkClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
GstBaseSinkClass *basesink_class = (GstBaseSinkClass *) klass;
GST_DEBUG_CATEGORY_INIT (app_sink_debug, "appsink", 0, "appsink element");
gobject_class->dispose = gst_app_sink_dispose;
gobject_class->finalize = gst_app_sink_finalize;
gobject_class->set_property = gst_app_sink_set_property;
gobject_class->get_property = gst_app_sink_get_property;
g_object_class_install_property (gobject_class, PROP_CAPS,
g_param_spec_boxed ("caps", "Caps",
"The allowed caps for the sink pad", GST_TYPE_CAPS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_EOS,
g_param_spec_boolean ("eos", "EOS",
"Check if the sink is EOS or not started", DEFAULT_PROP_EOS,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_EMIT_SIGNALS,
g_param_spec_boolean ("emit-signals", "Emit signals",
"Emit new-preroll and new-sample signals",
DEFAULT_PROP_EMIT_SIGNALS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSink:max-buffers:
*
* Maximum amount of buffers in the queue (0 = unlimited).
*/
g_object_class_install_property (gobject_class, PROP_MAX_BUFFERS,
g_param_spec_uint ("max-buffers", "Max Buffers",
"The maximum number of buffers to queue internally (0 = unlimited)",
0, G_MAXUINT, DEFAULT_PROP_MAX_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSink:max-time:
*
* Maximum total duration of data in the queue (0 = unlimited)
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_MAX_TIME,
g_param_spec_uint64 ("max-time", "Max time",
"The maximum total duration to queue internally (in ns, 0 = unlimited)",
0, G_MAXUINT64, DEFAULT_PROP_MAX_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSink:max-bytes:
*
* Maximum amount of bytes in the queue (0 = unlimited)
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_MAX_BYTES,
g_param_spec_uint64 ("max-bytes", "Max bytes",
"The maximum amount of bytes to queue internally (0 = unlimited)",
0, G_MAXUINT64, DEFAULT_PROP_MAX_BYTES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DROP,
g_param_spec_boolean ("drop", "Drop",
"Drop old buffers when the buffer queue is filled", DEFAULT_PROP_DROP,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_BUFFER_LIST,
g_param_spec_boolean ("buffer-list", "Buffer List",
"Use buffer lists", DEFAULT_PROP_BUFFER_LIST,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSink:wait-on-eos:
*
* Wait for all buffers to be processed after receiving an EOS.
*
* In cases where it is uncertain if an @appsink will have a consumer for its buffers
* when it receives an EOS, set to %FALSE to ensure that the @appsink will not hang.
*
* Since: 1.8
*/
g_object_class_install_property (gobject_class, PROP_WAIT_ON_EOS,
g_param_spec_boolean ("wait-on-eos", "Wait on EOS",
"Wait for all buffers to be processed after receiving an EOS",
DEFAULT_PROP_WAIT_ON_EOS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSink::eos:
* @appsink: the appsink element that emitted the signal
*
* Signal that the end-of-stream has been reached. This signal is emitted from
* the streaming thread.
*/
gst_app_sink_signals[SIGNAL_EOS] =
g_signal_new ("eos", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAppSinkClass, eos),
NULL, NULL, NULL, G_TYPE_NONE, 0, G_TYPE_NONE);
/**
* GstAppSink::new-preroll:
* @appsink: the appsink element that emitted the signal
*
* Signal that a new preroll sample is available.
*
* This signal is emitted from the streaming thread and only when the
* "emit-signals" property is %TRUE.
*
* The new preroll sample can be retrieved with the "pull-preroll" action
* signal or gst_app_sink_pull_preroll() either from this signal callback
* or from any other thread.
*
* Note that this signal is only emitted when the "emit-signals" property is
* set to %TRUE, which it is not by default for performance reasons.
*/
gst_app_sink_signals[SIGNAL_NEW_PREROLL] =
g_signal_new ("new-preroll", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAppSinkClass, new_preroll),
NULL, NULL, NULL, GST_TYPE_FLOW_RETURN, 0, G_TYPE_NONE);
/**
* GstAppSink::new-sample:
* @appsink: the appsink element that emitted the signal
*
* Signal that a new sample is available.
*
* This signal is emitted from the streaming thread and only when the
* "emit-signals" property is %TRUE.
*
* The new sample can be retrieved with the "pull-sample" action
* signal or gst_app_sink_pull_sample() either from this signal callback
* or from any other thread.
*
* Note that this signal is only emitted when the "emit-signals" property is
* set to %TRUE, which it is not by default for performance reasons.
*/
gst_app_sink_signals[SIGNAL_NEW_SAMPLE] =
g_signal_new ("new-sample", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAppSinkClass, new_sample),
NULL, NULL, NULL, GST_TYPE_FLOW_RETURN, 0, G_TYPE_NONE);
/**
* GstAppSink::propose-allocation:
* @appsink: the appsink element that emitted the signal
* @query: the allocation query
*
* Signal that a new propose_allocation query is available.
*
* This signal is emitted from the streaming thread and only when the
* "emit-signals" property is %TRUE.
*
* Since: 1.24
*/
gst_app_sink_signals[SIGNAL_PROPOSE_ALLOCATION] =
g_signal_new_class_handler ("propose-allocation",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, NULL, NULL, NULL, NULL,
G_TYPE_BOOLEAN, 1, GST_TYPE_QUERY | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GstAppSink::new-serialized-event:
* @appsink: the appsink element that emitted the signal
*
* Signal that a new downstream serialized event is available.
*
* This signal is emitted from the streaming thread and only when the
* "emit-signals" property is %TRUE.
*
* The new event can be retrieved with the "try-pull-object" action
* signal or gst_app_sink_pull_object() either from this signal callback
* or from any other thread.
*
* EOS will not be notified using this signal, use #GstAppSink::eos instead.
* EOS cannot be pulled either, use gst_app_sink_is_eos() to check for it.
*
* Note that this signal is only emitted when the "emit-signals" property is
* set to %TRUE, which it is not by default for performance reasons.
*
* The callback should return %TRUE if the event has been handled, which will
* skip basesink handling of the event, %FALSE otherwise.
*
* Since: 1.20
*/
gst_app_sink_signals[SIGNAL_NEW_SERIALIZED_EVENT] =
g_signal_new ("new-serialized-event", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_BOOLEAN, 0, G_TYPE_NONE);
/**
* GstAppSink::pull-preroll:
* @appsink: the appsink element to emit this signal on
*
* Get the last preroll sample in @appsink. This was the sample that caused the
* appsink to preroll in the PAUSED state.
*
* This function is typically used when dealing with a pipeline in the PAUSED
* state. Calling this function after doing a seek will give the sample right
* after the seek position.
*
* Calling this function will clear the internal reference to the preroll
* buffer.
*
* Note that the preroll sample will also be returned as the first sample
* when calling gst_app_sink_pull_sample() or the "pull-sample" action signal.
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* This function blocks until a preroll sample or EOS is received or the appsink
* element is set to the READY/NULL state.
*
* Returns: (nullable) (transfer full): a #GstSample or %NULL when the appsink is stopped or EOS.
*/
gst_app_sink_signals[SIGNAL_PULL_PREROLL] =
g_signal_new ("pull-preroll", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSinkClass,
pull_preroll), NULL, NULL, NULL, GST_TYPE_SAMPLE, 0, G_TYPE_NONE);
/**
* GstAppSink::pull-sample:
* @appsink: the appsink element to emit this signal on
*
* This function blocks until a sample or EOS becomes available or the appsink
* element is set to the READY/NULL state.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered samples will be put in a queue so that the application
* can pull samples at its own rate.
*
* Note that when the application does not pull samples fast enough, the
* queued samples could consume a lot of memory, especially when dealing with
* raw video frames. It's possible to control the behaviour of the queue with
* the "drop" and "max-buffers" / "max-bytes" / "max-time" set of properties.
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* Returns: (nullable) (transfer full): a #GstSample or %NULL when the appsink is stopped or EOS.
*/
gst_app_sink_signals[SIGNAL_PULL_SAMPLE] =
g_signal_new ("pull-sample", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSinkClass,
pull_sample), NULL, NULL, NULL, GST_TYPE_SAMPLE, 0, G_TYPE_NONE);
/**
* GstAppSink::try-pull-preroll:
* @appsink: the appsink element to emit this signal on
* @timeout: the maximum amount of time to wait for the preroll sample
*
* Get the last preroll sample in @appsink. This was the sample that caused the
* appsink to preroll in the PAUSED state.
*
* This function is typically used when dealing with a pipeline in the PAUSED
* state. Calling this function after doing a seek will give the sample right
* after the seek position.
*
* Calling this function will clear the internal reference to the preroll
* buffer.
*
* Note that the preroll sample will also be returned as the first sample
* when calling gst_app_sink_pull_sample() or the "pull-sample" action signal.
*
* If an EOS event was received before any buffers or the timeout expires,
* this function returns %NULL. Use gst_app_sink_is_eos () to check for the EOS
* condition.
*
* This function blocks until a preroll sample or EOS is received, the appsink
* element is set to the READY/NULL state, or the timeout expires.
*
* Returns: (nullable) (transfer full): a #GstSample or %NULL when the appsink
* is stopped or EOS or the timeout expires.
*
* Since: 1.10
*/
gst_app_sink_signals[SIGNAL_TRY_PULL_PREROLL] =
g_signal_new ("try-pull-preroll", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstAppSinkClass, try_pull_preroll), NULL, NULL, NULL,
GST_TYPE_SAMPLE, 1, GST_TYPE_CLOCK_TIME);
/**
* GstAppSink::try-pull-sample:
* @appsink: the appsink element to emit this signal on
* @timeout: the maximum amount of time to wait for a sample
*
* This function blocks until a sample or EOS becomes available or the appsink
* element is set to the READY/NULL state or the timeout expires.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered samples will be put in a queue so that the application
* can pull samples at its own rate.
*
* Note that when the application does not pull samples fast enough, the
* queued samples could consume a lot of memory, especially when dealing with
* raw video frames. It's possible to control the behaviour of the queue with
* the "drop" and "max-buffers" / "max-bytes" / "max-time" set of properties.
*
* If an EOS event was received before any buffers or the timeout expires,
* this function returns %NULL. Use gst_app_sink_is_eos () to check
* for the EOS condition.
*
* Returns: (nullable): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
*
* Since: 1.10
*/
gst_app_sink_signals[SIGNAL_TRY_PULL_SAMPLE] =
g_signal_new ("try-pull-sample", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstAppSinkClass, try_pull_sample), NULL, NULL, NULL,
GST_TYPE_SAMPLE, 1, GST_TYPE_CLOCK_TIME);
/**
* GstAppSink::try-pull-object:
* @appsink: the appsink element to emit this signal on
* @timeout: the maximum amount of time to wait for a sample
*
* This function blocks until a sample or an event becomes available or the appsink
* element is set to the READY/NULL state or the timeout expires.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered samples and events will be put in a queue so that the application
* can pull them at its own rate.
* Events can be pulled when the appsink is in the READY, PAUSED or PLAYING state.
*
* Note that when the application does not pull samples fast enough, the
* queued samples could consume a lot of memory, especially when dealing with
* raw video frames. It's possible to control the behaviour of the queue with
* the "drop" and "max-buffers" / "max-bytes" / "max-time" set of properties.
*
* This function will only pull serialized events, excluding
* the EOS event for which this functions returns
* %NULL. Use gst_app_sink_is_eos() to check for the EOS condition.
*
* This signal is a variant of #GstAppSink::try-pull-sample: that can be used
* to handle incoming events as well as samples.
*
* Note that future releases may extend this API to return other object types
* so make sure that your code is checking for the actual type it is handling.
*
* Returns: (nullable) (transfer full): a #GstSample or a #GstEvent or NULL when the appsink is stopped or EOS or the timeout expires.
*
* Since: 1.20
*/
gst_app_sink_signals[SIGNAL_TRY_PULL_OBJECT] =
g_signal_new ("try-pull-object", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstAppSinkClass, try_pull_object), NULL, NULL, NULL,
GST_TYPE_MINI_OBJECT, 1, GST_TYPE_CLOCK_TIME);
gst_element_class_set_static_metadata (element_class, "AppSink",
"Generic/Sink", "Allow the application to get access to raw buffer",
"David Schleef <ds@schleef.org>, Wim Taymans <wim.taymans@gmail.com>");
gst_element_class_add_static_pad_template (element_class,
&gst_app_sink_template);
basesink_class->unlock = gst_app_sink_unlock_start;
basesink_class->unlock_stop = gst_app_sink_unlock_stop;
basesink_class->start = gst_app_sink_start;
basesink_class->stop = gst_app_sink_stop;
basesink_class->event = gst_app_sink_event;
basesink_class->preroll = gst_app_sink_preroll;
basesink_class->render = gst_app_sink_render;
basesink_class->render_list = gst_app_sink_render_list;
basesink_class->get_caps = gst_app_sink_getcaps;
basesink_class->set_caps = gst_app_sink_setcaps;
basesink_class->query = gst_app_sink_query;
basesink_class->propose_allocation = gst_app_sink_propose_allocation;
klass->pull_preroll = gst_app_sink_pull_preroll;
klass->pull_sample = gst_app_sink_pull_sample;
klass->try_pull_preroll = gst_app_sink_try_pull_preroll;
klass->try_pull_sample = gst_app_sink_try_pull_sample;
klass->try_pull_object = gst_app_sink_try_pull_object;
}
static void
gst_app_sink_init (GstAppSink * appsink)
{
GstAppSinkPrivate *priv;
priv = appsink->priv = gst_app_sink_get_instance_private (appsink);
g_mutex_init (&priv->mutex);
g_cond_init (&priv->cond);
priv->queue = gst_queue_array_new (16);
priv->sample = gst_sample_new (NULL, NULL, NULL, NULL);
priv->emit_signals = DEFAULT_PROP_EMIT_SIGNALS;
priv->max_buffers = DEFAULT_PROP_MAX_BUFFERS;
priv->max_bytes = DEFAULT_PROP_MAX_BYTES;
priv->max_time = DEFAULT_PROP_MAX_TIME;
priv->drop = DEFAULT_PROP_DROP;
priv->wait_on_eos = DEFAULT_PROP_WAIT_ON_EOS;
priv->buffer_lists_supported = DEFAULT_PROP_BUFFER_LIST;
priv->wait_status = NOONE_WAITING;
}
static void
gst_app_sink_dispose (GObject * obj)
{
GstAppSink *appsink = GST_APP_SINK_CAST (obj);
GstAppSinkPrivate *priv = appsink->priv;
GstMiniObject *queue_obj;
Callbacks *callbacks = NULL;
GST_OBJECT_LOCK (appsink);
if (priv->caps) {
gst_caps_unref (priv->caps);
priv->caps = NULL;
}
GST_OBJECT_UNLOCK (appsink);
g_mutex_lock (&priv->mutex);
if (priv->callbacks)
callbacks = g_steal_pointer (&priv->callbacks);
while ((queue_obj = gst_queue_array_pop_head (priv->queue)))
gst_mini_object_unref (queue_obj);
gst_buffer_replace (&priv->preroll_buffer, NULL);
gst_caps_replace (&priv->preroll_caps, NULL);
gst_caps_replace (&priv->last_caps, NULL);
if (priv->sample) {
gst_sample_unref (priv->sample);
priv->sample = NULL;
}
g_mutex_unlock (&priv->mutex);
g_clear_pointer (&callbacks, callbacks_unref);
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_app_sink_finalize (GObject * obj)
{
GstAppSink *appsink = GST_APP_SINK_CAST (obj);
GstAppSinkPrivate *priv = appsink->priv;
g_mutex_clear (&priv->mutex);
g_cond_clear (&priv->cond);
gst_queue_array_free (priv->queue);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_app_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAppSink *appsink = GST_APP_SINK_CAST (object);
switch (prop_id) {
case PROP_CAPS:
gst_app_sink_set_caps (appsink, gst_value_get_caps (value));
break;
case PROP_EMIT_SIGNALS:
gst_app_sink_set_emit_signals (appsink, g_value_get_boolean (value));
break;
case PROP_MAX_BUFFERS:
gst_app_sink_set_max_buffers (appsink, g_value_get_uint (value));
break;
case PROP_MAX_TIME:
gst_app_sink_set_max_time (appsink, g_value_get_uint64 (value));
break;
case PROP_MAX_BYTES:
gst_app_sink_set_max_bytes (appsink, g_value_get_uint64 (value));
break;
case PROP_DROP:
gst_app_sink_set_drop (appsink, g_value_get_boolean (value));
break;
case PROP_BUFFER_LIST:
gst_app_sink_set_buffer_list_support (appsink,
g_value_get_boolean (value));
break;
case PROP_WAIT_ON_EOS:
gst_app_sink_set_wait_on_eos (appsink, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_app_sink_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstAppSink *appsink = GST_APP_SINK_CAST (object);
switch (prop_id) {
case PROP_CAPS:
{
GstCaps *caps;
caps = gst_app_sink_get_caps (appsink);
gst_value_set_caps (value, caps);
if (caps)
gst_caps_unref (caps);
break;
}
case PROP_EOS:
g_value_set_boolean (value, gst_app_sink_is_eos (appsink));
break;
case PROP_EMIT_SIGNALS:
g_value_set_boolean (value, gst_app_sink_get_emit_signals (appsink));
break;
case PROP_MAX_BUFFERS:
g_value_set_uint (value, gst_app_sink_get_max_buffers (appsink));
break;
case PROP_MAX_TIME:
g_value_set_uint64 (value, gst_app_sink_get_max_time (appsink));
break;
case PROP_MAX_BYTES:
g_value_set_uint64 (value, gst_app_sink_get_max_bytes (appsink));
break;
case PROP_DROP:
g_value_set_boolean (value, gst_app_sink_get_drop (appsink));
break;
case PROP_BUFFER_LIST:
g_value_set_boolean (value,
gst_app_sink_get_buffer_list_support (appsink));
break;
case PROP_WAIT_ON_EOS:
g_value_set_boolean (value, gst_app_sink_get_wait_on_eos (appsink));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_app_sink_unlock_start (GstBaseSink * bsink)
{
GstAppSink *appsink = GST_APP_SINK_CAST (bsink);
GstAppSinkPrivate *priv = appsink->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "unlock start");
priv->unlock = TRUE;
g_cond_signal (&priv->cond);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_sink_unlock_stop (GstBaseSink * bsink)
{
GstAppSink *appsink = GST_APP_SINK_CAST (bsink);
GstAppSinkPrivate *priv = appsink->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "unlock stop");
priv->unlock = FALSE;
g_cond_signal (&priv->cond);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static void
gst_app_sink_flush_unlocked (GstAppSink * appsink)
{
GstMiniObject *obj;
GstAppSinkPrivate *priv = appsink->priv;
GST_DEBUG_OBJECT (appsink, "flush stop appsink");
priv->is_eos = FALSE;
gst_buffer_replace (&priv->preroll_buffer, NULL);
while ((obj = gst_queue_array_pop_head (priv->queue)))
gst_mini_object_unref (obj);
gst_queue_status_info_reset (&priv->queue_status_info);
gst_caps_replace (&priv->last_caps, NULL);
g_cond_signal (&priv->cond);
}
static gboolean
gst_app_sink_start (GstBaseSink * psink)
{
GstAppSink *appsink = GST_APP_SINK_CAST (psink);
GstAppSinkPrivate *priv = appsink->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "starting");
priv->wait_status = NOONE_WAITING;
priv->flushing = FALSE;
priv->started = TRUE;
gst_segment_init (&priv->preroll_segment, GST_FORMAT_TIME);
gst_segment_init (&priv->last_segment, GST_FORMAT_TIME);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer (priv->sample, NULL);
gst_sample_set_buffer_list (priv->sample, NULL);
gst_sample_set_caps (priv->sample, NULL);
gst_sample_set_segment (priv->sample, NULL);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_sink_stop (GstBaseSink * psink)
{
GstAppSink *appsink = GST_APP_SINK_CAST (psink);
GstAppSinkPrivate *priv = appsink->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "stopping");
priv->flushing = TRUE;
priv->started = FALSE;
priv->wait_status = NOONE_WAITING;
gst_app_sink_flush_unlocked (appsink);
gst_buffer_replace (&priv->preroll_buffer, NULL);
gst_caps_replace (&priv->preroll_caps, NULL);
gst_caps_replace (&priv->last_caps, NULL);
gst_segment_init (&priv->preroll_segment, GST_FORMAT_UNDEFINED);
gst_segment_init (&priv->last_segment, GST_FORMAT_UNDEFINED);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer (priv->sample, NULL);
gst_sample_set_buffer_list (priv->sample, NULL);
gst_sample_set_caps (priv->sample, NULL);
gst_sample_set_segment (priv->sample, NULL);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_sink_setcaps (GstBaseSink * sink, GstCaps * caps)
{
GstAppSink *appsink = GST_APP_SINK_CAST (sink);
GstAppSinkPrivate *priv = appsink->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "receiving CAPS");
gst_queue_array_push_tail (priv->queue, gst_event_new_caps (caps));
gst_queue_status_info_push_event (&priv->queue_status_info);
if (!priv->preroll_buffer)
gst_caps_replace (&priv->preroll_caps, caps);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_sink_event (GstBaseSink * sink, GstEvent * event)
{
GstAppSink *appsink = GST_APP_SINK_CAST (sink);
GstAppSinkPrivate *priv = appsink->priv;
GST_DEBUG_OBJECT (appsink, "%" GST_PTR_FORMAT, event);
switch (event->type) {
case GST_EVENT_SEGMENT:
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "receiving SEGMENT");
if (!priv->preroll_buffer)
gst_event_copy_segment (event, &priv->preroll_segment);
g_mutex_unlock (&priv->mutex);
break;
case GST_EVENT_EOS:{
gboolean emit = TRUE;
Callbacks *callbacks = NULL;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "receiving EOS");
priv->is_eos = TRUE;
g_cond_signal (&priv->cond);
g_mutex_unlock (&priv->mutex);
g_mutex_lock (&priv->mutex);
/* Wait until all buffers are consumed, or we're flushing.
* Otherwise, we might signal EOS before all buffers are
* consumed, which is a bit confusing for the application
*/
while (priv->queue_status_info.queued_buffers > 0 && !priv->flushing
&& priv->wait_on_eos) {
if (priv->unlock) {
/* we are asked to unlock, call the wait_preroll method */
g_mutex_unlock (&priv->mutex);
if (gst_base_sink_wait_preroll (sink) != GST_FLOW_OK) {
/* Directly go out of here */
gst_event_unref (event);
return FALSE;
}
/* we are allowed to continue now */
g_mutex_lock (&priv->mutex);
continue;
}
priv->wait_status |= STREAM_WAITING;
g_cond_wait (&priv->cond, &priv->mutex);
priv->wait_status &= ~STREAM_WAITING;
}
if (priv->flushing)
emit = FALSE;
if (emit && priv->callbacks)
callbacks = callbacks_ref (priv->callbacks);
g_mutex_unlock (&priv->mutex);
if (emit) {
/* emit EOS now */
if (callbacks && callbacks->callbacks.eos)
callbacks->callbacks.eos (appsink, callbacks->user_data);
else
g_signal_emit (appsink, gst_app_sink_signals[SIGNAL_EOS], 0);
g_clear_pointer (&callbacks, callbacks_unref);
}
break;
}
case GST_EVENT_FLUSH_START:
/* we don't have to do anything here, the base class will call unlock
* which will make sure we exit the _render method */
GST_DEBUG_OBJECT (appsink, "received FLUSH_START");
break;
case GST_EVENT_FLUSH_STOP:
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "received FLUSH_STOP");
gst_app_sink_flush_unlocked (appsink);
g_mutex_unlock (&priv->mutex);
break;
default:
break;
}
if (GST_EVENT_TYPE (event) != GST_EVENT_EOS
&& GST_EVENT_IS_SERIALIZED (event)) {
gboolean emit;
Callbacks *callbacks = NULL;
gboolean ret;
g_mutex_lock (&priv->mutex);
emit = priv->emit_signals;
if (priv->callbacks)
callbacks = callbacks_ref (priv->callbacks);
gst_queue_array_push_tail (priv->queue, gst_event_ref (event));
gst_queue_status_info_push_event (&priv->queue_status_info);
if ((priv->wait_status & APP_WAITING))
g_cond_signal (&priv->cond);
g_mutex_unlock (&priv->mutex);
if (callbacks && callbacks->callbacks.new_event) {
ret = callbacks->callbacks.new_event (appsink, callbacks->user_data);
} else {
ret = FALSE;
if (emit)
g_signal_emit (appsink,
gst_app_sink_signals[SIGNAL_NEW_SERIALIZED_EVENT], 0, &ret);
}
g_clear_pointer (&callbacks, callbacks_unref);
if (ret) {
gst_event_unref (event);
return TRUE;
}
}
return GST_BASE_SINK_CLASS (parent_class)->event (sink, event);
}
static GstFlowReturn
gst_app_sink_preroll (GstBaseSink * psink, GstBuffer * buffer)
{
GstFlowReturn res;
GstAppSink *appsink = GST_APP_SINK_CAST (psink);
GstAppSinkPrivate *priv = appsink->priv;
gboolean emit;
Callbacks *callbacks = NULL;
g_mutex_lock (&priv->mutex);
if (priv->flushing)
goto flushing;
GST_DEBUG_OBJECT (appsink, "setting preroll buffer %p", buffer);
gst_buffer_replace (&priv->preroll_buffer, buffer);
if ((priv->wait_status & APP_WAITING))
g_cond_signal (&priv->cond);
emit = priv->emit_signals;
if (priv->callbacks)
callbacks = callbacks_ref (priv->callbacks);
g_mutex_unlock (&priv->mutex);
if (callbacks && callbacks->callbacks.new_preroll) {
res = callbacks->callbacks.new_preroll (appsink, callbacks->user_data);
} else {
res = GST_FLOW_OK;
if (emit)
g_signal_emit (appsink, gst_app_sink_signals[SIGNAL_NEW_PREROLL], 0,
&res);
}
g_clear_pointer (&callbacks, callbacks_unref);
return res;
flushing:
{
GST_DEBUG_OBJECT (appsink, "we are flushing");
g_mutex_unlock (&priv->mutex);
return GST_FLOW_FLUSHING;
}
}
static GstMiniObject *
dequeue_object (GstAppSink * appsink)
{
GstAppSinkPrivate *priv = appsink->priv;
GstMiniObject *obj;
obj = gst_queue_array_pop_head (priv->queue);
if (GST_IS_BUFFER (obj) || GST_IS_BUFFER_LIST (obj)) {
GST_DEBUG_OBJECT (appsink, "dequeued buffer/list %p", obj);
} else if (GST_IS_EVENT (obj)) {
GstEvent *event = GST_EVENT_CAST (obj);
switch (GST_EVENT_TYPE (obj)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
GST_DEBUG_OBJECT (appsink, "activating caps %" GST_PTR_FORMAT, caps);
gst_caps_replace (&priv->last_caps, caps);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_caps (priv->sample, priv->last_caps);
break;
}
case GST_EVENT_SEGMENT:
gst_event_copy_segment (event, &priv->last_segment);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_segment (priv->sample, &priv->last_segment);
GST_DEBUG_OBJECT (appsink, "activated segment %" GST_SEGMENT_FORMAT,
&priv->last_segment);
break;
default:
break;
}
}
/* We don't have last/current segment differentiation in appsink, so pass last_segment twice */
gst_queue_status_info_pop (&priv->queue_status_info, obj,
&priv->last_segment, &priv->last_segment, GST_OBJECT_CAST (appsink));
return obj;
}
static GstMiniObject *
dequeue_buffer (GstAppSink * appsink)
{
GstMiniObject *obj;
do {
obj = dequeue_object (appsink);
if (GST_IS_BUFFER (obj) || GST_IS_BUFFER_LIST (obj)) {
break;
}
gst_mini_object_unref (obj);
} while (TRUE);
return obj;
}
static GstFlowReturn
gst_app_sink_render_common (GstBaseSink * psink, GstMiniObject * data,
gboolean is_list)
{
GstFlowReturn ret;
GstAppSink *appsink = GST_APP_SINK_CAST (psink);
GstAppSinkPrivate *priv = appsink->priv;
gboolean emit;
Callbacks *callbacks = NULL;
restart:
g_mutex_lock (&priv->mutex);
if (priv->flushing)
goto flushing;
/* queue holding caps event might have been FLUSHed,
* but caps state still present in pad caps */
if (G_UNLIKELY (!priv->last_caps &&
gst_pad_has_current_caps (GST_BASE_SINK_PAD (psink)))) {
priv->last_caps = gst_pad_get_current_caps (GST_BASE_SINK_PAD (psink));
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_caps (priv->sample, priv->last_caps);
GST_DEBUG_OBJECT (appsink, "activating pad caps %" GST_PTR_FORMAT,
priv->last_caps);
}
GST_DEBUG_OBJECT (appsink,
"pushing render buffer/list %p on queue (%" G_GUINT64_FORMAT ")", data,
priv->queue_status_info.queued_buffers);
while (gst_queue_status_info_is_full (&priv->queue_status_info,
priv->max_buffers, priv->max_bytes, priv->max_time)) {
if (priv->drop) {
GstMiniObject *old;
/* we need to drop the oldest buffer/list and try again */
if ((old = dequeue_buffer (appsink))) {
GST_DEBUG_OBJECT (appsink, "dropping old buffer/list %p", old);
gst_mini_object_unref (old);
}
} else {
GST_DEBUG_OBJECT (appsink,
"waiting for free space: have %" G_GUINT64_FORMAT " buffers (max %"
G_GUINT64_FORMAT "), %" G_GUINT64_FORMAT " bytes (max %"
G_GUINT64_FORMAT "), %" G_GUINT64_FORMAT " time (max %"
G_GUINT64_FORMAT ")", priv->queue_status_info.queued_buffers,
priv->max_buffers, priv->queue_status_info.queued_bytes,
priv->max_bytes, priv->queue_status_info.queued_time, priv->max_time);
if (priv->unlock) {
/* we are asked to unlock, call the wait_preroll method */
g_mutex_unlock (&priv->mutex);
if ((ret = gst_base_sink_wait_preroll (psink)) != GST_FLOW_OK)
goto stopping;
/* we are allowed to continue now */
goto restart;
}
/* wait for a buffer to be removed or flush */
priv->wait_status |= STREAM_WAITING;
g_cond_wait (&priv->cond, &priv->mutex);
priv->wait_status &= ~STREAM_WAITING;
if (priv->flushing)
goto flushing;
}
}
/* we need to ref the buffer/list when pushing it in the queue */
gst_queue_array_push_tail (priv->queue, gst_mini_object_ref (data));
gst_queue_status_info_push (&priv->queue_status_info, data,
&priv->last_segment, GST_OBJECT_CAST (appsink));
if ((priv->wait_status & APP_WAITING))
g_cond_signal (&priv->cond);
emit = priv->emit_signals;
if (priv->callbacks)
callbacks = callbacks_ref (priv->callbacks);
g_mutex_unlock (&priv->mutex);
if (callbacks && callbacks->callbacks.new_sample) {
ret = callbacks->callbacks.new_sample (appsink, callbacks->user_data);
} else {
ret = GST_FLOW_OK;
if (emit)
g_signal_emit (appsink, gst_app_sink_signals[SIGNAL_NEW_SAMPLE], 0, &ret);
}
g_clear_pointer (&callbacks, callbacks_unref);
return ret;
flushing:
{
GST_DEBUG_OBJECT (appsink, "we are flushing");
g_mutex_unlock (&priv->mutex);
return GST_FLOW_FLUSHING;
}
stopping:
{
GST_DEBUG_OBJECT (appsink, "we are stopping");
return ret;
}
}
static GstFlowReturn
gst_app_sink_render (GstBaseSink * psink, GstBuffer * buffer)
{
return gst_app_sink_render_common (psink, GST_MINI_OBJECT_CAST (buffer),
FALSE);
}
static GstFlowReturn
gst_app_sink_render_list (GstBaseSink * sink, GstBufferList * list)
{
GstFlowReturn flow;
GstAppSink *appsink;
GstBuffer *buffer;
guint i, len;
appsink = GST_APP_SINK_CAST (sink);
if (appsink->priv->buffer_lists_supported)
return gst_app_sink_render_common (sink, GST_MINI_OBJECT_CAST (list), TRUE);
/* The application doesn't support buffer lists, extract individual buffers
* then and push them one-by-one */
GST_INFO_OBJECT (sink, "chaining each group in list as a merged buffer");
len = gst_buffer_list_length (list);
flow = GST_FLOW_OK;
for (i = 0; i < len; i++) {
buffer = gst_buffer_list_get (list, i);
flow = gst_app_sink_render (sink, buffer);
if (flow != GST_FLOW_OK)
break;
}
return flow;
}
static GstCaps *
gst_app_sink_getcaps (GstBaseSink * psink, GstCaps * filter)
{
GstCaps *caps;
GstAppSink *appsink = GST_APP_SINK_CAST (psink);
GstAppSinkPrivate *priv = appsink->priv;
GST_OBJECT_LOCK (appsink);
if ((caps = priv->caps)) {
if (filter)
caps = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
else
gst_caps_ref (caps);
}
GST_DEBUG_OBJECT (appsink, "got caps %" GST_PTR_FORMAT, caps);
GST_OBJECT_UNLOCK (appsink);
return caps;
}
static gboolean
gst_app_sink_query (GstBaseSink * bsink, GstQuery * query)
{
GstAppSink *appsink = GST_APP_SINK_CAST (bsink);
GstAppSinkPrivate *priv = appsink->priv;
gboolean ret;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DRAIN:
{
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsink, "waiting buffers to be consumed");
while (priv->queue_status_info.queued_buffers > 0 || priv->preroll_buffer) {
if (priv->unlock) {
/* we are asked to unlock, call the wait_preroll method */
g_mutex_unlock (&priv->mutex);
if (gst_base_sink_wait_preroll (bsink) != GST_FLOW_OK) {
/* Directly go out of here */
return FALSE;
}
/* we are allowed to continue now */
g_mutex_lock (&priv->mutex);
continue;
}
priv->wait_status |= STREAM_WAITING;
g_cond_wait (&priv->cond, &priv->mutex);
priv->wait_status &= ~STREAM_WAITING;
if (priv->flushing)
break;
}
g_mutex_unlock (&priv->mutex);
ret = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
/* we don't supporting seeking */
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
gst_query_set_seeking (query, fmt, FALSE, 0, -1);
ret = TRUE;
break;
}
default:
ret = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
return ret;
}
/* external API */
/**
* gst_app_sink_set_caps:
* @appsink: a #GstAppSink
* @caps: (nullable): caps to set
*
* Set the capabilities on the appsink element. This function takes
* a copy of the caps structure. After calling this method, the sink will only
* accept caps that match @caps. If @caps is non-fixed, or incomplete,
* you must check the caps on the samples to get the actual used caps.
*/
void
gst_app_sink_set_caps (GstAppSink * appsink, const GstCaps * caps)
{
GstCaps *old;
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
GST_OBJECT_LOCK (appsink);
GST_DEBUG_OBJECT (appsink, "setting caps to %" GST_PTR_FORMAT, caps);
if ((old = priv->caps) != caps) {
if (caps)
priv->caps = gst_caps_copy (caps);
else
priv->caps = NULL;
if (old)
gst_caps_unref (old);
}
GST_OBJECT_UNLOCK (appsink);
}
/**
* gst_app_sink_get_caps:
* @appsink: a #GstAppSink
*
* Get the configured caps on @appsink.
*
* Returns: (nullable) (transfer full): the #GstCaps accepted by the sink. gst_caps_unref() after usage.
*/
GstCaps *
gst_app_sink_get_caps (GstAppSink * appsink)
{
GstCaps *caps;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
priv = appsink->priv;
GST_OBJECT_LOCK (appsink);
if ((caps = priv->caps))
gst_caps_ref (caps);
GST_DEBUG_OBJECT (appsink, "getting caps of %" GST_PTR_FORMAT, caps);
GST_OBJECT_UNLOCK (appsink);
return caps;
}
/**
* gst_app_sink_is_eos:
* @appsink: a #GstAppSink
*
* Check if @appsink is EOS, which is when no more samples can be pulled because
* an EOS event was received.
*
* This function also returns %TRUE when the appsink is not in the PAUSED or
* PLAYING state.
*
* Returns: %TRUE if no more samples can be pulled and the appsink is EOS.
*/
gboolean
gst_app_sink_is_eos (GstAppSink * appsink)
{
gboolean ret;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
if (!priv->started)
goto not_started;
if (priv->is_eos && priv->queue_status_info.queued_buffers == 0) {
GST_DEBUG_OBJECT (appsink, "we are EOS and the queue is empty");
ret = TRUE;
} else {
GST_DEBUG_OBJECT (appsink, "we are not yet EOS");
ret = FALSE;
}
g_mutex_unlock (&priv->mutex);
return ret;
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return TRUE");
g_mutex_unlock (&priv->mutex);
return TRUE;
}
}
/**
* gst_app_sink_set_emit_signals:
* @appsink: a #GstAppSink
* @emit: the new state
*
* Make appsink emit the "new-preroll" and "new-sample" signals. This option is
* by default disabled because signal emission is expensive and unneeded when
* the application prefers to operate in pull mode.
*/
void
gst_app_sink_set_emit_signals (GstAppSink * appsink, gboolean emit)
{
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
priv->emit_signals = emit;
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_sink_get_emit_signals:
* @appsink: a #GstAppSink
*
* Check if appsink will emit the "new-preroll" and "new-sample" signals.
*
* Returns: %TRUE if @appsink is emitting the "new-preroll" and "new-sample"
* signals.
*/
gboolean
gst_app_sink_get_emit_signals (GstAppSink * appsink)
{
gboolean result;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
result = priv->emit_signals;
g_mutex_unlock (&priv->mutex);
return result;
}
#define GST_APP_SINK_GET_PROPERTY(prop_name) \
G_STMT_START { \
GstAppSinkPrivate *priv; \
guint result; \
\
g_return_val_if_fail (GST_IS_APP_SINK (appsink), 0); \
\
priv = appsink->priv; \
\
g_mutex_lock (&priv->mutex); \
result = priv->prop_name; \
g_mutex_unlock (&priv->mutex); \
\
return result; \
} G_STMT_END
#define GST_APP_SINK_SET_PROPERTY(prop_name, value) \
G_STMT_START { \
GstAppSinkPrivate *priv; \
\
g_return_if_fail (GST_IS_APP_SINK (appsink)); \
\
priv = appsink->priv; \
\
g_mutex_lock (&priv->mutex); \
\
if (value != priv->prop_name) { \
priv->prop_name = value; \
/* signal the change */ \
g_cond_signal (&priv->cond); \
} \
\
g_mutex_unlock (&priv->mutex); \
} G_STMT_END
/**
* gst_app_sink_set_max_buffers:
* @appsink: a #GstAppSink
* @max: the maximum number of buffers to queue
*
* Set the maximum amount of buffers that can be queued in @appsink. After this
* amount of buffers are queued in appsink, any more buffers will block upstream
* elements until a sample is pulled from @appsink, unless 'drop' is set, in which
* case new buffers will be discarded.
*/
void
gst_app_sink_set_max_buffers (GstAppSink * appsink, guint max)
{
GST_APP_SINK_SET_PROPERTY (max_buffers, max);
}
/**
* gst_app_sink_set_max_time:
* @appsink: a #GstAppSink
* @max: the maximum total duration to queue
*
* Set the maximum total duration that can be queued in @appsink. After this
* amount of buffers are queued in appsink, any more buffers will block upstream
* elements until a sample is pulled from @appsink, unless 'drop' is set, in which
* case new buffers will be discarded.
*
* Since: 1.24
*/
void
gst_app_sink_set_max_time (GstAppSink * appsink, GstClockTime max)
{
GST_APP_SINK_SET_PROPERTY (max_time, max);
}
/**
* gst_app_sink_set_max_bytes:
* @appsink: a #GstAppSink
* @max: the maximum total size of buffers to queue, in bytes
*
* Set the maximum total size that can be queued in @appsink. After this
* amount of buffers are queued in appsink, any more buffers will block upstream
* elements until a sample is pulled from @appsink, unless 'drop' is set, in which
* case new buffers will be discarded.
*
* Since: 1.24
*/
void
gst_app_sink_set_max_bytes (GstAppSink * appsink, guint64 max)
{
GST_APP_SINK_SET_PROPERTY (max_bytes, max);
}
/**
* gst_app_sink_get_max_buffers:
* @appsink: a #GstAppSink
*
* Get the maximum amount of buffers that can be queued in @appsink.
*
* Returns: The maximum amount of buffers that can be queued.
*/
guint
gst_app_sink_get_max_buffers (GstAppSink * appsink)
{
GST_APP_SINK_GET_PROPERTY (max_buffers);
}
/**
* gst_app_sink_get_max_time:
* @appsink: a #GstAppSink
*
* Get the maximum total duration that can be queued in @appsink.
*
* Returns: The maximum total duration that can be queued.
*
* Since: 1.24
*/
GstClockTime
gst_app_sink_get_max_time (GstAppSink * appsink)
{
GST_APP_SINK_GET_PROPERTY (max_time);
}
/**
* gst_app_sink_get_max_bytes:
* @appsink: a #GstAppSink
*
* Get the maximum total size, in bytes, that can be queued in @appsink.
*
* Returns: The maximum amount of bytes that can be queued
*
* Since: 1.24
*/
guint64
gst_app_sink_get_max_bytes (GstAppSink * appsink)
{
GST_APP_SINK_GET_PROPERTY (max_bytes);
}
#undef GST_APP_SINK_GET_PROPERTY
#undef GST_APP_SINK_SET_PROPERTY
/**
* gst_app_sink_set_drop:
* @appsink: a #GstAppSink
* @drop: the new state
*
* Instruct @appsink to drop old buffers when the maximum amount of queued
* data is reached, that is, when any configured limit is hit (max-buffers, max-time or max-bytes).
*/
void
gst_app_sink_set_drop (GstAppSink * appsink, gboolean drop)
{
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
if (priv->drop != drop) {
priv->drop = drop;
/* signal the change */
g_cond_signal (&priv->cond);
}
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_sink_get_drop:
* @appsink: a #GstAppSink
*
* Check if @appsink will drop old buffers when the maximum amount of queued
* data is reached (meaning max buffers, time or bytes limit, whichever is hit first).
*
* Returns: %TRUE if @appsink is dropping old buffers when the queue is
* filled.
*/
gboolean
gst_app_sink_get_drop (GstAppSink * appsink)
{
gboolean result;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
result = priv->drop;
g_mutex_unlock (&priv->mutex);
return result;
}
/**
* gst_app_sink_set_buffer_list_support:
* @appsink: a #GstAppSink
* @enable_lists: enable or disable buffer list support
*
* Instruct @appsink to enable or disable buffer list support.
*
* For backwards-compatibility reasons applications need to opt in
* to indicate that they will be able to handle buffer lists.
*
* Since: 1.12
*/
void
gst_app_sink_set_buffer_list_support (GstAppSink * appsink,
gboolean enable_lists)
{
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
if (priv->buffer_lists_supported != enable_lists) {
priv->buffer_lists_supported = enable_lists;
}
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_sink_get_buffer_list_support:
* @appsink: a #GstAppSink
*
* Check if @appsink supports buffer lists.
*
* Returns: %TRUE if @appsink supports buffer lists.
*
* Since: 1.12
*/
gboolean
gst_app_sink_get_buffer_list_support (GstAppSink * appsink)
{
gboolean result;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
result = priv->buffer_lists_supported;
g_mutex_unlock (&priv->mutex);
return result;
}
/**
* gst_app_sink_set_wait_on_eos:
* @appsink: a #GstAppSink
* @wait: the new state
*
* Instruct @appsink to wait for all buffers to be consumed when an EOS is received.
*
*/
void
gst_app_sink_set_wait_on_eos (GstAppSink * appsink, gboolean wait)
{
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
if (priv->wait_on_eos != wait) {
priv->wait_on_eos = wait;
/* signal the change */
g_cond_signal (&priv->cond);
}
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_sink_get_wait_on_eos:
* @appsink: a #GstAppSink
*
* Check if @appsink will wait for all buffers to be consumed when an EOS is
* received.
*
* Returns: %TRUE if @appsink will wait for all buffers to be consumed when an
* EOS is received.
*/
gboolean
gst_app_sink_get_wait_on_eos (GstAppSink * appsink)
{
gboolean result;
GstAppSinkPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), FALSE);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
result = priv->wait_on_eos;
g_mutex_unlock (&priv->mutex);
return result;
}
/**
* gst_app_sink_pull_preroll:
* @appsink: a #GstAppSink
*
* Get the last preroll sample in @appsink. This was the sample that caused the
* appsink to preroll in the PAUSED state.
*
* This function is typically used when dealing with a pipeline in the PAUSED
* state. Calling this function after doing a seek will give the sample right
* after the seek position.
*
* Calling this function will clear the internal reference to the preroll
* buffer.
*
* Note that the preroll sample will also be returned as the first sample
* when calling gst_app_sink_pull_sample().
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* This function blocks until a preroll sample or EOS is received or the appsink
* element is set to the READY/NULL state.
*
* Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS.
* Call gst_sample_unref() after usage.
*/
GstSample *
gst_app_sink_pull_preroll (GstAppSink * appsink)
{
return gst_app_sink_try_pull_preroll (appsink, GST_CLOCK_TIME_NONE);
}
/**
* gst_app_sink_pull_sample:
* @appsink: a #GstAppSink
*
* This function blocks until a sample or EOS becomes available or the appsink
* element is set to the READY/NULL state.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered buffers will be put in a queue so that the application
* can pull samples at its own rate. Note that when the application does not
* pull samples fast enough, the queued buffers could consume a lot of memory,
* especially when dealing with raw video frames.
*
* If an EOS event was received before any buffers, this function returns
* %NULL. Use gst_app_sink_is_eos () to check for the EOS condition.
*
* Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS.
* Call gst_sample_unref() after usage.
*/
GstSample *
gst_app_sink_pull_sample (GstAppSink * appsink)
{
return gst_app_sink_try_pull_sample (appsink, GST_CLOCK_TIME_NONE);
}
/**
* gst_app_sink_pull_object: (skip)
* @appsink: a #GstAppSink
*
* This function blocks until a sample or an event becomes available or the appsink
* element is set to the READY/NULL state.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered buffers and events will be put in a queue so that the application
* can pull them at its own rate. Note that when the application does not
* pull samples fast enough, the queued buffers could consume a lot of memory,
* especially when dealing with raw video frames.
* Events can be pulled when the appsink is in the READY, PAUSED or PLAYING state.
*
* This function will only pull serialized events, excluding
* the EOS event for which this functions returns
* %NULL. Use gst_app_sink_is_eos() to check for the EOS condition.
*
* This method is a variant of gst_app_sink_pull_sample() that can be used
* to handle incoming events events as well as samples.
*
* Note that future releases may extend this API to return other object types
* so make sure that your code is checking for the actual type it is handling.
*
* Returns: (transfer full) (nullable): a #GstSample, or a #GstEvent or NULL when the appsink is stopped or EOS.
* Call gst_mini_object_unref() after usage.
*
* Since: 1.20
*/
GstMiniObject *
gst_app_sink_pull_object (GstAppSink * appsink)
{
return gst_app_sink_try_pull_object (appsink, GST_CLOCK_TIME_NONE);
}
/**
* gst_app_sink_try_pull_preroll:
* @appsink: a #GstAppSink
* @timeout: the maximum amount of time to wait for the preroll sample
*
* Get the last preroll sample in @appsink. This was the sample that caused the
* appsink to preroll in the PAUSED state.
*
* This function is typically used when dealing with a pipeline in the PAUSED
* state. Calling this function after doing a seek will give the sample right
* after the seek position.
*
* Calling this function will clear the internal reference to the preroll
* buffer.
*
* Note that the preroll sample will also be returned as the first sample
* when calling gst_app_sink_pull_sample().
*
* If an EOS event was received before any buffers or the timeout expires,
* this function returns %NULL. Use gst_app_sink_is_eos () to check for the EOS
* condition.
*
* This function blocks until a preroll sample or EOS is received, the appsink
* element is set to the READY/NULL state, or the timeout expires.
*
* Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
* Call gst_sample_unref() after usage.
*
* Since: 1.10
*/
GstSample *
gst_app_sink_try_pull_preroll (GstAppSink * appsink, GstClockTime timeout)
{
GstAppSinkPrivate *priv;
GstSample *sample = NULL;
gboolean timeout_valid;
gint64 end_time;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
priv = appsink->priv;
timeout_valid = GST_CLOCK_TIME_IS_VALID (timeout);
if (timeout_valid)
end_time =
g_get_monotonic_time () + timeout / (GST_SECOND / G_TIME_SPAN_SECOND);
g_mutex_lock (&priv->mutex);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab a buffer");
if (!priv->started)
goto not_started;
if (priv->preroll_buffer != NULL)
break;
if (priv->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for the preroll buffer");
priv->wait_status |= APP_WAITING;
if (timeout_valid) {
if (!g_cond_wait_until (&priv->cond, &priv->mutex, end_time))
goto expired;
} else {
g_cond_wait (&priv->cond, &priv->mutex);
}
priv->wait_status &= ~APP_WAITING;
}
sample =
gst_sample_new (priv->preroll_buffer, priv->preroll_caps,
&priv->preroll_segment, NULL);
gst_buffer_replace (&priv->preroll_buffer, NULL);
GST_DEBUG_OBJECT (appsink, "we have the preroll sample %p", sample);
g_mutex_unlock (&priv->mutex);
return sample;
/* special conditions */
expired:
{
GST_DEBUG_OBJECT (appsink, "timeout expired, return NULL");
priv->wait_status &= ~APP_WAITING;
g_mutex_unlock (&priv->mutex);
return NULL;
}
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
}
/**
* gst_app_sink_try_pull_sample:
* @appsink: a #GstAppSink
* @timeout: the maximum amount of time to wait for a sample
*
* This function blocks until a sample or EOS becomes available or the appsink
* element is set to the READY/NULL state or the timeout expires.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered buffers will be put in a queue so that the application
* can pull samples at its own rate. Note that when the application does not
* pull samples fast enough, the queued buffers could consume a lot of memory,
* especially when dealing with raw video frames.
*
* If an EOS event was received before any buffers or the timeout expires,
* this function returns %NULL. Use gst_app_sink_is_eos () to check for the EOS
* condition.
*
* Returns: (transfer full) (nullable): a #GstSample or NULL when the appsink is stopped or EOS or the timeout expires.
* Call gst_sample_unref() after usage.
*
* Since: 1.10
*/
GstSample *
gst_app_sink_try_pull_sample (GstAppSink * appsink, GstClockTime timeout)
{
while (TRUE) {
GstMiniObject *obj;
obj = gst_app_sink_try_pull_object (appsink, timeout);
if (!obj) {
return NULL;
} else if (GST_IS_SAMPLE (obj)) {
return GST_SAMPLE_CAST (obj);
} else {
gst_mini_object_unref (obj);
}
}
}
/**
* gst_app_sink_try_pull_object: (skip)
* @appsink: a #GstAppSink
* @timeout: the maximum amount of time to wait for a sample
*
* This function blocks until a sample or an event or EOS becomes available or the appsink
* element is set to the READY/NULL state or the timeout expires.
*
* This function will only return samples when the appsink is in the PLAYING
* state. All rendered buffers and events will be put in a queue so that the application
* can pull them at its own rate. Note that when the application does not
* pull samples fast enough, the queued buffers could consume a lot of memory,
* especially when dealing with raw video frames.
* Events can be pulled when the appsink is in the READY, PAUSED or PLAYING state.
*
* This function will only pull serialized events, excluding
* the EOS event for which this functions returns
* %NULL. Use gst_app_sink_is_eos() to check for the EOS condition.
*
* This method is a variant of gst_app_sink_try_pull_sample() that can be used
* to handle incoming events events as well as samples.
*
* Note that future releases may extend this API to return other object types
* so make sure that your code is checking for the actual type it is handling.
*
* Returns: (transfer full) (nullable): a #GstSample, or #GstEvent or NULL when the appsink is stopped or EOS or the timeout expires.
* Call gst_mini_object_unref() after usage.
*
* Since: 1.20
*/
GstMiniObject *
gst_app_sink_try_pull_object (GstAppSink * appsink, GstClockTime timeout)
{
GstAppSinkPrivate *priv;
GstMiniObject *obj = NULL, *ret;
gboolean timeout_valid;
gint64 end_time;
g_return_val_if_fail (GST_IS_APP_SINK (appsink), NULL);
timeout_valid = GST_CLOCK_TIME_IS_VALID (timeout);
if (timeout_valid)
end_time =
g_get_monotonic_time () + timeout / (GST_SECOND / G_TIME_SPAN_SECOND);
priv = appsink->priv;
g_mutex_lock (&priv->mutex);
gst_buffer_replace (&priv->preroll_buffer, NULL);
while (TRUE) {
GST_DEBUG_OBJECT (appsink, "trying to grab an object");
if (!priv->started)
goto not_started;
if (priv->queue_status_info.queued_buffers > 0
|| priv->queue_status_info.num_events > 0)
break;
if (priv->is_eos)
goto eos;
/* nothing to return, wait */
GST_DEBUG_OBJECT (appsink, "waiting for an object");
priv->wait_status |= APP_WAITING;
if (timeout_valid) {
if (!g_cond_wait_until (&priv->cond, &priv->mutex, end_time))
goto expired;
} else {
g_cond_wait (&priv->cond, &priv->mutex);
}
priv->wait_status &= ~APP_WAITING;
}
obj = dequeue_object (appsink);
/* convert buffer and buffer list to sample */
if (GST_IS_BUFFER (obj)) {
GST_DEBUG_OBJECT (appsink, "we have a buffer %p", obj);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer_list (priv->sample, NULL);
gst_sample_set_buffer (priv->sample, GST_BUFFER_CAST (obj));
ret = GST_MINI_OBJECT_CAST (gst_sample_ref (priv->sample));
gst_mini_object_unref (obj);
} else if (GST_IS_BUFFER_LIST (obj)) {
GST_DEBUG_OBJECT (appsink, "we have a list %p", obj);
priv->sample = gst_sample_make_writable (priv->sample);
gst_sample_set_buffer (priv->sample, NULL);
gst_sample_set_buffer_list (priv->sample, GST_BUFFER_LIST_CAST (obj));
ret = GST_MINI_OBJECT_CAST (gst_sample_ref (priv->sample));
gst_mini_object_unref (obj);
} else {
ret = obj;
}
if ((priv->wait_status & STREAM_WAITING))
g_cond_signal (&priv->cond);
g_mutex_unlock (&priv->mutex);
return ret;
/* special conditions */
expired:
{
GST_DEBUG_OBJECT (appsink, "timeout expired, return NULL");
priv->wait_status &= ~APP_WAITING;
g_mutex_unlock (&priv->mutex);
return NULL;
}
eos:
{
GST_DEBUG_OBJECT (appsink, "we are EOS, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
not_started:
{
GST_DEBUG_OBJECT (appsink, "we are stopped, return NULL");
g_mutex_unlock (&priv->mutex);
return NULL;
}
}
/**
* gst_app_sink_set_callbacks: (skip)
* @appsink: a #GstAppSink
* @callbacks: the callbacks
* @user_data: a user_data argument for the callbacks
* @notify: a destroy notify function
*
* Set callbacks which will be executed for each new preroll, new sample and eos.
* This is an alternative to using the signals, it has lower overhead and is thus
* less expensive, but also less flexible.
*
* If callbacks are installed, no signals will be emitted for performance
* reasons.
*
* Before 1.16.3 it was not possible to change the callbacks in a thread-safe
* way.
*/
void
gst_app_sink_set_callbacks (GstAppSink * appsink,
GstAppSinkCallbacks * callbacks, gpointer user_data, GDestroyNotify notify)
{
Callbacks *old_callbacks, *new_callbacks = NULL;
GstAppSinkPrivate *priv;
g_return_if_fail (GST_IS_APP_SINK (appsink));
g_return_if_fail (callbacks != NULL);
priv = appsink->priv;
if (callbacks) {
new_callbacks = g_new0 (Callbacks, 1);
new_callbacks->callbacks = *callbacks;
new_callbacks->user_data = user_data;
new_callbacks->destroy_notify = notify;
new_callbacks->ref_count = 1;
}
g_mutex_lock (&priv->mutex);
old_callbacks = g_steal_pointer (&priv->callbacks);
priv->callbacks = g_steal_pointer (&new_callbacks);
g_mutex_unlock (&priv->mutex);
g_clear_pointer (&old_callbacks, callbacks_unref);
}
/*** GSTURIHANDLER INTERFACE *************************************************/
static GstURIType
gst_app_sink_uri_get_type (GType type)
{
return GST_URI_SINK;
}
static const gchar *const *
gst_app_sink_uri_get_protocols (GType type)
{
static const gchar *protocols[] = { "appsink", NULL };
return protocols;
}
static gchar *
gst_app_sink_uri_get_uri (GstURIHandler * handler)
{
return g_strdup ("appsink");
}
static gboolean
gst_app_sink_uri_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
/* GstURIHandler checks the protocol for us */
return TRUE;
}
static void
gst_app_sink_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_app_sink_uri_get_type;
iface->get_protocols = gst_app_sink_uri_get_protocols;
iface->get_uri = gst_app_sink_uri_get_uri;
iface->set_uri = gst_app_sink_uri_set_uri;
}
static gboolean
gst_app_sink_propose_allocation (GstBaseSink * bsink, GstQuery * query)
{
gboolean ret = FALSE;
GstAppSink *appsink = GST_APP_SINK_CAST (bsink);
GstAppSinkPrivate *priv = appsink->priv;
Callbacks *callbacks = NULL;
gboolean emit;
g_mutex_lock (&priv->mutex);
emit = priv->emit_signals;
if (priv->callbacks)
callbacks = callbacks_ref (priv->callbacks);
g_mutex_unlock (&priv->mutex);
if (callbacks && callbacks->callbacks.propose_allocation) {
ret =
callbacks->callbacks.propose_allocation (appsink, query,
callbacks->user_data);
} else if (emit) {
g_signal_emit (appsink, gst_app_sink_signals[SIGNAL_PROPOSE_ALLOCATION], 0,
query, &ret);
}
g_clear_pointer (&callbacks, callbacks_unref);
return ret;
}
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