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gstreamer/gst-libs/gst/app/gstappsrc.c
Sebastian Dröge 8613525301 appsrc: Always take the mutex before flushing the queue 
Otherwise the application might push new buffers into the queue while we're
flushing, potentially causing the GQueue data structure to become inconsistent
and causing crashes soon after.

https://bugzilla.gnome.org/show_bug.cgi?id=754597
2015-09-09 12:33:02 +03:00

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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:gstappsrc
* @short_description: Easy way for applications to inject buffers into a
* pipeline
* @see_also: #GstBaseSrc, appsink
*
* The appsrc element can be used by applications to insert data into a
* GStreamer pipeline. Unlike most GStreamer elements, appsrc provides
* external API functions.
*
* appsrc can be used by linking with the libgstapp library to access the
* methods directly or by using the appsrc action signals.
*
* Before operating appsrc, the caps property must be set to fixed caps
* describing the format of the data that will be pushed with appsrc. An
* exception to this is when pushing buffers with unknown caps, in which case no
* caps should be set. This is typically true of file-like sources that push raw
* byte buffers. If you don't want to explicitly set the caps, you can use
* gst_app_src_push_sample. This method gets the caps associated with the
* sample and sets them on the appsrc replacing any previously set caps (if
* different from sample's caps).
*
* The main way of handing data to the appsrc element is by calling the
* gst_app_src_push_buffer() method or by emitting the push-buffer action signal.
* This will put the buffer onto a queue from which appsrc will read from in its
* streaming thread. It is important to note that data transport will not happen
* from the thread that performed the push-buffer call.
*
* The "max-bytes" property controls how much data can be queued in appsrc
* before appsrc considers the queue full. A filled internal queue will always
* signal the "enough-data" signal, which signals the application that it should
* stop pushing data into appsrc. The "block" property will cause appsrc to
* block the push-buffer method until free data becomes available again.
*
* When the internal queue is running out of data, the "need-data" signal is
* emitted, which signals the application that it should start pushing more data
* into appsrc.
*
* In addition to the "need-data" and "enough-data" signals, appsrc can emit the
* "seek-data" signal when the "stream-mode" property is set to "seekable" or
* "random-access". The signal argument will contain the new desired position in
* the stream expressed in the unit set with the "format" property. After
* receiving the seek-data signal, the application should push-buffers from the
* new position.
*
* These signals allow the application to operate the appsrc in two different
* ways:
*
* The push mode, in which the application repeatedly calls the push-buffer/push-sample
* method with a new buffer/sample. Optionally, the queue size in the appsrc
* can be controlled with the enough-data and need-data signals by respectively
* stopping/starting the push-buffer/push-sample calls. This is a typical
* mode of operation for the stream-type "stream" and "seekable". Use this
* mode when implementing various network protocols or hardware devices.
*
* The pull mode, in which the need-data signal triggers the next push-buffer call.
* This mode is typically used in the "random-access" stream-type. Use this
* mode for file access or other randomly accessable sources. In this mode, a
* buffer of exactly the amount of bytes given by the need-data signal should be
* pushed into appsrc.
*
* In all modes, the size property on appsrc should contain the total stream
* size in bytes. Setting this property is mandatory in the random-access mode.
* For the stream and seekable modes, setting this property is optional but
* recommended.
*
* When the application has finished pushing data into appsrc, it should call
* gst_app_src_end_of_stream() or emit the end-of-stream action signal. After
* this call, no more buffers can be pushed into appsrc until a flushing seek
* occurs or the state of the appsrc has gone through READY.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasesrc.h>
#include <string.h>
#include "gstapp-marshal.h"
#include "gstappsrc.h"
struct _GstAppSrcPrivate
{
GCond cond;
GMutex mutex;
GQueue *queue;
GstCaps *last_caps;
GstCaps *current_caps;
gint64 size;
GstAppStreamType stream_type;
guint64 max_bytes;
GstFormat format;
gboolean block;
gchar *uri;
gboolean flushing;
gboolean started;
gboolean is_eos;
guint64 queued_bytes;
guint64 offset;
GstAppStreamType current_type;
guint64 min_latency;
guint64 max_latency;
gboolean emit_signals;
guint min_percent;
GstAppSrcCallbacks callbacks;
gpointer user_data;
GDestroyNotify notify;
};
GST_DEBUG_CATEGORY_STATIC (app_src_debug);
#define GST_CAT_DEFAULT app_src_debug
enum
{
/* signals */
SIGNAL_NEED_DATA,
SIGNAL_ENOUGH_DATA,
SIGNAL_SEEK_DATA,
/* actions */
SIGNAL_PUSH_BUFFER,
SIGNAL_END_OF_STREAM,
SIGNAL_PUSH_SAMPLE,
LAST_SIGNAL
};
#define DEFAULT_PROP_SIZE -1
#define DEFAULT_PROP_STREAM_TYPE GST_APP_STREAM_TYPE_STREAM
#define DEFAULT_PROP_MAX_BYTES 200000
#define DEFAULT_PROP_FORMAT GST_FORMAT_BYTES
#define DEFAULT_PROP_BLOCK FALSE
#define DEFAULT_PROP_IS_LIVE FALSE
#define DEFAULT_PROP_MIN_LATENCY -1
#define DEFAULT_PROP_MAX_LATENCY -1
#define DEFAULT_PROP_EMIT_SIGNALS TRUE
#define DEFAULT_PROP_MIN_PERCENT 0
#define DEFAULT_PROP_CURRENT_LEVEL_BYTES 0
enum
{
PROP_0,
PROP_CAPS,
PROP_SIZE,
PROP_STREAM_TYPE,
PROP_MAX_BYTES,
PROP_FORMAT,
PROP_BLOCK,
PROP_IS_LIVE,
PROP_MIN_LATENCY,
PROP_MAX_LATENCY,
PROP_EMIT_SIGNALS,
PROP_MIN_PERCENT,
PROP_CURRENT_LEVEL_BYTES,
PROP_LAST
};
static GstStaticPadTemplate gst_app_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GType
gst_app_stream_type_get_type (void)
{
static volatile gsize stream_type_type = 0;
static const GEnumValue stream_type[] = {
{GST_APP_STREAM_TYPE_STREAM, "GST_APP_STREAM_TYPE_STREAM", "stream"},
{GST_APP_STREAM_TYPE_SEEKABLE, "GST_APP_STREAM_TYPE_SEEKABLE", "seekable"},
{GST_APP_STREAM_TYPE_RANDOM_ACCESS, "GST_APP_STREAM_TYPE_RANDOM_ACCESS",
"random-access"},
{0, NULL, NULL}
};
if (g_once_init_enter (&stream_type_type)) {
GType tmp = g_enum_register_static ("GstAppStreamType", stream_type);
g_once_init_leave (&stream_type_type, tmp);
}
return (GType) stream_type_type;
}
static void gst_app_src_uri_handler_init (gpointer g_iface,
gpointer iface_data);
static void gst_app_src_dispose (GObject * object);
static void gst_app_src_finalize (GObject * object);
static void gst_app_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_app_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_app_src_send_event (GstElement * element, GstEvent * event);
static void gst_app_src_set_latencies (GstAppSrc * appsrc,
gboolean do_min, guint64 min, gboolean do_max, guint64 max);
static gboolean gst_app_src_negotiate (GstBaseSrc * basesrc);
static GstCaps *gst_app_src_internal_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static GstFlowReturn gst_app_src_create (GstBaseSrc * bsrc, guint64 offset,
guint size, GstBuffer ** buf);
static gboolean gst_app_src_start (GstBaseSrc * bsrc);
static gboolean gst_app_src_stop (GstBaseSrc * bsrc);
static gboolean gst_app_src_unlock (GstBaseSrc * bsrc);
static gboolean gst_app_src_unlock_stop (GstBaseSrc * bsrc);
static gboolean gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment);
static gboolean gst_app_src_is_seekable (GstBaseSrc * src);
static gboolean gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size);
static gboolean gst_app_src_query (GstBaseSrc * src, GstQuery * query);
static GstFlowReturn gst_app_src_push_buffer_action (GstAppSrc * appsrc,
GstBuffer * buffer);
static GstFlowReturn gst_app_src_push_sample_action (GstAppSrc * appsrc,
GstSample * sample);
static guint gst_app_src_signals[LAST_SIGNAL] = { 0 };
#define gst_app_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstAppSrc, gst_app_src, GST_TYPE_BASE_SRC,
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_app_src_uri_handler_init));
static void
gst_app_src_class_init (GstAppSrcClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
GstBaseSrcClass *basesrc_class = (GstBaseSrcClass *) klass;
GST_DEBUG_CATEGORY_INIT (app_src_debug, "appsrc", 0, "appsrc element");
gobject_class->dispose = gst_app_src_dispose;
gobject_class->finalize = gst_app_src_finalize;
gobject_class->set_property = gst_app_src_set_property;
gobject_class->get_property = gst_app_src_get_property;
/**
* GstAppSrc::caps:
*
* The GstCaps that will negotiated downstream and will be put
* on outgoing buffers.
*/
g_object_class_install_property (gobject_class, PROP_CAPS,
g_param_spec_boxed ("caps", "Caps",
"The allowed caps for the src pad", GST_TYPE_CAPS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::format:
*
* The format to use for segment events. When the source is producing
* timestamped buffers this property should be set to GST_FORMAT_TIME.
*/
g_object_class_install_property (gobject_class, PROP_FORMAT,
g_param_spec_enum ("format", "Format",
"The format of the segment events and seek", GST_TYPE_FORMAT,
DEFAULT_PROP_FORMAT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::size:
*
* The total size in bytes of the data stream. If the total size is known, it
* is recommended to configure it with this property.
*/
g_object_class_install_property (gobject_class, PROP_SIZE,
g_param_spec_int64 ("size", "Size",
"The size of the data stream in bytes (-1 if unknown)",
-1, G_MAXINT64, DEFAULT_PROP_SIZE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::stream-type:
*
* The type of stream that this source is producing. For seekable streams the
* application should connect to the seek-data signal.
*/
g_object_class_install_property (gobject_class, PROP_STREAM_TYPE,
g_param_spec_enum ("stream-type", "Stream Type",
"the type of the stream", GST_TYPE_APP_STREAM_TYPE,
DEFAULT_PROP_STREAM_TYPE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::max-bytes:
*
* The maximum amount of bytes that can be queued internally.
* After the maximum amount of bytes are queued, appsrc will emit the
* "enough-data" signal.
*/
g_object_class_install_property (gobject_class, PROP_MAX_BYTES,
g_param_spec_uint64 ("max-bytes", "Max bytes",
"The maximum number of bytes to queue internally (0 = unlimited)",
0, G_MAXUINT64, DEFAULT_PROP_MAX_BYTES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::block:
*
* When max-bytes are queued and after the enough-data signal has been emitted,
* block any further push-buffer calls until the amount of queued bytes drops
* below the max-bytes limit.
*/
g_object_class_install_property (gobject_class, PROP_BLOCK,
g_param_spec_boolean ("block", "Block",
"Block push-buffer when max-bytes are queued",
DEFAULT_PROP_BLOCK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::is-live:
*
* Instruct the source to behave like a live source. This includes that it
* will only push out buffers in the PLAYING state.
*/
g_object_class_install_property (gobject_class, PROP_IS_LIVE,
g_param_spec_boolean ("is-live", "Is Live",
"Whether to act as a live source",
DEFAULT_PROP_IS_LIVE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::min-latency:
*
* The minimum latency of the source. A value of -1 will use the default
* latency calculations of #GstBaseSrc.
*/
g_object_class_install_property (gobject_class, PROP_MIN_LATENCY,
g_param_spec_int64 ("min-latency", "Min Latency",
"The minimum latency (-1 = default)",
-1, G_MAXINT64, DEFAULT_PROP_MIN_LATENCY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::max-latency:
*
* The maximum latency of the source. A value of -1 means an unlimited amout
* of latency.
*/
g_object_class_install_property (gobject_class, PROP_MAX_LATENCY,
g_param_spec_int64 ("max-latency", "Max Latency",
"The maximum latency (-1 = unlimited)",
-1, G_MAXINT64, DEFAULT_PROP_MAX_LATENCY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::emit-signals:
*
* Make appsrc emit the "need-data", "enough-data" and "seek-data" signals.
* This option is by default enabled for backwards compatibility reasons but
* can disabled when needed because signal emission is expensive.
*/
g_object_class_install_property (gobject_class, PROP_EMIT_SIGNALS,
g_param_spec_boolean ("emit-signals", "Emit signals",
"Emit need-data, enough-data and seek-data signals",
DEFAULT_PROP_EMIT_SIGNALS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::empty-percent:
*
* Make appsrc emit the "need-data" signal when the amount of bytes in the
* queue drops below this percentage of max-bytes.
*/
g_object_class_install_property (gobject_class, PROP_MIN_PERCENT,
g_param_spec_uint ("min-percent", "Min Percent",
"Emit need-data when queued bytes drops below this percent of max-bytes",
0, 100, DEFAULT_PROP_MIN_PERCENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::current-level-bytes:
*
* The number of currently queued bytes inside appsrc.
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_CURRENT_LEVEL_BYTES,
g_param_spec_uint64 ("current-level-bytes", "Current Level Bytes",
"The number of currently queued bytes",
0, G_MAXUINT64, DEFAULT_PROP_CURRENT_LEVEL_BYTES,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* GstAppSrc::need-data:
* @appsrc: the appsrc element that emitted the signal
* @length: the amount of bytes needed.
*
* Signal that the source needs more data. In the callback or from another
* thread you should call push-buffer or end-of-stream.
*
* @length is just a hint and when it is set to -1, any number of bytes can be
* pushed into @appsrc.
*
* You can call push-buffer multiple times until the enough-data signal is
* fired.
*/
gst_app_src_signals[SIGNAL_NEED_DATA] =
g_signal_new ("need-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAppSrcClass, need_data),
NULL, NULL, __gst_app_marshal_VOID__UINT, G_TYPE_NONE, 1, G_TYPE_UINT);
/**
* GstAppSrc::enough-data:
* @appsrc: the appsrc element that emitted the signal
*
* Signal that the source has enough data. It is recommended that the
* application stops calling push-buffer until the need-data signal is
* emitted again to avoid excessive buffer queueing.
*/
gst_app_src_signals[SIGNAL_ENOUGH_DATA] =
g_signal_new ("enough-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAppSrcClass, enough_data),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);
/**
* GstAppSrc::seek-data:
* @appsrc: the appsrc element that emitted the signal
* @offset: the offset to seek to
*
* Seek to the given offset. The next push-buffer should produce buffers from
* the new @offset.
* This callback is only called for seekable stream types.
*
* Returns: %TRUE if the seek succeeded.
*/
gst_app_src_signals[SIGNAL_SEEK_DATA] =
g_signal_new ("seek-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAppSrcClass, seek_data),
NULL, NULL, __gst_app_marshal_BOOLEAN__UINT64, G_TYPE_BOOLEAN, 1,
G_TYPE_UINT64);
/**
* GstAppSrc::push-buffer:
* @appsrc: the appsrc
* @buffer: a buffer to push
*
* Adds a buffer to the queue of buffers that the appsrc element will
* push to its source pad. This function does not take ownership of the
* buffer so the buffer needs to be unreffed after calling this function.
*
* When the block property is TRUE, this function can block until free space
* becomes available in the queue.
*/
gst_app_src_signals[SIGNAL_PUSH_BUFFER] =
g_signal_new ("push-buffer", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass,
push_buffer), NULL, NULL, __gst_app_marshal_ENUM__BOXED,
GST_TYPE_FLOW_RETURN, 1, GST_TYPE_BUFFER);
/**
* GstAppSrc::push-sample:
* @appsrc: the appsrc
* @sample: a sample from which extract buffer to push
*
* Extract a buffer from the provided sample and adds the extracted buffer
* to the queue of buffers that the appsrc element will
* push to its source pad. This function set the appsrc caps based on the caps
* in the sample and reset the caps if they change.
* Only the caps and the buffer of the provided sample are used and not
* for example the segment in the sample.
* This function does not take ownership of the
* sample so the sample needs to be unreffed after calling this function.
*
* When the block property is TRUE, this function can block until free space
* becomes available in the queue.
*
* Since: 1.6
*
*/
gst_app_src_signals[SIGNAL_PUSH_SAMPLE] =
g_signal_new ("push-sample", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass,
push_sample), NULL, NULL, __gst_app_marshal_ENUM__BOXED,
GST_TYPE_FLOW_RETURN, 1, GST_TYPE_SAMPLE);
/**
* GstAppSrc::end-of-stream:
* @appsrc: the appsrc
*
* Notify @appsrc that no more buffer are available.
*/
gst_app_src_signals[SIGNAL_END_OF_STREAM] =
g_signal_new ("end-of-stream", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass,
end_of_stream), NULL, NULL, __gst_app_marshal_ENUM__VOID,
GST_TYPE_FLOW_RETURN, 0, G_TYPE_NONE);
gst_element_class_set_static_metadata (element_class, "AppSrc",
"Generic/Source", "Allow the application to feed buffers to a pipeline",
"David Schleef <ds@schleef.org>, Wim Taymans <wim.taymans@gmail.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_app_src_template));
element_class->send_event = gst_app_src_send_event;
basesrc_class->negotiate = gst_app_src_negotiate;
basesrc_class->get_caps = gst_app_src_internal_get_caps;
basesrc_class->create = gst_app_src_create;
basesrc_class->start = gst_app_src_start;
basesrc_class->stop = gst_app_src_stop;
basesrc_class->unlock = gst_app_src_unlock;
basesrc_class->unlock_stop = gst_app_src_unlock_stop;
basesrc_class->do_seek = gst_app_src_do_seek;
basesrc_class->is_seekable = gst_app_src_is_seekable;
basesrc_class->get_size = gst_app_src_do_get_size;
basesrc_class->query = gst_app_src_query;
klass->push_buffer = gst_app_src_push_buffer_action;
klass->push_sample = gst_app_src_push_sample_action;
klass->end_of_stream = gst_app_src_end_of_stream;
g_type_class_add_private (klass, sizeof (GstAppSrcPrivate));
}
static void
gst_app_src_init (GstAppSrc * appsrc)
{
GstAppSrcPrivate *priv;
priv = appsrc->priv = G_TYPE_INSTANCE_GET_PRIVATE (appsrc, GST_TYPE_APP_SRC,
GstAppSrcPrivate);
g_mutex_init (&priv->mutex);
g_cond_init (&priv->cond);
priv->queue = g_queue_new ();
priv->size = DEFAULT_PROP_SIZE;
priv->stream_type = DEFAULT_PROP_STREAM_TYPE;
priv->max_bytes = DEFAULT_PROP_MAX_BYTES;
priv->format = DEFAULT_PROP_FORMAT;
priv->block = DEFAULT_PROP_BLOCK;
priv->min_latency = DEFAULT_PROP_MIN_LATENCY;
priv->max_latency = DEFAULT_PROP_MAX_LATENCY;
priv->emit_signals = DEFAULT_PROP_EMIT_SIGNALS;
priv->min_percent = DEFAULT_PROP_MIN_PERCENT;
gst_base_src_set_live (GST_BASE_SRC (appsrc), DEFAULT_PROP_IS_LIVE);
}
/* Must be called with priv->mutex */
static void
gst_app_src_flush_queued (GstAppSrc * src, gboolean retain_last_caps)
{
GstMiniObject *obj;
GstAppSrcPrivate *priv = src->priv;
GstCaps *requeue_caps = NULL;
while (!g_queue_is_empty (priv->queue)) {
obj = g_queue_pop_head (priv->queue);
if (obj) {
if (GST_IS_CAPS (obj) && retain_last_caps) {
gst_caps_replace (&requeue_caps, GST_CAPS_CAST (obj));
}
gst_mini_object_unref (obj);
}
}
if (requeue_caps) {
g_queue_push_tail (priv->queue, requeue_caps);
}
priv->queued_bytes = 0;
}
static void
gst_app_src_dispose (GObject * obj)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (obj);
GstAppSrcPrivate *priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
if (priv->current_caps) {
gst_caps_unref (priv->current_caps);
priv->current_caps = NULL;
}
if (priv->last_caps) {
gst_caps_unref (priv->last_caps);
priv->last_caps = NULL;
}
if (priv->notify) {
priv->notify (priv->user_data);
}
priv->user_data = NULL;
priv->notify = NULL;
GST_OBJECT_UNLOCK (appsrc);
g_mutex_lock (&priv->mutex);
gst_app_src_flush_queued (appsrc, FALSE);
g_mutex_unlock (&priv->mutex);
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_app_src_finalize (GObject * obj)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (obj);
GstAppSrcPrivate *priv = appsrc->priv;
g_mutex_clear (&priv->mutex);
g_cond_clear (&priv->cond);
g_queue_free (priv->queue);
g_free (priv->uri);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static GstCaps *
gst_app_src_internal_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstAppSrc *appsrc = GST_APP_SRC (bsrc);
GstCaps *caps;
GST_OBJECT_LOCK (appsrc);
if ((caps = appsrc->priv->current_caps))
gst_caps_ref (caps);
GST_OBJECT_UNLOCK (appsrc);
if (filter) {
if (caps) {
GstCaps *intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
} else {
caps = gst_caps_ref (filter);
}
}
GST_DEBUG_OBJECT (appsrc, "caps: %" GST_PTR_FORMAT, caps);
return caps;
}
static void
gst_app_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (object);
GstAppSrcPrivate *priv = appsrc->priv;
switch (prop_id) {
case PROP_CAPS:
gst_app_src_set_caps (appsrc, gst_value_get_caps (value));
break;
case PROP_SIZE:
gst_app_src_set_size (appsrc, g_value_get_int64 (value));
break;
case PROP_STREAM_TYPE:
gst_app_src_set_stream_type (appsrc, g_value_get_enum (value));
break;
case PROP_MAX_BYTES:
gst_app_src_set_max_bytes (appsrc, g_value_get_uint64 (value));
break;
case PROP_FORMAT:
priv->format = g_value_get_enum (value);
break;
case PROP_BLOCK:
priv->block = g_value_get_boolean (value);
break;
case PROP_IS_LIVE:
gst_base_src_set_live (GST_BASE_SRC (appsrc),
g_value_get_boolean (value));
break;
case PROP_MIN_LATENCY:
gst_app_src_set_latencies (appsrc, TRUE, g_value_get_int64 (value),
FALSE, -1);
break;
case PROP_MAX_LATENCY:
gst_app_src_set_latencies (appsrc, FALSE, -1, TRUE,
g_value_get_int64 (value));
break;
case PROP_EMIT_SIGNALS:
gst_app_src_set_emit_signals (appsrc, g_value_get_boolean (value));
break;
case PROP_MIN_PERCENT:
priv->min_percent = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_app_src_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (object);
GstAppSrcPrivate *priv = appsrc->priv;
switch (prop_id) {
case PROP_CAPS:
g_value_take_boxed (value, gst_app_src_get_caps (appsrc));
break;
case PROP_SIZE:
g_value_set_int64 (value, gst_app_src_get_size (appsrc));
break;
case PROP_STREAM_TYPE:
g_value_set_enum (value, gst_app_src_get_stream_type (appsrc));
break;
case PROP_MAX_BYTES:
g_value_set_uint64 (value, gst_app_src_get_max_bytes (appsrc));
break;
case PROP_FORMAT:
g_value_set_enum (value, priv->format);
break;
case PROP_BLOCK:
g_value_set_boolean (value, priv->block);
break;
case PROP_IS_LIVE:
g_value_set_boolean (value, gst_base_src_is_live (GST_BASE_SRC (appsrc)));
break;
case PROP_MIN_LATENCY:
{
guint64 min;
gst_app_src_get_latency (appsrc, &min, NULL);
g_value_set_int64 (value, min);
break;
}
case PROP_MAX_LATENCY:
{
guint64 max;
gst_app_src_get_latency (appsrc, NULL, &max);
g_value_set_int64 (value, max);
break;
}
case PROP_EMIT_SIGNALS:
g_value_set_boolean (value, gst_app_src_get_emit_signals (appsrc));
break;
case PROP_MIN_PERCENT:
g_value_set_uint (value, priv->min_percent);
break;
case PROP_CURRENT_LEVEL_BYTES:
g_value_set_uint64 (value, gst_app_src_get_current_level_bytes (appsrc));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_app_src_send_event (GstElement * element, GstEvent * event)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (element);
GstAppSrcPrivate *priv = appsrc->priv;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
g_mutex_lock (&priv->mutex);
gst_app_src_flush_queued (appsrc, TRUE);
g_mutex_unlock (&priv->mutex);
break;
default:
break;
}
return GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, send_event, (element,
event), FALSE);
}
static gboolean
gst_app_src_unlock (GstBaseSrc * bsrc)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
GstAppSrcPrivate *priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsrc, "unlock start");
priv->flushing = TRUE;
g_cond_broadcast (&priv->cond);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_src_unlock_stop (GstBaseSrc * bsrc)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
GstAppSrcPrivate *priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsrc, "unlock stop");
priv->flushing = FALSE;
g_cond_broadcast (&priv->cond);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_src_start (GstBaseSrc * bsrc)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
GstAppSrcPrivate *priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsrc, "starting");
priv->started = TRUE;
/* set the offset to -1 so that we always do a first seek. This is only used
* in random-access mode. */
priv->offset = -1;
priv->flushing = FALSE;
g_mutex_unlock (&priv->mutex);
gst_base_src_set_format (bsrc, priv->format);
return TRUE;
}
static gboolean
gst_app_src_stop (GstBaseSrc * bsrc)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
GstAppSrcPrivate *priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
GST_DEBUG_OBJECT (appsrc, "stopping");
priv->is_eos = FALSE;
priv->flushing = TRUE;
priv->started = FALSE;
gst_app_src_flush_queued (appsrc, TRUE);
g_cond_broadcast (&priv->cond);
g_mutex_unlock (&priv->mutex);
return TRUE;
}
static gboolean
gst_app_src_is_seekable (GstBaseSrc * src)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
GstAppSrcPrivate *priv = appsrc->priv;
gboolean res = FALSE;
switch (priv->stream_type) {
case GST_APP_STREAM_TYPE_STREAM:
break;
case GST_APP_STREAM_TYPE_SEEKABLE:
case GST_APP_STREAM_TYPE_RANDOM_ACCESS:
res = TRUE;
break;
}
return res;
}
static gboolean
gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
*size = gst_app_src_get_size (appsrc);
return TRUE;
}
static gboolean
gst_app_src_query (GstBaseSrc * src, GstQuery * query)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
GstAppSrcPrivate *priv = appsrc->priv;
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
GstClockTime min, max;
gboolean live;
/* Query the parent class for the defaults */
res = gst_base_src_query_latency (src, &live, &min, &max);
/* overwrite with our values when we need to */
g_mutex_lock (&priv->mutex);
if (priv->min_latency != -1) {
min = priv->min_latency;
max = priv->max_latency;
}
g_mutex_unlock (&priv->mutex);
gst_query_set_latency (query, live, min, max);
break;
}
case GST_QUERY_SCHEDULING:
{
gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0);
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
switch (priv->stream_type) {
case GST_APP_STREAM_TYPE_STREAM:
case GST_APP_STREAM_TYPE_SEEKABLE:
break;
case GST_APP_STREAM_TYPE_RANDOM_ACCESS:
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
break;
}
res = TRUE;
break;
}
default:
res = GST_BASE_SRC_CLASS (parent_class)->query (src, query);
break;
}
return res;
}
/* will be called in push mode */
static gboolean
gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
GstAppSrcPrivate *priv = appsrc->priv;
gint64 desired_position;
gboolean res = FALSE;
desired_position = segment->position;
/* no need to try to seek in streaming mode */
if (priv->stream_type == GST_APP_STREAM_TYPE_STREAM)
return TRUE;
GST_DEBUG_OBJECT (appsrc, "seeking to %" G_GINT64_FORMAT ", format %s",
desired_position, gst_format_get_name (segment->format));
if (priv->callbacks.seek_data)
res = priv->callbacks.seek_data (appsrc, desired_position, priv->user_data);
else {
gboolean emit;
g_mutex_lock (&priv->mutex);
emit = priv->emit_signals;
g_mutex_unlock (&priv->mutex);
if (emit)
g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0,
desired_position, &res);
}
if (res) {
GST_DEBUG_OBJECT (appsrc, "flushing queue");
g_mutex_lock (&priv->mutex);
gst_app_src_flush_queued (appsrc, TRUE);
g_mutex_unlock (&priv->mutex);
priv->is_eos = FALSE;
} else {
GST_WARNING_OBJECT (appsrc, "seek failed");
}
return res;
}
/* must be called with the appsrc mutex */
static gboolean
gst_app_src_emit_seek (GstAppSrc * appsrc, guint64 offset)
{
gboolean res = FALSE;
gboolean emit;
GstAppSrcPrivate *priv = appsrc->priv;
emit = priv->emit_signals;
g_mutex_unlock (&priv->mutex);
GST_DEBUG_OBJECT (appsrc,
"we are at %" G_GINT64_FORMAT ", seek to %" G_GINT64_FORMAT,
priv->offset, offset);
if (priv->callbacks.seek_data)
res = priv->callbacks.seek_data (appsrc, offset, priv->user_data);
else if (emit)
g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0,
offset, &res);
g_mutex_lock (&priv->mutex);
return res;
}
/* must be called with the appsrc mutex. After this call things can be
* flushing */
static void
gst_app_src_emit_need_data (GstAppSrc * appsrc, guint size)
{
gboolean emit;
GstAppSrcPrivate *priv = appsrc->priv;
emit = priv->emit_signals;
g_mutex_unlock (&priv->mutex);
/* we have no data, we need some. We fire the signal with the size hint. */
if (priv->callbacks.need_data)
priv->callbacks.need_data (appsrc, size, priv->user_data);
else if (emit)
g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_NEED_DATA], 0, size,
NULL);
g_mutex_lock (&priv->mutex);
/* we can be flushing now because we released the lock */
}
/* must be called with the appsrc mutex */
static gboolean
gst_app_src_do_negotiate (GstBaseSrc * basesrc)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (basesrc);
GstAppSrcPrivate *priv = appsrc->priv;
gboolean result;
GstCaps *caps;
GST_OBJECT_LOCK (basesrc);
caps = priv->current_caps ? gst_caps_ref (priv->current_caps) : NULL;
GST_OBJECT_UNLOCK (basesrc);
/* Avoid deadlock by unlocking mutex
* otherwise we get deadlock between this and stream lock */
g_mutex_unlock (&priv->mutex);
if (caps) {
result = gst_base_src_set_caps (basesrc, caps);
gst_caps_unref (caps);
} else {
result = GST_BASE_SRC_CLASS (parent_class)->negotiate (basesrc);
}
g_mutex_lock (&priv->mutex);
return result;
}
static gboolean
gst_app_src_negotiate (GstBaseSrc * basesrc)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (basesrc);
GstAppSrcPrivate *priv = appsrc->priv;
gboolean result;
g_mutex_lock (&priv->mutex);
result = gst_app_src_do_negotiate (basesrc);
g_mutex_unlock (&priv->mutex);
return result;
}
static GstFlowReturn
gst_app_src_create (GstBaseSrc * bsrc, guint64 offset, guint size,
GstBuffer ** buf)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
GstAppSrcPrivate *priv = appsrc->priv;
GstFlowReturn ret;
GST_OBJECT_LOCK (appsrc);
if (G_UNLIKELY (priv->size != bsrc->segment.duration &&
bsrc->segment.format == GST_FORMAT_BYTES)) {
GST_DEBUG_OBJECT (appsrc,
"Size changed from %" G_GINT64_FORMAT " to %" G_GINT64_FORMAT,
bsrc->segment.duration, priv->size);
bsrc->segment.duration = priv->size;
GST_OBJECT_UNLOCK (appsrc);
gst_element_post_message (GST_ELEMENT (appsrc),
gst_message_new_duration_changed (GST_OBJECT (appsrc)));
} else {
GST_OBJECT_UNLOCK (appsrc);
}
g_mutex_lock (&priv->mutex);
/* check flushing first */
if (G_UNLIKELY (priv->flushing))
goto flushing;
if (priv->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS) {
/* if we are dealing with a random-access stream, issue a seek if the offset
* changed. */
if (G_UNLIKELY (priv->offset != offset)) {
gboolean res;
/* do the seek */
res = gst_app_src_emit_seek (appsrc, offset);
if (G_UNLIKELY (!res))
/* failing to seek is fatal */
goto seek_error;
priv->offset = offset;
priv->is_eos = FALSE;
}
}
while (TRUE) {
/* return data as long as we have some */
if (!g_queue_is_empty (priv->queue)) {
guint buf_size;
GstMiniObject *obj = g_queue_pop_head (priv->queue);
if (!GST_IS_BUFFER (obj)) {
GstCaps *next_caps = GST_CAPS (obj);
gboolean caps_changed = TRUE;
if (next_caps && priv->current_caps)
caps_changed = !gst_caps_is_equal (next_caps, priv->current_caps);
else
caps_changed = (next_caps != priv->current_caps);
gst_caps_replace (&priv->current_caps, next_caps);
if (next_caps) {
gst_caps_unref (next_caps);
}
if (caps_changed)
gst_app_src_do_negotiate (bsrc);
/* Lock has released so now may need
*- flushing
*- new caps change
*- check queue has data */
if (G_UNLIKELY (priv->flushing))
goto flushing;
/* Continue checks caps and queue */
continue;
}
*buf = GST_BUFFER (obj);
buf_size = gst_buffer_get_size (*buf);
GST_DEBUG_OBJECT (appsrc, "we have buffer %p of size %u", *buf, buf_size);
priv->queued_bytes -= buf_size;
/* only update the offset when in random_access mode */
if (priv->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS)
priv->offset += buf_size;
/* signal that we removed an item */
g_cond_broadcast (&priv->cond);
/* see if we go lower than the empty-percent */
if (priv->min_percent && priv->max_bytes) {
if (priv->queued_bytes * 100 / priv->max_bytes <= priv->min_percent)
/* ignore flushing state, we got a buffer and we will return it now.
* Errors will be handled in the next round */
gst_app_src_emit_need_data (appsrc, size);
}
ret = GST_FLOW_OK;
break;
} else {
gst_app_src_emit_need_data (appsrc, size);
/* we can be flushing now because we released the lock above */
if (G_UNLIKELY (priv->flushing))
goto flushing;
/* if we have a buffer now, continue the loop and try to return it. In
* random-access mode (where a buffer is normally pushed in the above
* signal) we can still be empty because the pushed buffer got flushed or
* when the application pushes the requested buffer later, we support both
* possibilities. */
if (!g_queue_is_empty (priv->queue))
continue;
/* no buffer yet, maybe we are EOS, if not, block for more data. */
}
/* check EOS */
if (G_UNLIKELY (priv->is_eos))
goto eos;
/* nothing to return, wait a while for new data or flushing. */
g_cond_wait (&priv->cond, &priv->mutex);
}
g_mutex_unlock (&priv->mutex);
return ret;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (appsrc, "we are flushing");
g_mutex_unlock (&priv->mutex);
return GST_FLOW_FLUSHING;
}
eos:
{
GST_DEBUG_OBJECT (appsrc, "we are EOS");
g_mutex_unlock (&priv->mutex);
return GST_FLOW_EOS;
}
seek_error:
{
g_mutex_unlock (&priv->mutex);
GST_ELEMENT_ERROR (appsrc, RESOURCE, READ, ("failed to seek"),
GST_ERROR_SYSTEM);
return GST_FLOW_ERROR;
}
}
/* external API */
/**
* gst_app_src_set_caps:
* @appsrc: a #GstAppSrc
* @caps: caps to set
*
* Set the capabilities on the appsrc element. This function takes
* a copy of the caps structure. After calling this method, the source will
* only produce caps that match @caps. @caps must be fixed and the caps on the
* buffers must match the caps or left NULL.
*/
void
gst_app_src_set_caps (GstAppSrc * appsrc, const GstCaps * caps)
{
GstAppSrcPrivate *priv;
gboolean caps_changed;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
GST_OBJECT_LOCK (appsrc);
if (caps && priv->last_caps)
caps_changed = !gst_caps_is_equal (caps, priv->last_caps);
else
caps_changed = (caps != priv->last_caps);
if (caps_changed) {
GstCaps *new_caps;
new_caps = caps ? gst_caps_copy (caps) : NULL;
GST_DEBUG_OBJECT (appsrc, "setting caps to %" GST_PTR_FORMAT, caps);
if (priv->queue->tail != NULL && GST_IS_CAPS (priv->queue->tail->data)) {
gst_caps_unref (g_queue_pop_tail (priv->queue));
}
g_queue_push_tail (priv->queue, new_caps);
gst_caps_replace (&priv->last_caps, new_caps);
}
GST_OBJECT_UNLOCK (appsrc);
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_src_get_caps:
* @appsrc: a #GstAppSrc
*
* Get the configured caps on @appsrc.
*
* Returns: the #GstCaps produced by the source. gst_caps_unref() after usage.
*/
GstCaps *
gst_app_src_get_caps (GstAppSrc * appsrc)
{
GstCaps *caps;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), NULL);
GST_OBJECT_LOCK (appsrc);
if ((caps = appsrc->priv->last_caps))
gst_caps_ref (caps);
GST_OBJECT_UNLOCK (appsrc);
return caps;
}
/**
* gst_app_src_set_size:
* @appsrc: a #GstAppSrc
* @size: the size to set
*
* Set the size of the stream in bytes. A value of -1 means that the size is
* not known.
*/
void
gst_app_src_set_size (GstAppSrc * appsrc, gint64 size)
{
GstAppSrcPrivate *priv;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
GST_DEBUG_OBJECT (appsrc, "setting size of %" G_GINT64_FORMAT, size);
priv->size = size;
GST_OBJECT_UNLOCK (appsrc);
}
/**
* gst_app_src_get_size:
* @appsrc: a #GstAppSrc
*
* Get the size of the stream in bytes. A value of -1 means that the size is
* not known.
*
* Returns: the size of the stream previously set with gst_app_src_set_size();
*/
gint64
gst_app_src_get_size (GstAppSrc * appsrc)
{
gint64 size;
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), -1);
priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
size = priv->size;
GST_DEBUG_OBJECT (appsrc, "getting size of %" G_GINT64_FORMAT, size);
GST_OBJECT_UNLOCK (appsrc);
return size;
}
/**
* gst_app_src_set_stream_type:
* @appsrc: a #GstAppSrc
* @type: the new state
*
* Set the stream type on @appsrc. For seekable streams, the "seek" signal must
* be connected to.
*
* A stream_type stream
*/
void
gst_app_src_set_stream_type (GstAppSrc * appsrc, GstAppStreamType type)
{
GstAppSrcPrivate *priv;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
GST_DEBUG_OBJECT (appsrc, "setting stream_type of %d", type);
priv->stream_type = type;
GST_OBJECT_UNLOCK (appsrc);
}
/**
* gst_app_src_get_stream_type:
* @appsrc: a #GstAppSrc
*
* Get the stream type. Control the stream type of @appsrc
* with gst_app_src_set_stream_type().
*
* Returns: the stream type.
*/
GstAppStreamType
gst_app_src_get_stream_type (GstAppSrc * appsrc)
{
gboolean stream_type;
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), FALSE);
priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
stream_type = priv->stream_type;
GST_DEBUG_OBJECT (appsrc, "getting stream_type of %d", stream_type);
GST_OBJECT_UNLOCK (appsrc);
return stream_type;
}
/**
* gst_app_src_set_max_bytes:
* @appsrc: a #GstAppSrc
* @max: the maximum number of bytes to queue
*
* Set the maximum amount of bytes that can be queued in @appsrc.
* After the maximum amount of bytes are queued, @appsrc will emit the
* "enough-data" signal.
*/
void
gst_app_src_set_max_bytes (GstAppSrc * appsrc, guint64 max)
{
GstAppSrcPrivate *priv;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
if (max != priv->max_bytes) {
GST_DEBUG_OBJECT (appsrc, "setting max-bytes to %" G_GUINT64_FORMAT, max);
priv->max_bytes = max;
/* signal the change */
g_cond_broadcast (&priv->cond);
}
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_src_get_max_bytes:
* @appsrc: a #GstAppSrc
*
* Get the maximum amount of bytes that can be queued in @appsrc.
*
* Returns: The maximum amount of bytes that can be queued.
*/
guint64
gst_app_src_get_max_bytes (GstAppSrc * appsrc)
{
guint64 result;
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), 0);
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
result = priv->max_bytes;
GST_DEBUG_OBJECT (appsrc, "getting max-bytes of %" G_GUINT64_FORMAT, result);
g_mutex_unlock (&priv->mutex);
return result;
}
/**
* gst_app_src_get_current_level_bytes:
* @appsrc: a #GstAppSrc
*
* Get the number of currently queued bytes inside @appsrc.
*
* Returns: The number of currently queued bytes.
*
* Since: 1.2
*/
guint64
gst_app_src_get_current_level_bytes (GstAppSrc * appsrc)
{
gint64 queued;
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), -1);
priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
queued = priv->queued_bytes;
GST_DEBUG_OBJECT (appsrc, "current level bytes is %" G_GUINT64_FORMAT,
queued);
GST_OBJECT_UNLOCK (appsrc);
return queued;
}
static void
gst_app_src_set_latencies (GstAppSrc * appsrc, gboolean do_min, guint64 min,
gboolean do_max, guint64 max)
{
GstAppSrcPrivate *priv = appsrc->priv;
gboolean changed = FALSE;
g_mutex_lock (&priv->mutex);
if (do_min && priv->min_latency != min) {
priv->min_latency = min;
changed = TRUE;
}
if (do_max && priv->max_latency != max) {
priv->max_latency = max;
changed = TRUE;
}
g_mutex_unlock (&priv->mutex);
if (changed) {
GST_DEBUG_OBJECT (appsrc, "posting latency changed");
gst_element_post_message (GST_ELEMENT_CAST (appsrc),
gst_message_new_latency (GST_OBJECT_CAST (appsrc)));
}
}
/**
* gst_app_src_set_latency:
* @appsrc: a #GstAppSrc
* @min: the min latency
* @max: the min latency
*
* Configure the @min and @max latency in @src. If @min is set to -1, the
* default latency calculations for pseudo-live sources will be used.
*/
void
gst_app_src_set_latency (GstAppSrc * appsrc, guint64 min, guint64 max)
{
gst_app_src_set_latencies (appsrc, TRUE, min, TRUE, max);
}
/**
* gst_app_src_get_latency:
* @appsrc: a #GstAppSrc
* @min: the min latency
* @max: the min latency
*
* Retrieve the min and max latencies in @min and @max respectively.
*/
void
gst_app_src_get_latency (GstAppSrc * appsrc, guint64 * min, guint64 * max)
{
GstAppSrcPrivate *priv;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
if (min)
*min = priv->min_latency;
if (max)
*max = priv->max_latency;
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_src_set_emit_signals:
* @appsrc: a #GstAppSrc
* @emit: the new state
*
* Make appsrc emit the "new-preroll" and "new-buffer" 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_src_set_emit_signals (GstAppSrc * appsrc, gboolean emit)
{
GstAppSrcPrivate *priv;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
priv->emit_signals = emit;
g_mutex_unlock (&priv->mutex);
}
/**
* gst_app_src_get_emit_signals:
* @appsrc: a #GstAppSrc
*
* Check if appsrc will emit the "new-preroll" and "new-buffer" signals.
*
* Returns: %TRUE if @appsrc is emitting the "new-preroll" and "new-buffer"
* signals.
*/
gboolean
gst_app_src_get_emit_signals (GstAppSrc * appsrc)
{
gboolean result;
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), FALSE);
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
result = priv->emit_signals;
g_mutex_unlock (&priv->mutex);
return result;
}
static GstFlowReturn
gst_app_src_push_buffer_full (GstAppSrc * appsrc, GstBuffer * buffer,
gboolean steal_ref)
{
gboolean first = TRUE;
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), GST_FLOW_ERROR);
g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
while (TRUE) {
/* can't accept buffers when we are flushing or EOS */
if (priv->flushing)
goto flushing;
if (priv->is_eos)
goto eos;
if (priv->max_bytes && priv->queued_bytes >= priv->max_bytes) {
GST_DEBUG_OBJECT (appsrc,
"queue filled (%" G_GUINT64_FORMAT " >= %" G_GUINT64_FORMAT ")",
priv->queued_bytes, priv->max_bytes);
if (first) {
gboolean emit;
emit = priv->emit_signals;
/* only signal on the first push */
g_mutex_unlock (&priv->mutex);
if (priv->callbacks.enough_data)
priv->callbacks.enough_data (appsrc, priv->user_data);
else if (emit)
g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_ENOUGH_DATA], 0,
NULL);
g_mutex_lock (&priv->mutex);
/* continue to check for flushing/eos after releasing the lock */
first = FALSE;
continue;
}
if (priv->block) {
GST_DEBUG_OBJECT (appsrc, "waiting for free space");
/* we are filled, wait until a buffer gets popped or when we
* flush. */
g_cond_wait (&priv->cond, &priv->mutex);
} else {
/* no need to wait for free space, we just pump more data into the
* queue hoping that the caller reacts to the enough-data signal and
* stops pushing buffers. */
break;
}
} else
break;
}
GST_DEBUG_OBJECT (appsrc, "queueing buffer %p", buffer);
if (!steal_ref)
gst_buffer_ref (buffer);
g_queue_push_tail (priv->queue, buffer);
priv->queued_bytes += gst_buffer_get_size (buffer);
g_cond_broadcast (&priv->cond);
g_mutex_unlock (&priv->mutex);
return GST_FLOW_OK;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (appsrc, "refuse buffer %p, we are flushing", buffer);
if (steal_ref)
gst_buffer_unref (buffer);
g_mutex_unlock (&priv->mutex);
return GST_FLOW_FLUSHING;
}
eos:
{
GST_DEBUG_OBJECT (appsrc, "refuse buffer %p, we are EOS", buffer);
if (steal_ref)
gst_buffer_unref (buffer);
g_mutex_unlock (&priv->mutex);
return GST_FLOW_EOS;
}
}
static GstFlowReturn
gst_app_src_push_sample_internal (GstAppSrc * appsrc, GstSample * sample)
{
GstBuffer *buffer;
GstCaps *caps;
g_return_val_if_fail (GST_IS_SAMPLE (sample), GST_FLOW_ERROR);
caps = gst_sample_get_caps (sample);
if (caps != NULL) {
gst_app_src_set_caps (appsrc, caps);
} else {
GST_WARNING_OBJECT (appsrc, "received sample without caps");
}
buffer = gst_sample_get_buffer (sample);
if (buffer == NULL) {
GST_WARNING_OBJECT (appsrc, "received sample without buffer");
return GST_FLOW_OK;
}
return gst_app_src_push_buffer_full (appsrc, buffer, FALSE);
}
/**
* gst_app_src_push_buffer:
* @appsrc: a #GstAppSrc
* @buffer: (transfer full): a #GstBuffer to push
*
* Adds a buffer to the queue of buffers that the appsrc element will
* push to its source pad. This function takes ownership of the buffer.
*
* When the block property is TRUE, this function can block until free
* space becomes available in the queue.
*
* Returns: #GST_FLOW_OK when the buffer was successfuly queued.
* #GST_FLOW_FLUSHING when @appsrc is not PAUSED or PLAYING.
* #GST_FLOW_EOS when EOS occured.
*/
GstFlowReturn
gst_app_src_push_buffer (GstAppSrc * appsrc, GstBuffer * buffer)
{
return gst_app_src_push_buffer_full (appsrc, buffer, TRUE);
}
/**
* gst_app_src_push_sample:
* @appsrc: a #GstAppSrc
* @sample: (transfer none): a #GstSample from wich extract buffer to
* push and caps to set
*
* Extract a buffer from the provided sample and adds it to the queue of
* buffers that the appsrc element will push to its source pad. Any
* previous caps setted on appsrc will be replaced by the caps associated
* with the sample if not equal.
*
* When the block property is TRUE, this function can block until free
* space becomes available in the queue.
*
* Returns: #GST_FLOW_OK when the buffer was successfuly queued.
* #GST_FLOW_FLUSHING when @appsrc is not PAUSED or PLAYING.
* #GST_FLOW_EOS when EOS occured.
*
* Since: 1.6
*
*/
GstFlowReturn
gst_app_src_push_sample (GstAppSrc * appsrc, GstSample * sample)
{
return gst_app_src_push_sample_internal (appsrc, sample);
}
/* push a buffer without stealing the ref of the buffer. This is used for the
* action signal. */
static GstFlowReturn
gst_app_src_push_buffer_action (GstAppSrc * appsrc, GstBuffer * buffer)
{
return gst_app_src_push_buffer_full (appsrc, buffer, FALSE);
}
/* push a sample without stealing the ref. This is used for the
* action signal. */
static GstFlowReturn
gst_app_src_push_sample_action (GstAppSrc * appsrc, GstSample * sample)
{
return gst_app_src_push_sample_internal (appsrc, sample);
}
/**
* gst_app_src_end_of_stream:
* @appsrc: a #GstAppSrc
*
* Indicates to the appsrc element that the last buffer queued in the
* element is the last buffer of the stream.
*
* Returns: #GST_FLOW_OK when the EOS was successfuly queued.
* #GST_FLOW_FLUSHING when @appsrc is not PAUSED or PLAYING.
*/
GstFlowReturn
gst_app_src_end_of_stream (GstAppSrc * appsrc)
{
GstAppSrcPrivate *priv;
g_return_val_if_fail (GST_IS_APP_SRC (appsrc), GST_FLOW_ERROR);
priv = appsrc->priv;
g_mutex_lock (&priv->mutex);
/* can't accept buffers when we are flushing. We can accept them when we are
* EOS although it will not do anything. */
if (priv->flushing)
goto flushing;
GST_DEBUG_OBJECT (appsrc, "sending EOS");
priv->is_eos = TRUE;
g_cond_broadcast (&priv->cond);
g_mutex_unlock (&priv->mutex);
return GST_FLOW_OK;
/* ERRORS */
flushing:
{
g_mutex_unlock (&priv->mutex);
GST_DEBUG_OBJECT (appsrc, "refuse EOS, we are flushing");
return GST_FLOW_FLUSHING;
}
}
/**
* gst_app_src_set_callbacks: (skip)
* @appsrc: a #GstAppSrc
* @callbacks: the callbacks
* @user_data: a user_data argument for the callbacks
* @notify: a destroy notify function
*
* Set callbacks which will be executed when data is needed, enough data has
* been collected or when a seek should be performed.
* 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.
*/
void
gst_app_src_set_callbacks (GstAppSrc * appsrc,
GstAppSrcCallbacks * callbacks, gpointer user_data, GDestroyNotify notify)
{
GDestroyNotify old_notify;
GstAppSrcPrivate *priv;
g_return_if_fail (GST_IS_APP_SRC (appsrc));
g_return_if_fail (callbacks != NULL);
priv = appsrc->priv;
GST_OBJECT_LOCK (appsrc);
old_notify = priv->notify;
if (old_notify) {
gpointer old_data;
old_data = priv->user_data;
priv->user_data = NULL;
priv->notify = NULL;
GST_OBJECT_UNLOCK (appsrc);
old_notify (old_data);
GST_OBJECT_LOCK (appsrc);
}
priv->callbacks = *callbacks;
priv->user_data = user_data;
priv->notify = notify;
GST_OBJECT_UNLOCK (appsrc);
}
/*** GSTURIHANDLER INTERFACE *************************************************/
static GstURIType
gst_app_src_uri_get_type (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_app_src_uri_get_protocols (GType type)
{
static const gchar *protocols[] = { "appsrc", NULL };
return protocols;
}
static gchar *
gst_app_src_uri_get_uri (GstURIHandler * handler)
{
GstAppSrc *appsrc = GST_APP_SRC (handler);
return appsrc->priv->uri ? g_strdup (appsrc->priv->uri) : NULL;
}
static gboolean
gst_app_src_uri_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
GstAppSrc *appsrc = GST_APP_SRC (handler);
g_free (appsrc->priv->uri);
appsrc->priv->uri = uri ? g_strdup (uri) : NULL;
return TRUE;
}
static void
gst_app_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_app_src_uri_get_type;
iface->get_protocols = gst_app_src_uri_get_protocols;
iface->get_uri = gst_app_src_uri_get_uri;
iface->set_uri = gst_app_src_uri_set_uri;
}
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