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#ifndef _GSTREAMERMM_BASESRC_H
#define _GSTREAMERMM_BASESRC_H
#include <glibmm/ustring.h>
#include <sigc++/sigc++.h>
/* gstreamermm - a C++ wrapper for gstreamer
*
* Copyright 2008-2016 The gstreamermm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <gst/base/gstbasesrc.h>
#include <gstreamermm/element.h>
#include <gstreamermm/pad.h>
#include <gstreamermm/format.h>
#include <gstreamermm/clock.h>
#include <gstreamermm/segment.h>
#ifndef DOXYGEN_SHOULD_SKIP_THIS
using GstBaseSrc = struct _GstBaseSrc;
using GstBaseSrcClass = struct _GstBaseSrcClass;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Gst
{ class BaseSrc_Class; } // namespace Gst
#endif //DOXYGEN_SHOULD_SKIP_THIS
namespace Gst
{
/** @addtogroup gstreamermmEnums gstreamermm Enums and Flags */
/**
* @var BaseSrcFlags BASE_SRC_FLAG_STARTING
* Has source is starting.
*
* @var BaseSrcFlags BASE_SRC_FLAG_STARTED
* Has source been started.
*
* @var BaseSrcFlags BASE_SRC_FLAG_LAST
* Offset to define more flags.
*
* @enum BaseSrcFlags
*
* The Gst::Element flags that a basesrc element may have.
*
* @ingroup gstreamermmEnums
* @par Bitwise operators:
* <tt>%BaseSrcFlags operator|(BaseSrcFlags, BaseSrcFlags)</tt><br>
* <tt>%BaseSrcFlags operator&(BaseSrcFlags, BaseSrcFlags)</tt><br>
* <tt>%BaseSrcFlags operator^(BaseSrcFlags, BaseSrcFlags)</tt><br>
* <tt>%BaseSrcFlags operator~(BaseSrcFlags)</tt><br>
* <tt>%BaseSrcFlags& operator|=(BaseSrcFlags&, BaseSrcFlags)</tt><br>
* <tt>%BaseSrcFlags& operator&=(BaseSrcFlags&, BaseSrcFlags)</tt><br>
* <tt>%BaseSrcFlags& operator^=(BaseSrcFlags&, BaseSrcFlags)</tt><br>
*/
enum BaseSrcFlags
{
BASE_SRC_FLAG_STARTING = (((GST_OBJECT_FLAG_LAST << 10)) << 0),
BASE_SRC_FLAG_STARTED = (((GST_OBJECT_FLAG_LAST << 10)) << 1),
BASE_SRC_FLAG_LAST = (((GST_OBJECT_FLAG_LAST << 10)) << 6)
};
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags operator|(BaseSrcFlags lhs, BaseSrcFlags rhs)
{ return static_cast<BaseSrcFlags>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs)); }
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags operator&(BaseSrcFlags lhs, BaseSrcFlags rhs)
{ return static_cast<BaseSrcFlags>(static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs)); }
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags operator^(BaseSrcFlags lhs, BaseSrcFlags rhs)
{ return static_cast<BaseSrcFlags>(static_cast<unsigned>(lhs) ^ static_cast<unsigned>(rhs)); }
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags operator~(BaseSrcFlags flags)
{ return static_cast<BaseSrcFlags>(~static_cast<unsigned>(flags)); }
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags& operator|=(BaseSrcFlags& lhs, BaseSrcFlags rhs)
{ return (lhs = static_cast<BaseSrcFlags>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs))); }
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags& operator&=(BaseSrcFlags& lhs, BaseSrcFlags rhs)
{ return (lhs = static_cast<BaseSrcFlags>(static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs))); }
/** @ingroup gstreamermmEnums */
inline BaseSrcFlags& operator^=(BaseSrcFlags& lhs, BaseSrcFlags rhs)
{ return (lhs = static_cast<BaseSrcFlags>(static_cast<unsigned>(lhs) ^ static_cast<unsigned>(rhs))); }
/** A base class for getrange based source elements.
*
* This is a generice base class for source elements. The following types of
* sources are supported:
*
* - random access sources like files,
* - seekable sources,
* - live sources.
*
* The source can be configured to operate in any Gst::Format with the
* set_format() method. The currently set format determines the format of the
* internal Gst::Segment and any Gst::EVENT_NEWSEGMENT events. The default
* format for Gst::BaseSrc is Gst::FORMAT_BYTES.
*
* Gst::BaseSrc always supports push mode scheduling. If the following
* conditions are met, it also supports pull mode scheduling:
*
* - The format is set to Gst::FORMAT_BYTES (default).
* - Gst::BaseSrc::is_seekable_vfunc() returns TRUE.
*
* Since GStreamer 0.10.9, any Gst::BaseSrc can enable pull based scheduling at
* any time by overriding Gst::BaseSrc::check_get_range_vfunc() so that it
* returns TRUE.
*
* If all the conditions are met for operating in pull mode, Gst::BaseSrc is
* automatically seekable in push mode as well. The following conditions must
* be met to make the element seekable in push mode when the format is not
* Gst::FORMAT_BYTES:
*
* - Gst::BaseSrc::is_seekable_vfunc() returns TRUE.
* - Gst::BaseSrc::query_vfunc() can convert all supported seek formats to
* the internal format as set with set_format().
* - Gst::BaseSrc::do_seek_vfunc() is implemented, performs the seek and
* returns TRUE.
*
* When the element does not meet the requirements to operate in pull mode, the
* offset and length in the Gst::BaseSrc::create_vfunc() method should be
* ignored. It is recommended to subclass Gst::PushSrc instead, in this
* situation. If the element can operate in pull mode but only with specific
* offsets and lengths, it is allowed to generate an error when the wrong
* values are passed to the Gst::BaseSrc::create_vfunc() function.
*
* Gst::BaseSrc has support for live sources. Live sources are sources that
* when paused discard data, such as audio or video capture devices. A typical
* live source also produces data at a fixed rate and thus provides a clock to
* publish this rate. Use set_live() to activate the live source mode.
*
* A live source does not produce data in the PAUSED state. This means that the
* Gst::BaseSrc::create_vfunc() method will not be called in PAUSED but only in
* PLAYING. To signal the pipeline that the element will not produce data, the
* return value from the READY to PAUSED state will be
* Gst::STATE_CHANGE_NO_PREROLL.
*
* A typical live source will timestamp the buffers it creates with the current
* running time of the pipeline. This is one reason why a live source can only
* produce data in the PLAYING state, when the clock is actually distributed
* and running.
*
* Live sources that synchronize and block on the clock (an audio source, for
* example) can since GStreamer 0.10.12 use wait_playing() when the
* create_vfunc() function was interrupted by a state change to PAUSED.
*
* The Gst::BaseSrc::get_times_vfunc() method can be used to implement
* pseudo-live sources. It only makes sense to implement the get_times_vfunc()
* function if the source is a live source. The get_times_vfunc() function
* should return timestamps starting from 0, as if it were a non-live source.
* The base class will make sure that the timestamps are transformed into the
* current running_time. The base source will then wait for the calculated
* running_time before pushing out the buffer.
*
* For live sources, the base class will by default report a latency of 0. For
* pseudo live sources, the base class will by default measure the difference
* between the first buffer timestamp and the start time of get_times_vfunc()
* and will report this value as the latency. Subclasses should override the
* query_vfunc() function when this behaviour is not acceptable.
*
* TODO: Edit below paragraph for C++ and include C++ example from C API (if
* necessary):
*
* There is only support in Gst::BaseSrc for exactly one source pad, which
* should be named "src". A source implementation (subclass of Gst::BaseSrc)
* should install a pad template in its class_init function, like so:
* @code
* // static
* void SampleBaseSrc::base_init(Gst::ElementClass<SampleBaseSrc> *klass)
* {
* klass->add_pad_template(Gst::PadTemplate::create(
* "src",
* Gst::PAD_SRC,
* Gst::PAD_ALWAYS,
* Gst::Caps::create_from_string("x-application/x-foo1")
* ));
*
* klass->set_metadata("Source name", "Source", "My source element", "The author <my.sink@my.email>");
* }
* @endcode
*
* <H2>Controlled shutdown of live sources in applications</H2>
*
* Applications that record from a live source may want to stop recording in a
* controlled way, so that the recording is stopped, but the data already in
* the pipeline is processed to the end (remember that many live sources would
* go on recording forever otherwise). For that to happen the application needs
* to make the source stop recording and send an EOS event down the pipeline.
* The application would then wait for an EOS message posted on the pipeline's
* bus to know when all data has been processed and the pipeline can safely be
* stopped.
*
* Since GStreamer 0.10.16 an application may send an EOS event to a source
* element to make it perform the EOS logic (send EOS event downstream or post
* a Gst::MESSAGE_SEGMENT_DONE on the bus). This can typically be done with the
* Gst::Element::send_event() function on the element or its parent bin.
*
* After the EOS has been sent to the element, the application should wait for
* an EOS message to be posted on the pipeline's bus. Once this EOS message is
* received, it may safely shut down the entire pipeline.
*
* The old behaviour for controlled shutdown introduced since GStreamer 0.10.3
* is still available but deprecated as it is dangerous and less flexible.
*
* Last reviewed on 2016-05-05 (1.8.0).
*
* @ingroup GstBaseClasses
*/
class BaseSrc
: public Element
{
#ifndef DOXYGEN_SHOULD_SKIP_THIS
public:
using CppObjectType = BaseSrc;
using CppClassType = BaseSrc_Class;
using BaseObjectType = GstBaseSrc;
using BaseClassType = GstBaseSrcClass;
// noncopyable
BaseSrc(const BaseSrc&) = delete;
BaseSrc& operator=(const BaseSrc&) = delete;
private: friend class BaseSrc_Class;
static CppClassType basesrc_class_;
protected:
explicit BaseSrc(const Glib::ConstructParams& construct_params);
explicit BaseSrc(GstBaseSrc* castitem);
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
public:
BaseSrc(BaseSrc&& src) noexcept;
BaseSrc& operator=(BaseSrc&& src) noexcept;
~BaseSrc() noexcept override;
/** Get the GType for this class, for use with the underlying GObject type system.
*/
static GType get_type() G_GNUC_CONST;
#ifndef DOXYGEN_SHOULD_SKIP_THIS
static GType get_base_type() G_GNUC_CONST;
#endif
///Provides access to the underlying C GObject.
GstBaseSrc* gobj() { return reinterpret_cast<GstBaseSrc*>(gobject_); }
///Provides access to the underlying C GObject.
const GstBaseSrc* gobj() const { return reinterpret_cast<GstBaseSrc*>(gobject_); }
///Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
GstBaseSrc* gobj_copy();
private:
public:
/** If the Gst::BaseSrcClass.create() method performs its own synchronisation
* against the clock it must unblock when going from PLAYING to the PAUSED state
* and call this method before continuing to produce the remaining data.
*
* This function will block until a state change to PLAYING happens (in which
* case this function returns Gst::FLOW_OK) or the processing must be stopped due
* to a state change to READY or a FLUSH event (in which case this function
* returns Gst::FLOW_FLUSHING).
*
* @return Gst::FLOW_OK if @a src is PLAYING and processing can
* continue. Any other return value should be returned from the create vmethod.
*/
FlowReturn wait_playing();
/** Check if an element is in live mode.
*
* @return <tt>true</tt> if element is in live mode.
*/
bool is_live() const;
/** If the element listens to a live source, @a live should
* be set to <tt>true</tt>.
*
* A live source will not produce data in the PAUSED state and
* will therefore not be able to participate in the PREROLL phase
* of a pipeline. To signal this fact to the application and the
* pipeline, the state change return value of the live source will
* be GST_STATE_CHANGE_NO_PREROLL.
*
* @param live New live-mode.
*/
void set_live(bool live);
/** Sets the default format of the source. This will be the format used
* for sending SEGMENT events and for performing seeks.
*
* If a format of GST_FORMAT_BYTES is set, the element will be able to
* operate in pull mode if the Gst::BaseSrcClass.is_seekable() returns <tt>true</tt>.
*
* This function must only be called in states < Gst::STATE_PAUSED.
*
* @param format The format to use.
*/
void set_format(Format format);
/** Query the source for the latency parameters. @a live will be <tt>true</tt> when @a src is
* configured as a live source. @a min_latency and @a max_latency will be set
* to the difference between the running time and the timestamp of the first
* buffer.
*
* This function is mostly used by subclasses.
*
* @param live If the source is live.
* @param min_latency The min latency of the source.
* @param max_latency The max latency of the source.
* @return <tt>true</tt> if the query succeeded.
*/
bool query_latency(bool& live, Gst::ClockTime& min_latency, Gst::ClockTime& max_latency) const;
/** Get the number of bytes that @a src will push out with each buffer.
*
* @return The number of bytes pushed with each buffer.
*/
guint get_blocksize() const;
/** Set the number of bytes that @a src will push out with each buffer. When
* @a blocksize is set to -1, a default length will be used.
*
* @param blocksize The new blocksize in bytes.
*/
void set_blocksize(guint blocksize);
/** Query if @a src timestamps outgoing buffers based on the current running_time.
*
* @return <tt>true</tt> if the base class will automatically timestamp outgoing buffers.
*/
bool get_do_timestamp() const;
/** Configure @a src to automatically timestamp outgoing buffers based on the
* current running_time of the pipeline. This property is mostly useful for live
* sources.
*
* @param timestamp Enable or disable timestamping.
*/
void set_do_timestamp(bool timestamp);
/** Prepare a new seamless segment for emission downstream. This function must
* only be called by derived sub-classes, and only from the create() function,
* as the stream-lock needs to be held.
*
* The format for the new segment will be the current format of the source, as
* configured with set_format()
*
* @param start The new start value for the segment.
* @param stop Stop value for the new segment.
* @param position The new time value for the start of the new segment.
* @return <tt>true</tt> if preparation of the seamless segment succeeded.
*/
bool new_seamless_segment(gint64 start, gint64 stop, gint64 position);
/** Set new caps on the basesrc source pad.
*
* @param caps A Gst::Caps.
* @return <tt>true</tt> if the caps could be set.
*/
bool set_caps(const Glib::RefPtr<Gst::Caps>& caps);
/** Wait until the start operation completes.
*
* @return A Gst::FlowReturn.
*/
Gst::FlowReturn start_wait();
/** If not @a dynamic_size, size is only updated when needed, such as when trying to
* read past current tracked size. Otherwise, size is checked for upon each
* read.
*
* @param dynamic_size New dynamic size mode.
*/
void set_dynamic_size(bool dynamic_size);
/** Configure async behaviour in @a src, no state change will block. The open,
* close, start, stop, play and pause virtual methods will be executed in a
* different thread and are thus allowed to perform blocking operations. Any
* blocking operation should be unblocked with the unlock vmethod.
*
* @param async New async mode.
*/
void set_async(bool async);
/** Get the current async behaviour of @a src. See also set_async().
*
* @return <tt>true</tt> if @a src is operating in async mode.
*/
bool is_async() const;
/** Complete an asynchronous start operation. When the subclass overrides the
* start method, it should call start_complete() when the start
* operation completes either from the same thread or from an asynchronous
* helper thread.
*
* @param ret A Gst::FlowReturn.
*/
void start_complete(Gst::FlowReturn ret);
/** If @a automatic_eos is <tt>true</tt>, @a src will automatically go EOS if a buffer
* after the total size is returned. By default this is <tt>true</tt> but sources
* that can't return an authoritative size and only know that they're EOS
* when trying to read more should set this to <tt>false</tt>.
*
* @param automatic_eos Automatic eos.
*/
void set_automatic_eos(bool automatic_eos);
/** Returns the memory @a allocator used by the base class and its @a params.
*
* @param params The Gst::AllocationParams of @a allocator.
* @return The Gst::Allocator used.
*/
Glib::RefPtr<Gst::Allocator> get_allocator(Gst::AllocationParams& params);
/** Gets the source Gst::Pad object of the element.
*/
Glib::RefPtr<Gst::Pad> get_src_pad();
Glib::RefPtr<const Gst::Pad> get_src_pad() const;
/** Size in bytes to read per buffer (-1 = default).
*
* @return A PropertyProxy that allows you to get or set the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy< gulong > property_blocksize() ;
/** Size in bytes to read per buffer (-1 = default).
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< gulong > property_blocksize() const;
/** Apply current stream time to buffers.
*
* @return A PropertyProxy that allows you to get or set the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy< bool > property_do_timestamp() ;
/** Apply current stream time to buffers.
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< bool > property_do_timestamp() const;
/** Number of buffers to output before sending EOS (-1 = unlimited).
*
* @return A PropertyProxy that allows you to get or set the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy< int > property_num_buffers() ;
/** Number of buffers to output before sending EOS (-1 = unlimited).
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< int > property_num_buffers() const;
/** Run typefind before negotiating.
*
* @return A PropertyProxy that allows you to get or set the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy< bool > property_typefind() ;
/** Run typefind before negotiating.
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< bool > property_typefind() const;
/** Called to get the caps to report.
*/
virtual Glib::RefPtr<Gst::Caps> get_caps_vfunc(const Glib::RefPtr<Gst::Caps>& caps) const;
/** Notify subclass of changed output caps.
*/
virtual bool set_caps_vfunc(const Glib::RefPtr<Gst::Caps>& caps);
/** Negotiated the caps with the peer.
*/
virtual bool negotiate_vfunc();
/** Stop processing. Subclasses should use this to close resources.
*/
virtual bool stop_vfunc();
/** Start processing. Subclasses should open resources and prepare to produce
* data.
*/
virtual bool start_vfunc();
/** Given a buffer, return the start and stop time when it should be pushed
* out. The base class will sync on the clock using these times.
*/
virtual void get_times_vfunc(const Glib::RefPtr<Gst::Buffer>& buffer, Gst::ClockTime& start, Gst::ClockTime& end) const;
/** Return the total size of the resource, in the configured format.
*/
virtual bool get_size_vfunc(guint64& size) const;
/** Check if the source can seek.
*/
virtual bool is_seekable_vfunc() const;
/** Unlock any pending access to the resource. Subclasses should unblock any
* blocked function ASAP.
*/
virtual bool unlock_vfunc();
/** Override this to implement custom event handling.
*/
virtual bool event_vfunc(const Glib::RefPtr<Gst::Event>& event);
virtual FlowReturn create_vfunc(guint64 offset, guint size, Glib::RefPtr<Gst::Buffer>& buffer);
/** Perform seeking on the resource to the indicated segment.
*/
virtual bool do_seek_vfunc(Gst::Segment& segment);
// Cannot use query_vfunc because the name has been used in the Gst::Element class.
// We have to provide custom implementation, because query vfunc expects writable
// query object.
/** Handle a requested query.
*/
virtual bool base_src_query_vfunc(const Glib::RefPtr<Gst::Query>& query);
/** Called during negotiation if caps need fixating. Implement instead of
* setting a fixate function on the source pad.
*/
virtual Glib::RefPtr<Gst::Caps> fixate_vfunc(const Glib::RefPtr<Gst::Caps>& caps);
/** Clear the previous unlock request. Subclasses should clear any state they
* set during unlock_vfunc(), such as clearing command queues.
*/
virtual bool unlock_stop_vfunc();
/** Prepare the Gst::Segment that will be passed to the do_seek_vfunc()
* vmethod for executing a seek request. Sub-classes should override this if
* they support seeking in formats other than the configured native format.
* By default, it tries to convert the seek arguments to the configured
* native format and prepare a segment in that format.
*/
virtual bool prepare_seek_segment_vfunc(const Glib::RefPtr<Gst::Event>& seek, Gst::Segment& segment);
/** Configure the allocation query.
*/
virtual bool decide_allocation_vfunc(const Glib::RefPtr<Gst::Query>& query);
/** Ask the subclass to allocate a buffer with for offset and size. The default
* implementation will create a new buffer from the negotiated allocator.
*/
Gst::FlowReturn alloc_vfunc(guint64 offset, guint size, Glib::RefPtr<Gst::Buffer>& buffer);
/** Ask the subclass to fill the buffer with data for offset and size. The passed
* buffer is guaranteed to hold the requested amount of bytes.
*/
virtual Gst::FlowReturn fill_vfunc(guint64 offset, guint size, const Glib::RefPtr<Gst::Buffer>& buffer);
protected:
public:
public:
//C++ methods used to invoke GTK+ virtual functions:
protected:
//GTK+ Virtual Functions (override these to change behaviour):
//Default Signal Handlers::
};
} //namespace Gst
namespace Glib
{
/** A Glib::wrap() method for this object.
*
* @param object The C instance.
* @param take_copy False if the result should take ownership of the C instance. True if it should take a new copy or ref.
* @result A C++ instance that wraps this C instance.
*
* @relates Gst::BaseSrc
*/
Glib::RefPtr<Gst::BaseSrc> wrap(GstBaseSrc* object, bool take_copy = false);
}
#endif /* _GSTREAMERMM_BASESRC_H */
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