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bd50c29658
Also handle the case gracefully where the subclass decides to drop the first buffers and has no caps set yet. It's still required to have valid caps set when the first buffer should be passed downstream.
241 lines
8.1 KiB
C
241 lines
8.1 KiB
C
/* GStreamer
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* Copyright (C) 2008 Nokia Corporation. All rights reserved.
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*
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* Contact: Stefan Kost <stefan.kost@nokia.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_BASE_PARSE_H__
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#define __GST_BASE_PARSE_H__
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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G_BEGIN_DECLS
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#define GST_TYPE_BASE_PARSE (gst_base_parse_get_type())
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#define GST_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_PARSE,GstBaseParse))
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#define GST_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_PARSE,GstBaseParseClass))
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#define GST_BASE_PARSE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_PARSE,GstBaseParseClass))
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#define GST_IS_BASE_PARSE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_PARSE))
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#define GST_IS_BASE_PARSE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_PARSE))
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#define GST_BASE_PARSE_CAST(obj) ((GstBaseParse *)(obj))
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/**
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* GST_BASE_PARSE_SINK_NAME:
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*
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* the name of the templates for the sink pad
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*/
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#define GST_BASE_PARSE_SINK_NAME "sink"
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/**
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* GST_BASE_PARSE_SRC_NAME:
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*
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* the name of the templates for the source pad
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*/
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#define GST_BASE_PARSE_SRC_NAME "src"
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/**
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* GST_BASE_PARSE_SRC_PAD:
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* @obj: base parse instance
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*
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* Gives the pointer to the source #GstPad object of the element.
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*
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* Since: 0.10.x
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*/
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#define GST_BASE_PARSE_SRC_PAD(obj) (GST_BASE_PARSE_CAST (obj)->srcpad)
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/**
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* GST_BASE_PARSE_SINK_PAD:
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* @obj: base parse instance
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*
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* Gives the pointer to the sink #GstPad object of the element.
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*
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* Since: 0.10.x
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*/
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#define GST_BASE_PARSE_SINK_PAD(obj) (GST_BASE_PARSE_CAST (obj)->sinkpad)
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/**
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* GST_BASE_PARSE_FLOW_DROPPED:
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*
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* A #GstFlowReturn that can be returned from parse_frame to
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* indicate that no output buffer was generated.
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*
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* Since: 0.10.x
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*/
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#define GST_BASE_PARSE_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS
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/**
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* GST_BASE_PARSE_LOCK:
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* @obj: base parse instance
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*
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* Obtain a lock to protect the parse function from concurrent access.
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*
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* Since: 0.10.x
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*/
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#define GST_BASE_PARSE_LOCK(obj) g_mutex_lock (GST_BASE_PARSE_CAST (obj)->parse_lock)
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/**
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* GST_BASE_PARSE_UNLOCK:
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* @obj: base parse instance
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*
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* Release the lock that protects the parse function from concurrent access.
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*
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* Since: 0.10.x
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*/
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#define GST_BASE_PARSE_UNLOCK(obj) g_mutex_unlock (GST_BASE_PARSE_CAST (obj)->parse_lock)
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typedef struct _GstBaseParse GstBaseParse;
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typedef struct _GstBaseParseClass GstBaseParseClass;
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typedef struct _GstBaseParsePrivate GstBaseParsePrivate;
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typedef struct _GstBaseParseClassPrivate GstBaseParseClassPrivate;
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/**
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* GstBaseParse:
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* @element: the parent element.
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*
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* The opaque #GstBaseParse data structure.
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*/
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struct _GstBaseParse {
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GstElement element;
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GstAdapter *adapter;
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/*< protected >*/
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/* source and sink pads */
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GstPad *sinkpad;
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GstPad *srcpad;
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/* MT-protected (with STREAM_LOCK) */
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GstSegment segment;
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/* Newsegment event to be sent after SEEK */
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GstEvent *pending_segment;
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/* Segment event that closes the running segment prior to SEEK */
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GstEvent *close_segment;
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/* Caps nego done already? */
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gboolean negotiated;
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GMutex *parse_lock;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE];
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GstBaseParsePrivate *priv;
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};
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/**
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* GstBaseParseClass:
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* @start: Optional.
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* Called when the element starts processing.
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* Allows opening external resources.
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* @stop: Optional.
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* Called when the element stops processing.
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* Allows closing external resources.
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* @set_sink_caps: allows the subclass to be notified of the actual caps set.
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* @check_valid_frame: Check if the given piece of data contains a valid
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* frame.
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* @parse_frame: Parse the already checked frame. Subclass need to
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* set the buffer timestamp, duration, caps and possibly
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* other necessary metadata. This is called with srcpad's
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* STREAM_LOCK held.
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* @convert: Optional.
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* Convert between formats.
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* @find_frame: Optional.
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* Finds a frame. Gets a position passed and should return
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* TRUE and the offset in bytes where this position is.
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* Will only be called in pull mode and the subclass can pull
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* whatever it wants from upstream. If not implemented,
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* the base class will implement it by calling
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* @check_valid_frame and @parse_frame to find the wanted
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* frame and build a seek table.
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* @event: Optional.
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* Event handler on the sink pad. This function should return
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* TRUE if the event was handled and can be dropped.
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* @src_event: Optional.
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* Event handler on the source pad. Should return TRUE
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* if the event was handled and can be dropped.
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* @is_seekable: Optional.
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* Subclass can override this if it wants to control the
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* seekability of the stream. Otherwise the element assumes
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* that stream is always seekable.
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*
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* Subclasses can override any of the available virtual methods or not, as
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* needed. At minimum @check_valid_frame and @parse_frame needs to be
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* overridden.
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*/
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struct _GstBaseParseClass {
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GstElementClass parent_class;
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/*< public >*/
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/* virtual methods for subclasses */
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gboolean (*start) (GstBaseParse *parse);
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gboolean (*stop) (GstBaseParse *parse);
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gboolean (*set_sink_caps) (GstBaseParse *parse,
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GstCaps *caps);
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gboolean (*check_valid_frame) (GstBaseParse *parse,
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GstBuffer *buffer,
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guint *framesize,
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gint *skipsize);
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GstFlowReturn (*parse_frame) (GstBaseParse *parse,
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GstBuffer *buffer);
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gboolean (*convert) (GstBaseParse * parse,
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GstFormat src_format,
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gint64 src_value,
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GstFormat dest_format,
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gint64 * dest_value);
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gboolean (*find_frame) (GstBaseParse *parse,
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GstFormat src_format,
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gint64 src_value,
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gint64 * dest_value);
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gboolean (*event) (GstBaseParse *parse,
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GstEvent *event);
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gboolean (*src_event) (GstBaseParse *parse,
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GstEvent *event);
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gboolean (*is_seekable) (GstBaseParse *parse);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE];
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GstBaseParseClassPrivate *priv;
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};
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GType gst_base_parse_get_type (void);
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GstFlowReturn gst_base_parse_push_buffer (GstBaseParse *parse,
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GstBuffer *buffer);
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void gst_base_parse_set_duration (GstBaseParse *parse,
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GstFormat fmt,
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gint64 duration);
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void gst_base_parse_set_min_frame_size (GstBaseParse *parse,
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guint min_size);
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G_END_DECLS
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#endif /* __GST_BASE_PARSE_H__ */
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