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4dff7c81d6
Seekability, like duration, etc is unlikely to change (frequently), and the default assumption covers most cases, so let subclass set when needed. At the same time, allow subclass to indicate if it has seek-metadata (table) available, and possibly have it provide an average bitrate.
310 lines
11 KiB
C
310 lines
11 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_SEGMENT:
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* @obj: base parse instance
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*
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* Gives the segment 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_SEGMENT(obj) (GST_BASE_PARSE_CAST (obj)->segment)
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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, or from pre_push_buffer to
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* to forego pushing buffer.
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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_FLOW_CLIP:
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*
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* A #GstFlowReturn that can be returned from pre_push_buffer to
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* indicate that regular segment clipping should be performed.
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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_CLIP GST_FLOW_CUSTOM_SUCCESS_1
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/**
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* GST_BASE_PARSE_BUFFER_FLAG_NO_FRAME:
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*
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* A #GstBufferFlag that can be set to have this buffer not counted as frame,
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* e.g. if this frame is dependent on a previous one. As it is not counted as
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* a frame, bitrate increases but frame to time conversions are maintained.
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*
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* Since: 0.10.x
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*/
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#define GST_BASE_PARSE_BUFFER_FLAG_NO_FRAME GST_BUFFER_FLAG_LAST
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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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/**
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* GstBaseParseSeekable:
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* @GST_BASE_PARSE_SEEK_NONE: No seeking possible.
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* GST_BASE_PARSE_SEEK_DEFAULT: Default seeking possible using estimated bitrate.
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* GST_BASE_PARSE_SEEK_TABLE: Additional metadata provides more accurate seeking.
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*
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* Indicates what level (of quality) of seeking is possible.
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*/
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typedef enum _GstBaseParseSeekable {
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GST_BASE_PARSE_SEEK_NONE,
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GST_BASE_PARSE_SEEK_DEFAULT,
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GST_BASE_PARSE_SEEK_TABLE
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} GstBaseParseSeekable;
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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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/**
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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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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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*
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* @get_frame_overhead: Finds the metadata overhead for the given frame. This
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* is used to enable more accurate bitrate computations.
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* If NULL, the per-frame overhead is assumed to be 0. If
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* this returns -1, it is assumed that this frame should
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* be skipped in bitrate calculation.
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*
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* @pre_push_buffer: Optional.
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* Called just prior to pushing a frame (after any pending
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* events have been sent) to give subclass a chance to perform
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* additional actions at this time (e.g. tag sending) or to
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* decide whether this buffer should be dropped or no
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* (e.g. custom segment clipping).
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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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gint (*get_frame_overhead) (GstBaseParse *parse,
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GstBuffer *buf);
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GstFlowReturn (*pre_push_buffer) (GstBaseParse *parse,
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GstBuffer *buf);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE];
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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_seek (GstBaseParse * parse,
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GstBaseParseSeekable seek, guint bitrate);
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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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void gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough);
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void gst_base_parse_set_frame_props (GstBaseParse * parse, guint fps_num,
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guint fps_den, gint interval);
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gboolean gst_base_parse_get_sync (GstBaseParse * parse);
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gboolean gst_base_parse_get_drain (GstBaseParse * parse);
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gboolean gst_base_parse_convert_default (GstBaseParse * parse,
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GstFormat src_format, gint64 src_value,
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GstFormat dest_format, gint64 * dest_value);
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G_END_DECLS
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#endif /* __GST_BASE_PARSE_H__ */
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