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329 lines
13 KiB
C
329 lines
13 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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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_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: 0.10.33
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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: 0.10.33
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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, or from pre_push_frame to
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* to forego pushing buffer.
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*
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* Since: 0.10.33
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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_QUEUED:
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*
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* A #GstFlowReturn that can be returned from parse frame to indicate that
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* the buffer will be queued to be pushed when the next OK
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*
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* Since: 0.10.33
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*/
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#define GST_BASE_PARSE_FLOW_QUEUED GST_FLOW_CUSTOM_SUCCESS_1
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/* not public API, use accessor macros below */
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#define GST_BASE_PARSE_FLAG_LOST_SYNC (1 << 0)
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#define GST_BASE_PARSE_FLAG_DRAINING (1 << 1)
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/**
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* GST_BASE_PARSE_LOST_SYNC:
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* @parse: base parse instance
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*
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* Obtains current sync status.
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*
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* Since: 0.10.33
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*/
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#define GST_BASE_PARSE_LOST_SYNC(parse) (!!(GST_BASE_PARSE_CAST(parse)->flags & GST_BASE_PARSE_FLAG_LOST_SYNC))
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/**
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* GST_BASE_PARSE_DRAINING:
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* @parse: base parse instance
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*
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* Obtains current drain status (ie. whether EOS has been received and
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* the parser is now processing the frames at the end of the stream)
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*
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* Since: 0.10.33
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*/
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#define GST_BASE_PARSE_DRAINING(parse) (!!(GST_BASE_PARSE_CAST(parse)->flags & GST_BASE_PARSE_FLAG_DRAINING))
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/**
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* GstBaseParseFrameFlags:
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* @GST_BASE_PARSE_FRAME_FLAG_NONE: no flag
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* @GST_BASE_PARSE_FRAME_FLAG_NO_FRAME: set to indicate this buffer should not be
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* counted as frame, e.g. if this frame is dependent on a previous one.
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* As it is not counted as a frame, bitrate increases but frame to time
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* conversions are maintained.
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* @GST_BASE_PARSE_FRAME_FLAG_CLIP: @pre_push_frame can set this to indicate
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* that regular segment clipping can still be performed (as opposed to
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* any custom one having been done).
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*
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* Flags to be used in a #GstBaseParseFrame.
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*
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* Since: 0.10.33
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*/
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typedef enum {
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GST_BASE_PARSE_FRAME_FLAG_NONE = 0,
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GST_BASE_PARSE_FRAME_FLAG_NO_FRAME = (1 << 0),
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GST_BASE_PARSE_FRAME_FLAG_CLIP = (1 << 1)
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} GstBaseParseFrameFlags;
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/**
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* GstBaseParseFrame:
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* @buffer: data to check for valid frame or parsed frame.
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* Subclass is allowed to replace this buffer.
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* @overhead: subclass can set this to indicates the metadata overhead
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* for the given frame, which is then used to enable more accurate bitrate
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* computations. If this is -1, it is assumed that this frame should be
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* skipped in bitrate calculation.
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* @flags: a combination of input and output #GstBaseParseFrameFlags that
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* convey additional context to subclass or allow subclass to tune
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* subsequent #GstBaseParse actions.
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*
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* Frame (context) data passed to each frame parsing virtual methods. In
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* addition to providing the data to be checked for a valid frame or an already
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* identified frame, it conveys additional metadata or control information
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* from and to the subclass w.r.t. the particular frame in question (rather
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* than global parameters). Some of these may apply to each parsing stage, others
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* only to some a particular one. These parameters are effectively zeroed at start
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* of each frame's processing, i.e. parsing virtual method invocation sequence.
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*
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* Since: 0.10.33
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*/
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typedef struct {
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GstBuffer * buffer;
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guint flags;
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gint overhead;
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/*< private >*/
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guint _gst_reserved_i[2];
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gpointer _gst_reserved_p[2];
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guint _private_flags;
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} GstBaseParseFrame;
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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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/*< 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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guint flags;
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/* MT-protected (with STREAM_LOCK) */
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GstSegment segment;
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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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* @parent_class: the parent class
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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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* @get_sink_caps: allows the subclass to do its own sink get caps if needed.
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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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* @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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* @pre_push_frame: 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 not
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* (e.g. custom segment clipping).
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* @detect: Optional.
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* Called until it doesn't return GST_FLOW_OK anymore for
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* the first buffers. Can be used by the subclass to detect
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* the stream format. Since: 0.10.36
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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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GstBaseParseFrame * frame,
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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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GstBaseParseFrame * frame);
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GstFlowReturn (*pre_push_frame) (GstBaseParse * parse,
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GstBaseParseFrame * frame);
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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 (*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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GstCaps * (*get_sink_caps) (GstBaseParse * parse,
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GstCaps * filter);
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GstFlowReturn (*detect) (GstBaseParse * parse,
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GstBuffer * buffer);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE - 2];
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};
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GType gst_base_parse_get_type (void);
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GType gst_base_parse_frame_get_type (void);
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GstBaseParseFrame * gst_base_parse_frame_new (GstBuffer * buffer,
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GstBaseParseFrameFlags flags,
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gint overhead);
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void gst_base_parse_frame_init (GstBaseParseFrame * frame);
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void gst_base_parse_frame_free (GstBaseParseFrame * frame);
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GstFlowReturn gst_base_parse_push_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame);
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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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gint interval);
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void gst_base_parse_set_average_bitrate (GstBaseParse * parse,
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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_has_timing_info (GstBaseParse * parse,
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gboolean has_timing);
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void gst_base_parse_set_syncable (GstBaseParse * parse,
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gboolean syncable);
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void gst_base_parse_set_passthrough (GstBaseParse * parse,
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gboolean passthrough);
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void gst_base_parse_set_frame_rate (GstBaseParse * parse,
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guint fps_num,
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guint fps_den,
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guint lead_in,
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guint lead_out);
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void gst_base_parse_set_latency (GstBaseParse * parse,
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GstClockTime min_latency,
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GstClockTime max_latency);
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gboolean gst_base_parse_convert_default (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 gst_base_parse_add_index_entry (GstBaseParse * parse,
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guint64 offset,
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GstClockTime ts,
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gboolean key,
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gboolean force);
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G_END_DECLS
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#endif /* __GST_BASE_PARSE_H__ */
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