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64493d9603
API: GstBaseParseClass::detect() This is called with the first buffers until the subclass has finished detection and only afterwards the original buffers are handled as before. The vfunc allows detection of the stream format without breaking the upstream framing.
330 lines
13 KiB
C
330 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_buffer 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_buffer 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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* Since: 0.10.36
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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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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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