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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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8085352fb3
Allows subclasses to do custom caps query replies. Also exposes the standard caps query handler so subclasses can just extend on top of it instead of reimplementing the caps query proxying. https://bugzilla.gnome.org/show_bug.cgi?id=741263
417 lines
16 KiB
C
417 lines
16 KiB
C
/* GStreamer
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* Copyright (C) 2008 David Schleef <ds@schleef.org>
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* Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>.
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* Copyright (C) 2011 Nokia Corporation. All rights reserved.
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* Contact: Stefan Kost <stefan.kost@nokia.com>
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* Copyright (C) 2012 Collabora Ltd.
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* Author : Edward Hervey <edward@collabora.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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _GST_VIDEO_DECODER_H_
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#define _GST_VIDEO_DECODER_H_
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#include <gst/base/gstadapter.h>
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#include <gst/video/gstvideoutils.h>
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G_BEGIN_DECLS
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#define GST_TYPE_VIDEO_DECODER \
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(gst_video_decoder_get_type())
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#define GST_VIDEO_DECODER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_DECODER,GstVideoDecoder))
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#define GST_VIDEO_DECODER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_DECODER,GstVideoDecoderClass))
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#define GST_VIDEO_DECODER_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_VIDEO_DECODER,GstVideoDecoderClass))
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#define GST_IS_VIDEO_DECODER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_DECODER))
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#define GST_IS_VIDEO_DECODER_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_DECODER))
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#define GST_VIDEO_DECODER_CAST(obj) ((GstVideoDecoder *)(obj))
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/**
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* GST_VIDEO_DECODER_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_VIDEO_DECODER_SINK_NAME "sink"
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/**
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* GST_VIDEO_DECODER_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_VIDEO_DECODER_SRC_NAME "src"
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/**
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* GST_VIDEO_DECODER_SRC_PAD:
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* @obj: a #GstVideoDecoder
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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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#define GST_VIDEO_DECODER_SRC_PAD(obj) (((GstVideoDecoder *) (obj))->srcpad)
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/**
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* GST_VIDEO_DECODER_SINK_PAD:
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* @obj: a #GstVideoDecoder
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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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#define GST_VIDEO_DECODER_SINK_PAD(obj) (((GstVideoDecoder *) (obj))->sinkpad)
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/**
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* GST_VIDEO_DECODER_FLOW_NEED_DATA:
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*
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* Returned while parsing to indicate more data is needed.
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**/
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#define GST_VIDEO_DECODER_FLOW_NEED_DATA GST_FLOW_CUSTOM_SUCCESS
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/**
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* GST_VIDEO_DECODER_INPUT_SEGMENT:
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* @obj: base decoder instance
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*
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* Gives the segment of the element.
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*/
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#define GST_VIDEO_DECODER_INPUT_SEGMENT(obj) (GST_VIDEO_DECODER_CAST (obj)->input_segment)
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/**
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* GST_VIDEO_DECODER_OUTPUT_SEGMENT:
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* @obj: base decoder instance
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*
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* Gives the segment of the element.
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*/
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#define GST_VIDEO_DECODER_OUTPUT_SEGMENT(obj) (GST_VIDEO_DECODER_CAST (obj)->output_segment)
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/**
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* GST_VIDEO_DECODER_STREAM_LOCK:
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* @decoder: video decoder instance
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*
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* Obtain a lock to protect the decoder function from concurrent access.
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*/
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#define GST_VIDEO_DECODER_STREAM_LOCK(decoder) g_rec_mutex_lock (&GST_VIDEO_DECODER (decoder)->stream_lock)
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/**
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* GST_VIDEO_DECODER_STREAM_UNLOCK:
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* @decoder: video decoder instance
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*
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* Release the lock that protects the decoder function from concurrent access.
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*/
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#define GST_VIDEO_DECODER_STREAM_UNLOCK(decoder) g_rec_mutex_unlock (&GST_VIDEO_DECODER (decoder)->stream_lock)
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typedef struct _GstVideoDecoder GstVideoDecoder;
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typedef struct _GstVideoDecoderClass GstVideoDecoderClass;
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typedef struct _GstVideoDecoderPrivate GstVideoDecoderPrivate;
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/* do not use this one, use macro below */
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GstFlowReturn _gst_video_decoder_error (GstVideoDecoder *dec, gint weight,
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GQuark domain, gint code,
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gchar *txt, gchar *debug,
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const gchar *file, const gchar *function,
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gint line);
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/**
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* GST_VIDEO_DECODER_ERROR:
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* @el: the base video decoder element that generates the error
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* @w: element defined weight of the error, added to error count
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* @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
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* @code: error code defined for that domain (see #gstreamer-GstGError)
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* @text: the message to display (format string and args enclosed in
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* parentheses)
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* @debug: debugging information for the message (format string and args
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* enclosed in parentheses)
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* @ret: variable to receive return value
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*
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* Utility function that video decoder elements can use in case they encountered
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* a data processing error that may be fatal for the current "data unit" but
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* need not prevent subsequent decoding. Such errors are counted and if there
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* are too many, as configured in the context's max_errors, the pipeline will
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* post an error message and the application will be requested to stop further
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* media processing. Otherwise, it is considered a "glitch" and only a warning
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* is logged. In either case, @ret is set to the proper value to
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* return to upstream/caller (indicating either GST_FLOW_ERROR or GST_FLOW_OK).
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*/
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#define GST_VIDEO_DECODER_ERROR(el, w, domain, code, text, debug, ret) \
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G_STMT_START { \
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gchar *__txt = _gst_element_error_printf text; \
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gchar *__dbg = _gst_element_error_printf debug; \
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GstVideoDecoder *__dec = GST_VIDEO_DECODER (el); \
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ret = _gst_video_decoder_error (__dec, w, GST_ ## domain ## _ERROR, \
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GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
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GST_FUNCTION, __LINE__); \
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} G_STMT_END
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/**
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* GST_VIDEO_DECODER_MAX_ERRORS:
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*
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* Default maximum number of errors tolerated before signaling error.
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*/
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#define GST_VIDEO_DECODER_MAX_ERRORS 10
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/**
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* GstVideoDecoder:
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*
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* The opaque #GstVideoDecoder data structure.
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*/
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struct _GstVideoDecoder
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{
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/*< private >*/
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GstElement element;
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/*< protected >*/
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GstPad *sinkpad;
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GstPad *srcpad;
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/* protects all data processing, i.e. is locked
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* in the chain function, finish_frame and when
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* processing serialized events */
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GRecMutex stream_lock;
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/* MT-protected (with STREAM_LOCK) */
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GstSegment input_segment;
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GstSegment output_segment;
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GstVideoDecoderPrivate *priv;
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/*< private >*/
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void *padding[GST_PADDING_LARGE];
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};
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/**
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* GstVideoDecoderClass:
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* @open: Optional.
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* Called when the element changes to GST_STATE_READY.
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* Allows opening external resources.
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* @close: Optional.
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* Called when the element changes to GST_STATE_NULL.
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* Allows closing external resources.
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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_format: Notifies subclass of incoming data format (caps).
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* @parse: Required for non-packetized input.
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* Allows chopping incoming data into manageable units (frames)
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* for subsequent decoding.
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* @reset: Optional.
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* Allows subclass (decoder) to perform post-seek semantics reset.
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* Deprecated.
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* @handle_frame: Provides input data frame to subclass.
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* @finish: Optional.
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* Called to request subclass to dispatch any pending remaining
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* data (e.g. at EOS or segment end). Sub-classes should be prepared
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* to handle new data afterward, or seamless segment processing will break.
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* @sink_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 should be discarded
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* (i.e. not unref'ed).
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* Subclasses should chain up to the parent implementation to
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* invoke the default handler.
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* @src_event: Optional.
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* Event handler on the source pad. This function should return
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* TRUE if the event was handled and should be discarded
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* (i.e. not unref'ed).
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* Subclasses should chain up to the parent implementation to
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* invoke the default handler.
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* @negotiate: Optional.
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* Negotiate with downstream and configure buffer pools, etc.
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* Subclasses should chain up to the parent implementation to
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* invoke the default handler.
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* @decide_allocation: Optional.
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* Setup the allocation parameters for allocating output
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* buffers. The passed in query contains the result of the
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* downstream allocation query.
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* Subclasses should chain up to the parent implementation to
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* invoke the default handler.
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* @propose_allocation: Optional.
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* Propose buffer allocation parameters for upstream elements.
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* Subclasses should chain up to the parent implementation to
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* invoke the default handler.
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* @flush: Optional.
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* Flush all remaining data from the decoder without
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* pushing it downstream. Since: 1.2
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* @sink_query: Optional.
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* Query handler on the sink pad. This function should
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* return TRUE if the query could be performed. Subclasses
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* should chain up to the parent implementation to invoke the
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* default handler. Since 1.4
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* @src_query: Optional.
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* Query handler on the source pad. This function should
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* return TRUE if the query could be performed. Subclasses
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* should chain up to the parent implementation to invoke the
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* default handler. Since 1.4
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* @getcaps: Optional.
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* Allows for a custom sink getcaps implementation.
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* If not implemented, default returns
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* gst_video_decoder_proxy_getcaps
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* applied to sink template caps.
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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 @handle_frame needs to be overridden, and @set_format
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* and likely as well. If non-packetized input is supported or expected,
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* @parse needs to be overridden as well.
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*/
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struct _GstVideoDecoderClass
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{
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/*< private >*/
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GstElementClass element_class;
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/*< public >*/
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gboolean (*open) (GstVideoDecoder *decoder);
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gboolean (*close) (GstVideoDecoder *decoder);
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gboolean (*start) (GstVideoDecoder *decoder);
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gboolean (*stop) (GstVideoDecoder *decoder);
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GstFlowReturn (*parse) (GstVideoDecoder *decoder,
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GstVideoCodecFrame *frame,
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GstAdapter *adapter,
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gboolean at_eos);
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gboolean (*set_format) (GstVideoDecoder *decoder,
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GstVideoCodecState * state);
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gboolean (*reset) (GstVideoDecoder *decoder,
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gboolean hard);
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GstFlowReturn (*finish) (GstVideoDecoder *decoder);
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GstFlowReturn (*handle_frame) (GstVideoDecoder *decoder,
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GstVideoCodecFrame *frame);
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gboolean (*sink_event) (GstVideoDecoder *decoder,
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GstEvent *event);
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gboolean (*src_event) (GstVideoDecoder *decoder,
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GstEvent *event);
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gboolean (*negotiate) (GstVideoDecoder *decoder);
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gboolean (*decide_allocation) (GstVideoDecoder *decoder, GstQuery *query);
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gboolean (*propose_allocation) (GstVideoDecoder *decoder, GstQuery * query);
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gboolean (*flush) (GstVideoDecoder *decoder);
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gboolean (*sink_query) (GstVideoDecoder *decoder,
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GstQuery *query);
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gboolean (*src_query) (GstVideoDecoder *decoder,
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GstQuery *query);
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GstCaps* (*getcaps) (GstVideoDecoder *decoder,
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GstCaps *filter);
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/*< private >*/
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void *padding[GST_PADDING_LARGE-4];
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};
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GType gst_video_decoder_get_type (void);
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/* Context parameters */
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void gst_video_decoder_set_packetized (GstVideoDecoder * decoder,
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gboolean packetized);
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gboolean gst_video_decoder_get_packetized (GstVideoDecoder * decoder);
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void gst_video_decoder_set_estimate_rate (GstVideoDecoder * dec,
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gboolean enabled);
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gint gst_video_decoder_get_estimate_rate (GstVideoDecoder * dec);
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void gst_video_decoder_set_max_errors (GstVideoDecoder * dec,
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gint num);
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gint gst_video_decoder_get_max_errors (GstVideoDecoder * dec);
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void gst_video_decoder_set_needs_format (GstVideoDecoder * dec,
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gboolean enabled);
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gboolean gst_video_decoder_get_needs_format (GstVideoDecoder * dec);
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void gst_video_decoder_set_latency (GstVideoDecoder *decoder,
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GstClockTime min_latency,
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GstClockTime max_latency);
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void gst_video_decoder_get_latency (GstVideoDecoder *decoder,
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GstClockTime *min_latency,
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GstClockTime *max_latency);
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void gst_video_decoder_get_allocator (GstVideoDecoder *decoder,
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GstAllocator **allocator,
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GstAllocationParams *params);
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GstBufferPool *gst_video_decoder_get_buffer_pool (GstVideoDecoder *decoder);
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/* Object methods */
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GstVideoCodecFrame *gst_video_decoder_get_frame (GstVideoDecoder *decoder,
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int frame_number);
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GstVideoCodecFrame *gst_video_decoder_get_oldest_frame (GstVideoDecoder *decoder);
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GList * gst_video_decoder_get_frames (GstVideoDecoder *decoder);
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/* Parsing related methods */
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void gst_video_decoder_add_to_frame (GstVideoDecoder *decoder,
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int n_bytes);
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GstFlowReturn gst_video_decoder_have_frame (GstVideoDecoder *decoder);
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gsize gst_video_decoder_get_pending_frame_size (GstVideoDecoder *decoder);
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GstBuffer *gst_video_decoder_allocate_output_buffer (GstVideoDecoder * decoder);
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GstFlowReturn gst_video_decoder_allocate_output_frame (GstVideoDecoder *decoder,
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GstVideoCodecFrame *frame);
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GstVideoCodecState *gst_video_decoder_set_output_state (GstVideoDecoder *decoder,
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GstVideoFormat fmt, guint width, guint height,
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GstVideoCodecState *reference);
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GstVideoCodecState *gst_video_decoder_get_output_state (GstVideoDecoder *decoder);
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gboolean gst_video_decoder_negotiate (GstVideoDecoder * decoder);
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GstClockTimeDiff gst_video_decoder_get_max_decode_time (GstVideoDecoder *decoder,
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GstVideoCodecFrame *frame);
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gdouble gst_video_decoder_get_qos_proportion (GstVideoDecoder * decoder);
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GstFlowReturn gst_video_decoder_finish_frame (GstVideoDecoder *decoder,
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GstVideoCodecFrame *frame);
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GstFlowReturn gst_video_decoder_drop_frame (GstVideoDecoder *dec,
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GstVideoCodecFrame *frame);
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void gst_video_decoder_release_frame (GstVideoDecoder * dec,
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GstVideoCodecFrame * frame);
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void gst_video_decoder_merge_tags (GstVideoDecoder *decoder,
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const GstTagList *tags,
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GstTagMergeMode mode);
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GstCaps * gst_video_decoder_proxy_getcaps (GstVideoDecoder * decoder,
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GstCaps * caps,
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GstCaps * filter);
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G_END_DECLS
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#endif
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