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a8decde6d3
Some decoding APIs support delayed output for performance reasons. One example would be to request decoding for multiple frames and then query for the oldest frame in the output queue. This also increases throughput for transcoding and improves seek performance when supported by the underlying backend. Introduce support in the mpeg2 base class, so that backends that support render delays can actually implement it. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1013>
207 lines
7 KiB
C
207 lines
7 KiB
C
/* GStreamer
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* Copyright (C) 2020 Intel Corporation
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* Author: He Junyan <junyan.he@intel.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_MPEG2_DECODER_H__
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#define __GST_MPEG2_DECODER_H__
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#include <gst/codecs/codecs-prelude.h>
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#include <gst/video/video.h>
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#include <gst/codecparsers/gstmpegvideoparser.h>
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#include <gst/codecs/gstmpeg2picture.h>
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G_BEGIN_DECLS
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#define GST_TYPE_MPEG2_DECODER (gst_mpeg2_decoder_get_type())
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#define GST_MPEG2_DECODER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MPEG2_DECODER,GstMpeg2Decoder))
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#define GST_MPEG2_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MPEG2_DECODER,GstMpeg2DecoderClass))
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#define GST_MPEG2_DECODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_MPEG2_DECODER,GstMpeg2DecoderClass))
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#define GST_IS_MPEG2_DECODER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MPEG2_DECODER))
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#define GST_IS_MPEG2_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MPEG2_DECODER))
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typedef struct _GstMpeg2Decoder GstMpeg2Decoder;
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typedef struct _GstMpeg2DecoderClass GstMpeg2DecoderClass;
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typedef struct _GstMpeg2DecoderPrivate GstMpeg2DecoderPrivate;
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/**
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* GstMpeg2Decoder:
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*
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* The opaque #GstMpeg2Decoder data structure.
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*
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* Since: 1.20
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*/
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struct _GstMpeg2Decoder
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{
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/*< private >*/
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GstVideoDecoder parent;
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/*< protected >*/
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GstVideoCodecState * input_state;
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/*< private >*/
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GstMpeg2DecoderPrivate *priv;
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gpointer padding[GST_PADDING_LARGE];
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};
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/**
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* GstMpeg2DecoderClass:
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*/
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struct _GstMpeg2DecoderClass
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{
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GstVideoDecoderClass parent_class;
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/**
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* GstMpeg2DecoderClass::new_sequence:
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* @decoder: a #GstMpeg2Decoder
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* @seq: a #GstMpegVideoSequenceHdr
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* @seq_ext: a #GstMpegVideoSequenceExt
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*
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* Notifies subclass of SPS update
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*
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* Since: 1.20
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*/
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GstFlowReturn (*new_sequence) (GstMpeg2Decoder * decoder,
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const GstMpegVideoSequenceHdr * seq,
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const GstMpegVideoSequenceExt * seq_ext,
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const GstMpegVideoSequenceDisplayExt * seq_display_ext,
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const GstMpegVideoSequenceScalableExt * seq_scalable_ext);
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/**
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* GstMpeg2DecoderClass::new_picture:
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* @decoder: a #GstMpeg2Decoder
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* @frame: (transfer none): a #GstVideoCodecFrame
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* @picture: (transfer none): a #GstMpeg2Picture
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*
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* Optional. Called whenever new #GstMpeg2Picture is created.
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* Subclass can set implementation specific user data
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* on the #GstMpeg2Picture via gst_mpeg2_picture_set_user_data()
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*
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* Since: 1.20
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*/
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GstFlowReturn (*new_picture) (GstMpeg2Decoder * decoder,
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GstVideoCodecFrame * frame,
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GstMpeg2Picture * picture);
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/**
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* GstMpeg2DecoderClass::new_field_picture:
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* @decoder: a #GstMpeg2Decoder
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* @first_field: (transfer none): the first field #GstMpeg2Picture already decoded
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* @second_field: (transfer none): a #GstMpeg2Picture for the second field
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*
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* Called when a new field picture is created for interlaced field picture.
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* Subclass can attach implementation specific user data on @second_field via
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* gst_mpeg2_picture_set_user_data()
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*
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* Since: 1.20
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*/
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GstFlowReturn (*new_field_picture) (GstMpeg2Decoder * decoder,
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const GstMpeg2Picture * first_field,
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GstMpeg2Picture * second_field);
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/**
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* GstMpeg2DecoderClass::start_picture:
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* @decoder: a #GstMpeg2Decoder
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* @picture: (transfer none): a #GstMpeg2Picture
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* @slice: (transfer none): a #GstMpeg2Slice
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* @prev_picture: (transfer none): a #GstMpeg2Picture
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* @next_picture: (transfer none): a #GstMpeg2Picture
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*
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* Optional. Called per one #GstMpeg2Picture to notify subclass to prepare
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* decoding process for the #GstMpeg2Picture
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*
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* Since: 1.20
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*/
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GstFlowReturn (*start_picture) (GstMpeg2Decoder * decoder,
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GstMpeg2Picture * picture,
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GstMpeg2Slice * slice,
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GstMpeg2Picture * prev_picture,
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GstMpeg2Picture * next_picture);
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/**
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* GstMpeg2DecoderClass::decode_slice:
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* @decoder: a #GstMpeg2Decoder
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* @picture: (transfer none): a #GstMpeg2Picture
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* @slice: (transfer none): a #GstMpeg2Slice
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*
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* Provides per slice data with parsed slice header and required raw bitstream
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* for subclass to decode it.
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*
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* Since: 1.20
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*/
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GstFlowReturn (*decode_slice) (GstMpeg2Decoder * decoder,
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GstMpeg2Picture * picture,
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GstMpeg2Slice * slice);
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/**
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* GstMpeg2DecoderClass::end_picture:
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* @decoder: a #GstMpeg2Decoder
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* @picture: (transfer none): a #GstMpeg2Picture
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*
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* Optional. Called per one #GstMpeg2Picture to notify subclass to finish
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* decoding process for the #GstMpeg2Picture
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*
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* Since: 1.20
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*/
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GstFlowReturn (*end_picture) (GstMpeg2Decoder * decoder,
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GstMpeg2Picture * picture);
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/**
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* GstMpeg2DecoderClass::output_picture:
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* @decoder: a #GstMpeg2Decoder
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* @frame: (transfer full): a #GstVideoCodecFrame
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* @picture: (transfer full): a #GstMpeg2Picture
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*
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* Called with a #GstMpeg2Picture which is required to be outputted.
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* The #GstVideoCodecFrame must be consumed by subclass.
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*
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* Since: 1.20
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*/
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GstFlowReturn (*output_picture) (GstMpeg2Decoder * decoder,
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GstVideoCodecFrame * frame,
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GstMpeg2Picture * picture);
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/**
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* GstMpeg2DecoderClass::get_preferred_output_delay:
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* @decoder: a #GstMpeg2Decoder
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* @is_live: whether upstream is live or not
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*
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* Optional. Called by baseclass to query whether delaying output is
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* preferred by subclass or not.
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*
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* Returns: the number of perferred delayed output frames
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*
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* Since: 1.20
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*/
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guint (*get_preferred_output_delay) (GstMpeg2Decoder * decoder,
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gboolean is_live);
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/*< private >*/
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gpointer padding[GST_PADDING_LARGE];
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};
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMpeg2Decoder, gst_object_unref)
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GST_CODECS_API
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GType gst_mpeg2_decoder_get_type (void);
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G_END_DECLS
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#endif /* __GST_MPEG2_DECODER_H__ */
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