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86e312c1b1
Some decoding APIs support delayed output or a command for decoding a frame doesn't need to be sequential to corresponding command for getting decoded frame. For instance, subclass might be able to request decoding for multiple frames and then get for one (oldest) decoded frame or so. If aforementioned case is supported by specific decoding API, delayed output might show better throughput performance. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1925>
212 lines
7.7 KiB
C
212 lines
7.7 KiB
C
/* GStreamer
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* Copyright (C) 2019 Seungha Yang <seungha.yang@navercorp.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_H264_DECODER_H__
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#define __GST_H264_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/gsth264parser.h>
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#include <gst/codecs/gsth264picture.h>
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G_BEGIN_DECLS
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#define GST_TYPE_H264_DECODER (gst_h264_decoder_get_type())
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#define GST_H264_DECODER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_H264_DECODER,GstH264Decoder))
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#define GST_H264_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_H264_DECODER,GstH264DecoderClass))
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#define GST_H264_DECODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_H264_DECODER,GstH264DecoderClass))
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#define GST_IS_H264_DECODER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_H264_DECODER))
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#define GST_IS_H264_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_H264_DECODER))
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#define GST_H264_DECODER_CAST(obj) ((GstH264Decoder*)obj)
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typedef struct _GstH264Decoder GstH264Decoder;
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typedef struct _GstH264DecoderClass GstH264DecoderClass;
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typedef struct _GstH264DecoderPrivate GstH264DecoderPrivate;
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/**
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* GstH264Decoder:
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*
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* The opaque #GstH264Decoder data structure.
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*/
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struct _GstH264Decoder
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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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GstH264DecoderPrivate *priv;
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gpointer padding[GST_PADDING_LARGE];
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};
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/**
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* GstH264DecoderClass:
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*
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* The opaque #GstH264DecoderClass data structure.
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*/
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struct _GstH264DecoderClass
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{
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GstVideoDecoderClass parent_class;
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/**
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* GstH264DecoderClass::new_sequence:
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* @decoder: a #GstH264Decoder
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* @sps: a #GstH264SPS
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* @max_dpb_size: the size of dpb including preferred output delay
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* by subclass reported via get_preferred_output_delay method.
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*
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* Notifies subclass of SPS update
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*/
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gboolean (*new_sequence) (GstH264Decoder * decoder,
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const GstH264SPS * sps,
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gint max_dpb_size);
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/**
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* GstH264DecoderClass::new_picture:
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* @decoder: a #GstH264Decoder
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* @frame: (transfer none): a #GstVideoCodecFrame
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* @picture: (transfer none): a #GstH264Picture
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*
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* Optional. Called whenever new #GstH264Picture is created.
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* Subclass can set implementation specific user data
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* on the #GstH264Picture via gst_h264_picture_set_user_data()
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*/
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gboolean (*new_picture) (GstH264Decoder * decoder,
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GstVideoCodecFrame * frame,
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GstH264Picture * picture);
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/**
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* GstH264DecoderClass::new_field_picture:
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* @decoder: a #GstH264Decoder
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* @first_field: (transfer none): the first field #GstH264Picture already decoded
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* @second_field: (transfer none): a #GstH264Picture 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_h264_picture_set_user_data()
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*
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* Since: 1.20
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*/
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gboolean (*new_field_picture) (GstH264Decoder * decoder,
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const GstH264Picture * first_field,
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GstH264Picture * second_field);
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/**
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* GstH264DecoderClass::start_picture:
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* @decoder: a #GstH264Decoder
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* @picture: (transfer none): a #GstH264Picture
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* @slice: (transfer none): a #GstH264Slice
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* @dpb: (transfer none): a #GstH264Dpb
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*
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* Optional. Called per one #GstH264Picture to notify subclass to prepare
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* decoding process for the #GstH264Picture
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*/
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gboolean (*start_picture) (GstH264Decoder * decoder,
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GstH264Picture * picture,
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GstH264Slice * slice,
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GstH264Dpb * dpb);
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/**
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* GstH264DecoderClass::decode_slice:
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* @decoder: a #GstH264Decoder
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* @picture: (transfer none): a #GstH264Picture
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* @slice: (transfer none): a #GstH264Slice
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* @ref_pic_list0: (element-type GstH264Picture) (transfer none):
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* an array of #GstH264Picture pointers
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* @ref_pic_list1: (element-type GstH264Picture) (transfer none):
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* an array of #GstH264Picture pointers
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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. If gst_h264_decoder_set_process_ref_pic_lists()
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* is called with %TRUE by the subclass, @ref_pic_list0 and @ref_pic_list1
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* are non-%NULL.
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* In case of interlaced stream, @ref_pic_list0 and @ref_pic_list1 will
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* contain only the first field of complementary reference field pair
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* if currently being decoded picture is a frame picture. Subclasses might
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* need to retrive the other field (i.e., the second field) of the picture
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* if needed.
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*/
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gboolean (*decode_slice) (GstH264Decoder * decoder,
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GstH264Picture * picture,
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GstH264Slice * slice,
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GArray * ref_pic_list0,
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GArray * ref_pic_list1);
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/**
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* GstH264DecoderClass::end_picture:
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* @decoder: a #GstH264Decoder
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* @picture: (transfer none): a #GstH264Picture
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*
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* Optional. Called per one #GstH264Picture to notify subclass to finish
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* decoding process for the #GstH264Picture
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*/
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gboolean (*end_picture) (GstH264Decoder * decoder,
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GstH264Picture * picture);
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/**
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* GstH264DecoderClass::output_picture:
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* @decoder: a #GstH264Decoder
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* @frame: (transfer full): a #GstVideoCodecFrame
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* @picture: (transfer full): a #GstH264Picture
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*
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* Called with a #GstH264Picture 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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GstFlowReturn (*output_picture) (GstH264Decoder * decoder,
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GstVideoCodecFrame * frame,
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GstH264Picture * picture);
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/**
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* GstH264DecoderClass::get_preferred_output_delay:
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* @decoder: a #GstH264Decoder
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* @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 frame
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*
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* Since: 1.20
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*/
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guint (*get_preferred_output_delay) (GstH264Decoder * decoder,
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gboolean 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(GstH264Decoder, gst_object_unref)
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GST_CODECS_API
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GType gst_h264_decoder_get_type (void);
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GST_CODECS_API
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void gst_h264_decoder_set_process_ref_pic_lists (GstH264Decoder * decoder,
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gboolean process);
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GST_CODECS_API
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GstH264Picture * gst_h264_decoder_get_picture (GstH264Decoder * decoder,
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guint32 system_frame_number);
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G_END_DECLS
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#endif /* __GST_H264_DECODER_H__ */
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