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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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6434d69f8c
It's almost pointless and makes little sense as subclass might want to modify refcount of the object or so. And all subclasses are already casting them to non-const version as well. In a general sense, we need to avoid passing refcounted object with const qualifier. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1238>
257 lines
9.6 KiB
C
257 lines
9.6 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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/**
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* GstH264DecoderCompliance:
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* @GST_H264_DECODER_COMPLIANCE_AUTO: The decoder behavior is
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* automatically choosen.
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* @GST_H264_DECODER_COMPLIANCE_STRICT: The decoder behavior strictly
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* conforms to the SPEC. All the decoder behaviors conform to the
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* SPEC, not including any nonstandard behavior which is not
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* mentioned in the SPEC.
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* @GST_H264_DECODER_COMPLIANCE_NORMAL: The decoder behavior normally
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* conforms to the SPEC. Most behaviors conform to the SPEC but
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* including some nonstandard features which are widely used or
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* often used in the industry practice. This meets the request of
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* real streams and usages, but may not 100% conform to the
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* SPEC. It has very low risk. E.g., we will output pictures
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* without waiting DPB being full for the lower latency, which may
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* cause B frame disorder when there are reference frames with
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* smaller POC after it in decoder order. And the baseline profile
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* may be mapped to the constrained-baseline profile, but it may
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* have problems when a real baseline stream comes with FMO or
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* ASO.
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* @GST_H264_DECODER_COMPLIANCE_FLEXIBLE: The decoder behavior
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* flexibly conforms to the SPEC. It uses the nonstandard features
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* more aggressively in order to get better performance(for
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* example, lower latency). It may change the result of the
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* decoder and should be used carefully. Besides including all
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* risks in *normal* mode, it has more risks, such as frames
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* disorder when reference frames POC decrease in decoder order.
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*
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* Since: 1.20
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*/
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typedef enum
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{
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GST_H264_DECODER_COMPLIANCE_AUTO,
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GST_H264_DECODER_COMPLIANCE_STRICT,
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GST_H264_DECODER_COMPLIANCE_NORMAL,
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GST_H264_DECODER_COMPLIANCE_FLEXIBLE
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} GstH264DecoderCompliance;
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#define GST_TYPE_H264_DECODER_COMPLIANCE (gst_h264_decoder_compliance_get_type())
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GST_CODECS_API
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GType gst_h264_decoder_compliance_get_type (void);
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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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/*< private >*/
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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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GstFlowReturn (*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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GstFlowReturn (*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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GstFlowReturn (*new_field_picture) (GstH264Decoder * decoder,
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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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GstFlowReturn (*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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GstFlowReturn (*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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GstFlowReturn (*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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