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3c975ed918
Some features such as the low-latency DPB bumping and mapping the baseline profile as the constrained-baseline profile do not conform to the H264 offical spec. But in practice, they are very useful and are widely needed. We add this compliance property to control the behavior of the decoder, make it fit more requirement. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2432>
256 lines
9.6 KiB
C
256 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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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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