2 * Copyright (C) 2019 Seungha Yang <seungha.yang@navercorp.com>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
20 #ifndef __GST_H264_DECODER_H__
21 #define __GST_H264_DECODER_H__
23 #include <gst/codecs/codecs-prelude.h>
25 #include <gst/video/video.h>
26 #include <gst/codecparsers/gsth264parser.h>
27 #include <gst/codecs/gsth264picture.h>
31 #define GST_TYPE_H264_DECODER (gst_h264_decoder_get_type())
32 #define GST_H264_DECODER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_H264_DECODER,GstH264Decoder))
33 #define GST_H264_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_H264_DECODER,GstH264DecoderClass))
34 #define GST_H264_DECODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_H264_DECODER,GstH264DecoderClass))
35 #define GST_IS_H264_DECODER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_H264_DECODER))
36 #define GST_IS_H264_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_H264_DECODER))
37 #define GST_H264_DECODER_CAST(obj) ((GstH264Decoder*)obj)
40 * GstH264DecoderCompliance:
41 * @GST_H264_DECODER_COMPLIANCE_AUTO: The decoder behavior is
42 * automatically choosen.
43 * @GST_H264_DECODER_COMPLIANCE_STRICT: The decoder behavior strictly
44 * conforms to the SPEC. All the decoder behaviors conform to the
45 * SPEC, not including any nonstandard behavior which is not
46 * mentioned in the SPEC.
47 * @GST_H264_DECODER_COMPLIANCE_NORMAL: The decoder behavior normally
48 * conforms to the SPEC. Most behaviors conform to the SPEC but
49 * including some nonstandard features which are widely used or
50 * often used in the industry practice. This meets the request of
51 * real streams and usages, but may not 100% conform to the
52 * SPEC. It has very low risk. E.g., we will output pictures
53 * without waiting DPB being full for the lower latency, which may
54 * cause B frame disorder when there are reference frames with
55 * smaller POC after it in decoder order. And the baseline profile
56 * may be mapped to the constrained-baseline profile, but it may
57 * have problems when a real baseline stream comes with FMO or
59 * @GST_H264_DECODER_COMPLIANCE_FLEXIBLE: The decoder behavior
60 * flexibly conforms to the SPEC. It uses the nonstandard features
61 * more aggressively in order to get better performance(for
62 * example, lower latency). It may change the result of the
63 * decoder and should be used carefully. Besides including all
64 * risks in *normal* mode, it has more risks, such as frames
65 * disorder when reference frames POC decrease in decoder order.
71 GST_H264_DECODER_COMPLIANCE_AUTO,
72 GST_H264_DECODER_COMPLIANCE_STRICT,
73 GST_H264_DECODER_COMPLIANCE_NORMAL,
74 GST_H264_DECODER_COMPLIANCE_FLEXIBLE
75 } GstH264DecoderCompliance;
77 #define GST_TYPE_H264_DECODER_COMPLIANCE (gst_h264_decoder_compliance_get_type())
80 GType gst_h264_decoder_compliance_get_type (void);
82 typedef struct _GstH264Decoder GstH264Decoder;
83 typedef struct _GstH264DecoderClass GstH264DecoderClass;
84 typedef struct _GstH264DecoderPrivate GstH264DecoderPrivate;
89 * The opaque #GstH264Decoder data structure.
91 struct _GstH264Decoder
94 GstVideoDecoder parent;
97 GstVideoCodecState * input_state;
100 GstH264DecoderPrivate *priv;
101 gpointer padding[GST_PADDING_LARGE];
105 * GstH264DecoderClass:
107 * The opaque #GstH264DecoderClass data structure.
109 struct _GstH264DecoderClass
112 GstVideoDecoderClass parent_class;
115 * GstH264DecoderClass::new_sequence:
116 * @decoder: a #GstH264Decoder
117 * @sps: a #GstH264SPS
118 * @max_dpb_size: the size of dpb including preferred output delay
119 * by subclass reported via get_preferred_output_delay method.
121 * Notifies subclass of SPS update
123 GstFlowReturn (*new_sequence) (GstH264Decoder * decoder,
124 const GstH264SPS * sps,
128 * GstH264DecoderClass::new_picture:
129 * @decoder: a #GstH264Decoder
130 * @frame: (transfer none): a #GstVideoCodecFrame
131 * @picture: (transfer none): a #GstH264Picture
133 * Optional. Called whenever new #GstH264Picture is created.
134 * Subclass can set implementation specific user data
135 * on the #GstH264Picture via gst_h264_picture_set_user_data()
137 GstFlowReturn (*new_picture) (GstH264Decoder * decoder,
138 GstVideoCodecFrame * frame,
139 GstH264Picture * picture);
142 * GstH264DecoderClass::new_field_picture:
143 * @decoder: a #GstH264Decoder
144 * @first_field: (transfer none): the first field #GstH264Picture already decoded
145 * @second_field: (transfer none): a #GstH264Picture for the second field
147 * Called when a new field picture is created for interlaced field picture.
148 * Subclass can attach implementation specific user data on @second_field via
149 * gst_h264_picture_set_user_data()
153 GstFlowReturn (*new_field_picture) (GstH264Decoder * decoder,
154 GstH264Picture * first_field,
155 GstH264Picture * second_field);
158 * GstH264DecoderClass::start_picture:
159 * @decoder: a #GstH264Decoder
160 * @picture: (transfer none): a #GstH264Picture
161 * @slice: (transfer none): a #GstH264Slice
162 * @dpb: (transfer none): a #GstH264Dpb
164 * Optional. Called per one #GstH264Picture to notify subclass to prepare
165 * decoding process for the #GstH264Picture
167 GstFlowReturn (*start_picture) (GstH264Decoder * decoder,
168 GstH264Picture * picture,
169 GstH264Slice * slice,
173 * GstH264DecoderClass::decode_slice:
174 * @decoder: a #GstH264Decoder
175 * @picture: (transfer none): a #GstH264Picture
176 * @slice: (transfer none): a #GstH264Slice
177 * @ref_pic_list0: (element-type GstH264Picture) (transfer none):
178 * an array of #GstH264Picture pointers
179 * @ref_pic_list1: (element-type GstH264Picture) (transfer none):
180 * an array of #GstH264Picture pointers
182 * Provides per slice data with parsed slice header and required raw bitstream
183 * for subclass to decode it. If gst_h264_decoder_set_process_ref_pic_lists()
184 * is called with %TRUE by the subclass, @ref_pic_list0 and @ref_pic_list1
186 * In case of interlaced stream, @ref_pic_list0 and @ref_pic_list1 will
187 * contain only the first field of complementary reference field pair
188 * if currently being decoded picture is a frame picture. Subclasses might
189 * need to retrive the other field (i.e., the second field) of the picture
192 GstFlowReturn (*decode_slice) (GstH264Decoder * decoder,
193 GstH264Picture * picture,
194 GstH264Slice * slice,
195 GArray * ref_pic_list0,
196 GArray * ref_pic_list1);
199 * GstH264DecoderClass::end_picture:
200 * @decoder: a #GstH264Decoder
201 * @picture: (transfer none): a #GstH264Picture
203 * Optional. Called per one #GstH264Picture to notify subclass to finish
204 * decoding process for the #GstH264Picture
206 GstFlowReturn (*end_picture) (GstH264Decoder * decoder,
207 GstH264Picture * picture);
210 * GstH264DecoderClass::output_picture:
211 * @decoder: a #GstH264Decoder
212 * @frame: (transfer full): a #GstVideoCodecFrame
213 * @picture: (transfer full): a #GstH264Picture
215 * Called with a #GstH264Picture which is required to be outputted.
216 * The #GstVideoCodecFrame must be consumed by subclass.
218 GstFlowReturn (*output_picture) (GstH264Decoder * decoder,
219 GstVideoCodecFrame * frame,
220 GstH264Picture * picture);
223 * GstH264DecoderClass::get_preferred_output_delay:
224 * @decoder: a #GstH264Decoder
225 * @live: whether upstream is live or not
227 * Optional. Called by baseclass to query whether delaying output is
228 * preferred by subclass or not.
230 * Returns: the number of perferred delayed output frame
234 guint (*get_preferred_output_delay) (GstH264Decoder * decoder,
238 gpointer padding[GST_PADDING_LARGE];
241 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstH264Decoder, gst_object_unref)
244 GType gst_h264_decoder_get_type (void);
247 void gst_h264_decoder_set_process_ref_pic_lists (GstH264Decoder * decoder,
251 GstH264Picture * gst_h264_decoder_get_picture (GstH264Decoder * decoder,
252 guint32 system_frame_number);
256 #endif /* __GST_H264_DECODER_H__ */