subprojects/gst-plugins-bad/gst-libs/gst/codecs/gstmpeg2decoder.h

   1 /* GStreamer
   2  * Copyright (C) 2020 Intel Corporation
   3  *     Author: He Junyan <junyan.he@intel.com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  18  * Boston, MA 02110-1301, USA.
  19  */
  20
  21 #ifndef __GST_MPEG2_DECODER_H__
  22 #define __GST_MPEG2_DECODER_H__
  23
  24 #include <gst/codecs/codecs-prelude.h>
  25
  26 #include <gst/video/video.h>
  27 #include <gst/codecparsers/gstmpegvideoparser.h>
  28 #include <gst/codecs/gstmpeg2picture.h>
  29
  30 G_BEGIN_DECLS
  31
  32 #define GST_TYPE_MPEG2_DECODER            (gst_mpeg2_decoder_get_type())
  33 #define GST_MPEG2_DECODER(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MPEG2_DECODER,GstMpeg2Decoder))
  34 #define GST_MPEG2_DECODER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MPEG2_DECODER,GstMpeg2DecoderClass))
  35 #define GST_MPEG2_DECODER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_MPEG2_DECODER,GstMpeg2DecoderClass))
  36 #define GST_IS_MPEG2_DECODER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MPEG2_DECODER))
  37 #define GST_IS_MPEG2_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MPEG2_DECODER))
  38
  39 typedef struct _GstMpeg2Decoder GstMpeg2Decoder;
  40 typedef struct _GstMpeg2DecoderClass GstMpeg2DecoderClass;
  41 typedef struct _GstMpeg2DecoderPrivate GstMpeg2DecoderPrivate;
  42
  43 /**
  44  * GstMpeg2Decoder:
  45  *
  46  * The opaque #GstMpeg2Decoder data structure.
  47  *
  48  * Since: 1.20
  49  */
  50 struct _GstMpeg2Decoder
  51 {
  52   /*< private >*/
  53   GstVideoDecoder parent;
  54
  55   /*< protected >*/
  56   GstVideoCodecState * input_state;
  57
  58   /*< private >*/
  59   GstMpeg2DecoderPrivate *priv;
  60
  61   gpointer padding[GST_PADDING_LARGE];
  62 };
  63
  64 /**
  65  * GstMpeg2DecoderClass:
  66  */
  67 struct _GstMpeg2DecoderClass
  68 {
  69   GstVideoDecoderClass parent_class;
  70
  71   /**
  72    * GstMpeg2DecoderClass::new_sequence:
  73    * @decoder: a #GstMpeg2Decoder
  74    * @seq: a #GstMpegVideoSequenceHdr
  75    * @seq_ext: a #GstMpegVideoSequenceExt
  76    *
  77    * Notifies subclass of SPS update
  78    *
  79    * Since: 1.20
  80    */
  81   gboolean      (*new_sequence)     (GstMpeg2Decoder * decoder,
  82                                      const GstMpegVideoSequenceHdr * seq,
  83                                      const GstMpegVideoSequenceExt * seq_ext,
  84                                      const GstMpegVideoSequenceDisplayExt * seq_display_ext,
  85                                      const GstMpegVideoSequenceScalableExt * seq_scalable_ext);
  86
  87   /**
  88    * GstMpeg2DecoderClass::new_picture:
  89    * @decoder: a #GstMpeg2Decoder
  90    * @frame: (transfer none): a #GstVideoCodecFrame
  91    * @picture: (transfer none): a #GstMpeg2Picture
  92    *
  93    * Optional. Called whenever new #GstMpeg2Picture is created.
  94    * Subclass can set implementation specific user data
  95    * on the #GstMpeg2Picture via gst_mpeg2_picture_set_user_data()
  96    *
  97    * Since: 1.20
  98    */
  99   gboolean      (*new_picture)      (GstMpeg2Decoder * decoder,
 100                                      GstVideoCodecFrame * frame,
 101                                      GstMpeg2Picture * picture);
 102
 103   /**
 104    * GstMpeg2DecoderClass::new_field_picture:
 105    * @decoder: a #GstMpeg2Decoder
 106    * @first_field: (transfer none): the first field #GstMpeg2Picture already decoded
 107    * @second_field: (transfer none): a #GstMpeg2Picture for the second field
 108    *
 109    * Called when a new field picture is created for interlaced field picture.
 110    * Subclass can attach implementation specific user data on @second_field via
 111    * gst_mpeg2_picture_set_user_data()
 112    *
 113    * Since: 1.20
 114    */
 115   gboolean      (*new_field_picture)  (GstMpeg2Decoder * decoder,
 116                                        const GstMpeg2Picture * first_field,
 117                                        GstMpeg2Picture * second_field);
 118
 119   /**
 120    * GstMpeg2DecoderClass::start_picture:
 121    * @decoder: a #GstMpeg2Decoder
 122    * @picture: (transfer none): a #GstMpeg2Picture
 123    * @slice: (transfer none): a #GstMpeg2Slice
 124    * @prev_picture: (transfer none): a #GstMpeg2Picture
 125    * @next_picture: (transfer none): a #GstMpeg2Picture
 126    *
 127    * Optional. Called per one #GstMpeg2Picture to notify subclass to prepare
 128    * decoding process for the #GstMpeg2Picture
 129    *
 130    * Since: 1.20
 131    */
 132   gboolean      (*start_picture)    (GstMpeg2Decoder * decoder,
 133                                      GstMpeg2Picture * picture,
 134                                      GstMpeg2Slice * slice,
 135                                      GstMpeg2Picture * prev_picture,
 136                                      GstMpeg2Picture * next_picture);
 137
 138   /**
 139    * GstMpeg2DecoderClass::decode_slice:
 140    * @decoder: a #GstMpeg2Decoder
 141    * @picture: (transfer none): a #GstMpeg2Picture
 142    * @slice: (transfer none): a #GstMpeg2Slice
 143    *
 144    * Provides per slice data with parsed slice header and required raw bitstream
 145    * for subclass to decode it.
 146    *
 147    * Since: 1.20
 148    */
 149   gboolean      (*decode_slice)     (GstMpeg2Decoder * decoder,
 150                                      GstMpeg2Picture * picture,
 151                                      GstMpeg2Slice * slice);
 152
 153   /**
 154    * GstMpeg2DecoderClass::end_picture:
 155    * @decoder: a #GstMpeg2Decoder
 156    * @picture: (transfer none): a #GstMpeg2Picture
 157    *
 158    * Optional. Called per one #GstMpeg2Picture to notify subclass to finish
 159    * decoding process for the #GstMpeg2Picture
 160    *
 161    * Since: 1.20
 162    */
 163   gboolean      (*end_picture)      (GstMpeg2Decoder * decoder,
 164                                      GstMpeg2Picture * picture);
 165
 166   /**
 167    * GstMpeg2DecoderClass::output_picture:
 168    * @decoder: a #GstMpeg2Decoder
 169    * @frame: (transfer full): a #GstVideoCodecFrame
 170    * @picture: (transfer full): a #GstMpeg2Picture
 171    *
 172    * Called with a #GstMpeg2Picture which is required to be outputted.
 173    * The #GstVideoCodecFrame must be consumed by subclass.
 174    *
 175    * Since: 1.20
 176    */
 177   GstFlowReturn (*output_picture)   (GstMpeg2Decoder * decoder,
 178                                      GstVideoCodecFrame * frame,
 179                                      GstMpeg2Picture * picture);
 180
 181   /*< private >*/
 182   gpointer padding[GST_PADDING_LARGE];
 183 };
 184
 185 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMpeg2Decoder, gst_object_unref)
 186
 187 GST_CODECS_API
 188 GType gst_mpeg2_decoder_get_type (void);
 189
 190 G_END_DECLS
 191
 192 #endif /* __GST_MPEG2_DECODER_H__ */