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/* GStreamer
* Copyright (C) 2019 Seungha Yang <seungha.yang@navercorp.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_H264_DECODER_H__
#define __GST_H264_DECODER_H__
#include <gst/codecs/codecs-prelude.h>
#include <gst/video/video.h>
#include <gst/codecparsers/gsth264parser.h>
#include <gst/codecs/gsth264picture.h>
G_BEGIN_DECLS
#define GST_TYPE_H264_DECODER (gst_h264_decoder_get_type())
#define GST_H264_DECODER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_H264_DECODER,GstH264Decoder))
#define GST_H264_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_H264_DECODER,GstH264DecoderClass))
#define GST_H264_DECODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_H264_DECODER,GstH264DecoderClass))
#define GST_IS_H264_DECODER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_H264_DECODER))
#define GST_IS_H264_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_H264_DECODER))
#define GST_H264_DECODER_CAST(obj) ((GstH264Decoder*)obj)
/**
* GstH264DecoderCompliance:
* @GST_H264_DECODER_COMPLIANCE_AUTO: The decoder behavior is
* automatically choosen.
* @GST_H264_DECODER_COMPLIANCE_STRICT: The decoder behavior strictly
* conforms to the SPEC. All the decoder behaviors conform to the
* SPEC, not including any nonstandard behavior which is not
* mentioned in the SPEC.
* @GST_H264_DECODER_COMPLIANCE_NORMAL: The decoder behavior normally
* conforms to the SPEC. Most behaviors conform to the SPEC but
* including some nonstandard features which are widely used or
* often used in the industry practice. This meets the request of
* real streams and usages, but may not 100% conform to the
* SPEC. It has very low risk. E.g., we will output pictures
* without waiting DPB being full for the lower latency, which may
* cause B frame disorder when there are reference frames with
* smaller POC after it in decoder order. And the baseline profile
* may be mapped to the constrained-baseline profile, but it may
* have problems when a real baseline stream comes with FMO or
* ASO.
* @GST_H264_DECODER_COMPLIANCE_FLEXIBLE: The decoder behavior
* flexibly conforms to the SPEC. It uses the nonstandard features
* more aggressively in order to get better performance(for
* example, lower latency). It may change the result of the
* decoder and should be used carefully. Besides including all
* risks in *normal* mode, it has more risks, such as frames
* disorder when reference frames POC decrease in decoder order.
*
* Since: 1.20
*/
typedef enum
{
GST_H264_DECODER_COMPLIANCE_AUTO,
GST_H264_DECODER_COMPLIANCE_STRICT,
GST_H264_DECODER_COMPLIANCE_NORMAL,
GST_H264_DECODER_COMPLIANCE_FLEXIBLE
} GstH264DecoderCompliance;
#define GST_TYPE_H264_DECODER_COMPLIANCE (gst_h264_decoder_compliance_get_type())
GST_CODECS_API
GType gst_h264_decoder_compliance_get_type (void);
typedef struct _GstH264Decoder GstH264Decoder;
typedef struct _GstH264DecoderClass GstH264DecoderClass;
typedef struct _GstH264DecoderPrivate GstH264DecoderPrivate;
/**
* GstH264Decoder:
*
* The opaque #GstH264Decoder data structure.
*/
struct _GstH264Decoder
{
/*< private >*/
GstVideoDecoder parent;
/*< protected >*/
GstVideoCodecState * input_state;
/*< private >*/
GstH264DecoderPrivate *priv;
gpointer padding[GST_PADDING_LARGE];
};
/**
* GstH264DecoderClass:
*
* The opaque #GstH264DecoderClass data structure.
*/
struct _GstH264DecoderClass
{
/*< private >*/
GstVideoDecoderClass parent_class;
/**
* GstH264DecoderClass::new_sequence:
* @decoder: a #GstH264Decoder
* @sps: a #GstH264SPS
* @max_dpb_size: the size of dpb including preferred output delay
* by subclass reported via get_preferred_output_delay method.
*
* Notifies subclass of SPS update
*/
gboolean (*new_sequence) (GstH264Decoder * decoder,
const GstH264SPS * sps,
gint max_dpb_size);
/**
* GstH264DecoderClass::new_picture:
* @decoder: a #GstH264Decoder
* @frame: (transfer none): a #GstVideoCodecFrame
* @picture: (transfer none): a #GstH264Picture
*
* Optional. Called whenever new #GstH264Picture is created.
* Subclass can set implementation specific user data
* on the #GstH264Picture via gst_h264_picture_set_user_data()
*/
gboolean (*new_picture) (GstH264Decoder * decoder,
GstVideoCodecFrame * frame,
GstH264Picture * picture);
/**
* GstH264DecoderClass::new_field_picture:
* @decoder: a #GstH264Decoder
* @first_field: (transfer none): the first field #GstH264Picture already decoded
* @second_field: (transfer none): a #GstH264Picture for the second field
*
* Called when a new field picture is created for interlaced field picture.
* Subclass can attach implementation specific user data on @second_field via
* gst_h264_picture_set_user_data()
*
* Since: 1.20
*/
gboolean (*new_field_picture) (GstH264Decoder * decoder,
const GstH264Picture * first_field,
GstH264Picture * second_field);
/**
* GstH264DecoderClass::start_picture:
* @decoder: a #GstH264Decoder
* @picture: (transfer none): a #GstH264Picture
* @slice: (transfer none): a #GstH264Slice
* @dpb: (transfer none): a #GstH264Dpb
*
* Optional. Called per one #GstH264Picture to notify subclass to prepare
* decoding process for the #GstH264Picture
*/
gboolean (*start_picture) (GstH264Decoder * decoder,
GstH264Picture * picture,
GstH264Slice * slice,
GstH264Dpb * dpb);
/**
* GstH264DecoderClass::decode_slice:
* @decoder: a #GstH264Decoder
* @picture: (transfer none): a #GstH264Picture
* @slice: (transfer none): a #GstH264Slice
* @ref_pic_list0: (element-type GstH264Picture) (transfer none):
* an array of #GstH264Picture pointers
* @ref_pic_list1: (element-type GstH264Picture) (transfer none):
* an array of #GstH264Picture pointers
*
* Provides per slice data with parsed slice header and required raw bitstream
* for subclass to decode it. If gst_h264_decoder_set_process_ref_pic_lists()
* is called with %TRUE by the subclass, @ref_pic_list0 and @ref_pic_list1
* are non-%NULL.
* In case of interlaced stream, @ref_pic_list0 and @ref_pic_list1 will
* contain only the first field of complementary reference field pair
* if currently being decoded picture is a frame picture. Subclasses might
* need to retrive the other field (i.e., the second field) of the picture
* if needed.
*/
gboolean (*decode_slice) (GstH264Decoder * decoder,
GstH264Picture * picture,
GstH264Slice * slice,
GArray * ref_pic_list0,
GArray * ref_pic_list1);
/**
* GstH264DecoderClass::end_picture:
* @decoder: a #GstH264Decoder
* @picture: (transfer none): a #GstH264Picture
*
* Optional. Called per one #GstH264Picture to notify subclass to finish
* decoding process for the #GstH264Picture
*/
gboolean (*end_picture) (GstH264Decoder * decoder,
GstH264Picture * picture);
/**
* GstH264DecoderClass::output_picture:
* @decoder: a #GstH264Decoder
* @frame: (transfer full): a #GstVideoCodecFrame
* @picture: (transfer full): a #GstH264Picture
*
* Called with a #GstH264Picture which is required to be outputted.
* The #GstVideoCodecFrame must be consumed by subclass.
*/
GstFlowReturn (*output_picture) (GstH264Decoder * decoder,
GstVideoCodecFrame * frame,
GstH264Picture * picture);
/**
* GstH264DecoderClass::get_preferred_output_delay:
* @decoder: a #GstH264Decoder
* @live: whether upstream is live or not
*
* Optional. Called by baseclass to query whether delaying output is
* preferred by subclass or not.
*
* Returns: the number of perferred delayed output frame
*
* Since: 1.20
*/
guint (*get_preferred_output_delay) (GstH264Decoder * decoder,
gboolean live);
/*< private >*/
gpointer padding[GST_PADDING_LARGE];
};
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstH264Decoder, gst_object_unref)
GST_CODECS_API
GType gst_h264_decoder_get_type (void);
GST_CODECS_API
void gst_h264_decoder_set_process_ref_pic_lists (GstH264Decoder * decoder,
gboolean process);
GST_CODECS_API
GstH264Picture * gst_h264_decoder_get_picture (GstH264Decoder * decoder,
guint32 system_frame_number);
G_END_DECLS
#endif /* __GST_H264_DECODER_H__ */
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