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cc30854893
This base class is intented for hardware accelerated decoders, but since only VA uses it, it will be kept internally in va plugin. It follows the same logic as the others video decoders in the library but. as JPEG are independet images, there's no need to handle a DBP so no need of a picture object. Instead a scan object is added with all the structures required to decode the image (huffman and quant tables, mcus, etc.). Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1575>
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/* GStreamer
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* Copyright (C) 2022 Víctor Jáquez <vjaquez@igalia.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_JPEG_DECODER_H__
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#define __GST_JPEG_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/gstjpegparser.h>
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G_BEGIN_DECLS
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#define GST_TYPE_JPEG_DECODER (gst_jpeg_decoder_get_type())
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#define GST_JPEG_DECODER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_JPEG_DECODER,GstJpegDecoder))
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#define GST_JPEG_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_JPEG_DECODER,GstJpegDecoderClass))
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#define GST_JPEG_DECODER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_JPEG_DECODER,GstJpegDecoderClass))
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#define GST_IS_JPEG_DECODER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_JPEG_DECODER))
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#define GST_IS_JPEG_DECODER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_JPEG_DECODER))
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#define GST_JPEG_DECODER_CAST(obj) ((GstJpegDecoder*)obj)
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typedef struct _GstJpegDecoderScan GstJpegDecoderScan;
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typedef struct _GstJpegDecoder GstJpegDecoder;
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typedef struct _GstJpegDecoderClass GstJpegDecoderClass;
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typedef struct _GstJpegDecoderPrivate GstJpegDecoderPrivate;
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/**
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* GstJpegDecoderScan:
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*
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* Container for a SOS segment.
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*/
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struct _GstJpegDecoderScan
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{
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GstJpegScanHdr *scan_hdr;
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GstJpegHuffmanTables *huffman_tables;
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GstJpegQuantTables *quantization_tables;
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guint restart_interval;
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guint mcus_per_row;
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guint mcu_rows_in_scan;
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};
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/**
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* GstJpegDecoder:
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*
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* The opaque #GstJpegDecoder data structure.
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*/
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struct _GstJpegDecoder
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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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GstJpegDecoderPrivate *priv;
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gpointer padding[GST_PADDING_LARGE];
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};
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/**
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* GstJpegDecoderClass:
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*
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* The opaque #GstJpegDecoderClass data structure.
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*/
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struct _GstJpegDecoderClass
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{
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/*< private >*/
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GstVideoDecoderClass parent_class;
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/**
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* GstJpegDecoderClass::new_picture:
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* @decoder: a #GstJpegDecoder
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* @frame: (transfer none): a #GstVideoCodecFrame
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* @frame_hdr: (transfer none): a #GstJpegFrameHdr
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*
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* Called whenever new picture is detected.
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*/
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GstFlowReturn (*new_picture) (GstJpegDecoder * decoder,
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GstVideoCodecFrame * frame,
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GstJpegMarker marker,
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GstJpegFrameHdr * frame_hdr);
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/**
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* GstJpegDecoderClass::decode_scan:
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* @decoder: a #GstJpegDecoder
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* @scan: (transfer none): a #GstJpegDecoderScan
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* @buffer: (transfer none): scan buffer
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* @size: size of @buffer
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*
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* Called whenever new scan is found.
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*/
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GstFlowReturn (*decode_scan) (GstJpegDecoder * decoder,
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GstJpegDecoderScan * scan,
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const guint8 * buffer,
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guint32 size);
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/**
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* GstJpegDecoderClass::end_picture:
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* @decoder: a #GstJpegDecoder
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*
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* Called whenever a picture end mark is found.
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*/
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GstFlowReturn (*end_picture) (GstJpegDecoder * decoder);
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/**
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* GstJpegDecoderClass::output_picture:
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* @decoder: a #GstJpegDecoder
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* @frame: (transfer full): a #GstVideoCodecFrame
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*
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* Called whenever a @frame is required to be outputted. The
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* #GstVideoCodecFrame must be consumed by subclass.
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*/
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GstFlowReturn (*output_picture) (GstJpegDecoder * decoder,
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GstVideoCodecFrame * frame);
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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(GstJpegDecoder, gst_object_unref)
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GST_CODECS_API
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GType gst_jpeg_decoder_get_type (void);
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G_END_DECLS
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#endif /* __GST_JPEG_DECODER_H__ */
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