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5012b4ab4c
Add side data type to provide hint to the video encoders about unchanged portions of each frame. Signed-off-by: Anton Khirnov <anton@khirnov.net>
108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/**
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* Copyright 2023 Elias Carotti <eliascrt at amazon dot it>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_VIDEO_HINT_H
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#define AVUTIL_VIDEO_HINT_H
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#include <stddef.h>
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#include <stdint.h>
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#include "libavutil/avassert.h"
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#include "libavutil/frame.h"
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typedef struct AVVideoRect {
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uint32_t x, y;
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uint32_t width, height;
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} AVVideoRect;
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typedef enum AVVideoHintType {
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/* rectangled delimit the constant areas (unchanged), default is changed */
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AV_VIDEO_HINT_TYPE_CONSTANT,
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/* rectangled delimit the constant areas (changed), default is not changed */
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AV_VIDEO_HINT_TYPE_CHANGED,
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} AVVideoHintType;
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typedef struct AVVideoHint {
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/**
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* Number of AVVideoRect present.
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*
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* May be 0, in which case no per-rectangle information is present. In this
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* case the values of rect_offset / rect_size are unspecified and should
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* not be accessed.
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*/
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size_t nb_rects;
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/**
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* Offset in bytes from the beginning of this structure at which the array
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* of AVVideoRect starts.
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*/
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size_t rect_offset;
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/**
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* Size in bytes of AVVideoRect.
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*/
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size_t rect_size;
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AVVideoHintType type;
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} AVVideoHint;
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static av_always_inline AVVideoRect *
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av_video_hint_rects(const AVVideoHint *hints) {
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return (AVVideoRect *)((uint8_t *)hints + hints->rect_offset);
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}
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static av_always_inline AVVideoRect *
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av_video_hint_get_rect(const AVVideoHint *hints, size_t idx) {
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return (AVVideoRect *)((uint8_t *)hints + hints->rect_offset + idx * hints->rect_size);
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}
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/**
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* Allocate memory for the AVVideoHint struct along with an nb_rects-sized
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* arrays of AVVideoRect.
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*
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* The side data contains a list of rectangles for the portions of the frame
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* which changed from the last encoded one (and the remainder are assumed to be
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* changed), or, alternately (depending on the type parameter) the unchanged
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* ones (and the remanining ones are those which changed).
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* Macroblocks will thus be hinted either to be P_SKIP-ped or go through the
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* regular encoding procedure.
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*
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* It's responsibility of the caller to fill the AVRects accordingly, and to set
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* the proper AVVideoHintType field.
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*
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* @param out_size if non-NULL, the size in bytes of the resulting data array is
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* written here
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*
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* @return newly allocated AVVideoHint struct (must be freed by the caller using
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* av_free()) on success, NULL on memory allocation failure
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*/
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AVVideoHint *av_video_hint_alloc(size_t nb_rects,
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size_t *out_size);
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/**
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* Same as av_video_hint_alloc(), except newly-allocated AVVideoHint is attached
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* as side data of type AV_FRAME_DATA_VIDEO_HINT_INFO to frame.
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*/
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AVVideoHint *av_video_hint_create_side_data(AVFrame *frame,
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size_t nb_rects);
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#endif /* AVUTIL_VIDEO_HINT_H */
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