mirror of
https://github.com/librempeg/librempeg
synced 2024-11-22 18:49:58 +00:00
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
/**
|
|
* Copyright 2023 Elias Carotti <eliascrt at amazon dot it>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVUTIL_VIDEO_HINT_H
|
|
#define AVUTIL_VIDEO_HINT_H
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/frame.h"
|
|
|
|
typedef struct AVVideoRect {
|
|
uint32_t x, y;
|
|
uint32_t width, height;
|
|
} AVVideoRect;
|
|
|
|
typedef enum AVVideoHintType {
|
|
/* rectangled delimit the constant areas (unchanged), default is changed */
|
|
AV_VIDEO_HINT_TYPE_CONSTANT,
|
|
|
|
/* rectangled delimit the constant areas (changed), default is not changed */
|
|
AV_VIDEO_HINT_TYPE_CHANGED,
|
|
} AVVideoHintType;
|
|
|
|
typedef struct AVVideoHint {
|
|
/**
|
|
* Number of AVVideoRect present.
|
|
*
|
|
* May be 0, in which case no per-rectangle information is present. In this
|
|
* case the values of rect_offset / rect_size are unspecified and should
|
|
* not be accessed.
|
|
*/
|
|
size_t nb_rects;
|
|
|
|
/**
|
|
* Offset in bytes from the beginning of this structure at which the array
|
|
* of AVVideoRect starts.
|
|
*/
|
|
size_t rect_offset;
|
|
|
|
/**
|
|
* Size in bytes of AVVideoRect.
|
|
*/
|
|
size_t rect_size;
|
|
|
|
AVVideoHintType type;
|
|
} AVVideoHint;
|
|
|
|
static av_always_inline AVVideoRect *
|
|
av_video_hint_rects(const AVVideoHint *hints) {
|
|
return (AVVideoRect *)((uint8_t *)hints + hints->rect_offset);
|
|
}
|
|
|
|
static av_always_inline AVVideoRect *
|
|
av_video_hint_get_rect(const AVVideoHint *hints, size_t idx) {
|
|
return (AVVideoRect *)((uint8_t *)hints + hints->rect_offset + idx * hints->rect_size);
|
|
}
|
|
|
|
/**
|
|
* Allocate memory for the AVVideoHint struct along with an nb_rects-sized
|
|
* arrays of AVVideoRect.
|
|
*
|
|
* The side data contains a list of rectangles for the portions of the frame
|
|
* which changed from the last encoded one (and the remainder are assumed to be
|
|
* changed), or, alternately (depending on the type parameter) the unchanged
|
|
* ones (and the remanining ones are those which changed).
|
|
* Macroblocks will thus be hinted either to be P_SKIP-ped or go through the
|
|
* regular encoding procedure.
|
|
*
|
|
* It's responsibility of the caller to fill the AVRects accordingly, and to set
|
|
* the proper AVVideoHintType field.
|
|
*
|
|
* @param out_size if non-NULL, the size in bytes of the resulting data array is
|
|
* written here
|
|
*
|
|
* @return newly allocated AVVideoHint struct (must be freed by the caller using
|
|
* av_free()) on success, NULL on memory allocation failure
|
|
*/
|
|
AVVideoHint *av_video_hint_alloc(size_t nb_rects,
|
|
size_t *out_size);
|
|
|
|
/**
|
|
* Same as av_video_hint_alloc(), except newly-allocated AVVideoHint is attached
|
|
* as side data of type AV_FRAME_DATA_VIDEO_HINT_INFO to frame.
|
|
*/
|
|
AVVideoHint *av_video_hint_create_side_data(AVFrame *frame,
|
|
size_t nb_rects);
|
|
|
|
|
|
#endif /* AVUTIL_VIDEO_HINT_H */
|