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https://github.com/FFmpeg/FFmpeg.git
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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>
82 lines
2.1 KiB
C
82 lines
2.1 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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#include <string.h>
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#include "avstring.h"
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#include "frame.h"
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#include "macros.h"
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#include "mem.h"
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#include "video_hint.h"
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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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struct TestStruct {
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AVVideoHint hint;
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AVVideoRect rect;
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};
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const size_t rect_offset = offsetof(struct TestStruct, rect);
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size_t size = rect_offset;
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AVVideoHint *hint;
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*out_size = 0;
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if (nb_rects > (SIZE_MAX - size) / sizeof(AVVideoRect))
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return NULL;
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size += sizeof(AVVideoRect) * nb_rects;
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hint = av_mallocz(size);
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if (!hint)
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return NULL;
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hint->nb_rects = nb_rects;
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hint->rect_offset = rect_offset;
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hint->rect_size = sizeof(AVVideoRect);
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*out_size = size;
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return hint;
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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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{
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AVVideoHint *hint;
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AVBufferRef *buf;
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size_t size = 0;
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hint = av_video_hint_alloc(nb_rects, &size);
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if (!hint)
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return NULL;
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buf = av_buffer_create((uint8_t *)hint, size, NULL, NULL, 0);
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if (!buf) {
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av_freep(&hint);
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return NULL;
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}
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if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_VIDEO_HINT, buf)) {
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av_buffer_unref(&buf);
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return NULL;
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}
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return hint;
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}
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