mirror of
https://github.com/FFmpeg/FFmpeg.git
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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
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* Radiance HDR parser
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* Copyright (c) 2022 Paul B Mahol
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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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/**
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* @file
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* Radiance HDR parser
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*/
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#include "libavutil/intreadwrite.h"
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#include "parser.h"
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typedef struct HDRParseContext {
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ParseContext pc;
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} HDRParseContext;
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static int hdr_parse(AVCodecParserContext *s, AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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HDRParseContext *ipc = s->priv_data;
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uint64_t state = ipc->pc.state64;
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int next = END_NOT_FOUND, i = 0;
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*poutbuf_size = 0;
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*poutbuf = NULL;
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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next = buf_size;
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} else {
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for (; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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if (state == AV_RB64("ADIANCE\n") && (i > 10 || ipc->pc.index > 10)) {
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next = i - 10;
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break;
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}
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}
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ipc->pc.state64 = state;
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if (ff_combine_frame(&ipc->pc, next, &buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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}
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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s->pict_type = AV_PICTURE_TYPE_I;
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s->key_frame = 1;
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s->duration = 1;
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return next;
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}
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const AVCodecParser ff_hdr_parser = {
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.codec_ids = { AV_CODEC_ID_RADIANCE_HDR },
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.priv_data_size = sizeof(HDRParseContext),
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.parser_parse = hdr_parse,
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.parser_close = ff_parse_close,
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};
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