104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*
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* XWD 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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* XWD parser
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**/
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#include "libavutil/intreadwrite.h"
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#include "parser.h"
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#include "xwd.h"
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typedef struct XWDParseContext {
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ParseContext pc;
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int left;
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int idx;
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uint8_t hdr[XWD_HEADER_SIZE];
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} XWDParseContext;
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static int xwd_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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XWDParseContext *t = s->priv_data;
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ParseContext *pc = &t->pc;
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int next = END_NOT_FOUND;
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s->pict_type = AV_PICTURE_TYPE_NONE;
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*poutbuf = NULL;
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*poutbuf_size = 0;
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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 (int i = 0; i < buf_size; i++) {
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if (t->left > 0) {
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t->left--;
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if (t->left == 0) {
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next = i;
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break;
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}
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continue;
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}
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if (t->idx >= 100) {
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t->idx = 99;
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memmove(&t->hdr[0], &t->hdr[1], XWD_HEADER_SIZE-1);
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}
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t->hdr[t->idx++] = buf[i];
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if (t->idx >= 100 && AV_RB32(t->hdr + 4) == XWD_VERSION) {
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uint32_t header_size = AV_RB32(t->hdr + 0);
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uint32_t height = AV_RB32(t->hdr + 20);
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uint32_t lsize = AV_RB32(t->hdr + 48);
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uint32_t ncolors = AV_RB32(t->hdr + 76);
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uint32_t size = header_size + ncolors * XWD_CMAP_SIZE + height * lsize;
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pc->frame_start_found = 1;
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t->left = size - XWD_HEADER_SIZE + 1;
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t->idx = 0;
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memset(t->hdr, 0, sizeof(t->hdr));
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}
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}
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0)
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return buf_size;
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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_xwd_parser = {
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.codec_ids = { AV_CODEC_ID_XWD },
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.priv_data_size = sizeof(XWDParseContext),
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.parser_parse = xwd_parse,
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.parser_close = ff_parse_close,
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};
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