| /* |
| * XWD parser |
| * Copyright (c) 2022 Paul B Mahol |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * XWD parser |
| **/ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "parser.h" |
| #include "xwd.h" |
| |
| typedef struct XWDParseContext { |
| ParseContext pc; |
| int left; |
| int idx; |
| uint8_t hdr[XWD_HEADER_SIZE]; |
| } XWDParseContext; |
| |
| static int xwd_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
| const uint8_t **poutbuf, int *poutbuf_size, |
| const uint8_t *buf, int buf_size) |
| { |
| XWDParseContext *t = s->priv_data; |
| ParseContext *pc = &t->pc; |
| int next = END_NOT_FOUND; |
| |
| s->pict_type = AV_PICTURE_TYPE_NONE; |
| |
| *poutbuf = NULL; |
| *poutbuf_size = 0; |
| |
| if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
| next = buf_size; |
| } else { |
| for (int i = 0; i < buf_size; i++) { |
| if (t->left > 0) { |
| t->left--; |
| if (t->left == 0) { |
| next = i; |
| break; |
| } |
| continue; |
| } |
| |
| if (t->idx >= 100) { |
| t->idx = 99; |
| memmove(&t->hdr[0], &t->hdr[1], XWD_HEADER_SIZE-1); |
| } |
| |
| t->hdr[t->idx++] = buf[i]; |
| |
| if (t->idx >= 100 && AV_RB32(t->hdr + 4) == XWD_VERSION) { |
| uint32_t header_size = AV_RB32(t->hdr + 0); |
| uint32_t height = AV_RB32(t->hdr + 20); |
| uint32_t lsize = AV_RB32(t->hdr + 48); |
| uint32_t ncolors = AV_RB32(t->hdr + 76); |
| uint32_t size = header_size + ncolors * XWD_CMAP_SIZE + height * lsize; |
| pc->frame_start_found = 1; |
| t->left = size - XWD_HEADER_SIZE + 1; |
| t->idx = 0; |
| memset(t->hdr, 0, sizeof(t->hdr)); |
| } |
| } |
| |
| if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) |
| return buf_size; |
| } |
| |
| *poutbuf = buf; |
| *poutbuf_size = buf_size; |
| |
| s->pict_type = AV_PICTURE_TYPE_I; |
| s->key_frame = 1; |
| s->duration = 1; |
| |
| return next; |
| } |
| |
| const AVCodecParser ff_xwd_parser = { |
| .codec_ids = { AV_CODEC_ID_XWD }, |
| .priv_data_size = sizeof(XWDParseContext), |
| .parser_parse = xwd_parse, |
| .parser_close = ff_parse_close, |
| }; |