mirror of
https://github.com/FFmpeg/FFmpeg.git
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270 lines
9.1 KiB
C
270 lines
9.1 KiB
C
/*
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* XWD image format
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*
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "xwd.h"
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static av_cold int xwd_decode_init(AVCodecContext *avctx)
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{
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avctx->coded_frame = avcodec_alloc_frame();
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if (!avctx->coded_frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int xwd_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt)
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{
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AVFrame *p = avctx->coded_frame;
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const uint8_t *buf = avpkt->data;
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int i, ret, buf_size = avpkt->size;
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uint32_t version, header_size, vclass, ncolors;
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uint32_t xoffset, be, bpp, lsize, rsize;
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uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
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uint32_t rgb[3];
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uint8_t *ptr;
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GetByteContext gb;
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if (buf_size < XWD_HEADER_SIZE)
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return AVERROR_INVALIDDATA;
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bytestream2_init(&gb, buf, buf_size);
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header_size = bytestream2_get_be32u(&gb);
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version = bytestream2_get_be32u(&gb);
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if (version != XWD_VERSION) {
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av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
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return AVERROR_INVALIDDATA;
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}
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if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
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return AVERROR_INVALIDDATA;
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}
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pixformat = bytestream2_get_be32u(&gb);
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pixdepth = bytestream2_get_be32u(&gb);
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avctx->width = bytestream2_get_be32u(&gb);
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avctx->height = bytestream2_get_be32u(&gb);
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xoffset = bytestream2_get_be32u(&gb);
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be = bytestream2_get_be32u(&gb);
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bunit = bytestream2_get_be32u(&gb);
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bitorder = bytestream2_get_be32u(&gb);
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bpad = bytestream2_get_be32u(&gb);
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bpp = bytestream2_get_be32u(&gb);
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lsize = bytestream2_get_be32u(&gb);
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vclass = bytestream2_get_be32u(&gb);
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rgb[0] = bytestream2_get_be32u(&gb);
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rgb[1] = bytestream2_get_be32u(&gb);
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rgb[2] = bytestream2_get_be32u(&gb);
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bytestream2_skipu(&gb, 8);
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ncolors = bytestream2_get_be32u(&gb);
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bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
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av_log(avctx, AV_LOG_DEBUG, "pixformat %d, pixdepth %d, bunit %d, bitorder %d, bpad %d\n",
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pixformat, pixdepth, bunit, bitorder, bpad);
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av_log(avctx, AV_LOG_DEBUG, "vclass %d, ncolors %d, bpp %d, be %d, lsize %d, xoffset %d\n",
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vclass, ncolors, bpp, be, lsize, xoffset);
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av_log(avctx, AV_LOG_DEBUG, "red %0x, green %0x, blue %0x\n", rgb[0], rgb[1], rgb[2]);
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if (pixformat > XWD_Z_PIXMAP) {
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av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");
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return AVERROR_INVALIDDATA;
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}
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if (pixdepth == 0 || pixdepth > 32) {
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av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");
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return AVERROR_INVALIDDATA;
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}
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if (xoffset) {
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av_log_ask_for_sample(avctx, "unsupported xoffset %d\n", xoffset);
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return AVERROR_PATCHWELCOME;
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}
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if (be > 1) {
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av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");
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return AVERROR_INVALIDDATA;
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}
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if (bitorder > 1) {
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av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");
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return AVERROR_INVALIDDATA;
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}
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if (bunit != 8 && bunit != 16 && bunit != 32) {
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av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");
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return AVERROR_INVALIDDATA;
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}
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if (bpad != 8 && bpad != 16 && bpad != 32) {
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av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");
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return AVERROR_INVALIDDATA;
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}
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if (bpp == 0 || bpp > 32) {
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av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");
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return AVERROR_INVALIDDATA;
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}
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if (ncolors > 256) {
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av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)
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return ret;
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rsize = FFALIGN(avctx->width * bpp, bpad) / 8;
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if (lsize < rsize) {
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av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");
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return AVERROR_INVALIDDATA;
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}
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if (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + avctx->height * lsize) {
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av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
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return AVERROR_INVALIDDATA;
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}
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if (pixformat != XWD_Z_PIXMAP) {
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av_log(avctx, AV_LOG_ERROR, "pixmap format %d unsupported\n", pixformat);
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return AVERROR_PATCHWELCOME;
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}
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avctx->pix_fmt = PIX_FMT_NONE;
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switch (vclass) {
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case XWD_STATIC_GRAY:
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case XWD_GRAY_SCALE:
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if (bpp != 1)
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return AVERROR_INVALIDDATA;
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if (pixdepth == 1)
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avctx->pix_fmt = PIX_FMT_MONOWHITE;
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break;
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case XWD_STATIC_COLOR:
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case XWD_PSEUDO_COLOR:
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if (bpp == 8)
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avctx->pix_fmt = PIX_FMT_PAL8;
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break;
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case XWD_TRUE_COLOR:
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case XWD_DIRECT_COLOR:
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if (bpp != 16 && bpp != 24 && bpp != 32)
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return AVERROR_INVALIDDATA;
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if (bpp == 16 && pixdepth == 15) {
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if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)
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avctx->pix_fmt = be ? PIX_FMT_RGB555BE : PIX_FMT_RGB555LE;
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else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)
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avctx->pix_fmt = be ? PIX_FMT_BGR555BE : PIX_FMT_BGR555LE;
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} else if (bpp == 16 && pixdepth == 16) {
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if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)
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avctx->pix_fmt = be ? PIX_FMT_RGB565BE : PIX_FMT_RGB565LE;
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else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)
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avctx->pix_fmt = be ? PIX_FMT_BGR565BE : PIX_FMT_BGR565LE;
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} else if (bpp == 24) {
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if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
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avctx->pix_fmt = be ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
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else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
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avctx->pix_fmt = be ? PIX_FMT_BGR24 : PIX_FMT_RGB24;
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} else if (bpp == 32) {
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if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
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avctx->pix_fmt = be ? PIX_FMT_ARGB : PIX_FMT_BGRA;
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else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
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avctx->pix_fmt = be ? PIX_FMT_ABGR : PIX_FMT_RGBA;
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}
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bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
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return AVERROR_INVALIDDATA;
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}
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if (avctx->pix_fmt == PIX_FMT_NONE) {
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av_log_ask_for_sample(avctx, "unknown file: bpp %d, pixdepth %d, vclass %d\n", bpp, pixdepth, vclass);
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return AVERROR_PATCHWELCOME;
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}
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if (p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference = 0;
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if ((ret = avctx->get_buffer(avctx, p)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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p->key_frame = 1;
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p->pict_type = AV_PICTURE_TYPE_I;
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if (avctx->pix_fmt == PIX_FMT_PAL8) {
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uint32_t *dst = (uint32_t *)p->data[1];
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uint8_t red, green, blue;
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for (i = 0; i < ncolors; i++) {
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bytestream2_skipu(&gb, 4); // skip colormap entry number
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red = bytestream2_get_byteu(&gb);
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bytestream2_skipu(&gb, 1);
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green = bytestream2_get_byteu(&gb);
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bytestream2_skipu(&gb, 1);
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blue = bytestream2_get_byteu(&gb);
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bytestream2_skipu(&gb, 3); // skip bitmask flag and padding
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dst[i] = red << 16 | green << 8 | blue;
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}
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}
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ptr = p->data[0];
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for (i = 0; i < avctx->height; i++) {
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bytestream2_get_bufferu(&gb, ptr, rsize);
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bytestream2_skipu(&gb, lsize - rsize);
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ptr += p->linesize[0];
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame *)data = *p;
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return buf_size;
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}
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static av_cold int xwd_decode_close(AVCodecContext *avctx)
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{
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if (avctx->coded_frame->data[0])
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avctx->release_buffer(avctx, avctx->coded_frame);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_xwd_decoder = {
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.name = "xwd",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_XWD,
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.init = xwd_decode_init,
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.close = xwd_decode_close,
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.decode = xwd_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
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};
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