libavcodec/xwddec.c

   1 /*
   2  * XWD image format
   3  *
   4  * Copyright (c) 2012 Paul B Mahol
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <inttypes.h>
  24
  25 #include "libavutil/imgutils.h"
  26 #include "avcodec.h"
  27 #include "bytestream.h"
  28 #include "codec_internal.h"
  29 #include "decode.h"
  30 #include "xwd.h"
  31
  32 static int xwd_decode_frame(AVCodecContext *avctx, AVFrame *p,
  33                             int *got_frame, AVPacket *avpkt)
  34 {
  35     uint32_t version, header_size, vclass, ncolors;
  36     uint32_t xoffset, be, bpp, lsize, rsize;
  37     uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
  38     uint32_t rgb[3];
  39     uint8_t *ptr;
  40     int width, height;
  41     GetByteContext gb;
  42     int ret;
  43
  44     if (avpkt->size < XWD_HEADER_SIZE)
  45         return AVERROR_INVALIDDATA;
  46
  47     bytestream2_init(&gb, avpkt->data, avpkt->size);
  48     header_size = bytestream2_get_be32u(&gb);
  49
  50     version = bytestream2_get_be32u(&gb);
  51     if (version != XWD_VERSION) {
  52         av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
  53         return AVERROR_INVALIDDATA;
  54     }
  55
  56     if (avpkt->size < header_size || header_size < XWD_HEADER_SIZE) {
  57         av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
  58         return AVERROR_INVALIDDATA;
  59     }
  60
  61     pixformat     = bytestream2_get_be32u(&gb);
  62     pixdepth      = bytestream2_get_be32u(&gb);
  63     width         = bytestream2_get_be32u(&gb);
  64     height        = bytestream2_get_be32u(&gb);
  65     xoffset       = bytestream2_get_be32u(&gb);
  66     be            = bytestream2_get_be32u(&gb);
  67     bunit         = bytestream2_get_be32u(&gb);
  68     bitorder      = bytestream2_get_be32u(&gb);
  69     bpad          = bytestream2_get_be32u(&gb);
  70     bpp           = bytestream2_get_be32u(&gb);
  71     lsize         = bytestream2_get_be32u(&gb);
  72     vclass        = bytestream2_get_be32u(&gb);
  73     rgb[0]        = bytestream2_get_be32u(&gb);
  74     rgb[1]        = bytestream2_get_be32u(&gb);
  75     rgb[2]        = bytestream2_get_be32u(&gb);
  76     bytestream2_skipu(&gb, 8);
  77     ncolors       = bytestream2_get_be32u(&gb);
  78     bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
  79
  80     if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
  81         return ret;
  82
  83     av_log(avctx, AV_LOG_DEBUG,
  84            "pixformat %"PRIu32", pixdepth %"PRIu32", bunit %"PRIu32", bitorder %"PRIu32", bpad %"PRIu32"\n",
  85            pixformat, pixdepth, bunit, bitorder, bpad);
  86     av_log(avctx, AV_LOG_DEBUG,
  87            "vclass %"PRIu32", ncolors %"PRIu32", bpp %"PRIu32", be %"PRIu32", lsize %"PRIu32", xoffset %"PRIu32"\n",
  88            vclass, ncolors, bpp, be, lsize, xoffset);
  89     av_log(avctx, AV_LOG_DEBUG,
  90            "red %0"PRIx32", green %0"PRIx32", blue %0"PRIx32"\n",
  91            rgb[0], rgb[1], rgb[2]);
  92
  93     if (pixformat > XWD_Z_PIXMAP) {
  94         av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");
  95         return AVERROR_INVALIDDATA;
  96     }
  97
  98     if (pixdepth == 0 || pixdepth > 32) {
  99         av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");
 100         return AVERROR_INVALIDDATA;
 101     }
 102
 103     if (xoffset) {
 104         avpriv_request_sample(avctx, "xoffset %"PRIu32"", xoffset);
 105         return AVERROR_PATCHWELCOME;
 106     }
 107
 108     if (be > 1) {
 109         av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");
 110         return AVERROR_INVALIDDATA;
 111     }
 112
 113     if (bitorder > 1) {
 114         av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");
 115         return AVERROR_INVALIDDATA;
 116     }
 117
 118     if (bunit != 8 && bunit != 16 && bunit != 32) {
 119         av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");
 120         return AVERROR_INVALIDDATA;
 121     }
 122
 123     if (bpad != 8 && bpad != 16 && bpad != 32) {
 124         av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");
 125         return AVERROR_INVALIDDATA;
 126     }
 127
 128     if (bpp == 0 || bpp > 32) {
 129         av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");
 130         return AVERROR_INVALIDDATA;
 131     }
 132
 133     if (ncolors > 256) {
 134         av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");
 135         return AVERROR_INVALIDDATA;
 136     }
 137
 138     if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)
 139         return ret;
 140
 141     rsize = FFALIGN(avctx->width * bpp, bpad) / 8;
 142     if (lsize < rsize) {
 143         av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");
 144         return AVERROR_INVALIDDATA;
 145     }
 146
 147     if (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + (uint64_t)avctx->height * lsize) {
 148         av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
 149         return AVERROR_INVALIDDATA;
 150     }
 151
 152     if (pixformat != XWD_Z_PIXMAP) {
 153         avpriv_report_missing_feature(avctx, "Pixmap format %"PRIu32, pixformat);
 154         return AVERROR_PATCHWELCOME;
 155     }
 156
 157     avctx->pix_fmt = AV_PIX_FMT_NONE;
 158     switch (vclass) {
 159     case XWD_STATIC_GRAY:
 160     case XWD_GRAY_SCALE:
 161         if (bpp != 1 && bpp != 8)
 162             return AVERROR_INVALIDDATA;
 163         if (bpp == 1 && pixdepth == 1) {
 164             avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
 165         } else if (bpp == 8 && pixdepth == 8) {
 166             avctx->pix_fmt = AV_PIX_FMT_GRAY8;
 167         }
 168         break;
 169     case XWD_STATIC_COLOR:
 170     case XWD_PSEUDO_COLOR:
 171         if (bpp == 8)
 172             avctx->pix_fmt = AV_PIX_FMT_PAL8;
 173         break;
 174     case XWD_TRUE_COLOR:
 175     case XWD_DIRECT_COLOR:
 176         if (bpp != 16 && bpp != 24 && bpp != 32)
 177             return AVERROR_INVALIDDATA;
 178         if (bpp == 16 && pixdepth == 15) {
 179             if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)
 180                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB555BE : AV_PIX_FMT_RGB555LE;
 181             else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)
 182                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR555BE : AV_PIX_FMT_BGR555LE;
 183         } else if (bpp == 16 && pixdepth == 16) {
 184             if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)
 185                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB565BE : AV_PIX_FMT_RGB565LE;
 186             else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)
 187                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR565BE : AV_PIX_FMT_BGR565LE;
 188         } else if (bpp == 24) {
 189             if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
 190                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
 191             else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
 192                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;
 193         } else if (bpp == 32) {
 194             if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
 195                 avctx->pix_fmt = be ? AV_PIX_FMT_ARGB : AV_PIX_FMT_BGRA;
 196             else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
 197                 avctx->pix_fmt = be ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA;
 198         }
 199         bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);
 200         break;
 201     default:
 202         av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
 203         return AVERROR_INVALIDDATA;
 204     }
 205
 206     if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
 207         avpriv_request_sample(avctx,
 208                               "Unknown file: bpp %"PRIu32", pixdepth %"PRIu32", vclass %"PRIu32"",
 209                               bpp, pixdepth, vclass);
 210         return AVERROR_PATCHWELCOME;
 211     }
 212
 213     if (avctx->skip_frame >= AVDISCARD_ALL)
 214         return avpkt->size;
 215
 216     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
 217         return ret;
 218
 219     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
 220         uint32_t *dst = (uint32_t *)p->data[1];
 221         uint8_t red, green, blue;
 222
 223         for (int i = 0; i < ncolors; i++) {
 224             bytestream2_skipu(&gb, 4); // skip colormap entry number
 225             red    = bytestream2_get_byteu(&gb);
 226             bytestream2_skipu(&gb, 1);
 227             green  = bytestream2_get_byteu(&gb);
 228             bytestream2_skipu(&gb, 1);
 229             blue   = bytestream2_get_byteu(&gb);
 230             bytestream2_skipu(&gb, 3); // skip bitmask flag and padding
 231
 232             dst[i] = 0xFFU << 24 | red << 16 | green << 8 | blue;
 233         }
 234     }
 235
 236     ptr = p->data[0];
 237     for (int i = 0; i < avctx->height; i++) {
 238         bytestream2_get_bufferu(&gb, ptr, rsize);
 239         bytestream2_skipu(&gb, lsize - rsize);
 240         ptr += p->linesize[0];
 241     }
 242
 243     *got_frame       = 1;
 244
 245     return avpkt->size;
 246 }
 247
 248 const FFCodec ff_xwd_decoder = {
 249     .p.name         = "xwd",
 250     CODEC_LONG_NAME("XWD (X Window Dump) image"),
 251     .p.type         = AVMEDIA_TYPE_VIDEO,
 252     .p.id           = AV_CODEC_ID_XWD,
 253     .p.capabilities = AV_CODEC_CAP_DR1,
 254     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
 255     FF_CODEC_DECODE_CB(xwd_decode_frame),
 256 };