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xwddec.c
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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 "libavutil/imgutils.h"
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "internal.h"
27 #include "xwd.h"
28 
29 static av_cold int xwd_decode_init(AVCodecContext *avctx)
30 {
31  avctx->coded_frame = avcodec_alloc_frame();
32  if (!avctx->coded_frame)
33  return AVERROR(ENOMEM);
34 
35  return 0;
36 }
37 
38 static int xwd_decode_frame(AVCodecContext *avctx, void *data,
39  int *got_frame, AVPacket *avpkt)
40 {
41  AVFrame *p = avctx->coded_frame;
42  const uint8_t *buf = avpkt->data;
43  int i, ret, buf_size = avpkt->size;
44  uint32_t version, header_size, vclass, ncolors;
45  uint32_t xoffset, be, bpp, lsize, rsize;
46  uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
47  uint32_t rgb[3];
48  uint8_t *ptr;
49  GetByteContext gb;
50 
51  if (buf_size < XWD_HEADER_SIZE)
52  return AVERROR_INVALIDDATA;
53 
54  bytestream2_init(&gb, buf, buf_size);
55  header_size = bytestream2_get_be32u(&gb);
56 
57  version = bytestream2_get_be32u(&gb);
58  if (version != XWD_VERSION) {
59  av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
60  return AVERROR_INVALIDDATA;
61  }
62 
63  if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {
64  av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
65  return AVERROR_INVALIDDATA;
66  }
67 
68  pixformat = bytestream2_get_be32u(&gb);
69  pixdepth = bytestream2_get_be32u(&gb);
70  avctx->width = bytestream2_get_be32u(&gb);
71  avctx->height = bytestream2_get_be32u(&gb);
72  xoffset = bytestream2_get_be32u(&gb);
73  be = bytestream2_get_be32u(&gb);
74  bunit = bytestream2_get_be32u(&gb);
75  bitorder = bytestream2_get_be32u(&gb);
76  bpad = bytestream2_get_be32u(&gb);
77  bpp = bytestream2_get_be32u(&gb);
78  lsize = bytestream2_get_be32u(&gb);
79  vclass = bytestream2_get_be32u(&gb);
80  rgb[0] = bytestream2_get_be32u(&gb);
81  rgb[1] = bytestream2_get_be32u(&gb);
82  rgb[2] = bytestream2_get_be32u(&gb);
83  bytestream2_skipu(&gb, 8);
84  ncolors = bytestream2_get_be32u(&gb);
85  bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
86 
87  av_log(avctx, AV_LOG_DEBUG, "pixformat %d, pixdepth %d, bunit %d, bitorder %d, bpad %d\n",
88  pixformat, pixdepth, bunit, bitorder, bpad);
89  av_log(avctx, AV_LOG_DEBUG, "vclass %d, ncolors %d, bpp %d, be %d, lsize %d, xoffset %d\n",
90  vclass, ncolors, bpp, be, lsize, xoffset);
91  av_log(avctx, AV_LOG_DEBUG, "red %0x, green %0x, blue %0x\n", 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  av_log_ask_for_sample(avctx, "unsupported xoffset %d\n", 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 + 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  av_log(avctx, AV_LOG_ERROR, "pixmap format %d unsupported\n", 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 (pixdepth == 1) {
164  avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
165  } else if (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  av_log_ask_for_sample(avctx, "unknown file: bpp %d, pixdepth %d, vclass %d\n", bpp, pixdepth, vclass);
208  return AVERROR_PATCHWELCOME;
209  }
210 
211  if (p->data[0])
212  avctx->release_buffer(avctx, p);
213 
214  p->reference = 0;
215  if ((ret = ff_get_buffer(avctx, p)) < 0) {
216  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
217  return ret;
218  }
219 
220  p->key_frame = 1;
221  p->pict_type = AV_PICTURE_TYPE_I;
222 
223  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
224  uint32_t *dst = (uint32_t *)p->data[1];
225  uint8_t red, green, blue;
226 
227  for (i = 0; i < ncolors; i++) {
228 
229  bytestream2_skipu(&gb, 4); // skip colormap entry number
230  red = bytestream2_get_byteu(&gb);
231  bytestream2_skipu(&gb, 1);
232  green = bytestream2_get_byteu(&gb);
233  bytestream2_skipu(&gb, 1);
234  blue = bytestream2_get_byteu(&gb);
235  bytestream2_skipu(&gb, 3); // skip bitmask flag and padding
236 
237  dst[i] = red << 16 | green << 8 | blue;
238  }
239  }
240 
241  ptr = p->data[0];
242  for (i = 0; i < avctx->height; i++) {
243  bytestream2_get_bufferu(&gb, ptr, rsize);
244  bytestream2_skipu(&gb, lsize - rsize);
245  ptr += p->linesize[0];
246  }
247 
248  *got_frame = 1;
249  *(AVFrame *)data = *p;
250 
251  return buf_size;
252 }
253 
254 static av_cold int xwd_decode_close(AVCodecContext *avctx)
255 {
256  if (avctx->coded_frame->data[0])
257  avctx->release_buffer(avctx, avctx->coded_frame);
258 
259  av_freep(&avctx->coded_frame);
260 
261  return 0;
262 }
263 
264 AVCodec ff_xwd_decoder = {
265  .name = "xwd",
266  .type = AVMEDIA_TYPE_VIDEO,
267  .id = AV_CODEC_ID_XWD,
268  .init = xwd_decode_init,
269  .close = xwd_decode_close,
270  .decode = xwd_decode_frame,
271  .capabilities = CODEC_CAP_DR1,
272  .long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
273 };
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