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 "internal.h"
30 #include "xwd.h"
31
xwd_decode_frame(AVCodecContext * avctx,AVFrame * p,int * got_frame,AVPacket * avpkt)32 static int xwd_decode_frame(AVCodecContext *avctx, AVFrame *p,
33 int *got_frame, AVPacket *avpkt)
34 {
35 const uint8_t *buf = avpkt->data;
36 int i, ret, buf_size = avpkt->size;
37 uint32_t version, header_size, vclass, ncolors;
38 uint32_t xoffset, be, bpp, lsize, rsize;
39 uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
40 uint32_t rgb[3];
41 uint8_t *ptr;
42 int width, height;
43 GetByteContext gb;
44
45 if (buf_size < XWD_HEADER_SIZE)
46 return AVERROR_INVALIDDATA;
47
48 bytestream2_init(&gb, buf, buf_size);
49 header_size = bytestream2_get_be32u(&gb);
50
51 version = bytestream2_get_be32u(&gb);
52 if (version != XWD_VERSION) {
53 av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
54 return AVERROR_INVALIDDATA;
55 }
56
57 if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {
58 av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
59 return AVERROR_INVALIDDATA;
60 }
61
62 pixformat = bytestream2_get_be32u(&gb);
63 pixdepth = bytestream2_get_be32u(&gb);
64 width = bytestream2_get_be32u(&gb);
65 height = bytestream2_get_be32u(&gb);
66 xoffset = bytestream2_get_be32u(&gb);
67 be = bytestream2_get_be32u(&gb);
68 bunit = bytestream2_get_be32u(&gb);
69 bitorder = bytestream2_get_be32u(&gb);
70 bpad = bytestream2_get_be32u(&gb);
71 bpp = bytestream2_get_be32u(&gb);
72 lsize = bytestream2_get_be32u(&gb);
73 vclass = bytestream2_get_be32u(&gb);
74 rgb[0] = bytestream2_get_be32u(&gb);
75 rgb[1] = bytestream2_get_be32u(&gb);
76 rgb[2] = bytestream2_get_be32u(&gb);
77 bytestream2_skipu(&gb, 8);
78 ncolors = bytestream2_get_be32u(&gb);
79 bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
80
81 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
82 return ret;
83
84 av_log(avctx, AV_LOG_DEBUG,
85 "pixformat %"PRIu32", pixdepth %"PRIu32", bunit %"PRIu32", bitorder %"PRIu32", bpad %"PRIu32"\n",
86 pixformat, pixdepth, bunit, bitorder, bpad);
87 av_log(avctx, AV_LOG_DEBUG,
88 "vclass %"PRIu32", ncolors %"PRIu32", bpp %"PRIu32", be %"PRIu32", lsize %"PRIu32", xoffset %"PRIu32"\n",
89 vclass, ncolors, bpp, be, lsize, xoffset);
90 av_log(avctx, AV_LOG_DEBUG,
91 "red %0"PRIx32", green %0"PRIx32", blue %0"PRIx32"\n",
92 rgb[0], rgb[1], rgb[2]);
93
94 if (pixformat > XWD_Z_PIXMAP) {
95 av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");
96 return AVERROR_INVALIDDATA;
97 }
98
99 if (pixdepth == 0 || pixdepth > 32) {
100 av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");
101 return AVERROR_INVALIDDATA;
102 }
103
104 if (xoffset) {
105 avpriv_request_sample(avctx, "xoffset %"PRIu32"", xoffset);
106 return AVERROR_PATCHWELCOME;
107 }
108
109 if (be > 1) {
110 av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");
111 return AVERROR_INVALIDDATA;
112 }
113
114 if (bitorder > 1) {
115 av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");
116 return AVERROR_INVALIDDATA;
117 }
118
119 if (bunit != 8 && bunit != 16 && bunit != 32) {
120 av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");
121 return AVERROR_INVALIDDATA;
122 }
123
124 if (bpad != 8 && bpad != 16 && bpad != 32) {
125 av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");
126 return AVERROR_INVALIDDATA;
127 }
128
129 if (bpp == 0 || bpp > 32) {
130 av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");
131 return AVERROR_INVALIDDATA;
132 }
133
134 if (ncolors > 256) {
135 av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");
136 return AVERROR_INVALIDDATA;
137 }
138
139 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)
140 return ret;
141
142 rsize = FFALIGN(avctx->width * bpp, bpad) / 8;
143 if (lsize < rsize) {
144 av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");
145 return AVERROR_INVALIDDATA;
146 }
147
148 if (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + (uint64_t)avctx->height * lsize) {
149 av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
150 return AVERROR_INVALIDDATA;
151 }
152
153 if (pixformat != XWD_Z_PIXMAP) {
154 avpriv_report_missing_feature(avctx, "Pixmap format %"PRIu32, pixformat);
155 return AVERROR_PATCHWELCOME;
156 }
157
158 avctx->pix_fmt = AV_PIX_FMT_NONE;
159 switch (vclass) {
160 case XWD_STATIC_GRAY:
161 case XWD_GRAY_SCALE:
162 if (bpp != 1 && bpp != 8)
163 return AVERROR_INVALIDDATA;
164 if (bpp == 1 && pixdepth == 1) {
165 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
166 } else if (bpp == 8 && pixdepth == 8) {
167 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
168 }
169 break;
170 case XWD_STATIC_COLOR:
171 case XWD_PSEUDO_COLOR:
172 if (bpp == 8)
173 avctx->pix_fmt = AV_PIX_FMT_PAL8;
174 break;
175 case XWD_TRUE_COLOR:
176 case XWD_DIRECT_COLOR:
177 if (bpp != 16 && bpp != 24 && bpp != 32)
178 return AVERROR_INVALIDDATA;
179 if (bpp == 16 && pixdepth == 15) {
180 if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)
181 avctx->pix_fmt = be ? AV_PIX_FMT_RGB555BE : AV_PIX_FMT_RGB555LE;
182 else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)
183 avctx->pix_fmt = be ? AV_PIX_FMT_BGR555BE : AV_PIX_FMT_BGR555LE;
184 } else if (bpp == 16 && pixdepth == 16) {
185 if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)
186 avctx->pix_fmt = be ? AV_PIX_FMT_RGB565BE : AV_PIX_FMT_RGB565LE;
187 else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)
188 avctx->pix_fmt = be ? AV_PIX_FMT_BGR565BE : AV_PIX_FMT_BGR565LE;
189 } else if (bpp == 24) {
190 if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
191 avctx->pix_fmt = be ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
192 else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
193 avctx->pix_fmt = be ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;
194 } else if (bpp == 32) {
195 if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
196 avctx->pix_fmt = be ? AV_PIX_FMT_ARGB : AV_PIX_FMT_BGRA;
197 else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
198 avctx->pix_fmt = be ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA;
199 }
200 bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);
201 break;
202 default:
203 av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
204 return AVERROR_INVALIDDATA;
205 }
206
207 if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
208 avpriv_request_sample(avctx,
209 "Unknown file: bpp %"PRIu32", pixdepth %"PRIu32", vclass %"PRIu32"",
210 bpp, pixdepth, vclass);
211 return AVERROR_PATCHWELCOME;
212 }
213
214 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
215 return ret;
216
217 p->key_frame = 1;
218 p->pict_type = AV_PICTURE_TYPE_I;
219
220 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
221 uint32_t *dst = (uint32_t *)p->data[1];
222 uint8_t red, green, blue;
223
224 for (i = 0; i < ncolors; i++) {
225
226 bytestream2_skipu(&gb, 4); // skip colormap entry number
227 red = bytestream2_get_byteu(&gb);
228 bytestream2_skipu(&gb, 1);
229 green = bytestream2_get_byteu(&gb);
230 bytestream2_skipu(&gb, 1);
231 blue = bytestream2_get_byteu(&gb);
232 bytestream2_skipu(&gb, 3); // skip bitmask flag and padding
233
234 dst[i] = 0xFFU << 24 | red << 16 | green << 8 | blue;
235 }
236 }
237
238 ptr = p->data[0];
239 for (i = 0; i < avctx->height; i++) {
240 bytestream2_get_bufferu(&gb, ptr, rsize);
241 bytestream2_skipu(&gb, lsize - rsize);
242 ptr += p->linesize[0];
243 }
244
245 *got_frame = 1;
246
247 return buf_size;
248 }
249
250 const FFCodec ff_xwd_decoder = {
251 .p.name = "xwd",
252 .p.long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
253 .p.type = AVMEDIA_TYPE_VIDEO,
254 .p.id = AV_CODEC_ID_XWD,
255 .p.capabilities = AV_CODEC_CAP_DR1,
256 FF_CODEC_DECODE_CB(xwd_decode_frame),
257 };
258