FFmpeg: libavcodec/xwddec.c Source File

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libavcodec

xwddec.c

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1 /*

2 * XWD image format

3 *

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 */

23 #include "libavutil/imgutils.h"

24 #include "avcodec.h"

25 #include "bytestream.h"

26 #include "internal.h"

27 #include "xwd.h"

29 static int xwd_decode_frame(AVCodecContext *avctx, void *data,

30 int *got_frame, AVPacket *avpkt)

31 {

32 AVFrame *p = data;

33 const uint8_t *buf = avpkt->data;

34 int i, ret, buf_size = avpkt->size;

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 GetByteContext gb;

42 if (buf_size < XWD_HEADER_SIZE)

43 return AVERROR_INVALIDDATA;

45 bytestream2_init(&gb, buf, buf_size);

46 header_size = bytestream2_get_be32u(&gb);

48 version = bytestream2_get_be32u(&gb);

49 if (version != XWD_VERSION) {

50 av_log(avctx, AV_LOG_ERROR, "unsupported version\n");

51 return AVERROR_INVALIDDATA;

52 }

54 if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {

55 av_log(avctx, AV_LOG_ERROR, "invalid header size\n");

56 return AVERROR_INVALIDDATA;

57 }

59 pixformat = bytestream2_get_be32u(&gb);

60 pixdepth = bytestream2_get_be32u(&gb);

61 avctx->width = bytestream2_get_be32u(&gb);

62 avctx->height = bytestream2_get_be32u(&gb);

63 xoffset = bytestream2_get_be32u(&gb);

64 be = bytestream2_get_be32u(&gb);

65 bunit = bytestream2_get_be32u(&gb);

66 bitorder = bytestream2_get_be32u(&gb);

67 bpad = bytestream2_get_be32u(&gb);

68 bpp = bytestream2_get_be32u(&gb);

69 lsize = bytestream2_get_be32u(&gb);

70 vclass = bytestream2_get_be32u(&gb);

71 rgb[0] = bytestream2_get_be32u(&gb);

72 rgb[1] = bytestream2_get_be32u(&gb);

73 rgb[2] = bytestream2_get_be32u(&gb);

74 bytestream2_skipu(&gb, 8);

75 ncolors = bytestream2_get_be32u(&gb);

76 bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));

78 av_log(avctx, AV_LOG_DEBUG, "pixformat %d, pixdepth %d, bunit %d, bitorder %d, bpad %d\n",

79 pixformat, pixdepth, bunit, bitorder, bpad);

80 av_log(avctx, AV_LOG_DEBUG, "vclass %d, ncolors %d, bpp %d, be %d, lsize %d, xoffset %d\n",

81 vclass, ncolors, bpp, be, lsize, xoffset);

82 av_log(avctx, AV_LOG_DEBUG, "red %0x, green %0x, blue %0x\n", rgb[0], rgb[1], rgb[2]);

84 if (pixformat > XWD_Z_PIXMAP) {

85 av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");

86 return AVERROR_INVALIDDATA;

87 }

89 if (pixdepth == 0 || pixdepth > 32) {

90 av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");

91 return AVERROR_INVALIDDATA;

92 }

94 if (xoffset) {

95 avpriv_request_sample(avctx, "xoffset %d", xoffset);

96 return AVERROR_PATCHWELCOME;

97 }

99 if (be > 1) {

100 av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");

101 return AVERROR_INVALIDDATA;

102 }

103

104 if (bitorder > 1) {

105 av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");

106 return AVERROR_INVALIDDATA;

107 }

108

109 if (bunit != 8 && bunit != 16 && bunit != 32) {

110 av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");

111 return AVERROR_INVALIDDATA;

112 }

113

114 if (bpad != 8 && bpad != 16 && bpad != 32) {

115 av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");

116 return AVERROR_INVALIDDATA;

117 }

118

119 if (bpp == 0 || bpp > 32) {

120 av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");

121 return AVERROR_INVALIDDATA;

122 }

123

124 if (ncolors > 256) {

125 av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");

126 return AVERROR_INVALIDDATA;

127 }

128

129 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)

130 return ret;

131

132 rsize = FFALIGN(avctx->width * bpp, bpad) / 8;

133 if (lsize < rsize) {

134 av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");

135 return AVERROR_INVALIDDATA;

136 }

137

138 if (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + avctx->height * lsize) {

139 av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");

140 return AVERROR_INVALIDDATA;

141 }

142

143 if (pixformat != XWD_Z_PIXMAP) {

144 av_log(avctx, AV_LOG_ERROR, "pixmap format %d unsupported\n", pixformat);

145 return AVERROR_PATCHWELCOME;

146 }

147

148 avctx->pix_fmt = AV_PIX_FMT_NONE;

149 switch (vclass) {

150 case XWD_STATIC_GRAY:

151 case XWD_GRAY_SCALE:

152 if (bpp != 1 && bpp != 8)

153 return AVERROR_INVALIDDATA;

154 if (pixdepth == 1) {

155 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;

156 } else if (pixdepth == 8) {

157 avctx->pix_fmt = AV_PIX_FMT_GRAY8;

158 }

159 break;

160 case XWD_STATIC_COLOR:

161 case XWD_PSEUDO_COLOR:

162 if (bpp == 8)

163 avctx->pix_fmt = AV_PIX_FMT_PAL8;

164 break;

165 case XWD_TRUE_COLOR:

166 case XWD_DIRECT_COLOR:

167 if (bpp != 16 && bpp != 24 && bpp != 32)

168 return AVERROR_INVALIDDATA;

169 if (bpp == 16 && pixdepth == 15) {

170 if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)

171 avctx->pix_fmt = be ? AV_PIX_FMT_RGB555BE : AV_PIX_FMT_RGB555LE;

172 else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)

173 avctx->pix_fmt = be ? AV_PIX_FMT_BGR555BE : AV_PIX_FMT_BGR555LE;

174 } else if (bpp == 16 && pixdepth == 16) {

175 if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)

176 avctx->pix_fmt = be ? AV_PIX_FMT_RGB565BE : AV_PIX_FMT_RGB565LE;

177 else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)

178 avctx->pix_fmt = be ? AV_PIX_FMT_BGR565BE : AV_PIX_FMT_BGR565LE;

179 } else if (bpp == 24) {

180 if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)

181 avctx->pix_fmt = be ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;

182 else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)

183 avctx->pix_fmt = be ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;

184 } else if (bpp == 32) {

185 if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)

186 avctx->pix_fmt = be ? AV_PIX_FMT_ARGB : AV_PIX_FMT_BGRA;

187 else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)

188 avctx->pix_fmt = be ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA;

189 }

190 bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);

191 break;

192 default:

193 av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");

194 return AVERROR_INVALIDDATA;

195 }

196

197 if (avctx->pix_fmt == AV_PIX_FMT_NONE) {

198 avpriv_request_sample(avctx,

199 "Unknown file: bpp %d, pixdepth %d, vclass %d",

200 bpp, pixdepth, vclass);

201 return AVERROR_PATCHWELCOME;

202 }

203

204 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

205 return ret;

206

207 p->key_frame = 1;

208 p->pict_type = AV_PICTURE_TYPE_I;

209

210 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

211 uint32_t *dst = (uint32_t *)p->data[1];

212 uint8_t red, green, blue;

213

214 for (i = 0; i < ncolors; i++) {

215

216 bytestream2_skipu(&gb, 4); // skip colormap entry number

217 red = bytestream2_get_byteu(&gb);

218 bytestream2_skipu(&gb, 1);

219 green = bytestream2_get_byteu(&gb);

220 bytestream2_skipu(&gb, 1);

221 blue = bytestream2_get_byteu(&gb);

222 bytestream2_skipu(&gb, 3); // skip bitmask flag and padding

223

224 dst[i] = red << 16 | green << 8 | blue;

225 }

226 }

227

228 ptr = p->data[0];

229 for (i = 0; i < avctx->height; i++) {

230 bytestream2_get_bufferu(&gb, ptr, rsize);

231 bytestream2_skipu(&gb, lsize - rsize);

232 ptr += p->linesize[0];

233 }

234

235 *got_frame = 1;

236

237 return buf_size;

238 }

239

240 AVCodec ff_xwd_decoder = {

241 .name = "xwd",

242 .type = AVMEDIA_TYPE_VIDEO,

243 .id = AV_CODEC_ID_XWD,

244 .decode = xwd_decode_frame,

245 .capabilities = CODEC_CAP_DR1,

246 .long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),

247 };

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