FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dds.c
Date: 2026-04-28 19:09:24
Exec Total Coverage
Lines: 325 417 77.9%
Functions: 4 4 100.0%
Branches: 173 286 60.5%
Line Branch Exec Source
1 /*
2 * DirectDraw Surface image decoder
3 * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * DDS decoder
25 *
26 * https://msdn.microsoft.com/en-us/library/bb943982%28v=vs.85%29.aspx
27 */
28
29 #include <stdint.h>
30
31 #include "libavutil/attributes.h"
32 #include "libavutil/libm.h"
33 #include "libavutil/imgutils.h"
34
35 #include "avcodec.h"
36 #include "bytestream.h"
37 #include "codec_internal.h"
38 #include "decode.h"
39 #include "texturedsp.h"
40
41 #define DDPF_FOURCC (1 << 2)
42 #define DDPF_PALETTE (1 << 5)
43 #define DDPF_NORMALMAP (1U << 31)
44
45 enum DDSPostProc {
46 DDS_NONE = 0,
47 DDS_ALPHA_EXP,
48 DDS_NORMAL_MAP,
49 DDS_RAW_YCOCG,
50 DDS_SWAP_ALPHA,
51 DDS_SWIZZLE_A2XY,
52 DDS_SWIZZLE_RBXG,
53 DDS_SWIZZLE_RGXB,
54 DDS_SWIZZLE_RXBG,
55 DDS_SWIZZLE_RXGB,
56 DDS_SWIZZLE_XGBR,
57 DDS_SWIZZLE_XRBG,
58 DDS_SWIZZLE_XGXR,
59 };
60
61 enum DDSDXGIFormat {
62 DXGI_FORMAT_R16G16B16A16_TYPELESS = 9,
63 DXGI_FORMAT_R16G16B16A16_FLOAT = 10,
64 DXGI_FORMAT_R16G16B16A16_UNORM = 11,
65 DXGI_FORMAT_R16G16B16A16_UINT = 12,
66 DXGI_FORMAT_R16G16B16A16_SNORM = 13,
67 DXGI_FORMAT_R16G16B16A16_SINT = 14,
68
69 DXGI_FORMAT_R8G8B8A8_TYPELESS = 27,
70 DXGI_FORMAT_R8G8B8A8_UNORM = 28,
71 DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29,
72 DXGI_FORMAT_R8G8B8A8_UINT = 30,
73 DXGI_FORMAT_R8G8B8A8_SNORM = 31,
74 DXGI_FORMAT_R8G8B8A8_SINT = 32,
75
76 DXGI_FORMAT_BC1_TYPELESS = 70,
77 DXGI_FORMAT_BC1_UNORM = 71,
78 DXGI_FORMAT_BC1_UNORM_SRGB = 72,
79 DXGI_FORMAT_BC2_TYPELESS = 73,
80 DXGI_FORMAT_BC2_UNORM = 74,
81 DXGI_FORMAT_BC2_UNORM_SRGB = 75,
82 DXGI_FORMAT_BC3_TYPELESS = 76,
83 DXGI_FORMAT_BC3_UNORM = 77,
84 DXGI_FORMAT_BC3_UNORM_SRGB = 78,
85 DXGI_FORMAT_BC4_TYPELESS = 79,
86 DXGI_FORMAT_BC4_UNORM = 80,
87 DXGI_FORMAT_BC4_SNORM = 81,
88 DXGI_FORMAT_BC5_TYPELESS = 82,
89 DXGI_FORMAT_BC5_UNORM = 83,
90 DXGI_FORMAT_BC5_SNORM = 84,
91 DXGI_FORMAT_B5G6R5_UNORM = 85,
92 DXGI_FORMAT_B8G8R8A8_UNORM = 87,
93 DXGI_FORMAT_B8G8R8X8_UNORM = 88,
94 DXGI_FORMAT_B8G8R8A8_TYPELESS = 90,
95 DXGI_FORMAT_B8G8R8A8_UNORM_SRGB = 91,
96 DXGI_FORMAT_B8G8R8X8_TYPELESS = 92,
97 DXGI_FORMAT_B8G8R8X8_UNORM_SRGB = 93,
98 };
99
100 typedef struct DDSContext {
101 TextureDSPContext texdsp;
102 GetByteContext gbc;
103
104 int compressed;
105 int paletted;
106 int bpp;
107 enum DDSPostProc postproc;
108
109 TextureDSPThreadContext dec;
110 } DDSContext;
111
112 96 static int parse_pixel_format(AVCodecContext *avctx)
113 {
114 96 DDSContext *ctx = avctx->priv_data;
115 96 GetByteContext *gbc = &ctx->gbc;
116 uint32_t flags, fourcc, gimp_tag;
117 enum DDSDXGIFormat dxgi;
118 int size, bpp, r, g, b, a;
119 int alpha_exponent, ycocg_classic, ycocg_scaled, normal_map, array;
120
121 /* Alternative DDS implementations use reserved1 as custom header. */
122 96 bytestream2_skip(gbc, 4 * 3);
123 96 gimp_tag = bytestream2_get_le32(gbc);
124 96 alpha_exponent = gimp_tag == MKTAG('A', 'E', 'X', 'P');
125 96 ycocg_classic = gimp_tag == MKTAG('Y', 'C', 'G', '1');
126 96 ycocg_scaled = gimp_tag == MKTAG('Y', 'C', 'G', '2');
127 96 bytestream2_skip(gbc, 4 * 7);
128
129 /* Now the real DDPF starts. */
130 96 size = bytestream2_get_le32(gbc);
131
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 96 if (size != 32) {
132 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
133 ✗ return AVERROR_INVALIDDATA;
134 }
135 96 flags = bytestream2_get_le32(gbc);
136 96 ctx->compressed = flags & DDPF_FOURCC;
137 96 ctx->paletted = flags & DDPF_PALETTE;
138 96 normal_map = flags & DDPF_NORMALMAP;
139 96 fourcc = bytestream2_get_le32(gbc);
140
141
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 96 if (ctx->compressed && ctx->paletted) {
142 ✗ av_log(avctx, AV_LOG_WARNING,
143 "Disabling invalid palette flag for compressed dds.\n");
144 ✗ ctx->paletted = 0;
145 }
146
147 96 bpp = ctx->bpp = bytestream2_get_le32(gbc); // rgbbitcount
148 96 r = bytestream2_get_le32(gbc); // rbitmask
149 96 g = bytestream2_get_le32(gbc); // gbitmask
150 96 b = bytestream2_get_le32(gbc); // bbitmask
151 96 a = bytestream2_get_le32(gbc); // abitmask
152
153 96 bytestream2_skip(gbc, 4); // caps
154 96 bytestream2_skip(gbc, 4); // caps2
155 96 bytestream2_skip(gbc, 4); // caps3
156 96 bytestream2_skip(gbc, 4); // caps4
157 96 bytestream2_skip(gbc, 4); // reserved2
158
159 96 av_log(avctx, AV_LOG_VERBOSE, "fourcc %s bpp %d "
160 96 "r 0x%x g 0x%x b 0x%x a 0x%x\n", av_fourcc2str(fourcc), bpp, r, g, b, a);
161
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 96 if (gimp_tag)
162 10 av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", av_fourcc2str(gimp_tag));
163
164
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 96 if (ctx->compressed)
165 68 avctx->pix_fmt = AV_PIX_FMT_RGBA;
166
167
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 96 if (ctx->compressed) {
168 68 ctx->dec.raw_ratio = 16;
169
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 68 switch (fourcc) {
170 6 case MKTAG('D', 'X', 'T', '1'):
171 6 ctx->dec.tex_ratio = 8;
172 6 ctx->dec.tex_funct = ctx->texdsp.dxt1a_block;
173 68 break;
174 2 case MKTAG('D', 'X', 'T', '2'):
175 2 ctx->dec.tex_ratio = 16;
176 2 ctx->dec.tex_funct = ctx->texdsp.dxt2_block;
177 2 break;
178 2 case MKTAG('D', 'X', 'T', '3'):
179 2 ctx->dec.tex_ratio = 16;
180 2 ctx->dec.tex_funct = ctx->texdsp.dxt3_block;
181 2 break;
182 2 case MKTAG('D', 'X', 'T', '4'):
183 2 ctx->dec.tex_ratio = 16;
184 2 ctx->dec.tex_funct = ctx->texdsp.dxt4_block;
185 2 break;
186 24 case MKTAG('D', 'X', 'T', '5'):
187 24 ctx->dec.tex_ratio = 16;
188
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 24 if (ycocg_scaled)
189 2 ctx->dec.tex_funct = ctx->texdsp.dxt5ys_block;
190
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 22 else if (ycocg_classic)
191 2 ctx->dec.tex_funct = ctx->texdsp.dxt5y_block;
192 else
193 20 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
194 24 break;
195 2 case MKTAG('R', 'X', 'G', 'B'):
196 2 ctx->dec.tex_ratio = 16;
197 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
198 /* This format may be considered as a normal map,
199 * but it is handled differently in a separate postproc. */
200 2 ctx->postproc = DDS_SWIZZLE_RXGB;
201 2 normal_map = 0;
202 2 break;
203 2 case MKTAG('A', 'T', 'I', '1'):
204 case MKTAG('B', 'C', '4', 'U'):
205 2 ctx->dec.tex_ratio = 8;
206 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1u_block;
207 2 break;
208 2 case MKTAG('B', 'C', '4', 'S'):
209 2 ctx->dec.tex_ratio = 8;
210 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1s_block;
211 2 break;
212 4 case MKTAG('A', 'T', 'I', '2'):
213 /* RGT2 variant with swapped R and G (3Dc)*/
214 4 ctx->dec.tex_ratio = 16;
215 4 ctx->dec.tex_funct = ctx->texdsp.dxn3dc_block;
216 4 break;
217 ✗ case MKTAG('B', 'C', '5', 'U'):
218 ✗ ctx->dec.tex_ratio = 16;
219 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc2u_block;
220 ✗ break;
221 2 case MKTAG('B', 'C', '5', 'S'):
222 2 ctx->dec.tex_ratio = 16;
223 2 ctx->dec.tex_funct = ctx->texdsp.rgtc2s_block;
224 2 break;
225 2 case MKTAG('U', 'Y', 'V', 'Y'):
226 2 ctx->compressed = 0;
227 2 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
228 2 break;
229 2 case MKTAG('Y', 'U', 'Y', '2'):
230 2 ctx->compressed = 0;
231 2 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
232 2 break;
233 2 case MKTAG('P', '8', ' ', ' '):
234 /* ATI Palette8, same as normal palette */
235 2 ctx->compressed = 0;
236 2 ctx->paletted = 1;
237 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
238 2 break;
239 2 case MKTAG('G', '1', ' ', ' '):
240 2 ctx->compressed = 0;
241 2 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
242 2 break;
243 12 case MKTAG('D', 'X', '1', '0'):
244 /* DirectX 10 extra header */
245 12 dxgi = bytestream2_get_le32(gbc);
246 12 bytestream2_skip(gbc, 4); // resourceDimension
247 12 bytestream2_skip(gbc, 4); // miscFlag
248 12 array = bytestream2_get_le32(gbc);
249 12 bytestream2_skip(gbc, 4); // miscFlag2
250
251
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 12 if (array != 0)
252 12 av_log(avctx, AV_LOG_VERBOSE,
253 "Found array of size %d (ignored).\n", array);
254
255 /* Only BC[1-5] are actually compressed. */
256
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 12 ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
257
258 12 av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
259
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 12 switch (dxgi) {
260 /* RGB types. */
261 ✗ case DXGI_FORMAT_R16G16B16A16_TYPELESS:
262 case DXGI_FORMAT_R16G16B16A16_FLOAT:
263 case DXGI_FORMAT_R16G16B16A16_UNORM:
264 case DXGI_FORMAT_R16G16B16A16_UINT:
265 case DXGI_FORMAT_R16G16B16A16_SNORM:
266 case DXGI_FORMAT_R16G16B16A16_SINT:
267 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA64;
268 ✗ break;
269 ✗ case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
270 ✗ avctx->colorspace = AVCOL_SPC_RGB;
271 av_fallthrough;
272 ✗ case DXGI_FORMAT_R8G8B8A8_TYPELESS:
273 case DXGI_FORMAT_R8G8B8A8_UNORM:
274 case DXGI_FORMAT_R8G8B8A8_UINT:
275 case DXGI_FORMAT_R8G8B8A8_SNORM:
276 case DXGI_FORMAT_R8G8B8A8_SINT:
277 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA;
278 ✗ break;
279 ✗ case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
280 ✗ avctx->colorspace = AVCOL_SPC_RGB;
281 av_fallthrough;
282 ✗ case DXGI_FORMAT_B8G8R8A8_TYPELESS:
283 case DXGI_FORMAT_B8G8R8A8_UNORM:
284 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
285 ✗ break;
286 ✗ case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
287 ✗ avctx->colorspace = AVCOL_SPC_RGB;
288 av_fallthrough;
289 ✗ case DXGI_FORMAT_B8G8R8X8_TYPELESS:
290 case DXGI_FORMAT_B8G8R8X8_UNORM:
291 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
292 ✗ break;
293 ✗ case DXGI_FORMAT_B5G6R5_UNORM:
294 ✗ avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
295 ✗ break;
296 /* Texture types. */
297 ✗ case DXGI_FORMAT_BC1_UNORM_SRGB:
298 ✗ avctx->colorspace = AVCOL_SPC_RGB;
299 av_fallthrough;
300 4 case DXGI_FORMAT_BC1_TYPELESS:
301 case DXGI_FORMAT_BC1_UNORM:
302 4 ctx->dec.tex_ratio = 8;
303 4 ctx->dec.tex_funct = ctx->texdsp.dxt1a_block;
304 4 break;
305 ✗ case DXGI_FORMAT_BC2_UNORM_SRGB:
306 ✗ avctx->colorspace = AVCOL_SPC_RGB;
307 av_fallthrough;
308 2 case DXGI_FORMAT_BC2_TYPELESS:
309 case DXGI_FORMAT_BC2_UNORM:
310 2 ctx->dec.tex_ratio = 16;
311 2 ctx->dec.tex_funct = ctx->texdsp.dxt3_block;
312 2 break;
313 ✗ case DXGI_FORMAT_BC3_UNORM_SRGB:
314 ✗ avctx->colorspace = AVCOL_SPC_RGB;
315 av_fallthrough;
316 2 case DXGI_FORMAT_BC3_TYPELESS:
317 case DXGI_FORMAT_BC3_UNORM:
318 2 ctx->dec.tex_ratio = 16;
319 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
320 2 break;
321 2 case DXGI_FORMAT_BC4_TYPELESS:
322 case DXGI_FORMAT_BC4_UNORM:
323 2 ctx->dec.tex_ratio = 8;
324 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1u_block;
325 2 break;
326 ✗ case DXGI_FORMAT_BC4_SNORM:
327 ✗ ctx->dec.tex_ratio = 8;
328 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc1s_block;
329 ✗ break;
330 2 case DXGI_FORMAT_BC5_TYPELESS:
331 case DXGI_FORMAT_BC5_UNORM:
332 2 ctx->dec.tex_ratio = 16;
333 2 ctx->dec.tex_funct = ctx->texdsp.rgtc2u_block;
334 2 break;
335 ✗ case DXGI_FORMAT_BC5_SNORM:
336 ✗ ctx->dec.tex_ratio = 16;
337 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc2s_block;
338 ✗ break;
339 ✗ default:
340 ✗ av_log(avctx, AV_LOG_ERROR,
341 "Unsupported DXGI format %d.\n", dxgi);
342 ✗ return AVERROR_INVALIDDATA;
343 }
344 12 break;
345 ✗ default:
346 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", av_fourcc2str(fourcc));
347 ✗ return AVERROR_INVALIDDATA;
348 }
349
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 28 } else if (ctx->paletted) {
350
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 2 if (bpp == 8) {
351 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
352 } else {
353 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
354 ✗ return AVERROR_INVALIDDATA;
355 }
356 } else {
357 /* 4 bpp */
358
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 26 if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
359 ✗ avctx->pix_fmt = AV_PIX_FMT_PAL8;
360 /* 8 bpp */
361
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 26 else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
362 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
363
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 24 else if (bpp == 8 && r == 0 && g == 0 && b == 0 && a == 0xff)
364 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
365 /* 16 bpp */
366
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 22 else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
367 2 avctx->pix_fmt = AV_PIX_FMT_YA8;
368
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 20 else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
369 ✗ avctx->pix_fmt = AV_PIX_FMT_YA8;
370 ✗ ctx->postproc = DDS_SWAP_ALPHA;
371 }
372
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 20 else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
373 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
374
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 20 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
375 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
376
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 18 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0x8000)
377 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE; // alpha ignored
378
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 16 else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
379 2 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
380 /* 24 bpp */
381
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 14 else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
382 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
383 /* 32 bpp */
384
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 12 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
385 2 avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
386
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 10 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
387 2 avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
388
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 8 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
389 8 avctx->pix_fmt = AV_PIX_FMT_BGRA;
390 ✗ else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
391 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
392 /* give up */
393 else {
394 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
395 "[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
396 ✗ return AVERROR_INVALIDDATA;
397 }
398 }
399
400 /* Set any remaining post-proc that should happen before frame is ready. */
401
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 96 if (alpha_exponent)
402 4 ctx->postproc = DDS_ALPHA_EXP;
403
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 92 else if (normal_map)
404 4 ctx->postproc = DDS_NORMAL_MAP;
405
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 88 else if (ycocg_classic && !ctx->compressed)
406 2 ctx->postproc = DDS_RAW_YCOCG;
407
408 /* ATI/NVidia variants sometimes add swizzling in bpp. */
409
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 96 switch (bpp) {
410 2 case MKTAG('A', '2', 'X', 'Y'):
411 2 ctx->postproc = DDS_SWIZZLE_A2XY;
412 2 break;
413 2 case MKTAG('x', 'G', 'B', 'R'):
414 2 ctx->postproc = DDS_SWIZZLE_XGBR;
415 2 break;
416 2 case MKTAG('x', 'R', 'B', 'G'):
417 2 ctx->postproc = DDS_SWIZZLE_XRBG;
418 2 break;
419 2 case MKTAG('R', 'B', 'x', 'G'):
420 2 ctx->postproc = DDS_SWIZZLE_RBXG;
421 2 break;
422 2 case MKTAG('R', 'G', 'x', 'B'):
423 2 ctx->postproc = DDS_SWIZZLE_RGXB;
424 2 break;
425 2 case MKTAG('R', 'x', 'B', 'G'):
426 2 ctx->postproc = DDS_SWIZZLE_RXBG;
427 2 break;
428 2 case MKTAG('x', 'G', 'x', 'R'):
429 2 ctx->postproc = DDS_SWIZZLE_XGXR;
430 2 break;
431 2 case MKTAG('A', '2', 'D', '5'):
432 2 ctx->postproc = DDS_NORMAL_MAP;
433 2 break;
434 }
435
436 96 return 0;
437 }
438
439 26 static void do_swizzle(AVFrame *frame, int x, int y)
440 {
441 int i;
442
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 106522 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
443 106496 uint8_t *src = frame->data[0] + i;
444 106496 FFSWAP(uint8_t, src[x], src[y]);
445 }
446 26 }
447
448 28 static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
449 {
450 28 DDSContext *ctx = avctx->priv_data;
451 int i, x_off;
452
453
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 28 switch (ctx->postproc) {
454 4 case DDS_ALPHA_EXP:
455 /* Alpha-exponential mode divides each channel by the maximum
456 * R, G or B value, and stores the multiplying factor in the
457 * alpha channel. */
458 4 av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
459
460
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 16388 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
461 16384 uint8_t *src = frame->data[0] + i;
462 16384 int r = src[0];
463 16384 int g = src[1];
464 16384 int b = src[2];
465 16384 int a = src[3];
466
467 16384 src[0] = r * a / 255;
468 16384 src[1] = g * a / 255;
469 16384 src[2] = b * a / 255;
470 16384 src[3] = 255;
471 }
472 4 break;
473 6 case DDS_NORMAL_MAP:
474 /* Normal maps work in the XYZ color space and they encode
475 * X in R or in A, depending on the texture type, Y in G and
476 * derive Z with a square root of the distance.
477 *
478 * http://www.realtimecollisiondetection.net/blog/?p=28 */
479 6 av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
480
481
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 6 x_off = ctx->dec.tex_ratio == 8 ? 0 : 3;
482
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 24582 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
483 24576 uint8_t *src = frame->data[0] + i;
484 24576 int x = src[x_off];
485 24576 int y = src[1];
486 24576 int z = 127;
487
488 24576 int d = (255 * 255 - x * x - y * y) / 2;
489
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 24576 if (d > 0)
490 20740 z = lrint(sqrtf(d));
491
492 24576 src[0] = x;
493 24576 src[1] = y;
494 24576 src[2] = z;
495 24576 src[3] = 255;
496 }
497 6 break;
498 2 case DDS_RAW_YCOCG:
499 /* Data is Y-Co-Cg-A and not RGBA, but they are represented
500 * with the same masks in the DDPF header. */
501 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
502
503
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 8194 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
504 8192 uint8_t *src = frame->data[0] + i;
505 8192 int a = src[0];
506 8192 int cg = src[1] - 128;
507 8192 int co = src[2] - 128;
508 8192 int y = src[3];
509
510 8192 src[0] = av_clip_uint8(y + co - cg);
511 8192 src[1] = av_clip_uint8(y + cg);
512 8192 src[2] = av_clip_uint8(y - co - cg);
513 8192 src[3] = a;
514 }
515 2 break;
516 ✗ case DDS_SWAP_ALPHA:
517 /* Alpha and Luma are stored swapped. */
518 ✗ av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
519
520 ✗ for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
521 ✗ uint8_t *src = frame->data[0] + i;
522 ✗ FFSWAP(uint8_t, src[0], src[1]);
523 }
524 ✗ break;
525 2 case DDS_SWIZZLE_A2XY:
526 /* Swap R and G, often used to restore a standard RGTC2. */
527 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
528 2 do_swizzle(frame, 0, 1);
529 2 break;
530 2 case DDS_SWIZZLE_RBXG:
531 /* Swap G and A, then B and new A (G). */
532 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
533 2 do_swizzle(frame, 1, 3);
534 2 do_swizzle(frame, 2, 3);
535 2 break;
536 2 case DDS_SWIZZLE_RGXB:
537 /* Swap B and A. */
538 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
539 2 do_swizzle(frame, 2, 3);
540 2 break;
541 2 case DDS_SWIZZLE_RXBG:
542 /* Swap G and A. */
543 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
544 2 do_swizzle(frame, 1, 3);
545 2 break;
546 2 case DDS_SWIZZLE_RXGB:
547 /* Swap R and A (misleading name). */
548 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
549 2 do_swizzle(frame, 0, 3);
550 2 break;
551 2 case DDS_SWIZZLE_XGBR:
552 /* Swap B and A, then R and new A (B). */
553 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
554 2 do_swizzle(frame, 2, 3);
555 2 do_swizzle(frame, 0, 3);
556 2 break;
557 2 case DDS_SWIZZLE_XGXR:
558 /* Swap G and A, then R and new A (G), then new R (G) and new G (A).
559 * This variant does not store any B component. */
560 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
561 2 do_swizzle(frame, 1, 3);
562 2 do_swizzle(frame, 0, 3);
563 2 do_swizzle(frame, 0, 1);
564 2 break;
565 2 case DDS_SWIZZLE_XRBG:
566 /* Swap G and A, then R and new A (G). */
567 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
568 2 do_swizzle(frame, 1, 3);
569 2 do_swizzle(frame, 0, 3);
570 2 break;
571 }
572 28 }
573
574 96 static int dds_decode(AVCodecContext *avctx, AVFrame *frame,
575 int *got_frame, AVPacket *avpkt)
576 {
577 96 DDSContext *ctx = avctx->priv_data;
578 96 GetByteContext *gbc = &ctx->gbc;
579 int mipmap;
580 int ret;
581 int width, height;
582
583 96 ff_texturedsp_init(&ctx->texdsp);
584 96 bytestream2_init(gbc, avpkt->data, avpkt->size);
585
586
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 96 if (bytestream2_get_bytes_left(gbc) < 128) {
587 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n",
588 bytestream2_get_bytes_left(gbc));
589 ✗ return AVERROR_INVALIDDATA;
590 }
591
592
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 192 if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
593 96 bytestream2_get_le32(gbc) != 124) { // header size
594 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.\n");
595 ✗ return AVERROR_INVALIDDATA;
596 }
597
598 96 bytestream2_skip(gbc, 4); // flags
599
600 96 height = bytestream2_get_le32(gbc);
601 96 width = bytestream2_get_le32(gbc);
602 96 ret = ff_set_dimensions(avctx, width, height);
603
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 96 if (ret < 0) {
604 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
605 avctx->width, avctx->height);
606 ✗ return ret;
607 }
608
609 /* Since codec is based on 4x4 blocks, size is aligned to 4. */
610 96 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
611 96 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
612
613 96 bytestream2_skip(gbc, 4); // pitch
614 96 bytestream2_skip(gbc, 4); // depth
615 96 mipmap = bytestream2_get_le32(gbc);
616
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 96 if (mipmap != 0)
617 56 av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
618
619 /* Extract pixel format information, considering additional elements
620 * in reserved1 and reserved2. */
621 96 ret = parse_pixel_format(avctx);
622
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 96 if (ret < 0)
623 ✗ return ret;
624
625 96 ret = ff_get_buffer(avctx, frame, 0);
626
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 96 if (ret < 0)
627 ✗ return ret;
628
629
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 96 if (ctx->compressed) {
630 60 int size = (avctx->coded_height / TEXTURE_BLOCK_H) *
631 60 (avctx->coded_width / TEXTURE_BLOCK_W) * ctx->dec.tex_ratio;
632 60 ctx->dec.slice_count = av_clip(avctx->thread_count, 1,
633 60 avctx->coded_height / TEXTURE_BLOCK_H);
634
635
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 60 if (bytestream2_get_bytes_left(gbc) < size) {
636 ✗ av_log(avctx, AV_LOG_ERROR,
637 "Compressed Buffer is too small (%d < %d).\n",
638 bytestream2_get_bytes_left(gbc), size);
639 ✗ return AVERROR_INVALIDDATA;
640 }
641
642 /* Use the decompress function on the texture, one block per thread. */
643 60 ctx->dec.tex_data.in = gbc->buffer;
644 60 ctx->dec.frame_data.out = frame->data[0];
645 60 ctx->dec.stride = frame->linesize[0];
646 60 ctx->dec.width = avctx->coded_width;
647 60 ctx->dec.height = avctx->coded_height;
648 60 ff_texturedsp_exec_decompress_threads(avctx, &ctx->dec);
649
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 36 } else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
650 ✗ uint8_t *dst = frame->data[0];
651 int x, y, i;
652
653 /* Use the first 64 bytes as palette, then copy the rest. */
654 ✗ bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
655 ✗ for (i = 0; i < 16; i++) {
656 ✗ AV_WN32(frame->data[1] + i*4,
657 (frame->data[1][2+i*4]<<0)+
658 (frame->data[1][1+i*4]<<8)+
659 (frame->data[1][0+i*4]<<16)+
660 ((unsigned)frame->data[1][3+i*4]<<24)
661 );
662 }
663
664 ✗ if (bytestream2_get_bytes_left(gbc) < frame->height * frame->width / 2) {
665 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
666 ✗ bytestream2_get_bytes_left(gbc), frame->height * frame->width / 2);
667 ✗ return AVERROR_INVALIDDATA;
668 }
669
670 ✗ for (y = 0; y < frame->height; y++) {
671 ✗ for (x = 0; x < frame->width; x += 2) {
672 ✗ uint8_t val = bytestream2_get_byte(gbc);
673 ✗ dst[x ] = val & 0xF;
674 ✗ dst[x + 1] = val >> 4;
675 }
676 ✗ dst += frame->linesize[0];
677 }
678 } else {
679 36 int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
680
681
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 36 if (ctx->paletted) {
682 int i;
683 /* Use the first 1024 bytes as palette, then copy the rest. */
684 4 bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
685
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 1028 for (i = 0; i < 256; i++)
686 1024 AV_WN32(frame->data[1] + i*4,
687 (frame->data[1][2+i*4]<<0)+
688 (frame->data[1][1+i*4]<<8)+
689 (frame->data[1][0+i*4]<<16)+
690 ((unsigned)frame->data[1][3+i*4]<<24)
691 );
692 }
693
694
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 36 if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
695 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
696 ✗ bytestream2_get_bytes_left(gbc), frame->height * linesize);
697 ✗ return AVERROR_INVALIDDATA;
698 }
699
700 36 av_image_copy_plane(frame->data[0], frame->linesize[0],
701 gbc->buffer, linesize,
702 linesize, frame->height);
703 }
704
705 /* Run any post processing here if needed. */
706
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 96 if (ctx->postproc != DDS_NONE)
707 28 run_postproc(avctx, frame);
708
709 /* Frame is ready to be output. */
710 96 *got_frame = 1;
711
712 96 return avpkt->size;
713 }
714
715 const FFCodec ff_dds_decoder = {
716 .p.name = "dds",
717 CODEC_LONG_NAME("DirectDraw Surface image decoder"),
718 .p.type = AVMEDIA_TYPE_VIDEO,
719 .p.id = AV_CODEC_ID_DDS,
720 FF_CODEC_DECODE_CB(dds_decode),
721 .priv_data_size = sizeof(DDSContext),
722 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
723 };
724