FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dds.c
Date: 2025-07-18 13:13:50
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/libm.h"
32 #include "libavutil/imgutils.h"
33
34 #include "avcodec.h"
35 #include "bytestream.h"
36 #include "codec_internal.h"
37 #include "decode.h"
38 #include "texturedsp.h"
39
40 #define DDPF_FOURCC (1 << 2)
41 #define DDPF_PALETTE (1 << 5)
42 #define DDPF_NORMALMAP (1U << 31)
43
44 enum DDSPostProc {
45 DDS_NONE = 0,
46 DDS_ALPHA_EXP,
47 DDS_NORMAL_MAP,
48 DDS_RAW_YCOCG,
49 DDS_SWAP_ALPHA,
50 DDS_SWIZZLE_A2XY,
51 DDS_SWIZZLE_RBXG,
52 DDS_SWIZZLE_RGXB,
53 DDS_SWIZZLE_RXBG,
54 DDS_SWIZZLE_RXGB,
55 DDS_SWIZZLE_XGBR,
56 DDS_SWIZZLE_XRBG,
57 DDS_SWIZZLE_XGXR,
58 };
59
60 enum DDSDXGIFormat {
61 DXGI_FORMAT_R16G16B16A16_TYPELESS = 9,
62 DXGI_FORMAT_R16G16B16A16_FLOAT = 10,
63 DXGI_FORMAT_R16G16B16A16_UNORM = 11,
64 DXGI_FORMAT_R16G16B16A16_UINT = 12,
65 DXGI_FORMAT_R16G16B16A16_SNORM = 13,
66 DXGI_FORMAT_R16G16B16A16_SINT = 14,
67
68 DXGI_FORMAT_R8G8B8A8_TYPELESS = 27,
69 DXGI_FORMAT_R8G8B8A8_UNORM = 28,
70 DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29,
71 DXGI_FORMAT_R8G8B8A8_UINT = 30,
72 DXGI_FORMAT_R8G8B8A8_SNORM = 31,
73 DXGI_FORMAT_R8G8B8A8_SINT = 32,
74
75 DXGI_FORMAT_BC1_TYPELESS = 70,
76 DXGI_FORMAT_BC1_UNORM = 71,
77 DXGI_FORMAT_BC1_UNORM_SRGB = 72,
78 DXGI_FORMAT_BC2_TYPELESS = 73,
79 DXGI_FORMAT_BC2_UNORM = 74,
80 DXGI_FORMAT_BC2_UNORM_SRGB = 75,
81 DXGI_FORMAT_BC3_TYPELESS = 76,
82 DXGI_FORMAT_BC3_UNORM = 77,
83 DXGI_FORMAT_BC3_UNORM_SRGB = 78,
84 DXGI_FORMAT_BC4_TYPELESS = 79,
85 DXGI_FORMAT_BC4_UNORM = 80,
86 DXGI_FORMAT_BC4_SNORM = 81,
87 DXGI_FORMAT_BC5_TYPELESS = 82,
88 DXGI_FORMAT_BC5_UNORM = 83,
89 DXGI_FORMAT_BC5_SNORM = 84,
90 DXGI_FORMAT_B5G6R5_UNORM = 85,
91 DXGI_FORMAT_B8G8R8A8_UNORM = 87,
92 DXGI_FORMAT_B8G8R8X8_UNORM = 88,
93 DXGI_FORMAT_B8G8R8A8_TYPELESS = 90,
94 DXGI_FORMAT_B8G8R8A8_UNORM_SRGB = 91,
95 DXGI_FORMAT_B8G8R8X8_TYPELESS = 92,
96 DXGI_FORMAT_B8G8R8X8_UNORM_SRGB = 93,
97 };
98
99 typedef struct DDSContext {
100 TextureDSPContext texdsp;
101 GetByteContext gbc;
102
103 int compressed;
104 int paletted;
105 int bpp;
106 enum DDSPostProc postproc;
107
108 TextureDSPThreadContext dec;
109 } DDSContext;
110
111 96 static int parse_pixel_format(AVCodecContext *avctx)
112 {
113 96 DDSContext *ctx = avctx->priv_data;
114 96 GetByteContext *gbc = &ctx->gbc;
115 uint32_t flags, fourcc, gimp_tag;
116 enum DDSDXGIFormat dxgi;
117 int size, bpp, r, g, b, a;
118 int alpha_exponent, ycocg_classic, ycocg_scaled, normal_map, array;
119
120 /* Alternative DDS implementations use reserved1 as custom header. */
121 96 bytestream2_skip(gbc, 4 * 3);
122 96 gimp_tag = bytestream2_get_le32(gbc);
123 96 alpha_exponent = gimp_tag == MKTAG('A', 'E', 'X', 'P');
124 96 ycocg_classic = gimp_tag == MKTAG('Y', 'C', 'G', '1');
125 96 ycocg_scaled = gimp_tag == MKTAG('Y', 'C', 'G', '2');
126 96 bytestream2_skip(gbc, 4 * 7);
127
128 /* Now the real DDPF starts. */
129 96 size = bytestream2_get_le32(gbc);
130
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 96 if (size != 32) {
131 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
132 ✗ return AVERROR_INVALIDDATA;
133 }
134 96 flags = bytestream2_get_le32(gbc);
135 96 ctx->compressed = flags & DDPF_FOURCC;
136 96 ctx->paletted = flags & DDPF_PALETTE;
137 96 normal_map = flags & DDPF_NORMALMAP;
138 96 fourcc = bytestream2_get_le32(gbc);
139
140
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 96 if (ctx->compressed && ctx->paletted) {
141 ✗ av_log(avctx, AV_LOG_WARNING,
142 "Disabling invalid palette flag for compressed dds.\n");
143 ✗ ctx->paletted = 0;
144 }
145
146 96 bpp = ctx->bpp = bytestream2_get_le32(gbc); // rgbbitcount
147 96 r = bytestream2_get_le32(gbc); // rbitmask
148 96 g = bytestream2_get_le32(gbc); // gbitmask
149 96 b = bytestream2_get_le32(gbc); // bbitmask
150 96 a = bytestream2_get_le32(gbc); // abitmask
151
152 96 bytestream2_skip(gbc, 4); // caps
153 96 bytestream2_skip(gbc, 4); // caps2
154 96 bytestream2_skip(gbc, 4); // caps3
155 96 bytestream2_skip(gbc, 4); // caps4
156 96 bytestream2_skip(gbc, 4); // reserved2
157
158 96 av_log(avctx, AV_LOG_VERBOSE, "fourcc %s bpp %d "
159 96 "r 0x%x g 0x%x b 0x%x a 0x%x\n", av_fourcc2str(fourcc), bpp, r, g, b, a);
160
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 96 if (gimp_tag)
161 10 av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", av_fourcc2str(gimp_tag));
162
163
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 96 if (ctx->compressed)
164 68 avctx->pix_fmt = AV_PIX_FMT_RGBA;
165
166
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 96 if (ctx->compressed) {
167 68 ctx->dec.raw_ratio = 16;
168
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 68 switch (fourcc) {
169 6 case MKTAG('D', 'X', 'T', '1'):
170 6 ctx->dec.tex_ratio = 8;
171 6 ctx->dec.tex_funct = ctx->texdsp.dxt1a_block;
172 68 break;
173 2 case MKTAG('D', 'X', 'T', '2'):
174 2 ctx->dec.tex_ratio = 16;
175 2 ctx->dec.tex_funct = ctx->texdsp.dxt2_block;
176 2 break;
177 2 case MKTAG('D', 'X', 'T', '3'):
178 2 ctx->dec.tex_ratio = 16;
179 2 ctx->dec.tex_funct = ctx->texdsp.dxt3_block;
180 2 break;
181 2 case MKTAG('D', 'X', 'T', '4'):
182 2 ctx->dec.tex_ratio = 16;
183 2 ctx->dec.tex_funct = ctx->texdsp.dxt4_block;
184 2 break;
185 24 case MKTAG('D', 'X', 'T', '5'):
186 24 ctx->dec.tex_ratio = 16;
187
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 24 if (ycocg_scaled)
188 2 ctx->dec.tex_funct = ctx->texdsp.dxt5ys_block;
189
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 22 else if (ycocg_classic)
190 2 ctx->dec.tex_funct = ctx->texdsp.dxt5y_block;
191 else
192 20 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
193 24 break;
194 2 case MKTAG('R', 'X', 'G', 'B'):
195 2 ctx->dec.tex_ratio = 16;
196 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
197 /* This format may be considered as a normal map,
198 * but it is handled differently in a separate postproc. */
199 2 ctx->postproc = DDS_SWIZZLE_RXGB;
200 2 normal_map = 0;
201 2 break;
202 2 case MKTAG('A', 'T', 'I', '1'):
203 case MKTAG('B', 'C', '4', 'U'):
204 2 ctx->dec.tex_ratio = 8;
205 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1u_block;
206 2 break;
207 2 case MKTAG('B', 'C', '4', 'S'):
208 2 ctx->dec.tex_ratio = 8;
209 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1s_block;
210 2 break;
211 4 case MKTAG('A', 'T', 'I', '2'):
212 /* RGT2 variant with swapped R and G (3Dc)*/
213 4 ctx->dec.tex_ratio = 16;
214 4 ctx->dec.tex_funct = ctx->texdsp.dxn3dc_block;
215 4 break;
216 ✗ case MKTAG('B', 'C', '5', 'U'):
217 ✗ ctx->dec.tex_ratio = 16;
218 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc2u_block;
219 ✗ break;
220 2 case MKTAG('B', 'C', '5', 'S'):
221 2 ctx->dec.tex_ratio = 16;
222 2 ctx->dec.tex_funct = ctx->texdsp.rgtc2s_block;
223 2 break;
224 2 case MKTAG('U', 'Y', 'V', 'Y'):
225 2 ctx->compressed = 0;
226 2 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
227 2 break;
228 2 case MKTAG('Y', 'U', 'Y', '2'):
229 2 ctx->compressed = 0;
230 2 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
231 2 break;
232 2 case MKTAG('P', '8', ' ', ' '):
233 /* ATI Palette8, same as normal palette */
234 2 ctx->compressed = 0;
235 2 ctx->paletted = 1;
236 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
237 2 break;
238 2 case MKTAG('G', '1', ' ', ' '):
239 2 ctx->compressed = 0;
240 2 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
241 2 break;
242 12 case MKTAG('D', 'X', '1', '0'):
243 /* DirectX 10 extra header */
244 12 dxgi = bytestream2_get_le32(gbc);
245 12 bytestream2_skip(gbc, 4); // resourceDimension
246 12 bytestream2_skip(gbc, 4); // miscFlag
247 12 array = bytestream2_get_le32(gbc);
248 12 bytestream2_skip(gbc, 4); // miscFlag2
249
250
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 12 if (array != 0)
251 12 av_log(avctx, AV_LOG_VERBOSE,
252 "Found array of size %d (ignored).\n", array);
253
254 /* Only BC[1-5] are actually compressed. */
255
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 12 ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
256
257 12 av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
258
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 12 switch (dxgi) {
259 /* RGB types. */
260 ✗ case DXGI_FORMAT_R16G16B16A16_TYPELESS:
261 case DXGI_FORMAT_R16G16B16A16_FLOAT:
262 case DXGI_FORMAT_R16G16B16A16_UNORM:
263 case DXGI_FORMAT_R16G16B16A16_UINT:
264 case DXGI_FORMAT_R16G16B16A16_SNORM:
265 case DXGI_FORMAT_R16G16B16A16_SINT:
266 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA64;
267 ✗ break;
268 ✗ case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
269 ✗ avctx->colorspace = AVCOL_SPC_RGB;
270 ✗ case DXGI_FORMAT_R8G8B8A8_TYPELESS:
271 case DXGI_FORMAT_R8G8B8A8_UNORM:
272 case DXGI_FORMAT_R8G8B8A8_UINT:
273 case DXGI_FORMAT_R8G8B8A8_SNORM:
274 case DXGI_FORMAT_R8G8B8A8_SINT:
275 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA;
276 ✗ break;
277 ✗ case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
278 ✗ avctx->colorspace = AVCOL_SPC_RGB;
279 ✗ case DXGI_FORMAT_B8G8R8A8_TYPELESS:
280 case DXGI_FORMAT_B8G8R8A8_UNORM:
281 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
282 ✗ break;
283 ✗ case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
284 ✗ avctx->colorspace = AVCOL_SPC_RGB;
285 ✗ case DXGI_FORMAT_B8G8R8X8_TYPELESS:
286 case DXGI_FORMAT_B8G8R8X8_UNORM:
287 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
288 ✗ break;
289 ✗ case DXGI_FORMAT_B5G6R5_UNORM:
290 ✗ avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
291 ✗ break;
292 /* Texture types. */
293 ✗ case DXGI_FORMAT_BC1_UNORM_SRGB:
294 ✗ avctx->colorspace = AVCOL_SPC_RGB;
295 4 case DXGI_FORMAT_BC1_TYPELESS:
296 case DXGI_FORMAT_BC1_UNORM:
297 4 ctx->dec.tex_ratio = 8;
298 4 ctx->dec.tex_funct = ctx->texdsp.dxt1a_block;
299 4 break;
300 ✗ case DXGI_FORMAT_BC2_UNORM_SRGB:
301 ✗ avctx->colorspace = AVCOL_SPC_RGB;
302 2 case DXGI_FORMAT_BC2_TYPELESS:
303 case DXGI_FORMAT_BC2_UNORM:
304 2 ctx->dec.tex_ratio = 16;
305 2 ctx->dec.tex_funct = ctx->texdsp.dxt3_block;
306 2 break;
307 ✗ case DXGI_FORMAT_BC3_UNORM_SRGB:
308 ✗ avctx->colorspace = AVCOL_SPC_RGB;
309 2 case DXGI_FORMAT_BC3_TYPELESS:
310 case DXGI_FORMAT_BC3_UNORM:
311 2 ctx->dec.tex_ratio = 16;
312 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
313 2 break;
314 2 case DXGI_FORMAT_BC4_TYPELESS:
315 case DXGI_FORMAT_BC4_UNORM:
316 2 ctx->dec.tex_ratio = 8;
317 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1u_block;
318 2 break;
319 ✗ case DXGI_FORMAT_BC4_SNORM:
320 ✗ ctx->dec.tex_ratio = 8;
321 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc1s_block;
322 ✗ break;
323 2 case DXGI_FORMAT_BC5_TYPELESS:
324 case DXGI_FORMAT_BC5_UNORM:
325 2 ctx->dec.tex_ratio = 16;
326 2 ctx->dec.tex_funct = ctx->texdsp.rgtc2u_block;
327 2 break;
328 ✗ case DXGI_FORMAT_BC5_SNORM:
329 ✗ ctx->dec.tex_ratio = 16;
330 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc2s_block;
331 ✗ break;
332 ✗ default:
333 ✗ av_log(avctx, AV_LOG_ERROR,
334 "Unsupported DXGI format %d.\n", dxgi);
335 ✗ return AVERROR_INVALIDDATA;
336 }
337 12 break;
338 ✗ default:
339 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", av_fourcc2str(fourcc));
340 ✗ return AVERROR_INVALIDDATA;
341 }
342
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 28 } else if (ctx->paletted) {
343
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 2 if (bpp == 8) {
344 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
345 } else {
346 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
347 ✗ return AVERROR_INVALIDDATA;
348 }
349 } else {
350 /* 4 bpp */
351
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 26 if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
352 ✗ avctx->pix_fmt = AV_PIX_FMT_PAL8;
353 /* 8 bpp */
354
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 26 else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
355 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
356
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 24 else if (bpp == 8 && r == 0 && g == 0 && b == 0 && a == 0xff)
357 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
358 /* 16 bpp */
359
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 22 else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
360 2 avctx->pix_fmt = AV_PIX_FMT_YA8;
361
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 20 else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
362 ✗ avctx->pix_fmt = AV_PIX_FMT_YA8;
363 ✗ ctx->postproc = DDS_SWAP_ALPHA;
364 }
365
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 20 else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
366 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
367
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 20 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
368 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
369
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 18 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0x8000)
370 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE; // alpha ignored
371
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 16 else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
372 2 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
373 /* 24 bpp */
374
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 14 else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
375 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
376 /* 32 bpp */
377
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 12 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
378 2 avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
379
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 10 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
380 2 avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
381
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 8 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
382 8 avctx->pix_fmt = AV_PIX_FMT_BGRA;
383 ✗ else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
384 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
385 /* give up */
386 else {
387 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
388 "[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
389 ✗ return AVERROR_INVALIDDATA;
390 }
391 }
392
393 /* Set any remaining post-proc that should happen before frame is ready. */
394
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 96 if (alpha_exponent)
395 4 ctx->postproc = DDS_ALPHA_EXP;
396
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 92 else if (normal_map)
397 4 ctx->postproc = DDS_NORMAL_MAP;
398
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 88 else if (ycocg_classic && !ctx->compressed)
399 2 ctx->postproc = DDS_RAW_YCOCG;
400
401 /* ATI/NVidia variants sometimes add swizzling in bpp. */
402
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 96 switch (bpp) {
403 2 case MKTAG('A', '2', 'X', 'Y'):
404 2 ctx->postproc = DDS_SWIZZLE_A2XY;
405 2 break;
406 2 case MKTAG('x', 'G', 'B', 'R'):
407 2 ctx->postproc = DDS_SWIZZLE_XGBR;
408 2 break;
409 2 case MKTAG('x', 'R', 'B', 'G'):
410 2 ctx->postproc = DDS_SWIZZLE_XRBG;
411 2 break;
412 2 case MKTAG('R', 'B', 'x', 'G'):
413 2 ctx->postproc = DDS_SWIZZLE_RBXG;
414 2 break;
415 2 case MKTAG('R', 'G', 'x', 'B'):
416 2 ctx->postproc = DDS_SWIZZLE_RGXB;
417 2 break;
418 2 case MKTAG('R', 'x', 'B', 'G'):
419 2 ctx->postproc = DDS_SWIZZLE_RXBG;
420 2 break;
421 2 case MKTAG('x', 'G', 'x', 'R'):
422 2 ctx->postproc = DDS_SWIZZLE_XGXR;
423 2 break;
424 2 case MKTAG('A', '2', 'D', '5'):
425 2 ctx->postproc = DDS_NORMAL_MAP;
426 2 break;
427 }
428
429 96 return 0;
430 }
431
432 26 static void do_swizzle(AVFrame *frame, int x, int y)
433 {
434 int i;
435
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 106522 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
436 106496 uint8_t *src = frame->data[0] + i;
437 106496 FFSWAP(uint8_t, src[x], src[y]);
438 }
439 26 }
440
441 28 static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
442 {
443 28 DDSContext *ctx = avctx->priv_data;
444 int i, x_off;
445
446
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 28 switch (ctx->postproc) {
447 4 case DDS_ALPHA_EXP:
448 /* Alpha-exponential mode divides each channel by the maximum
449 * R, G or B value, and stores the multiplying factor in the
450 * alpha channel. */
451 4 av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
452
453
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 16388 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
454 16384 uint8_t *src = frame->data[0] + i;
455 16384 int r = src[0];
456 16384 int g = src[1];
457 16384 int b = src[2];
458 16384 int a = src[3];
459
460 16384 src[0] = r * a / 255;
461 16384 src[1] = g * a / 255;
462 16384 src[2] = b * a / 255;
463 16384 src[3] = 255;
464 }
465 4 break;
466 6 case DDS_NORMAL_MAP:
467 /* Normal maps work in the XYZ color space and they encode
468 * X in R or in A, depending on the texture type, Y in G and
469 * derive Z with a square root of the distance.
470 *
471 * http://www.realtimecollisiondetection.net/blog/?p=28 */
472 6 av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
473
474
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 6 x_off = ctx->dec.tex_ratio == 8 ? 0 : 3;
475
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 24582 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
476 24576 uint8_t *src = frame->data[0] + i;
477 24576 int x = src[x_off];
478 24576 int y = src[1];
479 24576 int z = 127;
480
481 24576 int d = (255 * 255 - x * x - y * y) / 2;
482
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 24576 if (d > 0)
483 20740 z = lrint(sqrtf(d));
484
485 24576 src[0] = x;
486 24576 src[1] = y;
487 24576 src[2] = z;
488 24576 src[3] = 255;
489 }
490 6 break;
491 2 case DDS_RAW_YCOCG:
492 /* Data is Y-Co-Cg-A and not RGBA, but they are represented
493 * with the same masks in the DDPF header. */
494 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
495
496
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 8194 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
497 8192 uint8_t *src = frame->data[0] + i;
498 8192 int a = src[0];
499 8192 int cg = src[1] - 128;
500 8192 int co = src[2] - 128;
501 8192 int y = src[3];
502
503 8192 src[0] = av_clip_uint8(y + co - cg);
504 8192 src[1] = av_clip_uint8(y + cg);
505 8192 src[2] = av_clip_uint8(y - co - cg);
506 8192 src[3] = a;
507 }
508 2 break;
509 ✗ case DDS_SWAP_ALPHA:
510 /* Alpha and Luma are stored swapped. */
511 ✗ av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
512
513 ✗ for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
514 ✗ uint8_t *src = frame->data[0] + i;
515 ✗ FFSWAP(uint8_t, src[0], src[1]);
516 }
517 ✗ break;
518 2 case DDS_SWIZZLE_A2XY:
519 /* Swap R and G, often used to restore a standard RGTC2. */
520 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
521 2 do_swizzle(frame, 0, 1);
522 2 break;
523 2 case DDS_SWIZZLE_RBXG:
524 /* Swap G and A, then B and new A (G). */
525 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
526 2 do_swizzle(frame, 1, 3);
527 2 do_swizzle(frame, 2, 3);
528 2 break;
529 2 case DDS_SWIZZLE_RGXB:
530 /* Swap B and A. */
531 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
532 2 do_swizzle(frame, 2, 3);
533 2 break;
534 2 case DDS_SWIZZLE_RXBG:
535 /* Swap G and A. */
536 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
537 2 do_swizzle(frame, 1, 3);
538 2 break;
539 2 case DDS_SWIZZLE_RXGB:
540 /* Swap R and A (misleading name). */
541 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
542 2 do_swizzle(frame, 0, 3);
543 2 break;
544 2 case DDS_SWIZZLE_XGBR:
545 /* Swap B and A, then R and new A (B). */
546 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
547 2 do_swizzle(frame, 2, 3);
548 2 do_swizzle(frame, 0, 3);
549 2 break;
550 2 case DDS_SWIZZLE_XGXR:
551 /* Swap G and A, then R and new A (G), then new R (G) and new G (A).
552 * This variant does not store any B component. */
553 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
554 2 do_swizzle(frame, 1, 3);
555 2 do_swizzle(frame, 0, 3);
556 2 do_swizzle(frame, 0, 1);
557 2 break;
558 2 case DDS_SWIZZLE_XRBG:
559 /* Swap G and A, then R and new A (G). */
560 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
561 2 do_swizzle(frame, 1, 3);
562 2 do_swizzle(frame, 0, 3);
563 2 break;
564 }
565 28 }
566
567 96 static int dds_decode(AVCodecContext *avctx, AVFrame *frame,
568 int *got_frame, AVPacket *avpkt)
569 {
570 96 DDSContext *ctx = avctx->priv_data;
571 96 GetByteContext *gbc = &ctx->gbc;
572 int mipmap;
573 int ret;
574 int width, height;
575
576 96 ff_texturedsp_init(&ctx->texdsp);
577 96 bytestream2_init(gbc, avpkt->data, avpkt->size);
578
579
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 96 if (bytestream2_get_bytes_left(gbc) < 128) {
580 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n",
581 bytestream2_get_bytes_left(gbc));
582 ✗ return AVERROR_INVALIDDATA;
583 }
584
585
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 192 if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
586 96 bytestream2_get_le32(gbc) != 124) { // header size
587 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.\n");
588 ✗ return AVERROR_INVALIDDATA;
589 }
590
591 96 bytestream2_skip(gbc, 4); // flags
592
593 96 height = bytestream2_get_le32(gbc);
594 96 width = bytestream2_get_le32(gbc);
595 96 ret = ff_set_dimensions(avctx, width, height);
596
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 96 if (ret < 0) {
597 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
598 avctx->width, avctx->height);
599 ✗ return ret;
600 }
601
602 /* Since codec is based on 4x4 blocks, size is aligned to 4. */
603 96 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
604 96 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
605
606 96 bytestream2_skip(gbc, 4); // pitch
607 96 bytestream2_skip(gbc, 4); // depth
608 96 mipmap = bytestream2_get_le32(gbc);
609
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 96 if (mipmap != 0)
610 56 av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
611
612 /* Extract pixel format information, considering additional elements
613 * in reserved1 and reserved2. */
614 96 ret = parse_pixel_format(avctx);
615
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 96 if (ret < 0)
616 ✗ return ret;
617
618 96 ret = ff_get_buffer(avctx, frame, 0);
619
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 96 if (ret < 0)
620 ✗ return ret;
621
622
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 96 if (ctx->compressed) {
623 60 int size = (avctx->coded_height / TEXTURE_BLOCK_H) *
624 60 (avctx->coded_width / TEXTURE_BLOCK_W) * ctx->dec.tex_ratio;
625 60 ctx->dec.slice_count = av_clip(avctx->thread_count, 1,
626 60 avctx->coded_height / TEXTURE_BLOCK_H);
627
628
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 60 if (bytestream2_get_bytes_left(gbc) < size) {
629 ✗ av_log(avctx, AV_LOG_ERROR,
630 "Compressed Buffer is too small (%d < %d).\n",
631 bytestream2_get_bytes_left(gbc), size);
632 ✗ return AVERROR_INVALIDDATA;
633 }
634
635 /* Use the decompress function on the texture, one block per thread. */
636 60 ctx->dec.tex_data.in = gbc->buffer;
637 60 ctx->dec.frame_data.out = frame->data[0];
638 60 ctx->dec.stride = frame->linesize[0];
639 60 ctx->dec.width = avctx->coded_width;
640 60 ctx->dec.height = avctx->coded_height;
641 60 ff_texturedsp_exec_decompress_threads(avctx, &ctx->dec);
642
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 36 } else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
643 ✗ uint8_t *dst = frame->data[0];
644 int x, y, i;
645
646 /* Use the first 64 bytes as palette, then copy the rest. */
647 ✗ bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
648 ✗ for (i = 0; i < 16; i++) {
649 ✗ AV_WN32(frame->data[1] + i*4,
650 (frame->data[1][2+i*4]<<0)+
651 (frame->data[1][1+i*4]<<8)+
652 (frame->data[1][0+i*4]<<16)+
653 ((unsigned)frame->data[1][3+i*4]<<24)
654 );
655 }
656
657 ✗ if (bytestream2_get_bytes_left(gbc) < frame->height * frame->width / 2) {
658 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
659 ✗ bytestream2_get_bytes_left(gbc), frame->height * frame->width / 2);
660 ✗ return AVERROR_INVALIDDATA;
661 }
662
663 ✗ for (y = 0; y < frame->height; y++) {
664 ✗ for (x = 0; x < frame->width; x += 2) {
665 ✗ uint8_t val = bytestream2_get_byte(gbc);
666 ✗ dst[x ] = val & 0xF;
667 ✗ dst[x + 1] = val >> 4;
668 }
669 ✗ dst += frame->linesize[0];
670 }
671 } else {
672 36 int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
673
674
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 36 if (ctx->paletted) {
675 int i;
676 /* Use the first 1024 bytes as palette, then copy the rest. */
677 4 bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
678
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 1028 for (i = 0; i < 256; i++)
679 1024 AV_WN32(frame->data[1] + i*4,
680 (frame->data[1][2+i*4]<<0)+
681 (frame->data[1][1+i*4]<<8)+
682 (frame->data[1][0+i*4]<<16)+
683 ((unsigned)frame->data[1][3+i*4]<<24)
684 );
685 }
686
687
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 36 if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
688 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
689 ✗ bytestream2_get_bytes_left(gbc), frame->height * linesize);
690 ✗ return AVERROR_INVALIDDATA;
691 }
692
693 36 av_image_copy_plane(frame->data[0], frame->linesize[0],
694 gbc->buffer, linesize,
695 linesize, frame->height);
696 }
697
698 /* Run any post processing here if needed. */
699
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 96 if (ctx->postproc != DDS_NONE)
700 28 run_postproc(avctx, frame);
701
702 /* Frame is ready to be output. */
703 96 *got_frame = 1;
704
705 96 return avpkt->size;
706 }
707
708 const FFCodec ff_dds_decoder = {
709 .p.name = "dds",
710 CODEC_LONG_NAME("DirectDraw Surface image decoder"),
711 .p.type = AVMEDIA_TYPE_VIDEO,
712 .p.id = AV_CODEC_ID_DDS,
713 FF_CODEC_DECODE_CB(dds_decode),
714 .priv_data_size = sizeof(DDSContext),
715 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
716 };
717