FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dds.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 325 418 77.8%
Branches: 168 267 62.9%
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 "internal.h"
38 #include "texturedsp.h"
39 #include "thread.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 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 ✗ case DXGI_FORMAT_R8G8B8A8_TYPELESS:
272 case DXGI_FORMAT_R8G8B8A8_UNORM:
273 case DXGI_FORMAT_R8G8B8A8_UINT:
274 case DXGI_FORMAT_R8G8B8A8_SNORM:
275 case DXGI_FORMAT_R8G8B8A8_SINT:
276 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA;
277 ✗ break;
278 ✗ case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
279 ✗ avctx->colorspace = AVCOL_SPC_RGB;
280 ✗ case DXGI_FORMAT_B8G8R8A8_TYPELESS:
281 case DXGI_FORMAT_B8G8R8A8_UNORM:
282 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
283 ✗ break;
284 ✗ case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
285 ✗ avctx->colorspace = AVCOL_SPC_RGB;
286 ✗ case DXGI_FORMAT_B8G8R8X8_TYPELESS:
287 case DXGI_FORMAT_B8G8R8X8_UNORM:
288 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
289 ✗ break;
290 ✗ case DXGI_FORMAT_B5G6R5_UNORM:
291 ✗ avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
292 ✗ break;
293 /* Texture types. */
294 ✗ case DXGI_FORMAT_BC1_UNORM_SRGB:
295 ✗ avctx->colorspace = AVCOL_SPC_RGB;
296 4 case DXGI_FORMAT_BC1_TYPELESS:
297 case DXGI_FORMAT_BC1_UNORM:
298 4 ctx->dec.tex_ratio = 8;
299 4 ctx->dec.tex_funct = ctx->texdsp.dxt1a_block;
300 4 break;
301 ✗ case DXGI_FORMAT_BC2_UNORM_SRGB:
302 ✗ avctx->colorspace = AVCOL_SPC_RGB;
303 2 case DXGI_FORMAT_BC2_TYPELESS:
304 case DXGI_FORMAT_BC2_UNORM:
305 2 ctx->dec.tex_ratio = 16;
306 2 ctx->dec.tex_funct = ctx->texdsp.dxt3_block;
307 2 break;
308 ✗ case DXGI_FORMAT_BC3_UNORM_SRGB:
309 ✗ avctx->colorspace = AVCOL_SPC_RGB;
310 2 case DXGI_FORMAT_BC3_TYPELESS:
311 case DXGI_FORMAT_BC3_UNORM:
312 2 ctx->dec.tex_ratio = 16;
313 2 ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
314 2 break;
315 2 case DXGI_FORMAT_BC4_TYPELESS:
316 case DXGI_FORMAT_BC4_UNORM:
317 2 ctx->dec.tex_ratio = 8;
318 2 ctx->dec.tex_funct = ctx->texdsp.rgtc1u_block;
319 2 break;
320 ✗ case DXGI_FORMAT_BC4_SNORM:
321 ✗ ctx->dec.tex_ratio = 8;
322 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc1s_block;
323 ✗ break;
324 2 case DXGI_FORMAT_BC5_TYPELESS:
325 case DXGI_FORMAT_BC5_UNORM:
326 2 ctx->dec.tex_ratio = 16;
327 2 ctx->dec.tex_funct = ctx->texdsp.rgtc2u_block;
328 2 break;
329 ✗ case DXGI_FORMAT_BC5_SNORM:
330 ✗ ctx->dec.tex_ratio = 16;
331 ✗ ctx->dec.tex_funct = ctx->texdsp.rgtc2s_block;
332 ✗ break;
333 ✗ default:
334 ✗ av_log(avctx, AV_LOG_ERROR,
335 "Unsupported DXGI format %d.\n", dxgi);
336 ✗ return AVERROR_INVALIDDATA;
337 }
338 12 break;
339 ✗ default:
340 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", av_fourcc2str(fourcc));
341 ✗ return AVERROR_INVALIDDATA;
342 }
343
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 28 } else if (ctx->paletted) {
344
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 2 if (bpp == 8) {
345 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
346 } else {
347 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
348 ✗ return AVERROR_INVALIDDATA;
349 }
350 } else {
351 /* 4 bpp */
352
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 26 if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
353 ✗ avctx->pix_fmt = AV_PIX_FMT_PAL8;
354 /* 8 bpp */
355
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 26 else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
356 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
357
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 24 else if (bpp == 8 && r == 0 && g == 0 && b == 0 && a == 0xff)
358 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
359 /* 16 bpp */
360
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 22 else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
361 2 avctx->pix_fmt = AV_PIX_FMT_YA8;
362
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 20 else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
363 ✗ avctx->pix_fmt = AV_PIX_FMT_YA8;
364 ✗ ctx->postproc = DDS_SWAP_ALPHA;
365 }
366
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 20 else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
367 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
368
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 20 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
369 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
370
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 18 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0x8000)
371 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE; // alpha ignored
372
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 16 else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
373 2 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
374 /* 24 bpp */
375
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 14 else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
376 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
377 /* 32 bpp */
378
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 12 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
379 2 avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
380
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 10 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
381 2 avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
382
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 8 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
383 8 avctx->pix_fmt = AV_PIX_FMT_BGRA;
384 ✗ else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
385 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
386 /* give up */
387 else {
388 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
389 "[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
390 ✗ return AVERROR_INVALIDDATA;
391 }
392 }
393
394 /* Set any remaining post-proc that should happen before frame is ready. */
395
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 96 if (alpha_exponent)
396 4 ctx->postproc = DDS_ALPHA_EXP;
397
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 92 else if (normal_map)
398 4 ctx->postproc = DDS_NORMAL_MAP;
399
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 88 else if (ycocg_classic && !ctx->compressed)
400 2 ctx->postproc = DDS_RAW_YCOCG;
401
402 /* ATI/NVidia variants sometimes add swizzling in bpp. */
403
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 96 switch (bpp) {
404 2 case MKTAG('A', '2', 'X', 'Y'):
405 2 ctx->postproc = DDS_SWIZZLE_A2XY;
406 2 break;
407 2 case MKTAG('x', 'G', 'B', 'R'):
408 2 ctx->postproc = DDS_SWIZZLE_XGBR;
409 2 break;
410 2 case MKTAG('x', 'R', 'B', 'G'):
411 2 ctx->postproc = DDS_SWIZZLE_XRBG;
412 2 break;
413 2 case MKTAG('R', 'B', 'x', 'G'):
414 2 ctx->postproc = DDS_SWIZZLE_RBXG;
415 2 break;
416 2 case MKTAG('R', 'G', 'x', 'B'):
417 2 ctx->postproc = DDS_SWIZZLE_RGXB;
418 2 break;
419 2 case MKTAG('R', 'x', 'B', 'G'):
420 2 ctx->postproc = DDS_SWIZZLE_RXBG;
421 2 break;
422 2 case MKTAG('x', 'G', 'x', 'R'):
423 2 ctx->postproc = DDS_SWIZZLE_XGXR;
424 2 break;
425 2 case MKTAG('A', '2', 'D', '5'):
426 2 ctx->postproc = DDS_NORMAL_MAP;
427 2 break;
428 }
429
430 96 return 0;
431 }
432
433 26 static void do_swizzle(AVFrame *frame, int x, int y)
434 {
435 int i;
436
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 106522 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
437 106496 uint8_t *src = frame->data[0] + i;
438 106496 FFSWAP(uint8_t, src[x], src[y]);
439 }
440 26 }
441
442 28 static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
443 {
444 28 DDSContext *ctx = avctx->priv_data;
445 int i, x_off;
446
447
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 28 switch (ctx->postproc) {
448 4 case DDS_ALPHA_EXP:
449 /* Alpha-exponential mode divides each channel by the maximum
450 * R, G or B value, and stores the multiplying factor in the
451 * alpha channel. */
452 4 av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
453
454
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 16388 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
455 16384 uint8_t *src = frame->data[0] + i;
456 16384 int r = src[0];
457 16384 int g = src[1];
458 16384 int b = src[2];
459 16384 int a = src[3];
460
461 16384 src[0] = r * a / 255;
462 16384 src[1] = g * a / 255;
463 16384 src[2] = b * a / 255;
464 16384 src[3] = 255;
465 }
466 4 break;
467 6 case DDS_NORMAL_MAP:
468 /* Normal maps work in the XYZ color space and they encode
469 * X in R or in A, depending on the texture type, Y in G and
470 * derive Z with a square root of the distance.
471 *
472 * http://www.realtimecollisiondetection.net/blog/?p=28 */
473 6 av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
474
475
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 6 x_off = ctx->dec.tex_ratio == 8 ? 0 : 3;
476
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 24582 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
477 24576 uint8_t *src = frame->data[0] + i;
478 24576 int x = src[x_off];
479 24576 int y = src[1];
480 24576 int z = 127;
481
482 24576 int d = (255 * 255 - x * x - y * y) / 2;
483
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 24576 if (d > 0)
484 20740 z = lrint(sqrtf(d));
485
486 24576 src[0] = x;
487 24576 src[1] = y;
488 24576 src[2] = z;
489 24576 src[3] = 255;
490 }
491 6 break;
492 2 case DDS_RAW_YCOCG:
493 /* Data is Y-Co-Cg-A and not RGBA, but they are represented
494 * with the same masks in the DDPF header. */
495 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
496
497
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 8194 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
498 8192 uint8_t *src = frame->data[0] + i;
499 8192 int a = src[0];
500 8192 int cg = src[1] - 128;
501 8192 int co = src[2] - 128;
502 8192 int y = src[3];
503
504 8192 src[0] = av_clip_uint8(y + co - cg);
505 8192 src[1] = av_clip_uint8(y + cg);
506 8192 src[2] = av_clip_uint8(y - co - cg);
507 8192 src[3] = a;
508 }
509 2 break;
510 ✗ case DDS_SWAP_ALPHA:
511 /* Alpha and Luma are stored swapped. */
512 ✗ av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
513
514 ✗ for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
515 ✗ uint8_t *src = frame->data[0] + i;
516 ✗ FFSWAP(uint8_t, src[0], src[1]);
517 }
518 ✗ break;
519 2 case DDS_SWIZZLE_A2XY:
520 /* Swap R and G, often used to restore a standard RGTC2. */
521 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
522 2 do_swizzle(frame, 0, 1);
523 2 break;
524 2 case DDS_SWIZZLE_RBXG:
525 /* Swap G and A, then B and new A (G). */
526 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
527 2 do_swizzle(frame, 1, 3);
528 2 do_swizzle(frame, 2, 3);
529 2 break;
530 2 case DDS_SWIZZLE_RGXB:
531 /* Swap B and A. */
532 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
533 2 do_swizzle(frame, 2, 3);
534 2 break;
535 2 case DDS_SWIZZLE_RXBG:
536 /* Swap G and A. */
537 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
538 2 do_swizzle(frame, 1, 3);
539 2 break;
540 2 case DDS_SWIZZLE_RXGB:
541 /* Swap R and A (misleading name). */
542 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
543 2 do_swizzle(frame, 0, 3);
544 2 break;
545 2 case DDS_SWIZZLE_XGBR:
546 /* Swap B and A, then R and new A (B). */
547 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
548 2 do_swizzle(frame, 2, 3);
549 2 do_swizzle(frame, 0, 3);
550 2 break;
551 2 case DDS_SWIZZLE_XGXR:
552 /* Swap G and A, then R and new A (G), then new R (G) and new G (A).
553 * This variant does not store any B component. */
554 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
555 2 do_swizzle(frame, 1, 3);
556 2 do_swizzle(frame, 0, 3);
557 2 do_swizzle(frame, 0, 1);
558 2 break;
559 2 case DDS_SWIZZLE_XRBG:
560 /* Swap G and A, then R and new A (G). */
561 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
562 2 do_swizzle(frame, 1, 3);
563 2 do_swizzle(frame, 0, 3);
564 2 break;
565 }
566 28 }
567
568 96 static int dds_decode(AVCodecContext *avctx, AVFrame *frame,
569 int *got_frame, AVPacket *avpkt)
570 {
571 96 DDSContext *ctx = avctx->priv_data;
572 96 GetByteContext *gbc = &ctx->gbc;
573 int mipmap;
574 int ret;
575 int width, height;
576
577 96 ff_texturedsp_init(&ctx->texdsp);
578 96 bytestream2_init(gbc, avpkt->data, avpkt->size);
579
580
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 96 if (bytestream2_get_bytes_left(gbc) < 128) {
581 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n",
582 bytestream2_get_bytes_left(gbc));
583 ✗ return AVERROR_INVALIDDATA;
584 }
585
586
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 192 if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
587 96 bytestream2_get_le32(gbc) != 124) { // header size
588 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.\n");
589 ✗ return AVERROR_INVALIDDATA;
590 }
591
592 96 bytestream2_skip(gbc, 4); // flags
593
594 96 height = bytestream2_get_le32(gbc);
595 96 width = bytestream2_get_le32(gbc);
596 96 ret = ff_set_dimensions(avctx, width, height);
597
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 96 if (ret < 0) {
598 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
599 avctx->width, avctx->height);
600 ✗ return ret;
601 }
602
603 /* Since codec is based on 4x4 blocks, size is aligned to 4. */
604 96 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
605 96 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
606
607 96 bytestream2_skip(gbc, 4); // pitch
608 96 bytestream2_skip(gbc, 4); // depth
609 96 mipmap = bytestream2_get_le32(gbc);
610
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 96 if (mipmap != 0)
611 56 av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
612
613 /* Extract pixel format information, considering additional elements
614 * in reserved1 and reserved2. */
615 96 ret = parse_pixel_format(avctx);
616
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 96 if (ret < 0)
617 ✗ return ret;
618
619 96 ret = ff_get_buffer(avctx, frame, 0);
620
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 96 if (ret < 0)
621 ✗ return ret;
622
623
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 96 if (ctx->compressed) {
624 60 int size = (avctx->coded_height / TEXTURE_BLOCK_H) *
625 60 (avctx->coded_width / TEXTURE_BLOCK_W) * ctx->dec.tex_ratio;
626 60 ctx->dec.slice_count = av_clip(avctx->thread_count, 1,
627 60 avctx->coded_height / TEXTURE_BLOCK_H);
628
629
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 60 if (bytestream2_get_bytes_left(gbc) < size) {
630 ✗ av_log(avctx, AV_LOG_ERROR,
631 "Compressed Buffer is too small (%d < %d).\n",
632 bytestream2_get_bytes_left(gbc), size);
633 ✗ return AVERROR_INVALIDDATA;
634 }
635
636 /* Use the decompress function on the texture, one block per thread. */
637 60 ctx->dec.tex_data.in = gbc->buffer;
638 60 ctx->dec.frame_data.out = frame->data[0];
639 60 ctx->dec.stride = frame->linesize[0];
640 60 avctx->execute2(avctx, ff_texturedsp_decompress_thread, &ctx->dec, NULL, ctx->dec.slice_count);
641
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 36 } else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
642 ✗ uint8_t *dst = frame->data[0];
643 int x, y, i;
644
645 /* Use the first 64 bytes as palette, then copy the rest. */
646 ✗ bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
647 ✗ for (i = 0; i < 16; i++) {
648 ✗ AV_WN32(frame->data[1] + i*4,
649 (frame->data[1][2+i*4]<<0)+
650 (frame->data[1][1+i*4]<<8)+
651 (frame->data[1][0+i*4]<<16)+
652 ((unsigned)frame->data[1][3+i*4]<<24)
653 );
654 }
655 ✗ frame->palette_has_changed = 1;
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 4 frame->palette_has_changed = 1;
687 }
688
689
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 36 if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
690 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
691 ✗ bytestream2_get_bytes_left(gbc), frame->height * linesize);
692 ✗ return AVERROR_INVALIDDATA;
693 }
694
695 36 av_image_copy_plane(frame->data[0], frame->linesize[0],
696 gbc->buffer, linesize,
697 linesize, frame->height);
698 }
699
700 /* Run any post processing here if needed. */
701
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 96 if (ctx->postproc != DDS_NONE)
702 28 run_postproc(avctx, frame);
703
704 /* Frame is ready to be output. */
705 96 frame->pict_type = AV_PICTURE_TYPE_I;
706 96 frame->key_frame = 1;
707 96 *got_frame = 1;
708
709 96 return avpkt->size;
710 }
711
712 const FFCodec ff_dds_decoder = {
713 .p.name = "dds",
714 .p.long_name = NULL_IF_CONFIG_SMALL("DirectDraw Surface image decoder"),
715 .p.type = AVMEDIA_TYPE_VIDEO,
716 .p.id = AV_CODEC_ID_DDS,
717 FF_CODEC_DECODE_CB(dds_decode),
718 .priv_data_size = sizeof(DDSContext),
719 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
720 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE
721 };
722