FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dds.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 342 436 78.4%
Branches: 173 273 63.4%
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 "internal.h"
37 #include "texturedsp.h"
38 #include "thread.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 const uint8_t *tex_data; // Compressed texture
109 int tex_ratio; // Compression ratio
110 int slice_count; // Number of slices for threaded operations
111
112 /* Pointer to the selected compress or decompress function. */
113 int (*tex_funct)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
114 } DDSContext;
115
116 96 static int parse_pixel_format(AVCodecContext *avctx)
117 {
118 96 DDSContext *ctx = avctx->priv_data;
119 96 GetByteContext *gbc = &ctx->gbc;
120 uint32_t flags, fourcc, gimp_tag;
121 enum DDSDXGIFormat dxgi;
122 int size, bpp, r, g, b, a;
123 int alpha_exponent, ycocg_classic, ycocg_scaled, normal_map, array;
124
125 /* Alternative DDS implementations use reserved1 as custom header. */
126 96 bytestream2_skip(gbc, 4 * 3);
127 96 gimp_tag = bytestream2_get_le32(gbc);
128 96 alpha_exponent = gimp_tag == MKTAG('A', 'E', 'X', 'P');
129 96 ycocg_classic = gimp_tag == MKTAG('Y', 'C', 'G', '1');
130 96 ycocg_scaled = gimp_tag == MKTAG('Y', 'C', 'G', '2');
131 96 bytestream2_skip(gbc, 4 * 7);
132
133 /* Now the real DDPF starts. */
134 96 size = bytestream2_get_le32(gbc);
135
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 96 if (size != 32) {
136 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
137 ✗ return AVERROR_INVALIDDATA;
138 }
139 96 flags = bytestream2_get_le32(gbc);
140 96 ctx->compressed = flags & DDPF_FOURCC;
141 96 ctx->paletted = flags & DDPF_PALETTE;
142 96 normal_map = flags & DDPF_NORMALMAP;
143 96 fourcc = bytestream2_get_le32(gbc);
144
145
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 96 if (ctx->compressed && ctx->paletted) {
146 ✗ av_log(avctx, AV_LOG_WARNING,
147 "Disabling invalid palette flag for compressed dds.\n");
148 ✗ ctx->paletted = 0;
149 }
150
151 96 bpp = ctx->bpp = bytestream2_get_le32(gbc); // rgbbitcount
152 96 r = bytestream2_get_le32(gbc); // rbitmask
153 96 g = bytestream2_get_le32(gbc); // gbitmask
154 96 b = bytestream2_get_le32(gbc); // bbitmask
155 96 a = bytestream2_get_le32(gbc); // abitmask
156
157 96 bytestream2_skip(gbc, 4); // caps
158 96 bytestream2_skip(gbc, 4); // caps2
159 96 bytestream2_skip(gbc, 4); // caps3
160 96 bytestream2_skip(gbc, 4); // caps4
161 96 bytestream2_skip(gbc, 4); // reserved2
162
163 96 av_log(avctx, AV_LOG_VERBOSE, "fourcc %s bpp %d "
164 96 "r 0x%x g 0x%x b 0x%x a 0x%x\n", av_fourcc2str(fourcc), bpp, r, g, b, a);
165
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 96 if (gimp_tag)
166 10 av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", av_fourcc2str(gimp_tag));
167
168
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 96 if (ctx->compressed)
169 68 avctx->pix_fmt = AV_PIX_FMT_RGBA;
170
171
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 96 if (ctx->compressed) {
172
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 68 switch (fourcc) {
173 6 case MKTAG('D', 'X', 'T', '1'):
174 6 ctx->tex_ratio = 8;
175 6 ctx->tex_funct = ctx->texdsp.dxt1a_block;
176 68 break;
177 2 case MKTAG('D', 'X', 'T', '2'):
178 2 ctx->tex_ratio = 16;
179 2 ctx->tex_funct = ctx->texdsp.dxt2_block;
180 2 break;
181 2 case MKTAG('D', 'X', 'T', '3'):
182 2 ctx->tex_ratio = 16;
183 2 ctx->tex_funct = ctx->texdsp.dxt3_block;
184 2 break;
185 2 case MKTAG('D', 'X', 'T', '4'):
186 2 ctx->tex_ratio = 16;
187 2 ctx->tex_funct = ctx->texdsp.dxt4_block;
188 2 break;
189 24 case MKTAG('D', 'X', 'T', '5'):
190 24 ctx->tex_ratio = 16;
191
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 24 if (ycocg_scaled)
192 2 ctx->tex_funct = ctx->texdsp.dxt5ys_block;
193
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 22 else if (ycocg_classic)
194 2 ctx->tex_funct = ctx->texdsp.dxt5y_block;
195 else
196 20 ctx->tex_funct = ctx->texdsp.dxt5_block;
197 24 break;
198 2 case MKTAG('R', 'X', 'G', 'B'):
199 2 ctx->tex_ratio = 16;
200 2 ctx->tex_funct = ctx->texdsp.dxt5_block;
201 /* This format may be considered as a normal map,
202 * but it is handled differently in a separate postproc. */
203 2 ctx->postproc = DDS_SWIZZLE_RXGB;
204 2 normal_map = 0;
205 2 break;
206 2 case MKTAG('A', 'T', 'I', '1'):
207 case MKTAG('B', 'C', '4', 'U'):
208 2 ctx->tex_ratio = 8;
209 2 ctx->tex_funct = ctx->texdsp.rgtc1u_block;
210 2 break;
211 2 case MKTAG('B', 'C', '4', 'S'):
212 2 ctx->tex_ratio = 8;
213 2 ctx->tex_funct = ctx->texdsp.rgtc1s_block;
214 2 break;
215 4 case MKTAG('A', 'T', 'I', '2'):
216 /* RGT2 variant with swapped R and G (3Dc)*/
217 4 ctx->tex_ratio = 16;
218 4 ctx->tex_funct = ctx->texdsp.dxn3dc_block;
219 4 break;
220 ✗ case MKTAG('B', 'C', '5', 'U'):
221 ✗ ctx->tex_ratio = 16;
222 ✗ ctx->tex_funct = ctx->texdsp.rgtc2u_block;
223 ✗ break;
224 2 case MKTAG('B', 'C', '5', 'S'):
225 2 ctx->tex_ratio = 16;
226 2 ctx->tex_funct = ctx->texdsp.rgtc2s_block;
227 2 break;
228 2 case MKTAG('U', 'Y', 'V', 'Y'):
229 2 ctx->compressed = 0;
230 2 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
231 2 break;
232 2 case MKTAG('Y', 'U', 'Y', '2'):
233 2 ctx->compressed = 0;
234 2 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
235 2 break;
236 2 case MKTAG('P', '8', ' ', ' '):
237 /* ATI Palette8, same as normal palette */
238 2 ctx->compressed = 0;
239 2 ctx->paletted = 1;
240 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
241 2 break;
242 2 case MKTAG('G', '1', ' ', ' '):
243 2 ctx->compressed = 0;
244 2 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
245 2 break;
246 12 case MKTAG('D', 'X', '1', '0'):
247 /* DirectX 10 extra header */
248 12 dxgi = bytestream2_get_le32(gbc);
249 12 bytestream2_skip(gbc, 4); // resourceDimension
250 12 bytestream2_skip(gbc, 4); // miscFlag
251 12 array = bytestream2_get_le32(gbc);
252 12 bytestream2_skip(gbc, 4); // miscFlag2
253
254
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 12 if (array != 0)
255 12 av_log(avctx, AV_LOG_VERBOSE,
256 "Found array of size %d (ignored).\n", array);
257
258 /* Only BC[1-5] are actually compressed. */
259
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 12 ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
260
261 12 av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
262 switch (dxgi) {
263 /* RGB types. */
264 ✗ case DXGI_FORMAT_R16G16B16A16_TYPELESS:
265 case DXGI_FORMAT_R16G16B16A16_FLOAT:
266 case DXGI_FORMAT_R16G16B16A16_UNORM:
267 case DXGI_FORMAT_R16G16B16A16_UINT:
268 case DXGI_FORMAT_R16G16B16A16_SNORM:
269 case DXGI_FORMAT_R16G16B16A16_SINT:
270 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA64;
271 ✗ break;
272 ✗ case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
273 ✗ avctx->colorspace = AVCOL_SPC_RGB;
274 ✗ case DXGI_FORMAT_R8G8B8A8_TYPELESS:
275 case DXGI_FORMAT_R8G8B8A8_UNORM:
276 case DXGI_FORMAT_R8G8B8A8_UINT:
277 case DXGI_FORMAT_R8G8B8A8_SNORM:
278 case DXGI_FORMAT_R8G8B8A8_SINT:
279 ✗ avctx->pix_fmt = AV_PIX_FMT_BGRA;
280 ✗ break;
281 ✗ case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
282 ✗ avctx->colorspace = AVCOL_SPC_RGB;
283 ✗ case DXGI_FORMAT_B8G8R8A8_TYPELESS:
284 case DXGI_FORMAT_B8G8R8A8_UNORM:
285 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
286 ✗ break;
287 ✗ case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
288 ✗ avctx->colorspace = AVCOL_SPC_RGB;
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 4 case DXGI_FORMAT_BC1_TYPELESS:
300 case DXGI_FORMAT_BC1_UNORM:
301 4 ctx->tex_ratio = 8;
302 4 ctx->tex_funct = ctx->texdsp.dxt1a_block;
303 4 break;
304 ✗ case DXGI_FORMAT_BC2_UNORM_SRGB:
305 ✗ avctx->colorspace = AVCOL_SPC_RGB;
306 2 case DXGI_FORMAT_BC2_TYPELESS:
307 case DXGI_FORMAT_BC2_UNORM:
308 2 ctx->tex_ratio = 16;
309 2 ctx->tex_funct = ctx->texdsp.dxt3_block;
310 2 break;
311 ✗ case DXGI_FORMAT_BC3_UNORM_SRGB:
312 ✗ avctx->colorspace = AVCOL_SPC_RGB;
313 2 case DXGI_FORMAT_BC3_TYPELESS:
314 case DXGI_FORMAT_BC3_UNORM:
315 2 ctx->tex_ratio = 16;
316 2 ctx->tex_funct = ctx->texdsp.dxt5_block;
317 2 break;
318 2 case DXGI_FORMAT_BC4_TYPELESS:
319 case DXGI_FORMAT_BC4_UNORM:
320 2 ctx->tex_ratio = 8;
321 2 ctx->tex_funct = ctx->texdsp.rgtc1u_block;
322 2 break;
323 ✗ case DXGI_FORMAT_BC4_SNORM:
324 ✗ ctx->tex_ratio = 8;
325 ✗ ctx->tex_funct = ctx->texdsp.rgtc1s_block;
326 ✗ break;
327 2 case DXGI_FORMAT_BC5_TYPELESS:
328 case DXGI_FORMAT_BC5_UNORM:
329 2 ctx->tex_ratio = 16;
330 2 ctx->tex_funct = ctx->texdsp.rgtc2u_block;
331 2 break;
332 ✗ case DXGI_FORMAT_BC5_SNORM:
333 ✗ ctx->tex_ratio = 16;
334 ✗ ctx->tex_funct = ctx->texdsp.rgtc2s_block;
335 ✗ break;
336 ✗ default:
337 ✗ av_log(avctx, AV_LOG_ERROR,
338 "Unsupported DXGI format %d.\n", dxgi);
339 ✗ return AVERROR_INVALIDDATA;
340 }
341 12 break;
342 ✗ default:
343 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", av_fourcc2str(fourcc));
344 ✗ return AVERROR_INVALIDDATA;
345 }
346
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 28 } else if (ctx->paletted) {
347
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 2 if (bpp == 8) {
348 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
349 } else {
350 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
351 ✗ return AVERROR_INVALIDDATA;
352 }
353 } else {
354 /* 4 bpp */
355
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 26 if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
356 ✗ avctx->pix_fmt = AV_PIX_FMT_PAL8;
357 /* 8 bpp */
358
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 26 else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
359 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
360
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 24 else if (bpp == 8 && r == 0 && g == 0 && b == 0 && a == 0xff)
361 2 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
362 /* 16 bpp */
363
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 22 else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
364 2 avctx->pix_fmt = AV_PIX_FMT_YA8;
365
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 20 else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
366 ✗ avctx->pix_fmt = AV_PIX_FMT_YA8;
367 ✗ ctx->postproc = DDS_SWAP_ALPHA;
368 }
369
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 20 else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
370 ✗ avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
371
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 20 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
372 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
373
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 18 else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0x8000)
374 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE; // alpha ignored
375
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 16 else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
376 2 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
377 /* 24 bpp */
378
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 14 else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
379 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
380 /* 32 bpp */
381
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 12 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
382 2 avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
383
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 10 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
384 2 avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
385
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 8 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
386 8 avctx->pix_fmt = AV_PIX_FMT_BGRA;
387 ✗ else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
388 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA;
389 /* give up */
390 else {
391 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
392 "[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
393 ✗ return AVERROR_INVALIDDATA;
394 }
395 }
396
397 /* Set any remaining post-proc that should happen before frame is ready. */
398
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 96 if (alpha_exponent)
399 4 ctx->postproc = DDS_ALPHA_EXP;
400
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 92 else if (normal_map)
401 4 ctx->postproc = DDS_NORMAL_MAP;
402
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 88 else if (ycocg_classic && !ctx->compressed)
403 2 ctx->postproc = DDS_RAW_YCOCG;
404
405 /* ATI/NVidia variants sometimes add swizzling in bpp. */
406
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 96 switch (bpp) {
407 2 case MKTAG('A', '2', 'X', 'Y'):
408 2 ctx->postproc = DDS_SWIZZLE_A2XY;
409 2 break;
410 2 case MKTAG('x', 'G', 'B', 'R'):
411 2 ctx->postproc = DDS_SWIZZLE_XGBR;
412 2 break;
413 2 case MKTAG('x', 'R', 'B', 'G'):
414 2 ctx->postproc = DDS_SWIZZLE_XRBG;
415 2 break;
416 2 case MKTAG('R', 'B', 'x', 'G'):
417 2 ctx->postproc = DDS_SWIZZLE_RBXG;
418 2 break;
419 2 case MKTAG('R', 'G', 'x', 'B'):
420 2 ctx->postproc = DDS_SWIZZLE_RGXB;
421 2 break;
422 2 case MKTAG('R', 'x', 'B', 'G'):
423 2 ctx->postproc = DDS_SWIZZLE_RXBG;
424 2 break;
425 2 case MKTAG('x', 'G', 'x', 'R'):
426 2 ctx->postproc = DDS_SWIZZLE_XGXR;
427 2 break;
428 2 case MKTAG('A', '2', 'D', '5'):
429 2 ctx->postproc = DDS_NORMAL_MAP;
430 2 break;
431 }
432
433 96 return 0;
434 }
435
436 60 static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
437 int slice, int thread_nb)
438 {
439 60 DDSContext *ctx = avctx->priv_data;
440 60 AVFrame *frame = arg;
441 60 const uint8_t *d = ctx->tex_data;
442 60 int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
443 60 int h_block = avctx->coded_height / TEXTURE_BLOCK_H;
444 int x, y;
445 int start_slice, end_slice;
446 60 int base_blocks_per_slice = h_block / ctx->slice_count;
447 60 int remainder_blocks = h_block % ctx->slice_count;
448
449 /* When the frame height (in blocks) doesn't divide evenly between the
450 * number of slices, spread the remaining blocks evenly between the first
451 * operations */
452 60 start_slice = slice * base_blocks_per_slice;
453 /* Add any extra blocks (one per slice) that have been added before this slice */
454 60 start_slice += FFMIN(slice, remainder_blocks);
455
456 60 end_slice = start_slice + base_blocks_per_slice;
457 /* Add an extra block if there are still remainder blocks to be accounted for */
458
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 60 if (slice < remainder_blocks)
459 ✗ end_slice++;
460
461
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 1020 for (y = start_slice; y < end_slice; y++) {
462 960 uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
463 960 int off = y * w_block;
464
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 16832 for (x = 0; x < w_block; x++) {
465 15872 ctx->tex_funct(p + x * 16, frame->linesize[0],
466 15872 d + (off + x) * ctx->tex_ratio);
467 }
468 }
469
470 60 return 0;
471 }
472
473 26 static void do_swizzle(AVFrame *frame, int x, int y)
474 {
475 int i;
476
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 106522 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
477 106496 uint8_t *src = frame->data[0] + i;
478 106496 FFSWAP(uint8_t, src[x], src[y]);
479 }
480 26 }
481
482 28 static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
483 {
484 28 DDSContext *ctx = avctx->priv_data;
485 int i, x_off;
486
487
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 28 switch (ctx->postproc) {
488 4 case DDS_ALPHA_EXP:
489 /* Alpha-exponential mode divides each channel by the maximum
490 * R, G or B value, and stores the multiplying factor in the
491 * alpha channel. */
492 4 av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
493
494
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 16388 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
495 16384 uint8_t *src = frame->data[0] + i;
496 16384 int r = src[0];
497 16384 int g = src[1];
498 16384 int b = src[2];
499 16384 int a = src[3];
500
501 16384 src[0] = r * a / 255;
502 16384 src[1] = g * a / 255;
503 16384 src[2] = b * a / 255;
504 16384 src[3] = 255;
505 }
506 4 break;
507 6 case DDS_NORMAL_MAP:
508 /* Normal maps work in the XYZ color space and they encode
509 * X in R or in A, depending on the texture type, Y in G and
510 * derive Z with a square root of the distance.
511 *
512 * http://www.realtimecollisiondetection.net/blog/?p=28 */
513 6 av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
514
515
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 6 x_off = ctx->tex_ratio == 8 ? 0 : 3;
516
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 24582 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
517 24576 uint8_t *src = frame->data[0] + i;
518 24576 int x = src[x_off];
519 24576 int y = src[1];
520 24576 int z = 127;
521
522 24576 int d = (255 * 255 - x * x - y * y) / 2;
523
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 24576 if (d > 0)
524 20740 z = lrint(sqrtf(d));
525
526 24576 src[0] = x;
527 24576 src[1] = y;
528 24576 src[2] = z;
529 24576 src[3] = 255;
530 }
531 6 break;
532 2 case DDS_RAW_YCOCG:
533 /* Data is Y-Co-Cg-A and not RGBA, but they are represented
534 * with the same masks in the DDPF header. */
535 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
536
537
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 8194 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
538 8192 uint8_t *src = frame->data[0] + i;
539 8192 int a = src[0];
540 8192 int cg = src[1] - 128;
541 8192 int co = src[2] - 128;
542 8192 int y = src[3];
543
544 8192 src[0] = av_clip_uint8(y + co - cg);
545 8192 src[1] = av_clip_uint8(y + cg);
546 8192 src[2] = av_clip_uint8(y - co - cg);
547 8192 src[3] = a;
548 }
549 2 break;
550 ✗ case DDS_SWAP_ALPHA:
551 /* Alpha and Luma are stored swapped. */
552 ✗ av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
553
554 ✗ for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
555 ✗ uint8_t *src = frame->data[0] + i;
556 ✗ FFSWAP(uint8_t, src[0], src[1]);
557 }
558 ✗ break;
559 2 case DDS_SWIZZLE_A2XY:
560 /* Swap R and G, often used to restore a standard RGTC2. */
561 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
562 2 do_swizzle(frame, 0, 1);
563 2 break;
564 2 case DDS_SWIZZLE_RBXG:
565 /* Swap G and A, then B and new A (G). */
566 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
567 2 do_swizzle(frame, 1, 3);
568 2 do_swizzle(frame, 2, 3);
569 2 break;
570 2 case DDS_SWIZZLE_RGXB:
571 /* Swap B and A. */
572 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
573 2 do_swizzle(frame, 2, 3);
574 2 break;
575 2 case DDS_SWIZZLE_RXBG:
576 /* Swap G and A. */
577 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
578 2 do_swizzle(frame, 1, 3);
579 2 break;
580 2 case DDS_SWIZZLE_RXGB:
581 /* Swap R and A (misleading name). */
582 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
583 2 do_swizzle(frame, 0, 3);
584 2 break;
585 2 case DDS_SWIZZLE_XGBR:
586 /* Swap B and A, then R and new A (B). */
587 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
588 2 do_swizzle(frame, 2, 3);
589 2 do_swizzle(frame, 0, 3);
590 2 break;
591 2 case DDS_SWIZZLE_XGXR:
592 /* Swap G and A, then R and new A (G), then new R (G) and new G (A).
593 * This variant does not store any B component. */
594 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
595 2 do_swizzle(frame, 1, 3);
596 2 do_swizzle(frame, 0, 3);
597 2 do_swizzle(frame, 0, 1);
598 2 break;
599 2 case DDS_SWIZZLE_XRBG:
600 /* Swap G and A, then R and new A (G). */
601 2 av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
602 2 do_swizzle(frame, 1, 3);
603 2 do_swizzle(frame, 0, 3);
604 2 break;
605 }
606 28 }
607
608 96 static int dds_decode(AVCodecContext *avctx, void *data,
609 int *got_frame, AVPacket *avpkt)
610 {
611 96 DDSContext *ctx = avctx->priv_data;
612 96 GetByteContext *gbc = &ctx->gbc;
613 96 AVFrame *frame = data;
614 int mipmap;
615 int ret;
616 int width, height;
617
618 96 ff_texturedsp_init(&ctx->texdsp);
619 96 bytestream2_init(gbc, avpkt->data, avpkt->size);
620
621
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 96 if (bytestream2_get_bytes_left(gbc) < 128) {
622 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n",
623 bytestream2_get_bytes_left(gbc));
624 ✗ return AVERROR_INVALIDDATA;
625 }
626
627
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 192 if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
628 96 bytestream2_get_le32(gbc) != 124) { // header size
629 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.\n");
630 ✗ return AVERROR_INVALIDDATA;
631 }
632
633 96 bytestream2_skip(gbc, 4); // flags
634
635 96 height = bytestream2_get_le32(gbc);
636 96 width = bytestream2_get_le32(gbc);
637 96 ret = ff_set_dimensions(avctx, width, height);
638
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 96 if (ret < 0) {
639 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
640 avctx->width, avctx->height);
641 ✗ return ret;
642 }
643
644 /* Since codec is based on 4x4 blocks, size is aligned to 4. */
645 96 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
646 96 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
647
648 96 bytestream2_skip(gbc, 4); // pitch
649 96 bytestream2_skip(gbc, 4); // depth
650 96 mipmap = bytestream2_get_le32(gbc);
651
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 96 if (mipmap != 0)
652 56 av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
653
654 /* Extract pixel format information, considering additional elements
655 * in reserved1 and reserved2. */
656 96 ret = parse_pixel_format(avctx);
657
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 96 if (ret < 0)
658 ✗ return ret;
659
660 96 ret = ff_get_buffer(avctx, frame, 0);
661
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 96 if (ret < 0)
662 ✗ return ret;
663
664
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 96 if (ctx->compressed) {
665 60 int size = (avctx->coded_height / TEXTURE_BLOCK_H) *
666 60 (avctx->coded_width / TEXTURE_BLOCK_W) * ctx->tex_ratio;
667 60 ctx->slice_count = av_clip(avctx->thread_count, 1,
668 60 avctx->coded_height / TEXTURE_BLOCK_H);
669
670
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 60 if (bytestream2_get_bytes_left(gbc) < size) {
671 ✗ av_log(avctx, AV_LOG_ERROR,
672 "Compressed Buffer is too small (%d < %d).\n",
673 bytestream2_get_bytes_left(gbc), size);
674 ✗ return AVERROR_INVALIDDATA;
675 }
676
677 /* Use the decompress function on the texture, one block per thread. */
678 60 ctx->tex_data = gbc->buffer;
679 60 avctx->execute2(avctx, decompress_texture_thread, frame, NULL, ctx->slice_count);
680
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 36 } else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
681 ✗ uint8_t *dst = frame->data[0];
682 int x, y, i;
683
684 /* Use the first 64 bytes as palette, then copy the rest. */
685 ✗ bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
686 ✗ for (i = 0; i < 16; i++) {
687 ✗ AV_WN32(frame->data[1] + i*4,
688 (frame->data[1][2+i*4]<<0)+
689 (frame->data[1][1+i*4]<<8)+
690 (frame->data[1][0+i*4]<<16)+
691 ((unsigned)frame->data[1][3+i*4]<<24)
692 );
693 }
694 ✗ frame->palette_has_changed = 1;
695
696 ✗ if (bytestream2_get_bytes_left(gbc) < frame->height * frame->width / 2) {
697 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
698 ✗ bytestream2_get_bytes_left(gbc), frame->height * frame->width / 2);
699 ✗ return AVERROR_INVALIDDATA;
700 }
701
702 ✗ for (y = 0; y < frame->height; y++) {
703 ✗ for (x = 0; x < frame->width; x += 2) {
704 ✗ uint8_t val = bytestream2_get_byte(gbc);
705 ✗ dst[x ] = val & 0xF;
706 ✗ dst[x + 1] = val >> 4;
707 }
708 ✗ dst += frame->linesize[0];
709 }
710 } else {
711 36 int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
712
713
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 36 if (ctx->paletted) {
714 int i;
715 /* Use the first 1024 bytes as palette, then copy the rest. */
716 4 bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
717
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 1028 for (i = 0; i < 256; i++)
718 1024 AV_WN32(frame->data[1] + i*4,
719 (frame->data[1][2+i*4]<<0)+
720 (frame->data[1][1+i*4]<<8)+
721 (frame->data[1][0+i*4]<<16)+
722 ((unsigned)frame->data[1][3+i*4]<<24)
723 );
724
725 4 frame->palette_has_changed = 1;
726 }
727
728
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 36 if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
729 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
730 ✗ bytestream2_get_bytes_left(gbc), frame->height * linesize);
731 ✗ return AVERROR_INVALIDDATA;
732 }
733
734 36 av_image_copy_plane(frame->data[0], frame->linesize[0],
735 gbc->buffer, linesize,
736 linesize, frame->height);
737 }
738
739 /* Run any post processing here if needed. */
740
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 96 if (ctx->postproc != DDS_NONE)
741 28 run_postproc(avctx, frame);
742
743 /* Frame is ready to be output. */
744 96 frame->pict_type = AV_PICTURE_TYPE_I;
745 96 frame->key_frame = 1;
746 96 *got_frame = 1;
747
748 96 return avpkt->size;
749 }
750
751 const AVCodec ff_dds_decoder = {
752 .name = "dds",
753 .long_name = NULL_IF_CONFIG_SMALL("DirectDraw Surface image decoder"),
754 .type = AVMEDIA_TYPE_VIDEO,
755 .id = AV_CODEC_ID_DDS,
756 .decode = dds_decode,
757 .priv_data_size = sizeof(DDSContext),
758 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
759 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE
760 };
761