projects / libav.git / blob
? search:


0f045d6a07860b1ce6d9cf4730d508ff55ca9ae7
[libav.git] / libavcodec / dds.c
1 /*
2 * DirectDraw Surface image decoder
3 * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/imgutils.h"
32
33 #include "avcodec.h"
34 #include "bytestream.h"
35 #include "internal.h"
36 #include "texturedsp.h"
37 #include "thread.h"
38
39 #define DDPF_FOURCC (1 << 2)
40 #define DDPF_PALETTE (1 << 5)
41 #define DDPF_NORMALMAP (1 << 31)
42
43 enum DDSPostProc {
44 DDS_NONE = 0,
45 DDS_ALPHA_EXP,
46 DDS_NORMAL_MAP,
47 DDS_RAW_YCOCG,
48 DDS_SWAP_ALPHA,
49 DDS_SWIZZLE_A2XY,
50 DDS_SWIZZLE_RBXG,
51 DDS_SWIZZLE_RGXB,
52 DDS_SWIZZLE_RXBG,
53 DDS_SWIZZLE_RXGB,
54 DDS_SWIZZLE_XGBR,
55 DDS_SWIZZLE_XRBG,
56 DDS_SWIZZLE_XGXR,
57 };
58
59 enum DDSDXGIFormat {
60 DXGI_FORMAT_R16G16B16A16_TYPELESS = 9,
61 DXGI_FORMAT_R16G16B16A16_FLOAT = 10,
62 DXGI_FORMAT_R16G16B16A16_UNORM = 11,
63 DXGI_FORMAT_R16G16B16A16_UINT = 12,
64 DXGI_FORMAT_R16G16B16A16_SNORM = 13,
65 DXGI_FORMAT_R16G16B16A16_SINT = 14,
66
67 DXGI_FORMAT_R8G8B8A8_TYPELESS = 27,
68 DXGI_FORMAT_R8G8B8A8_UNORM = 28,
69 DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29,
70 DXGI_FORMAT_R8G8B8A8_UINT = 30,
71 DXGI_FORMAT_R8G8B8A8_SNORM = 31,
72 DXGI_FORMAT_R8G8B8A8_SINT = 32,
73
74 DXGI_FORMAT_BC1_TYPELESS = 70,
75 DXGI_FORMAT_BC1_UNORM = 71,
76 DXGI_FORMAT_BC1_UNORM_SRGB = 72,
77 DXGI_FORMAT_BC2_TYPELESS = 73,
78 DXGI_FORMAT_BC2_UNORM = 74,
79 DXGI_FORMAT_BC2_UNORM_SRGB = 75,
80 DXGI_FORMAT_BC3_TYPELESS = 76,
81 DXGI_FORMAT_BC3_UNORM = 77,
82 DXGI_FORMAT_BC3_UNORM_SRGB = 78,
83 DXGI_FORMAT_BC4_TYPELESS = 79,
84 DXGI_FORMAT_BC4_UNORM = 80,
85 DXGI_FORMAT_BC4_SNORM = 81,
86 DXGI_FORMAT_BC5_TYPELESS = 82,
87 DXGI_FORMAT_BC5_UNORM = 83,
88 DXGI_FORMAT_BC5_SNORM = 84,
89 DXGI_FORMAT_B5G6R5_UNORM = 85,
90 DXGI_FORMAT_B8G8R8A8_UNORM = 87,
91 DXGI_FORMAT_B8G8R8X8_UNORM = 88,
92 DXGI_FORMAT_B8G8R8A8_TYPELESS = 90,
93 DXGI_FORMAT_B8G8R8A8_UNORM_SRGB = 91,
94 DXGI_FORMAT_B8G8R8X8_TYPELESS = 92,
95 DXGI_FORMAT_B8G8R8X8_UNORM_SRGB = 93,
96 };
97
98 typedef struct DDSContext {
99 TextureDSPContext texdsp;
100 GetByteContext gbc;
101
102 int compressed;
103 int paletted;
104 enum DDSPostProc postproc;
105
106 const uint8_t *tex_data; // Compressed texture
107 int tex_ratio; // Compression ratio
108 int slice_count; // Number of slices for threaded operations
109
110 /* Pointer to the selected compress or decompress function. */
111 int (*tex_funct)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
112 } DDSContext;
113
114 static int parse_pixel_format(AVCodecContext *avctx)
115 {
116 DDSContext *ctx = avctx->priv_data;
117 GetByteContext *gbc = &ctx->gbc;
118 char buf[32];
119 uint32_t flags, fourcc, gimp_tag;
120 enum DDSDXGIFormat dxgi;
121 int size, bpp, r, g, b, a;
122 int alpha_exponent, ycocg_classic, ycocg_scaled, normal_map, array;
123
124 /* Alternative DDS implementations use reserved1 as custom header. */
125 bytestream2_skip(gbc, 4 * 3);
126 gimp_tag = bytestream2_get_le32(gbc);
127 alpha_exponent = gimp_tag == MKTAG('A', 'E', 'X', 'P');
128 ycocg_classic = gimp_tag == MKTAG('Y', 'C', 'G', '1');
129 ycocg_scaled = gimp_tag == MKTAG('Y', 'C', 'G', '2');
130 bytestream2_skip(gbc, 4 * 7);
131
132 /* Now the real DDPF starts. */
133 size = bytestream2_get_le32(gbc);
134 if (size != 32) {
135 av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
136 return AVERROR_INVALIDDATA;
137 }
138 flags = bytestream2_get_le32(gbc);
139 ctx->compressed = flags & DDPF_FOURCC;
140 ctx->paletted = flags & DDPF_PALETTE;
141 normal_map = flags & DDPF_NORMALMAP;
142 fourcc = bytestream2_get_le32(gbc);
143
144 bpp = bytestream2_get_le32(gbc); // rgbbitcount
145 r = bytestream2_get_le32(gbc); // rbitmask
146 g = bytestream2_get_le32(gbc); // gbitmask
147 b = bytestream2_get_le32(gbc); // bbitmask
148 a = bytestream2_get_le32(gbc); // abitmask
149
150 bytestream2_skip(gbc, 4); // caps
151 bytestream2_skip(gbc, 4); // caps2
152 bytestream2_skip(gbc, 4); // caps3
153 bytestream2_skip(gbc, 4); // caps4
154 bytestream2_skip(gbc, 4); // reserved2
155
156 av_get_codec_tag_string(buf, sizeof(buf), fourcc);
157 av_log(avctx, AV_LOG_VERBOSE, "fourcc %s bpp %d "
158 "r 0x%x g 0x%x b 0x%x a 0x%x\n", buf, bpp, r, g, b, a);
159 if (gimp_tag) {
160 av_get_codec_tag_string(buf, sizeof(buf), gimp_tag);
161 av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", buf);
162 }
163
164 if (ctx->compressed)
165 avctx->pix_fmt = AV_PIX_FMT_RGBA;
166
167 if (ctx->compressed) {
168 switch (fourcc) {
169 case MKTAG('D', 'X', 'T', '1'):
170 ctx->tex_ratio = 8;
171 ctx->tex_funct = ctx->texdsp.dxt1a_block;
172 break;
173 case MKTAG('D', 'X', 'T', '2'):
174 ctx->tex_ratio = 16;
175 ctx->tex_funct = ctx->texdsp.dxt2_block;
176 break;
177 case MKTAG('D', 'X', 'T', '3'):
178 ctx->tex_ratio = 16;
179 ctx->tex_funct = ctx->texdsp.dxt3_block;
180 break;
181 case MKTAG('D', 'X', 'T', '4'):
182 ctx->tex_ratio = 16;
183 ctx->tex_funct = ctx->texdsp.dxt4_block;
184 break;
185 case MKTAG('D', 'X', 'T', '5'):
186 ctx->tex_ratio = 16;
187 if (ycocg_scaled)
188 ctx->tex_funct = ctx->texdsp.dxt5ys_block;
189 else if (ycocg_classic)
190 ctx->tex_funct = ctx->texdsp.dxt5y_block;
191 else
192 ctx->tex_funct = ctx->texdsp.dxt5_block;
193 break;
194 case MKTAG('R', 'X', 'G', 'B'):
195 ctx->tex_ratio = 16;
196 ctx->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 ctx->postproc = DDS_SWIZZLE_RXGB;
200 normal_map = 0;
201 break;
202 case MKTAG('A', 'T', 'I', '1'):
203 case MKTAG('B', 'C', '4', 'U'):
204 ctx->tex_ratio = 8;
205 ctx->tex_funct = ctx->texdsp.rgtc1u_block;
206 break;
207 case MKTAG('B', 'C', '4', 'S'):
208 ctx->tex_ratio = 8;
209 ctx->tex_funct = ctx->texdsp.rgtc1s_block;
210 break;
211 case MKTAG('A', 'T', 'I', '2'):
212 /* RGT2 variant with swapped R and G (3Dc)*/
213 ctx->tex_ratio = 16;
214 ctx->tex_funct = ctx->texdsp.dxn3dc_block;
215 break;
216 case MKTAG('B', 'C', '5', 'U'):
217 ctx->tex_ratio = 16;
218 ctx->tex_funct = ctx->texdsp.rgtc2u_block;
219 break;
220 case MKTAG('B', 'C', '5', 'S'):
221 ctx->tex_ratio = 16;
222 ctx->tex_funct = ctx->texdsp.rgtc2s_block;
223 break;
224 case MKTAG('U', 'Y', 'V', 'Y'):
225 ctx->compressed = 0;
226 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
227 break;
228 case MKTAG('Y', 'U', 'Y', '2'):
229 ctx->compressed = 0;
230 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
231 break;
232 case MKTAG('P', '8', ' ', ' '):
233 /* ATI Palette8, same as normal palette */
234 ctx->compressed = 0;
235 ctx->paletted = 1;
236 avctx->pix_fmt = AV_PIX_FMT_PAL8;
237 break;
238 case MKTAG('D', 'X', '1', '0'):
239 /* DirectX 10 extra header */
240 dxgi = bytestream2_get_le32(gbc);
241 bytestream2_skip(gbc, 4); // resourceDimension
242 bytestream2_skip(gbc, 4); // miscFlag
243 array = bytestream2_get_le32(gbc);
244 bytestream2_skip(gbc, 4); // miscFlag2
245
246 if (array != 0)
247 av_log(avctx, AV_LOG_VERBOSE,
248 "Found array of size %d (ignored).\n", array);
249
250 /* Only BC[1-5] are actually compressed. */
251 ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
252
253 av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
254 switch (dxgi) {
255 /* RGB types. */
256 case DXGI_FORMAT_R16G16B16A16_TYPELESS:
257 case DXGI_FORMAT_R16G16B16A16_FLOAT:
258 case DXGI_FORMAT_R16G16B16A16_UNORM:
259 case DXGI_FORMAT_R16G16B16A16_UINT:
260 case DXGI_FORMAT_R16G16B16A16_SNORM:
261 case DXGI_FORMAT_R16G16B16A16_SINT:
262 avctx->pix_fmt = AV_PIX_FMT_BGRA64;
263 break;
264 case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
265 avctx->colorspace = AVCOL_SPC_RGB;
266 case DXGI_FORMAT_R8G8B8A8_TYPELESS:
267 case DXGI_FORMAT_R8G8B8A8_UNORM:
268 case DXGI_FORMAT_R8G8B8A8_UINT:
269 case DXGI_FORMAT_R8G8B8A8_SNORM:
270 case DXGI_FORMAT_R8G8B8A8_SINT:
271 avctx->pix_fmt = AV_PIX_FMT_BGRA;
272 break;
273 case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
274 avctx->colorspace = AVCOL_SPC_RGB;
275 case DXGI_FORMAT_B8G8R8A8_TYPELESS:
276 case DXGI_FORMAT_B8G8R8A8_UNORM:
277 avctx->pix_fmt = AV_PIX_FMT_RGBA;
278 break;
279 case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
280 avctx->colorspace = AVCOL_SPC_RGB;
281 case DXGI_FORMAT_B8G8R8X8_TYPELESS:
282 case DXGI_FORMAT_B8G8R8X8_UNORM:
283 avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
284 break;
285 case DXGI_FORMAT_B5G6R5_UNORM:
286 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
287 break;
288 /* Texture types. */
289 case DXGI_FORMAT_BC1_UNORM_SRGB:
290 avctx->colorspace = AVCOL_SPC_RGB;
291 case DXGI_FORMAT_BC1_TYPELESS:
292 case DXGI_FORMAT_BC1_UNORM:
293 ctx->tex_ratio = 8;
294 ctx->tex_funct = ctx->texdsp.dxt1a_block;
295 break;
296 case DXGI_FORMAT_BC2_UNORM_SRGB:
297 avctx->colorspace = AVCOL_SPC_RGB;
298 case DXGI_FORMAT_BC2_TYPELESS:
299 case DXGI_FORMAT_BC2_UNORM:
300 ctx->tex_ratio = 16;
301 ctx->tex_funct = ctx->texdsp.dxt3_block;
302 break;
303 case DXGI_FORMAT_BC3_UNORM_SRGB:
304 avctx->colorspace = AVCOL_SPC_RGB;
305 case DXGI_FORMAT_BC3_TYPELESS:
306 case DXGI_FORMAT_BC3_UNORM:
307 ctx->tex_ratio = 16;
308 ctx->tex_funct = ctx->texdsp.dxt5_block;
309 break;
310 case DXGI_FORMAT_BC4_TYPELESS:
311 case DXGI_FORMAT_BC4_UNORM:
312 ctx->tex_ratio = 8;
313 ctx->tex_funct = ctx->texdsp.rgtc1u_block;
314 break;
315 case DXGI_FORMAT_BC4_SNORM:
316 ctx->tex_ratio = 8;
317 ctx->tex_funct = ctx->texdsp.rgtc1s_block;
318 break;
319 case DXGI_FORMAT_BC5_TYPELESS:
320 case DXGI_FORMAT_BC5_UNORM:
321 ctx->tex_ratio = 16;
322 ctx->tex_funct = ctx->texdsp.rgtc2u_block;
323 break;
324 case DXGI_FORMAT_BC5_SNORM:
325 ctx->tex_ratio = 16;
326 ctx->tex_funct = ctx->texdsp.rgtc2s_block;
327 break;
328 default:
329 av_log(avctx, AV_LOG_ERROR,
330 "Unsupported DXGI format %d.\n", dxgi);
331 return AVERROR_INVALIDDATA;
332 }
333 break;
334 default:
335 av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", buf);
336 return AVERROR_INVALIDDATA;
337 }
338 } else if (ctx->paletted) {
339 if (bpp == 8) {
340 avctx->pix_fmt = AV_PIX_FMT_PAL8;
341 } else {
342 av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
343 return AVERROR_INVALIDDATA;
344 }
345 } else {
346 /* 8 bpp */
347 if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
348 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
349 /* 16 bpp */
350 else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
351 avctx->pix_fmt = AV_PIX_FMT_YA8;
352 else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
353 avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
354 else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
355 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
356 /* 24 bpp */
357 else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
358 avctx->pix_fmt = AV_PIX_FMT_BGR24;
359 /* 32 bpp */
360 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
361 avctx->pix_fmt = AV_PIX_FMT_BGRA; // opaque
362 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
363 avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
364 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
365 avctx->pix_fmt = AV_PIX_FMT_BGRA;
366 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
367 avctx->pix_fmt = AV_PIX_FMT_RGBA;
368 /* give up */
369 else {
370 av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
371 "[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
372 return AVERROR_INVALIDDATA;
373 }
374 }
375
376 /* Set any remaining post-proc that should happen before frame is ready. */
377 if (alpha_exponent)
378 ctx->postproc = DDS_ALPHA_EXP;
379 else if (normal_map)
380 ctx->postproc = DDS_NORMAL_MAP;
381 else if (ycocg_classic && !ctx->compressed)
382 ctx->postproc = DDS_RAW_YCOCG;
383 else if (avctx->pix_fmt == AV_PIX_FMT_YA8)
384 ctx->postproc = DDS_SWAP_ALPHA;
385
386 /* ATI/NVidia variants sometimes add swizzling in bpp. */
387 switch (bpp) {
388 case MKTAG('A', '2', 'X', 'Y'):
389 ctx->postproc = DDS_SWIZZLE_A2XY;
390 break;
391 case MKTAG('x', 'G', 'B', 'R'):
392 ctx->postproc = DDS_SWIZZLE_XGBR;
393 break;
394 case MKTAG('x', 'R', 'B', 'G'):
395 ctx->postproc = DDS_SWIZZLE_XRBG;
396 break;
397 case MKTAG('R', 'B', 'x', 'G'):
398 ctx->postproc = DDS_SWIZZLE_RBXG;
399 break;
400 case MKTAG('R', 'G', 'x', 'B'):
401 ctx->postproc = DDS_SWIZZLE_RGXB;
402 break;
403 case MKTAG('R', 'x', 'B', 'G'):
404 ctx->postproc = DDS_SWIZZLE_RXBG;
405 break;
406 case MKTAG('x', 'G', 'x', 'R'):
407 ctx->postproc = DDS_SWIZZLE_XGXR;
408 break;
409 case MKTAG('A', '2', 'D', '5'):
410 ctx->postproc = DDS_NORMAL_MAP;
411 break;
412 }
413
414 return 0;
415 }
416
417 static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
418 int slice, int thread_nb)
419 {
420 DDSContext *ctx = avctx->priv_data;
421 AVFrame *frame = arg;
422 const uint8_t *d = ctx->tex_data;
423 int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
424 int h_block = avctx->coded_height / TEXTURE_BLOCK_H;
425 int x, y;
426 int start_slice, end_slice;
427 int base_blocks_per_slice = h_block / ctx->slice_count;
428 int remainder_blocks = h_block % ctx->slice_count;
429
430 /* When the frame height (in blocks) doesn't divide evenly between the
431 * number of slices, spread the remaining blocks evenly between the first
432 * operations */
433 start_slice = slice * base_blocks_per_slice;
434 /* Add any extra blocks (one per slice) that have been added before this slice */
435 start_slice += FFMIN(slice, remainder_blocks);
436
437 end_slice = start_slice + base_blocks_per_slice;
438 /* Add an extra block if there are still remainder blocks to be accounted for */
439 if (slice < remainder_blocks)
440 end_slice++;
441
442 for (y = start_slice; y < end_slice; y++) {
443 uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
444 int off = y * w_block;
445 for (x = 0; x < w_block; x++) {
446 ctx->tex_funct(p + x * 16, frame->linesize[0],
447 d + (off + x) * ctx->tex_ratio);
448 }
449 }
450
451 return 0;
452 }
453
454 static void do_swizzle(AVFrame *frame, int x, int y)
455 {
456 int i;
457 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
458 uint8_t *src = frame->data[0] + i;
459 FFSWAP(uint8_t, src[x], src[y]);
460 }
461 }
462
463 static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
464 {
465 DDSContext *ctx = avctx->priv_data;
466 int i, x_off;
467
468 switch (ctx->postproc) {
469 case DDS_ALPHA_EXP:
470 /* Alpha-exponential mode divides each channel by the maximum
471 * R, G or B value, and stores the multiplying factor in the
472 * alpha channel. */
473 av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
474
475 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
476 uint8_t *src = frame->data[0] + i;
477 int r = src[0];
478 int g = src[1];
479 int b = src[2];
480 int a = src[3];
481
482 src[0] = r * a / 255;
483 src[1] = g * a / 255;
484 src[2] = b * a / 255;
485 src[3] = 255;
486 }
487 break;
488 case DDS_NORMAL_MAP:
489 /* Normal maps work in the XYZ color space and they encode
490 * X in R or in A, depending on the texture type, Y in G and
491 * derive Z with a square root of the distance.
492 *
493 * http://www.realtimecollisiondetection.net/blog/?p=28 */
494 av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
495
496 x_off = ctx->tex_ratio == 8 ? 0 : 3;
497 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
498 uint8_t *src = frame->data[0] + i;
499 int x = src[x_off];
500 int y = src[1];
501 int z = 127;
502
503 int d = (255 * 255 - x * x - y * y) / 2;
504 if (d > 0)
505 z = rint(sqrtf(d));
506
507 src[0] = x;
508 src[1] = y;
509 src[2] = z;
510 src[3] = 255;
511 }
512 break;
513 case DDS_RAW_YCOCG:
514 /* Data is Y-Co-Cg-A and not RGBA, but they are represented
515 * with the same masks in the DDPF header. */
516 av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
517
518 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
519 uint8_t *src = frame->data[0] + i;
520 int a = src[0];
521 int cg = src[1] - 128;
522 int co = src[2] - 128;
523 int y = src[3];
524
525 src[0] = av_clip_uint8(y + co - cg);
526 src[1] = av_clip_uint8(y + cg);
527 src[2] = av_clip_uint8(y - co - cg);
528 src[3] = a;
529 }
530 break;
531 case DDS_SWAP_ALPHA:
532 /* Alpha and Luma are stored swapped. */
533 av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
534
535 for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
536 uint8_t *src = frame->data[0] + i;
537 FFSWAP(uint8_t, src[0], src[1]);
538 }
539 break;
540 case DDS_SWIZZLE_A2XY:
541 /* Swap R and G, often used to restore a standard RGTC2. */
542 av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
543 do_swizzle(frame, 0, 1);
544 break;
545 case DDS_SWIZZLE_RBXG:
546 /* Swap G and A, then B and new A (G). */
547 av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
548 do_swizzle(frame, 1, 3);
549 do_swizzle(frame, 2, 3);
550 break;
551 case DDS_SWIZZLE_RGXB:
552 /* Swap B and A. */
553 av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
554 do_swizzle(frame, 2, 3);
555 break;
556 case DDS_SWIZZLE_RXBG:
557 /* Swap G and A. */
558 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
559 do_swizzle(frame, 1, 3);
560 break;
561 case DDS_SWIZZLE_RXGB:
562 /* Swap R and A (misleading name). */
563 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
564 do_swizzle(frame, 0, 3);
565 break;
566 case DDS_SWIZZLE_XGBR:
567 /* Swap B and A, then R and new A (B). */
568 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
569 do_swizzle(frame, 2, 3);
570 do_swizzle(frame, 0, 3);
571 break;
572 case DDS_SWIZZLE_XGXR:
573 /* Swap G and A, then R and new A (G), then new R (G) and new G (A).
574 * This variant does not store any B component. */
575 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
576 do_swizzle(frame, 1, 3);
577 do_swizzle(frame, 0, 3);
578 do_swizzle(frame, 0, 1);
579 break;
580 case DDS_SWIZZLE_XRBG:
581 /* Swap G and A, then R and new A (G). */
582 av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
583 do_swizzle(frame, 1, 3);
584 do_swizzle(frame, 0, 3);
585 break;
586 }
587 }
588
589 static int dds_decode(AVCodecContext *avctx, void *data,
590 int *got_frame, AVPacket *avpkt)
591 {
592 DDSContext *ctx = avctx->priv_data;
593 GetByteContext *gbc = &ctx->gbc;
594 AVFrame *frame = data;
595 int mipmap;
596 int ret;
597
598 ff_texturedsp_init(&ctx->texdsp);
599 bytestream2_init(gbc, avpkt->data, avpkt->size);
600
601 if (bytestream2_get_bytes_left(gbc) < 128) {
602 av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).",
603 bytestream2_get_bytes_left(gbc));
604 return AVERROR_INVALIDDATA;
605 }
606
607 if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
608 bytestream2_get_le32(gbc) != 124) { // header size
609 av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.");
610 return AVERROR_INVALIDDATA;
611 }
612
613 bytestream2_skip(gbc, 4); // flags
614
615 avctx->height = bytestream2_get_le32(gbc);
616 avctx->width = bytestream2_get_le32(gbc);
617 ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
618 if (ret < 0) {
619 av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
620 avctx->width, avctx->height);
621 return ret;
622 }
623
624 /* Since codec is based on 4x4 blocks, size is aligned to 4. */
625 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
626 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
627
628 bytestream2_skip(gbc, 4); // pitch
629 bytestream2_skip(gbc, 4); // depth
630 mipmap = bytestream2_get_le32(gbc);
631 if (mipmap != 0)
632 av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
633
634 /* Extract pixel format information, considering additional elements
635 * in reserved1 and reserved2. */
636 ret = parse_pixel_format(avctx);
637 if (ret < 0)
638 return ret;
639
640 ret = ff_get_buffer(avctx, frame, 0);
641 if (ret < 0)
642 return ret;
643
644 if (ctx->compressed) {
645 ctx->slice_count = av_clip(avctx->thread_count, 1,
646 avctx->coded_height / TEXTURE_BLOCK_H);
647
648 /* Use the decompress function on the texture, one block per thread. */
649 ctx->tex_data = gbc->buffer;
650 avctx->execute2(avctx, decompress_texture_thread, frame, NULL, ctx->slice_count);
651 } else {
652 int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
653
654 if (ctx->paletted) {
655 int i;
656 uint32_t *p = (uint32_t*) frame->data[1];
657
658 /* Use the first 1024 bytes as palette, then copy the rest. */
659 for (i = 0; i < 256; i++) {
660 uint32_t rgba = 0;
661 rgba |= bytestream2_get_byte(gbc) << 16;
662 rgba |= bytestream2_get_byte(gbc) << 8;
663 rgba |= bytestream2_get_byte(gbc) << 0;
664 rgba |= bytestream2_get_byte(gbc) << 24;
665 p[i] = rgba;
666 }
667
668 frame->palette_has_changed = 1;
669 }
670
671 if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
672 av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
673 bytestream2_get_bytes_left(gbc), frame->height * linesize);
674 return AVERROR_INVALIDDATA;
675 }
676
677 av_image_copy_plane(frame->data[0], frame->linesize[0],
678 gbc->buffer, linesize,
679 linesize, frame->height);
680 }
681
682 /* Run any post processing here if needed. */
683 if (avctx->pix_fmt == AV_PIX_FMT_BGRA ||
684 avctx->pix_fmt == AV_PIX_FMT_RGBA ||
685 avctx->pix_fmt == AV_PIX_FMT_YA8)
686 run_postproc(avctx, frame);
687
688 /* Frame is ready to be output. */
689 frame->pict_type = AV_PICTURE_TYPE_I;
690 frame->key_frame = 1;
691 *got_frame = 1;
692
693 return avpkt->size;
694 }
695
696 AVCodec ff_dds_decoder = {
697 .name = "dds",
698 .long_name = NULL_IF_CONFIG_SMALL("DirectDraw Surface image decoder"),
699 .type = AVMEDIA_TYPE_VIDEO,
700 .id = AV_CODEC_ID_DDS,
701 .decode = dds_decode,
702 .priv_data_size = sizeof(DDSContext),
703 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
704 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE
705 };
Libav master