DirectDraw Surface image decoder
[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 } DDSPostProc;
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 } DDSDXGIFormat;
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
109 /* Pointer to the selected compress or decompress function. */
110 int (*tex_funct)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
111 } DDSContext;
112
113 static int parse_pixel_format(AVCodecContext *avctx)
114 {
115 DDSContext *ctx = avctx->priv_data;
116 GetByteContext *gbc = &ctx->gbc;
117 char buf[32];
118 uint32_t flags, fourcc, gimp_tag;
119 enum DDSDXGIFormat dxgi;
120 int size, bpp, r, g, b, a;
121 int alpha_exponent, ycocg_classic, ycocg_scaled, normal_map, array;
122
123 /* Alternative DDS implementations use reserved1 as custom header. */
124 bytestream2_skip(gbc, 4 * 3);
125 gimp_tag = bytestream2_get_le32(gbc);
126 alpha_exponent = gimp_tag == MKTAG('A', 'E', 'X', 'P');
127 ycocg_classic = gimp_tag == MKTAG('Y', 'C', 'G', '1');
128 ycocg_scaled = gimp_tag == MKTAG('Y', 'C', 'G', '2');
129 bytestream2_skip(gbc, 4 * 7);
130
131 /* Now the real DDPF starts. */
132 size = bytestream2_get_le32(gbc);
133 if (size != 32) {
134 av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
135 return AVERROR_INVALIDDATA;
136 }
137 flags = bytestream2_get_le32(gbc);
138 ctx->compressed = flags & DDPF_FOURCC;
139 ctx->paletted = flags & DDPF_PALETTE;
140 normal_map = flags & DDPF_NORMALMAP;
141 fourcc = bytestream2_get_le32(gbc);
142
143 bpp = bytestream2_get_le32(gbc); // rgbbitcount
144 r = bytestream2_get_le32(gbc); // rbitmask
145 g = bytestream2_get_le32(gbc); // gbitmask
146 b = bytestream2_get_le32(gbc); // bbitmask
147 a = bytestream2_get_le32(gbc); // abitmask
148
149 bytestream2_skip(gbc, 4); // caps
150 bytestream2_skip(gbc, 4); // caps2
151 bytestream2_skip(gbc, 4); // caps3
152 bytestream2_skip(gbc, 4); // caps4
153 bytestream2_skip(gbc, 4); // reserved2
154
155 av_get_codec_tag_string(buf, sizeof(buf), fourcc);
156 av_log(avctx, AV_LOG_VERBOSE, "fourcc %s bpp %d "
157 "r 0x%x g 0x%x b 0x%x a 0x%x\n", buf, bpp, r, g, b, a);
158 if (gimp_tag) {
159 av_get_codec_tag_string(buf, sizeof(buf), gimp_tag);
160 av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", buf);
161 }
162
163 if (ctx->compressed)
164 avctx->pix_fmt = AV_PIX_FMT_RGBA;
165
166 if (ctx->compressed) {
167 switch (fourcc) {
168 case MKTAG('D', 'X', 'T', '1'):
169 ctx->tex_ratio = 8;
170 ctx->tex_funct = ctx->texdsp.dxt1a_block;
171 break;
172 case MKTAG('D', 'X', 'T', '2'):
173 ctx->tex_ratio = 16;
174 ctx->tex_funct = ctx->texdsp.dxt2_block;
175 break;
176 case MKTAG('D', 'X', 'T', '3'):
177 ctx->tex_ratio = 16;
178 ctx->tex_funct = ctx->texdsp.dxt3_block;
179 break;
180 case MKTAG('D', 'X', 'T', '4'):
181 ctx->tex_ratio = 16;
182 ctx->tex_funct = ctx->texdsp.dxt4_block;
183 break;
184 case MKTAG('D', 'X', 'T', '5'):
185 ctx->tex_ratio = 16;
186 if (ycocg_scaled)
187 ctx->tex_funct = ctx->texdsp.dxt5ys_block;
188 else if (ycocg_classic)
189 ctx->tex_funct = ctx->texdsp.dxt5y_block;
190 else
191 ctx->tex_funct = ctx->texdsp.dxt5_block;
192 break;
193 case MKTAG('R', 'X', 'G', 'B'):
194 ctx->tex_ratio = 16;
195 ctx->tex_funct = ctx->texdsp.dxt5_block;
196 /* This format may be considered as a normal map,
197 * but it is handled differently in a separate postproc. */
198 ctx->postproc = DDS_SWIZZLE_RXGB;
199 normal_map = 0;
200 break;
201 case MKTAG('A', 'T', 'I', '1'):
202 case MKTAG('B', 'C', '4', 'U'):
203 ctx->tex_ratio = 8;
204 ctx->tex_funct = ctx->texdsp.rgtc1u_block;
205 break;
206 case MKTAG('B', 'C', '4', 'S'):
207 ctx->tex_ratio = 8;
208 ctx->tex_funct = ctx->texdsp.rgtc1s_block;
209 break;
210 case MKTAG('A', 'T', 'I', '2'):
211 /* RGT2 variant with swapped R and G (3Dc)*/
212 ctx->tex_ratio = 16;
213 ctx->tex_funct = ctx->texdsp.dxn3dc_block;
214 break;
215 case MKTAG('B', 'C', '5', 'U'):
216 ctx->tex_ratio = 16;
217 ctx->tex_funct = ctx->texdsp.rgtc2u_block;
218 break;
219 case MKTAG('B', 'C', '5', 'S'):
220 ctx->tex_ratio = 16;
221 ctx->tex_funct = ctx->texdsp.rgtc2s_block;
222 break;
223 case MKTAG('U', 'Y', 'V', 'Y'):
224 ctx->compressed = 0;
225 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
226 break;
227 case MKTAG('Y', 'U', 'Y', '2'):
228 ctx->compressed = 0;
229 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
230 break;
231 case MKTAG('P', '8', ' ', ' '):
232 /* ATI Palette8, same as normal palette */
233 ctx->compressed = 0;
234 ctx->paletted = 1;
235 avctx->pix_fmt = AV_PIX_FMT_PAL8;
236 break;
237 case MKTAG('D', 'X', '1', '0'):
238 /* DirectX 10 extra header */
239 dxgi = bytestream2_get_le32(gbc);
240 bytestream2_skip(gbc, 4); // resourceDimension
241 bytestream2_skip(gbc, 4); // miscFlag
242 array = bytestream2_get_le32(gbc);
243 bytestream2_skip(gbc, 4); // miscFlag2
244
245 if (array != 0)
246 av_log(avctx, AV_LOG_VERBOSE,
247 "Found array of size %d (ignored).\n", array);
248
249 /* Only BC[1-5] are actually compressed. */
250 ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
251
252 av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
253 switch (dxgi) {
254 /* RGB types. */
255 case DXGI_FORMAT_R16G16B16A16_TYPELESS:
256 case DXGI_FORMAT_R16G16B16A16_FLOAT:
257 case DXGI_FORMAT_R16G16B16A16_UNORM:
258 case DXGI_FORMAT_R16G16B16A16_UINT:
259 case DXGI_FORMAT_R16G16B16A16_SNORM:
260 case DXGI_FORMAT_R16G16B16A16_SINT:
261 avctx->pix_fmt = AV_PIX_FMT_BGRA64;
262 break;
263 case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
264 avctx->colorspace = AVCOL_SPC_RGB;
265 case DXGI_FORMAT_R8G8B8A8_TYPELESS:
266 case DXGI_FORMAT_R8G8B8A8_UNORM:
267 case DXGI_FORMAT_R8G8B8A8_UINT:
268 case DXGI_FORMAT_R8G8B8A8_SNORM:
269 case DXGI_FORMAT_R8G8B8A8_SINT:
270 avctx->pix_fmt = AV_PIX_FMT_BGRA;
271 break;
272 case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
273 avctx->colorspace = AVCOL_SPC_RGB;
274 case DXGI_FORMAT_B8G8R8A8_TYPELESS:
275 case DXGI_FORMAT_B8G8R8A8_UNORM:
276 avctx->pix_fmt = AV_PIX_FMT_RGBA;
277 break;
278 case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
279 avctx->colorspace = AVCOL_SPC_RGB;
280 case DXGI_FORMAT_B8G8R8X8_TYPELESS:
281 case DXGI_FORMAT_B8G8R8X8_UNORM:
282 avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
283 break;
284 case DXGI_FORMAT_B5G6R5_UNORM:
285 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
286 break;
287 /* Texture types. */
288 case DXGI_FORMAT_BC1_UNORM_SRGB:
289 avctx->colorspace = AVCOL_SPC_RGB;
290 case DXGI_FORMAT_BC1_TYPELESS:
291 case DXGI_FORMAT_BC1_UNORM:
292 ctx->tex_ratio = 8;
293 ctx->tex_funct = ctx->texdsp.dxt1a_block;
294 break;
295 case DXGI_FORMAT_BC2_UNORM_SRGB:
296 avctx->colorspace = AVCOL_SPC_RGB;
297 case DXGI_FORMAT_BC2_TYPELESS:
298 case DXGI_FORMAT_BC2_UNORM:
299 ctx->tex_ratio = 16;
300 ctx->tex_funct = ctx->texdsp.dxt3_block;
301 break;
302 case DXGI_FORMAT_BC3_UNORM_SRGB:
303 avctx->colorspace = AVCOL_SPC_RGB;
304 case DXGI_FORMAT_BC3_TYPELESS:
305 case DXGI_FORMAT_BC3_UNORM:
306 ctx->tex_ratio = 16;
307 ctx->tex_funct = ctx->texdsp.dxt5_block;
308 break;
309 case DXGI_FORMAT_BC4_TYPELESS:
310 case DXGI_FORMAT_BC4_UNORM:
311 ctx->tex_ratio = 8;
312 ctx->tex_funct = ctx->texdsp.rgtc1u_block;
313 break;
314 case DXGI_FORMAT_BC4_SNORM:
315 ctx->tex_ratio = 8;
316 ctx->tex_funct = ctx->texdsp.rgtc1s_block;
317 break;
318 case DXGI_FORMAT_BC5_TYPELESS:
319 case DXGI_FORMAT_BC5_UNORM:
320 ctx->tex_ratio = 16;
321 ctx->tex_funct = ctx->texdsp.rgtc2u_block;
322 break;
323 case DXGI_FORMAT_BC5_SNORM:
324 ctx->tex_ratio = 16;
325 ctx->tex_funct = ctx->texdsp.rgtc2s_block;
326 break;
327 default:
328 av_log(avctx, AV_LOG_ERROR,
329 "Unsupported DXGI format %d.\n", dxgi);
330 return AVERROR_INVALIDDATA;
331 }
332 break;
333 default:
334 av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", buf);
335 return AVERROR_INVALIDDATA;
336 }
337 } else if (ctx->paletted) {
338 if (bpp == 8) {
339 avctx->pix_fmt = AV_PIX_FMT_PAL8;
340 } else {
341 av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
342 return AVERROR_INVALIDDATA;
343 }
344 } else {
345 /* 8 bpp */
346 if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
347 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
348 /* 16 bpp */
349 else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
350 avctx->pix_fmt = AV_PIX_FMT_YA8;
351 else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
352 avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
353 else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
354 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
355 /* 24 bpp */
356 else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
357 avctx->pix_fmt = AV_PIX_FMT_BGR24;
358 /* 32 bpp */
359 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
360 avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
361 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
362 avctx->pix_fmt = AV_PIX_FMT_BGRA; // opaque
363 else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
364 avctx->pix_fmt = AV_PIX_FMT_RGBA;
365 else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
366 avctx->pix_fmt = AV_PIX_FMT_BGRA;
367 /* give up */
368 else {
369 av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
370 "[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
371 return AVERROR_INVALIDDATA;
372 }
373 }
374
375 /* Set any remaining post-proc that should happen before frame is ready. */
376 if (alpha_exponent)
377 ctx->postproc = DDS_ALPHA_EXP;
378 else if (normal_map)
379 ctx->postproc = DDS_NORMAL_MAP;
380 else if (ycocg_classic && !ctx->compressed)
381 ctx->postproc = DDS_RAW_YCOCG;
382 else if (avctx->pix_fmt == AV_PIX_FMT_YA8)
383 ctx->postproc = DDS_SWAP_ALPHA;
384
385 /* ATI/NVidia variants sometimes add swizzling in bpp. */
386 switch (bpp) {
387 case MKTAG('A', '2', 'X', 'Y'):
388 ctx->postproc = DDS_SWIZZLE_A2XY;
389 break;
390 case MKTAG('x', 'G', 'B', 'R'):
391 ctx->postproc = DDS_SWIZZLE_XGBR;
392 break;
393 case MKTAG('x', 'R', 'B', 'G'):
394 ctx->postproc = DDS_SWIZZLE_XRBG;
395 break;
396 case MKTAG('R', 'B', 'x', 'G'):
397 ctx->postproc = DDS_SWIZZLE_RBXG;
398 break;
399 case MKTAG('R', 'G', 'x', 'B'):
400 ctx->postproc = DDS_SWIZZLE_RGXB;
401 break;
402 case MKTAG('R', 'x', 'B', 'G'):
403 ctx->postproc = DDS_SWIZZLE_RXBG;
404 break;
405 case MKTAG('x', 'G', 'x', 'R'):
406 ctx->postproc = DDS_SWIZZLE_XGXR;
407 break;
408 case MKTAG('A', '2', 'D', '5'):
409 ctx->postproc = DDS_NORMAL_MAP;
410 break;
411 }
412
413 return 0;
414 }
415
416 static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
417 int block_nb, int thread_nb)
418 {
419 DDSContext *ctx = avctx->priv_data;
420 AVFrame *frame = arg;
421 int x = (TEXTURE_BLOCK_W * block_nb) % avctx->coded_width;
422 int y = TEXTURE_BLOCK_H * (TEXTURE_BLOCK_W * block_nb / avctx->coded_width);
423 uint8_t *p = frame->data[0] + x * 4 + y * frame->linesize[0];
424 const uint8_t *d = ctx->tex_data + block_nb * ctx->tex_ratio;
425
426 ctx->tex_funct(p, frame->linesize[0], d);
427 return 0;
428 }
429
430 static void do_swizzle(AVFrame *frame, int x, int y)
431 {
432 int i;
433 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
434 uint8_t *src = frame->data[0] + i;
435 FFSWAP(uint8_t, src[x], src[y]);
436 }
437 }
438
439 static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
440 {
441 DDSContext *ctx = avctx->priv_data;
442 int i, x_off;
443
444 switch (ctx->postproc) {
445 case DDS_ALPHA_EXP:
446 /* Alpha-exponential mode divides each channel by the maximum
447 * R, G or B value, and stores the multiplying factor in the
448 * alpha channel. */
449 av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
450
451 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
452 uint8_t *src = frame->data[0] + i;
453 int r = src[0];
454 int g = src[1];
455 int b = src[2];
456 int a = src[3];
457
458 src[0] = r * a / 255;
459 src[1] = g * a / 255;
460 src[2] = b * a / 255;
461 src[3] = 255;
462 }
463 break;
464 case DDS_NORMAL_MAP:
465 /* Normal maps work in the XYZ color space and they encode
466 * X in R or in A, depending on the texture type, Y in G and
467 * derive Z with a square root of the distance.
468 *
469 * http://www.realtimecollisiondetection.net/blog/?p=28 */
470 av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
471
472 x_off = ctx->tex_ratio == 8 ? 0 : 3;
473 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
474 uint8_t *src = frame->data[0] + i;
475 int x = src[x_off];
476 int y = src[1];
477 int z = 127;
478
479 int d = (255 * 255 - x * x - y * y) / 2;
480 if (d > 0)
481 z = rint(sqrtf(d));
482
483 src[0] = x;
484 src[1] = y;
485 src[2] = z;
486 src[3] = 255;
487 }
488 break;
489 case DDS_RAW_YCOCG:
490 /* Data is Y-Co-Cg-A and not RGBA, but they are represented
491 * with the same masks in the DDPF header. */
492 av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
493
494 for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
495 uint8_t *src = frame->data[0] + i;
496 int a = src[0];
497 int cg = src[1] - 128;
498 int co = src[2] - 128;
499 int y = src[3];
500
501 src[0] = av_clip_uint8(y + co - cg);
502 src[1] = av_clip_uint8(y + cg);
503 src[2] = av_clip_uint8(y - co - cg);
504 src[3] = a;
505 }
506 break;
507 case DDS_SWAP_ALPHA:
508 /* Alpha and Luma are stored swapped. */
509 av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
510
511 for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
512 uint8_t *src = frame->data[0] + i;
513 FFSWAP(uint8_t, src[0], src[1]);
514 }
515 break;
516 case DDS_SWIZZLE_A2XY:
517 /* Swap R and G, often used to restore a standard RGTC2. */
518 av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
519 do_swizzle(frame, 0, 1);
520 break;
521 case DDS_SWIZZLE_RBXG:
522 /* Swap G and A, then B and new A (G). */
523 av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
524 do_swizzle(frame, 1, 3);
525 do_swizzle(frame, 2, 3);
526 break;
527 case DDS_SWIZZLE_RGXB:
528 /* Swap B and A. */
529 av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
530 do_swizzle(frame, 2, 3);
531 break;
532 case DDS_SWIZZLE_RXBG:
533 /* Swap G and A. */
534 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
535 do_swizzle(frame, 1, 3);
536 break;
537 case DDS_SWIZZLE_RXGB:
538 /* Swap R and A (misleading name). */
539 av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
540 do_swizzle(frame, 0, 3);
541 break;
542 case DDS_SWIZZLE_XGBR:
543 /* Swap B and A, then R and new A (B). */
544 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
545 do_swizzle(frame, 2, 3);
546 do_swizzle(frame, 0, 3);
547 break;
548 case DDS_SWIZZLE_XGXR:
549 /* Swap G and A, then R and new A (G), then new R (G) and new G (A).
550 * This variant does not store any B component. */
551 av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
552 do_swizzle(frame, 1, 3);
553 do_swizzle(frame, 0, 3);
554 do_swizzle(frame, 0, 1);
555 break;
556 case DDS_SWIZZLE_XRBG:
557 /* Swap G and A, then R and new A (G). */
558 av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
559 do_swizzle(frame, 1, 3);
560 do_swizzle(frame, 0, 3);
561 break;
562 }
563 }
564
565 static int dds_decode(AVCodecContext *avctx, void *data,
566 int *got_frame, AVPacket *avpkt)
567 {
568 DDSContext *ctx = avctx->priv_data;
569 GetByteContext *gbc = &ctx->gbc;
570 AVFrame *frame = data;
571 int blocks, mipmap;
572 int ret;
573
574 ff_texturedsp_init(&ctx->texdsp);
575 bytestream2_init(gbc, avpkt->data, avpkt->size);
576
577 if (bytestream2_get_bytes_left(gbc) < 128) {
578 av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).",
579 bytestream2_get_bytes_left(gbc));
580 return AVERROR_INVALIDDATA;
581 }
582
583 if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
584 bytestream2_get_le32(gbc) != 124) { // header size
585 av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.");
586 return AVERROR_INVALIDDATA;
587 }
588
589 bytestream2_skip(gbc, 4); // flags
590
591 avctx->height = bytestream2_get_le32(gbc);
592 avctx->width = bytestream2_get_le32(gbc);
593 ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
594 if (ret < 0) {
595 av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
596 avctx->width, avctx->height);
597 return ret;
598 }
599
600 /* Since codec is based on 4x4 blocks, size is aligned to 4. */
601 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
602 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
603
604 bytestream2_skip(gbc, 4); // pitch
605 bytestream2_skip(gbc, 4); // depth
606 mipmap = bytestream2_get_le32(gbc);
607 if (mipmap != 0)
608 av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
609
610 /* Extract pixel format information, considering additional elements
611 * in reserved1 and reserved2. */
612 ret = parse_pixel_format(avctx);
613 if (ret < 0)
614 return ret;
615
616 ret = ff_get_buffer(avctx, frame, 0);
617 if (ret < 0)
618 return ret;
619
620 if (ctx->compressed) {
621 /* Use the decompress function on the texture, one block per thread. */
622 ctx->tex_data = gbc->buffer;
623 blocks = avctx->coded_width * avctx->coded_height / (TEXTURE_BLOCK_W * TEXTURE_BLOCK_H);
624 avctx->execute2(avctx, decompress_texture_thread, frame, NULL, blocks);
625 } else {
626 int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
627
628 if (ctx->paletted) {
629 /* Use the first 1024 bytes as palette, then copy the rest. */
630 bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
631 frame->palette_has_changed = 1;
632 }
633
634 av_image_copy_plane(frame->data[0], frame->linesize[0],
635 gbc->buffer, linesize,
636 linesize, frame->height);
637 }
638
639 /* Run any post processing here if needed. */
640 if (avctx->pix_fmt == AV_PIX_FMT_RGBA || avctx->pix_fmt == AV_PIX_FMT_YA8)
641 run_postproc(avctx, frame);
642
643 /* Frame is ready to be output. */
644 frame->pict_type = AV_PICTURE_TYPE_I;
645 frame->key_frame = 1;
646 *got_frame = 1;
647
648 return avpkt->size;
649 }
650
651 AVCodec ff_dds_decoder = {
652 .name = "dds",
653 .long_name = NULL_IF_CONFIG_SMALL("DirectDraw Surface image decoder"),
654 .type = AVMEDIA_TYPE_VIDEO,
655 .id = AV_CODEC_ID_DDS,
656 .decode = dds_decode,
657 .priv_data_size = sizeof(DDSContext),
658 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
659 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE
660 };