LCOV - code coverage report
Current view: top level - libavcodec - dds.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 343 437 78.5 %
Date: 2017-12-12 11:08:38 Functions: 5 5 100.0 %

          Line data    Source code
       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          96 :     if (size != 32) {
     136           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
     137           0 :         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          96 :     if (ctx->compressed && ctx->paletted) {
     146           0 :         av_log(avctx, AV_LOG_WARNING,
     147             :                "Disabling invalid palette flag for compressed dds.\n");
     148           0 :         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          96 :     if (gimp_tag)
     166          10 :         av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", av_fourcc2str(gimp_tag));
     167             : 
     168          96 :     if (ctx->compressed)
     169          68 :         avctx->pix_fmt = AV_PIX_FMT_RGBA;
     170             : 
     171          96 :     if (ctx->compressed) {
     172          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           6 :             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          24 :             if (ycocg_scaled)
     192           2 :                 ctx->tex_funct = ctx->texdsp.dxt5ys_block;
     193          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           0 :         case MKTAG('B', 'C', '5', 'U'):
     221           0 :             ctx->tex_ratio = 16;
     222           0 :             ctx->tex_funct = ctx->texdsp.rgtc2u_block;
     223           0 :             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          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          12 :             ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
     260             : 
     261          12 :             av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
     262          12 :             switch (dxgi) {
     263             :             /* RGB types. */
     264           0 :             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           0 :                 avctx->pix_fmt = AV_PIX_FMT_BGRA64;
     271           0 :                 break;
     272           0 :             case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
     273           0 :                 avctx->colorspace = AVCOL_SPC_RGB;
     274           0 :             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           0 :                 avctx->pix_fmt = AV_PIX_FMT_BGRA;
     280           0 :                 break;
     281           0 :             case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
     282           0 :                 avctx->colorspace = AVCOL_SPC_RGB;
     283           0 :             case DXGI_FORMAT_B8G8R8A8_TYPELESS:
     284             :             case DXGI_FORMAT_B8G8R8A8_UNORM:
     285           0 :                 avctx->pix_fmt = AV_PIX_FMT_RGBA;
     286           0 :                 break;
     287           0 :             case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
     288           0 :                 avctx->colorspace = AVCOL_SPC_RGB;
     289           0 :             case DXGI_FORMAT_B8G8R8X8_TYPELESS:
     290             :             case DXGI_FORMAT_B8G8R8X8_UNORM:
     291           0 :                 avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
     292           0 :                 break;
     293           0 :             case DXGI_FORMAT_B5G6R5_UNORM:
     294           0 :                 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
     295           0 :                 break;
     296             :             /* Texture types. */
     297           0 :             case DXGI_FORMAT_BC1_UNORM_SRGB:
     298           0 :                 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           0 :             case DXGI_FORMAT_BC2_UNORM_SRGB:
     305           0 :                 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           0 :             case DXGI_FORMAT_BC3_UNORM_SRGB:
     312           0 :                 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           0 :             case DXGI_FORMAT_BC4_SNORM:
     324           0 :                 ctx->tex_ratio = 8;
     325           0 :                 ctx->tex_funct = ctx->texdsp.rgtc1s_block;
     326           0 :                 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           0 :             case DXGI_FORMAT_BC5_SNORM:
     333           0 :                 ctx->tex_ratio = 16;
     334           0 :                 ctx->tex_funct = ctx->texdsp.rgtc2s_block;
     335           0 :                 break;
     336           0 :             default:
     337           0 :                 av_log(avctx, AV_LOG_ERROR,
     338             :                        "Unsupported DXGI format %d.\n", dxgi);
     339           0 :                 return AVERROR_INVALIDDATA;
     340             :             }
     341          12 :             break;
     342           0 :         default:
     343           0 :             av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", av_fourcc2str(fourcc));
     344           0 :             return AVERROR_INVALIDDATA;
     345             :         }
     346          28 :     } else if (ctx->paletted) {
     347           2 :         if (bpp == 8) {
     348           2 :             avctx->pix_fmt = AV_PIX_FMT_PAL8;
     349             :         } else {
     350           0 :             av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
     351           0 :             return AVERROR_INVALIDDATA;
     352             :         }
     353             :     } else {
     354             :         /*  4 bpp */
     355          26 :         if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
     356           0 :             avctx->pix_fmt = AV_PIX_FMT_PAL8;
     357             :         /*  8 bpp */
     358          26 :         else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
     359           2 :             avctx->pix_fmt = AV_PIX_FMT_GRAY8;
     360          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          22 :         else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
     364           2 :             avctx->pix_fmt = AV_PIX_FMT_YA8;
     365          20 :         else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
     366           0 :             avctx->pix_fmt = AV_PIX_FMT_YA8;
     367           0 :             ctx->postproc = DDS_SWAP_ALPHA;
     368             :         }
     369          20 :         else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
     370           0 :             avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
     371          20 :         else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
     372           2 :             avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
     373          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          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          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          12 :         else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
     382           2 :             avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
     383          10 :         else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
     384           2 :             avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
     385           8 :         else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
     386           8 :             avctx->pix_fmt = AV_PIX_FMT_BGRA;
     387           0 :         else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
     388           0 :             avctx->pix_fmt = AV_PIX_FMT_RGBA;
     389             :         /* give up */
     390             :         else {
     391           0 :             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           0 :             return AVERROR_INVALIDDATA;
     394             :         }
     395             :     }
     396             : 
     397             :     /* Set any remaining post-proc that should happen before frame is ready. */
     398          96 :     if (alpha_exponent)
     399           4 :         ctx->postproc = DDS_ALPHA_EXP;
     400          92 :     else if (normal_map)
     401           4 :         ctx->postproc = DDS_NORMAL_MAP;
     402          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          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          60 :     if (slice < remainder_blocks)
     459           0 :         end_slice++;
     460             : 
     461        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       16832 :         for (x = 0; x < w_block; x++) {
     465       31744 :             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      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          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       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           6 :         x_off = ctx->tex_ratio == 8 ? 0 : 3;
     516       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       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        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           0 :     case DDS_SWAP_ALPHA:
     551             :         /* Alpha and Luma are stored swapped. */
     552           0 :         av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
     553             : 
     554           0 :         for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
     555           0 :             uint8_t *src = frame->data[0] + i;
     556           0 :             FFSWAP(uint8_t, src[0], src[1]);
     557             :         }
     558           0 :         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             : 
     617          96 :     ff_texturedsp_init(&ctx->texdsp);
     618          96 :     bytestream2_init(gbc, avpkt->data, avpkt->size);
     619             : 
     620          96 :     if (bytestream2_get_bytes_left(gbc) < 128) {
     621           0 :         av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n",
     622             :                bytestream2_get_bytes_left(gbc));
     623           0 :         return AVERROR_INVALIDDATA;
     624             :     }
     625             : 
     626         192 :     if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
     627          96 :         bytestream2_get_le32(gbc) != 124) { // header size
     628           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.\n");
     629           0 :         return AVERROR_INVALIDDATA;
     630             :     }
     631             : 
     632          96 :     bytestream2_skip(gbc, 4); // flags
     633             : 
     634          96 :     avctx->height = bytestream2_get_le32(gbc);
     635          96 :     avctx->width  = bytestream2_get_le32(gbc);
     636          96 :     ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
     637          96 :     if (ret < 0) {
     638           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
     639             :                avctx->width, avctx->height);
     640           0 :         return ret;
     641             :     }
     642             : 
     643             :     /* Since codec is based on 4x4 blocks, size is aligned to 4. */
     644          96 :     avctx->coded_width  = FFALIGN(avctx->width,  TEXTURE_BLOCK_W);
     645          96 :     avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
     646             : 
     647          96 :     bytestream2_skip(gbc, 4); // pitch
     648          96 :     bytestream2_skip(gbc, 4); // depth
     649          96 :     mipmap = bytestream2_get_le32(gbc);
     650          96 :     if (mipmap != 0)
     651          56 :         av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
     652             : 
     653             :     /* Extract pixel format information, considering additional elements
     654             :      * in reserved1 and reserved2. */
     655          96 :     ret = parse_pixel_format(avctx);
     656          96 :     if (ret < 0)
     657           0 :         return ret;
     658             : 
     659          96 :     ret = ff_get_buffer(avctx, frame, 0);
     660          96 :     if (ret < 0)
     661           0 :         return ret;
     662             : 
     663          96 :     if (ctx->compressed) {
     664         180 :         int size = (avctx->coded_height / TEXTURE_BLOCK_H) *
     665         120 :                    (avctx->coded_width / TEXTURE_BLOCK_W) * ctx->tex_ratio;
     666          60 :         ctx->slice_count = av_clip(avctx->thread_count, 1,
     667          60 :                                    avctx->coded_height / TEXTURE_BLOCK_H);
     668             : 
     669          60 :         if (bytestream2_get_bytes_left(gbc) < size) {
     670           0 :             av_log(avctx, AV_LOG_ERROR,
     671             :                    "Compressed Buffer is too small (%d < %d).\n",
     672             :                    bytestream2_get_bytes_left(gbc), size);
     673           0 :             return AVERROR_INVALIDDATA;
     674             :         }
     675             : 
     676             :         /* Use the decompress function on the texture, one block per thread. */
     677          60 :         ctx->tex_data = gbc->buffer;
     678          60 :         avctx->execute2(avctx, decompress_texture_thread, frame, NULL, ctx->slice_count);
     679          36 :     } else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
     680           0 :         uint8_t *dst = frame->data[0];
     681             :         int x, y, i;
     682             : 
     683             :         /* Use the first 64 bytes as palette, then copy the rest. */
     684           0 :         bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
     685           0 :         for (i = 0; i < 16; i++) {
     686           0 :             AV_WN32(frame->data[1] + i*4,
     687             :                     (frame->data[1][2+i*4]<<0)+
     688             :                     (frame->data[1][1+i*4]<<8)+
     689             :                     (frame->data[1][0+i*4]<<16)+
     690             :                     ((unsigned)frame->data[1][3+i*4]<<24)
     691             :             );
     692             :         }
     693           0 :         frame->palette_has_changed = 1;
     694             : 
     695           0 :         if (bytestream2_get_bytes_left(gbc) < frame->height * frame->width / 2) {
     696           0 :             av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
     697           0 :                    bytestream2_get_bytes_left(gbc), frame->height * frame->width / 2);
     698           0 :             return AVERROR_INVALIDDATA;
     699             :         }
     700             : 
     701           0 :         for (y = 0; y < frame->height; y++) {
     702           0 :             for (x = 0; x < frame->width; x += 2) {
     703           0 :                 uint8_t val = bytestream2_get_byte(gbc);
     704           0 :                 dst[x    ] = val & 0xF;
     705           0 :                 dst[x + 1] = val >> 4;
     706             :             }
     707           0 :             dst += frame->linesize[0];
     708             :         }
     709             :     } else {
     710          36 :         int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
     711             : 
     712          36 :         if (ctx->paletted) {
     713             :             int i;
     714             :             /* Use the first 1024 bytes as palette, then copy the rest. */
     715           4 :             bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
     716        1028 :             for (i = 0; i < 256; i++)
     717        1024 :                 AV_WN32(frame->data[1] + i*4,
     718             :                         (frame->data[1][2+i*4]<<0)+
     719             :                         (frame->data[1][1+i*4]<<8)+
     720             :                         (frame->data[1][0+i*4]<<16)+
     721             :                         ((unsigned)frame->data[1][3+i*4]<<24)
     722             :                 );
     723             : 
     724           4 :             frame->palette_has_changed = 1;
     725             :         }
     726             : 
     727          36 :         if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
     728           0 :             av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
     729           0 :                    bytestream2_get_bytes_left(gbc), frame->height * linesize);
     730           0 :             return AVERROR_INVALIDDATA;
     731             :         }
     732             : 
     733          36 :         av_image_copy_plane(frame->data[0], frame->linesize[0],
     734             :                             gbc->buffer, linesize,
     735             :                             linesize, frame->height);
     736             :     }
     737             : 
     738             :     /* Run any post processing here if needed. */
     739          96 :     if (ctx->postproc != DDS_NONE)
     740          28 :         run_postproc(avctx, frame);
     741             : 
     742             :     /* Frame is ready to be output. */
     743          96 :     frame->pict_type = AV_PICTURE_TYPE_I;
     744          96 :     frame->key_frame = 1;
     745          96 :     *got_frame = 1;
     746             : 
     747          96 :     return avpkt->size;
     748             : }
     749             : 
     750             : AVCodec ff_dds_decoder = {
     751             :     .name           = "dds",
     752             :     .long_name      = NULL_IF_CONFIG_SMALL("DirectDraw Surface image decoder"),
     753             :     .type           = AVMEDIA_TYPE_VIDEO,
     754             :     .id             = AV_CODEC_ID_DDS,
     755             :     .decode         = dds_decode,
     756             :     .priv_data_size = sizeof(DDSContext),
     757             :     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
     758             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE
     759             : };

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