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FFmpeg/libavcodec/dds.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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/*
* DirectDraw Surface image decoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* DDS decoder
*
* https://msdn.microsoft.com/en-us/library/bb943982%28v=vs.85%29.aspx
*/
#include <stdint.h>
#include "libavutil/libm.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "texturedsp.h"
#include "thread.h"
#define DDPF_FOURCC (1 << 2)
#define DDPF_PALETTE (1 << 5)
#define DDPF_NORMALMAP (1U << 31)
enum DDSPostProc {
DDS_NONE = 0,
DDS_ALPHA_EXP,
DDS_NORMAL_MAP,
DDS_RAW_YCOCG,
DDS_SWAP_ALPHA,
DDS_SWIZZLE_A2XY,
DDS_SWIZZLE_RBXG,
DDS_SWIZZLE_RGXB,
DDS_SWIZZLE_RXBG,
DDS_SWIZZLE_RXGB,
DDS_SWIZZLE_XGBR,
DDS_SWIZZLE_XRBG,
DDS_SWIZZLE_XGXR,
};
enum DDSDXGIFormat {
DXGI_FORMAT_R16G16B16A16_TYPELESS = 9,
DXGI_FORMAT_R16G16B16A16_FLOAT = 10,
DXGI_FORMAT_R16G16B16A16_UNORM = 11,
DXGI_FORMAT_R16G16B16A16_UINT = 12,
DXGI_FORMAT_R16G16B16A16_SNORM = 13,
DXGI_FORMAT_R16G16B16A16_SINT = 14,
DXGI_FORMAT_R8G8B8A8_TYPELESS = 27,
DXGI_FORMAT_R8G8B8A8_UNORM = 28,
DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29,
DXGI_FORMAT_R8G8B8A8_UINT = 30,
DXGI_FORMAT_R8G8B8A8_SNORM = 31,
DXGI_FORMAT_R8G8B8A8_SINT = 32,
DXGI_FORMAT_BC1_TYPELESS = 70,
DXGI_FORMAT_BC1_UNORM = 71,
DXGI_FORMAT_BC1_UNORM_SRGB = 72,
DXGI_FORMAT_BC2_TYPELESS = 73,
DXGI_FORMAT_BC2_UNORM = 74,
DXGI_FORMAT_BC2_UNORM_SRGB = 75,
DXGI_FORMAT_BC3_TYPELESS = 76,
DXGI_FORMAT_BC3_UNORM = 77,
DXGI_FORMAT_BC3_UNORM_SRGB = 78,
DXGI_FORMAT_BC4_TYPELESS = 79,
DXGI_FORMAT_BC4_UNORM = 80,
DXGI_FORMAT_BC4_SNORM = 81,
DXGI_FORMAT_BC5_TYPELESS = 82,
DXGI_FORMAT_BC5_UNORM = 83,
DXGI_FORMAT_BC5_SNORM = 84,
DXGI_FORMAT_B5G6R5_UNORM = 85,
DXGI_FORMAT_B8G8R8A8_UNORM = 87,
DXGI_FORMAT_B8G8R8X8_UNORM = 88,
DXGI_FORMAT_B8G8R8A8_TYPELESS = 90,
DXGI_FORMAT_B8G8R8A8_UNORM_SRGB = 91,
DXGI_FORMAT_B8G8R8X8_TYPELESS = 92,
DXGI_FORMAT_B8G8R8X8_UNORM_SRGB = 93,
};
typedef struct DDSContext {
TextureDSPContext texdsp;
GetByteContext gbc;
int compressed;
int paletted;
int bpp;
enum DDSPostProc postproc;
const uint8_t *tex_data; // Compressed texture
int tex_ratio; // Compression ratio
int slice_count; // Number of slices for threaded operations
/* Pointer to the selected compress or decompress function. */
int (*tex_funct)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
} DDSContext;
static int parse_pixel_format(AVCodecContext *avctx)
{
DDSContext *ctx = avctx->priv_data;
GetByteContext *gbc = &ctx->gbc;
uint32_t flags, fourcc, gimp_tag;
enum DDSDXGIFormat dxgi;
int size, bpp, r, g, b, a;
int alpha_exponent, ycocg_classic, ycocg_scaled, normal_map, array;
/* Alternative DDS implementations use reserved1 as custom header. */
bytestream2_skip(gbc, 4 * 3);
gimp_tag = bytestream2_get_le32(gbc);
alpha_exponent = gimp_tag == MKTAG('A', 'E', 'X', 'P');
ycocg_classic = gimp_tag == MKTAG('Y', 'C', 'G', '1');
ycocg_scaled = gimp_tag == MKTAG('Y', 'C', 'G', '2');
bytestream2_skip(gbc, 4 * 7);
/* Now the real DDPF starts. */
size = bytestream2_get_le32(gbc);
if (size != 32) {
av_log(avctx, AV_LOG_ERROR, "Invalid pixel format header %d.\n", size);
return AVERROR_INVALIDDATA;
}
flags = bytestream2_get_le32(gbc);
ctx->compressed = flags & DDPF_FOURCC;
ctx->paletted = flags & DDPF_PALETTE;
normal_map = flags & DDPF_NORMALMAP;
fourcc = bytestream2_get_le32(gbc);
if (ctx->compressed && ctx->paletted) {
av_log(avctx, AV_LOG_WARNING,
"Disabling invalid palette flag for compressed dds.\n");
ctx->paletted = 0;
}
bpp = ctx->bpp = bytestream2_get_le32(gbc); // rgbbitcount
r = bytestream2_get_le32(gbc); // rbitmask
g = bytestream2_get_le32(gbc); // gbitmask
b = bytestream2_get_le32(gbc); // bbitmask
a = bytestream2_get_le32(gbc); // abitmask
bytestream2_skip(gbc, 4); // caps
bytestream2_skip(gbc, 4); // caps2
bytestream2_skip(gbc, 4); // caps3
bytestream2_skip(gbc, 4); // caps4
bytestream2_skip(gbc, 4); // reserved2
av_log(avctx, AV_LOG_VERBOSE, "fourcc %s bpp %d "
"r 0x%x g 0x%x b 0x%x a 0x%x\n", av_fourcc2str(fourcc), bpp, r, g, b, a);
if (gimp_tag)
av_log(avctx, AV_LOG_VERBOSE, "and GIMP-DDS tag %s\n", av_fourcc2str(gimp_tag));
if (ctx->compressed)
avctx->pix_fmt = AV_PIX_FMT_RGBA;
if (ctx->compressed) {
switch (fourcc) {
case MKTAG('D', 'X', 'T', '1'):
ctx->tex_ratio = 8;
ctx->tex_funct = ctx->texdsp.dxt1a_block;
break;
case MKTAG('D', 'X', 'T', '2'):
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxt2_block;
break;
case MKTAG('D', 'X', 'T', '3'):
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxt3_block;
break;
case MKTAG('D', 'X', 'T', '4'):
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxt4_block;
break;
case MKTAG('D', 'X', 'T', '5'):
ctx->tex_ratio = 16;
if (ycocg_scaled)
ctx->tex_funct = ctx->texdsp.dxt5ys_block;
else if (ycocg_classic)
ctx->tex_funct = ctx->texdsp.dxt5y_block;
else
ctx->tex_funct = ctx->texdsp.dxt5_block;
break;
case MKTAG('R', 'X', 'G', 'B'):
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxt5_block;
/* This format may be considered as a normal map,
* but it is handled differently in a separate postproc. */
ctx->postproc = DDS_SWIZZLE_RXGB;
normal_map = 0;
break;
case MKTAG('A', 'T', 'I', '1'):
case MKTAG('B', 'C', '4', 'U'):
ctx->tex_ratio = 8;
ctx->tex_funct = ctx->texdsp.rgtc1u_block;
break;
case MKTAG('B', 'C', '4', 'S'):
ctx->tex_ratio = 8;
ctx->tex_funct = ctx->texdsp.rgtc1s_block;
break;
case MKTAG('A', 'T', 'I', '2'):
/* RGT2 variant with swapped R and G (3Dc)*/
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxn3dc_block;
break;
case MKTAG('B', 'C', '5', 'U'):
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.rgtc2u_block;
break;
case MKTAG('B', 'C', '5', 'S'):
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.rgtc2s_block;
break;
case MKTAG('U', 'Y', 'V', 'Y'):
ctx->compressed = 0;
avctx->pix_fmt = AV_PIX_FMT_UYVY422;
break;
case MKTAG('Y', 'U', 'Y', '2'):
ctx->compressed = 0;
avctx->pix_fmt = AV_PIX_FMT_YUYV422;
break;
case MKTAG('P', '8', ' ', ' '):
/* ATI Palette8, same as normal palette */
ctx->compressed = 0;
ctx->paletted = 1;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
break;
case MKTAG('G', '1', ' ', ' '):
ctx->compressed = 0;
avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
break;
case MKTAG('D', 'X', '1', '0'):
/* DirectX 10 extra header */
dxgi = bytestream2_get_le32(gbc);
bytestream2_skip(gbc, 4); // resourceDimension
bytestream2_skip(gbc, 4); // miscFlag
array = bytestream2_get_le32(gbc);
bytestream2_skip(gbc, 4); // miscFlag2
if (array != 0)
av_log(avctx, AV_LOG_VERBOSE,
"Found array of size %d (ignored).\n", array);
/* Only BC[1-5] are actually compressed. */
ctx->compressed = (dxgi >= 70) && (dxgi <= 84);
av_log(avctx, AV_LOG_VERBOSE, "DXGI format %d.\n", dxgi);
switch (dxgi) {
/* RGB types. */
case DXGI_FORMAT_R16G16B16A16_TYPELESS:
case DXGI_FORMAT_R16G16B16A16_FLOAT:
case DXGI_FORMAT_R16G16B16A16_UNORM:
case DXGI_FORMAT_R16G16B16A16_UINT:
case DXGI_FORMAT_R16G16B16A16_SNORM:
case DXGI_FORMAT_R16G16B16A16_SINT:
avctx->pix_fmt = AV_PIX_FMT_BGRA64;
break;
case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
avctx->colorspace = AVCOL_SPC_RGB;
case DXGI_FORMAT_R8G8B8A8_TYPELESS:
case DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT_R8G8B8A8_UINT:
case DXGI_FORMAT_R8G8B8A8_SNORM:
case DXGI_FORMAT_R8G8B8A8_SINT:
avctx->pix_fmt = AV_PIX_FMT_BGRA;
break;
case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
avctx->colorspace = AVCOL_SPC_RGB;
case DXGI_FORMAT_B8G8R8A8_TYPELESS:
case DXGI_FORMAT_B8G8R8A8_UNORM:
avctx->pix_fmt = AV_PIX_FMT_RGBA;
break;
case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
avctx->colorspace = AVCOL_SPC_RGB;
case DXGI_FORMAT_B8G8R8X8_TYPELESS:
case DXGI_FORMAT_B8G8R8X8_UNORM:
avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
break;
case DXGI_FORMAT_B5G6R5_UNORM:
avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
break;
/* Texture types. */
case DXGI_FORMAT_BC1_UNORM_SRGB:
avctx->colorspace = AVCOL_SPC_RGB;
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
ctx->tex_ratio = 8;
ctx->tex_funct = ctx->texdsp.dxt1a_block;
break;
case DXGI_FORMAT_BC2_UNORM_SRGB:
avctx->colorspace = AVCOL_SPC_RGB;
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxt3_block;
break;
case DXGI_FORMAT_BC3_UNORM_SRGB:
avctx->colorspace = AVCOL_SPC_RGB;
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.dxt5_block;
break;
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
ctx->tex_ratio = 8;
ctx->tex_funct = ctx->texdsp.rgtc1u_block;
break;
case DXGI_FORMAT_BC4_SNORM:
ctx->tex_ratio = 8;
ctx->tex_funct = ctx->texdsp.rgtc1s_block;
break;
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.rgtc2u_block;
break;
case DXGI_FORMAT_BC5_SNORM:
ctx->tex_ratio = 16;
ctx->tex_funct = ctx->texdsp.rgtc2s_block;
break;
default:
av_log(avctx, AV_LOG_ERROR,
"Unsupported DXGI format %d.\n", dxgi);
return AVERROR_INVALIDDATA;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported %s fourcc.\n", av_fourcc2str(fourcc));
return AVERROR_INVALIDDATA;
}
} else if (ctx->paletted) {
if (bpp == 8) {
avctx->pix_fmt = AV_PIX_FMT_PAL8;
} else {
av_log(avctx, AV_LOG_ERROR, "Unsupported palette bpp %d.\n", bpp);
return AVERROR_INVALIDDATA;
}
} else {
/* 4 bpp */
if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
avctx->pix_fmt = AV_PIX_FMT_PAL8;
/* 8 bpp */
else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
else if (bpp == 8 && r == 0 && g == 0 && b == 0 && a == 0xff)
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
/* 16 bpp */
else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
avctx->pix_fmt = AV_PIX_FMT_YA8;
else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
avctx->pix_fmt = AV_PIX_FMT_YA8;
ctx->postproc = DDS_SWAP_ALPHA;
}
else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0x8000)
avctx->pix_fmt = AV_PIX_FMT_RGB555LE; // alpha ignored
else if (bpp == 16 && r == 0xf800 && g == 0x7e0 && b == 0x1f && a == 0)
avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
/* 24 bpp */
else if (bpp == 24 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
avctx->pix_fmt = AV_PIX_FMT_BGR24;
/* 32 bpp */
else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
avctx->pix_fmt = AV_PIX_FMT_BGRA;
else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
avctx->pix_fmt = AV_PIX_FMT_RGBA;
/* give up */
else {
av_log(avctx, AV_LOG_ERROR, "Unknown pixel format "
"[bpp %d r 0x%x g 0x%x b 0x%x a 0x%x].\n", bpp, r, g, b, a);
return AVERROR_INVALIDDATA;
}
}
/* Set any remaining post-proc that should happen before frame is ready. */
if (alpha_exponent)
ctx->postproc = DDS_ALPHA_EXP;
else if (normal_map)
ctx->postproc = DDS_NORMAL_MAP;
else if (ycocg_classic && !ctx->compressed)
ctx->postproc = DDS_RAW_YCOCG;
/* ATI/NVidia variants sometimes add swizzling in bpp. */
switch (bpp) {
case MKTAG('A', '2', 'X', 'Y'):
ctx->postproc = DDS_SWIZZLE_A2XY;
break;
case MKTAG('x', 'G', 'B', 'R'):
ctx->postproc = DDS_SWIZZLE_XGBR;
break;
case MKTAG('x', 'R', 'B', 'G'):
ctx->postproc = DDS_SWIZZLE_XRBG;
break;
case MKTAG('R', 'B', 'x', 'G'):
ctx->postproc = DDS_SWIZZLE_RBXG;
break;
case MKTAG('R', 'G', 'x', 'B'):
ctx->postproc = DDS_SWIZZLE_RGXB;
break;
case MKTAG('R', 'x', 'B', 'G'):
ctx->postproc = DDS_SWIZZLE_RXBG;
break;
case MKTAG('x', 'G', 'x', 'R'):
ctx->postproc = DDS_SWIZZLE_XGXR;
break;
case MKTAG('A', '2', 'D', '5'):
ctx->postproc = DDS_NORMAL_MAP;
break;
}
return 0;
}
static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
int slice, int thread_nb)
{
DDSContext *ctx = avctx->priv_data;
AVFrame *frame = arg;
const uint8_t *d = ctx->tex_data;
int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
int h_block = avctx->coded_height / TEXTURE_BLOCK_H;
int x, y;
int start_slice, end_slice;
int base_blocks_per_slice = h_block / ctx->slice_count;
int remainder_blocks = h_block % ctx->slice_count;
/* When the frame height (in blocks) doesn't divide evenly between the
* number of slices, spread the remaining blocks evenly between the first
* operations */
start_slice = slice * base_blocks_per_slice;
/* Add any extra blocks (one per slice) that have been added before this slice */
start_slice += FFMIN(slice, remainder_blocks);
end_slice = start_slice + base_blocks_per_slice;
/* Add an extra block if there are still remainder blocks to be accounted for */
if (slice < remainder_blocks)
end_slice++;
for (y = start_slice; y < end_slice; y++) {
uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
int off = y * w_block;
for (x = 0; x < w_block; x++) {
ctx->tex_funct(p + x * 16, frame->linesize[0],
d + (off + x) * ctx->tex_ratio);
}
}
return 0;
}
static void do_swizzle(AVFrame *frame, int x, int y)
{
int i;
for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
uint8_t *src = frame->data[0] + i;
FFSWAP(uint8_t, src[x], src[y]);
}
}
static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
{
DDSContext *ctx = avctx->priv_data;
int i, x_off;
switch (ctx->postproc) {
case DDS_ALPHA_EXP:
/* Alpha-exponential mode divides each channel by the maximum
* R, G or B value, and stores the multiplying factor in the
* alpha channel. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing alpha exponent.\n");
for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
uint8_t *src = frame->data[0] + i;
int r = src[0];
int g = src[1];
int b = src[2];
int a = src[3];
src[0] = r * a / 255;
src[1] = g * a / 255;
src[2] = b * a / 255;
src[3] = 255;
}
break;
case DDS_NORMAL_MAP:
/* Normal maps work in the XYZ color space and they encode
* X in R or in A, depending on the texture type, Y in G and
* derive Z with a square root of the distance.
*
* http://www.realtimecollisiondetection.net/blog/?p=28 */
av_log(avctx, AV_LOG_DEBUG, "Post-processing normal map.\n");
x_off = ctx->tex_ratio == 8 ? 0 : 3;
for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
uint8_t *src = frame->data[0] + i;
int x = src[x_off];
int y = src[1];
int z = 127;
int d = (255 * 255 - x * x - y * y) / 2;
if (d > 0)
z = lrint(sqrtf(d));
src[0] = x;
src[1] = y;
src[2] = z;
src[3] = 255;
}
break;
case DDS_RAW_YCOCG:
/* Data is Y-Co-Cg-A and not RGBA, but they are represented
* with the same masks in the DDPF header. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing raw YCoCg.\n");
for (i = 0; i < frame->linesize[0] * frame->height; i += 4) {
uint8_t *src = frame->data[0] + i;
int a = src[0];
int cg = src[1] - 128;
int co = src[2] - 128;
int y = src[3];
src[0] = av_clip_uint8(y + co - cg);
src[1] = av_clip_uint8(y + cg);
src[2] = av_clip_uint8(y - co - cg);
src[3] = a;
}
break;
case DDS_SWAP_ALPHA:
/* Alpha and Luma are stored swapped. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
uint8_t *src = frame->data[0] + i;
FFSWAP(uint8_t, src[0], src[1]);
}
break;
case DDS_SWIZZLE_A2XY:
/* Swap R and G, often used to restore a standard RGTC2. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
do_swizzle(frame, 0, 1);
break;
case DDS_SWIZZLE_RBXG:
/* Swap G and A, then B and new A (G). */
av_log(avctx, AV_LOG_DEBUG, "Post-processing RBXG swizzle.\n");
do_swizzle(frame, 1, 3);
do_swizzle(frame, 2, 3);
break;
case DDS_SWIZZLE_RGXB:
/* Swap B and A. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing RGXB swizzle.\n");
do_swizzle(frame, 2, 3);
break;
case DDS_SWIZZLE_RXBG:
/* Swap G and A. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing RXBG swizzle.\n");
do_swizzle(frame, 1, 3);
break;
case DDS_SWIZZLE_RXGB:
/* Swap R and A (misleading name). */
av_log(avctx, AV_LOG_DEBUG, "Post-processing RXGB swizzle.\n");
do_swizzle(frame, 0, 3);
break;
case DDS_SWIZZLE_XGBR:
/* Swap B and A, then R and new A (B). */
av_log(avctx, AV_LOG_DEBUG, "Post-processing XGBR swizzle.\n");
do_swizzle(frame, 2, 3);
do_swizzle(frame, 0, 3);
break;
case DDS_SWIZZLE_XGXR:
/* Swap G and A, then R and new A (G), then new R (G) and new G (A).
* This variant does not store any B component. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing XGXR swizzle.\n");
do_swizzle(frame, 1, 3);
do_swizzle(frame, 0, 3);
do_swizzle(frame, 0, 1);
break;
case DDS_SWIZZLE_XRBG:
/* Swap G and A, then R and new A (G). */
av_log(avctx, AV_LOG_DEBUG, "Post-processing XRBG swizzle.\n");
do_swizzle(frame, 1, 3);
do_swizzle(frame, 0, 3);
break;
}
}
static int dds_decode(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
DDSContext *ctx = avctx->priv_data;
GetByteContext *gbc = &ctx->gbc;
AVFrame *frame = data;
int mipmap;
int ret;
int width, height;
ff_texturedsp_init(&ctx->texdsp);
bytestream2_init(gbc, avpkt->data, avpkt->size);
if (bytestream2_get_bytes_left(gbc) < 128) {
av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n",
bytestream2_get_bytes_left(gbc));
return AVERROR_INVALIDDATA;
}
if (bytestream2_get_le32(gbc) != MKTAG('D', 'D', 'S', ' ') ||
bytestream2_get_le32(gbc) != 124) { // header size
av_log(avctx, AV_LOG_ERROR, "Invalid DDS header.\n");
return AVERROR_INVALIDDATA;
}
bytestream2_skip(gbc, 4); // flags
height = bytestream2_get_le32(gbc);
width = bytestream2_get_le32(gbc);
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
avctx->width, avctx->height);
return ret;
}
/* Since codec is based on 4x4 blocks, size is aligned to 4. */
avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
bytestream2_skip(gbc, 4); // pitch
bytestream2_skip(gbc, 4); // depth
mipmap = bytestream2_get_le32(gbc);
if (mipmap != 0)
av_log(avctx, AV_LOG_VERBOSE, "Found %d mipmaps (ignored).\n", mipmap);
/* Extract pixel format information, considering additional elements
* in reserved1 and reserved2. */
ret = parse_pixel_format(avctx);
if (ret < 0)
return ret;
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0)
return ret;
if (ctx->compressed) {
int size = (avctx->coded_height / TEXTURE_BLOCK_H) *
(avctx->coded_width / TEXTURE_BLOCK_W) * ctx->tex_ratio;
ctx->slice_count = av_clip(avctx->thread_count, 1,
avctx->coded_height / TEXTURE_BLOCK_H);
if (bytestream2_get_bytes_left(gbc) < size) {
av_log(avctx, AV_LOG_ERROR,
"Compressed Buffer is too small (%d < %d).\n",
bytestream2_get_bytes_left(gbc), size);
return AVERROR_INVALIDDATA;
}
/* Use the decompress function on the texture, one block per thread. */
ctx->tex_data = gbc->buffer;
avctx->execute2(avctx, decompress_texture_thread, frame, NULL, ctx->slice_count);
} else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
uint8_t *dst = frame->data[0];
int x, y, i;
/* Use the first 64 bytes as palette, then copy the rest. */
bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
for (i = 0; i < 16; i++) {
AV_WN32(frame->data[1] + i*4,
(frame->data[1][2+i*4]<<0)+
(frame->data[1][1+i*4]<<8)+
(frame->data[1][0+i*4]<<16)+
((unsigned)frame->data[1][3+i*4]<<24)
);
}
frame->palette_has_changed = 1;
if (bytestream2_get_bytes_left(gbc) < frame->height * frame->width / 2) {
av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
bytestream2_get_bytes_left(gbc), frame->height * frame->width / 2);
return AVERROR_INVALIDDATA;
}
for (y = 0; y < frame->height; y++) {
for (x = 0; x < frame->width; x += 2) {
uint8_t val = bytestream2_get_byte(gbc);
dst[x ] = val & 0xF;
dst[x + 1] = val >> 4;
}
dst += frame->linesize[0];
}
} else {
int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
if (ctx->paletted) {
int i;
/* Use the first 1024 bytes as palette, then copy the rest. */
bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
for (i = 0; i < 256; i++)
AV_WN32(frame->data[1] + i*4,
(frame->data[1][2+i*4]<<0)+
(frame->data[1][1+i*4]<<8)+
(frame->data[1][0+i*4]<<16)+
((unsigned)frame->data[1][3+i*4]<<24)
);
frame->palette_has_changed = 1;
}
if (bytestream2_get_bytes_left(gbc) < frame->height * linesize) {
av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
bytestream2_get_bytes_left(gbc), frame->height * linesize);
return AVERROR_INVALIDDATA;
}
av_image_copy_plane(frame->data[0], frame->linesize[0],
gbc->buffer, linesize,
linesize, frame->height);
}
/* Run any post processing here if needed. */
if (ctx->postproc != DDS_NONE)
run_postproc(avctx, frame);
/* Frame is ready to be output. */
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
*got_frame = 1;
return avpkt->size;
}
const AVCodec ff_dds_decoder = {
.name = "dds",
.long_name = NULL_IF_CONFIG_SMALL("DirectDraw Surface image decoder"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DDS,
.decode = dds_decode,
.priv_data_size = sizeof(DDSContext),
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE
};
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