virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-11-23 21:54:53 +02:00
Code Issues Releases Activity
Files
f4421457291c1ffa8db328c806d73b844b3e3450
FFmpeg/libswscale/ops_tmpl_float.c
Niklas Haas 5aef513fb4 swscale/ops_backend: add reference backend basend on C templates 
This will serve as a reference for the SIMD backends to come. That said,
with auto-vectorization enabled, the performance of this is not atrocious.
It easily beats the old C code and sometimes even the old SIMD.

In theory, we can dramatically speed it up by using GCC vectors instead of
arrays, but the performance gains from this are too dependent on exact GCC
versions and flags, so it practice it's not a substitute for a SIMD
implementation.
2025-09-01 19:28:36 +02:00

258 lines
8.7 KiB
C
Raw Blame History

/**
* Copyright (C) 2025 Niklas Haas
*
* 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
*/
#include "libavutil/avassert.h"
#include "ops_backend.h"
#ifndef BIT_DEPTH
# define BIT_DEPTH 32
#endif
#if BIT_DEPTH == 32
# define PIXEL_TYPE SWS_PIXEL_F32
# define PIXEL_MAX FLT_MAX
# define PIXEL_MIN FLT_MIN
# define pixel_t float
# define block_t f32block_t
# define px f32
#else
# error Invalid BIT_DEPTH
#endif
#define IS_FLOAT 1
#define FMT_CHAR f
#include "ops_tmpl_common.c"
DECL_SETUP(setup_dither)
{
const int size = 1 << op->dither.size_log2;
if (!size) {
/* We special case this value */
av_assert1(!av_cmp_q(op->dither.matrix[0], av_make_q(1, 2)));
out->ptr = NULL;
return 0;
}
const int width = FFMAX(size, SWS_BLOCK_SIZE);
pixel_t *matrix = out->ptr = av_malloc(sizeof(pixel_t) * size * width);
if (!matrix)
return AVERROR(ENOMEM);
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++)
matrix[y * width + x] = av_q2pixel(op->dither.matrix[y * size + x]);
for (int x = size; x < width; x++) /* pad to block size */
matrix[y * width + x] = matrix[y * width + (x % size)];
}
return 0;
}
DECL_FUNC(dither, const int size_log2)
{
const pixel_t *restrict matrix = impl->priv.ptr;
const int mask = (1 << size_log2) - 1;
const int y_line = iter->y;
const int row0 = (y_line + 0) & mask;
const int row1 = (y_line + 3) & mask;
const int row2 = (y_line + 2) & mask;
const int row3 = (y_line + 5) & mask;
const int size = 1 << size_log2;
const int width = FFMAX(size, SWS_BLOCK_SIZE);
const int base = iter->x & ~(SWS_BLOCK_SIZE - 1) & (size - 1);
SWS_LOOP
for (int i = 0; i < SWS_BLOCK_SIZE; i++) {
x[i] += size_log2 ? matrix[row0 * width + base + i] : (pixel_t) 0.5;
y[i] += size_log2 ? matrix[row1 * width + base + i] : (pixel_t) 0.5;
z[i] += size_log2 ? matrix[row2 * width + base + i] : (pixel_t) 0.5;
w[i] += size_log2 ? matrix[row3 * width + base + i] : (pixel_t) 0.5;
}
CONTINUE(block_t, x, y, z, w);
}
#define WRAP_DITHER(N) \
DECL_IMPL(dither##N) \
{ \
CALL(dither, N); \
} \
\
DECL_ENTRY(dither##N, \
.op = SWS_OP_DITHER, \
.dither_size = N, \
.setup = fn(setup_dither), \
.free = av_free, \
);
WRAP_DITHER(0)
WRAP_DITHER(1)
WRAP_DITHER(2)
WRAP_DITHER(3)
WRAP_DITHER(4)
WRAP_DITHER(5)
WRAP_DITHER(6)
WRAP_DITHER(7)
WRAP_DITHER(8)
typedef struct {
/* Stored in split form for convenience */
pixel_t m[4][4];
pixel_t k[4];
} fn(LinCoeffs);
DECL_SETUP(setup_linear)
{
fn(LinCoeffs) c;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++)
c.m[i][j] = av_q2pixel(op->lin.m[i][j]);
c.k[i] = av_q2pixel(op->lin.m[i][4]);
}
return SETUP_MEMDUP(c);
}
/**
* Fully general case for a 5x5 linear affine transformation. Should never be
* called without constant `mask`. This function will compile down to the
* appropriately optimized version for the required subset of operations when
* called with a constant mask.
*/
DECL_FUNC(linear_mask, const uint32_t mask)
{
const fn(LinCoeffs) c = *(const fn(LinCoeffs) *) impl->priv.ptr;
SWS_LOOP
for (int i = 0; i < SWS_BLOCK_SIZE; i++) {
const pixel_t xx = x[i];
const pixel_t yy = y[i];
const pixel_t zz = z[i];
const pixel_t ww = w[i];
x[i] = (mask & SWS_MASK_OFF(0)) ? c.k[0] : 0;
x[i] += (mask & SWS_MASK(0, 0)) ? c.m[0][0] * xx : xx;
x[i] += (mask & SWS_MASK(0, 1)) ? c.m[0][1] * yy : 0;
x[i] += (mask & SWS_MASK(0, 2)) ? c.m[0][2] * zz : 0;
x[i] += (mask & SWS_MASK(0, 3)) ? c.m[0][3] * ww : 0;
y[i] = (mask & SWS_MASK_OFF(1)) ? c.k[1] : 0;
y[i] += (mask & SWS_MASK(1, 0)) ? c.m[1][0] * xx : 0;
y[i] += (mask & SWS_MASK(1, 1)) ? c.m[1][1] * yy : yy;
y[i] += (mask & SWS_MASK(1, 2)) ? c.m[1][2] * zz : 0;
y[i] += (mask & SWS_MASK(1, 3)) ? c.m[1][3] * ww : 0;
z[i] = (mask & SWS_MASK_OFF(2)) ? c.k[2] : 0;
z[i] += (mask & SWS_MASK(2, 0)) ? c.m[2][0] * xx : 0;
z[i] += (mask & SWS_MASK(2, 1)) ? c.m[2][1] * yy : 0;
z[i] += (mask & SWS_MASK(2, 2)) ? c.m[2][2] * zz : zz;
z[i] += (mask & SWS_MASK(2, 3)) ? c.m[2][3] * ww : 0;
w[i] = (mask & SWS_MASK_OFF(3)) ? c.k[3] : 0;
w[i] += (mask & SWS_MASK(3, 0)) ? c.m[3][0] * xx : 0;
w[i] += (mask & SWS_MASK(3, 1)) ? c.m[3][1] * yy : 0;
w[i] += (mask & SWS_MASK(3, 2)) ? c.m[3][2] * zz : 0;
w[i] += (mask & SWS_MASK(3, 3)) ? c.m[3][3] * ww : ww;
}
CONTINUE(block_t, x, y, z, w);
}
#define WRAP_LINEAR(NAME, MASK) \
DECL_IMPL(linear_##NAME) \
{ \
CALL(linear_mask, MASK); \
} \
\
DECL_ENTRY(linear_##NAME, \
.op = SWS_OP_LINEAR, \
.setup = fn(setup_linear), \
.free = av_free, \
.linear_mask = (MASK), \
);
WRAP_LINEAR(luma, SWS_MASK_LUMA)
WRAP_LINEAR(alpha, SWS_MASK_ALPHA)
WRAP_LINEAR(lumalpha, SWS_MASK_LUMA | SWS_MASK_ALPHA)
WRAP_LINEAR(dot3, 0x7)
WRAP_LINEAR(row0, SWS_MASK_ROW(0))
WRAP_LINEAR(row0a, SWS_MASK_ROW(0) | SWS_MASK_ALPHA)
WRAP_LINEAR(diag3, SWS_MASK_DIAG3)
WRAP_LINEAR(diag4, SWS_MASK_DIAG4)
WRAP_LINEAR(diagoff3, SWS_MASK_DIAG3 | SWS_MASK_OFF3)
WRAP_LINEAR(matrix3, SWS_MASK_MAT3)
WRAP_LINEAR(affine3, SWS_MASK_MAT3 | SWS_MASK_OFF3)
WRAP_LINEAR(affine3a, SWS_MASK_MAT3 | SWS_MASK_OFF3 | SWS_MASK_ALPHA)
WRAP_LINEAR(matrix4, SWS_MASK_MAT4)
WRAP_LINEAR(affine4, SWS_MASK_MAT4 | SWS_MASK_OFF4)
static const SwsOpTable fn(op_table_float) = {
.block_size = SWS_BLOCK_SIZE,
.entries = {
REF_COMMON_PATTERNS(convert_uint8),
REF_COMMON_PATTERNS(convert_uint16),
REF_COMMON_PATTERNS(convert_uint32),
&fn(op_clear_1110),
REF_COMMON_PATTERNS(min),
REF_COMMON_PATTERNS(max),
REF_COMMON_PATTERNS(scale),
&fn(op_dither0),
&fn(op_dither1),
&fn(op_dither2),
&fn(op_dither3),
&fn(op_dither4),
&fn(op_dither5),
&fn(op_dither6),
&fn(op_dither7),
&fn(op_dither8),
&fn(op_linear_luma),
&fn(op_linear_alpha),
&fn(op_linear_lumalpha),
&fn(op_linear_dot3),
&fn(op_linear_row0),
&fn(op_linear_row0a),
&fn(op_linear_diag3),
&fn(op_linear_diag4),
&fn(op_linear_diagoff3),
&fn(op_linear_matrix3),
&fn(op_linear_affine3),
&fn(op_linear_affine3a),
&fn(op_linear_matrix4),
&fn(op_linear_affine4),
NULL
},
};
#undef PIXEL_TYPE
#undef PIXEL_MAX
#undef PIXEL_MIN
#undef pixel_t
#undef block_t
#undef px
#undef FMT_CHAR
#undef IS_FLOAT
Reference in New Issue View Git Blame Copy Permalink