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n8.2-dev
libswscale/ops_backend.h
162 строки
7 KB
Niklas Haas
swscale/ops_backend: allocate block storage up-front
19 фев 2026, 22:44
19 фев 2026, 22:44
e729f49
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/** * 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 */ #ifndef SWSCALE_OPS_BACKEND_H #define SWSCALE_OPS_BACKEND_H /** * Helper macros for the C-based backend. * * To use these macros, the following types must be defined: * - PIXEL_TYPE should be one of SWS_PIXEL_* * - pixel_t should be the type of pixels * - block_t should be the type of blocks (groups of pixels) */ #include <assert.h> #include <float.h> #include <stdint.h> #include "libavutil/attributes.h" #include "libavutil/mem.h" #include "ops_chain.h" /** * Internal context holding per-iter execution data. The data pointers will be * directly incremented by the corresponding read/write functions. */ typedef struct SwsOpIter { const uint8_t *in[4]; uint8_t *out[4]; int x, y; } SwsOpIter; #ifdef __clang__ # define SWS_FUNC # define SWS_LOOP AV_PRAGMA(clang loop vectorize(assume_safety)) #elif defined(__GNUC__) # define SWS_FUNC __attribute__((optimize("tree-vectorize"))) # define SWS_LOOP AV_PRAGMA(GCC ivdep) #else # define SWS_FUNC # define SWS_LOOP #endif /* Miscellaneous helpers */ #define bitfn2(name, ext) name ## _ ## ext #define bitfn(name, ext) bitfn2(name, ext) #define FN_SUFFIX AV_JOIN(FMT_CHAR, BIT_DEPTH) #define fn(name) bitfn(name, FN_SUFFIX) #define av_q2pixel(q) ((q).den ? (pixel_t) (q).num / (q).den : 0) /* Helper macros to make writing common function signatures less painful */ #define DECL_FUNC(NAME, ...) \ static av_always_inline void fn(NAME)(SwsOpIter *restrict iter, \ const SwsOpImpl *restrict impl, \ block_t x, block_t y, \ block_t z, block_t w, \ __VA_ARGS__) #define DECL_READ(NAME, ...) \ DECL_FUNC(NAME, const pixel_t *restrict in0, const pixel_t *restrict in1, \ const pixel_t *restrict in2, const pixel_t *restrict in3, \ __VA_ARGS__) #define DECL_WRITE(NAME, ...) \ DECL_FUNC(NAME, pixel_t *restrict out0, pixel_t *restrict out1, \ pixel_t *restrict out2, pixel_t *restrict out3, \ __VA_ARGS__) /* Helper macros to call into functions declared with DECL_FUNC_* */ #define CALL(FUNC, ...) \ fn(FUNC)(iter, impl, x, y, z, w, __VA_ARGS__) #define CALL_READ(FUNC, ...) \ CALL(FUNC, (const pixel_t *) iter->in[0], (const pixel_t *) iter->in[1], \ (const pixel_t *) iter->in[2], (const pixel_t *) iter->in[3], \ __VA_ARGS__) #define CALL_WRITE(FUNC, ...) \ CALL(FUNC, (pixel_t *) iter->out[0], (pixel_t *) iter->out[1], \ (pixel_t *) iter->out[2], (pixel_t *) iter->out[3], __VA_ARGS__) /* Helper macros to declare continuation functions */ #define DECL_IMPL(NAME) \ static SWS_FUNC void fn(NAME)(SwsOpIter *restrict iter, \ const SwsOpImpl *restrict impl, \ block_t x, block_t y, \ block_t z, block_t w) /* Helper macro to call into the next continuation with a given type */ #define CONTINUE(TYPE, ...) \ ((void (*)(SwsOpIter *, const SwsOpImpl *, \ TYPE x, TYPE y, TYPE z, TYPE w)) impl->cont) \ (iter, &impl[1], __VA_ARGS__) /* Helper macros for common op setup code */ #define DECL_SETUP(NAME) \ static int fn(NAME)(const SwsOp *op, SwsOpPriv *out) #define SETUP_MEMDUP(c) ff_setup_memdup(&(c), sizeof(c), out) static inline int ff_setup_memdup(const void *c, size_t size, SwsOpPriv *out) { out->ptr = av_memdup(c, size); return out->ptr ? 0 : AVERROR(ENOMEM); } /* Helper macro for declaring op table entries */ #define DECL_ENTRY(NAME, ...) \ static const SwsOpEntry fn(op_##NAME) = { \ .func = (SwsFuncPtr) fn(NAME), \ .type = PIXEL_TYPE, \ __VA_ARGS__ \ } /* Helpers to define functions for common subsets of components */ #define DECL_PATTERN(NAME) \ DECL_FUNC(NAME, const bool X, const bool Y, const bool Z, const bool W) #define WRAP_PATTERN(FUNC, X, Y, Z, W, ...) \ DECL_IMPL(FUNC##_##X##Y##Z##W) \ { \ CALL(FUNC, X, Y, Z, W); \ } \ \ DECL_ENTRY(FUNC##_##X##Y##Z##W, \ .unused = { !X, !Y, !Z, !W }, \ __VA_ARGS__ \ ) #define WRAP_COMMON_PATTERNS(FUNC, ...) \ WRAP_PATTERN(FUNC, 1, 0, 0, 0, __VA_ARGS__); \ WRAP_PATTERN(FUNC, 1, 0, 0, 1, __VA_ARGS__); \ WRAP_PATTERN(FUNC, 1, 1, 1, 0, __VA_ARGS__); \ WRAP_PATTERN(FUNC, 1, 1, 1, 1, __VA_ARGS__) #define REF_COMMON_PATTERNS(NAME) \ &fn(op_##NAME##_1000), \ &fn(op_##NAME##_1001), \ &fn(op_##NAME##_1110), \ &fn(op_##NAME##_1111) #endif