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ae84aa775f
utils.c is getting quite crowded, and I need a new place to dump a lot of format handling code for the ongoing rewrite. Rather than bloating this file even more, start splitting format handling helpers off into a new file. This also renames the existing utils.h header, which didn't really contain anything except the SwsFormat definition anyway (the prototypes for what should have been in utils.h are all still in the legacy swscale_internal.h).
136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/*
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* Copyright (C) 2024 Niklas Haas
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SWSCALE_FORMAT_H
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#define SWSCALE_FORMAT_H
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#include "libavutil/csp.h"
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#include "libavutil/pixdesc.h"
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#include "swscale.h"
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static inline int ff_q_isnan(const AVRational a)
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{
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return !a.num && !a.den;
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}
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/* Like av_cmp_q but considers NaN == NaN */
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static inline int ff_q_equal(const AVRational a, const AVRational b)
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{
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return (ff_q_isnan(a) && ff_q_isnan(b)) || !av_cmp_q(a, b);
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}
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static inline int ff_cie_xy_equal(const AVCIExy a, const AVCIExy b)
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{
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return ff_q_equal(a.x, b.x) && ff_q_equal(a.y, b.y);
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}
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static inline int ff_prim_equal(const AVPrimaryCoefficients *a,
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const AVPrimaryCoefficients *b)
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{
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return ff_cie_xy_equal(a->r, b->r) &&
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ff_cie_xy_equal(a->g, b->g) &&
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ff_cie_xy_equal(a->b, b->b);
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}
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enum {
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FIELD_TOP, /* top/even rows, or progressive */
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FIELD_BOTTOM, /* bottom/odd rows */
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};
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typedef struct SwsColor {
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enum AVColorPrimaries prim;
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enum AVColorTransferCharacteristic trc;
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AVPrimaryCoefficients gamut; /* mastering display gamut */
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AVRational min_luma; /* minimum luminance in nits */
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AVRational max_luma; /* maximum luminance in nits */
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AVRational frame_peak; /* per-frame/scene peak luminance, or 0 */
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AVRational frame_avg; /* per-frame/scene average luminance, or 0 */
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} SwsColor;
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static inline void ff_color_update_dynamic(SwsColor *dst, const SwsColor *src)
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{
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dst->frame_peak = src->frame_peak;
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dst->frame_avg = src->frame_avg;
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}
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/* Subset of AVFrame parameters that uniquely determine pixel representation */
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typedef struct SwsFormat {
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int width, height;
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int interlaced;
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enum AVPixelFormat format;
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enum AVColorRange range;
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enum AVColorSpace csp;
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enum AVChromaLocation loc;
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const AVPixFmtDescriptor *desc; /* convenience */
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SwsColor color;
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} SwsFormat;
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/**
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* This function also sanitizes and strips the input data, removing irrelevant
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* fields for certain formats.
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*/
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SwsFormat ff_fmt_from_frame(const AVFrame *frame, int field);
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static inline int ff_color_equal(const SwsColor *c1, const SwsColor *c2)
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{
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return c1->prim == c2->prim &&
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c1->trc == c2->trc &&
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ff_q_equal(c1->min_luma, c2->min_luma) &&
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ff_q_equal(c1->max_luma, c2->max_luma) &&
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ff_prim_equal(&c1->gamut, &c2->gamut);
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}
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/* Tests only the static components of a colorspace, ignoring dimensions and per-frame data */
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static inline int ff_props_equal(const SwsFormat *fmt1, const SwsFormat *fmt2)
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{
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return fmt1->interlaced == fmt2->interlaced &&
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fmt1->format == fmt2->format &&
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fmt1->range == fmt2->range &&
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fmt1->csp == fmt2->csp &&
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fmt1->loc == fmt2->loc &&
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ff_color_equal(&fmt1->color, &fmt2->color);
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}
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/* Tests only the static components of a colorspace, ignoring per-frame data */
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static inline int ff_fmt_equal(const SwsFormat *fmt1, const SwsFormat *fmt2)
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{
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return fmt1->width == fmt2->width &&
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fmt1->height == fmt2->height &&
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ff_props_equal(fmt1, fmt2);
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}
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static inline int ff_fmt_align(enum AVPixelFormat fmt)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (desc->flags & AV_PIX_FMT_FLAG_BAYER) {
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return 2;
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} else {
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return 1 << desc->log2_chroma_h;
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}
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}
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int ff_test_fmt(const SwsFormat *fmt, int output);
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/* Returns 1 if the formats are incomplete, 0 otherwise */
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int ff_infer_colors(SwsColor *src, SwsColor *dst);
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#endif /* SWSCALE_FORMAT_H */
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