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2ac7367f2f
And export both functions. This is needed for a following change that will make use of these functions from lavf. Signed-off-by: James Almer <jamrial@gmail.com>
100 lines
4.1 KiB
C
100 lines
4.1 KiB
C
/*
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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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#include <stdio.h>
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#include "libavutil/avassert.h"
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#include "libavutil/common.h"
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#include "libavutil/error.h"
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#include "libavutil/gain_map.h"
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#include "libavutil/mem.h"
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#include "libavutil/rational.h"
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#include "bytestream.h"
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#include "gain_map.h"
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int ff_gain_map_params_check_xmp(const AVGainMapParams *p)
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{
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if (av_gain_map_params_validate(p) < 0)
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return 0;
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if (p->version > FF_GAIN_MAP_VERSION)
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return 0; /* e.g. libraries out of sync */
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/* XMP gain maps only store one set of parameters (shared across channels),
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* have no way to describe a map applied in the alternate rendition's
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* color space, and explicitly reject no-op parameters */
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return (p->nb_channels == 1 || av_gain_map_channels_identical(p)) &&
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p->use_base_color_space &&
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av_cmp_q(p->alternate_hdr_headroom, p->base_hdr_headroom) != 0;
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}
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#define XMP_GAIN_MAP_TEMPLATE \
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"<x:xmpmeta xmlns:x=\"adobe:ns:meta/\" x:xmptk=\"XMP Core 5.5.0\">\n" \
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" <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\n" \
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" <rdf:Description rdf:about=\"\"\n" \
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" xmlns:hdrgm=\"" FF_GAIN_MAP_XMP_NAMESPACE "\"\n" \
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" hdrgm:Version=\"1.0\"\n" \
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" hdrgm:GainMapMin=\"%g\"\n" \
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" hdrgm:GainMapMax=\"%g\"\n" \
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" hdrgm:Gamma=\"%g\"\n" \
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" hdrgm:OffsetSDR=\"%g\"\n" \
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" hdrgm:OffsetHDR=\"%g\"\n" \
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" hdrgm:HDRCapacityMin=\"%g\"\n" \
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" hdrgm:HDRCapacityMax=\"%g\"\n" \
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" hdrgm:BaseRenditionIsHDR=\"%s\"/>\n" \
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" </rdf:RDF>\n" \
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"</x:xmpmeta>"
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static_assert(FF_GAIN_MAP_XMP_MAX_LEN > sizeof(XMP_GAIN_MAP_TEMPLATE) + 8 * 10,
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"XMP buffer too small for template and values");
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int ff_gain_map_params_to_xmp(const AVGainMapParams *p, char *buf)
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{
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if (!p || !buf)
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return AVERROR(EINVAL);
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if (!ff_gain_map_params_check_xmp(p))
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return AVERROR(ENOTSUP);
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const struct AVGainMapChannel *const ch = &p->channels[0];
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AVRational offset_sdr = ch->base_offset;
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AVRational offset_hdr = ch->alternate_offset;
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AVRational hdr_cap_min = p->base_hdr_headroom;
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AVRational hdr_cap_max = p->alternate_hdr_headroom;
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const int base_is_hdr = av_cmp_q(p->base_hdr_headroom,
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p->alternate_hdr_headroom) > 0;
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if (base_is_hdr) {
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FFSWAP(AVRational, offset_sdr, offset_hdr);
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FFSWAP(AVRational, hdr_cap_min, hdr_cap_max);
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}
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const size_t size = FF_GAIN_MAP_XMP_MAX_LEN;
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int ret = snprintf(buf, size, XMP_GAIN_MAP_TEMPLATE,
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av_q2d(ch->gain_map_min), av_q2d(ch->gain_map_max),
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av_q2d(ch->gamma),
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av_q2d(offset_sdr), av_q2d(offset_hdr),
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av_q2d(hdr_cap_min), av_q2d(hdr_cap_max),
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base_is_hdr ? "True" : "False");
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if (ret < 0 || ret >= size)
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return AVERROR_BUG;
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return ret;
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}
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