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https://github.com/FFmpeg/FFmpeg.git
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719a93f4e4
libavutil/color_utils contains some avpriv_ symbols that map
enum AVTransferCharacteristic values to gamma-curve approximations and
to the actual transfer functions to invert them (i.e. -> linear).
There's two issues with this:
(1) avpriv is evil and should be avoided whenever possible
(2) libavutil/csp.h exposes a public API for handling color that
already handles primaries and matricies
I don't see any reason this API has to be private, so this commit takes
the functionality from avutil/color_utils and merges it into avutil/csp
with an exposed av_ API rather than the previous avpriv_ API.
Every reference to the previous API has been updated to point to the
new one. color_utils.h has been deleted as well. This should not break
any applications as it only contained avpriv_ symbols in the first
place, so nothing in that header could be referenced by other
applications.
Signed-off-by: Leo Izen <leo.izen@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
311 lines
9.5 KiB
C
311 lines
9.5 KiB
C
/*
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* Copyright (c) 2022 Niklas Haas
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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 "libavutil/csp.h"
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#include "fflcms2.h"
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static void log_cb(cmsContext ctx, cmsUInt32Number error, const char *str)
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{
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FFIccContext *s = cmsGetContextUserData(ctx);
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av_log(s->avctx, AV_LOG_ERROR, "lcms2: [%"PRIu32"] %s\n", error, str);
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}
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int ff_icc_context_init(FFIccContext *s, void *avctx)
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{
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memset(s, 0, sizeof(*s));
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s->avctx = avctx;
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s->ctx = cmsCreateContext(NULL, s);
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if (!s->ctx)
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return AVERROR(ENOMEM);
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cmsSetLogErrorHandlerTHR(s->ctx, log_cb);
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return 0;
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}
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void ff_icc_context_uninit(FFIccContext *s)
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{
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for (int i = 0; i < FF_ARRAY_ELEMS(s->curves); i++)
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cmsFreeToneCurve(s->curves[i]);
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cmsDeleteContext(s->ctx);
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memset(s, 0, sizeof(*s));
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}
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static int get_curve(FFIccContext *s, enum AVColorTransferCharacteristic trc,
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cmsToneCurve **out_curve)
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{
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if (trc >= AVCOL_TRC_NB)
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return AVERROR_INVALIDDATA;
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if (s->curves[trc])
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goto done;
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switch (trc) {
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case AVCOL_TRC_LINEAR:
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s->curves[trc] = cmsBuildGamma(s->ctx, 1.0);
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break;
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case AVCOL_TRC_GAMMA22:
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s->curves[trc] = cmsBuildGamma(s->ctx, 2.2);
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break;
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case AVCOL_TRC_GAMMA28:
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s->curves[trc] = cmsBuildGamma(s->ctx, 2.8);
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break;
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case AVCOL_TRC_BT709:
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case AVCOL_TRC_SMPTE170M:
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case AVCOL_TRC_BT2020_10:
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case AVCOL_TRC_BT2020_12:
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s->curves[trc] = cmsBuildParametricToneCurve(s->ctx, 4, (double[5]) {
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/* γ = */ 1/0.45,
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/* a = */ 1/1.099296826809442,
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/* b = */ 1 - 1/1.099296826809442,
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/* c = */ 1/4.5,
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/* d = */ 4.5 * 0.018053968510807,
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});
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break;
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case AVCOL_TRC_SMPTE240M:
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s->curves[trc] = cmsBuildParametricToneCurve(s->ctx, 4, (double[5]) {
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/* γ = */ 1/0.45,
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/* a = */ 1/1.1115,
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/* b = */ 1 - 1/1.1115,
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/* c = */ 1/4.0,
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/* d = */ 4.0 * 0.0228,
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});
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break;
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case AVCOL_TRC_LOG:
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s->curves[trc] = cmsBuildParametricToneCurve(s->ctx, 8, (double[5]) {
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/* a = */ 1.0,
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/* b = */ 10.0,
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/* c = */ 2.0,
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/* d = */ -1.0,
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/* e = */ 0.0
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});
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break;
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case AVCOL_TRC_LOG_SQRT:
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s->curves[trc] = cmsBuildParametricToneCurve(s->ctx, 8, (double[5]) {
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/* a = */ 1.0,
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/* b = */ 10.0,
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/* c = */ 2.5,
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/* d = */ -1.0,
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/* e = */ 0.0
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});
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break;
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case AVCOL_TRC_IEC61966_2_1:
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s->curves[trc] = cmsBuildParametricToneCurve(s->ctx, 4, (double[5]) {
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/* γ = */ 2.4,
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/* a = */ 1/1.055,
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/* b = */ 1 - 1/1.055,
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/* c = */ 1/12.92,
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/* d = */ 12.92 * 0.0031308,
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});
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break;
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case AVCOL_TRC_SMPTE428:
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s->curves[trc] = cmsBuildParametricToneCurve(s->ctx, 2, (double[3]) {
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/* γ = */ 2.6,
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/* a = */ pow(52.37/48.0, 1/2.6),
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/* b = */ 0.0
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});
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break;
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/* Can't be represented using the existing parametric tone curves.
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* FIXME: use cmsBuildTabulatedToneCurveFloat instead */
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case AVCOL_TRC_IEC61966_2_4:
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case AVCOL_TRC_BT1361_ECG:
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case AVCOL_TRC_SMPTE2084:
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case AVCOL_TRC_ARIB_STD_B67:
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return AVERROR_PATCHWELCOME;
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default:
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return AVERROR_INVALIDDATA;
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}
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if (!s->curves[trc])
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return AVERROR(ENOMEM);
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done:
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*out_curve = s->curves[trc];
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return 0;
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}
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int ff_icc_profile_generate(FFIccContext *s,
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enum AVColorPrimaries color_prim,
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enum AVColorTransferCharacteristic color_trc,
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cmsHPROFILE *out_profile)
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{
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cmsToneCurve *tonecurve;
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const AVColorPrimariesDesc *prim;
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int ret;
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if (!(prim = av_csp_primaries_desc_from_id(color_prim)))
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return AVERROR_INVALIDDATA;
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if ((ret = get_curve(s, color_trc, &tonecurve)) < 0)
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return ret;
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*out_profile = cmsCreateRGBProfileTHR(s->ctx,
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&(cmsCIExyY) { av_q2d(prim->wp.x), av_q2d(prim->wp.y), 1.0 },
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&(cmsCIExyYTRIPLE) {
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.Red = { av_q2d(prim->prim.r.x), av_q2d(prim->prim.r.y), 1.0 },
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.Green = { av_q2d(prim->prim.g.x), av_q2d(prim->prim.g.y), 1.0 },
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.Blue = { av_q2d(prim->prim.b.x), av_q2d(prim->prim.b.y), 1.0 },
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},
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(cmsToneCurve *[3]) { tonecurve, tonecurve, tonecurve }
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);
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return *out_profile == NULL ? AVERROR(ENOMEM) : 0;
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}
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int ff_icc_profile_attach(FFIccContext *s, cmsHPROFILE profile, AVFrame *frame)
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{
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cmsUInt32Number size;
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AVBufferRef *buf;
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if (!cmsSaveProfileToMem(profile, NULL, &size))
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return AVERROR_EXTERNAL;
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buf = av_buffer_alloc(size);
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if (!buf)
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return AVERROR(ENOMEM);
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if (!cmsSaveProfileToMem(profile, buf->data, &size) || size != buf->size) {
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av_buffer_unref(&buf);
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return AVERROR_EXTERNAL;
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}
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if (!av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_ICC_PROFILE, buf)) {
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av_buffer_unref(&buf);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static av_always_inline void XYZ_xy(cmsCIEXYZ XYZ, AVCIExy *xy)
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{
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double k = 1.0 / (XYZ.X + XYZ.Y + XYZ.Z);
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xy->x = av_d2q(k * XYZ.X, 100000);
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xy->y = av_d2q(k * XYZ.Y, 100000);
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}
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int ff_icc_profile_read_primaries(FFIccContext *s, cmsHPROFILE profile,
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AVColorPrimariesDesc *out_primaries)
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{
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static const uint8_t testprimaries[4][3] = {
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{ 0xFF, 0, 0 }, /* red */
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{ 0, 0xFF, 0 }, /* green */
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{ 0, 0, 0xFF }, /* blue */
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{ 0xFF, 0xFF, 0xFF }, /* white */
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};
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AVWhitepointCoefficients *wp = &out_primaries->wp;
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AVPrimaryCoefficients *prim = &out_primaries->prim;
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cmsFloat64Number prev_adapt;
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cmsHPROFILE xyz;
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cmsHTRANSFORM tf;
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cmsCIEXYZ dst[4];
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xyz = cmsCreateXYZProfileTHR(s->ctx);
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if (!xyz)
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return AVERROR(ENOMEM);
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/* We need to use an unadapted observer to get the raw values */
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prev_adapt = cmsSetAdaptationStateTHR(s->ctx, 0.0);
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tf = cmsCreateTransformTHR(s->ctx, profile, TYPE_RGB_8, xyz, TYPE_XYZ_DBL,
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INTENT_ABSOLUTE_COLORIMETRIC,
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/* Note: These flags mostly don't do anything
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* anyway, but specify them regardless */
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cmsFLAGS_NOCACHE |
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cmsFLAGS_NOOPTIMIZE |
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cmsFLAGS_LOWRESPRECALC |
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cmsFLAGS_GRIDPOINTS(2));
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cmsSetAdaptationStateTHR(s->ctx, prev_adapt);
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cmsCloseProfile(xyz);
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if (!tf) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid ICC profile (e.g. CMYK)\n");
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return AVERROR_INVALIDDATA;
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}
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cmsDoTransform(tf, testprimaries, dst, 4);
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cmsDeleteTransform(tf);
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XYZ_xy(dst[0], &prim->r);
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XYZ_xy(dst[1], &prim->g);
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XYZ_xy(dst[2], &prim->b);
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XYZ_xy(dst[3], wp);
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return 0;
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}
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int ff_icc_profile_detect_transfer(FFIccContext *s, cmsHPROFILE profile,
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enum AVColorTransferCharacteristic *out_trc)
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{
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/* 8-bit linear grayscale ramp */
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static const uint8_t testramp[16][3] = {
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{ 1, 1, 1}, /* avoid exact zero due to log100 etc. */
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{ 17, 17, 17},
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{ 34, 34, 34},
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{ 51, 51, 51},
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{ 68, 68, 68},
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{ 85, 85, 85},
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{ 02, 02, 02},
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{119, 119, 119},
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{136, 136, 136},
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{153, 153, 153},
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{170, 170, 170},
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{187, 187, 187},
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{204, 204, 204},
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{221, 221, 221},
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{238, 238, 238},
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{255, 255, 255},
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};
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double dst[FF_ARRAY_ELEMS(testramp)];
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for (enum AVColorTransferCharacteristic trc = 0; trc < AVCOL_TRC_NB; trc++) {
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cmsToneCurve *tonecurve;
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cmsHPROFILE ref;
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cmsHTRANSFORM tf;
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double delta = 0.0;
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if (get_curve(s, trc, &tonecurve) < 0)
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continue;
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ref = cmsCreateGrayProfileTHR(s->ctx, cmsD50_xyY(), tonecurve);
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if (!ref)
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return AVERROR(ENOMEM);
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tf = cmsCreateTransformTHR(s->ctx, profile, TYPE_RGB_8, ref, TYPE_GRAY_DBL,
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INTENT_RELATIVE_COLORIMETRIC,
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cmsFLAGS_NOCACHE | cmsFLAGS_NOOPTIMIZE);
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cmsCloseProfile(ref);
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if (!tf) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid ICC profile (e.g. CMYK)\n");
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return AVERROR_INVALIDDATA;
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}
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cmsDoTransform(tf, testramp, dst, FF_ARRAY_ELEMS(dst));
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cmsDeleteTransform(tf);
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for (int i = 0; i < FF_ARRAY_ELEMS(dst); i++)
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delta += fabs(testramp[i][0] / 255.0 - dst[i]);
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if (delta < 0.01) {
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*out_trc = trc;
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return 0;
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}
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}
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*out_trc = AVCOL_TRC_UNSPECIFIED;
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return 0;
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}
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