| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2021 Paul B Mahol | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include <float.h> | ||
| 22 | |||
| 23 | #include "libavutil/opt.h" | ||
| 24 | #include "avfilter.h" | ||
| 25 | #include "filters.h" | ||
| 26 | #include "video.h" | ||
| 27 | |||
| 28 | typedef struct ExposureContext { | ||
| 29 | const AVClass *class; | ||
| 30 | |||
| 31 | float exposure; | ||
| 32 | float black; | ||
| 33 | |||
| 34 | float scale; | ||
| 35 | int (*do_slice)(AVFilterContext *s, void *arg, | ||
| 36 | int jobnr, int nb_jobs); | ||
| 37 | } ExposureContext; | ||
| 38 | |||
| 39 | typedef struct ThreadData { | ||
| 40 | AVFrame *out, *in; | ||
| 41 | } ThreadData; | ||
| 42 | |||
| 43 | ✗ | static int exposure_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) | |
| 44 | { | ||
| 45 | ✗ | ExposureContext *s = ctx->priv; | |
| 46 | ✗ | ThreadData *td = arg; | |
| 47 | ✗ | const int width = td->out->width; | |
| 48 | ✗ | const int height = td->out->height; | |
| 49 | ✗ | const int slice_start = (height * jobnr) / nb_jobs; | |
| 50 | ✗ | const int slice_end = (height * (jobnr + 1)) / nb_jobs; | |
| 51 | ✗ | const float black = s->black; | |
| 52 | ✗ | const float scale = s->scale; | |
| 53 | |||
| 54 | ✗ | for (int p = 0; p < 3; p++) { | |
| 55 | ✗ | const int slinesize = td->in->linesize[p] / 4; | |
| 56 | ✗ | const int dlinesize = td->out->linesize[p] / 4; | |
| 57 | ✗ | const float *src = (const float *)td->in->data[p] + slice_start * slinesize; | |
| 58 | ✗ | float *ptr = (float *)td->out->data[p] + slice_start * dlinesize; | |
| 59 | ✗ | for (int y = slice_start; y < slice_end; y++) { | |
| 60 | ✗ | for (int x = 0; x < width; x++) | |
| 61 | ✗ | ptr[x] = (src[x] - black) * scale; | |
| 62 | |||
| 63 | ✗ | ptr += dlinesize; | |
| 64 | ✗ | src += slinesize; | |
| 65 | } | ||
| 66 | } | ||
| 67 | |||
| 68 | ✗ | if (td->in->data[3] && td->in->linesize[3] && td->in != td->out) { | |
| 69 | ✗ | const int slinesize = td->in->linesize[3] / 4; | |
| 70 | ✗ | const int dlinesize = td->out->linesize[3] / 4; | |
| 71 | ✗ | const float *src = (const float *)td->in->data[3] + slice_start * slinesize; | |
| 72 | ✗ | float *ptr = (float *)td->out->data[3] + slice_start * dlinesize; | |
| 73 | ✗ | for (int y = slice_start; y < slice_end; y++) { | |
| 74 | ✗ | memcpy(ptr, src, width * sizeof(*ptr)); | |
| 75 | ✗ | ptr += dlinesize; | |
| 76 | ✗ | src += slinesize; | |
| 77 | } | ||
| 78 | } | ||
| 79 | |||
| 80 | ✗ | return 0; | |
| 81 | } | ||
| 82 | |||
| 83 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 84 | { | ||
| 85 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 86 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 87 | ✗ | ExposureContext *s = ctx->priv; | |
| 88 | ✗ | float diff = fabsf(exp2f(-s->exposure) - s->black); | |
| 89 | ThreadData td; | ||
| 90 | AVFrame *out; | ||
| 91 | |||
| 92 | ✗ | if (av_frame_is_writable(in)) { | |
| 93 | ✗ | out = in; | |
| 94 | } else { | ||
| 95 | ✗ | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
| 96 | ✗ | if (!out) { | |
| 97 | ✗ | av_frame_free(&in); | |
| 98 | ✗ | return AVERROR(ENOMEM); | |
| 99 | } | ||
| 100 | ✗ | av_frame_copy_props(out, in); | |
| 101 | } | ||
| 102 | |||
| 103 | ✗ | diff = diff > 0.f ? diff : 1.f / 1024.f; | |
| 104 | ✗ | s->scale = 1.f / diff; | |
| 105 | ✗ | td.out = out; | |
| 106 | ✗ | td.in = in; | |
| 107 | ✗ | ff_filter_execute(ctx, s->do_slice, &td, NULL, | |
| 108 | ✗ | FFMIN(out->height, ff_filter_get_nb_threads(ctx))); | |
| 109 | |||
| 110 | ✗ | if (out != in) | |
| 111 | ✗ | av_frame_free(&in); | |
| 112 | ✗ | return ff_filter_frame(outlink, out); | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | static av_cold int config_input(AVFilterLink *inlink) | |
| 116 | { | ||
| 117 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 118 | ✗ | ExposureContext *s = ctx->priv; | |
| 119 | |||
| 120 | ✗ | s->do_slice = exposure_slice; | |
| 121 | |||
| 122 | ✗ | return 0; | |
| 123 | } | ||
| 124 | |||
| 125 | static const AVFilterPad exposure_inputs[] = { | ||
| 126 | { | ||
| 127 | .name = "default", | ||
| 128 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 129 | .filter_frame = filter_frame, | ||
| 130 | .config_props = config_input, | ||
| 131 | }, | ||
| 132 | }; | ||
| 133 | |||
| 134 | #define OFFSET(x) offsetof(ExposureContext, x) | ||
| 135 | #define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM | ||
| 136 | |||
| 137 | static const AVOption exposure_options[] = { | ||
| 138 | { "exposure", "set the exposure correction", OFFSET(exposure), AV_OPT_TYPE_FLOAT, {.dbl=0}, -3, 3, VF }, | ||
| 139 | { "black", "set the black level correction", OFFSET(black), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF }, | ||
| 140 | { NULL } | ||
| 141 | }; | ||
| 142 | |||
| 143 | AVFILTER_DEFINE_CLASS(exposure); | ||
| 144 | |||
| 145 | const AVFilter ff_vf_exposure = { | ||
| 146 | .name = "exposure", | ||
| 147 | .description = NULL_IF_CONFIG_SMALL("Adjust exposure of the video stream."), | ||
| 148 | .priv_size = sizeof(ExposureContext), | ||
| 149 | .priv_class = &exposure_class, | ||
| 150 | FILTER_INPUTS(exposure_inputs), | ||
| 151 | FILTER_OUTPUTS(ff_video_default_filterpad), | ||
| 152 | FILTER_PIXFMTS(AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32), | ||
| 153 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, | ||
| 154 | .process_command = ff_filter_process_command, | ||
| 155 | }; | ||
| 156 |