| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2017 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 "libavutil/mem.h" | ||
| 22 | #include "libavutil/opt.h" | ||
| 23 | #include "libavutil/pixdesc.h" | ||
| 24 | #include "avfilter.h" | ||
| 25 | #include "drawutils.h" | ||
| 26 | #include "internal.h" | ||
| 27 | #include "video.h" | ||
| 28 | |||
| 29 | typedef struct EntropyContext { | ||
| 30 | const AVClass *class; | ||
| 31 | |||
| 32 | int mode; | ||
| 33 | |||
| 34 | int nb_planes; | ||
| 35 | int planeheight[4]; | ||
| 36 | int planewidth[4]; | ||
| 37 | int depth; | ||
| 38 | int is_rgb; | ||
| 39 | uint8_t rgba_map[4]; | ||
| 40 | char planenames[4]; | ||
| 41 | int64_t *histogram; | ||
| 42 | } EntropyContext; | ||
| 43 | |||
| 44 | #define OFFSET(x) offsetof(EntropyContext, x) | ||
| 45 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | ||
| 46 | static const AVOption entropy_options[] = { | ||
| 47 | { "mode", "set kind of histogram entropy measurement", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "mode" }, | ||
| 48 | { "normal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "mode" }, | ||
| 49 | { "diff", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "mode" }, | ||
| 50 | { NULL } | ||
| 51 | }; | ||
| 52 | |||
| 53 | AVFILTER_DEFINE_CLASS(entropy); | ||
| 54 | |||
| 55 | static const enum AVPixelFormat pixfmts[] = { | ||
| 56 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, | ||
| 57 | AV_PIX_FMT_YUV440P, | ||
| 58 | AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P, | ||
| 59 | AV_PIX_FMT_YUVJ440P, | ||
| 60 | AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9, | ||
| 61 | AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10, | ||
| 62 | AV_PIX_FMT_YUV440P10, | ||
| 63 | AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12, | ||
| 64 | AV_PIX_FMT_YUV440P12, | ||
| 65 | AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14, | ||
| 66 | AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16, | ||
| 67 | AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, | ||
| 68 | AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16, | ||
| 69 | AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16, | ||
| 70 | AV_PIX_FMT_NONE | ||
| 71 | }; | ||
| 72 | |||
| 73 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 74 | { | ||
| 75 | ✗ | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
| 76 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 77 | ✗ | EntropyContext *s = ctx->priv; | |
| 78 | |||
| 79 | ✗ | s->nb_planes = desc->nb_components; | |
| 80 | |||
| 81 | ✗ | s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); | |
| 82 | ✗ | s->planeheight[0] = s->planeheight[3] = inlink->h; | |
| 83 | ✗ | s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w); | |
| 84 | ✗ | s->planewidth[0] = s->planewidth[3] = inlink->w; | |
| 85 | |||
| 86 | ✗ | s->depth = desc->comp[0].depth; | |
| 87 | ✗ | s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0; | |
| 88 | |||
| 89 | ✗ | s->planenames[0] = s->is_rgb ? 'R' : 'Y'; | |
| 90 | ✗ | s->planenames[1] = s->is_rgb ? 'G' : 'U'; | |
| 91 | ✗ | s->planenames[2] = s->is_rgb ? 'B' : 'V'; | |
| 92 | ✗ | s->planenames[3] = 'A'; | |
| 93 | |||
| 94 | ✗ | s->histogram = av_malloc_array(1 << s->depth, sizeof(*s->histogram)); | |
| 95 | ✗ | if (!s->histogram) | |
| 96 | ✗ | return AVERROR(ENOMEM); | |
| 97 | |||
| 98 | ✗ | return 0; | |
| 99 | } | ||
| 100 | |||
| 101 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 102 | { | ||
| 103 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 104 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 105 | ✗ | EntropyContext *s = ctx->priv; | |
| 106 | int plane, y, x; | ||
| 107 | |||
| 108 | ✗ | for (plane = 0; plane < s->nb_planes; plane++) { | |
| 109 | ✗ | int cidx = s->is_rgb ? s->rgba_map[plane] : plane; | |
| 110 | ✗ | const uint8_t *src8 = in->data[plane]; | |
| 111 | ✗ | const uint16_t *src16 = (const uint16_t *)in->data[plane]; | |
| 112 | ✗ | float total = s->planewidth[plane] * s->planeheight[plane]; | |
| 113 | ✗ | float entropy = 0; | |
| 114 | char metabuf[128]; | ||
| 115 | char key[128]; | ||
| 116 | |||
| 117 | ✗ | memset(s->histogram, 0, (1 << s->depth) * sizeof(*s->histogram)); | |
| 118 | |||
| 119 | ✗ | if (s->depth <= 8) { | |
| 120 | ✗ | for (y = 0; y < s->planeheight[plane]; y++) { | |
| 121 | ✗ | for (x = 0; x < s->planewidth[plane]; x++) { | |
| 122 | ✗ | s->histogram[src8[x]]++; | |
| 123 | } | ||
| 124 | |||
| 125 | ✗ | src8 += in->linesize[plane]; | |
| 126 | } | ||
| 127 | } else { | ||
| 128 | ✗ | for (y = 0; y < s->planeheight[plane]; y++) { | |
| 129 | ✗ | for (x = 0; x < s->planewidth[plane]; x++) { | |
| 130 | ✗ | s->histogram[src16[x]]++; | |
| 131 | } | ||
| 132 | |||
| 133 | ✗ | src16 += in->linesize[plane] / 2; | |
| 134 | } | ||
| 135 | } | ||
| 136 | |||
| 137 | ✗ | for (y = 0; y < 1 << s->depth; y++) { | |
| 138 | ✗ | if (s->mode == 0) { | |
| 139 | ✗ | if (s->histogram[y]) { | |
| 140 | ✗ | float p = s->histogram[y] / total; | |
| 141 | ✗ | entropy += -log2(p) * p; | |
| 142 | } | ||
| 143 | ✗ | } else if (s->mode == 1) { | |
| 144 | ✗ | if (y && (s->histogram[y] - s->histogram[y - 1]) != 0) { | |
| 145 | ✗ | float p = FFABS(s->histogram[y] - s->histogram[y - 1]) / total; | |
| 146 | ✗ | entropy += -log2(p) * p; | |
| 147 | } | ||
| 148 | } | ||
| 149 | } | ||
| 150 | |||
| 151 | ✗ | snprintf(key, sizeof(key), "lavfi.entropy.entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]); | |
| 152 | ✗ | snprintf(metabuf, sizeof(metabuf), "%f", entropy); | |
| 153 | ✗ | av_dict_set(&in->metadata, key, metabuf, 0); | |
| 154 | ✗ | snprintf(key, sizeof(key), "lavfi.entropy.normalized_entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]); | |
| 155 | ✗ | snprintf(metabuf, sizeof(metabuf), "%f", entropy / log2(1 << s->depth)); | |
| 156 | ✗ | av_dict_set(&in->metadata, key, metabuf, 0); | |
| 157 | } | ||
| 158 | |||
| 159 | ✗ | return ff_filter_frame(outlink, in); | |
| 160 | } | ||
| 161 | |||
| 162 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 163 | { | ||
| 164 | ✗ | EntropyContext *s = ctx->priv; | |
| 165 | |||
| 166 | ✗ | av_freep(&s->histogram); | |
| 167 | ✗ | } | |
| 168 | |||
| 169 | static const AVFilterPad inputs[] = { | ||
| 170 | { | ||
| 171 | .name = "default", | ||
| 172 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 173 | .filter_frame = filter_frame, | ||
| 174 | .config_props = config_input, | ||
| 175 | }, | ||
| 176 | }; | ||
| 177 | |||
| 178 | const AVFilter ff_vf_entropy = { | ||
| 179 | .name = "entropy", | ||
| 180 | .description = NULL_IF_CONFIG_SMALL("Measure video frames entropy."), | ||
| 181 | .priv_size = sizeof(EntropyContext), | ||
| 182 | .uninit = uninit, | ||
| 183 | FILTER_INPUTS(inputs), | ||
| 184 | FILTER_OUTPUTS(ff_video_default_filterpad), | ||
| 185 | FILTER_PIXFMTS_ARRAY(pixfmts), | ||
| 186 | .priv_class = &entropy_class, | ||
| 187 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY, | ||
| 188 | }; | ||
| 189 |