libavfilter/vf_amplify.c

   1 /*
   2  * Copyright (c) 2018 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/imgutils.h"
  22 #include "libavutil/mem.h"
  23 #include "libavutil/opt.h"
  24 #include "libavutil/pixdesc.h"
  25
  26 #include "avfilter.h"
  27 #include "filters.h"
  28 #include "video.h"
  29
  30 typedef struct AmplifyContext {
  31     const AVClass *class;
  32     const AVPixFmtDescriptor *desc;
  33     int radius;
  34     float factor;
  35     float threshold;
  36     float tolerance;
  37     int planes;
  38
  39     float llimit;
  40     float hlimit;
  41     int nb_inputs;
  42     int nb_frames;
  43
  44     int depth;
  45     int nb_planes;
  46     int linesize[4];
  47     int height[4];
  48
  49     AVFrame **frames;
  50 } AmplifyContext;
  51
  52 static const enum AVPixelFormat pixel_fmts[] = {
  53     AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
  54     AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
  55     AV_PIX_FMT_GRAY16, AV_PIX_FMT_GRAYF32,
  56     AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
  57     AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
  58     AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
  59     AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
  60     AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
  61     AV_PIX_FMT_YUVJ411P,
  62     AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
  63     AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
  64     AV_PIX_FMT_YUV440P10,
  65     AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
  66     AV_PIX_FMT_YUV440P12,
  67     AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
  68     AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
  69     AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
  70     AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
  71     AV_PIX_FMT_YUVA420P,  AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA444P,
  72     AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
  73     AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
  74     AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
  75     AV_PIX_FMT_GBRAP,     AV_PIX_FMT_GBRAP10,    AV_PIX_FMT_GBRAP12,    AV_PIX_FMT_GBRAP16,
  76     AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32,
  77     AV_PIX_FMT_NONE
  78 };
  79
  80 static av_cold int init(AVFilterContext *ctx)
  81 {
  82     AmplifyContext *s = ctx->priv;
  83
  84     s->nb_inputs = s->radius * 2 + 1;
  85
  86     s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
  87     if (!s->frames)
  88         return AVERROR(ENOMEM);
  89
  90     return 0;
  91 }
  92
  93 typedef struct ThreadData {
  94     AVFrame **in, *out;
  95 } ThreadData;
  96
  97 #define AMPLIFY_SLICE(type, stype, clip)                                                        \
  98     const stype limit[2] = { s->llimit, s->hlimit };                                            \
  99                                                                                                 \
 100     for (int p = 0; p < s->nb_planes; p++) {                                                    \
 101         const int slice_start = (s->height[p] * jobnr) / nb_jobs;                               \
 102         const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;                             \
 103         type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]);                    \
 104         ptrdiff_t dst_linesize = out->linesize[p] / sizeof(type);                               \
 105                                                                                                 \
 106         if (!((1 << p) & s->planes)) {                                                          \
 107             av_image_copy_plane((uint8_t *)dst, out->linesize[p],                               \
 108                                 in[radius]->data[p] + slice_start * in[radius]->linesize[p],    \
 109                                 in[radius]->linesize[p],                                        \
 110                                 s->linesize[p], slice_end - slice_start);                       \
 111             continue;                                                                           \
 112         }                                                                                       \
 113                                                                                                 \
 114         for (int y = slice_start; y < slice_end; y++) {                                         \
 115             for (int x = 0; x < s->linesize[p] / sizeof(type); x++) {                           \
 116                 stype src = *(type *)(in[radius]->data[p] + y * in[radius]->linesize[p] + x * sizeof(type));\
 117                 float diff, abs_diff, avg;                                                      \
 118                 stype sum = 0;                                                                  \
 119                                                                                                 \
 120                 for (int i = 0; i < nb_inputs; i++) {                                           \
 121                     sum += *(type *)(in[i]->data[p] + y * in[i]->linesize[p] + x * sizeof(type));\
 122                 }                                                                               \
 123                                                                                                 \
 124                 avg = sum * scale;                                                              \
 125                 diff = src - avg;                                                               \
 126                 abs_diff = fabsf(diff);                                                         \
 127                                                                                                 \
 128                 if (abs_diff < threshold && abs_diff > tolerance) {                             \
 129                     float amp = copysignf(fminf(abs_diff * factor, limit[diff >= 0]), diff);    \
 130                     dst[x] = clip(src + amp, depth);                                            \
 131                 } else {                                                                        \
 132                     dst[x] = src;                                                               \
 133                 }                                                                               \
 134             }                                                                                   \
 135                                                                                                 \
 136             dst += dst_linesize;                                                                \
 137         }                                                                                       \
 138     }
 139
 140 #define CLIP8(x, depth) av_clip_uint8(lrintf(x))
 141 #define CLIP16(x, depth) av_clip_uintp2_c(lrintf(x), depth)
 142 #define NOP(x, depth) (x)
 143
 144 static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 145 {
 146     AmplifyContext *s = ctx->priv;
 147     ThreadData *td = arg;
 148     AVFrame **in = td->in;
 149     AVFrame *out = td->out;
 150     const int radius = s->radius;
 151     const int nb_inputs = s->nb_inputs;
 152     const float threshold = s->threshold;
 153     const float tolerance = s->tolerance;
 154     const float scale = 1.f / nb_inputs;
 155     const float factor = s->factor;
 156     const int depth = s->depth;
 157
 158     if (s->depth <= 8) {
 159         AMPLIFY_SLICE(uint8_t, int, CLIP8)
 160     } else if (s->depth <= 16) {
 161         AMPLIFY_SLICE(uint16_t, int, CLIP16)
 162     } else {
 163         AMPLIFY_SLICE(float, float, NOP)
 164     }
 165
 166     return 0;
 167 }
 168
 169 static int config_output(AVFilterLink *outlink)
 170 {
 171     AVFilterContext *ctx = outlink->src;
 172     AmplifyContext *s = ctx->priv;
 173     AVFilterLink *inlink = ctx->inputs[0];
 174     int ret;
 175
 176     s->desc = av_pix_fmt_desc_get(outlink->format);
 177     if (!s->desc)
 178         return AVERROR_BUG;
 179     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
 180     s->depth = s->desc->comp[0].depth;
 181
 182     if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
 183         return ret;
 184
 185     s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
 186     s->height[0] = s->height[3] = inlink->h;
 187
 188     return 0;
 189 }
 190
 191 static av_cold void uninit(AVFilterContext *ctx)
 192 {
 193     AmplifyContext *s = ctx->priv;
 194     int i;
 195
 196     if (s->frames) {
 197         for (i = 0; i < s->nb_frames; i++)
 198             av_frame_free(&s->frames[i]);
 199     }
 200     av_freep(&s->frames);
 201 }
 202
 203 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 204 {
 205     AVFilterContext *ctx = inlink->dst;
 206     AVFilterLink *outlink = ctx->outputs[0];
 207     AmplifyContext *s = ctx->priv;
 208     ThreadData td;
 209     AVFrame *out;
 210
 211     if (s->nb_frames < s->nb_inputs) {
 212         s->frames[s->nb_frames] = in;
 213         s->nb_frames++;
 214         return 0;
 215     } else {
 216         av_frame_free(&s->frames[0]);
 217         memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
 218         s->frames[s->nb_inputs - 1] = in;
 219     }
 220
 221     if (!ctx->is_disabled) {
 222         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 223         if (!out)
 224             return AVERROR(ENOMEM);
 225         av_frame_copy_props(out, s->frames[0]);
 226
 227         td.out = out;
 228         td.in = s->frames;
 229         ff_filter_execute(ctx, amplify_frame, &td, NULL,
 230                           FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
 231     } else {
 232         out = av_frame_clone(s->frames[s->radius]);
 233         if (!out)
 234             return AVERROR(ENOMEM);
 235         out->pts = s->frames[0]->pts;
 236     }
 237
 238     return ff_filter_frame(outlink, out);
 239 }
 240
 241 #define OFFSET(x) offsetof(AmplifyContext, x)
 242 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
 243 #define VFT AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
 244
 245 static const AVOption amplify_options[] = {
 246     { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
 247     { "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = VFT },
 248     { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = VFT },
 249     { "tolerance", "set tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, UINT16_MAX, .flags = VFT },
 250     { "low", "set low limit for amplification", OFFSET(llimit), AV_OPT_TYPE_FLOAT, {.dbl=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
 251     { "high", "set high limit for amplification", OFFSET(hlimit), AV_OPT_TYPE_FLOAT, {.dbl=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
 252     { "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7},    0, 15,  VFT },
 253     { NULL },
 254 };
 255
 256 static const AVFilterPad inputs[] = {
 257     {
 258         .name          = "default",
 259         .type          = AVMEDIA_TYPE_VIDEO,
 260         .filter_frame  = filter_frame,
 261     },
 262 };
 263
 264 static const AVFilterPad outputs[] = {
 265     {
 266         .name          = "default",
 267         .type          = AVMEDIA_TYPE_VIDEO,
 268         .config_props  = config_output,
 269     },
 270 };
 271
 272 AVFILTER_DEFINE_CLASS(amplify);
 273
 274 const FFFilter ff_vf_amplify = {
 275     .p.name        = "amplify",
 276     .p.description = NULL_IF_CONFIG_SMALL("Amplify changes between successive video frames."),
 277     .p.priv_class  = &amplify_class,
 278     .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
 279     .priv_size     = sizeof(AmplifyContext),
 280     FILTER_OUTPUTS(outputs),
 281     FILTER_INPUTS(inputs),
 282     FILTER_PIXFMTS_ARRAY(pixel_fmts),
 283     .init          = init,
 284     .uninit        = uninit,
 285     .process_command = ff_filter_process_command,
 286 };