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ffmpeg/libavfilter/vf_amplify.c

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/*
* Copyright (c) 2018 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct AmplifyContext {
const AVClass *class;
const AVPixFmtDescriptor *desc;
int radius;
float factor;
float threshold;
float tolerance;
int planes;
float llimit;
float hlimit;
int nb_inputs;
int nb_frames;
int depth;
int nb_planes;
int linesize[4];
int height[4];
AVFrame **frames;
} AmplifyContext;
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_GRAY16, AV_PIX_FMT_GRAYF32,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32,
AV_PIX_FMT_NONE
};
static av_cold int init(AVFilterContext *ctx)
{
AmplifyContext *s = ctx->priv;
s->nb_inputs = s->radius * 2 + 1;
s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
return 0;
}
typedef struct ThreadData {
AVFrame **in, *out;
} ThreadData;
#define AMPLIFY_SLICE(type, stype, clip) \
const stype limit[2] = { s->llimit, s->hlimit }; \
\
for (int p = 0; p < s->nb_planes; p++) { \
const int slice_start = (s->height[p] * jobnr) / nb_jobs; \
const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs; \
type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
ptrdiff_t dst_linesize = out->linesize[p] / sizeof(type); \
\
if (!((1 << p) & s->planes)) { \
av_image_copy_plane((uint8_t *)dst, out->linesize[p], \
in[radius]->data[p] + slice_start * in[radius]->linesize[p], \
in[radius]->linesize[p], \
s->linesize[p], slice_end - slice_start); \
continue; \
} \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < s->linesize[p] / sizeof(type); x++) { \
stype src = *(type *)(in[radius]->data[p] + y * in[radius]->linesize[p] + x * sizeof(type));\
float diff, abs_diff, avg; \
stype sum = 0; \
\
for (int i = 0; i < nb_inputs; i++) { \
sum += *(type *)(in[i]->data[p] + y * in[i]->linesize[p] + x * sizeof(type));\
} \
\
avg = sum * scale; \
diff = src - avg; \
abs_diff = fabsf(diff); \
\
if (abs_diff < threshold && abs_diff > tolerance) { \
float amp = copysignf(fminf(abs_diff * factor, limit[diff >= 0]), diff); \
dst[x] = clip(src + amp, depth); \
} else { \
dst[x] = src; \
} \
} \
\
dst += dst_linesize; \
} \
}
#define CLIP8(x, depth) av_clip_uint8(lrintf(x))
#define CLIP16(x, depth) av_clip_uintp2_c(lrintf(x), depth)
#define NOP(x, depth) (x)
static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
AmplifyContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame **in = td->in;
AVFrame *out = td->out;
const int radius = s->radius;
const int nb_inputs = s->nb_inputs;
const float threshold = s->threshold;
const float tolerance = s->tolerance;
const float scale = 1.f / nb_inputs;
const float factor = s->factor;
const int depth = s->depth;
if (s->depth <= 8) {
AMPLIFY_SLICE(uint8_t, int, CLIP8)
} else if (s->depth <= 16) {
AMPLIFY_SLICE(uint16_t, int, CLIP16)
} else {
AMPLIFY_SLICE(float, float, NOP)
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AmplifyContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int ret;
s->desc = av_pix_fmt_desc_get(outlink->format);
if (!s->desc)
return AVERROR_BUG;
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
s->depth = s->desc->comp[0].depth;
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
s->height[0] = s->height[3] = inlink->h;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
AmplifyContext *s = ctx->priv;
int i;
if (s->frames) {
for (i = 0; i < s->nb_frames; i++)
av_frame_free(&s->frames[i]);
}
av_freep(&s->frames);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AmplifyContext *s = ctx->priv;
ThreadData td;
AVFrame *out;
if (s->nb_frames < s->nb_inputs) {
s->frames[s->nb_frames] = in;
s->nb_frames++;
return 0;
} else {
av_frame_free(&s->frames[0]);
memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
s->frames[s->nb_inputs - 1] = in;
}
if (!ctx->is_disabled) {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, s->frames[0]);
td.out = out;
td.in = s->frames;
ff_filter_execute(ctx, amplify_frame, &td, NULL,
FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
} else {
out = av_frame_clone(s->frames[s->radius]);
if (!out)
return AVERROR(ENOMEM);
out->pts = s->frames[0]->pts;
}
return ff_filter_frame(outlink, out);
}
#define OFFSET(x) offsetof(AmplifyContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
#define VFT AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption amplify_options[] = {
{ "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
{ "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = VFT },
{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = VFT },
{ "tolerance", "set tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, UINT16_MAX, .flags = VFT },
{ "low", "set low limit for amplification", OFFSET(llimit), AV_OPT_TYPE_FLOAT, {.dbl=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
{ "high", "set high limit for amplification", OFFSET(hlimit), AV_OPT_TYPE_FLOAT, {.dbl=UINT16_MAX}, 0, UINT16_MAX, .flags = VFT },
{ "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 0, 15, VFT },
{ NULL },
};
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
AVFILTER_DEFINE_CLASS(amplify);
const AVFilter ff_vf_amplify = {
.name = "amplify",
.description = NULL_IF_CONFIG_SMALL("Amplify changes between successive video frames."),
.priv_size = sizeof(AmplifyContext),
.priv_class = &amplify_class,
FILTER_OUTPUTS(outputs),
FILTER_INPUTS(inputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
.init = init,
.uninit = uninit,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};
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