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FFmpeg/libavfilter/vf_xmedian.c

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/*
* Copyright (c) 2019 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/avstring.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/qsort.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "framesync.h"
#include "video.h"
typedef struct XMedianContext {
const AVClass *class;
const AVPixFmtDescriptor *desc;
int nb_inputs;
int planes;
int radius;
int depth;
int max;
int nb_planes;
int linesize[4];
int width[4];
int height[4];
AVFrame **frames;
FFFrameSync fs;
int (*median_frames)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} XMedianContext;
static int query_formats(AVFilterContext *ctx)
{
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_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_NONE
};
AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
if (!formats)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, formats);
}
static av_cold int init(AVFilterContext *ctx)
{
XMedianContext *s = ctx->priv;
int ret;
s->radius = s->nb_inputs / 2;
s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
for (int i = 0; i < s->nb_inputs; i++) {
AVFilterPad pad = { 0 };
pad.type = AVMEDIA_TYPE_VIDEO;
pad.name = av_asprintf("input%d", i);
if (!pad.name)
return AVERROR(ENOMEM);
if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
av_freep(&pad.name);
return ret;
}
}
return 0;
}
typedef struct ThreadData {
AVFrame **in, *out;
} ThreadData;
static int comparei(const void *p1, const void *p2)
{
int left = *(const int *)p1;
int right = *(const int *)p2;
return FFDIFFSIGN(left, right);
}
static int median_frames16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
XMedianContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame **in = td->in;
AVFrame *out = td->out;
const int nb_inputs = s->nb_inputs;
const int radius = s->radius;
int values[256];
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;
uint16_t *dst = (uint16_t *)(out->data[p] + slice_start * out->linesize[p]);
if (!((1 << p) & s->planes)) {
av_image_copy_plane((uint8_t *)dst, out->linesize[p],
in[0]->data[p] + slice_start * in[radius]->linesize[p],
in[0]->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->width[p]; x++) {
for (int i = 0; i < nb_inputs; i++) {
const uint16_t *src = (const uint16_t *)(in[i]->data[p] + y * in[i]->linesize[p]);
values[i] = src[x];
}
AV_QSORT(values, nb_inputs, int, comparei);
if (radius & 1)
dst[x] = values[radius];
else
dst[x] = (values[radius] + values[radius - 1]) >> 1;
}
dst += out->linesize[p] / 2;
}
}
return 0;
}
static int median_frames8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
XMedianContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame **in = td->in;
AVFrame *out = td->out;
const int nb_inputs = s->nb_inputs;
const int radius = s->radius;
int values[256];
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;
uint8_t *dst = out->data[p] + slice_start * out->linesize[p];
if (!((1 << p) & s->planes)) {
av_image_copy_plane(dst, out->linesize[p],
in[0]->data[p] + slice_start * in[0]->linesize[p],
in[0]->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->width[p]; x++) {
for (int i = 0; i < nb_inputs; i++)
values[i] = in[i]->data[p][y * in[i]->linesize[p] + x];
AV_QSORT(values, nb_inputs, int, comparei);
if (radius & 1)
dst[x] = values[radius];
else
dst[x] = (values[radius] + values[radius - 1]) >> 1;
}
dst += out->linesize[p];
}
}
return 0;
}
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
AVFilterLink *outlink = ctx->outputs[0];
XMedianContext *s = fs->opaque;
AVFrame **in = s->frames;
AVFrame *out;
ThreadData td;
int i, ret;
for (i = 0; i < s->nb_inputs; i++) {
if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
return ret;
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
td.in = in;
td.out = out;
ctx->internal->execute(ctx, s->median_frames, &td, NULL, FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));
return ff_filter_frame(outlink, out);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
XMedianContext *s = ctx->priv;
AVRational frame_rate = ctx->inputs[0]->frame_rate;
AVRational sar = ctx->inputs[0]->sample_aspect_ratio;
AVFilterLink *inlink = ctx->inputs[0];
int height = ctx->inputs[0]->h;
int width = ctx->inputs[0]->w;
FFFrameSyncIn *in;
int i, ret;
for (int i = 1; i < s->nb_inputs; i++) {
if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
av_log(ctx, AV_LOG_ERROR, "Input %d size (%dx%d) does not match input %d size (%dx%d).\n", i, ctx->inputs[i]->w, ctx->inputs[i]->h, 0, width, height);
return AVERROR(EINVAL);
}
}
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;
s->max = (1 << s->depth) - 1;
if (s->depth <= 8)
s->median_frames = median_frames8;
else
s->median_frames = median_frames16;
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
s->width[1] = s->width[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
s->width[0] = s->width[3] = inlink->w;
s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
s->height[0] = s->height[3] = inlink->h;
outlink->w = width;
outlink->h = height;
outlink->frame_rate = frame_rate;
outlink->sample_aspect_ratio = sar;
if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
return ret;
in = s->fs.in;
s->fs.opaque = s;
s->fs.on_event = process_frame;
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
in[i].time_base = inlink->time_base;
in[i].sync = 1;
in[i].before = EXT_STOP;
in[i].after = EXT_STOP;
}
ret = ff_framesync_configure(&s->fs);
outlink->time_base = s->fs.time_base;
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
XMedianContext *s = ctx->priv;
ff_framesync_uninit(&s->fs);
av_freep(&s->frames);
for (int i = 0; i < ctx->nb_inputs; i++)
av_freep(&ctx->input_pads[i].name);
}
static int activate(AVFilterContext *ctx)
{
XMedianContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
#define OFFSET(x) offsetof(XMedianContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const AVOption xmedian_options[] = {
{ "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=3}, 3, 255, .flags = FLAGS },
{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, .flags = FLAGS },
{ NULL },
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFILTER_DEFINE_CLASS(xmedian);
AVFilter ff_vf_xmedian = {
.name = "xmedian",
.description = NULL_IF_CONFIG_SMALL("Pick median pixels from several video inputs."),
.priv_size = sizeof(XMedianContext),
.priv_class = &xmedian_class,
.query_formats = query_formats,
.outputs = outputs,
.init = init,
.uninit = uninit,
.activate = activate,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_SLICE_THREADS,
};
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