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FFmpeg/libavfilter/vf_kerndeint.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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/*
* Copyright (c) 2012 Jeremy Tran
* Copyright (c) 2004 Tobias Diedrich
* Copyright (c) 2003 Donald A. Graft
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
/**
* @file
* Kernel Deinterlacer
* Ported from MPlayer libmpcodecs/vf_kerndeint.c.
*/
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
typedef struct KerndeintContext {
const AVClass *class;
int frame; ///< frame count, starting from 0
int thresh, map, order, sharp, twoway;
int vsub;
int is_packed_rgb;
uint8_t *tmp_data [4]; ///< temporary plane data buffer
int tmp_linesize[4]; ///< temporary plane byte linesize
int tmp_bwidth [4]; ///< temporary plane byte width
} KerndeintContext;
#define OFFSET(x) offsetof(KerndeintContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption kerndeint_options[] = {
{ "thresh", "set the threshold", OFFSET(thresh), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
{ "map", "set the map", OFFSET(map), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "order", "set the order", OFFSET(order), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "sharp", "set sharpening", OFFSET(sharp), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "twoway", "set twoway", OFFSET(twoway), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(kerndeint);
static av_cold void uninit(AVFilterContext *ctx)
{
KerndeintContext *kerndeint = ctx->priv;
av_freep(&kerndeint->tmp_data[0]);
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUYV422,
AV_PIX_FMT_ARGB, AV_PIX_FMT_0RGB,
AV_PIX_FMT_ABGR, AV_PIX_FMT_0BGR,
AV_PIX_FMT_RGBA, AV_PIX_FMT_RGB0,
AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int config_props(AVFilterLink *inlink)
{
KerndeintContext *kerndeint = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
kerndeint->is_packed_rgb = av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_RGB;
kerndeint->vsub = desc->log2_chroma_h;
ret = av_image_alloc(kerndeint->tmp_data, kerndeint->tmp_linesize,
inlink->w, inlink->h, inlink->format, 16);
if (ret < 0)
return ret;
memset(kerndeint->tmp_data[0], 0, ret);
if ((ret = av_image_fill_linesizes(kerndeint->tmp_bwidth, inlink->format, inlink->w)) < 0)
return ret;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
{
KerndeintContext *kerndeint = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *outpic;
const uint8_t *prvp; ///< Previous field's pixel line number n
const uint8_t *prvpp; ///< Previous field's pixel line number (n - 1)
const uint8_t *prvpn; ///< Previous field's pixel line number (n + 1)
const uint8_t *prvppp; ///< Previous field's pixel line number (n - 2)
const uint8_t *prvpnn; ///< Previous field's pixel line number (n + 2)
const uint8_t *prvp4p; ///< Previous field's pixel line number (n - 4)
const uint8_t *prvp4n; ///< Previous field's pixel line number (n + 4)
const uint8_t *srcp; ///< Current field's pixel line number n
const uint8_t *srcpp; ///< Current field's pixel line number (n - 1)
const uint8_t *srcpn; ///< Current field's pixel line number (n + 1)
const uint8_t *srcppp; ///< Current field's pixel line number (n - 2)
const uint8_t *srcpnn; ///< Current field's pixel line number (n + 2)
const uint8_t *srcp3p; ///< Current field's pixel line number (n - 3)
const uint8_t *srcp3n; ///< Current field's pixel line number (n + 3)
const uint8_t *srcp4p; ///< Current field's pixel line number (n - 4)
const uint8_t *srcp4n; ///< Current field's pixel line number (n + 4)
uint8_t *dstp, *dstp_saved;
const uint8_t *srcp_saved;
int src_linesize, psrc_linesize, dst_linesize, bwidth;
int x, y, plane, val, hi, lo, g, h, n = kerndeint->frame++;
double valf;
const int thresh = kerndeint->thresh;
const int order = kerndeint->order;
const int map = kerndeint->map;
const int sharp = kerndeint->sharp;
const int twoway = kerndeint->twoway;
const int is_packed_rgb = kerndeint->is_packed_rgb;
outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!outpic) {
av_frame_free(&inpic);
return AVERROR(ENOMEM);
}
av_frame_copy_props(outpic, inpic);
outpic->interlaced_frame = 0;
for (plane = 0; plane < 4 && inpic->data[plane] && inpic->linesize[plane]; plane++) {
h = plane == 0 ? inlink->h : AV_CEIL_RSHIFT(inlink->h, kerndeint->vsub);
bwidth = kerndeint->tmp_bwidth[plane];
srcp_saved = inpic->data[plane];
src_linesize = inpic->linesize[plane];
psrc_linesize = kerndeint->tmp_linesize[plane];
dstp_saved = outpic->data[plane];
dst_linesize = outpic->linesize[plane];
srcp = srcp_saved + (1 - order) * src_linesize;
dstp = dstp_saved + (1 - order) * dst_linesize;
for (y = 0; y < h; y += 2) {
memcpy(dstp, srcp, bwidth);
srcp += 2 * src_linesize;
dstp += 2 * dst_linesize;
}
// Copy through the lines that will be missed below.
memcpy(dstp_saved + order * dst_linesize, srcp_saved + (1 - order) * src_linesize, bwidth);
memcpy(dstp_saved + (2 + order ) * dst_linesize, srcp_saved + (3 - order) * src_linesize, bwidth);
memcpy(dstp_saved + (h - 2 + order) * dst_linesize, srcp_saved + (h - 1 - order) * src_linesize, bwidth);
memcpy(dstp_saved + (h - 4 + order) * dst_linesize, srcp_saved + (h - 3 - order) * src_linesize, bwidth);
/* For the other field choose adaptively between using the previous field
or the interpolant from the current field. */
prvp = kerndeint->tmp_data[plane] + 5 * psrc_linesize - (1 - order) * psrc_linesize;
prvpp = prvp - psrc_linesize;
prvppp = prvp - 2 * psrc_linesize;
prvp4p = prvp - 4 * psrc_linesize;
prvpn = prvp + psrc_linesize;
prvpnn = prvp + 2 * psrc_linesize;
prvp4n = prvp + 4 * psrc_linesize;
srcp = srcp_saved + 5 * src_linesize - (1 - order) * src_linesize;
srcpp = srcp - src_linesize;
srcppp = srcp - 2 * src_linesize;
srcp3p = srcp - 3 * src_linesize;
srcp4p = srcp - 4 * src_linesize;
srcpn = srcp + src_linesize;
srcpnn = srcp + 2 * src_linesize;
srcp3n = srcp + 3 * src_linesize;
srcp4n = srcp + 4 * src_linesize;
dstp = dstp_saved + 5 * dst_linesize - (1 - order) * dst_linesize;
for (y = 5 - (1 - order); y <= h - 5 - (1 - order); y += 2) {
for (x = 0; x < bwidth; x++) {
if (thresh == 0 || n == 0 ||
(abs((int)prvp[x] - (int)srcp[x]) > thresh) ||
(abs((int)prvpp[x] - (int)srcpp[x]) > thresh) ||
(abs((int)prvpn[x] - (int)srcpn[x]) > thresh)) {
if (map) {
g = x & ~3;
if (is_packed_rgb) {
AV_WB32(dstp + g, 0xffffffff);
x = g + 3;
} else if (inlink->format == AV_PIX_FMT_YUYV422) {
// y <- 235, u <- 128, y <- 235, v <- 128
AV_WB32(dstp + g, 0xeb80eb80);
x = g + 3;
} else {
dstp[x] = plane == 0 ? 235 : 128;
}
} else {
if (is_packed_rgb) {
hi = 255;
lo = 0;
} else if (inlink->format == AV_PIX_FMT_YUYV422) {
hi = x & 1 ? 240 : 235;
lo = 16;
} else {
hi = plane == 0 ? 235 : 240;
lo = 16;
}
if (sharp) {
if (twoway) {
valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x])
+ 0.170 * ((int)srcp[x] + (int)prvp[x])
- 0.116 * ((int)srcppp[x] + (int)srcpnn[x] + (int)prvppp[x] + (int)prvpnn[x])
- 0.026 * ((int)srcp3p[x] + (int)srcp3n[x])
+ 0.031 * ((int)srcp4p[x] + (int)srcp4n[x] + (int)prvp4p[x] + (int)prvp4n[x]);
} else {
valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x])
+ 0.170 * ((int)prvp[x])
- 0.116 * ((int)prvppp[x] + (int)prvpnn[x])
- 0.026 * ((int)srcp3p[x] + (int)srcp3n[x])
+ 0.031 * ((int)prvp4p[x] + (int)prvp4p[x]);
}
dstp[x] = av_clip(valf, lo, hi);
} else {
if (twoway) {
val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)srcp[x] + (int)prvp[x])
- (int)(srcppp[x]) - (int)(srcpnn[x])
- (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
} else {
val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)prvp[x])
- (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
}
dstp[x] = av_clip(val, lo, hi);
}
}
} else {
dstp[x] = srcp[x];
}
}
prvp += 2 * psrc_linesize;
prvpp += 2 * psrc_linesize;
prvppp += 2 * psrc_linesize;
prvpn += 2 * psrc_linesize;
prvpnn += 2 * psrc_linesize;
prvp4p += 2 * psrc_linesize;
prvp4n += 2 * psrc_linesize;
srcp += 2 * src_linesize;
srcpp += 2 * src_linesize;
srcppp += 2 * src_linesize;
srcp3p += 2 * src_linesize;
srcp4p += 2 * src_linesize;
srcpn += 2 * src_linesize;
srcpnn += 2 * src_linesize;
srcp3n += 2 * src_linesize;
srcp4n += 2 * src_linesize;
dstp += 2 * dst_linesize;
}
srcp = inpic->data[plane];
dstp = kerndeint->tmp_data[plane];
av_image_copy_plane(dstp, psrc_linesize, srcp, src_linesize, bwidth, h);
}
av_frame_free(&inpic);
return ff_filter_frame(outlink, outpic);
}
static const AVFilterPad kerndeint_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
},
};
static const AVFilterPad kerndeint_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_kerndeint = {
.name = "kerndeint",
.description = NULL_IF_CONFIG_SMALL("Apply kernel deinterlacing to the input."),
.priv_size = sizeof(KerndeintContext),
.priv_class = &kerndeint_class,
.uninit = uninit,
FILTER_INPUTS(kerndeint_inputs),
FILTER_OUTPUTS(kerndeint_outputs),
FILTER_QUERY_FUNC(query_formats),
};
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