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FFmpeg/libavfilter/vf_avgblur.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) 2016 Paul B Mahol
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct AverageBlurContext {
const AVClass *class;
int radius;
int radiusV;
int planes;
int depth;
int max;
int area;
int planewidth[4];
int planeheight[4];
void *buffer;
uint16_t lut[256 * 256 * 256];
int nb_planes;
int (*filter[2])(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} AverageBlurContext;
#define OFFSET(x) offsetof(AverageBlurContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption avgblur_options[] = {
{ "sizeX", "set horizontal size", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=1}, 1, 1024, FLAGS },
{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
{ "sizeY", "set vertical size", OFFSET(radiusV), AV_OPT_TYPE_INT, {.i64=0}, 0, 1024, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(avgblur);
typedef struct ThreadData {
int height;
int width;
const void *ptr;
void *dptr;
int linesize, dlinesize;
} ThreadData;
#define LUT_DIV(sum, area) (lut[(sum)])
#define SLOW_DIV(sum, area) ((sum) / (area))
#define FILTER(name, type, btype, lutunused, areaunused, lutdiv) \
static int filter_##name(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
AverageBlurContext *s = ctx->priv; \
ThreadData *td = arg; \
areaunused const int area = s->area; \
lutunused const uint16_t *lut = s->lut; \
const int size_w = s->radius; \
const int size_h = s->radiusV; \
btype *col_sum = (btype *)s->buffer + size_w; \
const int dlinesize = td->dlinesize / sizeof(type); \
const int linesize = td->linesize / sizeof(type); \
const int height = td->height; \
const int width = td->width; \
const type *src = td->ptr; \
type *dst = td->dptr; \
btype sum = 0; \
\
for (int x = -size_w; x < 0; x++) { \
sum = src[0] * size_h; \
for (int y = 0; y <= size_h; y++) \
sum += src[y * linesize]; \
av_assert2(sum >= 0); \
col_sum[x] = sum; \
} \
\
for (int x = 0; x < width; x++) { \
sum = src[x] * size_h; \
for (int y = 0; y <= size_h; y++) \
sum += src[x + y * linesize]; \
av_assert2(sum >= 0); \
col_sum[x] = sum; \
} \
\
for (int x = width; x < width + size_w; x++) { \
sum = src[width - 1] * size_h; \
for (int y = 0; y <= size_h; y++) \
sum += src[width - 1 + y * linesize]; \
av_assert2(sum >= 0); \
col_sum[x] = sum; \
} \
\
sum = 0; \
for (int x = -size_w; x <= size_w; x++) \
sum += col_sum[x]; \
av_assert2(sum >= 0); \
dst[0] = lutdiv(sum, area); \
\
for (int x = 1; x < width; x++) { \
sum = sum - col_sum[x - size_w - 1] + col_sum[x + size_w]; \
av_assert2(sum >= 0); \
dst[x] = lutdiv(sum, area); \
} \
\
src = td->ptr; \
src += linesize; \
dst += dlinesize; \
\
for (int y = 1; y < height; y++) { \
const int syp = FFMIN(size_h, height - y - 1) * linesize; \
const int syn = FFMIN(y, size_h + 1) * linesize; \
\
sum = 0; \
\
for (int x = -size_w; x < 0; x++) \
col_sum[x] += src[0 + syp] - src[0 - syn]; \
\
for (int x = 0; x < width; x++) \
col_sum[x] += src[x + syp] - src[x - syn]; \
\
for (int x = width; x < width + size_w; x++) \
col_sum[x] += src[width - 1 + syp] - src[width - 1 - syn]; \
\
for (int x = -size_w; x <= size_w; x++) \
sum += col_sum[x]; \
av_assert2(sum >= 0); \
dst[0] = lutdiv(sum, area); \
\
for (int x = 1; x < width; x++) { \
sum = sum - col_sum[x - size_w - 1] + col_sum[x + size_w]; \
av_assert2(sum >= 0); \
dst[x] = lutdiv(sum, area); \
} \
\
src += linesize; \
dst += dlinesize; \
} \
\
return 0; \
}
FILTER(lut8, uint8_t, int32_t, , av_unused, LUT_DIV)
FILTER(lut16, uint16_t, int64_t, , av_unused, LUT_DIV)
FILTER(slow8, uint8_t, int32_t, av_unused, , SLOW_DIV)
FILTER(slow16, uint16_t, int64_t, av_unused, , SLOW_DIV)
static void build_lut(AVFilterContext *ctx, int max)
{
AverageBlurContext *s = ctx->priv;
const int area = (2 * s->radiusV + 1) * (2 * s->radius + 1);
s->area = area;
if (max * area >= FF_ARRAY_ELEMS(s->lut))
return;
for (int i = 0, j = 0, k = 0; i < max * area; i++, j++) {
if (j == area) {
k++;
j = 0;
}
s->lut[i] = k;
}
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
AverageBlurContext *s = ctx->priv;
s->depth = desc->comp[0].depth;
s->max = 1 << s->depth;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
s->buffer = av_calloc(inlink->w + (1024 * 2 + 1), 4 * ((s->depth + 7) / 8));
if (!s->buffer)
return AVERROR(ENOMEM);
if (s->radiusV <= 0)
s->radiusV = s->radius;
s->filter[0] = s->depth <= 8 ? filter_lut8 : filter_lut16;
s->filter[1] = s->depth <= 8 ? filter_slow8 : filter_slow16;
s->radius = FFMIN(s->planewidth[1] / 2, s->radius);
s->radiusV = FFMIN(s->planeheight[1] / 2, s->radiusV);
build_lut(ctx, s->max);
return 0;
}
static void averageiir2d(AVFilterContext *ctx, AVFrame *in, AVFrame *out, int plane)
{
AverageBlurContext *s = ctx->priv;
const int width = s->planewidth[plane];
const int height = s->planeheight[plane];
const int slow = (s->max * s->area) >= FF_ARRAY_ELEMS(s->lut);
ThreadData td;
td.width = width;
td.height = height;
td.ptr = in->data[plane];
td.linesize = in->linesize[plane];
td.dptr = out->data[plane];
td.dlinesize = out->linesize[plane];
s->filter[slow](ctx, &td, 0, 0);
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
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_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
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_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AverageBlurContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int plane;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
for (plane = 0; plane < s->nb_planes; plane++) {
const int height = s->planeheight[plane];
const int width = s->planewidth[plane];
if (!(s->planes & (1 << plane))) {
if (out != in)
av_image_copy_plane(out->data[plane], out->linesize[plane],
in->data[plane], in->linesize[plane],
width * ((s->depth + 7) / 8), height);
continue;
}
averageiir2d(ctx, in, out, plane);
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
AverageBlurContext *s = ctx->priv;
const int area = s->area;
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
if (s->radiusV <= 0)
s->radiusV = s->radius;
s->radius = FFMIN(s->planewidth[1] / 2, s->radius);
s->radiusV = FFMIN(s->planeheight[1] / 2, s->radiusV);
if (area != (2 * s->radiusV + 1) * (2 * s->radius + 1))
build_lut(ctx, s->max);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
AverageBlurContext *s = ctx->priv;
av_freep(&s->buffer);
}
static const AVFilterPad avgblur_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad avgblur_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_avgblur = {
.name = "avgblur",
.description = NULL_IF_CONFIG_SMALL("Apply Average Blur filter."),
.priv_size = sizeof(AverageBlurContext),
.priv_class = &avgblur_class,
.uninit = uninit,
FILTER_INPUTS(avgblur_inputs),
FILTER_OUTPUTS(avgblur_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
.process_command = process_command,
};
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