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FFmpeg/libavfilter/vf_unsharp.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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/*
* Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
* Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
* Relicensed to the LGPL with permission from Remi Guyomarch.
*
* 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
*/
/**
* @file
* blur / sharpen filter, ported to FFmpeg from MPlayer
* libmpcodecs/unsharp.c.
*
* This code is based on:
*
* An Efficient algorithm for Gaussian blur using finite-state machines
* Frederick M. Waltz and John W. V. Miller
*
* SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
* Originally published Boston, Nov 98
*
* http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
*/
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "unsharp.h"
typedef struct TheadData {
UnsharpFilterParam *fp;
uint8_t *dst;
const uint8_t *src;
int dst_stride;
int src_stride;
int width;
int height;
} ThreadData;
#define DEF_UNSHARP_SLICE_FUNC(name, nbits) \
static int name##_##nbits(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
ThreadData *td = arg; \
UnsharpFilterParam *fp = td->fp; \
UnsharpContext *s = ctx->priv; \
uint32_t **sc = fp->sc; \
uint32_t *sr = fp->sr; \
const uint##nbits##_t *src2 = NULL; \
const int amount = fp->amount; \
const int steps_x = fp->steps_x; \
const int steps_y = fp->steps_y; \
const int scalebits = fp->scalebits; \
const int32_t halfscale = fp->halfscale; \
\
uint##nbits##_t *dst = (uint##nbits##_t*)td->dst; \
const uint##nbits##_t *src = (const uint##nbits##_t *)td->src; \
int dst_stride = td->dst_stride; \
int src_stride = td->src_stride; \
const int width = td->width; \
const int height = td->height; \
const int sc_offset = jobnr * 2 * steps_y; \
const int sr_offset = jobnr * (MAX_MATRIX_SIZE - 1); \
const int slice_start = (height * jobnr) / nb_jobs; \
const int slice_end = (height * (jobnr+1)) / nb_jobs; \
\
int32_t res; \
int x, y, z; \
uint32_t tmp1, tmp2; \
\
if (!amount) { \
av_image_copy_plane(td->dst + slice_start * dst_stride, dst_stride, \
td->src + slice_start * src_stride, src_stride, \
width * s->bps, slice_end - slice_start); \
return 0; \
} \
\
for (y = 0; y < 2 * steps_y; y++) \
memset(sc[sc_offset + y], 0, sizeof(sc[y][0]) * (width + 2 * steps_x)); \
\
dst_stride = dst_stride / s->bps; \
src_stride = src_stride / s->bps; \
/* if this is not the first tile, we start from (slice_start - steps_y) */ \
/* so we can get smooth result at slice boundary */ \
if (slice_start > steps_y) { \
src += (slice_start - steps_y) * src_stride; \
dst += (slice_start - steps_y) * dst_stride; \
} \
\
for (y = -steps_y + slice_start; y < steps_y + slice_end; y++) { \
if (y < height) \
src2 = src; \
\
memset(sr + sr_offset, 0, sizeof(sr[0]) * (2 * steps_x - 1)); \
for (x = -steps_x; x < width + steps_x; x++) { \
tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x]; \
for (z = 0; z < steps_x * 2; z += 2) { \
tmp2 = sr[sr_offset + z + 0] + tmp1; sr[sr_offset + z + 0] = tmp1; \
tmp1 = sr[sr_offset + z + 1] + tmp2; sr[sr_offset + z + 1] = tmp2; \
} \
for (z = 0; z < steps_y * 2; z += 2) { \
tmp2 = sc[sc_offset + z + 0][x + steps_x] + tmp1; \
sc[sc_offset + z + 0][x + steps_x] = tmp1; \
tmp1 = sc[sc_offset + z + 1][x + steps_x] + tmp2; \
sc[sc_offset + z + 1][x + steps_x] = tmp2; \
} \
if (x >= steps_x && y >= (steps_y + slice_start)) { \
const uint##nbits##_t *srx = src - steps_y * src_stride + x - steps_x; \
uint##nbits##_t *dsx = dst - steps_y * dst_stride + x - steps_x; \
\
res = (int32_t)*srx + ((((int32_t) * srx - \
(int32_t)((tmp1 + halfscale) >> scalebits)) * amount) >> (8+nbits)); \
*dsx = av_clip_uint##nbits(res); \
} \
} \
if (y >= 0) { \
dst += dst_stride; \
src += src_stride; \
} \
} \
return 0; \
}
DEF_UNSHARP_SLICE_FUNC(unsharp_slice, 16)
DEF_UNSHARP_SLICE_FUNC(unsharp_slice, 8)
static int apply_unsharp_c(AVFilterContext *ctx, AVFrame *in, AVFrame *out)
{
AVFilterLink *inlink = ctx->inputs[0];
UnsharpContext *s = ctx->priv;
int i, plane_w[3], plane_h[3];
UnsharpFilterParam *fp[3];
ThreadData td;
plane_w[0] = inlink->w;
plane_w[1] = plane_w[2] = AV_CEIL_RSHIFT(inlink->w, s->hsub);
plane_h[0] = inlink->h;
plane_h[1] = plane_h[2] = AV_CEIL_RSHIFT(inlink->h, s->vsub);
fp[0] = &s->luma;
fp[1] = fp[2] = &s->chroma;
for (i = 0; i < 3; i++) {
td.fp = fp[i];
td.dst = out->data[i];
td.src = in->data[i];
td.width = plane_w[i];
td.height = plane_h[i];
td.dst_stride = out->linesize[i];
td.src_stride = in->linesize[i];
ff_filter_execute(ctx, s->unsharp_slice, &td, NULL,
FFMIN(plane_h[i], s->nb_threads));
}
return 0;
}
static void set_filter_param(UnsharpFilterParam *fp, int msize_x, int msize_y, float amount)
{
fp->msize_x = msize_x;
fp->msize_y = msize_y;
fp->amount = amount * 65536.0;
fp->steps_x = msize_x / 2;
fp->steps_y = msize_y / 2;
fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
fp->halfscale = 1 << (fp->scalebits - 1);
}
static av_cold int init(AVFilterContext *ctx)
{
UnsharpContext *s = ctx->priv;
set_filter_param(&s->luma, s->lmsize_x, s->lmsize_y, s->lamount);
set_filter_param(&s->chroma, s->cmsize_x, s->cmsize_y, s->camount);
if (s->luma.scalebits >= 26 || s->chroma.scalebits >= 26) {
av_log(ctx, AV_LOG_ERROR, "luma or chroma matrix size too big\n");
return AVERROR(EINVAL);
}
s->apply_unsharp = apply_unsharp_c;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
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_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int init_filter_param(AVFilterContext *ctx, UnsharpFilterParam *fp, const char *effect_type, int width)
{
int z;
UnsharpContext *s = ctx->priv;
const char *effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
if (!(fp->msize_x & fp->msize_y & 1)) {
av_log(ctx, AV_LOG_ERROR,
"Invalid even size for %s matrix size %dx%d\n",
effect_type, fp->msize_x, fp->msize_y);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
fp->sr = av_malloc_array((MAX_MATRIX_SIZE - 1) * s->nb_threads, sizeof(uint32_t));
fp->sc = av_calloc(fp->steps_y * s->nb_threads, 2 * sizeof(*fp->sc));
if (!fp->sr || !fp->sc)
return AVERROR(ENOMEM);
for (z = 0; z < 2 * fp->steps_y * s->nb_threads; z++)
if (!(fp->sc[z] = av_malloc_array(width + 2 * fp->steps_x,
sizeof(*(fp->sc[z])))))
return AVERROR(ENOMEM);
return 0;
}
static int config_input(AVFilterLink *inlink)
{
UnsharpContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
s->hsub = desc->log2_chroma_w;
s->vsub = desc->log2_chroma_h;
s->bitdepth = desc->comp[0].depth;
s->bps = s->bitdepth > 8 ? 2 : 1;
s->unsharp_slice = s->bitdepth > 8 ? unsharp_slice_16 : unsharp_slice_8;
// ensure (height / nb_threads) > 4 * steps_y,
// so that we don't have too much overlap between two threads
s->nb_threads = FFMIN(ff_filter_get_nb_threads(inlink->dst),
inlink->h / (4 * s->luma.steps_y));
ret = init_filter_param(inlink->dst, &s->luma, "luma", inlink->w);
if (ret < 0)
return ret;
ret = init_filter_param(inlink->dst, &s->chroma, "chroma", AV_CEIL_RSHIFT(inlink->w, s->hsub));
if (ret < 0)
return ret;
return 0;
}
static void free_filter_param(UnsharpFilterParam *fp, int nb_threads)
{
int z;
if (fp->sc) {
for (z = 0; z < 2 * fp->steps_y * nb_threads; z++)
av_freep(&fp->sc[z]);
av_freep(&fp->sc);
}
av_freep(&fp->sr);
}
static av_cold void uninit(AVFilterContext *ctx)
{
UnsharpContext *s = ctx->priv;
free_filter_param(&s->luma, s->nb_threads);
free_filter_param(&s->chroma, s->nb_threads);
}
static int filter_frame(AVFilterLink *link, AVFrame *in)
{
UnsharpContext *s = link->dst->priv;
AVFilterLink *outlink = link->dst->outputs[0];
AVFrame *out;
int ret = 0;
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);
ret = s->apply_unsharp(link->dst, in, out);
av_frame_free(&in);
if (ret < 0) {
av_frame_free(&out);
return ret;
}
return ff_filter_frame(outlink, out);
}
#define OFFSET(x) offsetof(UnsharpContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define MIN_SIZE 3
#define MAX_SIZE 23
static const AVOption unsharp_options[] = {
{ "luma_msize_x", "set luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "lx", "set luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "luma_msize_y", "set luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "ly", "set luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "luma_amount", "set luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
{ "la", "set luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
{ "chroma_msize_x", "set chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "cx", "set chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "chroma_msize_y", "set chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "cy", "set chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
{ "chroma_amount", "set chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
{ "ca", "set chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
{ "opencl", "ignored", OFFSET(opencl), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(unsharp);
static const AVFilterPad avfilter_vf_unsharp_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad avfilter_vf_unsharp_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_unsharp = {
.name = "unsharp",
.description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
.priv_size = sizeof(UnsharpContext),
.priv_class = &unsharp_class,
.init = init,
.uninit = uninit,
FILTER_INPUTS(avfilter_vf_unsharp_inputs),
FILTER_OUTPUTS(avfilter_vf_unsharp_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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