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FFmpeg/libavfilter/vf_shufflepixels.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) 2020 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/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/lfg.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/random_seed.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct ShufflePixelsContext {
const AVClass *class;
int block_w, block_h;
int mode;
int direction;
int64_t seed;
int depth;
int nb_planes;
int linesize[4];
int planewidth[4];
int planeheight[4];
int nb_blocks;
uint8_t *used;
int32_t *map;
AVLFG c;
int (*shuffle_pixels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} ShufflePixelsContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static void make_horizontal_map(AVFilterContext *ctx)
{
ShufflePixelsContext *s = ctx->priv;
const int nb_blocks = s->nb_blocks;
AVLFG *c = &s->c;
uint8_t *used = s->used;
int32_t *map = s->map;
for (int x = 0; x < s->planewidth[0];) {
int rand = av_lfg_get(c) % nb_blocks;
if (used[rand] == 0) {
int width;
if (s->direction) {
width = FFMIN(s->block_w, s->planewidth[0] - x);
map[rand * s->block_w] = x;
} else {
width = FFMIN(s->block_w, s->planewidth[0] - rand * s->block_w);
map[x] = rand * s->block_w;
}
used[rand] = 1;
if (s->direction) {
for (int i = 1; i < width; i++) {
map[rand * s->block_w + i] = map[rand * s->block_w] + i;
}
} else {
for (int i = 1; i < width; i++) {
map[x + i] = map[x] + i;
}
}
x += width;
}
}
}
static void make_vertical_map(AVFilterContext *ctx)
{
ShufflePixelsContext *s = ctx->priv;
const int nb_blocks = s->nb_blocks;
AVLFG *c = &s->c;
uint8_t *used = s->used;
int32_t *map = s->map;
for (int y = 0; y < s->planeheight[0];) {
int rand = av_lfg_get(c) % nb_blocks;
if (used[rand] == 0) {
int height;
if (s->direction) {
height = FFMIN(s->block_h, s->planeheight[0] - y);
map[rand * s->block_h] = y;
} else {
height = FFMIN(s->block_h, s->planeheight[0] - rand * s->block_h);
map[y] = rand * s->block_h;
}
used[rand] = 1;
if (s->direction) {
for (int i = 1; i < height; i++) {
map[rand * s->block_h + i] = map[rand * s->block_h] + i;
}
} else {
for (int i = 1; i < height; i++) {
map[y + i] = map[y] + i;
}
}
y += height;
}
}
}
static void make_block_map(AVFilterContext *ctx)
{
ShufflePixelsContext *s = ctx->priv;
const int nb_blocks = s->nb_blocks;
int nb_blocks_w = s->planewidth[0] / s->block_w;
AVLFG *c = &s->c;
uint8_t *used = s->used;
int32_t *map = s->map;
for (int i = 0; i < nb_blocks;) {
int rand = av_lfg_get(c) % nb_blocks;
if (used[rand] == 0) {
int yin = i / nb_blocks_w;
int xin = i % nb_blocks_w;
int in = yin * s->block_h * s->planewidth[0] + xin * s->block_w;
int yout = rand / nb_blocks_w;
int xout = rand % nb_blocks_w;
int out = yout * s->block_h * s->planewidth[0] + xout * s->block_w;
if (s->direction) {
map[out] = in;
} else {
map[in] = out;
}
used[rand] = 1;
if (s->direction) {
for (int y = 0; y < s->block_h; y++) {
for (int x = 0; x < s->block_w; x++) {
map[out + y * s->planewidth[0] + x] = map[out] + x + y * s->planewidth[0];
}
}
} else {
for (int y = 0; y < s->block_h; y++) {
for (int x = 0; x < s->block_w; x++) {
map[in + y * s->planewidth[0] + x] = map[in] + x + y * s->planewidth[0];
}
}
}
i++;
}
}
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define SHUFFLE_HORIZONTAL(name, type) \
static int shuffle_horizontal## name(AVFilterContext *ctx, void *arg, \
int jobnr, int nb_jobs) \
{ \
ShufflePixelsContext *s = ctx->priv; \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
\
for (int p = 0; p < s->nb_planes; p++) { \
const int slice_start = (s->planeheight[p] * jobnr) / nb_jobs; \
const int slice_end = (s->planeheight[p] * (jobnr+1)) / nb_jobs; \
type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
const type *src = (const type *)(in->data[p] + \
slice_start * in->linesize[p]); \
const int32_t *map = s->map; \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < s->planewidth[p]; x++) { \
dst[x] = src[map[x]]; \
} \
\
dst += out->linesize[p] / sizeof(type); \
src += in->linesize[p] / sizeof(type); \
} \
} \
\
return 0; \
}
SHUFFLE_HORIZONTAL(8, uint8_t)
SHUFFLE_HORIZONTAL(16, uint16_t)
#define SHUFFLE_VERTICAL(name, type) \
static int shuffle_vertical## name(AVFilterContext *ctx, void *arg, \
int jobnr, int nb_jobs) \
{ \
ShufflePixelsContext *s = ctx->priv; \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
\
for (int p = 0; p < s->nb_planes; p++) { \
const int slice_start = (s->planeheight[p] * jobnr) / nb_jobs; \
const int slice_end = (s->planeheight[p] * (jobnr+1)) / nb_jobs; \
type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
const int32_t *map = s->map; \
\
for (int y = slice_start; y < slice_end; y++) { \
const type *src = (const type *)(in->data[p] + \
map[y] * in->linesize[p]); \
\
memcpy(dst, src, s->linesize[p]); \
dst += out->linesize[p] / sizeof(type); \
} \
} \
\
return 0; \
}
SHUFFLE_VERTICAL(8, uint8_t)
SHUFFLE_VERTICAL(16, uint16_t)
#define SHUFFLE_BLOCK(name, type) \
static int shuffle_block## name(AVFilterContext *ctx, void *arg, \
int jobnr, int nb_jobs) \
{ \
ShufflePixelsContext *s = ctx->priv; \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
\
for (int p = 0; p < s->nb_planes; p++) { \
const int slice_start = (s->planeheight[p] * jobnr) / nb_jobs; \
const int slice_end = (s->planeheight[p] * (jobnr+1)) / nb_jobs; \
type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
const type *src = (const type *)in->data[p]; \
const int32_t *map = s->map + slice_start * s->planewidth[p]; \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < s->planewidth[p]; x++) { \
int ymap = map[x] / s->planewidth[p]; \
int xmap = map[x] % s->planewidth[p]; \
\
dst[x] = src[xmap + ymap * in->linesize[p] / sizeof(type)]; \
} \
\
dst += out->linesize[p] / sizeof(type); \
map += s->planewidth[p]; \
} \
} \
\
return 0; \
}
SHUFFLE_BLOCK(8, uint8_t)
SHUFFLE_BLOCK(16, uint16_t)
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ShufflePixelsContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
const AVPixFmtDescriptor *desc;
int ret;
if (s->seed == -1)
s->seed = av_get_random_seed();
av_lfg_init(&s->c, s->seed);
desc = av_pix_fmt_desc_get(outlink->format);
if (!desc)
return AVERROR_BUG;
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
s->depth = desc->comp[0].depth;
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
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->map = av_calloc(inlink->w * inlink->h, sizeof(*s->map));
if (!s->map)
return AVERROR(ENOMEM);
switch (s->mode) {
case 0:
s->shuffle_pixels = s->depth <= 8 ? shuffle_horizontal8 : shuffle_horizontal16;
s->nb_blocks = (s->planewidth[0] + s->block_w - 1) / s->block_w;
break;
case 1:
s->shuffle_pixels = s->depth <= 8 ? shuffle_vertical8 : shuffle_vertical16;
s->nb_blocks = (s->planeheight[0] + s->block_h - 1) / s->block_h;
break;
case 2:
s->shuffle_pixels = s->depth <= 8 ? shuffle_block8 : shuffle_block16;
s->nb_blocks = (s->planeheight[0] / s->block_h) *
(s->planewidth[0] / s->block_w);
break;
default:
av_assert0(0);
}
s->used = av_calloc(s->nb_blocks, sizeof(*s->used));
if (!s->used)
return AVERROR(ENOMEM);
switch (s->mode) {
case 0:
make_horizontal_map(ctx);
break;
case 1:
make_vertical_map(ctx);
break;
case 2:
make_block_map(ctx);
break;
default:
av_assert0(0);
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
ShufflePixelsContext *s = ctx->priv;
AVFrame *out = ff_get_video_buffer(ctx->outputs[0], in->width, in->height);
ThreadData td;
int ret;
if (!out) {
ret = AVERROR(ENOMEM);
goto fail;
}
ret = av_frame_copy_props(out, in);
if (ret < 0) {
av_frame_free(&out);
goto fail;
}
td.out = out;
td.in = in;
ff_filter_execute(ctx, s->shuffle_pixels, &td, NULL,
FFMIN(s->planeheight[1], ff_filter_get_nb_threads(ctx)));
av_frame_free(&in);
return ff_filter_frame(ctx->outputs[0], out);
fail:
av_frame_free(&in);
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ShufflePixelsContext *s = ctx->priv;
av_freep(&s->map);
av_freep(&s->used);
}
#define OFFSET(x) offsetof(ShufflePixelsContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption shufflepixels_options[] = {
{ "direction", "set shuffle direction", OFFSET(direction), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "dir" },
{ "d", "set shuffle direction", OFFSET(direction), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "dir" },
{ "forward", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "dir" },
{ "inverse", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "dir" },
{ "mode", "set shuffle mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "mode" },
{ "m", "set shuffle mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "mode" },
{ "horizontal", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
{ "vertical", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
{ "block", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mode" },
{ "width", "set block width", OFFSET(block_w), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
{ "w", "set block width", OFFSET(block_w), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
{ "height", "set block height", OFFSET(block_h), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
{ "h", "set block height", OFFSET(block_h), AV_OPT_TYPE_INT, {.i64=10}, 1, 8000, FLAGS },
{ "seed", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT_MAX, FLAGS },
{ "s", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT_MAX, FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(shufflepixels);
static const AVFilterPad shufflepixels_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad shufflepixels_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_shufflepixels = {
.name = "shufflepixels",
.description = NULL_IF_CONFIG_SMALL("Shuffle video pixels."),
.priv_size = sizeof(ShufflePixelsContext),
.priv_class = &shufflepixels_class,
.uninit = uninit,
FILTER_INPUTS(shufflepixels_inputs),
FILTER_OUTPUTS(shufflepixels_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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