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FFmpeg/libavfilter/vf_super2xsai.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) 2010 Niel van der Westhuizen <nielkie@gmail.com>
* Copyright (c) 2002 A'rpi
* Copyright (c) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
*
* 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
* Super 2xSaI video filter
* Ported from MPlayer libmpcodecs/vf_2xsai.c.
*/
#include "libavutil/pixdesc.h"
#include "libavutil/intreadwrite.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct Super2xSaIContext {
/* masks used for two pixels interpolation */
uint32_t hi_pixel_mask;
uint32_t lo_pixel_mask;
/* masks used for four pixels interpolation */
uint32_t q_hi_pixel_mask;
uint32_t q_lo_pixel_mask;
int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel
int is_be;
} Super2xSaIContext;
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))
#define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))
#define Q_INTERPOLATE(A, B, C, D) ((A & q_hi_pixel_mask) >> 2) + ((B & q_hi_pixel_mask) >> 2) + ((C & q_hi_pixel_mask) >> 2) + ((D & q_hi_pixel_mask) >> 2) \
+ ((((A & q_lo_pixel_mask) + (B & q_lo_pixel_mask) + (C & q_lo_pixel_mask) + (D & q_lo_pixel_mask)) >> 2) & q_lo_pixel_mask)
static int super2xsai(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
Super2xSaIContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *in = td->in;
AVFrame *out = td->out;
const uint8_t *src = in->data[0];
uint8_t *dst = out->data[0];
const int src_linesize = in->linesize[0];
const int dst_linesize = out->linesize[0];
const int width = in->width;
const int height = in->height;
unsigned int x, y;
uint32_t color[4][4];
const uint8_t *src_line[4];
const int bpp = s->bpp;
const uint32_t hi_pixel_mask = s->hi_pixel_mask;
const uint32_t lo_pixel_mask = s->lo_pixel_mask;
const uint32_t q_hi_pixel_mask = s->q_hi_pixel_mask;
const uint32_t q_lo_pixel_mask = s->q_lo_pixel_mask;
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr+1)) / nb_jobs;
/* Point to the first 4 lines, first line is duplicated */
src_line[0] = src + src_linesize*FFMAX(slice_start - 1, 0);
src_line[1] = src + src_linesize*slice_start;
src_line[2] = src + src_linesize*FFMIN(slice_start + 1, height-1);
src_line[3] = src + src_linesize*FFMIN(slice_start + 2, height-1);
#define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)
#define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)
#define READ_COLOR2(dst, src_line, off) dst = s->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)
for (y = slice_start; y < slice_end; y++) {
uint8_t *dst_line[2];
dst_line[0] = dst + dst_linesize*2*y;
dst_line[1] = dst + dst_linesize*(2*y+1);
switch (bpp) {
case 4:
READ_COLOR4(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR4(color[0][2], src_line[0], 1); READ_COLOR4(color[0][3], src_line[0], 2);
READ_COLOR4(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR4(color[1][2], src_line[1], 1); READ_COLOR4(color[1][3], src_line[1], 2);
READ_COLOR4(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR4(color[2][2], src_line[2], 1); READ_COLOR4(color[2][3], src_line[2], 2);
READ_COLOR4(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR4(color[3][2], src_line[3], 1); READ_COLOR4(color[3][3], src_line[3], 2);
break;
case 3:
READ_COLOR3(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR3(color[0][2], src_line[0], 1); READ_COLOR3(color[0][3], src_line[0], 2);
READ_COLOR3(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR3(color[1][2], src_line[1], 1); READ_COLOR3(color[1][3], src_line[1], 2);
READ_COLOR3(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR3(color[2][2], src_line[2], 1); READ_COLOR3(color[2][3], src_line[2], 2);
READ_COLOR3(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR3(color[3][2], src_line[3], 1); READ_COLOR3(color[3][3], src_line[3], 2);
break;
default:
READ_COLOR2(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR2(color[0][2], src_line[0], 1); READ_COLOR2(color[0][3], src_line[0], 2);
READ_COLOR2(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR2(color[1][2], src_line[1], 1); READ_COLOR2(color[1][3], src_line[1], 2);
READ_COLOR2(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR2(color[2][2], src_line[2], 1); READ_COLOR2(color[2][3], src_line[2], 2);
READ_COLOR2(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR2(color[3][2], src_line[3], 1); READ_COLOR2(color[3][3], src_line[3], 2);
}
for (x = 0; x < width; x++) {
uint32_t product1a, product1b, product2a, product2b;
//--------------------------------------- B0 B1 B2 B3 0 1 2 3
// 4 5* 6 S2 -> 4 5* 6 7
// 1 2 3 S1 8 9 10 11
// A0 A1 A2 A3 12 13 14 15
//--------------------------------------
if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {
product2b = color[2][1];
product1b = product2b;
} else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {
product2b = color[1][1];
product1b = product2b;
} else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {
int r = 0;
r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);
r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);
r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);
r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);
if (r > 0)
product1b = color[1][2];
else if (r < 0)
product1b = color[1][1];
else
product1b = INTERPOLATE(color[1][1], color[1][2]);
product2b = product1b;
} else {
if (color[1][2] == color[2][2] && color[2][2] == color[3][1] && color[2][1] != color[3][2] && color[2][2] != color[3][0])
product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);
else if (color[1][1] == color[2][1] && color[2][1] == color[3][2] && color[3][1] != color[2][2] && color[2][1] != color[3][3])
product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);
else
product2b = INTERPOLATE(color[2][1], color[2][2]);
if (color[1][2] == color[2][2] && color[1][2] == color[0][1] && color[1][1] != color[0][2] && color[1][2] != color[0][0])
product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);
else if (color[1][1] == color[2][1] && color[1][1] == color[0][2] && color[0][1] != color[1][2] && color[1][1] != color[0][3])
product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);
else
product1b = INTERPOLATE(color[1][1], color[1][2]);
}
if (color[1][1] == color[2][2] && color[2][1] != color[1][2] && color[1][0] == color[1][1] && color[1][1] != color[3][2])
product2a = INTERPOLATE(color[2][1], color[1][1]);
else if (color[1][1] == color[2][0] && color[1][2] == color[1][1] && color[1][0] != color[2][1] && color[1][1] != color[3][0])
product2a = INTERPOLATE(color[2][1], color[1][1]);
else
product2a = color[2][1];
if (color[2][1] == color[1][2] && color[1][1] != color[2][2] && color[2][0] == color[2][1] && color[2][1] != color[0][2])
product1a = INTERPOLATE(color[2][1], color[1][1]);
else if (color[1][0] == color[2][1] && color[2][2] == color[2][1] && color[2][0] != color[1][1] && color[2][1] != color[0][0])
product1a = INTERPOLATE(color[2][1], color[1][1]);
else
product1a = color[1][1];
/* Set the calculated pixels */
switch (bpp) {
case 4:
AV_WN32A(dst_line[0] + x * 8, product1a);
AV_WN32A(dst_line[0] + x * 8 + 4, product1b);
AV_WN32A(dst_line[1] + x * 8, product2a);
AV_WN32A(dst_line[1] + x * 8 + 4, product2b);
break;
case 3:
AV_WL24(dst_line[0] + x * 6, product1a);
AV_WL24(dst_line[0] + x * 6 + 3, product1b);
AV_WL24(dst_line[1] + x * 6, product2a);
AV_WL24(dst_line[1] + x * 6 + 3, product2b);
break;
default: // bpp = 2
if (s->is_be) {
AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));
AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));
} else {
AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));
AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));
}
}
/* Move color matrix forward */
color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];
color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];
color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];
color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];
if (x < width - 3) {
x += 3;
switch (bpp) {
case 4:
READ_COLOR4(color[0][3], src_line[0], x);
READ_COLOR4(color[1][3], src_line[1], x);
READ_COLOR4(color[2][3], src_line[2], x);
READ_COLOR4(color[3][3], src_line[3], x);
break;
case 3:
READ_COLOR3(color[0][3], src_line[0], x);
READ_COLOR3(color[1][3], src_line[1], x);
READ_COLOR3(color[2][3], src_line[2], x);
READ_COLOR3(color[3][3], src_line[3], x);
break;
default: /* case 2 */
READ_COLOR2(color[0][3], src_line[0], x);
READ_COLOR2(color[1][3], src_line[1], x);
READ_COLOR2(color[2][3], src_line[2], x);
READ_COLOR2(color[3][3], src_line[3], x);
}
x -= 3;
}
}
/* We're done with one line, so we shift the source lines up */
src_line[0] = src_line[1];
src_line[1] = src_line[2];
src_line[2] = src_line[3];
/* Read next line */
src_line[3] = src_line[2];
if (y < height - 3)
src_line[3] += src_linesize;
} // y loop
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGB565BE, AV_PIX_FMT_BGR565BE, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_BGR555BE,
AV_PIX_FMT_RGB565LE, AV_PIX_FMT_BGR565LE, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_BGR555LE,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int config_input(AVFilterLink *inlink)
{
Super2xSaIContext *s = inlink->dst->priv;
s->hi_pixel_mask = 0xFEFEFEFE;
s->lo_pixel_mask = 0x01010101;
s->q_hi_pixel_mask = 0xFCFCFCFC;
s->q_lo_pixel_mask = 0x03030303;
s->bpp = 4;
switch (inlink->format) {
case AV_PIX_FMT_RGB24:
case AV_PIX_FMT_BGR24:
s->bpp = 3;
break;
case AV_PIX_FMT_RGB565BE:
case AV_PIX_FMT_BGR565BE:
s->is_be = 1;
case AV_PIX_FMT_RGB565LE:
case AV_PIX_FMT_BGR565LE:
s->hi_pixel_mask = 0xF7DEF7DE;
s->lo_pixel_mask = 0x08210821;
s->q_hi_pixel_mask = 0xE79CE79C;
s->q_lo_pixel_mask = 0x18631863;
s->bpp = 2;
break;
case AV_PIX_FMT_BGR555BE:
case AV_PIX_FMT_RGB555BE:
s->is_be = 1;
case AV_PIX_FMT_BGR555LE:
case AV_PIX_FMT_RGB555LE:
s->hi_pixel_mask = 0x7BDE7BDE;
s->lo_pixel_mask = 0x04210421;
s->q_hi_pixel_mask = 0x739C739C;
s->q_lo_pixel_mask = 0x0C630C63;
s->bpp = 2;
break;
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterLink *inlink = outlink->src->inputs[0];
outlink->w = inlink->w*2;
outlink->h = inlink->h*2;
av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",
av_get_pix_fmt_name(inlink->format),
inlink->w, inlink->h, outlink->w, outlink->h);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *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);
out->width = outlink->w;
out->height = outlink->h;
td.in = in, td.out = out;
ff_filter_execute(ctx, super2xsai, &td, NULL,
FFMIN(in->height, ff_filter_get_nb_threads(ctx)));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad super2xsai_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad super2xsai_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_super2xsai = {
.name = "super2xsai",
.description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
.priv_size = sizeof(Super2xSaIContext),
FILTER_INPUTS(super2xsai_inputs),
FILTER_OUTPUTS(super2xsai_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SLICE_THREADS,
};
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