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ffmpeg/libavfilter/vf_super2xsai.c
Stefano Sabatini b2bcbcd999 lavfi/super2xsai: simplify code updating the color matrix at each y iteration 
Remove duplicated out-of-loop init code, and do color matrix
initialization at the beginning of each y iteration.

Allow factorization and avoid an useless matrix update in the last
iteration.
2012-06-16 00:30:48 +02:00

330 lines
14 KiB
C
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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"
typedef struct {
/* 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
} Super2xSaIContext;
#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 void super2xsai(AVFilterContext *ctx,
uint8_t *src, int src_linesize,
uint8_t *dst, int dst_linesize,
int width, int height)
{
Super2xSaIContext *sai = ctx->priv;
unsigned int x, y;
uint32_t color[4][4];
unsigned char *src_line[4];
const int bpp = sai->bpp;
const uint32_t hi_pixel_mask = sai->hi_pixel_mask;
const uint32_t lo_pixel_mask = sai->lo_pixel_mask;
const uint32_t q_hi_pixel_mask = sai->q_hi_pixel_mask;
const uint32_t q_lo_pixel_mask = sai->q_lo_pixel_mask;
/* Point to the first 4 lines, first line is duplicated */
src_line[0] = src;
src_line[1] = src;
src_line[2] = src + src_linesize*FFMIN(1, height-1);
src_line[3] = src + src_linesize*FFMIN(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 = *((const uint16_t *)src_line + off)
for (y = 0; y < height; 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
AV_WN32A(dst_line[0] + x * 4, product1a | (product1b << 16));
AV_WN32A(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
}
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_RGBA, PIX_FMT_BGRA, PIX_FMT_ARGB, PIX_FMT_ABGR,
PIX_FMT_RGB24, PIX_FMT_BGR24,
PIX_FMT_RGB565, PIX_FMT_BGR565, PIX_FMT_RGB555, PIX_FMT_BGR555,
PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static int config_input(AVFilterLink *inlink)
{
Super2xSaIContext *sai = inlink->dst->priv;
sai->hi_pixel_mask = 0xFEFEFEFE;
sai->lo_pixel_mask = 0x01010101;
sai->q_hi_pixel_mask = 0xFCFCFCFC;
sai->q_lo_pixel_mask = 0x03030303;
sai->bpp = 4;
switch (inlink->format) {
case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
sai->bpp = 3;
break;
case PIX_FMT_RGB565:
case PIX_FMT_BGR565:
sai->hi_pixel_mask = 0xF7DEF7DE;
sai->lo_pixel_mask = 0x08210821;
sai->q_hi_pixel_mask = 0xE79CE79C;
sai->q_lo_pixel_mask = 0x18631863;
sai->bpp = 2;
break;
case PIX_FMT_BGR555:
case PIX_FMT_RGB555:
sai->hi_pixel_mask = 0x7BDE7BDE;
sai->lo_pixel_mask = 0x04210421;
sai->q_hi_pixel_mask = 0x739C739C;
sai->q_lo_pixel_mask = 0x0C630C63;
sai->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_INFO, "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 void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
static void end_frame(AVFilterLink *inlink)
{
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *inpicref = inlink->cur_buf;
AVFilterBufferRef *outpicref = outlink->out_buf;
super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0],
outpicref->data[0], outpicref->linesize[0],
inlink->w, inlink->h);
avfilter_unref_buffer(inpicref);
avfilter_draw_slice(outlink, 0, outlink->h, 1);
avfilter_end_frame(outlink);
avfilter_unref_buffer(outpicref);
}
AVFilter avfilter_vf_super2xsai = {
.name = "super2xsai",
.description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
.priv_size = sizeof(Super2xSaIContext),
.query_formats = query_formats,
.inputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.draw_slice = null_draw_slice,
.end_frame = end_frame,
.min_perms = AV_PERM_READ },
{ .name = NULL }
},
.outputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output },
{ .name = NULL }
},
};
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