mpv/TOOLS/vf_dlopen/showqscale.c

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/*
* Copyright (c) 2012 Rudolf Polzer <divVerent@xonotic.org>
*
* This file is part of mpv's vf_dlopen examples.
*
* mpv's vf_dlopen examples are free software; you can redistribute them and/or
* modify them 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.
*
* mpv's vf_dlopen examples are distributed in the hope that they 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 mpv's vf_dlopen examples; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vf_dlopen.h"
/*
* qscale visualizer
*
* usage: -vf dlopen=./showqscale.so
*
* uses reddish colors for high QPs, and greenish colors for low QPs
*/
#define PLANE_Y 0
#define PLANE_U 1
#define PLANE_V 2
static int qs_put_image(struct vf_dlopen_context *ctx)
{
unsigned int x, y, p;
assert(ctx->inpic.planes == ctx->outpic[0].planes);
for (p = 0; p < ctx->outpic[0].planes; ++p) {
assert(ctx->inpic.planewidth[p] == ctx->outpic[0].planewidth[p]);
assert(ctx->inpic.planeheight[p] == ctx->outpic[0].planeheight[p]);
if ((p == PLANE_U || p == PLANE_V) && ctx->inpic_qscale)
continue;
#if 0
// copy as is
for (y = 0; y < ctx->outpic[0].planeheight[p]; ++y)
memcpy(
&ctx->outpic[0].plane[p][ctx->outpic[0].planestride[p] * y],
&inpic[ctx->outpic[0].planeofs[p] + ctx->inpic.planestride[p] * y],
ctx->outpic[0].planewidth[p]
);
#else
// reduce contrast
for (y = 0; y < ctx->outpic[0].planeheight[p]; ++y)
for (x = 0; x < ctx->outpic[0].planewidth[p]; ++x)
ctx->outpic[0].plane[p][ctx->outpic[0].planestride[p] * y + x] =
0x20 + ((ctx->inpic.plane[p][ctx->inpic.planestride[p] * y + x] * 3) >> 2);
#endif
}
if (ctx->inpic_qscale) {
int qmin = 255;
int qmax = -255;
// clear U plane
p = PLANE_U;
for (y = 0; y < ctx->outpic[0].planeheight[p]; ++y)
memset(
&ctx->outpic[0].plane[p][ctx->outpic[0].planestride[p] * y],
0x80,
ctx->outpic[0].planewidth[p]
);
// replace V by the qp (0 = green, 12 = red)
p = PLANE_V;
for (y = 0; y < ctx->outpic[0].planeheight[p]; ++y)
for (x = 0; x < ctx->outpic[0].planewidth[p]; ++x) {
int q = ctx->inpic_qscale[
(x >> (ctx->inpic_qscaleshift - ctx->inpic.planexshift[p])) +
(y >> (ctx->inpic_qscaleshift - ctx->inpic.planeyshift[p])) * ctx->inpic_qscalestride];
if (q < qmin)
qmin = q;
if (q > qmax)
qmax = q;
int v = 128 + 21 * (q - 6); // range: 0 = green, 12 = red
if (v < 0)
v = 0;
if (v > 255)
v = 255;
ctx->outpic[0].plane[p][ctx->outpic[0].planestride[p] * y + x] = v;
}
// printf("qscale range: %d .. %d\n", qmin, qmax);
}
ctx->outpic[0].pts = ctx->inpic.pts;
return 1;
}
int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
{
VF_DLOPEN_CHECK_VERSION(ctx);
(void) argc;
(void) argv;
static struct vf_dlopen_formatpair map[] = {
{ "yv12", "yv12" },
{ NULL, NULL }
};
ctx->format_mapping = map;
ctx->put_image = qs_put_image;
return 1;
}