mirror of
https://github.com/mpv-player/mpv
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105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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* Copyright (c) 2012 Rudolf Polzer <divVerent@xonotic.org>
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*
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* This file is part of mpv's vf_dlopen examples.
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*
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* mpv's vf_dlopen examples are free software; you can redistribute them and/or
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* modify them under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* License, or (at your option) any later version.
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*
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* mpv's vf_dlopen examples are distributed in the hope that they will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv's vf_dlopen examples; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "vf_dlopen.h"
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#include "filterutils.h"
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#define MIN(a,b) ((a)<(b)?(a):(b))
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/*
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* frame stepping filter
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*
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* usage: -vf dlopen=./framestep.so:5
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*
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* outputs every 5th frame
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*
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* usage: -vf dlopen=./framestep.so:5:3
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*
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* outputs every 5th frame, starting with frame index 3 (default: 0)
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*/
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typedef struct {
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int step, pos;
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} framestep_data_t;
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static int framestep_put_image(struct vf_dlopen_context *ctx)
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{
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framestep_data_t *framestep = ctx->priv;
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// stepping
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if (framestep->pos < 0)
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return 0;
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--framestep->pos;
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if (framestep->pos >= 0)
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return 0;
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framestep->pos += framestep->step;
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// copying
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assert(ctx->inpic.planes == ctx->outpic[0].planes);
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int np = ctx->inpic.planes;
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int p;
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for (p = 0; p < np; ++p) {
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assert(ctx->inpic.planewidth[p] == ctx->outpic->planewidth[p]);
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assert(ctx->inpic.planeheight[p] == ctx->outpic->planeheight[p]);
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copy_plane(
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ctx->outpic->plane[p],
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ctx->outpic->planestride[p],
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ctx->inpic.plane[p],
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ctx->inpic.planestride[p],
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MIN(ctx->inpic.planestride[p], ctx->outpic->planestride[p]),
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ctx->inpic.planeheight[p]
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);
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}
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ctx->outpic->pts = ctx->inpic.pts;
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return 1;
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}
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void framestep_uninit(struct vf_dlopen_context *ctx)
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{
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free(ctx->priv);
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}
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int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
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{
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VF_DLOPEN_CHECK_VERSION(ctx);
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if (argc != 1 && argc != 2)
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return -1;
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framestep_data_t *framestep = malloc(sizeof(framestep_data_t));
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memset(framestep, 0, sizeof(*framestep));
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framestep->step = atoi(argv[0]);
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framestep->pos = (argc >= 2) ? atoi(argv[1]) : 0;
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ctx->priv = framestep;
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ctx->put_image = framestep_put_image;
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ctx->uninit = framestep_uninit;
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return 1;
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}
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