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/*
* based on video_out_null.c from mpeg2dec
*
* Copyright (C) Aaron Holtzman - June 2000
*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include "common/msg.h"
#include "vo.h"
#include "video/mp_image.h"
#include "osdep/timer.h"
#include "options/m_option.h"
struct priv {
int64_t last_vsync;
double cfg_fps;
};
static void draw_image(struct vo *vo, mp_image_t *mpi)
{
talloc_free(mpi);
}
static void flip_page(struct vo *vo)
{
struct priv *p = vo->priv;
if (p->cfg_fps) {
int64_t ft = 1e6 / p->cfg_fps;
int64_t prev_vsync = mp_time_us() / ft;
int64_t target_time = (prev_vsync + 1) * ft;
for (;;) {
int64_t now = mp_time_us();
if (now >= target_time)
break;
mp_sleep_us(target_time - now);
}
}
}
static int query_format(struct vo *vo, int format)
{
return 1;
}
static int reconfig(struct vo *vo, struct mp_image_params *params)
{
return 0;
}
static void uninit(struct vo *vo)
{
}
static int preinit(struct vo *vo)
{
return 0;
}
static int control(struct vo *vo, uint32_t request, void *data)
{
struct priv *p = vo->priv;
switch (request) {
case VOCTRL_GET_DISPLAY_FPS:
if (!p->cfg_fps)
break;
*(double *)data = p->cfg_fps;
return VO_TRUE;
}
return VO_NOTIMPL;
}
#define OPT_BASE_STRUCT struct priv
const struct vo_driver video_out_null = {
.description = "Null video output",
.name = "null",
.preinit = preinit,
.query_format = query_format,
.reconfig = reconfig,
.control = control,
.draw_image = draw_image,
.flip_page = flip_page,
.uninit = uninit,
.priv_size = sizeof(struct priv),
.options = (const struct m_option[]) {
OPT_DOUBLE("fps", cfg_fps, M_OPT_RANGE, .min = 0, .max = 10000),
{0},
},
.options_prefix = "vo-null",
};
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