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/*****************************************************************
* gmerlin - a general purpose multimedia framework and applications
*
* Copyright (c) 2001 - 2024 Members of the Gmerlin project
* http://github.com/bplaum
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <gavl/gavl.h>
#include <gmerlin/frametimer.h>
#define TIME_SCALE 1000
struct bg_frame_timer_s
{
int frame_duration;
gavl_timer_t * timer;
int64_t next_pts;
/* Only used when bg_frame_timer_wait() is used */
gavl_time_t capture_start_time;
gavl_time_t last_capture_duration;
gavl_time_t last_time;
};
bg_frame_timer_t * bg_frame_timer_create(float framerate,
uint32_t * timescale)
{
bg_frame_timer_t * ret;
ret = calloc(1, sizeof(*ret));
ret->timer = gavl_timer_create();
ret->next_pts = GAVL_TIME_UNDEFINED;
ret->frame_duration = (int)(TIME_SCALE / framerate);
*timescale = TIME_SCALE;
return ret;
}
void bg_frame_timer_destroy(bg_frame_timer_t * t)
{
gavl_timer_destroy(t->timer);
free(t);
}
void bg_frame_timer_update(bg_frame_timer_t * t,
gavl_video_frame_t * frame)
{
int64_t diff;
gavl_time_t current_time;
int64_t real_duration;
current_time = gavl_timer_get(t->timer);
t->last_capture_duration = current_time - t->capture_start_time;
if(t->next_pts == GAVL_TIME_UNDEFINED)
{
frame->timestamp = 0;
frame->duration = t->frame_duration;
gavl_timer_start(t->timer);
t->next_pts = frame->duration;
t->last_time = 0;
return;
}
frame->timestamp = t->next_pts;
/*
* diff: True time minus guessed time
*
* Diff < 0 -> frame too early: Guessed duration was too large
* Diff > 0 -> frame too late: Guessed duration was too small
*/
diff = gavl_time_scale(TIME_SCALE, current_time) - t->next_pts;
/* Real duration of the last frame */
real_duration =
gavl_time_scale(TIME_SCALE, current_time - t->last_time);
/* Duration of this frame is real duration of the last frame
plus the error */
frame->duration = real_duration + diff;
// fprintf(stderr, "Cur: %"PRId64", Last: %"PRId64", diff: %"PRId64"\n",
// current_time, t->last_time, current_time - t->last_time);
if(frame->duration <= 0)
frame->duration = TIME_SCALE / 100; // 10 ms/100 fps
t->last_time = current_time;
t->next_pts += frame->duration;
}
void bg_frame_timer_wait(bg_frame_timer_t * t)
{
gavl_time_t cur, diff;
if(t->next_pts == GAVL_TIME_UNDEFINED)
return;
cur = gavl_timer_get(t->timer);
diff =
gavl_time_unscale(TIME_SCALE, t->frame_duration) - (cur - t->last_time) -
t->last_capture_duration;
if(diff > 0)
gavl_time_delay(&diff);
t->capture_start_time = gavl_timer_get(t->timer);
}
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