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/*
* Copyright (c) 2015 Nicolas George
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "avfilter.h"
#include "internal.h"
#include <float.h>
typedef struct RealtimeContext {
const AVClass *class;
int64_t delta;
int64_t limit;
double speed;
unsigned inited;
} RealtimeContext;
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
RealtimeContext *s = ctx->priv;
if (frame->pts != AV_NOPTS_VALUE) {
int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q) / s->speed;
int64_t now = av_gettime_relative();
int64_t sleep = pts - now + s->delta;
if (!s->inited) {
s->inited = 1;
sleep = 0;
s->delta = now - pts;
}
if (FFABS(sleep) > s->limit / s->speed) {
av_log(ctx, AV_LOG_WARNING,
"time discontinuity detected: %"PRIi64" us, resetting\n",
sleep);
sleep = 0;
s->delta = now - pts;
}
if (sleep > 0) {
av_log(ctx, AV_LOG_DEBUG, "sleeping %"PRIi64" us\n", sleep);
for (; sleep > 600000000; sleep -= 600000000)
av_usleep(600000000);
av_usleep(sleep);
}
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(RealtimeContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const AVOption options[] = {
{ "limit", "sleep time limit", OFFSET(limit), AV_OPT_TYPE_DURATION, { .i64 = 2000000 }, 0, INT64_MAX, FLAGS },
{ "speed", "speed factor", OFFSET(speed), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, DBL_MIN, DBL_MAX, FLAGS },
{ NULL }
};
#if CONFIG_REALTIME_FILTER
#define realtime_options options
AVFILTER_DEFINE_CLASS(realtime);
static const AVFilterPad avfilter_vf_realtime_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_realtime_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_realtime = {
.name = "realtime",
.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
.priv_size = sizeof(RealtimeContext),
.priv_class = &realtime_class,
.inputs = avfilter_vf_realtime_inputs,
.outputs = avfilter_vf_realtime_outputs,
};
#endif /* CONFIG_REALTIME_FILTER */
#if CONFIG_AREALTIME_FILTER
#define arealtime_options options
AVFILTER_DEFINE_CLASS(arealtime);
static const AVFilterPad arealtime_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad arealtime_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
AVFilter ff_af_arealtime = {
.name = "arealtime",
.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
.priv_size = sizeof(RealtimeContext),
.priv_class = &arealtime_class,
.inputs = arealtime_inputs,
.outputs = arealtime_outputs,
};
#endif /* CONFIG_AREALTIME_FILTER */
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