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https://github.com/FFmpeg/FFmpeg.git
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b9c928a486
This flag allows distinguishing between filters that actually modify the data and those that only modify metadata or gather some stream information.
131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/*
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* Copyright (c) 2015 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser 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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "avfilter.h"
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#include "internal.h"
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#include <float.h>
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typedef struct RealtimeContext {
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const AVClass *class;
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int64_t delta;
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int64_t limit;
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double speed;
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unsigned inited;
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} RealtimeContext;
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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RealtimeContext *s = ctx->priv;
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if (frame->pts != AV_NOPTS_VALUE) {
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int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q) / s->speed;
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int64_t now = av_gettime_relative();
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int64_t sleep = pts - now + s->delta;
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if (!s->inited) {
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s->inited = 1;
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sleep = 0;
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s->delta = now - pts;
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}
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if (FFABS(sleep) > s->limit / s->speed) {
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av_log(ctx, AV_LOG_WARNING,
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"time discontinuity detected: %"PRIi64" us, resetting\n",
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sleep);
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sleep = 0;
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s->delta = now - pts;
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}
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if (sleep > 0) {
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av_log(ctx, AV_LOG_DEBUG, "sleeping %"PRIi64" us\n", sleep);
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for (; sleep > 600000000; sleep -= 600000000)
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av_usleep(600000000);
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av_usleep(sleep);
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}
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(RealtimeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption options[] = {
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{ "limit", "sleep time limit", OFFSET(limit), AV_OPT_TYPE_DURATION, { .i64 = 2000000 }, 0, INT64_MAX, FLAGS },
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{ "speed", "speed factor", OFFSET(speed), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, DBL_MIN, DBL_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS_EXT(realtime, "(a)realtime", options);
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#if CONFIG_REALTIME_FILTER
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static const AVFilterPad avfilter_vf_realtime_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad avfilter_vf_realtime_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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};
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const AVFilter ff_vf_realtime = {
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.name = "realtime",
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.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
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.priv_size = sizeof(RealtimeContext),
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.priv_class = &realtime_class,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(avfilter_vf_realtime_inputs),
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FILTER_OUTPUTS(avfilter_vf_realtime_outputs),
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};
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#endif /* CONFIG_REALTIME_FILTER */
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#if CONFIG_AREALTIME_FILTER
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static const AVFilterPad arealtime_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad arealtime_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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};
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const AVFilter ff_af_arealtime = {
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.name = "arealtime",
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.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
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.priv_class = &realtime_class,
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.priv_size = sizeof(RealtimeContext),
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(arealtime_inputs),
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FILTER_OUTPUTS(arealtime_outputs),
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};
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#endif /* CONFIG_AREALTIME_FILTER */
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