mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2026-11-06 13:28:17 +00:00
Michael Niedermayer
58892c922e
These filters never access pixel data based on the size or format of their input link, so frames that change size or format after the graph was configured pass through them unharmed. Marking them keeps the common -reinit_filter 0 chains working. Found during triage of the security report RqgTntCAW2qN.
124 lines
4.0 KiB
C
124 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 "config_components.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "video.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 | AV_OPT_FLAG_RUNTIME_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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const FFFilter ff_vf_realtime = {
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.p.name = "realtime",
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.p.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
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.p.priv_class = &realtime_class,
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.p.flags = AVFILTER_FLAG_METADATA_ONLY,
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.priv_size = sizeof(RealtimeContext),
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FILTER_INPUTS(avfilter_vf_realtime_inputs),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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.process_command = ff_filter_process_command,
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.flags_internal = FF_FILTER_FLAG_DYNAMIC_FRAME_PARAMS,
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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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const FFFilter ff_af_arealtime = {
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.p.name = "arealtime",
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.p.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
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.p.priv_class = &realtime_class,
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.p.flags = AVFILTER_FLAG_METADATA_ONLY,
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.priv_size = sizeof(RealtimeContext),
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FILTER_INPUTS(arealtime_inputs),
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FILTER_OUTPUTS(ff_audio_default_filterpad),
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.process_command = ff_filter_process_command,
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};
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#endif /* CONFIG_AREALTIME_FILTER */
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