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/*
* Copyright (c) 2021 Paul B Mahol
*
* 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 "config_components.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "video.h"
typedef struct LatencyContext {
int64_t min_latency;
int64_t max_latency;
int64_t sum;
} LatencyContext;
static av_cold int init(AVFilterContext *ctx)
{
LatencyContext *s = ctx->priv;
s->min_latency = INT64_MAX;
s->max_latency = INT64_MIN;
return 0;
}
static int activate(AVFilterContext *ctx)
{
LatencyContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
FilterLink *inl = ff_filter_link(inlink);
AVFilterLink *outlink = ctx->outputs[0];
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (!ctx->is_disabled && ctx->inputs[0]->src &&
ctx->inputs[0]->src->nb_inputs > 0) {
AVFilterLink *prevlink = ctx->inputs[0]->src->inputs[0];
FilterLink *prevl = ff_filter_link(prevlink);
int64_t delta = 0;
switch (prevlink->type) {
case AVMEDIA_TYPE_AUDIO:
delta = prevl->sample_count_in - inl->sample_count_out;
break;
case AVMEDIA_TYPE_VIDEO:
delta = prevl->frame_count_in - inl->frame_count_out;
break;
}
if (delta > 0) {
s->min_latency = FFMIN(s->min_latency, delta);
s->max_latency = FFMAX(s->max_latency, delta);
}
}
if (ff_inlink_queued_frames(inlink)) {
AVFrame *frame = NULL;
int ret;
ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return ff_filter_frame(outlink, frame);
}
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static av_cold void uninit(AVFilterContext *ctx)
{
LatencyContext *s = ctx->priv;
if (s->min_latency != INT64_MAX)
av_log(ctx, AV_LOG_INFO, "Min latency: %"PRId64"\n", s->min_latency);
if (s->max_latency != INT64_MIN)
av_log(ctx, AV_LOG_INFO, "Max latency: %"PRId64"\n", s->max_latency);
}
#if CONFIG_LATENCY_FILTER
const AVFilter ff_vf_latency = {
.name = "latency",
.description = NULL_IF_CONFIG_SMALL("Report video filtering latency."),
.priv_size = sizeof(LatencyContext),
.init = init,
.uninit = uninit,
.activate = activate,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(ff_video_default_filterpad),
FILTER_OUTPUTS(ff_video_default_filterpad),
};
#endif // CONFIG_LATENCY_FILTER
#if CONFIG_ALATENCY_FILTER
const AVFilter ff_af_alatency = {
.name = "alatency",
.description = NULL_IF_CONFIG_SMALL("Report audio filtering latency."),
.priv_size = sizeof(LatencyContext),
.init = init,
.uninit = uninit,
.activate = activate,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
FILTER_INPUTS(ff_audio_default_filterpad),
FILTER_OUTPUTS(ff_audio_default_filterpad),
};
#endif // CONFIG_ALATENCY_FILTER
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