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2f62a433f2
Lots of video filters use a very simple input or output: An array with a single AVFilterPad whose name is "default" and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset. Given that we never use pointer equality for inputs or outputs*, we can simply use a single AVFilterPad instead of dozens; this even saves .data.rel.ro (8312B here) as well as relocations. *: In fact, several filters (like the filters in vf_lut.c) already use the same outputs; furthermore, ff_filter_alloc() duplicates the input and output pads so that we do not even work with the pads directly. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*
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* Copyright (c) 2018 Marton Balint
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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 "internal.h"
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#include "video.h"
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typedef struct CueContext {
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const AVClass *class;
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int64_t first_pts;
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int64_t cue;
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int64_t preroll;
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int64_t buffer;
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int status;
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} CueContext;
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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CueContext *s = ctx->priv;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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if (ff_inlink_queued_frames(inlink)) {
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AVFrame *frame = ff_inlink_peek_frame(inlink, 0);
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int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
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if (!s->status) {
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s->first_pts = pts;
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s->status++;
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}
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if (s->status == 1) {
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if (pts - s->first_pts < s->preroll) {
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int ret = ff_inlink_consume_frame(inlink, &frame);
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if (ret < 0)
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return ret;
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return ff_filter_frame(outlink, frame);
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}
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s->first_pts = pts;
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s->status++;
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}
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if (s->status == 2) {
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frame = ff_inlink_peek_frame(inlink, ff_inlink_queued_frames(inlink) - 1);
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pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
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if (!(pts - s->first_pts < s->buffer && (av_gettime() - s->cue) < 0))
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s->status++;
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}
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if (s->status == 3) {
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int64_t diff;
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while ((diff = (av_gettime() - s->cue)) < 0)
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av_usleep(av_clip(-diff / 2, 100, 1000000));
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s->status++;
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}
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if (s->status == 4) {
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int ret = ff_inlink_consume_frame(inlink, &frame);
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if (ret < 0)
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return ret;
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return ff_filter_frame(outlink, frame);
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}
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}
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FF_FILTER_FORWARD_STATUS(inlink, outlink);
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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#define OFFSET(x) offsetof(CueContext, 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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{ "cue", "cue unix timestamp in microseconds", OFFSET(cue), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
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{ "preroll", "preroll duration in seconds", OFFSET(preroll), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
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{ "buffer", "buffer duration in seconds", OFFSET(buffer), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS_EXT(cue_acue, "(a)cue", options);
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#if CONFIG_CUE_FILTER
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const AVFilter ff_vf_cue = {
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.name = "cue",
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.description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
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.priv_class = &cue_acue_class,
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.priv_size = sizeof(CueContext),
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FILTER_INPUTS(ff_video_default_filterpad),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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.activate = activate,
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};
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#endif /* CONFIG_CUE_FILTER */
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#if CONFIG_ACUE_FILTER
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const AVFilter ff_af_acue = {
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.name = "acue",
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.description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
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.priv_class = &cue_acue_class,
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.priv_size = sizeof(CueContext),
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(ff_audio_default_filterpad),
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FILTER_OUTPUTS(ff_audio_default_filterpad),
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.activate = activate,
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};
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#endif /* CONFIG_ACUE_FILTER */
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