2 * Copyright (c) 2018 Marton Balint
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavutil/opt.h"
22 #include "libavutil/time.h"
27 typedef struct CueContext {
36 static int activate(AVFilterContext *ctx)
38 AVFilterLink *inlink = ctx->inputs[0];
39 AVFilterLink *outlink = ctx->outputs[0];
40 CueContext *s = ctx->priv;
42 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
44 if (ff_inlink_queued_frames(inlink)) {
45 AVFrame *frame = ff_inlink_peek_frame(inlink, 0);
46 int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
53 if (pts - s->first_pts < s->preroll) {
54 ff_inlink_consume_frame(inlink, &frame);
55 return ff_filter_frame(outlink, frame);
61 frame = ff_inlink_peek_frame(inlink, ff_inlink_queued_frames(inlink) - 1);
62 pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
63 if (!(pts - s->first_pts < s->buffer && (av_gettime() - s->cue) < 0))
68 while ((diff = (av_gettime() - s->cue)) < 0)
69 av_usleep(av_clip(-diff / 2, 100, 1000000));
73 ff_inlink_consume_frame(inlink, &frame);
74 return ff_filter_frame(outlink, frame);
78 FF_FILTER_FORWARD_STATUS(inlink, outlink);
79 FF_FILTER_FORWARD_WANTED(outlink, inlink);
81 return FFERROR_NOT_READY;
84 #define OFFSET(x) offsetof(CueContext, x)
85 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
86 static const AVOption options[] = {
87 { "cue", "cue unix timestamp in microseconds", OFFSET(cue), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
88 { "preroll", "preroll duration in seconds", OFFSET(preroll), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
89 { "buffer", "buffer duration in seconds", OFFSET(buffer), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
94 #define cue_options options
95 AVFILTER_DEFINE_CLASS(cue);
97 static const AVFilterPad cue_inputs[] = {
100 .type = AVMEDIA_TYPE_VIDEO,
105 static const AVFilterPad cue_outputs[] = {
108 .type = AVMEDIA_TYPE_VIDEO,
113 AVFilter ff_vf_cue = {
115 .description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
116 .priv_size = sizeof(CueContext),
117 .priv_class = &cue_class,
118 .inputs = cue_inputs,
119 .outputs = cue_outputs,
120 .activate = activate,
122 #endif /* CONFIG_CUE_FILTER */
124 #if CONFIG_ACUE_FILTER
125 #define acue_options options
126 AVFILTER_DEFINE_CLASS(acue);
128 static const AVFilterPad acue_inputs[] = {
131 .type = AVMEDIA_TYPE_AUDIO,
136 static const AVFilterPad acue_outputs[] = {
139 .type = AVMEDIA_TYPE_AUDIO,
144 AVFilter ff_af_acue = {
146 .description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
147 .priv_size = sizeof(CueContext),
148 .priv_class = &acue_class,
149 .inputs = acue_inputs,
150 .outputs = acue_outputs,
151 .activate = activate,
153 #endif /* CONFIG_ACUE_FILTER */