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/* |
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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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