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58 lines
1.3 KiB
58 lines
1.3 KiB
12 months ago
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/*
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* Copyright 2024 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#include "audio/stream_cues.hpp"
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#include <cstdint>
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#include <memory>
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namespace audio {
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StreamCues::StreamCues() : now_(0) {}
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auto StreamCues::update(uint32_t sample) -> void {
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if (sample < now_) {
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// The current time must have overflowed. Deal with any cues between now_
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// and UINT32_MAX, then proceed as normal.
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while (!upcoming_.empty() && upcoming_.front().start_at > now_) {
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current_ = upcoming_.front();
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upcoming_.pop_front();
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}
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}
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now_ = sample;
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while (!upcoming_.empty() && upcoming_.front().start_at <= now_) {
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current_ = upcoming_.front();
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upcoming_.pop_front();
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}
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}
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auto StreamCues::addCue(std::shared_ptr<TrackInfo> track, uint32_t sample)
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-> void {
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upcoming_.push_back(Cue{
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.track = track,
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.start_at = sample,
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});
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}
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auto StreamCues::current() -> std::pair<std::shared_ptr<TrackInfo>, uint32_t> {
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if (!current_) {
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return {};
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}
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uint32_t duration;
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if (now_ < current_->start_at) {
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// now_ overflowed since this track started.
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duration = now_ + (UINT32_MAX - current_->start_at);
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} else {
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duration = now_ - current_->start_at;
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}
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return {current_->track, duration};
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}
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} // namespace audio
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