mrleo1nidandClaude Opus 5.5
c05e523cbe
- tracks carry a stream_url signed for the user for 12 h and the user's reaction; /stream checks the signature, expiry and that the user is not blocked, then hands the file to nginx by X-Accel-Redirect (or serves it with Range support when X_ACCEL=false) - original by default; formats browsers can't play and explicit high/medium/low go through Opus transcoding, never upwards: a lossy source under the target bitrate stays original; transcodes are cached per file and size, deduplicated in flight, limited by TRANSCODE_CONCURRENCY and trimmed hourly by LRU to the size limit - /events takes up to 500 events with client UUIDs, drops repeats and events older than 30 days, counts plays (≥ half or 4 min, or finished), early skips and history entries (≥ 30 s) - history with clearing, likes and dislikes with cursors and totals, track reactions, playback state with last-write-wins, tracks batch Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
80 lines
2.9 KiB
Go
80 lines
2.9 KiB
Go
// Package playback — стриминг, транскодинг, события прослушивания, история, реакции и
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// состояние плеера (docs/playback.md).
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package playback
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// Качество стрима.
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const (
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QualityAuto = "auto"
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QualityOriginal = "original"
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QualityHigh = "high"
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QualityMedium = "medium"
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QualityLow = "low"
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)
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// Целевой битрейт Opus, кбит/с.
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var opusKbps = map[string]int{QualityHigh: 256, QualityMedium: 128, QualityLow: 64}
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// Форматы, которые браузеры не играют: их всегда отдаём транскодом.
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var browserUnplayable = map[string]bool{"ape": true, "wv": true, "aiff": true, "aif": true}
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var losslessCodecs = map[string]bool{"flac": true, "alac": true, "wavpack": true, "ape": true, "tta": true}
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func lossless(codec string) bool {
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return losslessCodecs[codec] || len(codec) > 4 && codec[:4] == "pcm_"
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}
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// Target решает, что отдать: "" — оригинал, иначе качество транскода.
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// Перекодировать вверх бессмысленно: lossy-исходник не выше целевого битрейта отдаётся как есть.
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func Target(q, format, codec string, bitrate int) string {
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switch q {
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case QualityHigh, QualityMedium, QualityLow:
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default: // auto, original, пусто
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if browserUnplayable[format] {
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return QualityHigh
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}
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return ""
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}
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if lossless(codec) || browserUnplayable[format] {
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return q
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}
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if bitrate > 0 && bitrate <= opusKbps[q]*1000*11/10 {
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return ""
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}
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return q
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}
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// Пороги засчитывания (docs/playback.md#события-прослушивания).
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const (
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countCapMs = 4 * 60 * 1000 // засчитано после min(50% длительности, 4 мин)
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historyMinMs = 30 * 1000 // в историю — от 30 с
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earlySkipMs = 30 * 1000 // ранний скип — до 30 с
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)
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// Outcome — что значит событие окончания попытки (play_end / skip) для статистики.
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type Outcome struct {
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Counted bool // засчитанное прослушивание
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Complete bool // доиграно до конца
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Skip bool
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EarlySkip bool
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History bool // попадает в историю
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PlayedMs int
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}
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// Judge оценивает событие окончания попытки. durationMs — длительность трека.
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func Judge(eventType string, playedMs, durationMs int) Outcome {
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o := Outcome{PlayedMs: max(playedMs, 0)}
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switch eventType {
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case "play_end":
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o.Complete, o.Counted = true, true
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case "skip":
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o.Skip = true
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o.EarlySkip = o.PlayedMs < earlySkipMs
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threshold := min(durationMs/2, countCapMs)
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o.Counted = durationMs > 0 && o.PlayedMs >= threshold
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default:
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return Outcome{}
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}
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o.History = o.PlayedMs >= historyMinMs || (durationMs > 0 && durationMs < historyMinMs && o.Complete)
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return o
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}
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