Dmitry Sergeev
90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
package playback
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import "fmt"
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type SessionTopology uint8
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const (
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TopologyIdle SessionTopology = iota
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TopologyIndependent
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TopologySynchronized
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)
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func (t SessionTopology) String() string {
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switch t {
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case TopologyIdle:
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return "idle"
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case TopologyIndependent:
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return "independent"
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case TopologySynchronized:
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return "synchronized"
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default:
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return fmt.Sprintf("SessionTopology(%d)", uint8(t))
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}
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}
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type SyncPredicate func(video, audio FeedConfig) bool
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type SessionPlan struct {
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Topology SessionTopology
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// Desired states for independent slots.
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Video FeedConfig
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Audio FeedConfig
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// Desired state for the synchronized slot.
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Sync SyncPairConfig
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}
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func BuildSessionPlan(
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desired SessionConfig,
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canSync SyncPredicate,
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) (SessionPlan, error) {
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if err := desired.Validate(); err != nil {
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return SessionPlan{}, fmt.Errorf("validate desired session: %w", err)
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}
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if desired.SyncRequested &&
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desired.Video.Active &&
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desired.Audio.Active &&
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canSync != nil &&
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canSync(desired.Video, desired.Audio) {
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return SessionPlan{
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Topology: TopologySynchronized,
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Video: stoppedFeed(desired.Video),
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Audio: stoppedFeed(desired.Audio),
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Sync: SyncPairConfig{
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Video: desired.Video,
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Audio: desired.Audio,
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},
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}, nil
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}
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if desired.Video.Active || desired.Audio.Active {
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return SessionPlan{
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Topology: TopologyIndependent,
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Video: desired.Video,
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Audio: desired.Audio,
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Sync: SyncPairConfig{
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Video: stoppedFeed(desired.Video),
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Audio: stoppedFeed(desired.Audio),
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},
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}, nil
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}
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return SessionPlan{
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Topology: TopologyIdle,
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Video: stoppedFeed(desired.Video),
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Audio: stoppedFeed(desired.Audio),
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Sync: SyncPairConfig{
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Video: stoppedFeed(desired.Video),
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Audio: stoppedFeed(desired.Audio),
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},
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}, nil
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}
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func stoppedFeed(config FeedConfig) FeedConfig {
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config.Active = false
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return config
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}
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