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sequence.go
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sequence.go
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package play
import (
"context"
"time"
"github.com/CyCoreSystems/ari"
"github.com/pkg/errors"
uuid "github.com/satori/go.uuid"
)
// sequence represents an audio sequence playback session
type sequence struct {
cancel context.CancelFunc
s *playSession
done chan struct{}
}
func (s *sequence) Done() <-chan struct{} {
return s.done
}
func (s *sequence) Stop() {
if s.cancel != nil {
s.cancel()
}
}
func newSequence(s *playSession) *sequence {
return &sequence{
s: s,
done: make(chan struct{}),
}
}
func (s *sequence) Play(ctx context.Context, p ari.Player) {
ctx, cancel := context.WithCancel(ctx)
s.cancel = cancel
defer cancel()
defer close(s.done)
for u := s.s.o.uriList.First(); u != ""; u = s.s.o.uriList.Next() {
pb, err := p.StagePlay(uuid.NewV1().String(), u)
if err != nil {
s.s.result.Status = Failed
s.s.result.Error = errors.Wrap(err, "failed to stage playback")
return
}
s.s.result.Status, err = playStaged(ctx, pb, s.s.o.playbackStartTimeout)
if err != nil {
s.s.result.Error = errors.Wrap(err, "failure in playback")
return
}
}
}
// playStaged executes a staged playback, waiting for its completion
func playStaged(ctx context.Context, h *ari.PlaybackHandle, timeout time.Duration) (Status, error) {
started := h.Subscribe(ari.Events.PlaybackStarted)
defer started.Cancel()
finished := h.Subscribe(ari.Events.PlaybackFinished)
defer finished.Cancel()
err := h.Exec()
if err != nil {
return Failed, errors.Wrap(err, "failed to start playback")
}
defer h.Stop() // nolint: errcheck
select {
case <-ctx.Done():
return Cancelled, nil
case <-started.Events():
case <-finished.Events():
return Finished, nil
case <-time.After(timeout):
return Timeout, errors.New("timeout waiting for playback to start")
}
// Wait for playback to complete
select {
case <-ctx.Done():
return Cancelled, nil
case <-finished.Events():
return Finished, nil
}
}