74 lines
1.1 KiB
Go
74 lines
1.1 KiB
Go
package ffmpeg
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import (
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"bytes"
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"context"
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"log"
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"os"
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"os/exec"
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"strconv"
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"time"
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)
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type FFmpeg struct {
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Out *bytes.Buffer
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Cmd *exec.Cmd
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Started bool
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Cancel context.CancelFunc
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Len time.Duration
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Title string
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Channel string
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}
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func NewFFmpeg(uri string, sampleRate int, channels int) (ff *FFmpeg, err error) {
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ff = new(FFmpeg)
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ctx, cancel := context.WithCancel(context.Background())
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ff.Cancel = cancel
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ff.Cmd = exec.CommandContext(
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ctx,
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"ffmpeg",
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"-i", uri,
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"-f", "s16le",
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"-v", "error",
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//"-stats",
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"-ar", strconv.Itoa(sampleRate),
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"-ac", strconv.Itoa(channels),
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"-af", "loudnorm=I=-16:LRA=11:TP=-1.5",
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"-threads", "4",
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"pipe:1",
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)
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ff.Cmd.Stderr = os.Stdin
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ff.Out = bytes.NewBuffer(make([]byte, 1024))
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ff.Cmd.Stdout = ff.Out
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return
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}
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func (ff *FFmpeg) Start() error {
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err := ff.Cmd.Start()
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if err != nil {
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return err
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}
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// We need to wait till the buffer starts filling up..
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for ff.Out.Len() == 1024 {
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}
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ff.Started = true
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go func() {
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// Wait till this is empty..
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log.Println(ff.Cmd.Wait())
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}()
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return err
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}
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func (ff FFmpeg) Close() error {
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ff.Cancel()
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return nil
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}
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