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Add universal PCM transcoder

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This commit is contained in:
Alex X
2025-03-25 13:10:16 +03:00
parent 7415776e4d
commit f535595d1f
5 changed files with 339 additions and 251 deletions
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pkg/alsa/playback_linux.go
+9 -9
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@@ -42,23 +42,23 @@ func (p *Playback) GetTrack(media *core.Media, codec *core.Codec) (*core.Receive
}
func (p *Playback) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error {
in := track.Codec
src := track.Codec
// support probe
if in.Name == core.CodecAny {
in = &core.Codec{
if src.Name == core.CodecAny {
src = &core.Codec{
Name: core.CodecPCML,
ClockRate: 16000,
Channels: 2,
}
}
out := &core.Codec{
dst := &core.Codec{
Name: core.CodecPCML,
ClockRate: in.ClockRate,
ClockRate: src.ClockRate,
Channels: 2,
}
sender := core.NewSender(media, out)
sender := core.NewSender(media, dst)
sender.Handler = func(pkt *rtp.Packet) {
if n, err := p.dev.Write(pkt.Payload); err == nil {
@@ -66,15 +66,15 @@ func (p *Playback) AddTrack(media *core.Media, codec *core.Codec, track *core.Re
}
}
if sender.Handler = pcm.Convert(in, out, sender.Handler); sender.Handler == nil {
return fmt.Errorf("alsa: can't convert %s to %s", in, out)
if sender.Handler = pcm.TranscodeHandler(dst, src, sender.Handler); sender.Handler == nil {
return fmt.Errorf("alsa: can't convert %s to %s", src, dst)
}
// typical card support:
// - Formats: S16_LE, S32_LE
// - ClockRates: 8000 - 192000
// - Channels: 2 - 10
err := p.dev.SetHWParams(device.SNDRV_PCM_FORMAT_S16_LE, out.ClockRate, 2)
err := p.dev.SetHWParams(device.SNDRV_PCM_FORMAT_S16_LE, dst.ClockRate, 2)
if err != nil {
return err
}