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package soundbox
/*
#cgo pkg-config: libpipewire-0.3
#include "pipewire-binding.h"
*/
import "C"
import (
"bytes"
"context"
"io"
"log"
"net"
"os/exec"
"unsafe"
)
var pipewireAudio = make(chan []byte, 5)
func s16leDropSilence(input []byte) []byte {
output := make([]byte, 0)
for i := 0; i < (len(input) - 1); i += 2 {
if input[i] == byte(0) && input[i+1] == byte(0) {
continue
}
output = append(output, input[i])
output = append(output, input[i+1])
}
return output
}
func StreamPipewireContext(ctx context.Context, targets []net.HardwareAddr) error {
cmd := exec.CommandContext(
ctx,
"ffmpeg",
"-ac",
"2",
"-ar",
"48000",
"-f",
"s16le",
"-channel_layout",
"stereo",
"-i",
"-",
"-acodec",
"flac",
"-f",
"ogg",
"-",
)
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
stdin, err := cmd.StdinPipe()
if err != nil {
return err
}
go C.pw_stdout()
go func() {
for buffer := range pipewireAudio {
tempReader := bytes.NewReader(s16leDropSilence(buffer))
_, err := io.Copy(stdin, tempReader)
if err != nil {
log.Println("Failed to copy from PipeWire to ffmpeg.")
break
}
}
}()
err = cmd.Start()
if err != nil {
return err
}
err = streamContext(ctx, stdout, targets)
if err != nil {
return err
}
return cmd.Wait()
}
//export goHandleData
func goHandleData(data *C.int16_t, size C.size_t) {
buf := C.GoBytes(unsafe.Pointer(data), C.int(size))
pipewireAudio <- buf
}
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