64 lines
1.2 KiB
Go
64 lines
1.2 KiB
Go
package flac
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"os/exec"
|
|
"strconv"
|
|
)
|
|
|
|
type Metadata struct {
|
|
SampleRate int64
|
|
BPS int64
|
|
Channels int64
|
|
NumSamples int64 // Total length of file in samples (per channel).
|
|
}
|
|
|
|
func GetMetadata(path string) (md Metadata, err error) {
|
|
cmd := exec.Command(
|
|
"metaflac",
|
|
"--show-sample-rate",
|
|
"--show-bps",
|
|
"--show-channels",
|
|
"--show-total-samples",
|
|
path)
|
|
|
|
out, err := cmd.Output()
|
|
if err != nil {
|
|
return md, fmt.Errorf("Failed to open file: %w", err)
|
|
}
|
|
|
|
l := bytes.Split(out, []byte{'\n'})
|
|
if len(l) != 5 {
|
|
return md, fmt.Errorf("Output not understood:\n%s", out)
|
|
}
|
|
l = l[:4]
|
|
|
|
md.SampleRate, err = strconv.ParseInt(string(l[0]), 10, 64)
|
|
if err != nil {
|
|
return md, fmt.Errorf("Invalid sample rate: %w", err)
|
|
}
|
|
|
|
md.BPS, err = strconv.ParseInt(string(l[1]), 10, 64)
|
|
if err != nil {
|
|
return md, fmt.Errorf("Invalid bps: %w", err)
|
|
}
|
|
|
|
md.Channels, err = strconv.ParseInt(string(l[2]), 10, 64)
|
|
if err != nil {
|
|
return md, fmt.Errorf("Invalid channels: %w", err)
|
|
}
|
|
|
|
md.NumSamples, err = strconv.ParseInt(string(l[3]), 10, 64)
|
|
if err != nil {
|
|
return md, fmt.Errorf("Invalid length: %w", err)
|
|
}
|
|
|
|
return md, nil
|
|
}
|
|
|
|
func Load(path string, nSamples int64) (L []float32, R []float32, err error) {
|
|
// TODO!
|
|
return
|
|
}
|