✨ Fingerprinting audio

media/fingerprint.go

@@ -0,0 +1,88 @@
+package media
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	u "net/url"
+	"os/exec"
+	"strings"
+
+	"codeberg.org/danjones000/strip-beats/config"
+)
+
+type FPrint struct {
+	Duration    float64
+	Fingerprint string
+}
+
+func Fingerprint(path string) (FPrint, error) {
+	pr := FPrint{}
+	_, err := exec.LookPath("fpcalc")
+	if err != nil {
+		return pr, errors.Join(errors.New("Unable to find fpcalc in PATH"), err)
+	}
+	cmd := exec.Command("fpcalc", "-json", path)
+	out, err := cmd.Output()
+	if err != nil {
+		return pr, errors.Join(errors.New(fmt.Sprintf("Failed to run %s", strings.Join(cmd.Args, " "))), err)
+	}
+	err = json.Unmarshal(out, &pr)
+	if err != nil {
+		return pr, errors.Join(errors.New("Couldn't parse output from fpcalc"), err)
+	}
+
+	return pr, nil
+}
+
+type IdResults struct {
+	Status  string
+	Results []IdResult
+	Error   IdError
+}
+
+type IdResult struct {
+	Id         string
+	Score      float64
+	Recordings []MbRecording
+}
+
+type IdError struct {
+	Code    int
+	Message string
+}
+
+type MbRecording struct {
+	Id string
+}
+
+func LookupFingerprint(print FPrint) (IdResults, error) {
+	res := IdResults{}
+	key := config.GetConfig().AcousticIdKey
+	if key == "" {
+		return res, errors.New("Missing acoustic_id_key from config")
+	}
+	url := "https://api.acoustid.org/v2/lookup"
+	form := u.Values{
+		"format":      {"json"},
+		"client":      {key},
+		"duration":    {fmt.Sprintf("%.0f", print.Duration)},
+		"fingerprint": {print.Fingerprint},
+		"meta":        {"recordingids"}}
+	resp, err := http.PostForm(url, form)
+	if err != nil {
+		return res, err
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return res, err
+	}
+	json.Unmarshal(body, &res)
+	if res.Status == "error" {
+		err = errors.New(res.Error.Message)
+	}
+	return res, err
+}