feat: batch update with laisky's one-api

common/helper/audio.go

@@ -0,0 +1,62 @@
+package helper
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"os"
+	"os/exec"
+	"strconv"
+
+	"github.com/pkg/errors"
+)
+
+// SaveTmpFile saves data to a temporary file. The filename would be apppended with a random string.
+func SaveTmpFile(filename string, data io.Reader) (string, error) {
+	if data == nil {
+		return "", errors.New("data is nil")
+	}
+
+	f, err := os.CreateTemp("", "*-"+filename)
+	if err != nil {
+		return "", errors.Wrapf(err, "failed to create temporary file %s", filename)
+	}
+	defer f.Close()
+
+	_, err = io.Copy(f, data)
+	if err != nil {
+		return "", errors.Wrapf(err, "failed to copy data to temporary file %s", filename)
+	}
+
+	return f.Name(), nil
+}
+
+// GetAudioTokens returns the number of tokens in an audio file.
+func GetAudioTokens(ctx context.Context, audio io.Reader, tokensPerSecond float64) (float64, error) {
+	filename, err := SaveTmpFile("audio", audio)
+	if err != nil {
+		return 0, errors.Wrap(err, "failed to save audio to temporary file")
+	}
+	defer os.Remove(filename)
+
+	duration, err := GetAudioDuration(ctx, filename)
+	if err != nil {
+		return 0, errors.Wrap(err, "failed to get audio tokens")
+	}
+
+	return duration * tokensPerSecond, nil
+}
+
+// GetAudioDuration returns the duration of an audio file in seconds.
+func GetAudioDuration(ctx context.Context, filename string) (float64, error) {
+	// ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {{input}}
+	c := exec.CommandContext(ctx, "/usr/bin/ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", filename)
+	output, err := c.Output()
+	if err != nil {
+		return 0, errors.Wrap(err, "failed to get audio duration")
+	}
+
+	// Actually gpt-4-audio calculates tokens with 0.1s precision,
+	// while whisper calculates tokens with 1s precision
+	return strconv.ParseFloat(string(bytes.TrimSpace(output)), 64)
+}