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feat: add transcript endpoint (#211)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package whisper | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
|
|
||
| "github.com/ggerganov/whisper.cpp/bindings/go/pkg/whisper" | ||
| wav "github.com/go-audio/wav" | ||
| ) | ||
|
|
||
| func sh(c string) (string, error) { | ||
| cmd := exec.Command("/bin/sh", "-c", c) | ||
| cmd.Env = os.Environ() | ||
| o, err := cmd.CombinedOutput() | ||
| return string(o), err | ||
| } | ||
|
|
||
| // AudioToWav converts audio to wav for transcribe. It bashes out to ffmpeg | ||
| // TODO: use https://github.com/mccoyst/ogg? | ||
| func audioToWav(src, dst string) error { | ||
| out, err := sh(fmt.Sprintf("ffmpeg -i %s -format s16le -ar 16000 -ac 1 -acodec pcm_s16le %s", src, dst)) | ||
| if err != nil { | ||
| return fmt.Errorf("error: %w out: %s", err, out) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func Transcript(modelpath, audiopath, language string) (string, error) { | ||
|
|
||
| dir, err := os.MkdirTemp("", "whisper") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer os.RemoveAll(dir) | ||
|
|
||
| convertedPath := filepath.Join(dir, "converted.wav") | ||
|
|
||
| if err := audioToWav(audiopath, convertedPath); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| // Open samples | ||
| fh, err := os.Open(convertedPath) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer fh.Close() | ||
|
|
||
| // Read samples | ||
| d := wav.NewDecoder(fh) | ||
| buf, err := d.FullPCMBuffer() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| data := buf.AsFloat32Buffer().Data | ||
|
|
||
| // Load the model | ||
| model, err := whisper.New(modelpath) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer model.Close() | ||
|
|
||
| // Process samples | ||
| context, err := model.NewContext() | ||
| if err != nil { | ||
| return "", err | ||
|
|
||
| } | ||
|
|
||
| if language != "" { | ||
| context.SetLanguage(language) | ||
| } | ||
|
|
||
| if err := context.Process(data, nil); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| text := "" | ||
| for { | ||
| segment, err := context.NextSegment() | ||
| if err != nil { | ||
| break | ||
| } | ||
| text += segment.Text | ||
| } | ||
|
|
||
| return text, nil | ||
| } |