From 04f11226db16393d6037c723c2763690f337e5f1 Mon Sep 17 00:00:00 2001 From: Katharine Berry Date: Sun, 9 Jul 2023 14:04:01 -0700 Subject: [PATCH] add abandoned asr3 for posterity --- README.md | 8 ++ go.mod | 33 +++++++ go.sum | 199 +++++++++++++++++++++++++++++++++++++++++ main.go | 5 ++ service/service.go | 218 +++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 463 insertions(+) create mode 100644 README.md create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 service/service.go diff --git a/README.md b/README.md new file mode 100644 index 0000000..ab45960 --- /dev/null +++ b/README.md @@ -0,0 +1,8 @@ +# asr3 + +This project was intended to be an enhanced version of the rebble-asr service, +featuring streaming transcriptions as originally intended by Pebble. + +However, since the latency improvements are unlikely to be significant (the existing +service is pretty fast already), and the complexity is notably greater, it lies +abandoned and is recorded here for posterity. diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..72999c4 --- /dev/null +++ b/go.mod @@ -0,0 +1,33 @@ +module github.com/pebble-dev/rebble-asr + +go 1.20 + +require ( + cloud.google.com/go/speech v1.17.1 + google.golang.org/api v0.126.0 + google.golang.org/protobuf v1.30.0 +) + +require ( + cloud.google.com/go v0.110.2 // indirect + cloud.google.com/go/compute v1.19.3 // indirect + cloud.google.com/go/compute/metadata v0.2.3 // indirect + cloud.google.com/go/longrunning v0.5.0 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/s2a-go v0.1.4 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.2.3 // indirect + github.com/googleapis/gax-go/v2 v2.11.0 // indirect + go.opencensus.io v0.24.0 // indirect + golang.org/x/crypto v0.9.0 // indirect + golang.org/x/net v0.10.0 // indirect + golang.org/x/oauth2 v0.8.0 // indirect + golang.org/x/sys v0.8.0 // indirect + golang.org/x/text v0.9.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/genproto v0.0.0-20230530153820-e85fd2cbaebc // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20230530153820-e85fd2cbaebc // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20230530153820-e85fd2cbaebc // indirect + google.golang.org/grpc v1.55.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..1a881dd --- /dev/null +++ b/go.sum @@ -0,0 +1,199 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.110.2 h1:sdFPBr6xG9/wkBbfhmUz/JmZC7X6LavQgcrVINrKiVA= +cloud.google.com/go v0.110.2/go.mod h1:k04UEeEtb6ZBRTv3dZz4CeJC3jKGxyhl0sAiVVquxiw= +cloud.google.com/go/compute v1.19.3 h1:DcTwsFgGev/wV5+q8o2fzgcHOaac+DKGC91ZlvpsQds= +cloud.google.com/go/compute v1.19.3/go.mod h1:qxvISKp/gYnXkSAD1ppcSOveRAmzxicEv/JlizULFrI= +cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY= +cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA= +cloud.google.com/go/longrunning v0.5.0 h1:DK8BH0+hS+DIvc9a2TPnteUievsTCH4ORMAASSb7JcQ= +cloud.google.com/go/longrunning v0.5.0/go.mod h1:0JNuqRShmscVAhIACGtskSAWtqtOoPkwP0YF1oVEchc= +cloud.google.com/go/speech v1.17.1 h1:KIV99afoYTJqA2qi8Cjbl5DpjSRzvqFgKcptGXg6kxw= +cloud.google.com/go/speech v1.17.1/go.mod h1:8rVNzU43tQvxDaGvqOhpDqgkJTFowBpDvCJ14kGlJYo= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= 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"cloud.google.com/go/speech/apiv1/speechpb" + "context" + "encoding/json" + "errors" + "fmt" + "google.golang.org/api/option" + "google.golang.org/protobuf/types/known/wrapperspb" + "io" + "log" + "mime/multipart" + "net/http" + "strings" + "time" +) + +type Service struct { + mux *http.ServeMux + client *http.Client + speech *speech.Client +} + +func New() *Service { + sc, err := speech.NewClient(context.Background(), + option.WithAPIKey("some key")) + if err != nil { + panic(fmt.Sprintf("speech startup failed: %s!", err)) + } + s := &Service{ + mux: http.NewServeMux(), + client: &http.Client{ + Timeout: 5 * time.Second, + }, + speech: sc, + } + s.mux.HandleFunc("/NmspServlet/", s.nmsp) + return s +} + +func (s *Service) Close() error { + return s.speech.Close() +} + +func (s *Service) nmsp(rw http.ResponseWriter, request *http.Request) { + accessToken, lang, err := tokensFromHost(request.Host) + if err != nil { + http.Error(rw, err.Error(), http.StatusBadRequest) + return + } + if err := s.authenticate(accessToken, request.Context()); err != nil { + http.Error(rw, err.Error(), http.StatusUnauthorized) + return + } + + reader, err := request.MultipartReader() + if err != nil { + http.Error(rw, fmt.Sprintf("failed to open reader: %s", err), 400) + return + } + + // start an async request to ASR + rec, err := s.speech.StreamingRecognize(request.Context()) + if err != nil { + http.Error(rw, fmt.Sprintf("starting speech recognition failed: %s", err), http.StatusInternalServerError) + } + + err = rec.Send(&speechpb.StreamingRecognizeRequest{ + StreamingRequest: &speechpb.StreamingRecognizeRequest_StreamingConfig{ + StreamingConfig: &speechpb.StreamingRecognitionConfig{ + Config: &speechpb.RecognitionConfig{ + Encoding: speechpb.RecognitionConfig_SPEEX_WITH_HEADER_BYTE, + SampleRateHertz: 16000, + AudioChannelCount: 1, + LanguageCode: lang, + MaxAlternatives: 1, + ProfanityFilter: false, + EnableWordTimeOffsets: false, + EnableWordConfidence: true, // this gets passed all the way to Pebble, which does nothing? + EnableAutomaticPunctuation: true, // controversial. + EnableSpokenPunctuation: wrapperspb.Bool(true), + EnableSpokenEmojis: wrapperspb.Bool(false), // tentatively disabled due to poor font support. + Metadata: &speechpb.RecognitionMetadata{ + MicrophoneDistance: speechpb.RecognitionMetadata_NEARFIELD, + }, + Model: "latest_short", // apparently this is the New Hotness + UseEnhanced: false, + }, + SingleUtterance: false, // end-of-utterance detection is done by Pebble + InterimResults: false, // the pebble protocol doesn't have any way to deal with these + EnableVoiceActivityEvents: false, // we don't need this + VoiceActivityTimeout: nil, // again, handled by the Pebble device. + }, + }, + }) + if err != nil { + http.Error(rw, fmt.Sprintf("setting up dictation session failed: %s", err), http.StatusInternalServerError) + return + } + + go func() { + for { + part, err := reader.NextPart() + if err == io.EOF { + break + } + if err != nil { + break + } + if part.FormName() == "ConcludingAudioParameter" { + bytes, err := io.ReadAll(part) + if err != nil { + // TODO: something? + break + } + err = rec.Send(&speechpb.StreamingRecognizeRequest{ + StreamingRequest: &speechpb.StreamingRecognizeRequest_AudioContent{ + AudioContent: bytes, + }, + }) + if err != nil { + // TODO: something? + break + } + } + } + }() + + mp := multipart.NewWriter(rw) + must(mp.SetBoundary("--Nuance_NMSP_vutc5w1XobDdefsYG3wq")) + rw.Header().Set("Content-Type", "multipart/form-data; boundary="+mp.Boundary()) + rw.WriteHeader(200) + + firstWord := true + + for { + resp, err := rec.Recv() + if err == io.EOF { + break + } + + tr := TranscriptionResponse{} + + for _, result := range resp.Results { + if len(result.Alternatives) == 0 { + continue + } + for _, word := range result.Alternatives[0].Words { + tr.Words = append(tr.Words, TranscriptionWord{ + Word: word.Word, + Confidence: word.Confidence, + }) + } + } + + if firstWord && len(tr.Words) > 0 { + tr.Words[0].Word = tr.Words[0].Word + `\*no-space-before` + firstWord = false + } + + content, err := json.Marshal(tr) + if err != nil { + log.Printf("Failed to marshal response JSON: %s", err) + continue + } + + if err := mp.WriteField("QueryResult", string(content)); err != nil { + log.Printf("Failed to write response JSON: %s", err) + continue + } + } + _ = mp.Close() +} + +func must(err error) { + if err != nil { + panic(err) + } +} + +type TranscriptionWord struct { + Word string `json:"word"` + Confidence float32 `json:"confidence"` +} + +type TranscriptionResponse struct { + Words []TranscriptionWord `json:"words"` +} + +func (s *Service) authenticate(accessToken string, ctx context.Context) error { + authReq, err := http.NewRequestWithContext(ctx, "GET", "%s/api/v1/me/token", nil) + if err != nil { + return fmt.Errorf("couldn't create auth request: %w", err) + } + authReq.Header.Add("Authorization", "Bearer "+accessToken) + resp, err := s.client.Do(authReq) + if err != nil { + return fmt.Errorf("requesting authorization failed: %w", err) + } + if resp.StatusCode != 200 { + return errors.New("unauthorised") + } + return nil +} + +func tokensFromHost(host string) (accessToken, lang string, err error) { + hostParts := strings.SplitN(strings.SplitN(host, ".", 2)[0], "-", 2) + if len(hostParts) != 2 { + return "", "", fmt.Errorf("invalid host %q", host) + } + return hostParts[0], hostParts[1], nil +} + +func (s *Service) ListenAndServe(addr string) error { + return http.ListenAndServe(addr, s.mux) +}