Create a gist now

Instantly share code, notes, and snippets.

// Copyright 2016 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
// Command caption reads an audio file and outputs the transcript for it.
package main
import (
"fmt"
"io"
"log"
"os"
"golang.org/x/net/context"
"google.golang.org/api/option"
"google.golang.org/api/transport"
speech "google.golang.org/genproto/googleapis/cloud/speech/v1beta1"
)
func main() {
ctx := context.Background()
conn, err := transport.DialGRPC(ctx,
option.WithEndpoint("speech.googleapis.com:443"),
option.WithScopes("https://www.googleapis.com/auth/cloud-platform"),
)
if err != nil {
log.Fatal(err)
}
defer conn.Close()
stream, err := speech.NewSpeechClient(conn).StreamingRecognize(ctx)
if err != nil {
log.Fatal(err)
}
// send the initial configuration message.
if err := stream.Send(&speech.StreamingRecognizeRequest{
StreamingRequest: &speech.StreamingRecognizeRequest_StreamingConfig{
StreamingConfig: &speech.StreamingRecognitionConfig{
Config: &speech.RecognitionConfig{
Encoding: speech.RecognitionConfig_LINEAR16,
SampleRate: 16000,
},
},
},
}); err != nil {
log.Fatal(err)
}
go func() {
// pipe stdin to the API
buf := make([]byte, 1024)
for {
n, err := os.Stdin.Read(buf)
if err == io.EOF {
return // nothing else to pipe, kill this goroutine
}
if err != nil {
log.Printf("reading stdin error: %v", err)
continue
}
if err = stream.Send(&speech.StreamingRecognizeRequest{
StreamingRequest: &speech.StreamingRecognizeRequest_AudioContent{
AudioContent: buf[:n],
},
}); err != nil {
log.Printf("sending audio error: %v", err)
}
}
}()
for {
resp, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
// TODO: handle error
continue
}
if resp.Error != nil {
// TODO: handle error
continue
}
for _, result := range resp.Results {
fmt.Printf("result: %+v\n", result)
}
}
}
@yanpozka
yanpozka commented Aug 30, 2016 edited

thanks for this gist! where we should put the OAuth 2.0 client ID or token ?

why not "google.golang.org/genproto/googleapis/cloud/speech/v1" ?

@rakyll
Owner
rakyll commented Aug 30, 2016

The sample users the application default credentials, see more at https://developers.google.com/identity/protocols/application-default-credentials.

You need the gcloud command line tool to login.

$ gcloud auth login

If you have Speech API activated on the Cloud console, it should work.

why not "google.golang.org/genproto/googleapis/cloud/speech/v1" ?

v1beta1 is newer than v1, the API's team got the versioning a bit wrong :(

@yanpozka

Oh I understand, thank you 👍 💯

@ImJasonH

This looks really cool! How do you recommend piping audio into stdin from a microphone? Or recorded audio? I've never done anything with audio before.

@yanpozka
yanpozka commented Aug 31, 2016 edited

If you're using debian/ubuntu you can use this command:

rec -c 1 -r 8000 -t wav - | go run livecaption.go

You've to install the pkg sox apt install sox

note: I haven't tested it yet

@rakyll
Owner
rakyll commented Aug 31, 2016

Alternatively, GStreamer should also work on linux. gst-launch pulsesrc | go run livecaption.go.

@ImJasonH
ImJasonH commented Sep 1, 2016

Thanks, I'll give those a shot. I refactored this slightly to package it up, WDYT? https://gist.github.com/ImJasonH/5100f11db40671733a376b230418c484

@ImJasonH
ImJasonH commented Sep 1, 2016

(Also untested so far)

@fiorix
fiorix commented Sep 2, 2016

Can't make it work. First trouble was auth, which i figured from https://cloud.google.com/speech/docs/common/auth, then no more auth errors but no recognition either... tried different sample rates, no luck.

@MikeLeonard

Hi. Just found this via google while trying to get the speech api working via grpc from go... so thanks it's a big help!

I have a .wav file, could you please tell me how I can pipe this in? I'm guessing I'd need to pipe in just the binary audio data and not the wav header, but am not sure how.

Thanks!

@antonmry

It's working for me with the following command:

gst-launch-1.0 -v pulsesrc ! audioconvert ! audioresample ! audio/x-raw,channels=1,rate=16000 ! filesink location=/dev/stdout | go run livecaption.go

Thanks @rakyll , this is a very useful example! 👏

@ssenthil416
ssenthil416 commented Dec 23, 2016 edited

How I can test this in mac environment?

I tried in mac and got this responce only
bash-3.2$ rec -c 1 -r 8000 -t wav - | go run mylivecaption.go
rec WARN formats: can't set sample rate 8000; using 44100
rec WARN formats: can't set 1 channels; using 2
rec WARN wav: Length in output .wav header will be wrong since can't seek to fix it

Input File : 'default' (coreaudio)
Channels : 2
Sample Rate : 44100
Precision : 32-bit
Sample Encoding: 32-bit Signed Integer PCM

In:0.00% 00:01:02.00 [00:00:00.00] Out:495k [ | ] Clip:0 2016/12/23 13:11:53 sending audio error: EOF
2016/12/23 13:11:53 sending audio error: EOF
2016/12/23 13:11:53 sending audio error: EOF

pls let me know how to fix it

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment