Synthesizing Speech

This example uses the SynthesizeSpeech operation to get the text from a file and produce an MP3 file containing the synthesized speech.

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Create the file pollySynthesizeSpeech.go. Import the packages used in the example.

import (
    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/polly"

    "fmt"
    "os"
    "strings"
    "io"
    "io/ioutil"
)

Get the name of the text file from the command line.

if len(os.Args) != 2 {
    fmt.Println("You must supply an alarm name")
    os.Exit(1)
}

fileName := os.Args[1]

Open the text file and read the contents as a string.

contents, err := ioutil.ReadFile(fileName)
s := string(contents[:])

Initialize a session that the SDK will use to load credentials from the shared credentials file ~/.aws/credentials, load your configuration from the shared configuration file ~/.aws/config, and create an Amazon Polly client.

sess := session.Must(session.NewSessionWithOptions(session.Options{
    SharedConfigState: session.SharedConfigEnable,
}))

svc := polly.New(sess)

Create the input for and call SynthesizeSpeech.

input := &polly.SynthesizeSpeechInput{OutputFormat: aws.String("mp3"), Text: aws.String(s), VoiceId: aws.String("Joanna")}

output, err := svc.SynthesizeSpeech(input)

Save the resulting synthesized speech as an MP3 file.

names := strings.Split(fileName, ".")
name := names[0]
mp3File := name + ".mp3"

outFile, err := os.Create(mp3File)
defer outFile.Close()

See the complete example on GitHub.