How to Integrate Alexa Voice Service to Custom Android App

Question

I am planning to develop an Android App with Alexa Voice Service integration to develop an app like Reverb. Below is what I have tried...

Checked AVS Device SDK, could get a proper guide to implement it in Android.
Checked https://github.com/willblaschko/AlexaAndroid , wasnt able to get it work.
Planned to implement myself, below is what I have done.

a. Integrated Login framework, was able to successfully login and get the token.

b. Created a sound recorder, was able to record and playback locally.

c. Created request to sent audio to https://avs-alexa-eu.amazon.com/v20160207/events

[UPDATED]

After changing the shortArray to Byte array I am getting the response but now the problem is that MediaPlayer is unable to play the response mp3, it gives error at prepare

package com.example.anoopmohanan.alexaandroid

import android.content.Context
import android.media.*
import android.media.AudioFormat.ENCODING_PCM_16BIT
import android.media.AudioFormat.CHANNEL_CONFIGURATION_MONO
import android.os.Environment
import android.os.Environment.getExternalStorageDirectory
import java.io.*
import com.example.anoopmohanan.alexaandroid.ResponseParser.getBoundary
import okhttp3.*
import org.jetbrains.anko.doAsync
import org.json.JSONObject
import java.nio.file.Files.exists
import okhttp3.OkHttpClient
import java.net.HttpURLConnection
import android.os.Looper
import android.os.PowerManager
import android.util.Log
import okio.BufferedSink
import okhttp3.RequestBody
import org.apache.commons.io.FileUtils
import org.jetbrains.anko.Android
import org.jetbrains.anko.runOnUiThread
import org.jetbrains.anko.toast
import java.util.*
import okhttp3.ResponseBody
import okio.Buffer
import com.example.anoopmohanan.alexaandroid.SoundRecorder.LoggingInterceptor
import android.media.MediaDataSource






class SoundRecorder(context: Context) {

    private var appcontext: Context? = null
    private var recording = false
    val MEDIA_JSON = MediaType.parse("application/json; charset=utf-8")
    val MEDIA_TYPE_AUDIO = MediaType.parse("application/octet-stream")
    var accessToken = ""
    private var mediaPlayer: MediaPlayer? = null
    private var streamToSend:ByteArray? = null
    private val client = OkHttpClient.Builder()
            .addInterceptor(LoggingInterceptor())
            .build()

    init {
        this.appcontext = context

    }
    fun startRecording(accessToken: String){
        this.accessToken = accessToken
        doAsync {
            startRecord()
        }

    }

    fun stopRecording(){

        doAsync {
            stopRecord()
        }

    }

    fun playRecording(){

        doAsync {
            playRecord()
        }

    }
    private fun stopRecord(){

        recording = false
        //val file = File(Environment.getExternalStorageDirectory(), "test.pcm")
        //sendAuio(file)
    }

    fun playRecord() {

        val file = File(Environment.getExternalStorageDirectory(), "speech2.mp3")

            val mplayer = MediaPlayer()
            mplayer.setDataSource(file.path)
            mplayer.prepare()
            mplayer.start()
//        val file = File(Environment.getExternalStorageDirectory(), "test.pcm")
//
//        val shortSizeInBytes = java.lang.Short.SIZE / java.lang.Byte.SIZE
//
//        val bufferSizeInBytes = (file.length() / shortSizeInBytes).toInt()
//        val audioData = ByteArray(bufferSizeInBytes)
//
//        try {
//            val inputStream = FileInputStream(file)
//            val bufferedInputStream = BufferedInputStream(inputStream)
//            val dataInputStream = DataInputStream(bufferedInputStream)
//
//            var i = 0
//            while (dataInputStream.available() > 0) {
//                audioData[i] = dataInputStream.readByte()
//                i++
//            }
//
//            dataInputStream.close()
//
//            val audioTrack = AudioTrack.Builder()
//                    .setAudioAttributes(AudioAttributes.Builder()
//                            .setUsage(AudioAttributes.USAGE_MEDIA)
//                            .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
//                            .build())
//                    .setAudioFormat(AudioFormat.Builder()
//                            .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
//                            .setSampleRate(16000)
//                            .setChannelMask(AudioFormat.CHANNEL_OUT_MONO).build())
//                    .setBufferSizeInBytes(bufferSizeInBytes)
//                    .setTransferMode(AudioTrack.MODE_STREAM)
//                    .build()
//
//            audioTrack.play()
//            audioTrack.write(audioData, 0, bufferSizeInBytes)
//
//
//        } catch (e: FileNotFoundException) {
//            e.printStackTrace()
//        } catch (e: IOException) {
//            e.printStackTrace()
//        }

    }



    private fun startRecord() {

        val file = File(Environment.getExternalStorageDirectory(), "test.pcm")

        try {
            file.createNewFile()

            val outputStream = FileOutputStream(file)
            val bufferedOutputStream = BufferedOutputStream(outputStream)
            val dataOutputStream = DataOutputStream(bufferedOutputStream)

            val minBufferSize = AudioRecord.getMinBufferSize(16000,
                    AudioFormat.CHANNEL_IN_MONO,
                    AudioFormat.ENCODING_PCM_16BIT)


            val audioData = ByteArray(minBufferSize)

            val audioRecord = AudioRecord(MediaRecorder.AudioSource.MIC,
                    16000,
                    AudioFormat.CHANNEL_IN_MONO,
                    AudioFormat.ENCODING_PCM_16BIT,
                    800)
            if (audioRecord.recordingState != AudioRecord.RECORDSTATE_STOPPED){

                this.appcontext?.runOnUiThread {
                    toast("No recording source available")
                }

                return
            }
            recording = true
            audioRecord.startRecording()
            if (audioRecord.recordingState != AudioRecord.RECORDSTATE_RECORDING){

                this.appcontext?.runOnUiThread {
                    toast("Someone is still recording")
                }
                recording = false
                audioRecord.stop()
                audioRecord.release()
                return
            }

            this.appcontext?.runOnUiThread {
                toast("Recording started hurray")
            }
            while (recording) {
                audioRecord.read(audioData, 0, minBufferSize)
                dataOutputStream.write(audioData,0,minBufferSize)
//                for (i in 0 until numberOfShort) {
//                    dataOutputStream.writeShort(audioData[i].toInt())
//                }
            }

            audioRecord.stop()
            audioRecord.release()
            dataOutputStream.close()
            sendAuio(file)

        } catch (e: IOException) {

            e.printStackTrace()
        }

    }

    fun sendAuio(audio: File){

        streamToSend = audio.readBytes()
        val requestBody = MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("metadata","metadata",RequestBody.create(MEDIA_JSON, generateSpeechMetadata()))
                .addFormDataPart("audio", "test.pcm",
                        RequestBody.create(MEDIA_TYPE_AUDIO, streamToSend))
                .build()

        val request = Request.Builder()
                .url("https://avs-alexa-eu.amazon.com/v20160207/events")
                .addHeader("Authorization","Bearer $accessToken")
                .post(requestBody)
                .build()
        print (request.body().toString())
        client.newCall(request).execute().use({ response ->
            if (!response.isSuccessful()) throw IOException("Unexpected code $response")

            val items = if (response.code() == HttpURLConnection.HTTP_NO_CONTENT)
                AvsResponse()
            else
                ResponseParser.parseResponse(response.body()!!.byteStream(), getBoundary(response))
            if (items.size > 0){

                handle(items)
            }
            System.out.println("[TRACE]"+response.body()!!.string())
        })
    }

    @Throws(IOException::class)
    fun toByteArray(`in`: InputStream): ByteArray {
        val out = ByteArrayOutputStream()
        var read = 0
        val buffer = ByteArray(1024)
        while (read != -1) {
            read = `in`.read(buffer)
            if (read != -1)
                out.write(buffer, 0, read)
        }
        out.close()
        return out.toByteArray()
    }
    private fun generateSpeechMetadata(): String {
        val messageId = UUID.randomUUID().toString();
        val dialogId = UUID.randomUUID().toString();

        return  "{\"event\": {\"header\": {\"namespace\": \"SpeechRecognizer\",\"name\": \"Recognize\",\"messageId\": \"$messageId\",\"dialogRequestId\": \"$dialogId\"},\"payload\": {\"profile\": \"CLOSE_TALK\", \"format\": \"AUDIO_L16_RATE_16000_CHANNELS_1\"}},\"context\": [{\"header\": {\"namespace\": \"AudioPlayer\",\"name\": \"PlaybackState\"},\"payload\": {\"token\": \"\",\"offsetInMilliseconds\": 0,\"playerActivity\": \"FINISHED\"}}, {\"header\": {\"namespace\": \"SpeechSynthesizer\",\"name\": \"SpeechState\"},\"payload\": {\"token\": \"\",\"offsetInMilliseconds\": 0,\"playerActivity\": \"FINISHED\"}}, { \"header\" : { \"namespace\" : \"Alerts\", \"name\" : \"AlertsState\" }, \"payload\" : { \"allAlerts\" : [ ], \"activeAlerts\" : [ ] } }, {\"header\": {\"namespace\": \"Speaker\",\"name\": \"VolumeState\"},\"payload\": {\"volume\": 25,\"muted\": false}}]}"
//        return "{\n" +
//                "\"messageHeader\": {\n" +
//                "\"deviceContext\": [\n" +
//                "{\n" +
//                "\"name\": \"playbackState\",\n" +
//                "\"namespace\": \"AudioPlayer\",\n" +
//                "\"payload\": {\n" +
//                "\"streamId\": \"\",\n" +
//                "\"offsetInMilliseconds\": \"\",\n" +
//                "\"playerActivity\": \"IDLE\"\n" +
//                "}\n" +
//                "}\n" +
//                "]\n" +
//                "},\n" +
//                "\"messageBody\": {\n" +
//                "\"profile\": \"doppler-scone\",\n" +
//                "\"locale\": \"en-us\",\n" +
//                "\"format\": \"audio/L16; rate=16000; channels=1\"\n" +
//                "}\n" +
//                "}"
    }


    private val audioRequestBody = object : RequestBody() {
        override fun contentType(): MediaType? {
            return MediaType.parse("application/octet-stream")
        }

        @Throws(IOException::class)
        override fun writeTo(sink: BufferedSink?) {
            //while our recorder is not null and it is still recording, keep writing to POST data
            sink!!.write(streamToSend)
        }
    }

    inner class LoggingInterceptor : Interceptor {
        @Throws(IOException::class)
        override fun intercept(chain: Interceptor.Chain): Response {
            val request = chain.request()

            val t1 = System.nanoTime()
            Log.d("OkHttp", String.format("--> Sending request %s on %s%n%s", request.url(), chain.connection(), request.headers()))

            val requestBuffer = Buffer()
            request.body()?.writeTo(requestBuffer)
            Log.d("OkHttp", requestBuffer.readUtf8())

            val response = chain.proceed(request)

            val t2 = System.nanoTime()
            Log.d("OkHttp", String.format("<-- Received response for %s in %.1fms%n%s", response.request().url(), (t2 - t1) / 1e6, response.headers()))

            val contentType = response.body()?.contentType()
            val content = response.body()?.string()
            Log.d("OkHttp", content)

            val wrappedBody = ResponseBody.create(contentType, content)
            return response.newBuilder().body(wrappedBody).build()
        }
    }


    private fun getMediaPlayer(): MediaPlayer? {
        if (mediaPlayer == null) {
            mediaPlayer = MediaPlayer()
        }
        return mediaPlayer
    }

    fun handle(items:AvsResponse){

        for (item in items){
            handle(item)
        }
    }
    fun handle(item: AvsItem){


        if (item is AvsSpeakItem){

        }else{
            return
        }
        //cast our item for easy access
        //write out our raw audio data to a file
        val path = File(Environment.getExternalStorageDirectory(), "speech.mp3")

        //path.deleteOnExit()
        //val path = File(appcontext!!.getCacheDir(), System.currentTimeMillis().toString() + ".mp3")
        //var fos: FileOutputStream? = null
        try {
//            fos = FileOutputStream(path)
//            fos!!.write(item.audio)
//            fos.close()

            path.createNewFile()
            path.writeBytes(item.audio)
//            var ds = ByteArrayMediaDataSource(item.audio)
//            val fis = FileInputStream(path)
//            //play our newly-written file
//            val mplayer = MediaPlayer()
//            mplayer.setDataSource(path.path)
//            mplayer.prepare()
//            mplayer.start()
//            getMediaPlayer()?.setDataSource(fis.fd)
//            getMediaPlayer()?.prepare()
//            getMediaPlayer()?.start()
        } catch (e: IOException) {
            e.printStackTrace()

        } catch (e: IllegalStateException) {
            e.printStackTrace()
        }

    }


    inner class ByteArrayMediaDataSource(private val data: ByteArray?) : MediaDataSource() {

        init {
            assert(data != null)
        }

        @Throws(IOException::class)
        override fun readAt(position: Long, buffer: ByteArray, offset: Int, size: Int): Int {
            System.arraycopy(data, position.toInt(), buffer, offset, size)
            return size
        }

        @Throws(IOException::class)
        override fun getSize(): Long {
            return data?.size?.toLong()!!
        }

        @Throws(IOException::class)
        override fun close() {
            // Nothing to do here
        }
    }
}

RESPONSE FROM ALEXA

--------abcde123
Content-Type: application/json; charset=UTF-8

{"directive":{"header":{"namespace":"SpeechSynthesizer","name":"Speak","messageId":"d58c83fe-377f-4d1d-851b-a68cf5686280","dialogRequestId":"d83b8496-e6a5-4fc5-b07b-32f70acd1f15"},"payload":{"url":"cid:2aed5305-081d-4624-b2ba-ef51eba6aa32_1353236331","format":"AUDIO_MPEG","token":"amzn1.as-ct.v1.Domain:Application:Knowledge#ACRI#2aed5305-081d-4624-b2ba-ef51eba6aa32"}}}
--------abcde123
Content-ID: <2aed5305-081d-4624-b2ba-ef51eba6aa32_1353236331>
Content-Type: application/octet-stream

ID3#TSSELavf57.71.100dUC\[QwwD뻝q    \[D*An. .`>X>>@|L?&|>4=A?w'<<Ɨd"_h{[M̢8j8ǙbA

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anoop4real anoop4real · Accepted Answer · 2018-05-30T09:40:36

I figured it out, I was using a LoggingInterceptor for OKHttp and it use to convert the bytes to string and log it and due to some reason, it is unable to recognize some characters and it gives some junk values for those characters and due to some reason, those values persisted back in the byte array also... which used to give malformed mp3 file. After removing the interceptor...it started working... so step 1 is done...more to go.

How to Integrate Alexa Voice Service to Custom Android App

1 Answers