如何将 Alexa 语音服务集成到自定义 Android 应用程序

Question

我计划开发一个 Android 集成了 Alexa 语音服务的应用程序，以开发像 Reverb 这样的应用程序。以下是我尝试过的...

检查了 AVS 设备 SDK，可以在 Android 中获得正确的实施指南。
已检查 https://github.com/willblaschko/AlexaAndroid，无法正常工作。
打算自己实现，下面是自己做的。

一个。集成登录框架，能够成功登录并获取token

b。创建了一个录音机，可以在本地录音和播放。

c。创建了将音频发送到 https://avs-alexa-eu.amazon.com/v20160207/events

[更新]

将 shortArray 更改为字节数组后，我得到了响应，但现在的问题是 MediaPlayer 无法播放响应 mp3，在准备时出错

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
        }
    }
}

来自 ALEXA 的回应

--------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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Answer 1

我想通了，我正在为 OKHttp 使用 LoggingInterceptor，它用于将字节转换为字符串并记录它，由于某种原因，它无法识别某些字符，并为这些字符提供了一些垃圾值字符，并且由于某种原因，这些值也保留在字节数组中......这曾经给出格式错误的 mp3 文件。删除拦截器后...它开始工作...所以第 1 步已完成...更多内容。

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