使用Alex流式处理音频的最简单示例

Question

我正在尝试启动新的流音频API。以下回答有效吗？当我在我的设备上测试它时，我得到了一个“技能有问题”的错误。

下面是我的AWS lambda函数的代码：

def lambda_handler(event, context):
    return {
        "response": {
            "directives": [
                {
                    "type": "AudioPlayer.Play",
                    "playBehavior": "REPLACE_ALL",
                    "audioItem": {
                        "stream": {
                            "token": "12345",
                            "url": "http://emit-media-production.s3.amazonaws.com/pbs/the-afterglow/2016/08/24/1700/201608241700_the-afterglow_64.m4a",
                            "offsetInMilliseconds": 0
                        }
                    }
                }
            ],
            "shouldEndSession": True
        }
    }

Answer 1

我们在Github上创建了一个非常简单的项目，展示了使用音频播放器的最简单方法：
https://github.com/bespoken/super-simple-audio-player

我们还为它创建了一个writeup：
https://bespoken.tools/blog/2017/02/27/super-simple-audioplayer

该项目演示如何播放曲目，以及暂停和继续。

下面是显示音频文件实际播放的代码：

SimplePlayer.prototype.play = function (audioURL, offsetInMilliseconds) {
    var response = {
        version: "1.0",
        response: {
            shouldEndSession: true,
            directives: [{
                type: "AudioPlayer.Play",
                playBehavior: "REPLACE_ALL", // Setting to REPLACE_ALL means that this track will start playing immediately
                audioItem: {
                    stream: {
                        url: audioURL,
                        token: "0", // Unique token for the track - needed when queueing multiple tracks
                        expectedPreviousToken: null, // The expected previous token - when using queues, ensures safety
                        offsetInMilliseconds: offsetInMilliseconds
                    }
                }
            }]
        }
    }

    this.context.succeed(response);
};

Answer 2

以下代码对我有效：

def lambda_handler(event, context):
    return {
        "response": {
            "directives": [
                {
                    "type": "AudioPlayer.Play",
                    "playBehavior": "REPLACE_ALL",
                    "audioItem": {
                        "stream": {
                            "token": "12345",
                            "url": "https://emit-media-production.s3.amazonaws.com/pbs/the-afterglow/2016/08/24/1700/201608241700_the-afterglow_64.m4a",
                            "offsetInMilliseconds": 0
                        }
                    }
                }
            ],
            "shouldEndSession": True
        }
    }
]

唯一的区别是URL是https而不是http。

如果在技能模拟器中不起作用，就不要拖延。还没有升级到流媒体音频。你甚至看不到你的指示。但当它和你的设备一起使用时应该会起作用。

Answer 3

程序应该在“LaunchRequest”和“sessionedrequest”上返回一些响应，否则您将得到“请求的技能repsonse有问题”。

您需要添加意图“播放音乐”并更改文件的url。

p.S.我不确定哪个version应该在build_audio_response函数中，我从here获得了json

def build_audio_response(url):
    return {
        "version": "1.01",
        "response": {
            "directives": [
                {
                    "type": "AudioPlayer.Play",
                    "playBehavior": "REPLACE_ALL",
                    "audioItem": {
                        "stream": {
                            "token": "12345",
                            "url": url,
                            "offsetInMilliseconds": 0
                        }
                    }
                }
            ],
            "shouldEndSession": True
        }
    }

def handle_session_end_request():
    return {
        "version": "1.0",
        "response": {
            "shouldEndSession": True
        }
    }

def play_music(intent, session):
    url = "https://s3-eu-west-1.amazonaws.com/bucket/filename.mp3"
    return build_audio_response(url, should_end_session=True)

def on_intent(intent_request, session):
    """ Called when the user specifies an intent for this skill """

    intent = intent_request['intent']
    intent_name = intent_request['intent']['name']

    if intent_name == "PlayMusic":
        return play_music(intent, session)
    elif intent_name == "AMAZON.CancelIntent" or intent_name == "AMAZON.StopIntent":
        return handle_session_end_request()
    else:
        raise ValueError("Invalid intent")

def lambda_handler(event, context):
    if event['request']['type'] == "LaunchRequest":
        return {
            "version": "1.0",
            "response": {
                "shouldEndSession": False
            }
        }
    elif event['request']['type'] == "IntentRequest":
        return on_intent(event['request'], event['session'])
    elif event['request']['type'] == "SessionEndedRequest":
        return handle_session_end_request()