How to add multiple track to stream in alexa? - php

Question

I am working on alexa for the first time and I am developing a music app. I need to add multiple track of one artist and play it continuously. I am unable to do so. However, one song is working properly but unable to add and play multiple song.
Here is my code,
$response = '{
"version" : "1.0",
"response" : {
"outputSpeech": {
"type": "PlainText",
"text": "Playing song for Acon"
},
'.$card.',
"directives": [
{
"type": "AudioPlayer.Play",
"playBehavior": "REPLACE_ALL",
"audioItem": {
"stream": {
"token": "track1",
"url": "https://p.scdn.co/mp3-preview/9153bcc4d7bef50eb80a809fa34e694f2854e539?cid=null",
"offsetInMilliseconds": 0
}
}
}
],
"shouldEndSession" : true
}
}';

Answer 1

You need to wait for the AudioPlayer.PlaybackNearlyFinished request from Alexa. At that point, you can enqueue the next track to be played. It will come near the conclusion of the playback of the currently playing track.
Information on it is here:
https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/custom-audioplayer-interface-reference#playbacknearlyfinished-request
When replying with a directive to PlaybackNearlyFinished, be sure that:
You set the playBehavior to ENQUEUE
This will cause the next track to start after the current one finishes
You do NOT include the outputSpeech field
outputSpeech is not allowed when out of session. The session ends when the first stream begins playback.
This blog post that I wrote goes into more detail on approaches to developing and testing for the AudioPlayer interface:
https://bespoken.tools/blog/2016/10/10/unit-testing-alexa-skills

Answer 2

Follow the above doc:
https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/custom-audioplayer-interface-reference#playbacknearlyfinished-request
and then do this to enqueue the second song
In PHP, the way you are handling other requests, you can handle AudioRequest too. For example.
$data = file_get_contents("php://input");
$jsonData = json_decode($data);
if($jsonData->request->type === "AudioPlayer.PlaybackNearlyFinished")
{
$response = '{
"version" : "1.0",
"response" : {
"directives": [
{
"type": "AudioPlayer.Play",
"playBehavior": "ENQUEUE",
"audioItem": {
"stream": {
"token": "track2",
"expectedPreviousToken": "track1",
"url": "Your URL",
"offsetInMilliseconds": 3
}
}
}
],
"shouldEndSession" : true
}
}';
echo $response;
}
This is the way you can handle all the AudioRequest.