从Android应用程序打开Chromecast youtube视频
我创建了一个应用，其中有一个带有youtube链接的列表视图.现在，我想使用Chrome Cast播放这些视频.我遵循了官方文档，并且能够播放具有直接mp4链接的其他视频，但不适用于youtube链接.
I created an app in which there is a list view with youtube links. Now I want to play these videos using chrome cast. I followed the official documentation and I am able to play other videos with direct mp4 link, but its not working for youtube links.
其他链接当然都直接连接到视频(以* .mp4结尾)，但是如何添加带有youtube链接的媒体?我需要以某种方式创建带有youtube链接的MediaInfo对象，但我不知道该怎么做，甚至可能.
Of course the other links are directly connected to a video (ending *.mp4), but how can i add a media with a youtube link? Somehow I need to create a MediaInfo object with youtube link, but I don't know how to do that or is it even possible.
我已找到此信息
MimeData数据=新的MimeData("v = g1LsT1PVjUA"，MimeData.TYPE_TEXT); mSession.startSession("YouTube"，数据);
MimeData data = new MimeData("v=g1LsT1PVjUA", MimeData.TYPE_TEXT); mSession.startSession("YouTube", data);
从我的Android应用中打开Chromecast YouTube视频
但是我不确定如何获取会话并将其加载到youtube会话中.如果有人可以帮助我，我将不胜感激.
But I am not sure how to get the session and load it with youtube session. I would appreciate if someone can help me with this.
感谢您的帮助
我去年编写了一个Android应用，该应用可以在连接到大屏幕电视的VLC上播放YouTube/本地媒体.它的表现非常好，但是我一直想用更优雅的东西代替VLC笔记本电脑.当Chromecast最终与官方SDK一起发布时，我感到非常兴奋.在尝试启动YouTube接收器应用程序播放YouTube视频时，我也遇到了同样的问题，因此我决定深入研究VLC如何做到这一点(开源很棒:))我发现YouTube视频ID只是一个JavaScript页面中嵌入了很多东西.诀窍是从中提取正确的信息.不幸的是，VLC脚本是用Lua编写的，所以我花了几周的时间学习足够的Lua来浏览Lua脚本.您可以在youtube.lua上搜索该脚本的源代码.
I wrote an Android app that plays YouTube/Local media on VLC attached to a big screen TV last year. It was playing very nice but I always want to replace the VLC laptop with something more elegant. I was really excited when Chromecast was finally released with an official SDK. I too ran into the same problem when trying to launch YouTube receiver app to play YouTube video so I decided to delve into how VLC was able to do that (Is open source great :)) I found out that the YouTube video ID is just a JavaScript page with lots of stuff embedded inside. The trick is to pull out the correct info from it. Unfortunately, the VLC script is written in Lua so I spent a couple weeks learning enough Lua to navigate my way around the Lua script. You can google youtube.lua for the source code of the script.
我用Java重写了脚本，并且能够修改CastVideos Android以轻松播放YouTube视频.请注意，由于Chromecast只能播放mp4视频容器格式，因此其他格式的视频可能无法播放.
I rewrote the script in Java and was able to modify CastVideos Android to play YouTube video at ease. Note that since Chromecast can only play mp4 video container format, video in other format may not play.
如果有人感兴趣，这是我的测试代码.您可以使用CastHelloVideo-chrome加载自定义媒体来测试网址.
Here is my test code if anyone is interested. You can test the URL using CastHelloVideo-chrome load custom media.
享受，
Danh
package com.dql.urlexplorer;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class UrlExplore {
private static final String URL_ENCODED_STREAM_MAP = "\"url_encoded_fmt_stream_map\":";
private static final String VIDEO_TITLE_KEYWORD = "<meta name=\"title\"";
private static final String VIDEO_DESCRIPTION_KEYWORD = "<meta name=\"description\"";
private static final String VIDEO_THUMBNAIL_KEYWORD = "<meta property=\"og:image\"" ;
private static final String CONTENT_VALUE_KEYWORD = "content=\"";
//private static final String TEST_URL = "http://www.youtube.com/watch?v=JtyCM4BTbYo";
private static final String YT_UTRL_PREFIX = "http://www.youtube.com/watch?v=";
public static void main(String[] args) throws IOException {
while (true) {
String videoId = getVideoIdFromUser();
String urlSite = YT_UTRL_PREFIX + videoId;
System.out.println("URL = " + urlSite);
System.out.println("===============================================================");
System.out.println("Getting video site content");
System.out.println("===============================================================");
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpGet httpget = new HttpGet(urlSite);
System.out.println("Executing request " + httpget.getRequestLine());
// Create a custom response handler
ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
public String handleResponse(
final HttpResponse response) throws ClientProtocolException, IOException {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
}
};
String responseBody = httpclient.execute(httpget, responseHandler);
if (responseBody.contains(VIDEO_TITLE_KEYWORD)) {
// video title
int titleStart = responseBody.indexOf(VIDEO_TITLE_KEYWORD);
StringBuilder title = new StringBuilder();
char ch;
do {
ch = responseBody.charAt(titleStart++);
title.append(ch);
}
while (ch != '>');
String videoTitle = getKeyContentValue(title.toString());
System.out.println("Video Title = " + videoTitle);
}
if (responseBody.contains(VIDEO_DESCRIPTION_KEYWORD)) {
// video description
int descStart = responseBody.indexOf(VIDEO_DESCRIPTION_KEYWORD);
StringBuilder desc = new StringBuilder();
char ch;
do {
ch = responseBody.charAt(descStart++);
desc.append(ch);
}
while (ch != '>');
String videoDesc = getKeyContentValue(desc.toString());
System.out.println("Video Description = " + videoDesc);
}
if (responseBody.contains(VIDEO_THUMBNAIL_KEYWORD)) {
// video thumbnail
int thumbnailStart = responseBody.indexOf(VIDEO_THUMBNAIL_KEYWORD);
StringBuilder thumbnailURL = new StringBuilder();
char ch;
do {
ch = responseBody.charAt(thumbnailStart++);
thumbnailURL.append(ch);
}
while (ch != '>');
String videoThumbnail= getKeyContentValue(thumbnailURL.toString());
System.out.println("Video Thumbnail = " + videoThumbnail);
}
if (responseBody.contains(URL_ENCODED_STREAM_MAP)) {
// find the string we are looking for
int start = responseBody.indexOf(URL_ENCODED_STREAM_MAP) + URL_ENCODED_STREAM_MAP.length() + 1; // is the opening "
String urlMap = responseBody.substring(start);
int end = urlMap.indexOf("\"");
if (end > 0) {
urlMap = urlMap.substring(0, end);
}
String path = getURLEncodedStream(urlMap);
System.out.println("Video URL = " + path);
}
}
finally {
httpclient.close();
}
System.out.println( "===============================================================");
System.out.println("Done: ");
System.out.println("===============================================================");
}
}
static String getURLEncodedStream(String stream) throws UnsupportedEncodingException {
// replace all the \u0026 with &
String str = stream.replace("\\u0026", "&");
//str = java.net.URLDecoder.decode(stream, "UTF-8");
//System.out.println("Raw URL map = " + str);
String urlMap = str.substring(str.indexOf("url=http") + 4);
// search urlMap until we see either a & or ,
StringBuilder sb = new StringBuilder();
for (int i = 0; i < urlMap.length(); i++) {
if ((urlMap.charAt(i) == '&') || (urlMap.charAt(i) == ','))
break;
else
sb.append(urlMap.charAt(i));
}
//System.out.println(java.net.URLDecoder.decode(sb.toString(),"UTF-8"));
return java.net.URLDecoder.decode(sb.toString(),"UTF-8");
}
static String getKeyContentValue(String str) {
StringBuilder contentStr = new StringBuilder();
int contentStart = str.indexOf(CONTENT_VALUE_KEYWORD) + CONTENT_VALUE_KEYWORD.length();
if (contentStart > 0) {
char ch;
while (true) {
ch = str.charAt(contentStart++);
if (ch == '\"')
break;
contentStr.append(ch);
}
}
try {
return java.net.URLDecoder.decode(contentStr.toString(),"UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/*
* Prompt the user to enter a video ID.
*/
private static String getVideoIdFromUser() throws IOException {
String videoId = "";
System.out.print("Please enter a YouTube video Id: ");
BufferedReader bReader = new BufferedReader(new InputStreamReader(System.in));
videoId = bReader.readLine();
if (videoId.length() < 1) {
// Exit if the user doesn't provide a value.
System.out.print("Video Id can't be empty! Exiting program");
System.exit(1);
}
return videoId;
}
}`enter code here`