获取下载网址YouTube的视频（安卓/ JAVA） [英] Get the download URL for YouTube video (Android/Java)

问题描述

如何获得的URL下载YouTube视频在Android上使用Java？

How to get the URL to download a YouTube video on Android in Java?

推荐答案

这是我的Java / Android的实现检索YouTube视频的下载网址。不过已经有了大量的职位在这里和网络，但大多数人似乎损坏或没有在Java中。这是工作为3月6日2013年以下是Android的code提取可用流的URI并返回最符合以下顺序之一：

This is my implementation in Java/Android for retrieving the download URL of a YouTube video. There's already a plethora of posts on here and the web but most of them seem broken or weren't in Java. This is working as of 6th March 2013. The following is Android code to extract the available streaming URIs and return the one that best matches the following order:

MP4中等质量 - > 3GP中等质量 - > MP4素质低 - > 3gp低质量

mp4 medium quality -> 3gp medium quality -> mp4 low quality -> 3gp low quality

还有其他地方，你想要做的URL（下载/流等。）什么code。

There's code elsewhere for what you want to do with the URL (download/stream etc.).

new YouTubePageStreamUriGetter().execute("https://www.youtube.com/watch?v=4GuqB1BQVr4");

class Meta {
    public String num;
    public String type;
    public String ext;

    Meta(String num, String ext, String type) {
        this.num = num;
        this.ext = ext;
        this.type = type;
    }
}

class Video {
    public String ext = "";
    public String type = "";
    public String url = "";

    Video(String ext, String type, String url) {
        this.ext = ext;
        this.type = type;
        this.url = url;
    }
}

public ArrayList<Video> getStreamingUrisFromYouTubePage(String ytUrl)
        throws IOException {
    if (ytUrl == null) {
        return null;
    }

    // Remove any query params in query string after the watch?v=<vid> in
    // e.g.
    // http://www.youtube.com/watch?v=0RUPACpf8Vs&feature=youtube_gdata_player
    int andIdx = ytUrl.indexOf('&');
    if (andIdx >= 0) {
        ytUrl = ytUrl.substring(0, andIdx);
    }

    // Get the HTML response
    String userAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0.1)";
    HttpClient client = new DefaultHttpClient();
    client.getParams().setParameter(CoreProtocolPNames.USER_AGENT,
            userAgent);
    HttpGet request = new HttpGet(ytUrl);
    HttpResponse response = client.execute(request);
    String html = "";
    InputStream in = response.getEntity().getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    StringBuilder str = new StringBuilder();
    String line = null;
    while ((line = reader.readLine()) != null) {
        str.append(line.replace("\\u0026", "&"));
    }
    in.close();
    html = str.toString();

    // Parse the HTML response and extract the streaming URIs
    if (html.contains("verify-age-thumb")) {
        CLog.w("YouTube is asking for age verification. We can't handle that sorry.");
        return null;
    }

    if (html.contains("das_captcha")) {
        CLog.w("Captcha found, please try with different IP address.");
        return null;
    }

    Pattern p = Pattern.compile("stream_map\": \"(.*?)?\"");
    // Pattern p = Pattern.compile("/stream_map=(.[^&]*?)\"/");
    Matcher m = p.matcher(html);
    List<String> matches = new ArrayList<String>();
    while (m.find()) {
        matches.add(m.group());
    }

    if (matches.size() != 1) {
        CLog.w("Found zero or too many stream maps.");
        return null;
    }

    String urls[] = matches.get(0).split(",");
    HashMap<String, String> foundArray = new HashMap<String, String>();
    for (String ppUrl : urls) {
        String url = URLDecoder.decode(ppUrl, "UTF-8");

        Pattern p1 = Pattern.compile("itag=([0-9]+?)[&]");
        Matcher m1 = p1.matcher(url);
        String itag = null;
        if (m1.find()) {
            itag = m1.group(1);
        }

        Pattern p2 = Pattern.compile("sig=(.*?)[&]");
        Matcher m2 = p2.matcher(url);
        String sig = null;
        if (m2.find()) {
            sig = m2.group(1);
        }

        Pattern p3 = Pattern.compile("url=(.*?)[&]");
        Matcher m3 = p3.matcher(ppUrl);
        String um = null;
        if (m3.find()) {
            um = m3.group(1);
        }

        if (itag != null && sig != null && um != null) {
            foundArray.put(itag, URLDecoder.decode(um, "UTF-8") + "&"
                    + "signature=" + sig);
        }
    }

    if (foundArray.size() == 0) {
        CLog.w("Couldn't find any URLs and corresponding signatures");
        return null;
    }

    HashMap<String, Meta> typeMap = new HashMap<String, Meta>();
    typeMap.put("13", new Meta("13", "3GP", "Low Quality - 176x144"));
    typeMap.put("17", new Meta("17", "3GP", "Medium Quality - 176x144"));
    typeMap.put("36", new Meta("36", "3GP", "High Quality - 320x240"));
    typeMap.put("5", new Meta("5", "FLV", "Low Quality - 400x226"));
    typeMap.put("6", new Meta("6", "FLV", "Medium Quality - 640x360"));
    typeMap.put("34", new Meta("34", "FLV", "Medium Quality - 640x360"));
    typeMap.put("35", new Meta("35", "FLV", "High Quality - 854x480"));
    typeMap.put("43", new Meta("43", "WEBM", "Low Quality - 640x360"));
    typeMap.put("44", new Meta("44", "WEBM", "Medium Quality - 854x480"));
    typeMap.put("45", new Meta("45", "WEBM", "High Quality - 1280x720"));
    typeMap.put("18", new Meta("18", "MP4", "Medium Quality - 480x360"));
    typeMap.put("22", new Meta("22", "MP4", "High Quality - 1280x720"));
    typeMap.put("37", new Meta("37", "MP4", "High Quality - 1920x1080"));
    typeMap.put("33", new Meta("38", "MP4", "High Quality - 4096x230"));

    ArrayList<Video> videos = new ArrayList<ARViewer.Video>();

    for (String format : typeMap.keySet()) {
        Meta meta = typeMap.get(format);

        if (foundArray.containsKey(format)) {
            Video newVideo = new Video(meta.ext, meta.type,
                    foundArray.get(format));
            videos.add(newVideo);
            CLog.d("YouTube Video streaming details: ext:" + newVideo.ext
                    + ", type:" + newVideo.type + ", url:" + newVideo.url);
        }
    }

    return videos;
}

private class YouTubePageStreamUriGetter extends
        AsyncTask<String, String, String> {
    ProgressDialog progressDialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = ProgressDialog.show(ARViewer.this, "",
                "Connecting to YouTube...", true);
    }

    @Override
    protected String doInBackground(String... params) {
        String url = params[0];
        try {
            ArrayList<Video> videos = getStreamingUrisFromYouTubePage(url);
            if (videos != null && !videos.isEmpty()) {
                String retVidUrl = null;
                for (Video video : videos) {
                    if (video.ext.toLowerCase().contains("mp4")
                            && video.type.toLowerCase().contains("medium")) {
                        retVidUrl = video.url;
                        break;
                    }
                }
                if (retVidUrl == null) {
                    for (Video video : videos) {
                        if (video.ext.toLowerCase().contains("3gp")
                                && video.type.toLowerCase().contains(
                                        "medium")) {
                            retVidUrl = video.url;
                            break;

                        }
                    }
                }
                if (retVidUrl == null) {

                    for (Video video : videos) {
                        if (video.ext.toLowerCase().contains("mp4")
                                && video.type.toLowerCase().contains("low")) {
                            retVidUrl = video.url;
                            break;

                        }
                    }
                }
                if (retVidUrl == null) {
                    for (Video video : videos) {
                        if (video.ext.toLowerCase().contains("3gp")
                                && video.type.toLowerCase().contains("low")) {
                            retVidUrl = video.url;
                            break;
                        }
                    }
                }

                return retVidUrl;
            }
        } catch (Exception e) {
            CLog.e("Couldn't get YouTube streaming URL", e);
        }
        CLog.w("Couldn't get stream URI for " + url);
        return null;
    }

    @Override
    protected void onPostExecute(String streamingUrl) {
        super.onPostExecute(streamingUrl);
        progressDialog.dismiss();
        if (streamingUrl != null) {
                         /* Do what ever you want with streamUrl */
        }
    }
}

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