Youtube 数据 API : 获取媒体流和播放 (JAVA)
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【中文标题】Youtube 数据 API : 获取媒体流和播放 (JAVA)【英文标题】：Youtube data API : Get access to media stream and play (JAVA) 【发布时间】：2011-06-09 17:07:07 【问题描述】：我想访问 youtube 视频并使用我自己的媒体播放器播放。我可以使用 youtube 数据 API 获取视频属性（标题、网址等）。我可以访问视频流并使用我自己的媒体播放器（如 android 媒体播放器）来播放它吗？ 我正在 JAVA 中尝试所有这些。
提前谢谢.. :)
【问题讨论】：
@Nishant 是否值得为这个微不足道的修正发表评论？ 【参考方案1】：你不能。在此处查看有关 API 可以处理的内容的进一步阅读： YoutubeAPI 如果您可以在上面获得 InputStream，Google 根本不会获得任何广告费用。 但是您可以解析从 API 获得的视频 URL 的页面，并在 Flash 标签中查找真正的视频链接。
【讨论】：
【参考方案2】：/**
* This work is licensed under a Creative Commons Attribution 3.0 Unported
* License (http://creativecommons.org/licenses/by/3.0/). This work is placed
* into the public domain by the author.
*/
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.net.URI;
import java.net.URISyntaxException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import java.util.regex.Pattern;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.CookieStore;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
/**
* Locally download a YouTube.com video.
*/
public class JavaYoutubeDownloader extends Formatter
private static final String scheme = "http";
private static final String host = "www.youtube.com";
private static final String YOUTUBE_WATCH_URL_PREFIX = scheme + "://" + host + "/watch?v=";
private static final String ERROR_MISSING_VIDEO_ID = "Missing video id. Extract from " + YOUTUBE_WATCH_URL_PREFIX + "VIDEO_ID";
private static final String DEFAULT_USER_AGENT = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13";
private static final String DEFAULT_ENCODING = "UTF-8";
private static final String newline = System.getProperty("line.separator");
private static final Logger log = Logger.getLogger(JavaYoutubeDownloader.class.getCanonicalName());
private static final Logger rootlog = Logger.getLogger("");
private static final Pattern commaPattern = Pattern.compile(",");
private static final Pattern pipePattern = Pattern.compile("\\|");
private static final char[] ILLEGAL_FILENAME_CHARACTERS = '/', '\n', '\r', '\t', '\0', '\f', '`', '?', '*', '\\', '<', '>', '|', '\"', ':' ;
private static final int BUFFER_SIZE = 2048;
private static final DecimalFormat commaFormatNoPrecision = new DecimalFormat("###,###");
private static final double ONE_HUNDRED = 100;
private static final double KB = 1024;
private void usage(String error)
if (error != null)
System.err.println("Error: " + error);
System.err.println("usage: JavaYoutubeDownload VIDEO_ID");
System.err.println();
System.err.println("Options:");
System.err.println("\t[-dir DESTINATION_DIR] - Specify output directory.");
System.err.println("\t[-format FORMAT] - Format number" + newline + "\t\tSee http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs");
System.err.println("\t[-ua USER_AGENT] - Emulate a browser user agent.");
System.err.println("\t[-enc ENCODING] - Default character encoding.");
System.err.println("\t[-verbose] - Verbose logging for downloader component.");
System.err.println("\t[-verboseall] - Verbose logging for all components (e.g. HttpClient).");
System.exit(-1);
public static void main(String[] args)
try
new JavaYoutubeDownloader().run(args);
catch (Throwable t)
t.printStackTrace();
private void run(String[] args) throws Throwable
setupLogging(Level.WARNING, Level.WARNING);
String videoId = null;
String outdir = ".";
int format = 18;
String encoding = DEFAULT_ENCODING;
String userAgent = DEFAULT_USER_AGENT;
for (int i = 0; i < args.length; i++)
String arg = args[i];
// Options start with either -, --
// Do not accept Windows-style args that start with / because of abs
// paths on linux for file names.
if (arg.charAt(0) == '-')
// For easier processing, convert any double dashes to
// single dashes
if (arg.length() > 1 && arg.charAt(1) == '-')
arg = arg.substring(1);
String larg = arg.toLowerCase();
// Process the option
if (larg.equals("-help") || larg.equals("-?") || larg.equals("-usage") || larg.equals("-h"))
usage(null);
else if (larg.equals("-verbose"))
setupLogging(Level.ALL, Level.WARNING);
else if (larg.equals("-verboseall"))
setupLogging(Level.ALL, Level.ALL);
else if (larg.equals("-dir"))
outdir = args[++i];
else if (larg.equals("-format"))
format = Integer.parseInt(args[++i]);
else if (larg.equals("-ua"))
userAgent = args[++i];
else if (larg.equals("-enc"))
encoding = args[++i];
else
usage("Unknown command line option " + args[i]);
else
// Non-option (i.e. does not start with -, --
videoId = arg;
// Break if only the first non-option should be used.
break;
if (videoId == null)
usage(ERROR_MISSING_VIDEO_ID);
log.fine("Starting");
if (videoId.startsWith(YOUTUBE_WATCH_URL_PREFIX))
videoId = videoId.substring(YOUTUBE_WATCH_URL_PREFIX.length());
int a = videoId.indexOf('&');
if (a != -1)
videoId = videoId.substring(0, a);
File outputDir = new File(outdir);
String extension = getExtension(format);
play(videoId, format, encoding, userAgent, outputDir, extension);
log.fine("Finished");
private static String getExtension(int format)
switch (format)
case 18:
return "mp4";
default:
throw new Error("Unsupported format " + format);
private static void play(String videoId, int format, String encoding, String userAgent, File outputdir, String extension) throws Throwable
log.fine("Retrieving " + videoId);
List<NameValuePair> qparams = new ArrayList<NameValuePair>();
qparams.add(new BasicNameValuePair("video_id", videoId));
qparams.add(new BasicNameValuePair("fmt", "" + format));
URI uri = getUri("get_video_info", qparams);
CookieStore cookieStore = new BasicCookieStore();
HttpContext localContext = new BasicHttpContext();
localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(uri);
if (userAgent != null && userAgent.length() > 0)
httpget.setHeader("User-Agent", userAgent);
log.finer("Executing " + uri);
HttpResponse response = httpclient.execute(httpget, localContext);
HttpEntity entity = response.getEntity();
if (entity != null && response.getStatusLine().getStatusCode() == 200)
InputStream instream = entity.getContent();
String videoInfo = getStringFromInputStream(encoding, instream);
if (videoInfo != null && videoInfo.length() > 0)
List<NameValuePair> infoMap = new ArrayList<NameValuePair>();
URLEncodedUtils.parse(infoMap, new Scanner(videoInfo), encoding);
String downloadUrl = null;
String filename = videoId;
for (NameValuePair pair : infoMap)
String key = pair.getName();
String val = pair.getValue();
log.finest(key + "=" + val);
if (key.equals("title"))
filename = val;
else if (key.equals("fmt_url_map"))
String[] formats = commaPattern.split(val);
boolean found = false;
for (String fmt : formats)
String[] fmtPieces = pipePattern.split(fmt);
if (fmtPieces.length == 2)
int pieceFormat = Integer.parseInt(fmtPieces[0]);
log.fine("Available format=" + pieceFormat);
if (pieceFormat == format)
// found what we want
downloadUrl = fmtPieces[1];
found = true;
break;
if (!found)
log.warning("Could not find video matching specified format, however some formats of the video do exist (use -verbose).");
filename = cleanFilename(filename);
if (filename.length() == 0)
filename = videoId;
else
filename += "_" + videoId;
filename += "." + extension;
File outputfile = new File(outputdir, filename);
if (downloadUrl != null)
downloadWithHttpClient(userAgent, downloadUrl, outputfile);
else
log.severe("Could not find video");
else
log.severe("Did not receive content from youtube");
else
log.severe("Could not contact youtube: " + response.getStatusLine());
private static void downloadWithHttpClient(String userAgent, String downloadUrl, File outputfile) throws Throwable
HttpGet httpget2 = new HttpGet(downloadUrl);
if (userAgent != null && userAgent.length() > 0)
httpget2.setHeader("User-Agent", userAgent);
log.finer("Executing " + httpget2.getURI());
HttpClient httpclient2 = new DefaultHttpClient();
HttpResponse response2 = httpclient2.execute(httpget2);
HttpEntity entity2 = response2.getEntity();
if (entity2 != null && response2.getStatusLine().getStatusCode() == 200)
double length = entity2.getContentLength();
if (length <= 0)
// Unexpected, but do not divide by zero
length = 1;
InputStream instream2 = entity2.getContent();
System.out.println("Writing " + commaFormatNoPrecision.format(length) + " bytes to " + outputfile);
if (outputfile.exists())
outputfile.delete();
FileOutputStream outstream = new FileOutputStream(outputfile);
try
byte[] buffer = new byte[BUFFER_SIZE];
double total = 0;
int count = -1;
int progress = 10;
long start = System.currentTimeMillis();
while ((count = instream2.read(buffer)) != -1)
total += count;
int p = (int) ((total / length) * ONE_HUNDRED);
if (p >= progress)
long now = System.currentTimeMillis();
double s = (now - start) / 1000;
int kbpers = (int) ((total / KB) / s);
System.out.println(progress + "% (" + kbpers + "KB/s)");
progress += 10;
outstream.write(buffer, 0, count);
outstream.flush();
finally
outstream.close();
System.out.println("Done");
private static String cleanFilename(String filename)
for (char c : ILLEGAL_FILENAME_CHARACTERS)
filename = filename.replace(c, '_');
return filename;
private static URI getUri(String path, List<NameValuePair> qparams) throws URISyntaxException
URI uri = URIUtils.createURI(scheme, host, -1, "/" + path, URLEncodedUtils.format(qparams, DEFAULT_ENCODING), null);
return uri;
private void setupLogging(Level myLevel, Level globalLevel)
changeFormatter(this);
explicitlySetAllLogging(myLevel, globalLevel);
@Override
public String format(LogRecord arg0)
return arg0.getMessage() + newline;
private static void changeFormatter(Formatter formatter)
Handler[] handlers = rootlog.getHandlers();
for (Handler handler : handlers)
handler.setFormatter(formatter);
private static void explicitlySetAllLogging(Level myLevel, Level globalLevel)
rootlog.setLevel(Level.ALL);
for (Handler handler : rootlog.getHandlers())
handler.setLevel(Level.ALL);
log.setLevel(myLevel);
rootlog.setLevel(globalLevel);
private static String getStringFromInputStream(String encoding, InputStream instream) throws UnsupportedEncodingException, IOException
Writer writer = new StringWriter();
char[] buffer = new char[1024];
try
Reader reader = new BufferedReader(new InputStreamReader(instream, encoding));
int n;
while ((n = reader.read(buffer)) != -1)
writer.write(buffer, 0, n);
finally
instream.close();
String result = writer.toString();
return result;
/**
* <pre>
* Exploded results from get_video_info:
*
* fexp=909302
* allow_embed=1
* fmt_stream_map=35|http://v9.lscache8.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=35&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=9E0A8E67154145BCADEBCF844CC155282548288F.2BBD0B2E125E3E533D07866C7AE91B38DD625D30&factor=1.25&id=4ba2193f7c9127d2||tc.v9.cache8.c.youtube.com,34|http://v6.lscache3.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=34&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=6726793A7B041E6456B52C0972596D0D58974141.42B5A0573F62B85AEA7979E5EE1ADDD47EB9E909&factor=1.25&id=4ba2193f7c9127d2||tc.v6.cache3.c.youtube.com,18|http://v12.lscache7.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=18&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=AE58398D4CC4D760C682D2A5B670B4047777FFF0.952E4FC4554E786FD937E7A89140E1F79B6DD8B7&factor=1.25&id=4ba2193f7c9127d2||tc.v12.cache7.c.youtube.com,5|http://v1.lscache7.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=5&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=43434DCB6CFC463FF4522D9EE7CD019FE47237B1.C60A9522E361130938663AF2DAD83A5C2821AF5C&factor=1.25&id=4ba2193f7c9127d2||tc.v1.cache7.c.youtube.com
* fmt_url_map=35|http://v9.lscache8.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=35&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=9E0A8E67154145BCADEBCF844CC155282548288F.2BBD0B2E125E3E533D07866C7AE91B38DD625D30&factor=1.25&id=4ba2193f7c9127d2,34|http://v6.lscache3.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=34&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=6726793A7B041E6456B52C0972596D0D58974141.42B5A0573F62B85AEA7979E5EE1ADDD47EB9E909&factor=1.25&id=4ba2193f7c9127d2,18|http://v12.lscache7.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=18&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=AE58398D4CC4D760C682D2A5B670B4047777FFF0.952E4FC4554E786FD937E7A89140E1F79B6DD8B7&factor=1.25&id=4ba2193f7c9127d2,5|http://v1.lscache7.c.youtube.com/videoplayback?ip=174.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor&fexp=909302&algorithm=throttle-factor&itag=5&ipbits=8&burst=40&sver=3&expire=1294549200&key=yt1&signature=43434DCB6CFC463FF4522D9EE7CD019FE47237B1.C60A9522E361130938663AF2DAD83A5C2821AF5C&factor=1.25&id=4ba2193f7c9127d2
* allow_ratings=1
* keywords=Stefan Molyneux,Luke Bessey,anarchy,stateless society,giant stone cow,the story of our unenslavement,market anarchy,voluntaryism,anarcho capitalism
* track_embed=0
* fmt_list=35/854x480/9/0/115,34/640x360/9/0/115,18/640x360/9/0/115,5/320x240/7/0/0
* author=lukebessey
* muted=0
* length_seconds=390
* plid=AASZXXGQtTEDKwAw
* ftoken=null
* status=ok
* watermark=http://s.ytimg.com/yt/swf/logo-vfl_bP6ud.swf,http://s.ytimg.com/yt/swf/hdlogo-vfloR6wva.swf
* timestamp=1294526523
* has_cc=False
* fmt_map=35/854x480/9/0/115,34/640x360/9/0/115,18/640x360/9/0/115,5/320x240/7/0/0
* leanback_module=http://s.ytimg.com/yt/swfbin/leanback_module-vflJYyeZN.swf
* hl=en_US
* endscreen_module=http://s.ytimg.com/yt/swfbin/endscreen-vflk19iTq.swf
* vq=auto
* avg_rating=5.0
* video_id=S6IZP3yRJ9I
* token=vjVQa1PpcFNhI3jvw6hfEHivcKK-XY5gb-iszDMrooA=
* thumbnail_url=http://i4.ytimg.com/vi/S6IZP3yRJ9I/default.jpg
* title=The Story of Our Unenslavement - Animated
* </pre>
*/
【讨论】：
【参考方案3】：现在您可以在这里找到它，它现在可用https://developers.google.com/youtube/android/player/sample-applications
【讨论】：
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