我想做一个使用AcoustID API的Android应用程序。从我的理解，这是一个c++ API，我应该使用Android NDK。奇怪的是，我发现了一个用Java编写的API样本，我不知道这是否实际上是AcoustID API或一些改编。
另外，如果使用AcoustID意味着我必须使用NDK，我想知道是否有Java替代方案。我找不到令人满意的结果。
这是我找到的Java示例:
package net.filebot.web;
import static java.util.Collections.*;
import static net.filebot.util.FileUtilities.*;
import static net.filebot.web.WebRequest.*;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.ProcessBuilder.Redirect;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.Icon;
import net.filebot.Cache;
import net.filebot.ResourceManager;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class AcoustIDClient implements MusicIdentificationService {
private static final FloodLimit REQUEST_LIMIT = new FloodLimit(3, 1, TimeUnit.SECONDS);
private String apikey;
public AcoustIDClient(String apikey) {
this.apikey = apikey;
}
@Override
public String getName() {
return "AcoustID";
}
@Override
public Icon getIcon() {
return ResourceManager.getIcon("search.acoustid");
}
@Override
public Map<File, AudioTrack> lookup(Iterable<File> files) throws Exception {
Map<File, AudioTrack> results = new LinkedHashMap<File, AudioTrack>();
for (Map<String, String> fp : fpcalc(files)) {
results.put(new File(fp.get("FILE")), parse(lookup(fp.get("DURATION"), fp.get("FINGERPRINT"))));
}
return results;
}
public String lookup(File file) throws Exception {
Map<String, String> fp = fpcalc(singleton(file)).get(0);
return lookup(fp.get("DURATION"), fp.get("FINGERPRINT"));
}
public String lookup(String duration, String fingerprint) throws IOException, InterruptedException, ParseException {
// http://api.acoustid.org/v2/lookup?client=8XaBELgH&meta=recordings+releasegroups+compress&duration=641&fingerprint=AQABz0qUkZK4oOfhL-CPc4e5C_wW2H2QH9uDL4cvoT8UNQ-eHtsE8cceeFJx-LiiHT-aPzhxoc-Opj_eI5d2hOFyMJRzfDk-QSsu7fBxqZDMHcfxPfDIoPWxv9C1o3yg44d_3Df2GJaUQeeR-cb2HfaPNsdxHj2PJnpwPMN3aPcEMzd-_MeB_Ej4D_CLP8ghHjkJv_jh_UDuQ8xnILwunPg6hF2R8HgzvLhxHVYP_ziJX0eKPnIE1UePMByDJyg7wz_6yELsB8n4oDmDa0Gv40hf6D3CE3_wH6HFaxCPUD9-hNeF5MfWEP3SCGym4-SxnXiGs0mRjEXD6fgl4LmKWrSChzzC33ge9PB3otyJMk-IVC6R8MTNwD9qKQ_CC8kPv4THzEGZS8GPI3x0iGVUxC1hRSizC5VzoamYDi-uR7iKPhGSI82PkiWeB_eHijvsaIWfBCWH5AjjCfVxZ1TQ3CvCTclGnEMfHbnZFA8pjD6KXwd__Cn-Y8e_I9cq6CR-4S9KLXqQcsxxoWh3eMxiHI6TIzyPv0M43YHz4yte-Cv-4D16Hv9F9C9SPUdyGtZRHV-OHEeeGD--BKcjVLOK_NCDXMfx44dzHEiOZ0Z44Rf6DH5R3uiPj4d_PKolJNyRJzyu4_CTD2WOvzjKH9GPb4cUP1Av9EuQd8fGCFee4JlRHi18xQh96NLxkCgfWFKOH6WGeoe4I3za4c5hTscTPEZTES1x8kE-9MQPjT8a8gh5fPgQZtqCFj9MDvp6fDx6NCd07bjx7MLR9AhtnFnQ70GjOcV0opmm4zpY3SOa7HiwdTtyHa6NC4e-HN-OfC5-OP_gLe2QDxfUCz_0w9l65HiPAz9-IaGOUA7-4MZ5CWFOlIfe4yUa6AiZGxf6w0fFxsjTOdC6Itbh4mGD63iPH9-RFy909XAMj7mC5_BvlDyO6kGTZKJxHUd4NDwuZUffw_5RMsde5CWkJAgXnDReNEaP6DTOQ65yaD88HoeX8fge-DSeHo9Qa8cTHc80I-_RoHxx_UHeBxrJw62Q34Kd7MEfpCcu6BLeB1ePw6OO4sOF_sHhmB504WWDZiEu8sKPpkcfCT9xfej0o0lr4T5yNJeOvjmu40w-TDmqHXmYgfFhFy_M7tD1o0cO_B2ms2j-ACEEQgQgAIwzTgAGmBIKIImNQAABwgQATAlhDGCCEIGIIM4BaBgwQBogEBIOESEIA8ARI5xAhxEFmAGAMCKAURKQQpQzRAAkCCBQEAKkQYIYIQQxCixCDADCABMAE0gpJIgyxhEDiCKCCIGAEIgJIQByAhFgGACCACMRQEyBAoxQiHiCBCFOECQFAIgAABR2QAgFjCDMA0AUMIoAIMChQghChASGEGeYEAIAIhgBSErnJPPEGWYAMgw05AhiiGHiBBBGGSCQcQgwRYJwhDDhgCSCSSEIQYwILoyAjAIigBFEUQK8gAYAQ5BCAAjkjCCAEEMZAUQAZQCjCCkpCgFMCCiIcVIAZZgilAQAiSHQECOcQAQIc4QClAHAjDDGkAGAMUoBgyhihgEChFCAAWEIEYwIJYwViAAlHCBIGEIEAEIQAoBwwgwiEBAEEEOoEwBY4wRwxAhBgAcKAESIQAwwIowRFhoBhAE
URL url = new URL("http://api.acoustid.org/v2/lookup?client=" + apikey + "&meta=recordings+releasegroups+releases+tracks+compress&duration=" + duration + "&fingerprint=" + fingerprint);
Cache cache = Cache.getCache("web-datasource");
String response = cache.get(url, String.class);
if (response != null) {
return response;
}
// respect rate limit
REQUEST_LIMIT.acquirePermit();
response = readAll(getReader(url.openConnection()));
cache.put(url, response);
return response;
}
public AudioTrack parse(String json) throws IOException, InterruptedException, ParseException {
Map<?, ?> data = (Map<?, ?>) new JSONParser().parse(json);
if (!data.get("status").equals("ok")) {
throw new IOException("acoustid responded with error: " + data.get("status"));
}
try {
for (Object result : (List<?>) data.get("results")) {
try {
Map<?, ?> recording = (Map<?, ?>) ((List<?>) ((Map<?, ?>) result).get("recordings")).get(0);
String artist = (String) ((Map<?, ?>) ((List<?>) recording.get("artists")).get(0)).get("name");
String title = (String) recording.get("title");
AudioTrack audioTrack = new AudioTrack(artist, title, null);
try {
Map<?, ?> releaseGroup = (Map<?, ?>) ((List<?>) recording.get("releasegroups")).get(0);
List<?> releases = (List<?>) releaseGroup.get("releases");
for (Object it : releases) {
try {
AudioTrack thisRelease = new AudioTrack(artist, title, null);
Map<?, ?> release = (Map<?, ?>) it;
Map<?, ?> date = (Map<?, ?>) release.get("date");
try {
thisRelease.albumReleaseDate = new SimpleDate(Integer.parseInt(date.get("year").toString()), Integer.parseInt(date.get("month").toString()), Integer.parseInt(date.get("day").toString()));
} catch (Exception e) {
// ignore
}
if (thisRelease.albumReleaseDate == null || thisRelease.albumReleaseDate.getTimeStamp() >= (audioTrack.albumReleaseDate == null ? Long.MAX_VALUE : audioTrack.albumReleaseDate.getTimeStamp())) {
continue;
}
Map<?, ?> medium = (Map<?, ?>) ((List<?>) release.get("mediums")).get(0);
thisRelease.mediumIndex = new Integer(medium.get("position").toString());
thisRelease.mediumCount = new Integer(release.get("medium_count").toString());
Map<?, ?> track = (Map<?, ?>) ((List<?>) medium.get("tracks")).get(0);
thisRelease.trackIndex = new Integer(track.get("position").toString());
thisRelease.trackCount = new Integer(medium.get("track_count").toString());
try {
thisRelease.album = release.get("title").toString();
} catch (Exception e) {
thisRelease.album = (String) releaseGroup.get("title");
}
try {
thisRelease.albumArtist = (String) ((Map<?, ?>) ((List<?>) releaseGroup.get("artists")).get(0)).get("name");
} catch (Exception e) {
thisRelease.albumArtist = null;
}
thisRelease.trackTitle = (String) track.get("title");
if (!"Various Artists".equalsIgnoreCase(thisRelease.albumArtist) && (thisRelease.album == null || !thisRelease.album.contains("Greatest Hits"))) {
audioTrack = thisRelease;
}
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
// allow album to be null
}
return audioTrack;
} catch (Exception e) {
}
}
} catch (Exception e) {
}
return null;
}
public String getChromaprintCommand() {
// use fpcalc executable path as specified by the cmdline or default to "fpcalc" and let the shell figure it out
return System.getProperty("net.filebot.AcoustID.fpcalc", "fpcalc");
}
public List<Map<String, String>> fpcalc(Iterable<File> files) throws IOException, InterruptedException {
List<String> command = new ArrayList<String>();
command.add(getChromaprintCommand());
for (File f : files) {
command.add(f.toString());
}
Process process = null;
try {
ProcessBuilder processBuilder = new ProcessBuilder(command);
try {
processBuilder.redirectError(Redirect.INHERIT);
} catch (Throwable e) {
Logger.getLogger(AcoustIDClient.class.getName()).log(Level.WARNING, "Unable to inherit IO: " + e.getMessage());
}
process = processBuilder.start();
} catch (Exception e) {
throw new IOException("Failed to exec fpcalc: " + e.getMessage());
}
Scanner scanner = new Scanner(new InputStreamReader(process.getInputStream(), "UTF-8"));
LinkedList<Map<String, String>> results = new LinkedList<Map<String, String>>();
try {
while (scanner.hasNextLine()) {
String[] value = scanner.nextLine().split("=", 2);
if (value.length != 2)
continue;
if (results.isEmpty() || results.getLast().containsKey(value[0])) {
results.addLast(new HashMap<String, String>(3));
}
results.getLast().put(value[0], value[1]);
}
} finally {
scanner.close();
}
if (process.waitFor() != 0) {
throw new IOException("Failed to exec fpcalc: Exit code " + process.exitValue());
}
return results;
}
}
我找到样本的来源了链接到示例但是我不知道这是什么，也不知道怎么用
你读过代码吗?它显然没有使用任何c++库…通过使用Process可以清楚地看到，它使用子进程来调用fpcalc，并且通过Process. getinputstream()可以看到，它将从所述子进程的标准输出中读取。