add seeking video support (danikula#21) and fix streaming while caching (danikula#17)

Author: danikula

README.md

@@ -12,7 +12,7 @@ repositories {
     maven { url 'https://dl.bintray.com/alexeydanilov/maven' }
 }
 dependencies {
-    compile 'com.danikula:videocache:2.1.4'
+    compile 'com.danikula:videocache:2.2.0'
 }
 ```
 
@@ -34,7 +34,7 @@ private HttpProxyCacheServer getProxy() {
 ```
 
 To guarantee normal work you should use **single** instance of `HttpProxyCacheServer` for whole app.
-For example you can store shared proxy on your `Application`:
+For example you can store shared proxy in your `Application`:
 
 ```java
 public class App extends Application {
@@ -59,6 +59,9 @@ More preferable way is use some dependency injector like [Dagger](http://square.
 See `sample` app for details.
 
 ## Whats new
+### 2.2.0
+- allow to [seek video](https://github.com/danikula/AndroidVideoCache/issues/21) in any position and [fix](https://github.com/danikula/AndroidVideoCache/issues/17) streaming while caching  
+
 ### 2.1.4
 - [fix](https://github.com/danikula/AndroidVideoCache/issues/18) available cache percents callback 
 

library/build.gradle

@@ -26,7 +26,7 @@ publish {
     userOrg = 'alexeydanilov'
     groupId = 'com.danikula'
     artifactId = 'videocache'
-    publishVersion = '2.1.4'
+    publishVersion = '2.2.0'
     description = 'Cache support for android VideoView'
     website = 'https://github.com/danikula/AndroidVideoCache'
 }

library/src/main/java/com/danikula/videocache/ByteArraySource.java

@@ -22,7 +22,7 @@ public int read(byte[] buffer) throws ProxyCacheException {
     }
 
     @Override
-    public int available() throws ProxyCacheException {
+    public int length() throws ProxyCacheException {
         return data.length;
     }
 

library/src/main/java/com/danikula/videocache/GetRequest.java

@@ -63,9 +63,9 @@ private String findUri(String request) {
     @Override
     public String toString() {
         return "GetRequest{" +
-                "uri='" + uri + '\'' +
-                ", rangeOffset=" + rangeOffset +
+                "rangeOffset=" + rangeOffset +
                 ", partial=" + partial +
+                ", uri='" + uri + '\'' +
                 '}';
     }
 }

library/src/main/java/com/danikula/videocache/HttpProxyCache.java

@@ -7,13 +7,17 @@
 import java.io.OutputStream;
 import java.net.Socket;
 
+import static com.danikula.videocache.ProxyCacheUtils.DEFAULT_BUFFER_SIZE;
+
 /**
  * {@link ProxyCache} that read http url and writes data to {@link Socket}
  *
  * @author Alexey Danilov ([email protected]).
  */
 class HttpProxyCache extends ProxyCache {
 
+    private static final float NO_CACHE_BARRIER = .2f;
+
     private final HttpUrlSource source;
     private final FileCache cache;
     private CacheListener listener;
@@ -30,27 +34,29 @@ public void registerCacheListener(CacheListener cacheListener) {
 
     public void processRequest(GetRequest request, Socket socket) throws IOException, ProxyCacheException {
         OutputStream out = new BufferedOutputStream(socket.getOutputStream());
-        byte[] buffer = new byte[ProxyCacheUtils.DEFAULT_BUFFER_SIZE];
-        int readBytes;
-        boolean headersWrote = false;
+        String responseHeaders = newResponseHeaders(request);
+        out.write(responseHeaders.getBytes("UTF-8"));
+
         long offset = request.rangeOffset;
-        while ((readBytes = read(buffer, offset, buffer.length)) != -1) {
-            // tiny optimization: to prevent HEAD request in source for content-length. content-length 'll available after reading source
-            if (!headersWrote) {
-                String responseHeaders = newResponseHeaders(request);
-                out.write(responseHeaders.getBytes("UTF-8"));
-                headersWrote = true;
-            }
-            out.write(buffer, 0, readBytes);
-            offset += readBytes;
+        if (isUseCache(request)) {
+            responseWithCache(out, offset);
+        } else {
+            responseWithoutCache(out, offset);
         }
-        out.flush();
+    }
+
+    private boolean isUseCache(GetRequest request) throws ProxyCacheException {
+        int sourceLength = source.length();
+        boolean sourceLengthKnown = sourceLength > 0;
+        int cacheAvailable = cache.available();
+        // do not use cache for partial requests which too far from available cache. It seems user seek video.
+        return !sourceLengthKnown || !request.partial || request.rangeOffset <= cacheAvailable + sourceLength * NO_CACHE_BARRIER;
     }
 
     private String newResponseHeaders(GetRequest request) throws IOException, ProxyCacheException {
         String mime = source.getMime();
         boolean mimeKnown = !TextUtils.isEmpty(mime);
-        int length = cache.isCompleted() ? cache.available() : source.available();
+        int length = cache.isCompleted() ? cache.available() : source.length();
         boolean lengthKnown = length >= 0;
         long contentLength = request.partial ? length - request.rangeOffset : length;
         boolean addRange = lengthKnown && request.partial;
@@ -64,6 +70,32 @@ private String newResponseHeaders(GetRequest request) throws IOException, ProxyC
                 .toString();
     }
 
+    private void responseWithCache(OutputStream out, long offset) throws ProxyCacheException, IOException {
+        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
+        int readBytes;
+        while ((readBytes = read(buffer, offset, buffer.length)) != -1) {
+            out.write(buffer, 0, readBytes);
+            offset += readBytes;
+        }
+        out.flush();
+    }
+
+    private void responseWithoutCache(OutputStream out, long offset) throws ProxyCacheException, IOException {
+        try {
+            HttpUrlSource source = new HttpUrlSource(this.source);
+            source.open((int) offset);
+            byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
+            int readBytes;
+            while ((readBytes = source.read(buffer)) != -1) {
+                out.write(buffer, 0, readBytes);
+                offset += readBytes;
+            }
+            out.flush();
+        } finally {
+            source.close();
+        }
+    }
+
     @Override
     protected void onCachePercentsAvailableChanged(int percents) {
         if (listener != null) {

library/src/main/java/com/danikula/videocache/HttpProxyCacheServer.java

@@ -79,7 +79,7 @@ public HttpProxyCacheServer(FileNameGenerator fileNameGenerator) {
 
     private void makeSureServerWorks() {
         int maxPingAttempts = 3;
-        int delay = 100;
+        int delay = 200;
         int pingAttempts = 0;
         while (pingAttempts < maxPingAttempts) {
             try {
@@ -92,13 +92,13 @@ private void makeSureServerWorks() {
                 SystemClock.sleep(delay);
                 delay *= 2;
             } catch (InterruptedException | ExecutionException | TimeoutException e) {
-                Log.e(LOG_TAG, "Error pinging server. Shutdown it... If you see this message, please, email me [email protected]", e);
+                Log.e(LOG_TAG, "Error pinging server [attempt: " + pingAttempts + ", timeout: " + delay + "]. ", e);
             }
         }
 
-        if (!pinged) {
-            shutdown();
-        }
+        Log.e(LOG_TAG, "Shutdown server… Error pinging server [attempt: " + pingAttempts + ", timeout: " + delay + "]. " +
+                "If you see this message, please, email me [email protected]");
+        shutdown();
     }
 
     private boolean pingServer() throws ProxyCacheException {
@@ -212,7 +212,7 @@ private void processSocket(Socket socket) {
         } catch (SocketException e) {
             // There is no way to determine that client closed connection http://stackoverflow.com/a/10241044/999458
             // So just to prevent log flooding don't log stacktrace
-            Log.d(LOG_TAG, "Client communication problem. It seems client closed connection");
+            Log.d(LOG_TAG, "Closing socket… Socket is closed by client.");
         } catch (ProxyCacheException | IOException e) {
             onError(new ProxyCacheException("Error processing request", e));
         } finally {
@@ -262,7 +262,7 @@ private void closeSocketInput(Socket socket) {
         } catch (SocketException e) {
             // There is no way to determine that client closed connection http://stackoverflow.com/a/10241044/999458
             // So just to prevent log flooding don't log stacktrace
-            Log.d(LOG_TAG, "Error closing client's input stream: it seems client closed connection");
+            Log.d(LOG_TAG, "Releasing input stream… Socket is closed by client.");
         } catch (IOException e) {
             onError(new ProxyCacheException("Error closing socket input stream", e));
         }

library/src/main/java/com/danikula/videocache/HttpUrlSource.java

@@ -29,7 +29,7 @@ public class HttpUrlSource implements Source {
     public final String url;
     private HttpURLConnection connection;
     private InputStream inputStream;
-    private volatile int available = Integer.MIN_VALUE;
+    private volatile int length = Integer.MIN_VALUE;
     private volatile String mime;
 
     public HttpUrlSource(String url) {
@@ -41,12 +41,18 @@ public HttpUrlSource(String url, String mime) {
         this.mime = mime;
     }
 
+    public HttpUrlSource(HttpUrlSource source) {
+        this.url = source.url;
+        this.mime = source.mime;
+        this.length = source.length;
+    }
+
     @Override
-    public synchronized int available() throws ProxyCacheException {
-        if (available == Integer.MIN_VALUE) {
+    public synchronized int length() throws ProxyCacheException {
+        if (length == Integer.MIN_VALUE) {
             fetchContentInfo();
         }
-        return available;
+        return length;
     }
 
     @Override
@@ -55,7 +61,7 @@ public void open(int offset) throws ProxyCacheException {
             connection = openConnection(offset, "GET", -1);
             mime = connection.getContentType();
             inputStream = new BufferedInputStream(connection.getInputStream(), DEFAULT_BUFFER_SIZE);
-            available = readSourceAvailableBytes(connection, offset, connection.getResponseCode());
+            length = readSourceAvailableBytes(connection, offset, connection.getResponseCode());
         } catch (IOException e) {
             throw new ProxyCacheException("Error opening connection for " + url + " with offset " + offset, e);
         }
@@ -64,7 +70,7 @@ public void open(int offset) throws ProxyCacheException {
     private int readSourceAvailableBytes(HttpURLConnection connection, int offset, int responseCode) throws IOException {
         int contentLength = connection.getContentLength();
         return responseCode == HTTP_OK ? contentLength
-                : responseCode == HTTP_PARTIAL ? contentLength + offset : available;
+                : responseCode == HTTP_PARTIAL ? contentLength + offset : length;
     }
 
     @Override
@@ -94,10 +100,10 @@ private void fetchContentInfo() throws ProxyCacheException {
         InputStream inputStream = null;
         try {
             urlConnection = openConnection(0, "HEAD", 10000);
-            available = urlConnection.getContentLength();
+            length = urlConnection.getContentLength();
             mime = urlConnection.getContentType();
             inputStream = urlConnection.getInputStream();
-            Log.i(LOG_TAG, "Content info for `" + url + "`: mime: " + mime + ", content-length: " + available);
+            Log.i(LOG_TAG, "Content info for `" + url + "`: mime: " + mime + ", content-length: " + length);
         } catch (IOException e) {
             Log.e(LOG_TAG, "Error fetching info from " + url, e);
         } finally {

library/src/main/java/com/danikula/videocache/ProxyCache.java

@@ -119,7 +119,7 @@ private void readSource() {
         try {
             offset = cache.available();
             source.open(offset);
-            sourceAvailable = source.available();
+            sourceAvailable = source.length();
             byte[] buffer = new byte[ProxyCacheUtils.DEFAULT_BUFFER_SIZE];
             int readBytes;
             while ((readBytes = source.read(buffer)) != -1) {
@@ -144,7 +144,7 @@ private void readSource() {
 
     private void tryComplete() throws ProxyCacheException {
         synchronized (stopLock) {
-            if (!isStopped() && cache.available() == source.available()) {
+            if (!isStopped() && cache.available() == source.length()) {
                 cache.complete();
             }
         }

library/src/main/java/com/danikula/videocache/Source.java

@@ -16,12 +16,12 @@ public interface Source {
     void open(int offset) throws ProxyCacheException;
 
     /**
-     * Returns available bytes or <b>negative value</b> if available bytes count is unknown.
+     * Returns length bytes or <b>negative value</b> if length is unknown.
      *
-     * @return bytes available
+     * @return bytes length
      * @throws ProxyCacheException if error occur while fetching source data.
      */
-    int available() throws ProxyCacheException;
+    int length() throws ProxyCacheException;
 
     /**
      * Read data to byte buffer from source with current offset.

sample/build.gradle

@@ -39,7 +39,7 @@ dependencies {
 //    compile project(':library')
     compile 'com.android.support:support-v4:23.0.1'
     compile 'org.androidannotations:androidannotations-api:3.3.2'
-    compile 'com.danikula:videocache:2.1.4'
+    compile 'com.danikula:videocache:2.2.0'
     compile 'com.viewpagerindicator:library:2.4.2-SNAPSHOT@aar'
     apt 'org.androidannotations:androidannotations:3.3.2'
 }