1 files changed, 97 insertions, 0 deletions
diff --git a/src/javaFlacEncoder/Subframe_Constant.java b/src/javaFlacEncoder/Subframe_Constant.java
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+++ b/src/javaFlacEncoder/Subframe_Constant.java
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+/*
+ * Copyright (C) 2010  Preston Lacey http://javaflacencoder.sourceforge.net/
+ * All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package javaFlacEncoder;
+
+/**
+ * Implements the Subframe abstract class, providing encoding support for the
+ * FLAC Constant Subframe.
+ *
+ * @author Preston Lacey
+ */
+public class Subframe_Constant extends Subframe {
+  /** For debugging: Higher values equals greater output, generally by
+   * increments of 10. */
+  public static int DEBUG_LEV = 0;
+  /** Subframe type supported by this implementation. */
+  public static final EncodingConfiguration.SubframeType type =
+      EncodingConfiguration.SubframeType.VERBATIM;
+  int sampleSize = 0;
+
+  /**
+   * Constructor. Sets StreamConfiguration to use. If the StreamConfiguration
+   * must later be changed, a new Subframe object must be created as well.
+   *
+   * @param sc StreamConfiguration to use for encoding.
+   */
+  public Subframe_Constant(StreamConfiguration sc) {
+    super(sc);
+    sampleSize = sc.getBitsPerSample();
+  }
+
+  /**
+   * This method is used to set the encoding configuration.
+   * @param ec    encoding configuration to use.
+   * @return      true if configuration was changed, false otherwise
+   */
+  @Override
+  public boolean registerConfiguration(EncodingConfiguration ec) {
+    super.registerConfiguration(ec);
+    return true;
+  }
+
+    
+  public int encodeSamples(int[] samples, int count, int start, int skip,
+      EncodedElement data, int offset, int bitsPerSample ) {
+    if(DEBUG_LEV > 0) {
+      System.err.println("Subframe_Verbatim::encodeSamples(...)");
+    }
+    int encodedSamples = count;
+    int bits = bitsPerSample+offset+8;
+    int bytesNeeded = bits/8;
+    if(bits%8 != 0)
+      bytesNeeded++;
+    data.clear(bytesNeeded, offset);
+    data.addInt(0,1);
+    data.addInt(0,6);
+    data.addInt(0,1);
+
+    int value = samples[start];
+    int increment = skip+1;
+    int end = start+increment*count;
+    int lastValid = end-increment;//assume all were the same
+    for(int i = start; i < end; i+= increment) {
+      if(samples[i] != value) {
+        lastValid = i-increment;//if one differed, find where
+        break;
+      }
+    }
+    encodedSamples = (lastValid-start)/increment+1;
+    data.addInt(value,bitsPerSample);
+    lastEncodedSize = bits - offset;
+    System.out.flush();
+    if(DEBUG_LEV > 0)
+      System.err.println("Subframe_Verbatim::encodeSamples(...): End");
+    if(DEBUG_LEV > 10) {
+      System.err.println("--: bitsUsed : "+bits+"  : Bytes : "+bytesNeeded);
+    }
+    return encodedSamples;
+  }
+
+}