1 /* 2 Copyright (c) 2011 Stanislav Vitvitskiy 3 4 Permission is hereby granted, free of charge, to any person obtaining a copy of this 5 software and associated documentation files (the "Software"), to deal in the Software 6 without restriction, including without limitation the rights to use, copy, modify, 7 merge, publish, distribute, sublicense, and/or sell copies of the Software, and to 8 permit persons to whom the Software is furnished to do so, subject to the following 9 conditions: 10 11 The above copyright notice and this permission notice shall be included in all copies or 12 substantial portions of the Software. 13 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 15 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 16 PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 17 FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 18 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 19 OR OTHER DEALINGS IN THE SOFTWARE. 20 */ 21 package com.googlecode.mp4parser.h264.write; 22 23 import com.googlecode.mp4parser.h264.Debug; 24 25 import java.io.IOException; 26 import java.io.OutputStream; 27 28 29 /** 30 * A class responsible for outputting exp-Golumb values into binary stream 31 * 32 * @author Stanislav Vitvitskiy 33 */ 34 public class CAVLCWriter extends BitstreamWriter { 35 CAVLCWriter(OutputStream out)36 public CAVLCWriter(OutputStream out) { 37 super(out); 38 } 39 writeU(int value, int n, String string)40 public void writeU(int value, int n, String string) throws IOException { 41 Debug.print(string + "\t"); 42 writeNBit(value, n); 43 Debug.println("\t" + value); 44 } 45 writeUE(int value)46 public void writeUE(int value) throws IOException { 47 int bits = 0; 48 int cumul = 0; 49 for (int i = 0; i < 15; i++) { 50 if (value < cumul + (1 << i)) { 51 bits = i; 52 break; 53 } 54 cumul += (1 << i); 55 } 56 writeNBit(0, bits); 57 write1Bit(1); 58 writeNBit(value - cumul, bits); 59 } 60 writeUE(int value, String string)61 public void writeUE(int value, String string) throws IOException { 62 Debug.print(string + "\t"); 63 writeUE(value); 64 Debug.println("\t" + value); 65 } 66 writeSE(int value, String string)67 public void writeSE(int value, String string) throws IOException { 68 Debug.print(string + "\t"); 69 writeUE((value << 1) * (value < 0 ? -1 : 1) + (value > 0 ? 1 : 0)); 70 Debug.println("\t" + value); 71 } 72 writeBool(boolean value, String string)73 public void writeBool(boolean value, String string) throws IOException { 74 Debug.print(string + "\t"); 75 write1Bit(value ? 1 : 0); 76 Debug.println("\t" + value); 77 } 78 writeU(int i, int n)79 public void writeU(int i, int n) throws IOException { 80 writeNBit(i, n); 81 } 82 writeNBit(long value, int n, String string)83 public void writeNBit(long value, int n, String string) throws IOException { 84 Debug.print(string + "\t"); 85 for (int i = 0; i < n; i++) { 86 write1Bit((int) (value >> (n - i - 1)) & 0x1); 87 } 88 Debug.println("\t" + value); 89 } 90 writeTrailingBits()91 public void writeTrailingBits() throws IOException { 92 write1Bit(1); 93 writeRemainingZero(); 94 flush(); 95 } 96 writeSliceTrailingBits()97 public void writeSliceTrailingBits() { 98 throw new IllegalStateException("todo"); 99 } 100 }