diff options
Diffstat (limited to 'isoparser/src/main/java/com/googlecode/mp4parser/h264/model/ScalingList.java')
| -rw-r--r-- | isoparser/src/main/java/com/googlecode/mp4parser/h264/model/ScalingList.java | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/googlecode/mp4parser/h264/model/ScalingList.java b/isoparser/src/main/java/com/googlecode/mp4parser/h264/model/ScalingList.java new file mode 100644 index 0000000..5d272bf --- /dev/null +++ b/isoparser/src/main/java/com/googlecode/mp4parser/h264/model/ScalingList.java @@ -0,0 +1,83 @@ +/* +Copyright (c) 2011 Stanislav Vitvitskiy + +Permission is hereby granted, free of charge, to any person obtaining a copy of this +software and associated documentation files (the "Software"), to deal in the Software +without restriction, including without limitation the rights to use, copy, modify, +merge, publish, distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to the following +conditions: + +The above copyright notice and this permission notice shall be included in all copies or +substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, +INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR +PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE +FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE +OR OTHER DEALINGS IN THE SOFTWARE. +*/ +package com.googlecode.mp4parser.h264.model; + +import com.googlecode.mp4parser.h264.read.CAVLCReader; +import com.googlecode.mp4parser.h264.write.CAVLCWriter; + +import java.io.IOException; + +/** + * Scaling list entity + * <p/> + * capable to serialize / deserialize with CAVLC bitstream + * + * @author Stanislav Vitvitskiy + */ +public class ScalingList { + + public int[] scalingList; + public boolean useDefaultScalingMatrixFlag; + + public void write(CAVLCWriter out) throws IOException { + if (useDefaultScalingMatrixFlag) { + out.writeSE(0, "SPS: "); + return; + } + + int lastScale = 8; + int nextScale = 8; + for (int j = 0; j < scalingList.length; j++) { + if (nextScale != 0) { + int deltaScale = scalingList[j] - lastScale - 256; + out.writeSE(deltaScale, "SPS: "); + } + lastScale = scalingList[j]; + } + } + + public static ScalingList read(CAVLCReader is, int sizeOfScalingList) + throws IOException { + + ScalingList sl = new ScalingList(); + sl.scalingList = new int[sizeOfScalingList]; + int lastScale = 8; + int nextScale = 8; + for (int j = 0; j < sizeOfScalingList; j++) { + if (nextScale != 0) { + int deltaScale = is.readSE("deltaScale"); + nextScale = (lastScale + deltaScale + 256) % 256; + sl.useDefaultScalingMatrixFlag = (j == 0 && nextScale == 0); + } + sl.scalingList[j] = nextScale == 0 ? lastScale : nextScale; + lastScale = sl.scalingList[j]; + } + return sl; + } + + @Override + public String toString() { + return "ScalingList{" + + "scalingList=" + scalingList + + ", useDefaultScalingMatrixFlag=" + useDefaultScalingMatrixFlag + + '}'; + } +}
\ No newline at end of file |