| /* |
| * Copyright 2012 Sebastian Annies, Hamburg |
| * |
| * Licensed under the Apache License, Version 2.0 (the License); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an AS IS BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.googlecode.mp4parser.authoring.builder; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.MappedByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Used to merge adjacent byte buffers. |
| */ |
| public class ByteBufferHelper { |
| public static List<ByteBuffer> mergeAdjacentBuffers(List<ByteBuffer> samples) { |
| ArrayList<ByteBuffer> nuSamples = new ArrayList<ByteBuffer>(samples.size()); |
| for (ByteBuffer buffer : samples) { |
| int lastIndex = nuSamples.size() - 1; |
| if (lastIndex >= 0 && buffer.hasArray() && nuSamples.get(lastIndex).hasArray() && buffer.array() == nuSamples.get(lastIndex).array() && |
| nuSamples.get(lastIndex).arrayOffset() + nuSamples.get(lastIndex).limit() == buffer.arrayOffset()) { |
| ByteBuffer oldBuffer = nuSamples.remove(lastIndex); |
| ByteBuffer nu = ByteBuffer.wrap(buffer.array(), oldBuffer.arrayOffset(), oldBuffer.limit() + buffer.limit()).slice(); |
| // We need to slice here since wrap([], offset, length) just sets position and not the arrayOffset. |
| nuSamples.add(nu); |
| } else if (lastIndex >= 0 && |
| buffer instanceof MappedByteBuffer && nuSamples.get(lastIndex) instanceof MappedByteBuffer && |
| nuSamples.get(lastIndex).limit() == nuSamples.get(lastIndex).capacity() - buffer.capacity()) { |
| // This can go wrong - but will it? |
| ByteBuffer oldBuffer = nuSamples.get(lastIndex); |
| oldBuffer.limit(buffer.limit() + oldBuffer.limit()); |
| } else { |
| buffer.rewind(); |
| nuSamples.add(buffer); |
| } |
| } |
| return nuSamples; |
| } |
| } |