1dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu/* 2dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * Copyright 2012 Sebastian Annies, Hamburg 3dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * 4dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * Licensed under the Apache License, Version 2.0 (the License); 5dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * you may not use this file except in compliance with the License. 6dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * You may obtain a copy of the License at 7dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * 8dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * http://www.apache.org/licenses/LICENSE-2.0 9dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * 10dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * Unless required by applicable law or agreed to in writing, software 11dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * distributed under the License is distributed on an AS IS BASIS, 12dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * See the License for the specific language governing permissions and 14dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * limitations under the License. 15dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu */ 16dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhupackage com.googlecode.mp4parser.authoring.builder; 17dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu 18dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhuimport java.nio.ByteBuffer; 19dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhuimport java.nio.MappedByteBuffer; 20dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhuimport java.util.ArrayList; 21dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhuimport java.util.List; 22dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu 23dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu/** 24dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu * Used to merge adjacent byte buffers. 25dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu */ 26dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhupublic class ByteBufferHelper { 27dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu public static List<ByteBuffer> mergeAdjacentBuffers(List<ByteBuffer> samples) { 28dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu ArrayList<ByteBuffer> nuSamples = new ArrayList<ByteBuffer>(samples.size()); 29dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu for (ByteBuffer buffer : samples) { 30dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu int lastIndex = nuSamples.size() - 1; 31dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu if (lastIndex >= 0 && buffer.hasArray() && nuSamples.get(lastIndex).hasArray() && buffer.array() == nuSamples.get(lastIndex).array() && 32dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu nuSamples.get(lastIndex).arrayOffset() + nuSamples.get(lastIndex).limit() == buffer.arrayOffset()) { 33dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu ByteBuffer oldBuffer = nuSamples.remove(lastIndex); 34dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu ByteBuffer nu = ByteBuffer.wrap(buffer.array(), oldBuffer.arrayOffset(), oldBuffer.limit() + buffer.limit()).slice(); 35dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu // We need to slice here since wrap([], offset, length) just sets position and not the arrayOffset. 36dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu nuSamples.add(nu); 37dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu } else if (lastIndex >= 0 && 38dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu buffer instanceof MappedByteBuffer && nuSamples.get(lastIndex) instanceof MappedByteBuffer && 39dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu nuSamples.get(lastIndex).limit() == nuSamples.get(lastIndex).capacity() - buffer.capacity()) { 40dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu // This can go wrong - but will it? 41dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu ByteBuffer oldBuffer = nuSamples.get(lastIndex); 42dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu oldBuffer.limit(buffer.limit() + oldBuffer.limit()); 43dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu } else { 44dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu buffer.rewind(); 45dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu nuSamples.add(buffer); 46dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu } 47dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu } 48dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu return nuSamples; 49dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu } 50dd9eb897ee7c7b507cbdcf80263bb4b5de6966bfTeng-Hui Zhu} 51