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A generic parser and writer for all ISO 14496 based files (MP4, Quicktime, DCF, PDCF, ...)

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/*
 * Copyright 2012 castLabs, Berlin
 *
 * 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.boxes.mp4.samplegrouping;

import java.nio.ByteBuffer;

/**
 * 

4cc = "{@value #TYPE}"

*

* For some coding systems a sync sample is specified to be a random access point after which all samples in decoding * order can be correctly decoded. However, it may be possible to encode an “open” random access point, after which all * samples in output order can be correctly decoded, but some samples following the random access point in decoding * order and preceding the random access point in output order need not be correctly decodable. For example, an intra * picture starting an open group of pictures can be followed in decoding order by (bi-)predicted pictures that however * precede the intra picture in output order; though they possibly cannot be correctly decoded if the decoding starts * from the intra picture, they are not needed. *

*

* Such "open" random-access samples can be marked by being a member of this group. Samples marked by this group must * be random access points, and may also be sync points (i.e. it is not required that samples marked by the sync sample * table be excluded). *

*/ public class VisualRandomAccessEntry extends GroupEntry { public static final String TYPE = "rap "; private boolean numLeadingSamplesKnown; private short numLeadingSamples; @Override public String getType() { return TYPE; } public boolean isNumLeadingSamplesKnown() { return numLeadingSamplesKnown; } public void setNumLeadingSamplesKnown(boolean numLeadingSamplesKnown) { this.numLeadingSamplesKnown = numLeadingSamplesKnown; } public short getNumLeadingSamples() { return numLeadingSamples; } public void setNumLeadingSamples(short numLeadingSamples) { this.numLeadingSamples = numLeadingSamples; } @Override public void parse(ByteBuffer byteBuffer) { final byte b = byteBuffer.get(); numLeadingSamplesKnown = ((b & 0x80) == 0x80); numLeadingSamples = (short) (b & 0x7f); } @Override public ByteBuffer get() { ByteBuffer content = ByteBuffer.allocate(1); content.put((byte) ((numLeadingSamplesKnown ? 0x80 : 0x00) | (numLeadingSamples & 0x7f))); content.rewind(); return content; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; VisualRandomAccessEntry that = (VisualRandomAccessEntry) o; if (numLeadingSamples != that.numLeadingSamples) return false; if (numLeadingSamplesKnown != that.numLeadingSamplesKnown) return false; return true; } @Override public int hashCode() { int result = (numLeadingSamplesKnown ? 1 : 0); result = 31 * result + (int) numLeadingSamples; return result; } @Override public String toString() { final StringBuilder sb = new StringBuilder(); sb.append("VisualRandomAccessEntry"); sb.append("{numLeadingSamplesKnown=").append(numLeadingSamplesKnown); sb.append(", numLeadingSamples=").append(numLeadingSamples); sb.append('}'); return sb.toString(); } }




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