/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.olat.core.commons.services.video.spi;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.xml.sax.SAXException;
/**
* <p>Code from Tika project. It has a slight change which break the flow if the height and width
* are found. It speed up a lot the code and we don't want all metadatas but these two.</p>
*
* <p>
* Parser for metadata contained in Flash Videos (.flv). Resources:
* http://osflash.org/flv and for AMF:
* http://download.macromedia.com/pub/labs/amf/amf0_spec_121207.pdf
* <p>
* This parser is capable of extracting the general metadata from header as well
* as embedded metadata.
* <p>
* Known keys for metadata (from file header):
* <ol>
* <li>hasVideo: true|false
* <li>hasSound: true|false
* </ol>
* <p>
* In addition to the above values also metadata that is inserted in to the
* actual stream will be picked. Usually there are keys like:
* hasKeyframes, lastkeyframetimestamp, audiocodecid, keyframes, filepositions,
* hasMetadata, audiosamplerate, videodatarate metadatadate, videocodecid,
* metadatacreator, audiosize, hasVideo, height, audiosamplesize, framerate,
* hasCuePoints width, cuePoints, lasttimestamp, canSeekToEnd, datasize,
* duration, videosize, filesize, audiodatarate, hasAudio, stereo audiodelay
*/
public class FLVParser {
private static int TYPE_METADATA = 0x12;
private static byte MASK_AUDIO = 1;
private static byte MASK_VIDEO = 4;
private boolean hasVideo;
private boolean hasAudio;
private int width = 0;
private int height = 0;
public boolean isHasVideo() {
return hasVideo;
}
public boolean isHasAudio() {
return hasAudio;
}
public int getWidth() {
return width;
}
public int getHeight() {
return height;
}
private long readUInt32(DataInputStream input) throws IOException {
return input.readInt() & 0xFFFFFFFFL;
}
private int readUInt24(DataInputStream input) throws IOException {
int uint = input.read()<<16;
uint += input.read()<<8;
uint += input.read();
return uint;
}
private Object readAMFData(DataInputStream input, int type)
throws IOException {
if (type == -1) {
type = input.readUnsignedByte();
}
switch (type) {
case 0:
return input.readDouble();
case 1:
return input.readUnsignedByte() == 1;
case 2:
return readAMFString(input);
case 3:
return readAMFObject(input);
case 8:
return readAMFEcmaArray(input);
case 10:
return readAMFStrictArray(input);
case 11:
final Date date = new Date((long) input.readDouble());
input.readShort(); // time zone
return date;
case 13:
return "UNDEFINED";
default:
return null;
}
}
private Object readAMFStrictArray(DataInputStream input) throws IOException {
long count = readUInt32(input);
ArrayList<Object> list = new ArrayList<Object>();
for (int i = 0; i < count; i++) {
list.add(readAMFData(input, -1));
}
return list;
}
private String readAMFString(DataInputStream input) throws IOException {
int size = input.readUnsignedShort();
byte[] chars = new byte[size];
input.readFully(chars);
return new String(chars);
}
private Object readAMFObject(DataInputStream input) throws IOException {
HashMap<String, Object> array = new HashMap<String, Object>();
while (true) {
String key = readAMFString(input);
int dataType = input.read();
if (dataType == 9) { // object end marker
break;
}
array.put(key, readAMFData(input, dataType));
}
return array;
}
private Object readAMFEcmaArray(DataInputStream input) throws IOException {
long size = readUInt32(input);
HashMap<String, Object> array = new HashMap<String, Object>();
for (int i = 0; i < size; i++) {
String key = readAMFString(input);
int dataType = input.read();
array.put(key, readAMFData(input, dataType));
}
return array;
}
private boolean checkSignature(DataInputStream fis) throws IOException {
return fis.read() == 'F' && fis.read() == 'L' && fis.read() == 'V';
}
public void parse(InputStream stream)
throws IOException, SAXException {
parseIntern(stream);
}
private void parseIntern(InputStream stream)
throws IOException, SAXException {
DataInputStream datainput = new DataInputStream(stream);
if (!checkSignature(datainput)) {
throw new IOException("FLV signature not detected");
}
// header
int version = datainput.readUnsignedByte();
if (version != 1) {
// should be 1, perhaps this is not flv?
throw new IOException("Unpexpected FLV version: " + version);
}
int typeFlags = datainput.readUnsignedByte();
long len = readUInt32(datainput);
if (len != 9) {
// we only know about format with header of 9 bytes
throw new IOException("Unpexpected FLV header length: " + len);
}
long sizePrev = readUInt32(datainput);
if (sizePrev != 0) {
// should be 0, perhaps this is not flv?
throw new IOException(
"Unpexpected FLV first previous block size: " + sizePrev);
}
hasVideo = (typeFlags & MASK_VIDEO) != 0;
hasAudio = (typeFlags & MASK_AUDIO) != 0;
// flv tag stream follows...
while (true) {
int type = datainput.read();
if (type == -1) {
// EOF
break;
}
int datalen = readUInt24(datainput); //body length
readUInt32(datainput); // timestamp
readUInt24(datainput); // streamid
if (type == TYPE_METADATA) {
// found metadata Tag, read content to buffer
byte[] metaBytes = new byte[datalen];
for (int readCount = 0; readCount < datalen;) {
int r = stream.read(metaBytes, readCount, datalen - readCount);
if(r!=-1) {
readCount += r;
} else {
break;
}
}
ByteArrayInputStream is = new ByteArrayInputStream(metaBytes);
DataInputStream dis = new DataInputStream(is);
Object data = null;
for (int i = 0; i < 2; i++) {
data = readAMFData(dis, -1);
}
if (data instanceof Map) {
// TODO if there are multiple metadata values with same key (in
// separate AMF blocks, we currently loose previous values)
@SuppressWarnings("unchecked")
Map<String, Object> extractedMetadata = (Map<String, Object>) data;
for (Entry<String, Object> entry : extractedMetadata.entrySet()) {
if (entry.getValue() == null) {
continue;
}
if("height".equals(entry.getKey())) {
String h = entry.getValue().toString();
height = Math.round(Float.parseFloat(h));
} else if("width".equals(entry.getKey())) {
String w = entry.getValue().toString();
width = Math.round(Float.parseFloat(w));
}
}
//we only want the height and the width
//we have them, get out of this lengthy file
if(width > 0 && height > 0) {
break;
}
}
} else {
// Tag was not metadata, skip over data we cannot handle
for (int i = 0; i < datalen; i++) {
datainput.readByte();
}
}
sizePrev = readUInt32(datainput); // previous block size
if (sizePrev != datalen + 11) {
// file was corrupt or we could not parse it...
break;
}
}
}
}