private void parseHeader() throws IOException {
LOGGER.trace("Parsing AVI stream");
String id = getString(stream, 4);
getBytes(stream, 4);
String type = getString(stream, 4);
if (!"RIFF".equalsIgnoreCase(id) || !"AVI ".equalsIgnoreCase(type)) {
throw new IOException("Not AVI file");
}
byte[] hdrl = null;
while (true) {
String command = getString(stream, 4);
int length = (readBytes(stream, 4) + 1) & ~1;
if ("LIST".equalsIgnoreCase(command)) {
command = getString(stream, 4);
length -= 4;
if ("movi".equalsIgnoreCase(command)) {
break;
}
if ("hdrl".equalsIgnoreCase(command)) {
hdrl = getBytes(stream, length);
}
if ("idx1".equalsIgnoreCase(command)) {
/*idx = */ getBytes(stream, length);
}
if ("iddx".equalsIgnoreCase(command)) {
/*idx = */ getBytes(stream, length);
}
} else {
getBytes(stream, length);
}
}
int streamNumber = 0;
int lastTagID = 0;
for (int i = 0; i < hdrl.length; ) {
String command = new String(hdrl, i, 4);
int size = str2ulong(hdrl, i + 4);
if ("LIST".equalsIgnoreCase(command)) {
i += 12;
continue;
}
String command2 = new String(hdrl, i + 8, 4);
if ("strh".equalsIgnoreCase(command)) {
lastTagID = 0;
if ("vids".equalsIgnoreCase(command2)) {
String compressor = new String(hdrl, i + 12, 4);
int scale = str2ulong(hdrl, i + 28);
int rate = str2ulong(hdrl, i + 32);
track[0] = new Track(compressor, scale, rate, -1);
streamVideoTag =
new String(
new char[] {
(char) ((streamNumber / 10) + '0'), (char) ((streamNumber % 10) + '0'), 'd', 'b'
});
streamNumber++;
lastTagID = 1;
}
if ("auds".equalsIgnoreCase(command2)) {
int scale = str2ulong(hdrl, i + 28);
int rate = str2ulong(hdrl, i + 32);
int sampleSize = str2ulong(hdrl, i + 52);
track[1 + numberOfAudioChannels++] = new Track(null, scale, rate, sampleSize);
streamNumber++;
lastTagID = 2;
}
}
if ("strf".equalsIgnoreCase(command)) {
if (lastTagID == 1) {
byte[] information = new byte[size]; // formerly size-4
System.arraycopy(hdrl, i + 8, information, 0, information.length); // formerly i+4
track[0].setBih(information);
}
if (lastTagID == 2) {
byte[] information = new byte[size]; // formerly size-4
System.arraycopy(hdrl, i + 8, information, 0, information.length); // formerly i+4
Track aud = track[1 + numberOfAudioChannels - 1];
aud.setBih(information);
int bitsPerSample = str2ushort(information, 14);
aud.setBitsPerSample(bitsPerSample);
int nbAudio = str2ushort(information, 2);
aud.setNbAudio(nbAudio);
long fileLength = 100;
if (params.losslessaudio) {
aOut = new PCMAudioOutputStream(aOut, nbAudio, 48000, bitsPerSample);
}
if (!params.lossyaudio && params.losslessaudio) {
writePCMHeader(
aOut, fileLength, nbAudio, aud.getRate(), aud.getSampleSize(), bitsPerSample);
}
}
}
if (size % 2 != 0) {
size++;
}
i += size + 8;
}
LOGGER.trace("Found " + streamNumber + " stream(s)");
boolean init = false;
while (true) {
String command;
try {
command = getString(stream, 4);
} catch (Exception e) {
LOGGER.trace("Error reading stream: " + e.getMessage());
break;
}
if (command == null) {
break;
}
command = command.toUpperCase();
int size = readBytes(stream, 4);
boolean framed = false;
while ("LIST".equals(command) || "RIFF".equals(command) || "JUNK".equals(command)) {
if (size < 0) {
size = 4;
}
getBytes(stream, "RIFF".equals(command) ? 4 : size);
command = getString(stream, 4).toUpperCase();
size = readBytes(stream, 4);
if (("LIST".equals(command) || "RIFF".equals(command) || "JUNK".equals(command))
&& (size % 2 != 0)) {
readByte(stream);
}
}
String videoTag = streamVideoTag.substring(0, 3);
if (command.substring(0, 3).equalsIgnoreCase(videoTag)
&& (command.charAt(3) == 'B' || command.charAt(3) == 'C')) {
byte[] buffer = getBytes(stream, size);
if (!command.equalsIgnoreCase("IDX1")) {
vOut.write(buffer);
videosize += size;
}
framed = true;
}
if (!framed) {
for (int i = 0; i < numberOfAudioChannels; i++) {
byte[] buffer = getBytes(stream, size);
if (!command.equalsIgnoreCase("IDX1")) {
aOut.write(buffer, init ? 4 : 0, init ? (size - 4) : size);
init = false;
audiosize += size;
}
framed = true;
}
}
if (!framed) {
throw new IOException("Not header: " + command);
}
if (size % 2 != 0) {
readByte(stream);
}
}
LOGGER.trace("output pipes closed");
aOut.close();
vOut.close();
}