private MP4Parser(final String path) throws IOException, FileNotFoundException {
mFile = new RandomAccessFile(new File(path), "r");
try {
parse("", mFile.length());
} catch (Exception e) {
e.printStackTrace();
throw new IOException("Parse error: malformed mp4 file");
}
}
private void parse(String path, long len) throws IOException {
ByteBuffer byteBuffer;
long sum = 0, newlen = 0;
byte[] buffer = new byte[8];
String name = "";
if (!path.equals("")) mBoxes.put(path, mPos - 8);
while (sum < len) {
mFile.read(buffer, 0, 8);
mPos += 8;
sum += 8;
if (validBoxName(buffer)) {
name = new String(buffer, 4, 4);
if (buffer[3] == 1) {
// 64 bits atom size
mFile.read(buffer, 0, 8);
mPos += 8;
sum += 8;
byteBuffer = ByteBuffer.wrap(buffer, 0, 8);
newlen = byteBuffer.getLong() - 16;
} else {
// 32 bits atom size
byteBuffer = ByteBuffer.wrap(buffer, 0, 4);
newlen = byteBuffer.getInt() - 8;
}
// 1061109559+8 correspond to "????" in ASCII the HTC Desire S seems to write that
// sometimes, maybe other phones do
// "wide" atom would produce a newlen == 0, and we shouldn't throw an exception because of
// that
if (newlen < 0 || newlen == 1061109559) throw new IOException();
Log.d(TAG, "Atom -> name: " + name + " position: " + mPos + ", length: " + newlen);
sum += newlen;
parse(path + '/' + name, newlen);
} else {
if (len < 8) {
mFile.seek(mFile.getFilePointer() - 8 + len);
sum += len - 8;
} else {
int skipped = mFile.skipBytes((int) (len - 8));
if (skipped < ((int) (len - 8))) {
throw new IOException();
}
mPos += len - 8;
sum += len - 8;
}
}
}
}
/**
* Finds sps & pps parameters inside a .mp4.
*
* @param path Path to the file to analyze
* @throws IOException
* @throws FileNotFoundException
*/
public MP4Config(String path) throws IOException, FileNotFoundException {
StsdBox stsdBox;
// We open the mp4 file
mp4Parser = new MP4Parser(path);
// We parse it
try {
mp4Parser.parse();
} catch (IOException ignore) {
// Maybe enough of the file has been parsed and we can get the stsd box
}
// We find the stsdBox
stsdBox = mp4Parser.getStsdBox();
mPPS = stsdBox.getB64PPS();
mSPS = stsdBox.getB64SPS();
mProfilLevel = stsdBox.getProfileLevel();
// We're done !
mp4Parser.close();
}
