// return a byte array containing the full content of the atom (including header)
public byte[] getBytes() {
byte[] atom_bytes = new byte[mSize];
int offset = 0;
atom_bytes[offset++] = (byte) ((mSize >> 24) & 0xFF);
atom_bytes[offset++] = (byte) ((mSize >> 16) & 0xFF);
atom_bytes[offset++] = (byte) ((mSize >> 8) & 0xFF);
atom_bytes[offset++] = (byte) (mSize & 0xFF);
atom_bytes[offset++] = (byte) ((mType >> 24) & 0xFF);
atom_bytes[offset++] = (byte) ((mType >> 16) & 0xFF);
atom_bytes[offset++] = (byte) ((mType >> 8) & 0xFF);
atom_bytes[offset++] = (byte) (mType & 0xFF);
if (mVersion >= 0) {
atom_bytes[offset++] = mVersion;
atom_bytes[offset++] = (byte) ((mFlags >> 16) & 0xFF);
atom_bytes[offset++] = (byte) ((mFlags >> 8) & 0xFF);
atom_bytes[offset++] = (byte) (mFlags & 0xFF);
}
if (mData != null) {
System.arraycopy(mData, 0, atom_bytes, offset, mData.length);
} else if (mChildren != null) {
byte[] child_bytes;
for (Atom child : mChildren) {
child_bytes = child.getBytes();
System.arraycopy(child_bytes, 0, atom_bytes, offset, child_bytes.length);
offset += child_bytes.length;
}
}
return atom_bytes;
}
private void setHeader() {
// create the atoms needed to build the header.
Atom a_ftyp = getFTYPAtom();
Atom a_moov = getMOOVAtom();
Atom a_mdat = new Atom("mdat"); // create an empty atom. The AAC stream data should follow
// immediately after. The correct size will be set later.
// set the correct chunk offset in the stco atom.
Atom a_stco = a_moov.getChild("trak.mdia.minf.stbl.stco");
if (a_stco == null) {
mHeader = null;
return;
}
byte[] data = a_stco.getData();
int chunk_offset = a_ftyp.getSize() + a_moov.getSize() + a_mdat.getSize();
int offset = data.length - 4; // here stco should contain only one chunk offset.
data[offset++] = (byte) ((chunk_offset >> 24) & 0xFF);
data[offset++] = (byte) ((chunk_offset >> 16) & 0xFF);
data[offset++] = (byte) ((chunk_offset >> 8) & 0xFF);
data[offset++] = (byte) (chunk_offset & 0xFF);
// create the header byte array based on the previous atoms.
byte[] header = new byte[chunk_offset]; // here chunk_offset is also the size of the header
offset = 0;
for (Atom atom : new Atom[] {a_ftyp, a_moov, a_mdat}) {
byte[] atom_bytes = atom.getBytes();
System.arraycopy(atom_bytes, 0, header, offset, atom_bytes.length);
offset += atom_bytes.length;
}
// set the correct size of the mdat atom
int size = 8 + mTotSize;
offset -= 8;
header[offset++] = (byte) ((size >> 24) & 0xFF);
header[offset++] = (byte) ((size >> 16) & 0xFF);
header[offset++] = (byte) ((size >> 8) & 0xFF);
header[offset++] = (byte) (size & 0xFF);
mHeader = header;
}
