ref: a6e2476e4d56cde5249ad0525afdda85f38f27da
dir: /common/mp4v2/atom_sound.cpp/
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2004. All Rights Reserved.
*
* Contributor(s):
* Bill May wmay@cisco.com
*/
#include "mp4common.h"
MP4SoundAtom::MP4SoundAtom(const char *atomid)
: MP4Atom(atomid)
{
AddReserved("reserved1", 6); /* 0 */
AddProperty( /* 1 */
new MP4Integer16Property("dataReferenceIndex"));
AddProperty( /* 2 */
new MP4Integer16Property("soundVersion"));
AddReserved( "reserved2", 6); /* 3 */
AddProperty( /* 4 */
new MP4Integer16Property("channels"));
AddProperty( /* 5 */
new MP4Integer16Property("sampleSize"));
AddProperty( /* 6 */
new MP4Integer16Property("packetSize"));
AddProperty( /* 7 */
new MP4Integer32Property("timeScale"));
if (ATOMID(atomid) == ATOMID("mp4a")) {
AddReserved("reserved3", 2); /* 8 */
ExpectChildAtom("esds", Required, OnlyOne);
ExpectChildAtom("wave", Optional, OnlyOne);
} else if (ATOMID(atomid) == ATOMID("alac")) {
AddReserved("reserved3", 2); /* 8 */
ExpectChildAtom("alac", Optional, Optional);
//AddProperty( new MP4BytesProperty("alacInfo", 36));
}
}
void MP4SoundAtom::AddProperties (uint8_t version)
{
if (version > 0) {
AddProperty( /* 8 */
new MP4Integer32Property("samplesPerPacket"));
AddProperty( /* 9 */
new MP4Integer32Property("bytesPerPacket"));
AddProperty( /* 10 */
new MP4Integer32Property("bytesPerFrame"));
AddProperty( /* 11 */
new MP4Integer32Property("bytesPerSample"));
}
if (version == 2) {
AddReserved("reserved4", 20);
}
}
void MP4SoundAtom::Generate()
{
MP4Atom::Generate();
((MP4Integer16Property*)m_pProperties[1])->SetValue(1);
// property reserved2 has non-zero fixed values
((MP4Integer16Property*)m_pProperties[2])->SetValue(0);
static const u_int8_t reserved2[6] = {
0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
};
m_pProperties[3]->SetReadOnly(false);
((MP4BytesProperty*)m_pProperties[3])->
SetValue(reserved2, sizeof(reserved2));
m_pProperties[3]->SetReadOnly(true);
((MP4Integer16Property*)m_pProperties[4])->SetValue(2);
((MP4Integer16Property*)m_pProperties[5])->SetValue(0x0010);
((MP4Integer16Property*)m_pProperties[6])->SetValue(0);
}
void MP4SoundAtom::Read()
{
MP4Atom *parent = GetParentAtom();
if (ATOMID(parent->GetType()) != ATOMID("stsd")) {
// Quicktime has an interesting thing - they'll put an mp4a atom
// which is blank inside a wave atom, which is inside an mp4a atom
// we have a mp4a inside an wave inside an mp4a - delete all properties
m_pProperties.Delete(8);
m_pProperties.Delete(7);
m_pProperties.Delete(6);
m_pProperties.Delete(5);
m_pProperties.Delete(4);
m_pProperties.Delete(3);
m_pProperties.Delete(2);
m_pProperties.Delete(1);
m_pProperties.Delete(0);
if (ATOMID(GetType()) == ATOMID("alac")) {
AddProperty(new MP4BytesProperty("decoderConfig", m_size));
ReadProperties();
}
if (m_pChildAtomInfos.Size() > 0) {
ReadChildAtoms();
}
} else {
ReadProperties(0, 3); // read first 3 properties
AddProperties(((MP4IntegerProperty *)m_pProperties[2])->GetValue());
ReadProperties(3); // continue
if (m_pChildAtomInfos.Size() > 0) {
ReadChildAtoms();
}
}
Skip();
}