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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Unused.h"
#include "mp4_demuxer/SinfParser.h"
#include "mp4_demuxer/AtomType.h"
#include "mp4_demuxer/Box.h"
namespace mp4_demuxer {
Sinf::Sinf(Box& aBox)
: mDefaultIVSize(0)
, mDefaultEncryptionType()
{
SinfParser parser(aBox);
if (parser.GetSinf().IsValid()) {
*this = parser.GetSinf();
}
}
SinfParser::SinfParser(Box& aBox)
{
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("schm")) {
ParseSchm(box);
} else if (box.IsType("schi")) {
ParseSchi(box);
}
}
}
void
SinfParser::ParseSchm(Box& aBox)
{
BoxReader reader(aBox);
if (reader->Remaining() < 8) {
return;
}
mozilla::Unused << reader->ReadU32(); // flags -- ignore
mSinf.mDefaultEncryptionType = reader->ReadU32();
}
void
SinfParser::ParseSchi(Box& aBox)
{
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("tenc")) {
ParseTenc(box);
}
}
}
void
SinfParser::ParseTenc(Box& aBox)
{
BoxReader reader(aBox);
if (reader->Remaining() < 24) {
return;
}
mozilla::Unused << reader->ReadU32(); // flags -- ignore
uint32_t isEncrypted = reader->ReadU24();
mSinf.mDefaultIVSize = reader->ReadU8();
memcpy(mSinf.mDefaultKeyID, reader->Read(16), 16);
}
}
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