83 lines
1.6 KiB
C++
83 lines
1.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Unused.h"
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#include "mp4_demuxer/SinfParser.h"
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#include "mp4_demuxer/AtomType.h"
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#include "mp4_demuxer/Box.h"
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namespace mp4_demuxer {
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Sinf::Sinf(Box& aBox)
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: mDefaultIVSize(0)
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, mDefaultEncryptionType()
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{
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SinfParser parser(aBox);
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if (parser.GetSinf().IsValid()) {
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*this = parser.GetSinf();
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}
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}
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SinfParser::SinfParser(Box& aBox)
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{
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for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
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if (box.IsType("schm")) {
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ParseSchm(box);
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} else if (box.IsType("schi")) {
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ParseSchi(box);
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}
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}
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}
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void
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SinfParser::ParseSchm(Box& aBox)
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{
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BoxReader reader(aBox);
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if (reader->Remaining() < 8) {
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return;
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}
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uint32_t type;
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if (!reader->Skip(4) ||
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!reader->ReadU32(type)) {
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NS_WARNING("Failed to parse schm data");
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return;
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}
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mSinf.mDefaultEncryptionType = type;
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}
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void
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SinfParser::ParseSchi(Box& aBox)
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{
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for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
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if (box.IsType("tenc")) {
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ParseTenc(box);
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}
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}
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}
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void
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SinfParser::ParseTenc(Box& aBox)
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{
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BoxReader reader(aBox);
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if (reader->Remaining() < 24) {
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return;
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}
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uint32_t isEncrypted;
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const uint8_t* key;
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if (!reader->Skip(4) || // flags -- ignore
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!reader->ReadU24(isEncrypted) ||
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!reader->ReadU8(mSinf.mDefaultIVSize) ||
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!reader->Read(16, &key)) {
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NS_WARNING("Failed to parse tenc data");
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return;
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}
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memcpy(mSinf.mDefaultKeyID, key, 16);
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}
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}
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