diff options
Diffstat (limited to 'media/libstagefright/binding/SinfParser.cpp')
-rw-r--r-- | media/libstagefright/binding/SinfParser.cpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/media/libstagefright/binding/SinfParser.cpp b/media/libstagefright/binding/SinfParser.cpp new file mode 100644 index 000000000..5cf3aa553 --- /dev/null +++ b/media/libstagefright/binding/SinfParser.cpp @@ -0,0 +1,72 @@ +/* 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); +} + +} |