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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/mp4/cenc.h"
#include "media/mp4/box_reader.h"
#include "media/mp4/rcheck.h"
namespace media {
namespace mp4 {
FrameCENCInfo::FrameCENCInfo() {}
FrameCENCInfo::~FrameCENCInfo() {}
bool FrameCENCInfo::Parse(int iv_size, BufferReader* reader) {
const int kEntrySize = 6;
// Mandated by CENC spec
RCHECK(iv_size == 8 || iv_size == 16);
iv.resize(iv_size);
uint16 subsample_count;
RCHECK(reader->ReadVec(&iv, iv_size) &&
reader->Read2(&subsample_count) &&
reader->HasBytes(subsample_count * kEntrySize));
subsamples.resize(subsample_count);
for (int i = 0; i < subsample_count; i++) {
RCHECK(reader->Read2(&subsamples[i].clear_size) &&
reader->Read4(&subsamples[i].encrypted_size));
}
return true;
}
size_t FrameCENCInfo::GetTotalSize() const {
size_t size = 0;
for (size_t i = 0; i < subsamples.size(); i++) {
size += subsamples[i].clear_size + subsamples[i].encrypted_size;
}
return size;
}
} // namespace mp4
} // namespace media
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