55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "media/mp4/cenc.h"
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#include <cstring>
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#include "media/mp4/box_reader.h"
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#include "media/mp4/rcheck.h"
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namespace media {
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namespace mp4 {
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FrameCENCInfo::FrameCENCInfo() {}
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FrameCENCInfo::~FrameCENCInfo() {}
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bool FrameCENCInfo::Parse(int iv_size, BufferReader* reader) {
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const int kEntrySize = 6;
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// Mandated by CENC spec
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RCHECK(iv_size == 8 || iv_size == 16);
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memset(iv, 0, sizeof(iv));
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for (int i = 0; i < iv_size; i++)
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RCHECK(reader->Read1(&iv[i]));
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if (!reader->HasBytes(1)) return true;
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uint16 subsample_count;
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RCHECK(reader->Read2(&subsample_count) &&
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reader->HasBytes(subsample_count * kEntrySize));
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subsamples.resize(subsample_count);
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for (int i = 0; i < subsample_count; i++) {
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uint16 clear_bytes;
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uint32 cypher_bytes;
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RCHECK(reader->Read2(&clear_bytes) &&
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reader->Read4(&cypher_bytes));
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subsamples[i].clear_bytes = clear_bytes;
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subsamples[i].cypher_bytes = cypher_bytes;
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}
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return true;
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}
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size_t FrameCENCInfo::GetTotalSizeOfSubsamples() const {
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size_t size = 0;
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for (size_t i = 0; i < subsamples.size(); i++) {
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size += subsamples[i].clear_bytes + subsamples[i].cypher_bytes;
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}
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return size;
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}
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} // namespace mp4
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} // namespace media
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