86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef MEDIA_FORMATS_MP4_ENCRYPTING_FRAGMENTER_H_
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#define MEDIA_FORMATS_MP4_ENCRYPTING_FRAGMENTER_H_
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#include "media/formats/mp4/fragmenter.h"
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namespace media {
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class AesCtrEncryptor;
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struct EncryptionKey;
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namespace mp4 {
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/// EncryptingFragmenter generates MP4 fragments with sample encrypted.
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class EncryptingFragmenter : public Fragmenter {
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public:
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/// @param traf points to a TrackFragment box.
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/// @param normalize_presentation_timestamp defines whether PTS should be
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/// normalized to start from zero.
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/// @param encryption_key contains the encryption parameters.
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/// @param clear_time specifies clear lead duration in units of the current
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/// track's timescale.
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/// @param nalu_length_size specifies the size of NAL unit length, in bytes,
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/// for subsample encryption.
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EncryptingFragmenter(TrackFragment* traf,
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bool normalize_presentation_timestamp,
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scoped_ptr<EncryptionKey> encryption_key,
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int64 clear_time,
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uint8 nalu_length_size);
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virtual ~EncryptingFragmenter();
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/// @name Fragmenter implementation overrides.
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/// @{
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virtual Status AddSample(scoped_refptr<MediaSample> sample) OVERRIDE;
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virtual Status InitializeFragment(int64 first_sample_dts) OVERRIDE;
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virtual void FinalizeFragment() OVERRIDE;
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/// @}
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protected:
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/// Prepare current fragment for encryption.
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/// @return OK on success, an error status otherwise.
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virtual Status PrepareFragmentForEncryption(bool enable_encryption);
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/// Finalize current fragment for encryption.
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virtual void FinalizeFragmentForEncryption();
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/// Create the encryptor for the internal encryption key. The existing
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/// encryptor will be reset if it is not NULL.
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/// @return OK on success, an error status otherwise.
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Status CreateEncryptor();
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EncryptionKey* encryption_key() { return encryption_key_.get(); }
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AesCtrEncryptor* encryptor() { return encryptor_.get(); }
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void set_encryption_key(scoped_ptr<EncryptionKey> encryption_key) {
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encryption_key_ = encryption_key.Pass();
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}
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private:
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void EncryptBytes(uint8* data, uint32 size);
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Status EncryptSample(scoped_refptr<MediaSample> sample);
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// Should we enable subsample encryption?
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bool IsSubsampleEncryptionRequired() { return nalu_length_size_ != 0; }
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scoped_ptr<EncryptionKey> encryption_key_;
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scoped_ptr<AesCtrEncryptor> encryptor_;
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// If this stream contains AVC, subsample encryption specifies that the size
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// and type of NAL units remain unencrypted. This field specifies the size of
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// the size field. Can be 1, 2 or 4 bytes.
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const uint8 nalu_length_size_;
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int64 clear_time_;
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DISALLOW_COPY_AND_ASSIGN(EncryptingFragmenter);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_FORMATS_MP4_ENCRYPTING_FRAGMENTER_H_
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