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