110 lines
3.9 KiB
C++
110 lines
3.9 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 "packager/base/memory/ref_counted.h"
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#include "packager/base/memory/scoped_ptr.h"
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#include "packager/media/base/fourccs.h"
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#include "packager/media/codecs/video_slice_header_parser.h"
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#include "packager/media/codecs/vpx_parser.h"
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#include "packager/media/formats/mp4/fragmenter.h"
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namespace shaka {
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namespace media {
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class AesCryptor;
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class StreamInfo;
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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 info contains stream information.
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/// @param traf points to a TrackFragment box.
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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 protection_scheme specifies the protection scheme: 'cenc', 'cens',
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/// 'cbc1', 'cbcs'.
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/// @param crypt_byte_block indicates number of encrypted blocks (16-byte) in
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/// pattern based encryption.
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/// @param skip_byte_block indicates number of unencrypted blocks (16-byte)
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/// in pattern based encryption.
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EncryptingFragmenter(scoped_refptr<StreamInfo> info,
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TrackFragment* traf,
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scoped_ptr<EncryptionKey> encryption_key,
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int64_t clear_time,
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FourCC protection_scheme,
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uint8_t crypt_byte_block,
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uint8_t skip_byte_block);
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~EncryptingFragmenter() override;
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/// @name Fragmenter implementation overrides.
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/// @{
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Status AddSample(scoped_refptr<MediaSample> sample) override;
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Status InitializeFragment(int64_t first_sample_dts) override;
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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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const EncryptionKey* encryption_key() const { return encryption_key_.get(); }
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AesCryptor* encryptor() { return encryptor_.get(); }
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FourCC protection_scheme() const { return protection_scheme_; }
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uint8_t crypt_byte_block() const { return crypt_byte_block_; }
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uint8_t skip_byte_block() const { return skip_byte_block_; }
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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_t* data, uint32_t 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();
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scoped_refptr<StreamInfo> info_;
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scoped_ptr<EncryptionKey> encryption_key_;
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scoped_ptr<AesCryptor> 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 function returns the size of
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// the size field in bytes. Can be 1, 2 or 4 bytes.
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const uint8_t nalu_length_size_;
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const VideoCodec video_codec_;
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int64_t clear_time_;
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const FourCC protection_scheme_;
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const uint8_t crypt_byte_block_;
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const uint8_t skip_byte_block_;
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scoped_ptr<VPxParser> vpx_parser_;
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scoped_ptr<VideoSliceHeaderParser> header_parser_;
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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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} // namespace shaka
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#endif // MEDIA_FORMATS_MP4_ENCRYPTING_FRAGMENTER_H_
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