135 lines
4.3 KiB
C++
135 lines
4.3 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_FRAGMENTER_H_
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#define MEDIA_FORMATS_MP4_FRAGMENTER_H_
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#include <vector>
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#include "base/memory/ref_counted.h"
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#include "base/memory/scoped_ptr.h"
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#include "media/base/status.h"
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namespace media {
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class AesCtrEncryptor;
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class BufferWriter;
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class MediaSample;
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struct EncryptionKey;
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namespace mp4 {
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struct MovieFragment;
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struct SegmentReference;
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struct TrackFragment;
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/// Fragmenter is responsible for the generation of MP4 fragments, i.e. traf
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/// box and corresponding mdat box. The samples are also encrypted if encryption
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/// is requested.
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class 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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Fragmenter(TrackFragment* traf,
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bool normalize_presentation_timestamp);
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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 NAL unit length size, in bytes, for subsample
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/// encryption.
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Fragmenter(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 ~Fragmenter();
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/// Add a sample to the fragmenter.
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Status AddSample(scoped_refptr<MediaSample> sample);
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/// Initialize the fragment with default data.
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/// @return OK on success, an error status otherwise.
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Status InitializeFragment();
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/// Finalize and optimize the fragment.
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void FinalizeFragment();
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/// Fill @a reference with current fragment information.
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void GenerateSegmentReference(SegmentReference* reference);
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uint64 fragment_duration() const { return fragment_duration_; }
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uint64 first_sap_time() const { return first_sap_time_; }
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uint64 earliest_presentation_time() const {
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return earliest_presentation_time_;
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}
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bool fragment_finalized() const { return fragment_finalized_; }
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BufferWriter* data() { return data_.get(); }
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BufferWriter* aux_data() { return aux_data_.get(); }
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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();
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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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TrackFragment* traf() { return traf_; }
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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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// Check if the current fragment starts with SAP.
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bool StartsWithSAP();
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TrackFragment* traf_;
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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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const int64 clear_time_;
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bool fragment_finalized_;
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uint64 fragment_duration_;
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bool normalize_presentation_timestamp_;
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int64 presentation_start_time_;
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int64 earliest_presentation_time_;
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int64 first_sap_time_;
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scoped_ptr<BufferWriter> data_;
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scoped_ptr<BufferWriter> aux_data_;
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DISALLOW_COPY_AND_ASSIGN(Fragmenter);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_FORMATS_MP4_FRAGMENTER_H_
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