136 lines
4.6 KiB
C++
136 lines
4.6 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_SEGMENTER_H_
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#define MEDIA_FORMATS_MP4_SEGMENTER_H_
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#include <map>
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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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struct MuxerOptions;
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class BufferWriter;
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class KeySource;
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class MediaSample;
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class MediaStream;
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namespace event {
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class MuxerListener;
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} // namespace event
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namespace mp4 {
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class Fragmenter;
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struct FileType;
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struct Movie;
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struct MovieFragment;
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struct SegmentIndex;
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/// This class defines the Segmenter which is responsible for organizing
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/// fragments into segments/subsegments and package them into a MP4 file.
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/// Inherited by MultiSegmentSegmenter and SingleSegmentSegmenter.
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/// SingleSegmentSegmenter defines the Segmenter for DASH Video-On-Demand with
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/// a single segment for each media presentation while MultiSegmentSegmenter
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/// handles all other cases including DASH live profile.
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class Segmenter {
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public:
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Segmenter(const MuxerOptions& options,
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scoped_ptr<FileType> ftyp,
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scoped_ptr<Movie> moov);
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virtual ~Segmenter();
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/// Initialize the segmenter.
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/// Calling other public methods of this class without this method returning
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/// Status::OK results in an undefined behavior.
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/// @param streams contains the vector of MediaStreams to be segmented.
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/// @param encryption_key_source points to the key source which contains
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/// the encryption keys. It can be NULL to indicate that no encryption
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/// is required.
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/// @param max_sd_pixels specifies the threshold to determine whether a video
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/// track should be considered as SD or HD. If the track has more
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/// pixels per frame than max_sd_pixels, it is HD, SD otherwise.
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/// @param clear_time specifies clear lead duration in seconds.
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/// @param crypto_period_duration specifies crypto period duration in seconds.
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/// @return OK on success, an error status otherwise.
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Status Initialize(const std::vector<MediaStream*>& streams,
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event::MuxerListener* muxer_listener,
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KeySource* encryption_key_source,
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uint32 max_sd_pixels,
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double clear_lead_in_seconds,
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double crypto_period_duration_in_seconds);
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/// Finalize the segmenter.
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/// @return OK on success, an error status otherwise.
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Status Finalize();
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/// Add sample to the indicated stream.
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/// @param stream points to the stream to which the sample belongs. It cannot
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/// be NULL.
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/// @param sample points to the sample to be added.
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/// @return OK on success, an error status otherwise.
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Status AddSample(const MediaStream* stream,
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scoped_refptr<MediaSample> sample);
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/// @return true if there is an initialization range, while setting @a offset
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/// and @a size; or false if initialization range does not apply.
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virtual bool GetInitRange(size_t* offset, size_t* size) = 0;
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/// @return true if there is an index byte range, while setting @a offset
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/// and @a size; or false if index byte range does not apply.
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virtual bool GetIndexRange(size_t* offset, size_t* size) = 0;
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uint32 GetReferenceTimeScale() const;
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/// @return The total length, in seconds, of segmented media files.
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double GetDuration() const;
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protected:
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const MuxerOptions& options() const { return options_; }
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FileType* ftyp() { return ftyp_.get(); }
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Movie* moov() { return moov_.get(); }
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BufferWriter* fragment_buffer() { return fragment_buffer_.get(); }
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SegmentIndex* sidx() { return sidx_.get(); }
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event::MuxerListener* muxer_listener() { return muxer_listener_; }
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private:
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virtual Status DoInitialize() = 0;
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virtual Status DoFinalize() = 0;
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virtual Status DoFinalizeSegment() = 0;
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void InitializeSegment();
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Status FinalizeSegment();
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uint32 GetReferenceStreamId();
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Status FinalizeFragment(Fragmenter* fragment);
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const MuxerOptions& options_;
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scoped_ptr<FileType> ftyp_;
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scoped_ptr<Movie> moov_;
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scoped_ptr<MovieFragment> moof_;
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scoped_ptr<BufferWriter> fragment_buffer_;
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scoped_ptr<SegmentIndex> sidx_;
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std::vector<Fragmenter*> fragmenters_;
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std::vector<uint64> segment_durations_;
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std::map<const MediaStream*, uint32> stream_map_;
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bool segment_initialized_;
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bool end_of_segment_;
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event::MuxerListener* muxer_listener_;
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DISALLOW_COPY_AND_ASSIGN(Segmenter);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_FORMATS_MP4_SEGMENTER_H_
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