123 lines
3.8 KiB
C++
123 lines
3.8 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 <memory>
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#include <vector>
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#include "packager/base/logging.h"
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#include "packager/media/base/status.h"
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namespace shaka {
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namespace media {
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class BufferWriter;
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class MediaSample;
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class StreamInfo;
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namespace mp4 {
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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.
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class 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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Fragmenter(std::shared_ptr<StreamInfo> info, TrackFragment* traf);
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virtual ~Fragmenter();
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/// Add a sample to the fragmenter.
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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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virtual Status AddSample(std::shared_ptr<MediaSample> sample);
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/// Initialize the fragment with default data.
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/// @param first_sample_dts specifies the decoding timestamp for the first
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/// sample for this fragment.
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/// @return OK on success, an error status otherwise.
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virtual Status InitializeFragment(int64_t first_sample_dts);
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/// Finalize and optimize the fragment.
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virtual 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_t fragment_duration() const { return fragment_duration_; }
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uint64_t first_sap_time() const { return first_sap_time_; }
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uint64_t earliest_presentation_time() const {
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return earliest_presentation_time_;
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}
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bool fragment_initialized() const { return fragment_initialized_; }
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bool fragment_finalized() const { return fragment_finalized_; }
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BufferWriter* data() { return data_.get(); }
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/// Set the flag use_decoding_timestamp_in_timeline, which if set to true, use
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/// decoding timestamp instead of presentation timestamp in media timeline,
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/// which is needed to workaround a Chromium bug that decoding timestamp is
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/// used in buffered range, https://crbug.com/398130.
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void set_use_decoding_timestamp_in_timeline(
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bool use_decoding_timestamp_in_timeline) {
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use_decoding_timestamp_in_timeline_ = use_decoding_timestamp_in_timeline;
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}
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protected:
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TrackFragment* traf() { return traf_; }
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/// Optimize sample entries table. If all values in @a entries are identical,
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/// then @a entries is cleared and the value is assigned to @a default_value;
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/// otherwise it is a NOP. Return true if the table is optimized.
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template <typename T>
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bool OptimizeSampleEntries(std::vector<T>* entries, T* default_value);
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private:
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// Check if the current fragment starts with SAP.
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bool StartsWithSAP();
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bool use_decoding_timestamp_in_timeline_;
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TrackFragment* traf_;
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uint64_t seek_preroll_;
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bool fragment_initialized_;
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bool fragment_finalized_;
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uint64_t fragment_duration_;
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int64_t earliest_presentation_time_;
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int64_t first_sap_time_;
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std::unique_ptr<BufferWriter> data_;
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DISALLOW_COPY_AND_ASSIGN(Fragmenter);
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};
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template <typename T>
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bool Fragmenter::OptimizeSampleEntries(std::vector<T>* entries,
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T* default_value) {
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DCHECK(entries);
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DCHECK(default_value);
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DCHECK(!entries->empty());
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typename std::vector<T>::const_iterator it = entries->begin();
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T value = *it;
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for (; it < entries->end(); ++it)
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if (value != *it)
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return false;
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// Clear |entries| if it contains only one value.
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entries->clear();
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*default_value = value;
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return true;
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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_FRAGMENTER_H_
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