ts_segmenter.h

// Copyright 2016 Google LLC. 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 PACKAGER_MEDIA_FORMATS_MP2T_TS_SEGMENTER_H_
#define PACKAGER_MEDIA_FORMATS_MP2T_TS_SEGMENTER_H_
 
#include <cstdint>
#include <memory>
#include <vector>
 
#include <packager/macros/classes.h>
#include <packager/media/base/buffer_writer.h>
#include <packager/media/base/media_sample.h>
#include <packager/media/base/muxer_options.h>
#include <packager/media/base/stream_info.h>
#include <packager/media/formats/mp2t/pes_packet_generator.h>
#include <packager/media/formats/mp2t/ts_writer.h>
#include <packager/status.h>
 
namespace shaka {
namespace media {
 
class KeySource;
class MuxerListener;
 
namespace mp2t {
 
class TsSegmenter {
 public:
  // TODO(rkuroiwa): Add progress listener?
  TsSegmenter(const MuxerOptions& options, MuxerListener* listener);
  ~TsSegmenter();
 
  Status Initialize(const StreamInfo& stream_info);
 
  Status Finalize();
 
  Status AddSample(const MediaSample& sample);
 
  // TODO(kqyang): Remove the usage of segment start timestamp and duration in
  // xx_segmenter, which could cause confusions on which is the source of truth
  // as the segment start timestamp and duration could be tracked locally.
  Status FinalizeSegment(int64_t start_timestamp, int64_t duration);
 
  void InjectTsWriterForTesting(std::unique_ptr<TsWriter> writer);
 
  void InjectPesPacketGeneratorForTesting(
      std::unique_ptr<PesPacketGenerator> generator);
 
  void SetSegmentStartedForTesting(bool value);
 
  int64_t segment_start_timestamp() const { return segment_start_timestamp_; }
  BufferWriter* segment_buffer() { return &segment_buffer_; }
  void set_segment_started(bool value) { segment_started_ = value; }
  bool segment_started() const { return segment_started_; }
 
  double timescale() const { return timescale_scale_; }
  uint32_t transport_stream_timestamp_offset() const {
    return transport_stream_timestamp_offset_;
  }
 
 private:
  Status StartSegmentIfNeeded(int64_t next_pts);
 
  // Writes PES packets (carried in TsPackets) to a buffer.
  Status WritePesPackets();
 
  MuxerListener* const listener_;
 
  // Codec for the stream.
  Codec codec_ = kUnknownCodec;
  std::vector<uint8_t> audio_codec_config_;
 
  const int32_t transport_stream_timestamp_offset_ = 0;
  // Scale used to scale the input stream to TS's timesccale (which is 90000).
 
  // Used for calculating the duration in seconds fo the current segment.
  double timescale_scale_ = 1.0;
 
  std::unique_ptr<TsWriter> ts_writer_;
 
  BufferWriter segment_buffer_;
 
  // Set to true if segment_buffer_ is initialized, set to false after
  // FinalizeSegment() succeeds in ts_muxer.
  bool segment_started_ = false;
  std::unique_ptr<PesPacketGenerator> pes_packet_generator_;
 
  int64_t segment_start_timestamp_ = -1;
  DISALLOW_COPY_AND_ASSIGN(TsSegmenter);
};
 
}  // namespace mp2t
}  // namespace media
}  // namespace shaka
#endif  // PACKAGER_MEDIA_FORMATS_MP2T_TS_SEGMENTER_H_