// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_FORMATS_MP2T_ES_PARSER_ADTS_H_
#define MEDIA_FORMATS_MP2T_ES_PARSER_ADTS_H_

#include <stdint.h>

#include <memory>
#include <utility>

#include "base/compiler_specific.h"
#include "base/functional/callback.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/decrypt_config.h"
#include "media/base/media_export.h"
#include "media/formats/mp2t/es_parser.h"
#include "media/formats/mpeg/adts_stream_parser.h"
#include "media/media_buildflags.h"

namespace media {
class AudioTimestampHelper;
}

namespace media {
namespace mp2t {

class MEDIA_EXPORT EsParserAdts : public EsParser {
 public:
  using NewAudioConfigCB =
      base::RepeatingCallback<void(const AudioDecoderConfig&)>;

  EsParserAdts(NewAudioConfigCB new_audio_config_cb,
               EmitBufferCB emit_buffer_cb,
               bool sbr_in_mimetype);
  EsParserAdts(NewAudioConfigCB new_audio_config_cb,
               EmitBufferCB emit_buffer_cb,
               GetDecryptConfigCB get_decrypt_config_cb,
               EncryptionScheme init_encryption_scheme,
               bool sbr_in_mimetype);

  EsParserAdts(const EsParserAdts&) = delete;
  EsParserAdts& operator=(const EsParserAdts&) = delete;

  ~EsParserAdts() override;

  // EsParser implementation.
  void Flush() override;

 private:
  struct AdtsFrame;

  // EsParser implementation.
  bool ParseFromEsQueue() override;
  void ResetInternal() override;

  // Synchronize the stream on an ADTS syncword (consuming bytes from
  // |es_queue_| if needed).
  // Returns true when a full ADTS frame has been found: in that case
  // |adts_frame| structure is filled up accordingly.
  // Returns false otherwise (no ADTS syncword found or partial ADTS frame).
  bool LookForAdtsFrame(AdtsFrame* adts_frame);

  // Skip an ADTS frame in the ES queue.
  void SkipAdtsFrame(const AdtsFrame& adts_frame);

  // Signal any audio configuration change (if any).
  // Return false if the current audio config is not
  // a supported ADTS audio config.
  bool UpdateAudioConfiguration(base::span<const uint8_t> adts_header);

  void CalculateSubsamplesForAdtsFrame(const AdtsFrame& adts_frame,
                                       std::vector<SubsampleEntry>* subsamples);

  // Callbacks:
  // - to signal a new audio configuration,
  // - to send ES buffers.
  NewAudioConfigCB new_audio_config_cb_;
  EmitBufferCB emit_buffer_cb_;
  // - to obtain the current decrypt_config.
  GetDecryptConfigCB get_decrypt_config_cb_;
  const EncryptionScheme init_encryption_scheme_;

  // True when AAC SBR extension is signalled in the mimetype
  // (mp4a.40.5 in the codecs parameter).
  bool sbr_in_mimetype_;

  // Interpolated PTS for frames that don't have one.
  std::unique_ptr<AudioTimestampHelper> audio_timestamp_helper_;

  // Last audio config.
  AudioDecoderConfig last_audio_decoder_config_;
};

}  // namespace mp2t
}  // namespace media

#endif  // MEDIA_FORMATS_MP2T_ES_PARSER_ADTS_H_