xbmc/cores/AudioEngine/Utils/PackerMAT.h

   1 /*
   2  *  Copyright (C) 2024 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #pragma once
  10
  11 #include <deque>
  12 #include <stdint.h>
  13 #include <vector>
  14
  15 enum class Type
  16 {
  17   PADDING,
  18   DATA,
  19 };
  20
  21 class CPackerMAT
  22 {
  23 public:
  24   CPackerMAT();
  25   ~CPackerMAT() = default;
  26
  27   bool PackTrueHD(const uint8_t* data, int size);
  28   std::vector<uint8_t> GetOutputFrame();
  29
  30 private:
  31   struct MATState
  32   {
  33     bool init; // differentiates the first header
  34
  35     // audio_sampling_frequency:
  36     //  0 -> 48 kHz
  37     //  1 -> 96 kHz
  38     //  2 -> 192 kHz
  39     //  8 -> 44.1 kHz
  40     //  9 -> 88.2 kHz
  41     // 10 -> 176.4 kHz
  42     int ratebits;
  43
  44     // input timing of previous audio unit used to calculate padding bytes
  45     uint16_t prevFrametime;
  46     bool prevFrametimeValid;
  47
  48     uint32_t matFramesize; // size in bytes of current MAT frame
  49     uint32_t prevMatFramesize; // size in bytes of previous MAT frame
  50
  51     uint32_t padding; // padding bytes pending to write
  52   };
  53
  54   void WriteHeader();
  55   void WritePadding();
  56   void AppendData(const uint8_t* data, int size, Type type);
  57   uint32_t GetCount() const { return m_bufferCount; }
  58   int FillDataBuffer(const uint8_t* data, int size, Type type);
  59   void FlushPacket();
  60
  61   MATState m_state{};
  62
  63   uint32_t m_bufferCount{0};
  64   std::vector<uint8_t> m_buffer;
  65   std::deque<std::vector<uint8_t>> m_outputQueue;
  66 };