Method buildReplayLayout

app/src/MDF4/Player.cpp:1066–1108

* @brief Builds a channel-to-source mapping for multi-source MDF4 playback. */

 * @brief Builds a channel-to-source mapping for multi-source MDF4 playback.
 */
void MDF4::Player::buildReplayLayout()
{
  m_sourceChannelsByIndex.clear();

  struct ChMeta {
    int uid;
    int sourceId;
  };

  QVector<ChMeta> chs;
  for (const auto& g : DataModel::ProjectModel::instance().groups()) {
    if (g.widget == QLatin1String("image"))
      continue;

    for (const auto& d : g.datasets)
      chs.append({d.uniqueId, g.sourceId});
  }

  std::unordered_map<int, int> localCounter;
  for (const auto& m : chs)
    localCounter[m.sourceId];

  m_multiSource = localCounter.size() > 1;

  std::unordered_map<int, std::unordered_map<int, int>> replay;

  if (!m_multiSource) {
    for (int ch = 0; ch < chs.size(); ++ch)
      replay[0][chs[ch].uid] = ch;
  }

  else {
    for (auto& kv : localCounter)
      kv.second = 0;

    for (int ch = 0; ch < chs.size(); ++ch) {
      m_sourceChannelsByIndex[chs[ch].sourceId].append(ch);
      replay[chs[ch].sourceId][chs[ch].uid] = localCounter[chs[ch].sourceId]++;
    }
  }

  DataModel::FrameBuilder::instance().setReplayColumnMap(std::move(replay));
}

/**
 * @brief Injects an MDF4 frame through the appropriate pipeline path.