Function load

plugins/wasi_nn/wasinn_piper.cpp:236–280

}

Expect<WASINN::ErrNo> load(WASINN::WasiNNEnvironment &Env,
                           Span<const Span<uint8_t>> Builders, WASINN::Device,
                           uint32_t &GraphId) noexcept {
  // The graph builder length must be 1.
  if (Builders.size() != 1) {
    spdlog::error(
        "[WASI-NN] Piper backend: Wrong GraphBuilder Length {:d}, expect 1"sv,
        Builders.size());
    return WASINN::ErrNo::InvalidArgument;
  }

  // Add a new graph.
  uint32_t const GId = Env.newGraph(Backend::Piper);
  auto &GraphRef = Env.NNGraph[GId].get<Graph>();
  GraphRef.Config = std::make_unique<RunConfig>();
  auto String = std::string{Builders[0].begin(), Builders[0].end()};
  if (auto Res = parseRunConfig(*GraphRef.Config, String);
      Res != WASINN::ErrNo::Success) {
    Env.deleteGraph(GId);
    spdlog::error("[WASI-NN] Piper backend: Failed to parse run config."sv);
    return Res;
  }

  std::string EspeakPath = "";
  if (GraphRef.Config->ESpeakDataPath) {
    EspeakPath = GraphRef.Config->ESpeakDataPath->string();
  }

  piper_synthesizer *Synth =
      piper_create(GraphRef.Config->ModelPath.string().c_str(),
                   GraphRef.Config->ModelConfigPath.string().c_str(),
                   EspeakPath.empty() ? nullptr : EspeakPath.c_str());

  if (!Synth) {
    spdlog::error(
        "[WASI-NN] Piper backend: Failed to create piper synthesizer."sv);
    Env.deleteGraph(GId);
    return WASINN::ErrNo::InvalidArgument;
  }

  GraphRef.Synth = std::unique_ptr<piper_synthesizer, PiperDeleter>(Synth);
  GraphId = GId;
  Env.NNGraph[GId].setReady();
  return WASINN::ErrNo::Success;
}

Expect<WASINN::ErrNo> initExecCtx(WASINN::WasiNNEnvironment &Env,
                                  uint32_t GraphId,