// bin/sum-mllt-accs.cc

// Copyright 2014 LINSE/UFSC; Augusto Henrique Hentz

// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.

#include "util/common-utils.h"
#include "transform/mllt.h"

int main(int argc, char *argv[]) {
  try {
    using namespace kaldi;
    typedef kaldi::int32 int32;

    const char *usage =
        "Sum stats obtained with gmm-acc-mllt.\n"
        "Usage: sum-mllt-accs [options] <stats-out> <stats-in1> <stats-in2> ...\n";

    bool binary = true;
    ParseOptions po(usage);
    po.Register("binary", &binary, "Write accumulators in binary mode.");
    po.Read(argc, argv);

    if (po.NumArgs() < 2) {
      po.PrintUsage();
      exit(1);
    }

    MlltAccs mllt_accs;
    std::string stats_out_filename = po.GetArg(1);

    for (int32 i = 2; i <= po.NumArgs(); i++) {
      bool binary_in, add = true;
      Input ki(po.GetArg(i), &binary_in);
      mllt_accs.Read(ki.Stream(), binary_in, add);
    }

    Output ko(stats_out_filename, binary);
    mllt_accs.Write(ko.Stream(), binary);
    return 0;
  } catch(const std::exception &e) {
    std::cerr << e.what();
    return -1;
  }
}