dct_double.h

/*
 * Copyright 2016 Google Inc.
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef KNUSPERLI_DCT_DOUBLE_H_
#define KNUSPERLI_DCT_DOUBLE_H_

namespace knusperli {

// Performs in-place floating point 8x8 DCT on block[0..63].
// Note that the DCT used here is the DCT-2 with the first term multiplied by
// 1/sqrt(2) and the result scaled by 1/2.
void ComputeBlockDCTDouble(double block[64]);

// Performs in-place floating point 8x8 inverse DCT on block[0..63].
void ComputeBlockIDCTDouble(double block[64]);

}  // namespace knusperli

#endif  // KNUSPERLI_DCT_DOUBLE_H_