Floss: define MMC interface

/*

 * Copyright 2023 The Android Open Source Project

 *

 * 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 MMC_MMC_INTERFACE_MMC_INTERFACE_H_

#define MMC_MMC_INTERFACE_MMC_INTERFACE_H_

#include <stdint.h>

#include "mmc/proto/mmc_config.pb.h"

namespace mmc {

// An abstract interface representing either an encoder or a decoder.

class MmcInterface {

 public:

  virtual ~MmcInterface() = default;

  // Builds and configures the encoder/decoder instance.

  //

  // Returns:

  //   Input frame size accepted by the transcoder, if init succeeded.

  //   Negative errno on error, otherwise.

  virtual int init(ConfigParam config) = 0;

  // Resets the encoder/decoder instance.

  virtual void cleanup() = 0;

  // Transcodes data in |i_buf|, and stores the result in |o_buf|.

  //

  // Returns:

  //   Transcoded data length, if transcode succeeded.

  //   Negative errno on error, otherwise.

  virtual int transcode(uint8_t* i_buf, int i_len, uint8_t* o_buf,

                        int o_len) = 0;

};

}  // namespace mmc

#endif  // MMC_MMC_INTERFACE_MMC_INTERFACE_H_