1 /*
2  * Copyright 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef MMC_MMC_INTERFACE_MMC_INTERFACE_H_
18 #define MMC_MMC_INTERFACE_MMC_INTERFACE_H_
19 
20 #include <stdint.h>
21 
22 #include "mmc/proto/mmc_config.pb.h"
23 
24 namespace mmc {
25 
26 // An abstract interface representing either an encoder or a decoder.
27 class MmcInterface {
28  public:
29   virtual ~MmcInterface() = default;
30 
31   // Builds and configures the encoder/decoder instance.
32   //
33   // Returns:
34   //   Input frame size accepted by the transcoder, if init succeeded.
35   //   Negative errno on error, otherwise.
36   virtual int init(ConfigParam config) = 0;
37 
38   // Resets the encoder/decoder instance.
39   virtual void cleanup() = 0;
40 
41   // Transcodes data in |i_buf|, and stores the result in |o_buf|.
42   //
43   // Returns:
44   //   Transcoded data length, if transcode succeeded.
45   //   Negative errno on error, otherwise.
46   virtual int transcode(uint8_t* i_buf, int i_len, uint8_t* o_buf,
47                         int o_len) = 0;
48 };
49 
50 }  // namespace mmc
51 
52 #endif  // MMC_MMC_INTERFACE_MMC_INTERFACE_H_
53