| /* |
| * Copyright (C) 2016 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 STAGEFRIGHT_DATACONVERTER_H_ |
| #define STAGEFRIGHT_DATACONVERTER_H_ |
| |
| #include <utils/Errors.h> |
| #include <utils/RefBase.h> |
| |
| #include <media/stagefright/MediaDefs.h> |
| |
| namespace android { |
| |
| struct ABuffer; |
| |
| // DataConverter base class, defaults to memcpy |
| struct DataConverter : public RefBase { |
| virtual size_t sourceSize(size_t targetSize); // will clamp to SIZE_MAX |
| virtual size_t targetSize(size_t sourceSize); // will clamp to SIZE_MAX |
| |
| status_t convert(const sp<ABuffer> &source, sp<ABuffer> &target); |
| virtual ~DataConverter(); |
| |
| protected: |
| virtual status_t safeConvert(const sp<ABuffer> &source, sp<ABuffer> &target); |
| }; |
| |
| // SampleConverterBase uses a ratio to calculate the source and target sizes |
| // based on source and target sample sizes. |
| struct SampleConverterBase : public DataConverter { |
| virtual size_t sourceSize(size_t targetSize); |
| virtual size_t targetSize(size_t sourceSize); |
| |
| protected: |
| virtual status_t safeConvert(const sp<ABuffer> &source, sp<ABuffer> &target) = 0; |
| |
| // sourceSize = sourceSampleSize / targetSampleSize * targetSize |
| SampleConverterBase(uint32_t sourceSampleSize, uint32_t targetSampleSize) |
| : mSourceSampleSize(sourceSampleSize), |
| mTargetSampleSize(targetSampleSize) { } |
| size_t mSourceSampleSize; |
| size_t mTargetSampleSize; |
| }; |
| |
| // AudioConverter converts between audio PCM formats |
| struct AudioConverter : public SampleConverterBase { |
| // return nullptr if conversion is not needed or not supported |
| static AudioConverter *Create(AudioEncoding source, AudioEncoding target); |
| |
| protected: |
| virtual status_t safeConvert(const sp<ABuffer> &src, sp<ABuffer> &tgt); |
| |
| private: |
| AudioConverter( |
| AudioEncoding source, size_t sourceSample, |
| AudioEncoding target, size_t targetSample) |
| : SampleConverterBase(sourceSample, targetSample), |
| mFrom(source), |
| mTo(target) { } |
| AudioEncoding mFrom; |
| AudioEncoding mTo; |
| }; |
| |
| } // namespace android |
| |
| #endif |