1 /* 2 * Copyright (C) 2016 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 STAGEFRIGHT_DATACONVERTER_H_ 18 #define STAGEFRIGHT_DATACONVERTER_H_ 19 20 #include <utils/Errors.h> 21 #include <utils/RefBase.h> 22 23 #include <media/stagefright/MediaDefs.h> 24 25 namespace android { 26 27 class MediaCodecBuffer; 28 29 // DataConverter base class, defaults to memcpy 30 struct DataConverter : public RefBase { 31 virtual size_t sourceSize(size_t targetSize); // will clamp to SIZE_MAX 32 virtual size_t targetSize(size_t sourceSize); // will clamp to SIZE_MAX 33 34 status_t convert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target); 35 virtual ~DataConverter(); 36 37 protected: 38 virtual status_t safeConvert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target); 39 }; 40 41 // SampleConverterBase uses a ratio to calculate the source and target sizes 42 // based on source and target sample sizes. 43 struct SampleConverterBase : public DataConverter { 44 virtual size_t sourceSize(size_t targetSize); 45 virtual size_t targetSize(size_t sourceSize); 46 47 protected: 48 virtual status_t safeConvert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target) = 0; 49 50 // sourceSize = sourceSampleSize / targetSampleSize * targetSize 51 SampleConverterBase(uint32_t sourceSampleSize, uint32_t targetSampleSize) 52 : mSourceSampleSize(sourceSampleSize), 53 mTargetSampleSize(targetSampleSize) { } 54 size_t mSourceSampleSize; 55 size_t mTargetSampleSize; 56 }; 57 58 // AudioConverter converts between audio PCM formats 59 struct AudioConverter : public SampleConverterBase { 60 // return nullptr if conversion is not needed or not supported 61 static AudioConverter *Create(AudioEncoding source, AudioEncoding target); 62 63 protected: 64 virtual status_t safeConvert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target); 65 66 private: 67 AudioConverter( 68 AudioEncoding source, size_t sourceSample, 69 AudioEncoding target, size_t targetSample) 70 : SampleConverterBase(sourceSample, targetSample), 71 mFrom(source), 72 mTo(target) { } 73 AudioEncoding mFrom; 74 AudioEncoding mTo; 75 }; 76 77 } // namespace android 78 79 #endif 80
