1 /* 2 * Copyright (C) 2012 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 SKIP_CUT_BUFFER_H_ 18 19 #define SKIP_CUT_BUFFER_H_ 20 21 #include <media/MediaCodecBuffer.h> 22 #include <media/stagefright/MediaBuffer.h> 23 #include <media/stagefright/foundation/ABuffer.h> 24 25 namespace android { 26 27 /** 28 * utility class to cut the start and end off a stream of data in MediaBuffers 29 * 30 */ 31 class SkipCutBuffer: public RefBase { 32 public: 33 // 'skip' is the number of frames to skip from the beginning 34 // 'cut' is the number of frames to cut from the end 35 // 'num16BitChannels' is the number of channels, which are assumed to be 16 bit wide each 36 SkipCutBuffer(size_t skip, size_t cut, size_t num16Channels); 37 38 // Submit one MediaBuffer for skipping and cutting. This may consume all or 39 // some of the data in the buffer, or it may add data to it. 40 // After this, the caller should continue processing the buffer as usual. 41 void submit(MediaBuffer *buffer); 42 void submit(const sp<ABuffer>& buffer); // same as above, but with an ABuffer 43 void submit(const sp<MediaCodecBuffer>& buffer); // same as above, but with an ABuffer 44 void clear(); 45 size_t size(); // how many bytes are currently stored in the buffer 46 47 protected: 48 virtual ~SkipCutBuffer(); 49 50 private: 51 void write(const char *src, size_t num); 52 size_t read(char *dst, size_t num); 53 template <typename T> 54 void submitInternal(const sp<T>& buffer); 55 int32_t mSkip; 56 int32_t mFrontPadding; 57 int32_t mBackPadding; 58 int32_t mWriteHead; 59 int32_t mReadHead; 60 int32_t mCapacity; 61 char* mCutBuffer; 62 DISALLOW_EVIL_CONSTRUCTORS(SkipCutBuffer); 63 }; 64 65 } // namespace android 66 67 #endif // OMX_CODEC_H_ 68