| /* |
| * Copyright (C) 2012 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 SKIP_CUT_BUFFER_H_ |
| |
| #define SKIP_CUT_BUFFER_H_ |
| |
| #include <media/stagefright/MediaBuffer.h> |
| #include <media/stagefright/foundation/ABuffer.h> |
| |
| namespace android { |
| |
| /** |
| * utility class to cut the start and end off a stream of data in MediaBuffers |
| * |
| */ |
| class SkipCutBuffer: public RefBase { |
| public: |
| // 'skip' is the number of frames to skip from the beginning |
| // 'cut' is the number of frames to cut from the end |
| // 'num16BitChannels' is the number of channels, which are assumed to be 16 bit wide each |
| SkipCutBuffer(size_t skip, size_t cut, size_t num16Channels); |
| |
| // Submit one MediaBuffer for skipping and cutting. This may consume all or |
| // some of the data in the buffer, or it may add data to it. |
| // After this, the caller should continue processing the buffer as usual. |
| void submit(MediaBuffer *buffer); |
| void submit(const sp<ABuffer>& buffer); // same as above, but with an ABuffer |
| void clear(); |
| size_t size(); // how many bytes are currently stored in the buffer |
| |
| protected: |
| virtual ~SkipCutBuffer(); |
| |
| private: |
| void write(const char *src, size_t num); |
| size_t read(char *dst, size_t num); |
| int32_t mSkip; |
| int32_t mFrontPadding; |
| int32_t mBackPadding; |
| int32_t mWriteHead; |
| int32_t mReadHead; |
| int32_t mCapacity; |
| char* mCutBuffer; |
| DISALLOW_EVIL_CONSTRUCTORS(SkipCutBuffer); |
| }; |
| |
| } // namespace android |
| |
| #endif // OMX_CODEC_H_ |