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/*
* 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 bytes to skip from the beginning
// 'cut' is the number of bytes to cut from the end
SkipCutBuffer(int32_t skip, int32_t cut);
// 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_
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