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/stagefright/MediaBuffer.h>
22#include <media/stagefright/foundation/ABuffer.h>
23
24namespace android {
25
26/**
27 * utility class to cut the start and end off a stream of data in MediaBuffers
28 *
29 */
30class SkipCutBuffer: public RefBase {
31 public:
32    // 'skip' is the number of bytes to skip from the beginning
33    // 'cut' is the number of bytes to cut from the end
34    SkipCutBuffer(int32_t skip, int32_t cut);
35
36    // Submit one MediaBuffer for skipping and cutting. This may consume all or
37    // some of the data in the buffer, or it may add data to it.
38    // After this, the caller should continue processing the buffer as usual.
39    void submit(MediaBuffer *buffer);
40    void submit(const sp<ABuffer>& buffer);    // same as above, but with an ABuffer
41    void clear();
42    size_t size(); // how many bytes are currently stored in the buffer
43
44 protected:
45    virtual ~SkipCutBuffer();
46
47 private:
48    void write(const char *src, size_t num);
49    size_t read(char *dst, size_t num);
50    int32_t mFrontPadding;
51    int32_t mBackPadding;
52    int32_t mWriteHead;
53    int32_t mReadHead;
54    int32_t mCapacity;
55    char* mCutBuffer;
56    DISALLOW_EVIL_CONSTRUCTORS(SkipCutBuffer);
57};
58
59}  // namespace android
60
61#endif  // OMX_CODEC_H_
62