1/*
2 * Copyright (C) 2011 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#include <stdint.h>
18
19#include <utils/RefBase.h>
20#include <utils/threads.h>
21
22#include <media/stagefright/MediaSource.h>
23
24#include "AudioBufferProvider.h"
25#include "AudioResampler.h"
26
27namespace android {
28
29struct MediaBuffer;
30
31class VideoEditorSRC : public MediaSource , public AudioBufferProvider {
32
33    public:
34        VideoEditorSRC(
35            const sp<MediaSource> &source);
36
37        virtual status_t start (MetaData *params = NULL);
38        virtual status_t stop();
39        virtual sp<MetaData> getFormat();
40        virtual status_t read (
41            MediaBuffer **buffer, const ReadOptions *options = NULL);
42
43        virtual status_t getNextBuffer(Buffer* buffer);
44        virtual void releaseBuffer(Buffer* buffer);
45
46    enum { //Sampling freq
47        kFreq8000Hz = 8000,
48        kFreq11025Hz = 11025,
49        kFreq12000Hz = 12000,
50        kFreq16000Hz = 16000,
51        kFreq22050Hz = 22050,
52        kFreq240000Hz = 24000,
53        kFreq32000Hz = 32000,
54        kFreq44100 = 44100,
55        kFreq48000 = 48000,
56    };
57
58    static const uint16_t UNITY_GAIN = 0x1000;
59    static const int32_t DEFAULT_SAMPLING_FREQ = (int32_t)kFreq32000Hz;
60
61    protected :
62        virtual ~VideoEditorSRC();
63    private:
64
65        VideoEditorSRC();
66        VideoEditorSRC &operator=(const VideoEditorSRC &);
67
68        void checkAndSetResampler();
69
70        AudioResampler        *mResampler;
71        sp<MediaSource>      mSource;
72        int mChannelCnt;
73        int mSampleRate;
74        int32_t mOutputSampleRate;
75        bool mStarted;
76        sp<MetaData> mOutputFormat;
77
78        MediaBuffer* mBuffer;
79        int32_t mLeftover;
80        bool mFormatChanged;
81        bool mStopPending;
82
83        int64_t mInitialTimeStampUs;
84        int64_t mAccuOutBufferSize;
85
86        int64_t mSeekTimeUs;
87        ReadOptions::SeekMode mSeekMode;
88};
89
90} //namespce android
91
92