Converter.h revision 7f06639d375c44f260e00aa5e18cd883624b38bf 
1/*
2 * Copyright 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 CONVERTER_H_
18
19#define CONVERTER_H_
20
21#include <media/stagefright/foundation/AHandler.h>
22
23namespace android {
24
25struct ABuffer;
26struct MediaCodec;
27
28// Utility class that receives media access units and converts them into
29// media access unit of a different format.
30// Right now this'll convert raw video into H.264 and raw audio into AAC.
31struct Converter : public AHandler {
32    Converter(
33            const sp<AMessage> &notify,
34            const sp<ALooper> &codecLooper,
35            const sp<AMessage> &format);
36
37    status_t initCheck() const;
38
39    size_t getInputBufferCount() const;
40
41    sp<AMessage> getOutputFormat() const;
42
43    void feedAccessUnit(const sp<ABuffer> &accessUnit);
44    void signalEOS();
45
46    enum {
47        kWhatAccessUnit,
48        kWhatEOS,
49        kWhatError,
50    };
51
52protected:
53    virtual ~Converter();
54    virtual void onMessageReceived(const sp<AMessage> &msg);
55
56private:
57    enum {
58        kWhatFeedAccessUnit,
59        kWhatInputEOS,
60        kWhatDoMoreWork
61    };
62
63    status_t mInitCheck;
64    sp<AMessage> mNotify;
65    sp<ALooper> mCodecLooper;
66    sp<AMessage> mInputFormat;
67    sp<AMessage> mOutputFormat;
68
69    sp<MediaCodec> mEncoder;
70
71    Vector<sp<ABuffer> > mEncoderInputBuffers;
72    Vector<sp<ABuffer> > mEncoderOutputBuffers;
73
74    List<size_t> mAvailEncoderInputIndices;
75
76    List<sp<ABuffer> > mInputBufferQueue;
77
78    bool mDoMoreWorkPending;
79
80    status_t initEncoder();
81
82    status_t feedEncoderInputBuffers();
83
84    void scheduleDoMoreWork();
85    status_t doMoreWork();
86
87    void notifyError(status_t err);
88
89    DISALLOW_EVIL_CONSTRUCTORS(Converter);
90};
91
92}  // namespace android
93
94#endif  // CONVERTER_H_
95
96