VorbisDecoder.h revision 388379f8b4cabe7bccf280d450a6db2c3149796b 
1/*
2 * Copyright (C) 2010 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 VORBIS_DECODER_H_
18
19#define VORBIS_DECODER_H_
20
21#include <media/stagefright/MediaSource.h>
22
23struct vorbis_dsp_state;
24struct vorbis_info;
25
26namespace android {
27
28struct MediaBufferGroup;
29
30struct VorbisDecoder : public MediaSource {
31    VorbisDecoder(const sp<MediaSource> &source);
32
33    virtual status_t start(MetaData *params);
34    virtual status_t stop();
35
36    virtual sp<MetaData> getFormat();
37
38    virtual status_t read(
39            MediaBuffer **buffer, const ReadOptions *options);
40
41protected:
42    virtual ~VorbisDecoder();
43
44private:
45    enum {
46        kMaxNumSamplesPerBuffer = 8192 * 2
47    };
48
49    sp<MediaSource> mSource;
50    bool mStarted;
51
52    MediaBufferGroup *mBufferGroup;
53
54    int32_t mNumChannels;
55    int32_t mSampleRate;
56    int64_t mAnchorTimeUs;
57    int64_t mNumFramesOutput;
58
59    vorbis_dsp_state *mState;
60    vorbis_info *mVi;
61
62    int decodePacket(MediaBuffer *packet, MediaBuffer *out);
63
64    VorbisDecoder(const VorbisDecoder &);
65    VorbisDecoder &operator=(const VorbisDecoder &);
66};
67
68}  // namespace android
69
70#endif  // VORBIS_DECODER_H_
71
72