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 ANDROID_AUDIO_LIBSNDFILE_SOURCE_H
18 #define ANDROID_AUDIO_LIBSNDFILE_SOURCE_H
19 
20 #include <media/nbaio/NBAIO.h>
21 
22 #include "sndfile.h"
23 
24 // Implementation of NBAIO_Source that wraps a libsndfile opened in SFM_READ mode
25 
26 namespace android {
27 
28 class LibsndfileSource : public NBAIO_Source {
29 
30 public:
31     // If 'loop' is true and it permits seeking, then we'll act as an infinite source
32     LibsndfileSource(SNDFILE *sndfile, const SF_INFO &sfinfo, bool loop = false);
33     virtual ~LibsndfileSource();
34 
35     // NBAIO_Port interface
36 
37     //virtual ssize_t negotiate(const NBAIO_Format offers[], size_t numOffers,
38     //                          NBAIO_Format counterOffers[], size_t& numCounterOffers);
39     //virtual NBAIO_Format format() const;
40 
41     // NBAIO_Source interface
42 
43     //virtual size_t framesRead() const;
44     //virtual size_t framesOverrun();
45     //virtual size_t overruns();
46     virtual ssize_t availableToRead();
47     virtual ssize_t read(void *buffer, size_t count);
48     //virtual ssize_t readVia(readVia_t via, size_t total, void *user, size_t block);
49 
50 private:
51     SNDFILE *   mSndfile;
52     sf_count_t  mEstimatedFramesUntilEOF;
53     bool        mLooping;
54     bool        mReadAnyFramesThisLoopCycle;
55 };
56 
57 }   // namespace android
58 
59 #endif  // ANDROID_AUDIO_LIBSNDFILE_SOURCE_H
60