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 #ifndef AAC_BQ_TO_PCM_H_
18 #define AAC_BQ_TO_PCM_H_
19 
20 #include "android/android_AudioToCbRenderer.h"
21 #include "android/BufferQueueSource.h"
22 #include "android/include/AacAdtsExtractor.h"
23 
24 //--------------------------------------------------------------------------------------------------
25 namespace android {
26 
27 // Class to receive AAC ADTS data through an Android Buffer Queue, decode it and output
28 // the PCM samples through a registered callback (just like its superclass, AudioToCbRenderer).
29 // The implementation mainly overrides AudioSfDecoder::onPrepare() for the specificities
30 // of the data source creation, but all other behavior remains the same (e.g. PCM format metadata)
31 
32 class AacBqToPcmCbRenderer : public AudioToCbRenderer
33 {
34 public:
35 
36     AacBqToPcmCbRenderer(const AudioPlayback_Parameters* params,
37             IAndroidBufferQueue *androidBufferQueue);
38     virtual ~AacBqToPcmCbRenderer();
39 
40     // verifies the given memory starts and ends on ADTS frame boundaries.
41     // This is for instance used whenever ADTS data is being enqueued through an
42     // SL / XA AndroidBufferQueue interface so only parseable ADTS data goes in
43     // the buffer queue, and no ADTS frame is stored across two buffers.
44     static SLresult validateBufferStartEndOnFrameBoundaries(void* data, size_t size);
45 
46 protected:
47 
48     // Async event handlers (called from GenericPlayer's event loop)
49     virtual void onPrepare();
50 
51 
52 private:
53     const sp<BufferQueueSource> mBqSource;
54 
55 private:
56     DISALLOW_EVIL_CONSTRUCTORS(AacBqToPcmCbRenderer);
57 
58 };
59 
60 } // namespace android
61 
62 #endif //AAC_BQ_TO_PCM_H_
63