1 /*
2  * Copyright (C) 2017 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 #ifndef ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
17 #define ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
18 
19 #include <stdint.h>
20 #include <aaudio/AAudio.h>
21 
22 #include "binding/AAudioServiceInterface.h"
23 #include "client/AudioStreamInternal.h"
24 
25 using android::sp;
26 using android::IAAudioService;
27 
28 namespace aaudio {
29 
30 class AudioStreamInternalCapture : public AudioStreamInternal {
31 public:
32     AudioStreamInternalCapture(AAudioServiceInterface  &serviceInterface, bool inService = false);
33     virtual ~AudioStreamInternalCapture();
34 
35     aaudio_result_t read(void *buffer,
36                          int32_t numFrames,
37                          int64_t timeoutNanoseconds) override;
38 
39     int64_t getFramesRead() override;
40     int64_t getFramesWritten() override;
41 
42     void *callbackLoop() override;
43 
getDirection()44     aaudio_direction_t getDirection() const override {
45         return AAUDIO_DIRECTION_INPUT;
46     }
47 protected:
48 
49 /**
50  * Low level data processing that will not block. It will just read or write as much as it can.
51  *
52  * It passes back a recommended time to wake up if wakeTimePtr is not NULL.
53  *
54  * @return the number of frames processed or a negative error code.
55  */
56     aaudio_result_t processDataNow(void *buffer,
57                                    int32_t numFrames,
58                                    int64_t currentTimeNanos,
59                                    int64_t *wakeTimePtr) override;
60 
61 private:
62     /*
63      * Asynchronous read with data conversion.
64      * @param buffer
65      * @param numFrames
66      * @return frames written or negative error
67      */
68     aaudio_result_t readNowWithConversion(void *buffer, int32_t numFrames);
69 
70     int64_t       mLastFramesWritten = 0; // used to prevent retrograde motion
71 };
72 
73 } /* namespace aaudio */
74 
75 #endif //ANDROID_AAUDIO_AUDIO_STREAM_INTERNAL_CAPTURE_H
76