1 /*
2  * Copyright (C) 2009 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 AUDIO_SOURCE_H_
18 
19 #define AUDIO_SOURCE_H_
20 
21 #include <media/AudioRecord.h>
22 #include <media/AudioSystem.h>
23 #include <media/MediaSource.h>
24 #include <media/MicrophoneInfo.h>
25 #include <media/stagefright/MediaBuffer.h>
26 #include <utils/List.h>
27 
28 #include <system/audio.h>
29 
30 #include <vector>
31 
32 namespace android {
33 
34 class AudioRecord;
35 
36 struct AudioSource : public MediaSource, public MediaBufferObserver {
37     // Note that the "channels" parameter _is_ the number of channels,
38     // _not_ a bitmask of audio_channels_t constants.
39     AudioSource(
40             audio_source_t inputSource,
41             const String16 &opPackageName,
42             uint32_t sampleRate,
43             uint32_t channels,
44             uint32_t outSampleRate = 0,
45             uid_t uid = -1,
46             pid_t pid = -1,
47             audio_port_handle_t selectedDeviceId = AUDIO_PORT_HANDLE_NONE);
48 
49     status_t initCheck() const;
50 
51     virtual status_t start(MetaData *params = NULL);
stopAudioSource52     virtual status_t stop() { return reset(); }
53     virtual sp<MetaData> getFormat();
54 
55     // Returns the maximum amplitude since last call.
56     int16_t getMaxAmplitude();
57 
58     virtual status_t read(
59             MediaBufferBase **buffer, const ReadOptions *options = NULL);
60     virtual status_t setStopTimeUs(int64_t stopTimeUs);
61 
62     status_t dataCallback(const AudioRecord::Buffer& buffer);
63     virtual void signalBufferReturned(MediaBufferBase *buffer);
64 
65     status_t setInputDevice(audio_port_handle_t deviceId);
66     status_t getRoutedDeviceId(audio_port_handle_t* deviceId);
67     status_t addAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
68     status_t removeAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
69 
70     status_t getActiveMicrophones(std::vector<media::MicrophoneInfo>* activeMicrophones);
71 
72 
73 protected:
74     virtual ~AudioSource();
75 
76 private:
77     enum {
78         kMaxBufferSize = 2048,
79 
80         // After the initial mute, we raise the volume linearly
81         // over kAutoRampDurationUs.
82         kAutoRampDurationUs = 300000,
83 
84         // This is the initial mute duration to suppress
85         // the video recording signal tone
86         kAutoRampStartUs = 0,
87     };
88 
89     Mutex mLock;
90     Condition mFrameAvailableCondition;
91     Condition mFrameEncodingCompletionCondition;
92 
93     sp<AudioRecord> mRecord;
94     status_t mInitCheck;
95     bool mStarted;
96     int32_t mSampleRate;
97     int32_t mOutSampleRate;
98 
99     bool mTrackMaxAmplitude;
100     int64_t mStartTimeUs;
101     int64_t mStopSystemTimeUs;
102     int64_t mLastFrameTimestampUs;
103     int16_t mMaxAmplitude;
104     int64_t mPrevSampleTimeUs;
105     int64_t mInitialReadTimeUs;
106     int64_t mNumFramesReceived;
107     int64_t mNumFramesSkipped;
108     int64_t mNumFramesLost;
109     int64_t mNumClientOwnedBuffers;
110     bool mNoMoreFramesToRead;
111 
112     List<MediaBuffer * > mBuffersReceived;
113 
114     void trackMaxAmplitude(int16_t *data, int nSamples);
115 
116     // This is used to raise the volume from mute to the
117     // actual level linearly.
118     void rampVolume(
119         int32_t startFrame, int32_t rampDurationFrames,
120         uint8_t *data,   size_t bytes);
121 
122     void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
123     void releaseQueuedFrames_l();
124     void waitOutstandingEncodingFrames_l();
125     status_t reset();
126 
127     AudioSource(const AudioSource &);
128     AudioSource &operator=(const AudioSource &);
129 };
130 
131 }  // namespace android
132 
133 #endif  // AUDIO_SOURCE_H_
134