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             audio_microphone_direction_t selectedMicDirection = MIC_DIRECTION_UNSPECIFIED,
49             float selectedMicFieldDimension = MIC_FIELD_DIMENSION_NORMAL);
50 
51     status_t initCheck() const;
52 
53     virtual status_t start(MetaData *params = NULL);
stopAudioSource54     virtual status_t stop() { return reset(); }
55     virtual sp<MetaData> getFormat();
56 
57     // Returns the maximum amplitude since last call.
58     int16_t getMaxAmplitude();
59 
60     virtual status_t read(
61             MediaBufferBase **buffer, const ReadOptions *options = NULL);
62     virtual status_t setStopTimeUs(int64_t stopTimeUs);
63 
64     status_t dataCallback(const AudioRecord::Buffer& buffer);
65     virtual void signalBufferReturned(MediaBufferBase *buffer);
66 
67     status_t setInputDevice(audio_port_handle_t deviceId);
68     status_t getRoutedDeviceId(audio_port_handle_t* deviceId);
69     status_t addAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
70     status_t removeAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
71 
72     status_t getActiveMicrophones(std::vector<media::MicrophoneInfo>* activeMicrophones);
73     status_t setPreferredMicrophoneDirection(audio_microphone_direction_t direction);
74     status_t setPreferredMicrophoneFieldDimension(float zoom);
75 
76     status_t getPortId(audio_port_handle_t *portId) const;
77 
78 protected:
79     virtual ~AudioSource();
80 
81 private:
82     enum {
83         kMaxBufferSize = 2048,
84 
85         // After the initial mute, we raise the volume linearly
86         // over kAutoRampDurationUs.
87         kAutoRampDurationUs = 300000,
88 
89         // This is the initial mute duration to suppress
90         // the video recording signal tone
91         kAutoRampStartUs = 0,
92     };
93 
94     Mutex mLock;
95     Condition mFrameAvailableCondition;
96     Condition mFrameEncodingCompletionCondition;
97 
98     sp<AudioRecord> mRecord;
99     status_t mInitCheck;
100     bool mStarted;
101     int32_t mSampleRate;
102     int32_t mOutSampleRate;
103 
104     bool mTrackMaxAmplitude;
105     int64_t mStartTimeUs;
106     int64_t mStopSystemTimeUs;
107     int64_t mLastFrameTimestampUs;
108     int16_t mMaxAmplitude;
109     int64_t mPrevSampleTimeUs;
110     int64_t mInitialReadTimeUs;
111     int64_t mNumFramesReceived;
112     int64_t mNumFramesSkipped;
113     int64_t mNumFramesLost;
114     int64_t mNumClientOwnedBuffers;
115     bool mNoMoreFramesToRead;
116 
117     List<MediaBuffer * > mBuffersReceived;
118 
119     void trackMaxAmplitude(int16_t *data, int nSamples);
120 
121     // This is used to raise the volume from mute to the
122     // actual level linearly.
123     void rampVolume(
124         int32_t startFrame, int32_t rampDurationFrames,
125         uint8_t *data,   size_t bytes);
126 
127     void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
128     void releaseQueuedFrames_l();
129     void waitOutstandingEncodingFrames_l();
130     status_t reset();
131 
132     AudioSource(const AudioSource &);
133     AudioSource &operator=(const AudioSource &);
134 };
135 
136 }  // namespace android
137 
138 #endif  // AUDIO_SOURCE_H_
139