AudioSystem.h revision 25658fd43d150a45fb37734a9f9f27f48bb5c133 
1/*
2 * Copyright (C) 2008 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_AUDIOSYSTEM_H_
18#define ANDROID_AUDIOSYSTEM_H_
19
20#include <utils/RefBase.h>
21#include <utils/threads.h>
22#include <media/IAudioFlinger.h>
23
24namespace android {
25
26typedef void (*audio_error_callback)(status_t err);
27
28class AudioSystem
29{
30public:
31
32    enum stream_type {
33        DEFAULT         =-1,
34        VOICE_CALL      = 0,
35        SYSTEM          = 1,
36        RING            = 2,
37        MUSIC           = 3,
38        ALARM           = 4,
39        NOTIFICATION    = 5,
40        BLUETOOTH_SCO   = 6,
41        NUM_STREAM_TYPES
42    };
43
44    enum audio_output_type {
45        AUDIO_OUTPUT_DEFAULT      =-1,
46        AUDIO_OUTPUT_HARDWARE     = 0,
47        AUDIO_OUTPUT_A2DP         = 1,
48        NUM_AUDIO_OUTPUT_TYPES
49    };
50
51    enum audio_format {
52        FORMAT_DEFAULT = 0,
53        PCM_16_BIT,
54        PCM_8_BIT,
55        INVALID_FORMAT
56    };
57
58    enum audio_mode {
59        MODE_INVALID = -2,
60        MODE_CURRENT = -1,
61        MODE_NORMAL = 0,
62        MODE_RINGTONE,
63        MODE_IN_CALL,
64        NUM_MODES  // not a valid entry, denotes end-of-list
65    };
66
67    enum audio_routes {
68        ROUTE_EARPIECE       = (1 << 0),
69        ROUTE_SPEAKER        = (1 << 1),
70        ROUTE_BLUETOOTH_SCO  = (1 << 2),
71        ROUTE_HEADSET        = (1 << 3),
72        ROUTE_BLUETOOTH_A2DP = (1 << 4),
73        ROUTE_ALL            = -1UL,
74    };
75
76    enum audio_in_acoustics {
77        AGC_ENABLE    = 0x0001,
78        AGC_DISABLE   = 0,
79        NS_ENABLE     = 0x0002,
80        NS_DISABLE    = 0,
81        TX_IIR_ENABLE = 0x0004,
82        TX_DISABLE    = 0
83    };
84
85    /* These are static methods to control the system-wide AudioFlinger
86     * only privileged processes can have access to them
87     */
88
89    // routing helper functions
90    static status_t speakerphone(bool state);
91    static status_t isSpeakerphoneOn(bool* state);
92    static status_t bluetoothSco(bool state);
93    static status_t isBluetoothScoOn(bool* state);
94    static status_t muteMicrophone(bool state);
95    static status_t isMicrophoneMuted(bool *state);
96
97    static status_t setMasterVolume(float value);
98    static status_t setMasterMute(bool mute);
99    static status_t getMasterVolume(float* volume);
100    static status_t getMasterMute(bool* mute);
101
102    static status_t setStreamVolume(int stream, float value);
103    static status_t setStreamMute(int stream, bool mute);
104    static status_t getStreamVolume(int stream, float* volume);
105    static status_t getStreamMute(int stream, bool* mute);
106
107    static status_t setMode(int mode);
108    static status_t getMode(int* mode);
109
110    static status_t setRouting(int mode, uint32_t routes, uint32_t mask);
111    static status_t getRouting(int mode, uint32_t* routes);
112
113    static status_t isMusicActive(bool *state);
114
115    // Temporary interface, do not use
116    // TODO: Replace with a more generic key:value get/set mechanism
117    static status_t setParameter(const char* key, const char* value);
118
119    static void setErrorCallback(audio_error_callback cb);
120
121    // helper function to obtain AudioFlinger service handle
122    static const sp<IAudioFlinger>& get_audio_flinger();
123
124    static float linearToLog(int volume);
125    static int logToLinear(float volume);
126
127    static status_t getOutputSamplingRate(int* samplingRate, int stream = DEFAULT);
128    static status_t getOutputFrameCount(int* frameCount, int stream = DEFAULT);
129    static status_t getOutputLatency(uint32_t* latency, int stream = DEFAULT);
130
131    static bool routedToA2dpOutput(int streamType);
132
133    static status_t getInputBufferSize(uint32_t sampleRate, int format, int channelCount,
134        size_t* buffSize);
135
136    // ----------------------------------------------------------------------------
137
138private:
139
140    class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient
141    {
142    public:
143        AudioFlingerClient() {
144        }
145
146        // DeathRecipient
147        virtual void binderDied(const wp<IBinder>& who);
148
149        // IAudioFlingerClient
150        virtual void a2dpEnabledChanged(bool enabled);
151
152    };
153    static int getOutput(int streamType);
154
155    static sp<AudioFlingerClient> gAudioFlingerClient;
156
157    friend class AudioFlingerClient;
158
159    static Mutex gLock;
160    static sp<IAudioFlinger> gAudioFlinger;
161    static audio_error_callback gAudioErrorCallback;
162    static int gOutSamplingRate[NUM_AUDIO_OUTPUT_TYPES];
163    static int gOutFrameCount[NUM_AUDIO_OUTPUT_TYPES];
164    static uint32_t gOutLatency[NUM_AUDIO_OUTPUT_TYPES];
165    static bool gA2dpEnabled;
166
167    static size_t gInBuffSize;
168    // previous parameters for recording buffer size queries
169    static uint32_t gPrevInSamplingRate;
170    static int gPrevInFormat;
171    static int gPrevInChannelCount;
172
173};
174
175};  // namespace android
176
177#endif  /*ANDROID_AUDIOSYSTEM_H_*/
178