分为 c++ 层 跟 java 层
java 层
在 frameworks/base/media/java/android/media/AudioSystem.java 里面
public static final int DEVICE_NONE = 0x0;
// reserved bits
public static final int DEVICE_BIT_IN = 0x80000000;
public static final int DEVICE_BIT_DEFAULT = 0x40000000;
// output devices, be sure to update AudioManager.java also
public static final int DEVICE_OUT_EARPIECE = 0x1;
public static final int DEVICE_OUT_SPEAKER = 0x2;
public static final int DEVICE_OUT_WIRED_HEADSET = 0x4;
public static final int DEVICE_OUT_WIRED_HEADPHONE = 0x8;
public static final int DEVICE_OUT_BLUETOOTH_SCO = 0x10;
public static final int DEVICE_OUT_BLUETOOTH_SCO_HEADSET = 0x20;
public static final int DEVICE_OUT_BLUETOOTH_SCO_CARKIT = 0x40;
public static final int DEVICE_OUT_BLUETOOTH_A2DP = 0x80;
public static final int DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES = 0x100;
public static final int DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER = 0x200;
public static final int DEVICE_OUT_AUX_DIGITAL = 0x400;
public static final int DEVICE_OUT_HDMI = DEVICE_OUT_AUX_DIGITAL;
public static final int DEVICE_OUT_ANLG_DOCK_HEADSET = 0x800;
public static final int DEVICE_OUT_DGTL_DOCK_HEADSET = 0x1000;
public static final int DEVICE_OUT_USB_ACCESSORY = 0x2000;
public static final int DEVICE_OUT_USB_DEVICE = 0x4000;
public static final int DEVICE_OUT_REMOTE_SUBMIX = 0x8000;
public static final int DEVICE_OUT_TELEPHONY_TX = 0x10000;
public static final int DEVICE_OUT_LINE = 0x20000;
public static final int DEVICE_OUT_HDMI_ARC = 0x40000;
public static final int DEVICE_OUT_SPDIF = 0x80000;
public static final int DEVICE_OUT_FM = 0x100000;
public static final int DEVICE_OUT_AUX_LINE = 0x200000;
public static final int DEVICE_OUT_SPEAKER_SAFE = 0x400000;
public static final int DEVICE_OUT_IP = 0x800000;
public static final int DEVICE_OUT_BUS = 0x1000000;
public static final int DEVICE_OUT_PROXY = 0x2000000;
public static final int DEVICE_OUT_USB_HEADSET = 0x4000000;
public static final int DEVICE_IN_COMMUNICATION = DEVICE_BIT_IN | 0x1;
public static final int DEVICE_IN_AMBIENT = DEVICE_BIT_IN | 0x2;
public static final int DEVICE_IN_BUILTIN_MIC = DEVICE_BIT_IN | 0x4;
public static final int DEVICE_IN_BLUETOOTH_SCO_HEADSET = DEVICE_BIT_IN | 0x8;
public static final int DEVICE_IN_WIRED_HEADSET = DEVICE_BIT_IN | 0x10;
public static final int DEVICE_IN_AUX_DIGITAL = DEVICE_BIT_IN | 0x20;
public static final int DEVICE_IN_HDMI = DEVICE_IN_AUX_DIGITAL;
public static final int DEVICE_IN_VOICE_CALL = DEVICE_BIT_IN | 0x40;
public static final int DEVICE_IN_TELEPHONY_RX = DEVICE_IN_VOICE_CALL;
public static final int DEVICE_IN_BACK_MIC = DEVICE_BIT_IN | 0x80;
public static final int DEVICE_IN_REMOTE_SUBMIX = DEVICE_BIT_IN | 0x100;
public static final int DEVICE_IN_ANLG_DOCK_HEADSET = DEVICE_BIT_IN | 0x200;
public static final int DEVICE_IN_DGTL_DOCK_HEADSET = DEVICE_BIT_IN | 0x400;
public static final int DEVICE_IN_USB_ACCESSORY = DEVICE_BIT_IN | 0x800;
public static final int DEVICE_IN_USB_DEVICE = DEVICE_BIT_IN | 0x1000;
public static final int DEVICE_IN_FM_TUNER = DEVICE_BIT_IN | 0x2000;
public static final int DEVICE_IN_TV_TUNER = DEVICE_BIT_IN | 0x4000;
public static final int DEVICE_IN_LINE = DEVICE_BIT_IN | 0x8000;
public static final int DEVICE_IN_SPDIF = DEVICE_BIT_IN | 0x10000;
public static final int DEVICE_IN_BLUETOOTH_A2DP = DEVICE_BIT_IN | 0x20000;
public static final int DEVICE_IN_LOOPBACK = DEVICE_BIT_IN | 0x40000;
public static final int DEVICE_IN_IP = DEVICE_BIT_IN | 0x80000;
public static final int DEVICE_IN_BUS = DEVICE_BIT_IN | 0x100000;
public static final int DEVICE_IN_PROXY = DEVICE_BIT_IN | 0x1000000;
public static final int DEVICE_IN_USB_HEADSET = DEVICE_BIT_IN | 0x2000000;
public static final int DEVICE_IN_DEFAULT = DEVICE_BIT_IN | DEVICE_BIT_DEFAULT;
c++ 层
system/media/audio/include/system/audio-base.h
enum {
AUDIO_DEVICE_NONE = 0u, // 0x0
AUDIO_DEVICE_BIT_IN = 2147483648u, // 0x80000000
AUDIO_DEVICE_BIT_DEFAULT = 1073741824u, // 0x40000000
AUDIO_DEVICE_OUT_EARPIECE = 1u, // 0x1
AUDIO_DEVICE_OUT_SPEAKER = 2u, // 0x2
AUDIO_DEVICE_OUT_WIRED_HEADSET = 4u, // 0x4
AUDIO_DEVICE_OUT_WIRED_HEADPHONE = 8u, // 0x8
AUDIO_DEVICE_OUT_BLUETOOTH_SCO = 16u, // 0x10
AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET = 32u, // 0x20
AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT = 64u, // 0x40
AUDIO_DEVICE_OUT_BLUETOOTH_A2DP = 128u, // 0x80
AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES = 256u, // 0x100
AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER = 512u, // 0x200
AUDIO_DEVICE_OUT_AUX_DIGITAL = 1024u, // 0x400
AUDIO_DEVICE_OUT_HDMI = 1024u, // OUT_AUX_DIGITAL
AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET = 2048u, // 0x800
AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET = 4096u, // 0x1000
AUDIO_DEVICE_OUT_USB_ACCESSORY = 8192u, // 0x2000
AUDIO_DEVICE_OUT_USB_DEVICE = 16384u, // 0x4000
AUDIO_DEVICE_OUT_REMOTE_SUBMIX = 32768u, // 0x8000
AUDIO_DEVICE_OUT_TELEPHONY_TX = 65536u, // 0x10000
AUDIO_DEVICE_OUT_LINE = 131072u, // 0x20000
AUDIO_DEVICE_OUT_HDMI_ARC = 262144u, // 0x40000
AUDIO_DEVICE_OUT_SPDIF = 524288u, // 0x80000
AUDIO_DEVICE_OUT_FM = 1048576u, // 0x100000
AUDIO_DEVICE_OUT_AUX_LINE = 2097152u, // 0x200000
AUDIO_DEVICE_OUT_SPEAKER_SAFE = 4194304u, // 0x400000
AUDIO_DEVICE_OUT_IP = 8388608u, // 0x800000
AUDIO_DEVICE_OUT_BUS = 16777216u, // 0x1000000
AUDIO_DEVICE_OUT_PROXY = 33554432u, // 0x2000000
AUDIO_DEVICE_OUT_USB_HEADSET = 67108864u, // 0x4000000
AUDIO_DEVICE_OUT_DEFAULT = 1073741824u, // BIT_DEFAULT
AUDIO_DEVICE_OUT_ALL = 1207959551u, // (((((((((((((((((((((((((((OUT_EARPIECE | OUT_SPEAKER) | OUT_WIRED_HEADSET) | OUT_WIRED_HEADPHONE) | OUT_BLUETOOTH_SCO) | OUT_BLUETOOTH_SCO_HEADSET) | OUT_BLUETOOTH_SCO_CARKIT) | OUT_BLUETOOTH_A2DP) | OUT_BLUETOOTH_A2DP_HEADPHONES) | OUT_BLUETOOTH_A2DP_SPEAKER) | OUT_HDMI) | OUT_ANLG_DOCK_HEADSET) | OUT_DGTL_DOCK_HEADSET) | OUT_USB_ACCESSORY) | OUT_USB_DEVICE) | OUT_REMOTE_SUBMIX) | OUT_TELEPHONY_TX) | OUT_LINE) | OUT_HDMI_ARC) | OUT_SPDIF) | OUT_FM) | OUT_AUX_LINE) | OUT_SPEAKER_SAFE) | OUT_IP) | OUT_BUS) | OUT_PROXY) | OUT_USB_HEADSET) | OUT_DEFAULT)
AUDIO_DEVICE_OUT_ALL_A2DP = 896u, // ((OUT_BLUETOOTH_A2DP | OUT_BLUETOOTH_A2DP_HEADPHONES) | OUT_BLUETOOTH_A2DP_SPEAKER)
AUDIO_DEVICE_OUT_ALL_SCO = 112u, // ((OUT_BLUETOOTH_SCO | OUT_BLUETOOTH_SCO_HEADSET) | OUT_BLUETOOTH_SCO_CARKIT)
AUDIO_DEVICE_OUT_ALL_USB = 67133440u, // ((OUT_USB_ACCESSORY | OUT_USB_DEVICE) | OUT_USB_HEADSET)
AUDIO_DEVICE_IN_COMMUNICATION = 2147483649u, // (BIT_IN | 0x1)
AUDIO_DEVICE_IN_AMBIENT = 2147483650u, // (BIT_IN | 0x2)
AUDIO_DEVICE_IN_BUILTIN_MIC = 2147483652u, // (BIT_IN | 0x4)
AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET = 2147483656u, // (BIT_IN | 0x8)
AUDIO_DEVICE_IN_WIRED_HEADSET = 2147483664u, // (BIT_IN | 0x10)
AUDIO_DEVICE_IN_AUX_DIGITAL = 2147483680u, // (BIT_IN | 0x20)
AUDIO_DEVICE_IN_HDMI = 2147483680u, // IN_AUX_DIGITAL
AUDIO_DEVICE_IN_VOICE_CALL = 2147483712u, // (BIT_IN | 0x40)
AUDIO_DEVICE_IN_TELEPHONY_RX = 2147483712u, // IN_VOICE_CALL
AUDIO_DEVICE_IN_BACK_MIC = 2147483776u, // (BIT_IN | 0x80)
AUDIO_DEVICE_IN_REMOTE_SUBMIX = 2147483904u, // (BIT_IN | 0x100)
AUDIO_DEVICE_IN_ANLG_DOCK_HEADSET = 2147484160u, // (BIT_IN | 0x200)
AUDIO_DEVICE_IN_DGTL_DOCK_HEADSET = 2147484672u, // (BIT_IN | 0x400)
AUDIO_DEVICE_IN_USB_ACCESSORY = 2147485696u, // (BIT_IN | 0x800)
AUDIO_DEVICE_IN_USB_DEVICE = 2147487744u, // (BIT_IN | 0x1000)
AUDIO_DEVICE_IN_FM_TUNER = 2147491840u, // (BIT_IN | 0x2000)
AUDIO_DEVICE_IN_TV_TUNER = 2147500032u, // (BIT_IN | 0x4000)
AUDIO_DEVICE_IN_LINE = 2147516416u, // (BIT_IN | 0x8000)
AUDIO_DEVICE_IN_SPDIF = 2147549184u, // (BIT_IN | 0x10000)
AUDIO_DEVICE_IN_BLUETOOTH_A2DP = 2147614720u, // (BIT_IN | 0x20000)
AUDIO_DEVICE_IN_LOOPBACK = 2147745792u, // (BIT_IN | 0x40000)
AUDIO_DEVICE_IN_IP = 2148007936u, // (BIT_IN | 0x80000)
AUDIO_DEVICE_IN_BUS = 2148532224u, // (BIT_IN | 0x100000)
AUDIO_DEVICE_IN_PROXY = 2164260864u, // (BIT_IN | 0x1000000)
AUDIO_DEVICE_IN_USB_HEADSET = 2181038080u, // (BIT_IN | 0x2000000)
AUDIO_DEVICE_IN_DEFAULT = 3221225472u, // (BIT_IN | BIT_DEFAULT)
AUDIO_DEVICE_IN_ALL = 3273654271u, // (((((((((((((((((((((((IN_COMMUNICATION | IN_AMBIENT) | IN_BUILTIN_MIC) | IN_BLUETOOTH_SCO_HEADSET) | IN_WIRED_HEADSET) | IN_HDMI) | IN_TELEPHONY_RX) | IN_BACK_MIC) | IN_REMOTE_SUBMIX) | IN_ANLG_DOCK_HEADSET) | IN_DGTL_DOCK_HEADSET) | IN_USB_ACCESSORY) | IN_USB_DEVICE) | IN_FM_TUNER) | IN_TV_TUNER) | IN_LINE) | IN_SPDIF) | IN_BLUETOOTH_A2DP) | IN_LOOPBACK) | IN_IP) | IN_BUS) | IN_PROXY) | IN_USB_HEADSET) | IN_DEFAULT)
AUDIO_DEVICE_IN_ALL_SCO = 2147483656u, // IN_BLUETOOTH_SCO_HEADSET
AUDIO_DEVICE_IN_ALL_USB = 2181044224u, // ((IN_USB_ACCESSORY | IN_USB_DEVICE) | IN_USB_HEADSET)
};
