android 耳机系统笔记2 --多媒体设备各种状态

frameworks\base\include\media\AudioSystem.h中定义

===================================================================

device:

enum audio_devices {

        // output devices

        DEVICE_OUT_EARPIECE = 0x1,

        DEVICE_OUT_SPEAKER = 0x2,

        DEVICE_OUT_WIRED_HEADSET = 0x4,

        DEVICE_OUT_WIRED_HEADPHONE = 0x8,

        DEVICE_OUT_BLUETOOTH_SCO = 0x10,

        DEVICE_OUT_BLUETOOTH_SCO_HEADSET = 0x20,

        DEVICE_OUT_BLUETOOTH_SCO_CARKIT = 0x40,

        DEVICE_OUT_BLUETOOTH_A2DP = 0x80,

        DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES = 0x100,

        DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER = 0x200,

        DEVICE_OUT_AUX_DIGITAL = 0x400,

        DEVICE_OUT_DEFAULT = 0x8000,

        DEVICE_OUT_ALL = (DEVICE_OUT_EARPIECE | DEVICE_OUT_SPEAKER | DEVICE_OUT_WIRED_HEADSET |

                DEVICE_OUT_WIRED_HEADPHONE | DEVICE_OUT_BLUETOOTH_SCO | DEVICE_OUT_BLUETOOTH_SCO_HEADSET |

                DEVICE_OUT_BLUETOOTH_SCO_CARKIT | DEVICE_OUT_BLUETOOTH_A2DP | DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |

                DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER | DEVICE_OUT_AUX_DIGITAL | DEVICE_OUT_DEFAULT),

        DEVICE_OUT_ALL_A2DP = (DEVICE_OUT_BLUETOOTH_A2DP | DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |

                DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER),

        // input devices

        DEVICE_IN_COMMUNICATION = 0x10000,

        DEVICE_IN_AMBIENT = 0x20000,

        DEVICE_IN_BUILTIN_MIC = 0x40000,

        DEVICE_IN_BLUETOOTH_SCO_HEADSET = 0x80000,

        DEVICE_IN_WIRED_HEADSET = 0x100000,

        DEVICE_IN_AUX_DIGITAL = 0x200000,

        DEVICE_IN_VOICE_CALL = 0x400000,

        DEVICE_IN_BACK_MIC = 0x800000,

        DEVICE_IN_DEFAULT = 0x80000000,

        DEVICE_IN_ALL = (DEVICE_IN_COMMUNICATION | DEVICE_IN_AMBIENT | DEVICE_IN_BUILTIN_MIC |

                DEVICE_IN_BLUETOOTH_SCO_HEADSET | DEVICE_IN_WIRED_HEADSET | DEVICE_IN_AUX_DIGITAL |

                DEVICE_IN_VOICE_CALL | DEVICE_IN_BACK_MIC | DEVICE_IN_DEFAULT)

    };

====================================================================

mode:

enum audio_mode {

        MODE_INVALID = -2,

        MODE_CURRENT = -1,

        MODE_NORMAL = 0,

        MODE_RINGTONE,

        MODE_IN_CALL,

        NUM_MODES  // not a valid entry, denotes end-of-list

    };

=====================================================================

channel:

enum audio_channels {

        // output channels

        CHANNEL_OUT_FRONT_LEFT = 0x4,

        CHANNEL_OUT_FRONT_RIGHT = 0x8,

        CHANNEL_OUT_FRONT_CENTER = 0x10,

        CHANNEL_OUT_LOW_FREQUENCY = 0x20,

        CHANNEL_OUT_BACK_LEFT = 0x40,

        CHANNEL_OUT_BACK_RIGHT = 0x80,

        CHANNEL_OUT_FRONT_LEFT_OF_CENTER = 0x100,

        CHANNEL_OUT_FRONT_RIGHT_OF_CENTER = 0x200,

        CHANNEL_OUT_BACK_CENTER = 0x400,

        CHANNEL_OUT_MONO = CHANNEL_OUT_FRONT_LEFT,

        CHANNEL_OUT_STEREO = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT),

        CHANNEL_OUT_QUAD = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |

                CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT),

        CHANNEL_OUT_SURROUND = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |

                CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_BACK_CENTER),

        CHANNEL_OUT_5POINT1 = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |

                CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_LOW_FREQUENCY | CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT),

        CHANNEL_OUT_7POINT1 = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |

                CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_LOW_FREQUENCY | CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT |

                CHANNEL_OUT_FRONT_LEFT_OF_CENTER | CHANNEL_OUT_FRONT_RIGHT_OF_CENTER),

        CHANNEL_OUT_ALL = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT |

                CHANNEL_OUT_FRONT_CENTER | CHANNEL_OUT_LOW_FREQUENCY | CHANNEL_OUT_BACK_LEFT | CHANNEL_OUT_BACK_RIGHT |

                CHANNEL_OUT_FRONT_LEFT_OF_CENTER | CHANNEL_OUT_FRONT_RIGHT_OF_CENTER | CHANNEL_OUT_BACK_CENTER),

        // input channels

        CHANNEL_IN_LEFT = 0x4,

        CHANNEL_IN_RIGHT = 0x8,

        CHANNEL_IN_FRONT = 0x10,

        CHANNEL_IN_BACK = 0x20,

        CHANNEL_IN_LEFT_PROCESSED = 0x40,

        CHANNEL_IN_RIGHT_PROCESSED = 0x80,

        CHANNEL_IN_FRONT_PROCESSED = 0x100,

        CHANNEL_IN_BACK_PROCESSED = 0x200,

        CHANNEL_IN_PRESSURE = 0x400,

        CHANNEL_IN_X_AXIS = 0x800,

        CHANNEL_IN_Y_AXIS = 0x1000,

        CHANNEL_IN_Z_AXIS = 0x2000,

        CHANNEL_IN_VOICE_UPLINK = 0x4000,

        CHANNEL_IN_VOICE_DNLINK = 0x8000,

        CHANNEL_IN_MONO = CHANNEL_IN_FRONT,

        CHANNEL_IN_STEREO = (CHANNEL_IN_LEFT | CHANNEL_IN_RIGHT),

        CHANNEL_IN_ALL = (CHANNEL_IN_LEFT | CHANNEL_IN_RIGHT | CHANNEL_IN_FRONT | CHANNEL_IN_BACK|

                CHANNEL_IN_LEFT_PROCESSED | CHANNEL_IN_RIGHT_PROCESSED | CHANNEL_IN_FRONT_PROCESSED | CHANNEL_IN_BACK_PROCESSED|

                CHANNEL_IN_PRESSURE | CHANNEL_IN_X_AXIS | CHANNEL_IN_Y_AXIS | CHANNEL_IN_Z_AXIS |

                CHANNEL_IN_VOICE_UPLINK | CHANNEL_IN_VOICE_DNLINK)

    };

=====================================================================

connection_state:

enum device_connection_state {

        DEVICE_STATE_UNAVAILABLE,

        DEVICE_STATE_AVAILABLE,

        NUM_DEVICE_STATES

    };