1 /* 2 * Copyright (C) 2012 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_INCLUDE_BT_AV_H 18 #define ANDROID_INCLUDE_BT_AV_H 19 20 __BEGIN_DECLS 21 22 /* Bluetooth AV connection states */ 23 typedef enum { 24 BTAV_CONNECTION_STATE_DISCONNECTED = 0, 25 BTAV_CONNECTION_STATE_CONNECTING, 26 BTAV_CONNECTION_STATE_CONNECTED, 27 BTAV_CONNECTION_STATE_DISCONNECTING 28 } btav_connection_state_t; 29 30 /* Bluetooth AV datapath states */ 31 typedef enum { 32 BTAV_AUDIO_STATE_REMOTE_SUSPEND = 0, 33 BTAV_AUDIO_STATE_STOPPED, 34 BTAV_AUDIO_STATE_STARTED, 35 } btav_audio_state_t; 36 37 38 /** Callback for connection state change. 39 * state will have one of the values from btav_connection_state_t 40 */ 41 typedef void (* btav_connection_state_callback)(btav_connection_state_t state, 42 bt_bdaddr_t *bd_addr); 43 44 /** Callback for audiopath state change. 45 * state will have one of the values from btav_audio_state_t 46 */ 47 typedef void (* btav_audio_state_callback)(btav_audio_state_t state, 48 bt_bdaddr_t *bd_addr); 49 50 /** Callback for audio configuration change. 51 * Used only for the A2DP sink interface. 52 * state will have one of the values from btav_audio_state_t 53 * sample_rate: sample rate in Hz 54 * channel_count: number of channels (1 for mono, 2 for stereo) 55 */ 56 typedef void (* btav_audio_config_callback)(bt_bdaddr_t *bd_addr, 57 uint32_t sample_rate, 58 uint8_t channel_count); 59 60 /** BT-AV callback structure. */ 61 typedef struct { 62 /** set to sizeof(btav_callbacks_t) */ 63 size_t size; 64 btav_connection_state_callback connection_state_cb; 65 btav_audio_state_callback audio_state_cb; 66 btav_audio_config_callback audio_config_cb; 67 } btav_callbacks_t; 68 69 /** 70 * NOTE: 71 * 72 * 1. AVRCP 1.0 shall be supported initially. AVRCP passthrough commands 73 * shall be handled internally via uinput 74 * 75 * 2. A2DP data path shall be handled via a socket pipe between the AudioFlinger 76 * android_audio_hw library and the Bluetooth stack. 77 * 78 */ 79 /** Represents the standard BT-AV interface. 80 * Used for both the A2DP source and sink interfaces. 81 */ 82 typedef struct { 83 84 /** set to sizeof(btav_interface_t) */ 85 size_t size; 86 /** 87 * Register the BtAv callbacks 88 */ 89 bt_status_t (*init)( btav_callbacks_t* callbacks ); 90 91 /** connect to headset */ 92 bt_status_t (*connect)( bt_bdaddr_t *bd_addr ); 93 94 /** dis-connect from headset */ 95 bt_status_t (*disconnect)( bt_bdaddr_t *bd_addr ); 96 97 /** Closes the interface. */ 98 void (*cleanup)( void ); 99 100 /** Sends Audio Focus State. */ 101 void (*set_audio_focus_state)( int focus_state ); 102 103 /** Sets the audio track gain. */ 104 void (*set_audio_track_gain)( float gain ); 105 } btav_interface_t; 106 107 __END_DECLS 108 109 #endif /* ANDROID_INCLUDE_BT_AV_H */ 110
