117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_INCLUDE_BT_AV_H
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#define ANDROID_INCLUDE_BT_AV_H
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__BEGIN_DECLS
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/* Bluetooth AV connection states */
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typedef enum {
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BTAV_CONNECTION_STATE_DISCONNECTED = 0,
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BTAV_CONNECTION_STATE_CONNECTING,
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BTAV_CONNECTION_STATE_CONNECTED,
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BTAV_CONNECTION_STATE_DISCONNECTING
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} btav_connection_state_t;
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/* Bluetooth AV datapath states */
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typedef enum {
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BTAV_AUDIO_STATE_REMOTE_SUSPEND = 0,
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BTAV_AUDIO_STATE_STOPPED,
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BTAV_AUDIO_STATE_STARTED,
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} btav_audio_state_t;
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/** Callback for connection state change.
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* state will have one of the values from btav_connection_state_t
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*/
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typedef void (* btav_connection_state_callback)(btav_connection_state_t state,
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bt_bdaddr_t *bd_addr);
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/** Callback for audiopath state change.
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* state will have one of the values from btav_audio_state_t
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*/
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typedef void (* btav_audio_state_callback)(btav_audio_state_t state,
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bt_bdaddr_t *bd_addr);
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/** Callback for audio configuration change.
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* Used only for the A2DP sink interface.
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* state will have one of the values from btav_audio_state_t
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* sample_rate: sample rate in Hz
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* channel_count: number of channels (1 for mono, 2 for stereo)
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*/
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typedef void (* btav_audio_config_callback)(bt_bdaddr_t *bd_addr,
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uint32_t sample_rate,
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uint8_t channel_count);
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/*
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* Callback for audio focus request to be used only in
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* case of A2DP Sink. This is required because we are using
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* AudioTrack approach for audio data rendering.
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*/
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typedef void (* btav_audio_focus_request_callback)(bt_bdaddr_t *bd_addr);
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/** BT-AV callback structure. */
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typedef struct {
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/** set to sizeof(btav_callbacks_t) */
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size_t size;
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btav_connection_state_callback connection_state_cb;
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btav_audio_state_callback audio_state_cb;
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btav_audio_config_callback audio_config_cb;
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btav_audio_focus_request_callback audio_focus_request_cb;
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} btav_callbacks_t;
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/**
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* NOTE:
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*
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* 1. AVRCP 1.0 shall be supported initially. AVRCP passthrough commands
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* shall be handled internally via uinput
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*
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* 2. A2DP data path shall be handled via a socket pipe between the AudioFlinger
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* android_audio_hw library and the Bluetooth stack.
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*
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*/
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/** Represents the standard BT-AV interface.
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* Used for both the A2DP source and sink interfaces.
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*/
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typedef struct {
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/** set to sizeof(btav_interface_t) */
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size_t size;
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/**
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* Register the BtAv callbacks
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*/
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bt_status_t (*init)( btav_callbacks_t* callbacks );
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/** connect to headset */
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bt_status_t (*connect)( bt_bdaddr_t *bd_addr );
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/** dis-connect from headset */
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bt_status_t (*disconnect)( bt_bdaddr_t *bd_addr );
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/** Closes the interface. */
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void (*cleanup)( void );
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/** Sends Audio Focus State. */
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void (*set_audio_focus_state)( int focus_state );
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/** Sets the audio track gain. */
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void (*set_audio_track_gain)( float gain );
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} btav_interface_t;
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__END_DECLS
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#endif /* ANDROID_INCLUDE_BT_AV_H */
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