A2DP Source API

a2dp_source.h : Audio/Video Distribution Transport Protocol A2DP Source is a device that streames media data.

/**
 * @brief Create A2DP Source service record. 
 * @param service
 * @param service_record_handle
 * @param supported_features 16-bit bitmap, see AVDTP_SOURCE_SF_* values in avdtp.h
 * @param service_name
 * @param service_provider_name
 */
void a2dp_source_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint16_t supported_features, const char * service_name, const char * service_provider_name);

/**
 * @brief Initialize up A2DP Source device.
 */
void a2dp_source_init(void);

/**
 * @brief Create a stream endpoint of type SOURCE, and register media codec by specifying its capabilities and the default configuration.
 * @param media_type                See avdtp_media_type_t values in avdtp.h (audio, video or multimedia).
 * @param media_codec_type          See avdtp_media_codec_type_t values in avdtp.h 
 * @param codec_capabilities        Media codec capabilities as defined in A2DP spec, section 4 - Audio Codec Interoperability Requirements.
 * @param codec_capabilities_len    Media codec capabilities length.
 * @param codec_configuration       Default media codec configuration.
 * @param codec_configuration_len   Media codec configuration length. 
 *
 * @return local_stream_endpoint                
 */
avdtp_stream_endpoint_t * a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type,
                                                             const uint8_t *codec_capabilities, uint16_t codec_capabilities_len,
                                                             uint8_t * codec_configuration, uint16_t codec_configuration_len);

/**
 *  @brief Unregister stream endpoint and free it's memory
 *  @param stream_endpoint created by a2dp_source_create_stream_endpoint
 */
void a2dp_source_finalize_stream_endpoint(avdtp_stream_endpoint_t * stream_endpoint);

/**
 * @brief Register callback for the A2DP Source client. It will receive following subevents of HCI_EVENT_A2DP_META HCI event type: 
 * - A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW:         Indicates that the next media packet can be sent.
 *
 * - A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED             Received when signaling connection with a remote is established.
 * - A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED                Received when signaling connection with a remote is released
 * - A2DP_SUBEVENT_STREAM_ESTABLISHED                           Received when stream to a remote device is established.
 * - A2DP_SUBEVENT_STREAM_STARTED                               Received when stream is started.
 * - A2DP_SUBEVENT_STREAM_SUSPENDED                             Received when stream is paused.
 * - A2DP_SUBEVENT_STREAM_STOPED                                received when stream is aborted or stopped.
 * - A2DP_SUBEVENT_STREAM_RELEASED                              Received when stream is released.
 * - A2DP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY         Currently the only capability that is passed to client
 * - A2DP_SUBEVENT_SIGNALING_CAPABILITIES_DONE                  Signals that all capabilities are reported
 * - A2DP_SUBEVENT_SIGNALING_DELAY_REPORT                       Delay report
 * - A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION      SBC configuration
 * - A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW          Signals that a media packet can be sent
 * - A2DP_SUBEVENT_COMMAND_REJECTED                             Command reject
 * @param callback
 */
void a2dp_source_register_packet_handler(btstack_packet_handler_t callback);

/**
 * @brief Open stream.
 * @param remote_addr
 * @param avdtp_cid         Assigned A2DP channel identifier used for further A2DP commands.
 */
uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint16_t *avdtp_cid);

    /**
     * @brief Reconfigure stream.
     * @param local_seid          ID assigned to a local stream endpoint
     * @param sampling_frequency  New sampling frequency to use. Cannot be called while stream is active
     */
uint8_t a2dp_source_reconfigure_stream_sampling_frequency(uint16_t a2dp_cid, uint32_t sampling_frequency);

/**
 * @brief Start stream.
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 */
uint8_t a2dp_source_start_stream(uint16_t a2dp_cid, uint8_t local_seid);

/**
 * @brief Pause stream.
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 */
uint8_t a2dp_source_pause_stream(uint16_t a2dp_cid, uint8_t local_seid);

/**
 * @brief Release stream and disconnect from remote. 
 * @param a2dp_cid          A2DP channel identifier.
 */
uint8_t a2dp_source_disconnect(uint16_t a2dp_cid);

/**
 * @brief Request to send a media packet. Packet can be then sent on reception of A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW event.
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 */
void    a2dp_source_stream_endpoint_request_can_send_now(uint16_t a2dp_cid, uint8_t local_seid);

/**
 * @brief Return maximal media payload size, does not include media header.
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @return max_media_payload_size_without_media_header
 */
int     a2dp_max_media_payload_size(uint16_t a2dp_cid, uint8_t local_seid);

/**
 * @brief Send media payload.
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param storage
 * @param num_bytes_to_copy
 * @param num_frames
 * @param marker
 * @return max_media_payload_size_without_media_header
 */
int     a2dp_source_stream_send_media_payload(uint16_t a2dp_cid, uint8_t local_seid, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames, uint8_t marker);

/**
 * @brief Send media payload.
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param marker
 * @param payload
 * @param payload_size
 * @param marker
 * @return status
 */
uint8_t a2dp_source_stream_send_media_payload_rtp(uint16_t a2dp_cid, uint8_t local_seid, uint8_t marker, uint8_t * payload, uint16_t payload_size);

/**
 * @brief Send media packet
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param packet
 * @param size
 * @return status
 */
uint8_t a2dp_source_stream_send_media_packet(uint16_t a2dp_cid, uint8_t local_seid, const uint8_t * packet, uint16_t size);

/**
 * @brief Select and configure SBC endpoint
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param remote_seid       ID of a remote stream endpoint.
 * @param configuration     SBC Configuration
 * @return status
 */
uint8_t a2dp_source_set_config_sbc(uint16_t a2dp_cid, uint8_t local_seid, uint8_t remote_seid, const avdtp_configuration_sbc_t * configuration);

/**
 * @brief Select and configure MPEG AUDIO endpoint
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param remote_seid       ID of a remote stream endpoint.
 * @param configuration     MPEG AUDIO Configuration
 * @return status
 */
uint8_t a2dp_source_set_config_mpeg_audio(uint16_t a2dp_cid, uint8_t local_seid, uint8_t remote_seid, const avdtp_configuration_mpeg_audio_t * configuration);

/**
 * @brief Select and configure MPEG AAC endpoint
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param remote_seid       ID of a remote stream endpoint.
 * @param configuration     MPEG AAC Configuration
 * @return status
 */
uint8_t a2dp_source_set_config_mpeg_aac(uint16_t a2dp_cid,  uint8_t local_seid,  uint8_t remote_seid, const avdtp_configuration_mpeg_aac_t * configuration);

/**
 * @brief Select and configure ATRAC endpoint
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param remote_seid       ID of a remote stream endpoint.
 * @param configuration     ATRAC Configuration
 * @return status
 */
uint8_t a2dp_source_set_config_atrac(uint16_t a2dp_cid,  uint8_t local_seid, uint8_t remote_seid, const avdtp_configuration_atrac_t * configuration);

/**
 * @brief Select and configure Non-A2DP endpoint. Bytes 0-3 of codec information contain Vendor ID, bytes 4-5 contain Vendor Specific Codec ID (little endian)
 * @param a2dp_cid          A2DP channel identifier.
 * @param local_seid        ID of a local stream endpoint.
 * @param remote_seid       ID of a remote stream endpoint.
 * @param media_codec_information
 * @param media_codec_information_len
 * @return status
 */
uint8_t a2dp_source_set_config_other(uint16_t a2dp_cid,  uint8_t local_seid, uint8_t remote_seid, const uint8_t * media_codec_information, uint8_t media_codec_information_len);

/**
 * @brief De-Init A2DP Source device.
 */
void a2dp_source_deinit(void);