xref: /btstack/src/classic/a2dp_sink.h (revision a95794cee1b77dd0c805e8606c008222803b81c5)

/*
 * Copyright (C) 2016 BlueKitchen GmbH
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 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
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 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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/**
 * @title A2DP Sink
 *
 * Audio/Video Distribution Transport Protocol A2DP Sink is a device that accepts streamed media data.
 *
 */

#ifndef A2DP_SINK_H
#define A2DP_SINK_H

#include <stdint.h>
#include "classic/avdtp.h"

#if defined __cplusplus
extern "C" {
#endif

/* API_START */

/**
 * @brief Create A2DP Sink service record.
 * @param service
 * @param service_record_handle
 * @param supported_features 16-bit bitmap, see AVDTP_SINK_SF_* values in avdtp.h
 * @param service_name
 * @param service_provider_name
 */
void a2dp_sink_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 Sink device.
 */
void a2dp_sink_init(void);

/**
 * @brief Create a stream endpoint of type SINK, 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_sink_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_sink_create_stream_endpoint
 */
void a2dp_sink_finalize_stream_endpoint(avdtp_stream_endpoint_t * stream_endpoint);

/**
 * @brief Register callback for the A2DP Sink client. It will receive following subevents of HCI_EVENT_A2DP_META HCI event type:
 * - A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:		indicates from remote chosen SBC media codec configuration
 * - A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION:	indicates from remote chosen other then SBC media codec configuration
 * - 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_CONNECTION_RELEASED: 				received when signaling channel is disconnected
 *
 * @param callback
 */
void a2dp_sink_register_packet_handler(btstack_packet_handler_t callback);

/**
 * @brief Register media handler for the A2DP Sink client.
 * @param callback
 * @param packet
 * @param size
 */
void a2dp_sink_register_media_handler(void (*callback)(uint8_t local_seid, uint8_t *packet, uint16_t size));

/**
 * @brief Establish stream.
 * @param remote
 * @param local_seid  		ID of a local stream endpoint.
 * @param out_a2dp_cid 		Assigned A2DP channel identifyer used for furhter A2DP commands.
 */
uint8_t a2dp_sink_establish_stream(bd_addr_t remote, uint8_t local_seid, uint16_t * out_a2dp_cid);

/**
 * @brief Release stream and disconnect from remote.
 * @param a2dp_cid 			A2DP channel identifyer.
 */
void a2dp_sink_disconnect(uint16_t a2dp_cid);

/**
 * @brief Register media configuration validator. Can reject insuitable configuration or report stream endpoint as currently busy
 * @note validator has to return AVDTP error codes like: AVDTP_ERROR_CODE_SEP_IN_USE or AVDTP_ERROR_CODE_UNSUPPORTED_CONFIGURATION
 *       the callback receives the media configuration in the same format as the existing A2dP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION
 *       and similar
 * @param callback
 */
void a2dp_sink_register_media_config_validator(uint8_t (*callback)(const avdtp_stream_endpoint_t * stream_endpoint, const uint8_t * event, uint16_t size));

/**
 * @brief De-Init A2DP Sink device.
 */
void a2dp_sink_deinit(void);

/* API_END */


#if defined __cplusplus
}
#endif

#endif // A2DP_SINK_H