xref: /btstack/src/classic/a2dp_sink.c (revision 93aeaf99fa2ec7afcbe1000b5d6d8a545b8d016d)

/*
 * Copyright (C) 2016 BlueKitchen GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    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
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Please inquire about commercial licensing options at
 * [email protected]
 *
 */

#define BTSTACK_FILE__ "a2dp_sink.c"

#include <stdint.h>
#include <string.h>

#include "bluetooth_psm.h"
#include "bluetooth_sdp.h"
#include "btstack_debug.h"
#include "btstack_event.h"
#include "classic/a2dp.h"
#include "classic/a2dp_sink.h"
#include "classic/avdtp_sink.h"
#include "classic/avdtp_util.h"
#include "classic/sdp_util.h"

static const char * a2dp_sink_default_service_name = "BTstack A2DP Sink Service";
static const char * a2dp_sink_default_service_provider_name = "BTstack A2DP Sink Service Provider";

static uint16_t a2dp_sink_cid;
static bool a2dp_sink_stream_endpoint_configured = false;

static uint8_t (*a2dp_sink_media_config_validator)(const avdtp_stream_endpoint_t * stream_endpoint, const uint8_t * event, uint16_t size);

static void a2dp_sink_packet_handler_internal(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);

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){
    if (service_provider_name == NULL){
        service_provider_name = a2dp_sink_default_service_provider_name;
    }
    if (service_name == NULL){
        service_name = a2dp_sink_default_service_name;
    }
    a2dp_create_sdp_record(service, service_record_handle, BLUETOOTH_SERVICE_CLASS_AUDIO_SINK,
                           supported_features, service_name, service_provider_name);
}

void a2dp_sink_register_packet_handler(btstack_packet_handler_t callback){
    btstack_assert(callback);

    avdtp_sink_register_packet_handler(&a2dp_sink_packet_handler_internal);
    a2dp_register_sink_packet_handler(callback);
}

void a2dp_sink_register_media_handler(void (*callback)(uint8_t local_seid, uint8_t *packet, uint16_t size)){
    if (callback == NULL){
        log_error("a2dp_sink_register_media_handler called with NULL callback");
        return;
    }
    avdtp_sink_register_media_handler(callback);
}

void a2dp_sink_init(void){
    a2dp_init();
    avdtp_sink_init();
}

void a2dp_sink_deinit(void){
    a2dp_deinit();
    avdtp_sink_deinit();

    a2dp_sink_cid = 0;
    a2dp_sink_media_config_validator = NULL;
    a2dp_sink_stream_endpoint_configured = false;
}

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){
    avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_sink_create_stream_endpoint(AVDTP_SINK, media_type);
    if (!local_stream_endpoint){
        return NULL;
    }
    avdtp_sink_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint));
    avdtp_sink_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type,
        codec_capabilities, codec_capabilities_len);
	avdtp_sink_register_delay_reporting_category(avdtp_stream_endpoint_seid(local_stream_endpoint));

	// store user codec configuration buffer
	local_stream_endpoint->media_codec_configuration_info = codec_configuration;
	local_stream_endpoint->media_codec_configuration_len  = codec_configuration_len;

    return local_stream_endpoint;
}

void a2dp_sink_finalize_stream_endpoint(avdtp_stream_endpoint_t * stream_endpoint){
    avdtp_sink_finalize_stream_endpoint(stream_endpoint);
}

uint8_t a2dp_sink_establish_stream(bd_addr_t bd_addr, uint8_t local_seid, uint16_t * avdtp_cid){
	avdtp_stream_endpoint_t * stream_endpoint = avdtp_get_stream_endpoint_for_seid(local_seid);
    if (stream_endpoint == NULL){
        log_info("No local_stream_endpoint for seid %d", local_seid);
        return ERROR_CODE_COMMAND_DISALLOWED;
    }
    uint16_t outgoing_cid;

    uint8_t status = avdtp_sink_connect(bd_addr, &outgoing_cid);
    if (status != ERROR_CODE_SUCCESS){
        return status;
    }

    avdtp_connection_t * connection = avdtp_get_connection_for_avdtp_cid(outgoing_cid);
    btstack_assert(connection != NULL);

    // setup state
    connection->a2dp_sink_config_process.outgoing_active = true;
    *avdtp_cid = outgoing_cid;

    return ERROR_CODE_SUCCESS;
}

#ifdef ENABLE_AVDTP_ACCEPTOR_EXPLICIT_START_STREAM_CONFIRMATION
uint8_t a2dp_sink_start_stream_accept(uint16_t a2dp_cid, uint8_t local_seid){
    return avdtp_start_stream_accept(a2dp_cid, local_seid);
}

uint8_t a2dp_sink_start_stream_reject(uint16_t a2dp_cid, uint8_t local_seid){
    return avdtp_start_stream_reject(a2dp_cid, local_seid);
}
#endif

void a2dp_sink_disconnect(uint16_t a2dp_cid){
    avdtp_disconnect(a2dp_cid);
}

static void a2dp_sink_packet_handler_internal(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    UNUSED(channel);
    UNUSED(size);

    uint16_t cid;
    avdtp_connection_t * connection;
    uint8_t status;
    uint8_t local_seid;
    uint8_t signal_identifier;
    bool reconfigure;
    uint8_t subevent_id;

    if (packet_type != HCI_EVENT_PACKET) return;
    if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return;

    switch (packet[2]){
        case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED:
            if (a2dp_sink_stream_endpoint_configured) return;

            cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet);
            connection = avdtp_get_connection_for_avdtp_cid(cid);
            btstack_assert(connection != NULL);

            status = avdtp_subevent_signaling_connection_established_get_status(packet);
            if (status != ERROR_CODE_SUCCESS){
                // notify about connection error only if we're initiator
                if (connection->a2dp_sink_config_process.outgoing_active) {
                    log_info("A2DP sink signaling connection failed status %d", status);
                    connection->a2dp_sink_config_process.outgoing_active = false;
                    a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                           A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED);
                }
            }

            a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                   A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED);
            log_info("A2DP sink signaling connection established avdtp_cid 0x%02x", avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet));
            break;

        case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:
        case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_MPEG_AUDIO_CONFIGURATION:
        case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_MPEG_AAC_CONFIGURATION:
        case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_ATRAC_CONFIGURATION:
        case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION:
            reconfigure = avdtp_subevent_signaling_media_codec_other_configuration_get_reconfigure(packet) != 0;
            // accept configure if not configured and reconfigure if already configured
            if (a2dp_sink_stream_endpoint_configured != reconfigure) break;
            a2dp_sink_stream_endpoint_configured = true;
            a2dp_sink_cid = avdtp_subevent_signaling_media_codec_other_capability_get_avdtp_cid(packet);
            subevent_id = a2dp_subevent_id_for_avdtp_subevent_id(packet[2]);
            a2dp_replace_subevent_id_and_emit_sink(packet, size, subevent_id);
            break;

        case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED:
            if (a2dp_sink_stream_endpoint_configured == false) break;
            if (a2dp_sink_cid != avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet)) break;

            connection = avdtp_get_connection_for_avdtp_cid(a2dp_sink_cid);
            btstack_assert(connection != NULL);

            // about to notify client
            connection->a2dp_sink_config_process.outgoing_active = false;
            status = avdtp_subevent_streaming_connection_established_get_status(packet);
            if (status != ERROR_CODE_SUCCESS){
                log_info("A2DP sink streaming connection could not be established, avdtp_cid 0x%02x, status 0x%02x ---", a2dp_sink_cid, status);
                a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                       A2DP_SUBEVENT_STREAM_ESTABLISHED);
                break;
            }

            log_info("A2DP streaming connection established --- avdtp_cid 0x%02x, local seid %d, remote seid %d", a2dp_sink_cid,
                avdtp_subevent_streaming_connection_established_get_local_seid(packet),
                avdtp_subevent_streaming_connection_established_get_remote_seid(packet));

            a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                   A2DP_SUBEVENT_STREAM_ESTABLISHED);
            break;

        case AVDTP_SUBEVENT_SIGNALING_ACCEPT:
            if (a2dp_sink_stream_endpoint_configured == false) break;
            if (a2dp_sink_cid != avdtp_subevent_signaling_accept_get_avdtp_cid(packet)) break;

            signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet);
            local_seid = avdtp_subevent_signaling_accept_get_local_seid(packet);

            switch (signal_identifier){
                case  AVDTP_SI_START:
                    a2dp_emit_sink_stream_event(a2dp_sink_cid, local_seid, A2DP_SUBEVENT_STREAM_STARTED);
                    break;
                case AVDTP_SI_SUSPEND:
                    a2dp_emit_sink_stream_event(a2dp_sink_cid, local_seid, A2DP_SUBEVENT_STREAM_SUSPENDED);
                    break;
                case AVDTP_SI_ABORT:
                case AVDTP_SI_CLOSE:
                    a2dp_emit_sink_stream_event(a2dp_sink_cid, local_seid, A2DP_SUBEVENT_STREAM_STOPPED);
                    break;
#ifdef ENABLE_AVDTP_ACCEPTOR_EXPLICIT_START_STREAM_CONFIRMATION
                case AVDTP_SI_ACCEPT_START:
                    a2dp_emit_sink_stream_event(a2dp_sink_cid, local_seid, A2DP_SUBEVENT_START_STREAM_REQUESTED);
                    break;
#endif
                default:
                    break;
            }
            break;

        case AVDTP_SUBEVENT_SIGNALING_REJECT:
            if (a2dp_sink_stream_endpoint_configured == false) break;
            if (a2dp_sink_cid != avdtp_subevent_signaling_reject_get_avdtp_cid(packet)) break;

            a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                   A2DP_SUBEVENT_COMMAND_REJECTED);
            break;

        case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT:
            if (a2dp_sink_stream_endpoint_configured == false) break;
            if (a2dp_sink_cid != avdtp_subevent_signaling_general_reject_get_avdtp_cid(packet)) break;

            a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                   A2DP_SUBEVENT_COMMAND_REJECTED);
            break;

        case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:
            if (a2dp_sink_stream_endpoint_configured == false) break;
            if (a2dp_sink_cid != avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)) break;

            a2dp_sink_stream_endpoint_configured = false;

            a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                   A2DP_SUBEVENT_STREAM_RELEASED);
            break;

        case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:
            cid = avdtp_subevent_signaling_connection_released_get_avdtp_cid(packet);
            connection = avdtp_get_connection_for_avdtp_cid(cid);
            btstack_assert(connection != NULL);

            connection->a2dp_sink_config_process.outgoing_active = false;

            if (a2dp_sink_cid != cid) break;

            a2dp_sink_stream_endpoint_configured = false;

            a2dp_replace_subevent_id_and_emit_sink(packet, size,
                                                   A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED);
            break;
        default:
            break;
    }

}

static uint8_t a2dp_sink_media_config_validator_callback(const avdtp_stream_endpoint_t * stream_endpoint, const uint8_t * event, uint16_t size){
    uint8_t error = 0;
    if (a2dp_sink_media_config_validator != NULL) {
        // update subevent id and call validator
        uint8_t avdtp_subevent_id = event[2];
        uint8_t a2dp_subevent_id = a2dp_subevent_id_for_avdtp_subevent_id(avdtp_subevent_id);
        uint8_t * subevent_field = (uint8_t *) &event[2];
        *subevent_field = a2dp_subevent_id;
        error = (*a2dp_sink_media_config_validator)(stream_endpoint, event, size);
        *subevent_field = avdtp_subevent_id;
    }
    return error;
}

void a2dp_sink_register_media_config_validator(uint8_t (*callback)(const avdtp_stream_endpoint_t * stream_endpoint, const uint8_t * event, uint16_t size)){
    a2dp_sink_media_config_validator = callback;
    avdtp_sink_register_media_config_validator(&a2dp_sink_media_config_validator_callback);
}