btstack/example/avrcp_browsing_client.c

/*
 * 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 MATTHIAS
 * RINGWALD 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 
 * contact@bluekitchen-gmbh.com
 *
 */

#define __BTSTACK_FILE__ "avrcp_browsing_client.c"

/*
 * avrcp_browsing_client.c
 */

// *****************************************************************************
/* EXAMPLE_START(avrcp_browsing_client): Browse media players and media information on a remote device.
 *
 * @text This example demonstrates how to use the AVRCP Controller Browsing service to 
 * browse madia players and media information on a remote AVRCP Source device. 
 *
 * @test To test with a remote device, e.g. a mobile phone,
 * pair from the remote device with the demo, then use the UI for browsing (tap 
 * SPACE on the console to show the available AVRCP commands).
 *
 */
// *****************************************************************************

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

#include "btstack.h"
#include "avrcp_browsing_controller.h"

#ifdef HAVE_BTSTACK_STDIN
#include "btstack_stdin.h"
#endif

#ifdef HAVE_BTSTACK_STDIN
// mac 2011: static bd_addr_t remote = {0x04, 0x0C, 0xCE, 0xE4, 0x85, 0xD3};
// pts: static bd_addr_t remote = {0x00, 0x1B, 0xDC, 0x08, 0x0A, 0xA5};
// mac 2013: 
// static const char * device_addr_string = "84:38:35:65:d1:15";
// iPhone 5S: static const char * device_addr_string = "54:E4:3A:26:A2:39";
// phone 2013:  
static const char * device_addr_string = "D8:BB:2C:DF:F1:08";
static bd_addr_t device_addr;
#endif

static uint16_t avrcp_cid = 0;
static uint8_t  avrcp_connected = 0;

static uint16_t browsing_cid = 0;
static uint8_t  avrcp_browsing_connected = 0;
static uint8_t  sdp_avrcp_browsing_controller_service_buffer[200];

static btstack_packet_callback_registration_t hci_event_callback_registration;

static uint8_t ertm_buffer[10000];
static l2cap_ertm_config_t ertm_config = {
    1,  // ertm mandatory
    2,  // max transmit, some tests require > 1
    2000,
    12000,
    144,    // l2cap ertm mtu
    4,
    4,
};


/* @section Main Application Setup
 *
 * @text The Listing MainConfiguration shows how to setup AVRCP Controller Browsing service. 
 * To announce AVRCP Controller Browsing service, you need to create corresponding
 * SDP record and register it with the SDP service. 
 * You'll also need to register several packet handlers:
 * - stdin_process callback - used to trigger AVRCP commands, such are get media players, playlists, albums, etc. Requires HAVE_BTSTACK_STDIN.
 * - avrcp_browsing_controller_packet_handler - used to receive answers for AVRCP commands.
 *
 */

/* LISTING_START(MainConfiguration): Setup Audio Sink and AVRCP Controller services */
static void avrcp_browsing_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
#ifdef HAVE_BTSTACK_STDIN
static void stdin_process(char cmd);
#endif

#define BROWSING_ENABLED 1

int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
    (void)argc;
    (void)argv;

    // Register for HCI events.
    hci_event_callback_registration.callback = &avrcp_browsing_controller_packet_handler;
    hci_add_event_handler(&hci_event_callback_registration);

    // Initialize L2CAP.
    l2cap_init();
    
    // Initialize AVRCP Controller.
    avrcp_controller_init();
    // Register AVRCP for HCI events.
    avrcp_controller_register_packet_handler(&avrcp_browsing_controller_packet_handler);
    
    // Initialize AVRCP Browsing Controller, HCI events will be sent to the AVRCP Controller callback. 
    avrcp_browsing_controller_init();
    // // Register AVRCP for HCI events.
    // avrcp_browsing_controller_register_packet_handler(&avrcp_browsing_controller_packet_handler);
    
    // Initialize SDP. 
    sdp_init();

    // Create AVRCP service record and register it with SDP.
    memset(sdp_avrcp_browsing_controller_service_buffer, 0, sizeof(sdp_avrcp_browsing_controller_service_buffer));
    avrcp_controller_create_sdp_record(sdp_avrcp_browsing_controller_service_buffer, 0x10001, BROWSING_ENABLED, 1, NULL, NULL);
    sdp_register_service(sdp_avrcp_browsing_controller_service_buffer);
    
    // Set local name with a template Bluetooth address, that will be automatically
    // replaced with a actual address once it is available, i.e. when BTstack boots
    // up and starts talking to a Bluetooth module.
    gap_set_local_name("AVRCP Browsing Client 00:00:00:00:00:00");
    gap_discoverable_control(1);
    gap_set_class_of_device(0x200408);
    
#ifdef HAVE_BTSTACK_STDIN
    // Parse human readable Bluetooth address.
    sscanf_bd_addr(device_addr_string, device_addr);
    btstack_stdin_setup(stdin_process);
#endif
    printf("Starting BTstack ...\n");
    hci_power_control(HCI_POWER_ON);
    return 0;
}
/* LISTING_END */


static void avrcp_browsing_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    UNUSED(channel);
    UNUSED(size);
    if (packet_type != HCI_EVENT_PACKET) return;
    if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return;
    
    uint16_t local_cid;
    uint8_t  status = 0xFF;
    bd_addr_t adress;
    
    switch (packet[2]){
        case AVRCP_SUBEVENT_CONNECTION_ESTABLISHED: {
            local_cid = avrcp_subevent_connection_established_get_avrcp_cid(packet);
            if (browsing_cid != 0 && browsing_cid != local_cid) {
                printf("AVRCP Browsing Client: AVRCP Controller connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", browsing_cid, local_cid);
                return;
            }

            status = avrcp_subevent_connection_established_get_status(packet);
            if (status != ERROR_CODE_SUCCESS){
                printf("AVRCP Browsing Client: AVRCP Controller connection failed: status 0x%02x\n", status);
                browsing_cid = 0;
                return;
            }
            
            avrcp_cid = local_cid;
            avrcp_connected = 1;
            avrcp_subevent_connection_established_get_bd_addr(packet, adress);
            printf("AVRCP Browsing Client: AVRCP Controller Channel successfully opened: %s, avrcp_cid 0x%02x\n", bd_addr_to_str(adress), avrcp_cid);
            return;
        }
        case AVRCP_SUBEVENT_CONNECTION_RELEASED:
            printf("AVRCP Browsing Client: AVRCP Controller Channel released: avrcp_cid 0x%02x\n", avrcp_subevent_connection_released_get_avrcp_cid(packet));
            browsing_cid = 0;
            avrcp_browsing_connected = 0;
            return;

        case AVRCP_SUBEVENT_BROWSING_CONNECTION_ESTABLISHED: {
            local_cid = avrcp_subevent_browsing_connection_established_get_browsing_cid(packet);
            if (browsing_cid != 0 && browsing_cid != local_cid) {
                printf("AVRCP Browsing Client: AVRCP Browsing Controller Connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", browsing_cid, local_cid);
                return;
            }

            status = avrcp_subevent_browsing_connection_established_get_status(packet);
            if (status != ERROR_CODE_SUCCESS){
                printf("AVRCP Browsing Client: AVRCP Browsing Controller Connection failed: status 0x%02x\n", status);
                browsing_cid = 0;
                return;
            }
            
            browsing_cid = local_cid;
            avrcp_browsing_connected = 1;
            avrcp_subevent_browsing_connection_established_get_bd_addr(packet, adress);
            printf("AVRCP Browsing Client: AVRCP Browsing Controller Channel successfully opened: %s, browsing_cid 0x%02x\n", bd_addr_to_str(adress), browsing_cid);
            return;
        }
        case AVRCP_SUBEVENT_BROWSING_CONNECTION_RELEASED:
            printf("AVRCP Browsing Client: AVRCP Browsing Controller Channel released: browsing_cid 0x%02x\n", avrcp_subevent_browsing_connection_released_get_browsing_cid(packet));
            browsing_cid = 0;
            avrcp_browsing_connected = 0;
            return;
        default:
            printf("AVRCP Browsing Client: event is not parsed\n");
            break;
    }
}

#ifdef HAVE_BTSTACK_STDIN
static void show_usage(void){
    bd_addr_t      iut_address;
    gap_local_bd_addr(iut_address);
    printf("\n--- Bluetooth AVRCP Controller Connection Test Console %s ---\n", bd_addr_to_str(iut_address));
    printf("a      - AVRCP Controller create connection to addr %s\n", bd_addr_to_str(device_addr));
    printf("c      - AVRCP Browsing Controller create connection to addr %s\n", bd_addr_to_str(device_addr));
    printf("C      - AVRCP Browsing Controller disconnect\n");
    printf("A      - AVRCP Controller disconnect\n");
    printf("p      - Get player list\n");
    printf("---\n");
}
#endif


#ifdef HAVE_BTSTACK_STDIN
static void stdin_process(char cmd){
    uint8_t status = ERROR_CODE_SUCCESS;
    
    switch (cmd){
        case 'a':
            printf(" - Create AVRCP connection for control to addr %s.\n", bd_addr_to_str(device_addr));
            status = avrcp_controller_connect(device_addr, &avrcp_cid);
            break;
        case 'A':
            if (avrcp_connected){
                printf(" - AVRCP Controller disconnect from addr %s.\n", bd_addr_to_str(device_addr));
                status = avrcp_controller_disconnect(avrcp_cid);
                break;
            }
            printf("AVRCP Controller already disconnected\n");
            break;

        case 'c':
            if (!avrcp_connected) {
                printf(" You must first create AVRCP connection for control to addr %s.\n", bd_addr_to_str(device_addr));
                break;
            }
            printf(" - Create AVRCP connection for browsing to addr %s.\n", bd_addr_to_str(device_addr));
            status = avrcp_browsing_controller_connect(device_addr, ertm_buffer, sizeof(ertm_buffer), &ertm_config, &browsing_cid);
            break;
        case 'C':
            if (avrcp_browsing_connected){
                printf(" - AVRCP Browsing Controller disconnect from addr %s.\n", bd_addr_to_str(device_addr));
                status = avrcp_browsing_controller_disconnect(browsing_cid);
                break;
            }
            printf("AVRCP Browsing Controller already disconnected\n");
            break;
        
        case 'p':
            printf("AVRCP Browsing: get player list\n");
            avrcp_browsing_controller_get_player_list(browsing_cid);
            break;
            
        case '\n':
        case '\r':
            break;
        default:
            show_usage();
            return;
    }

    if (status != ERROR_CODE_SUCCESS){
        printf("Could not perform command, status 0x%2x\n", status);
    }
}
#endif
/* EXAMPLE_END */