[bluez/bluez] 4f1054: BASS: support for encrypted broadcast source

[bluez/bluez] 4f1054: BASS: support for encrypted broadcast source

[github-actions[bot]]

  Branch: refs/heads/970719
  Home:   https://github.com/bluez/bluez
  Commit: 4f105421ced5afad0fdb188cbe08ba902be70010
      https://github.com/bluez/bluez/commit/4f105421ced5afad0fdb188cbe08ba902be70010
  Author: Yang Li <yang.li@amlogic.com>
  Date:   2025-06-11 (Wed, 11 Jun 2025)

  Changed paths:
    M profiles/audio/bass.c
    M src/shared/bass.c

  Log Message:
  -----------
  BASS: support for encrypted broadcast source

If the BIS is encrypted as indicated in the BIG Info Report, the
broadcast code needs to be requested from the Assistant.

step 1: Broadcast_Code required
  > HCI Event: LE Meta Event (0x3e) plen 20                 #631 [hci0] 27.176606
        LE Broadcast Isochronous Group Info Advertising Report (0x22)
          Sync Handle: 0x0000
          Number BIS: 2
          NSE: 8
          ISO Interval: 20.00 msec (0x0010)
          BN: 2
          PTO: 2
          IRC: 2
          Maximum PDU: 60
          SDU Interval: 10000 us (0x002710)
          Maximum SDU: 60
          PHY: LE 2M (0x02)
          Framing: Unframed (0x00)
          Encryption: 0x01
  < ACL Data TX: Handle 16 flags 0x00 dlen 44               #633 [hci0] 27.184478
        ATT: Handle Value Notification (0x1b) len 39
          Handle: 0x005f Type: Broadcast Receive State (0x2bc8)
            Data[37]: 01016698a411bb13019f103b02010100000000110d03506978656c20395f32303938020502
            Source_ID: 1
            Source_Address_Type: 1
            Source_Address: 13:BB:11:A4:98:66
            Source_Adv_SID: 1
            Broadcast_ID: 0x3b109f
            PA_Sync_State: Synchronized to PA
            BIG_Encryption: Broadcast_Code required
            Num_Subgroups: 1
            Subgroup #0:
              BIS_Sync State: 0x00000000
              Metadata: #0: len 0x0d type 0x03
              Metadata:   50 69 78 65 6c 20 39 5f 32 30 39 38              Pixel 9_2098
              Metadata: #1: len 0x02 type 0x05
              Metadata:   02
  > ACL Data RX: Handle 16 flags 0x02 dlen 25               #636 [hci0] 27.455744
        ATT: Write Command (0x52) len 20
          Handle: 0x0065 Type: Broadcast Audio Scan Control Point (0x2bc7)
            Data[18]: 04013a4931614b3a2b7c4b7431722b666724
              Opcode: Set Broadcast_Code (0x04)
              Source_ID: 1
              Broadcast_Code[16]: 3a4931614b3a2b7c4b7431722b666724

step 2: Set Broadcast Code when BIG Create Sync
  < HCI Command: LE Broadcast Isoc.. (0x08|0x006b) plen 26  #641 [hci0] 27.669211
          BIG Handle: 0x00
          BIG Sync Handle: 0x0000
          Encryption: Encrypted (0x01)
          Broadcast Code[16]: 3a4931614b3a2b7c4b7431722b666724
          Maximum Number Subevents: 0x00
          Timeout: 20000 ms (0x07d0)
          Number of BIS: 2
          BIS ID: 0x01
          BIS ID: 0x02

Fixes: https://github.com/bluez/bluez/issues/1306



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