How to play two songs on Auracast

[chelalv]

I need to add a subgroup in a BIG and play two songs.
I added subgroups=[bap.BasicAudioAnnouncement.Subgroup(),bap.BasicAudioAnnouncement.Subgroup()] in auracast.py
After I synced this BIG with headphones, I could see two subgroups.
Broadcast: F0:F1:F2:F3:F4:F5 ESTABLISHED
Name: bumble
RSSI: -19
SID: 0
Broadcast ID: 123456
Audio:
Presentation Delay: 40000 µs
Subgroup:
Codec ID:
Coding Format: LC3
Company ID: 0
Vendor Specific Codec ID: 0
Codec Config:
Sampling Frequency: 48000 hz
Frame Duration: 10000 µs
Frame Size: 100 bytes
Metadata:
LANGUAGE: eng
PROGRAM_INFO: Disco
BIS [1]:
Codec Config:
Audio Location: FRONT_LEFT
BIS [2]:
Codec Config:
Audio Location: FRONT_RIGHT
Subgroup:
Codec ID:
Coding Format: LC3
Company ID: 0
Vendor Specific Codec ID: 0
Codec Config:
Sampling Frequency: 48000 hz
Frame Duration: 10000 µs
Frame Size: 100 bytes
Metadata:
LANGUAGE: eng
PROGRAM_INFO: Jazz
BIS [3]:
Codec Config:
Audio Location: FRONT_LEFT
BIS [4]:
Codec Config:
Audio Location: FRONT_RIGHT
BIG:
Number of BIS: 2
ISO Interval: 8
Max PDU: 100
SDU Interval: 10000
Max SDU: 100
PHY: LE_2M
Framed: False
Encrypted: False
But there is only music on one track. How can I add another track?

[chelalv]

Solution: Mainly modify the run_transmit function, add a subgroup, add one audio input, create a BIG with 4 BIS, put audio to BIS.