fix: Pure virtual function called! crash on seek()

[SleepyWilly]

Description

When seeking a streamed mp3 song, I usually get the following error that closes the flutter app:

E/libc++abi( 9398): Pure virtual function called!
F/libc ( 9398): Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 9398 (mple.home_cloud), pid 9398 (mple.home_cloud)

---

Build fingerprint: 'google/sdk_gphone64_arm64/emu64a:14/UE1A.230829.036.A1/11228894:userdebug/dev-keys'
Revision: '0'
ABI: 'arm64'
Timestamp: 2025-12-04 23:55:01.500727515+0100
Process uptime: 18s
Cmdline: com.example.home_cloud
pid: 9398, tid: 9398, name: mple.home_cloud >>> com.example.home_cloud <<<
uid: 10195
tagged_addr_ctrl: 0000000000000001 (PR_TAGGED_ADDR_ENABLE)
pac_enabled_keys: 000000000000000f (PR_PAC_APIAKEY, PR_PAC_APIBKEY, PR_PAC_APDAKEY, PR_PAC_APDBKEY)
signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
Abort message: 'Pure virtual function called!'
x0 0000000000000000 x1 00000000000024b6 x2 0000000000000006 x3 0000007fd09526a0
x4 0000000000000010 x5 0000000000000010 x6 0000000000000010 x7 7f7f7f7f7f7f7f7f
x8 00000000000000f0 x9 0000007582e27090 x10 0000000000000001 x11 0000007582e7a058
x12 0000000069321145 x13 000000007fffffff x14 00000000001f24d0 x15 000000294a05c2d2
x16 0000007582ee7d08 x17 0000007582ebbe90 x18 0000007587614000 x19 00000000000024b6
x20 00000000000024b6 x21 00000000ffffffff x22 0000007fd09527d0 x23 0000007fd0952810
x24 0000007fd09528f0 x25 0000007fd0952838 x26 b400007460ede360 x27 0000007108d1c890
x28 0000000800000071 x29 0000007fd0952720
lr 0000007582e6b9b8 sp 0000007fd0952680 pc 0000007582e6b9e4 pst 0000000000001000
7 total frames
backtrace:
#00 pc 00000000000669e4 /apex/com.android.runtime/lib64/bionic/libc.so (abort+164) (BuildId: a87908b48b368e6282bcc9f34bcfc28c)
#1 pc 0000000000161108 /data/app/~~rcqF6tlHqHHMAg_bMrzu3A==/com.example.home_cloud-uf2CX46C8rxhOQrQhdRRSw==/lib/arm64/libflutter_soloud_plugin.so (BuildId: 3aac1dfbfcf5ab09b751ed9a67a9e235938f9490)
#2 pc 00000000001760e4 /data/app/~~rcqF6tlHqHHMAg_bMrzu3A==/com.example.home_cloud-uf2CX46C8rxhOQrQhdRRSw==/lib/arm64/libflutter_soloud_plugin.so (__cxa_pure_virtual+20) (BuildId: 3aac1dfbfcf5ab09b751ed9a67a9e235938f9490)
#3 pc 0000000000099964 /data/app/~~rcqF6tlHqHHMAg_bMrzu3A==/com.example.home_cloud-uf2CX46C8rxhOQrQhdRRSw==/lib/arm64/libflutter_soloud_plugin.so (BuildId: 3aac1dfbfcf5ab09b751ed9a67a9e235938f9490)
#4 pc 00000000000b161c /data/app/~~rcqF6tlHqHHMAg_bMrzu3A==/com.example.home_cloud-uf2CX46C8rxhOQrQhdRRSw==/lib/arm64/libflutter_soloud_plugin.so (BuildId: 3aac1dfbfcf5ab09b751ed9a67a9e235938f9490)
#5 pc 0000000000092550 /data/app/~~rcqF6tlHqHHMAg_bMrzu3A==/com.example.home_cloud-uf2CX46C8rxhOQrQhdRRSw==/lib/arm64/libflutter_soloud_plugin.so (seek+60) (BuildId: 3aac1dfbfcf5ab09b751ed9a67a9e235938f9490)
#6 pc 0000000000008004 [anon:dart-code]

Steps To Reproduce

1. Play any mp3 streamed song
2. Seek the song
3. App crashes
4. See error

Expected Behavior

Song seeks to the desired position and continue from that point

Additional Context

Running on Android API 34
Flutter doctor output:
[✓] Flutter (Channel stable, 3.32.8, on macOS 14.6.1 23G93 darwin-arm64, locale es-ES)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[!] Xcode - develop for iOS and macOS (Xcode 16.2)
! iOS 18.2 Simulator not installed; this may be necessary for iOS and macOS development.
To download and install the platform, open Xcode, select Xcode > Settings > Components,
and click the GET button for the required platform.

  For more information, please visit:
    https://developer.apple.com/documentation/xcode/installing-additional-simulator-runtimes

[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.3)
[✓] IntelliJ IDEA Community Edition (version 2023.3.2)
[✓] VS Code (version 1.103.2)
[✓] Connected device (3 available)
[✓] Network resources

[alnitak]

Hi @SleepyWilly, unfortunately, I cannot reproduce this issue.

I have updated the web_radio example by adding a seekbar. Could you please try it and see if the problem comes up? Just replace this line with static const bufferingType = BufferingType.preserved; because the release buffer type doesn't support seeking.

In case you want to do something different instead of getting audio data from the web, please provide me a reproducible code for testing.