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[BUG] stream_start_offset set incorrectly leading to av sync errors #8779
Description
Describe the bug
Branch from Linux SOF driver bug thesofproject/linux#4781
The FW is not reporting correct start offset, which leads to incorrect delay reporting by the SOF driver to application. This can lead to video playback failures with applications using ALSA delay reporting.
To Reproduce
Play a video with mplayer and native ALSA backend:
- e.g. video from https://www.photojoseph.com/tips/2021/3/29/updated-march-2021-downloadable-audiovideo-sync-tests-2398-24-25-2997-50-5994
- play to system speaker: "mplayer -ao alsa:device=hw=0.2 Audio_Video_Sync_23,98_HEVC_1080p-by_PhotoJoseph.mov"
Reproduction Rate
50%
Expected behavior
Video should play reliably with accurate AV sync with applications using ALSA snd_pcm_delay().
Impact
High
Environment
kernel: thesofproject/linux@66ee247 (sof-dev)
SOF: 6c18829 (SOF main)
platform: MTL
topoplogy: sof-mtl-rt713-l0-rt1316-l12.tplg
Activity
kv2019i commentedon Jan 23, 2024
Potentially fixed by #8756
UPDATE: I still get super large delay values reported when I tested this today with the above PR cherry-picked. So cannot confirm this fix yet.
RanderWang commentedon Jan 24, 2024
@kv2019i please help to review this PR: thesofproject/linux#4791, thanks
kv2019i commentedon Jan 31, 2024
The FW part is merged, so let's close this and continue in thesofproject/linux#4781