Describe the bug

Playback the file captured from "device 27: DMIC0 RTC AEC" with CONFIG_GOOGLE_RTC_AUDIO_PROCESSING_MOCK=y, and hear the speed is doubled.

To Reproduce

Start spk playback:

aplay -Dhw:0,1 -c2 -r48000 -fS16_LE /home/LR.wav -vv

Start spk feedback capture:

arecord -Dhw:0,29 /tmp/tmp.wav -c2 -r48000 -fs32_le -vv

Start AEC capture:

arecord -Dhw:0,27 /tmp/mock_aec.wav -c4 -r48000 -fs32_le -vv -d20

Reproduction Rate
100%

Environment

1. Branch name and commit hash of the 2 repositories: sof (firmware/topology) and linux (kernel driver).

   • Kernel: {https://chromium.googlesource.com/chromiumos/third_party/kernel/+/refs/heads/chromeos-6.1}
   • SOF: {MTL-005.0.3 release} https://github.com/thesofproject/sof/releases/tag/releases%2Fmtl%2Fv5.0.3
   • rimage: RanderWang/rimage@bbdbf09

2. Name of the topology file

   • Topology: {sof-mtl-max98357a-rt5682-ssp2-ssp0.tplg} plus
     topology2: fixup google aec topology #7970

3. Name of the platform(s) on which the bug is observed.

   • Platform: {MTL/Rex}

Please also include the relevant sections from the firmware log and kernel log in the report (and attach the full logs for complete reference).

mtrace.txt
dmesg-mock-aec.txt
mock_aec.zip