On Wed, 12 Aug 2020 08:18:25 +0200,
Vijay Palaniswamy (RBEI/ECF3) wrote:
>
> Hi All,
>
> When dmix uses non-interleaved mixing mode the offset and step width to
> sum_buffer was calculated by using the dmix channels instead of the slave
> channels. This leads to audio distortions due to frame corruption.
>
> Issue happens while doing channel wise mixing of src and destination buffers.
>
> Attached the patch to fix the offset and step width calculation based on slave
> channels for sum buffer. So mixed data will be saved in respective channels of
> sum buffer.
>
> Steps to reproduce the issue:
>
> With below configuratio, Do aplay on both device in parallel for audio
> distortion
>
> pcm.dmix_2_channels {
>
> type dmix
>
> ipc_key 5678293
>
> ipc_perm 0660
>
> ipc_gid audio
>
> bindings [0 1]
>
> slave {
>
> pcm "hardware"
>
> channels 2
>
> periods 4
>
> period_time 40000
>
> }
>
> }
>
> pcm.dmix_1_channels {
>
> type dmix
>
> ipc_key 5678293
>
> ipc_perm 0660
>
> ipc_gid audio
>
> bindings [0]
>
> slave {
>
> pcm "hardware"
>
> channels 1
>
> periods 4
>
> period_time 40000
>
> }
>
> }
>
> pcm.hardware {
>
> type hw
>
> card 0
>
> channels 2
>
> rate 48000
>
> format S16_LE
>
> }
>
> Best regards
>
> Palaniswamy Vijay
Applied now. Thanks.
Takashi
