At Mon, 21 Apr 2008 19:27:45 +0530, Harsha priya gupta wrote:

Hi, I am trying to implement the .copy function of playack_ops in my driver. But when I try playing an mp3 file, my .copy's function code path was executing. Suddenly I do not see that function being called. Can anyone help me understand when the following code path will be executed

snd_pcm_lib_write_transfer substream->ops->copy

Do you use a mmap method? If so, the copy callback won't be called. The copy callback is only for copying the data from the user-space buffer to the driver buffer, which is skipped via mmap.

Takashi