Hello,
I'm using ALSA to develop an audio-streaming application. I try to use start_threshold and stop_threshold in combination with small buffers. However, I think I probably found a bug about this. I'm setting start_threshold=100 and stop_threshold=50. I'm also using a buffer of 44 frames. When I call snd_pcm_writei(the_small_44_frames_buffer), pcm state came to XRUN from PREPARED directly. I think this is a bug because the stream hasn't started. It's hard to say a xrun occurred while stream not started. I'm wondering if this is a ALSA-bug or a misuse of ALSA. A simple bug test program is attached. Thank you very much!
Zhang Boyang
p.s. I dug into kernel code. After writting hardware buffer, __snd_pcm_lib_xfer() called snd_pcm_update_state(), which set the XRUN state.