Hi, I am trying to build an application using ALSA, and which requires low playback delays.
My first idea was to have a small hardware buffer to limit the playout delays. But then if for some reason the buffer gets full, the card stops, and the next writei will block for about one second. My second idea was to have a rather big hw buffer (500ms), and then set the start_threshold to a low value (32 frames for instance). But whatever my parameters were, I always got a playout delay of about the hw buffer size. I think the best way is the second one, but I can't figure out what I did wrong. Here are the parameters I'm using: 20/10 18:56 /proc/asound/card0/pcm0p/sub0% cat hw_params access: RW_INTERLEAVED format: S16_LE subformat: STD channels: 1 rate: 8000 (8000/1) period_size: 32 buffer_size: 4000 tick_time: 1000 20/10 19:12 /proc/asound/card0/pcm0p/sub0% cat sw_params tstamp_mode: NONE period_step: 1 sleep_min: 0 avail_min: 16 xfer_align: 32 start_threshold: 32 stop_threshold: 4000 silence_threshold: 0 silence_size: 0 boundary: 2097152000 I am using a 2.6.0-test3 kernel (preemptive) with the 0.9.6 libasound. My soundcard is a USB Plantronics Headset. The card is open both in PLAYBACK and CAPTURE mode. Thanks, -- Jobi ------------------------------------------------------- This SF.net email is sponsored by OSDN developer relations Here's your chance to show off your extensive product knowledge We want to know what you know. Tell us and you have a chance to win $100 http://www.zoomerang.com/survey.zgi?HRPT1X3RYQNC5V4MLNSV3E54 _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
