On Thu, 17 Jul 2003, Chris Raphael wrote:
>
> Jaroslav, Thanks for your reply. I looked at the section of code you
> pointed to and wondered if you meant I should use
> snd_pcm_sw_params_stop_threshold()
> rather than start_threshold, as you suggested.
> I couldn't actually get snd_pcm_sw_params_get_boundary() to work since
> it wouldn't compile for me, but I tried various boundary values for the stop
You have use these defines before #include <alsa/asoundlib.h> to enable
newer API:
#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API
> threshold. When doing this, I managed to eliminate the underruns. However,
> when my sample-writing routine is invoked by a late signal, then some strange
> noise creeps into my output audio and never goes away. I don't understand this
> since I am replenishing the buffer with new audio so I would expect the noise
> to go away as soon as it is overwritten.
>
> Maybe I should ask the question in a more open-ended way. I have both incoming
> and outgoing audio and the two drift apart when I get playing underruns.
> Although it is not really the case, you could think of the outgoing audio as
> "echoing" the incoming audio. Why does this happen and what can I do about it?
I am sorry, but I have no idea... The playback has probably also
underruns, so you have to fill buffer ahead again when this
happens.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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