"TI" == Takashi Iwai tiwai@suse.de writes:
TI> At Tue, 18 Sep 2007 09:41:48 +0200 (CEST), TI> Anders Boström wrote:
> "TI" == Takashi Iwai tiwai@suse.de writes:
can one please have a lokk at this? aplay -N isn't working for the OP.
TI> Cannot reproduce here. Could you _post_ more details?
OK, I've tested more, and discovered that the problem seems to be that the end of the sound is cut in non-blocking mode. And if I play a very short sound-file, I can't hear anything. Blocking mode works fine.
When using non-blocking mode, an strace contains "ioctl(4, 0x4144, 0x2b9f785d8000) = -1 EAGAIN (Resource temporarily unavailable)". Blocking mode never contains the EAGAIN response.
I attach two files. When playing halt.au, I can only hear the start, about as much as "ha". When playing metal.au, I can't hear anything.
TI> OK, thanks, I see the problem now.
TI> I don't remember whether it's a feature or a bug. The drain ioctl TI> rejects the non-block mode.
I can understand the idea here, that in non-blocking mode, no call should block, ever. But on the other hand, if you call the drain ioctl, you probably expect it to work, even in non-blocking mode. Why would you otherwise call it?
TI> Anyway, a simple patch is below. Let me know if it works.
It works fine! Thanks!
/ Anders
TI> diff -r 0028e39ead78 core/pcm_native.c TI> --- a/core/pcm_native.c Tue Sep 18 00:52:38 2007 +0200 TI> +++ b/core/pcm_native.c Tue Sep 18 17:44:31 2007 +0200 TI> @@ -1368,8 +1368,6 @@ static int snd_pcm_prepare(struct snd_pc
TI> static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) TI> { TI> - if (substream->f_flags & O_NONBLOCK) TI> - return -EAGAIN; substream-> runtime->trigger_master = substream; TI> return 0; TI> }