Re: usb-audio

[Takashi Iwai <tiwai@suse.de>]

At Tue, 28 Oct 2003 20:18:35 +0100,
Niklas Werner wrote:
> 
> Here we go again,
> 
> Am Dienstag, 28. Oktober 2003 19:25 schrieb Takashi Iwai:
> 
> > > hmm, then something wrong in the converter routine...
> > > needs to take a deeper look.
> >
> > i found a bug regarding the plugin but it must be another bug from the
> > above problem.
> >
> > segfault is a bit puzzling.  could you try the attached patch to see
> > the parameters?  or, even better, check the values in gdb's
> > backtrace.
> 
> Building audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
> Video: no video
> Starting playback...
> XXX linear_convert: dst=0x104d3dc0/0, src=0x7fffc020/0, ch=2, 
> frames=16384, idx=35
> 
> ===========
> gdb:
> 
> Starting playback...
> XXX linear_convert: dst=0x104d1f18/0, src=0x7fffcf40/0, ch=2, 
> frames=16384, idx=       35
> 
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 16384 (LWP 14666)]
> snd_pcm_linear_convert (dst_areas=0x104d1f18, dst_offset=0, 
>     src_areas=0x7fffcf40, src_offset=0, channels=2, frames=16384, 
> convidx=35)
>     at plugin_ops.h:299
> 299     conv_1234_xx21: as_u16(dst) = bswap_16(as_u32c(src) >> 16); goto 
> CONV_EN       D;

hmm, it seems that a wrong label is used.  the label should be
conv_xx12_xx21 (= conv_labels[35]).  something is really broken.

could you check stepwise the loop there?


> >
> >
> > also, what happens if running mplayer with mmap option, i.e.
> >
> > 	% mplayer -ao alsa9:emi26:mmap
> >
> horrible, distorted sound: (sounds like computer is too slow to deliver 
> the samples)
> ALSA lib pcm_hw.c:494:(snd_pcm_hw_start) SNDRV_PCM_IOCTL_START failed: Die 
> Dateizugriffsnummer ist ein schlechter Verfassung 
> 
> meaning: "File descriptor in bad state" (whoever sneaked in this 
> translation...)

(well, good to learn german, at least ;)

thanks for check.
can you hear a clear sound with aplay -M ?


Takashi


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