At Sun, 18 Aug 2002 21:34:52 -0500 (CDT),
Josh Hattery wrote:
>
> Hi,
>
> In my previous post I referred to an error message given by xmms (w/
> alsa-xmms plugin). Since then I set up mplayer and when I started to play
> a divx file the exact same error came up. Here's the output of both:
>
> hobbz@graviton:~$ xmms
> xmms: simple.c:1376: snd_mixer_selem_get_playback_volume: Assertion
> `(unsigned int) channel < s->str[0].channels' failed.
> Aborted
>
> hobbz@graviton:~$ gmplayer -vo xv -ao alsa9
>
> MPlayer CVS-020817-00:00-2.95.4 (C) 2000-2002 Arpad Gereoffy (see DOCS!)
>
> CPU: Advanced Micro Devices Athlon 4 PM Palomino/Athlon MP
> Multiprocessor/Athlon XP eXtreme Performance (Family: 6, Stepping: 2)
> CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
> Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE
>
> <snip some junk>
>
> Playing /path/to/somedivx.avi
> Detected AVI file format!
> VIDEO: [DIV3] 640x360 24bpp 25.00 fps 956.8 kbps (116.8 kbyte/s)
> Clip info:
> Software: xxx
> Name: xxx
> Subject: xxx
> Artist: xxx
> Copyright: xxx
> Comments: xxx
> Detected audio codec: [a52] afm:14 (AC3-liba52)
> Opening audio decoder: [liba52] AC3-liba52
> Using SSE optimized IMDCT transform
> AC3: 2.0 (dolby) 48000 Hz 192.0 kbit/s
> Using MMX optimized resampler
> AUDIO: 48000 Hz, 2 ch, sfmt: 0x10 (2 bps), ratio: 24000->192000 (192.0
> kbit)
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> libavcodec: CPU flags: mmx mmxext 3dnow
> Detected video codec: [ffdivx] vfm:5 (FFmpeg DivX ;-) (MS MPEG-4 v3))
> ==========================================================================
> gmplayer: simple.c:1376: snd_mixer_selem_get_playback_volume: Assertion
> `(unsigned int) channel < s->str[0].channels' failed.
>
> There are two simple.c files under alsa-lib/. The one this refers to is
> src/mixer/simple.c. I've noted line 1376 below.
>
> int snd_mixer_selem_get_playback_volume(snd_mixer_elem_t *elem,
> snd_mixer_selem_channel_id_t channel, long *value)
> {
> selem_t *s;
> assert(elem);
> assert(elem->type == SND_MIXER_ELEM_SIMPLE);
> s = elem->private_data;
> assert((unsigned int) channel < s->str[PLAY].channels); /* Line 1376 */
> assert(s->caps & (CAP_PVOLUME|CAP_GVOLUME));
> if (s->caps & CAP_PVOLUME_JOIN)
> channel = 0;
> *value = s->str[PLAY].vol[channel];
> return 0;
> }
>
> I'm using a Soundblaster Extigy and the snd-usb-audio driver from
> alsa-drivers.
>
> I just installed the alsa drivers, libs, and utils on my roommate's
> machine with no problem. The only real difference between our setups is
> that he has an SB Live! Platinum. So I think the error must originate
> somewhere in the usb code or the way the data is being returned by the
> kernel driver. Then again, I'm still just a squire when it comes to
> coding.
>
> Anyone have any insight?
it's involved most likely with the control (mixer) elements.
perhaps exdigy has no "Master" volume element or something like that,
which is referred as default.
IIRC, a similar bug appears when you use xmms-alsa on powermac
driver.
hence, if my guess is correct, it's a bug of alsa-lib, not of the
kernel driver.
Takashi
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