On Thu, Jul 10, 2003 at 02:15:25PM +0100, James Courtier-Dutton wrote:
> Why don't you just use /proc/asound to gather all the info you need,
> like buffer and period sizes.
> E.g.
> While playing a sound file: -
> cat /proc/asound/oss/sndstat
> cat /proc/asound/card0/pcm0p/info
>
> cat /proc/asound/card0/pcm0p/sub0/hw_params
> cat /proc/asound/card0/pcm0p/sub0/info
> cat /proc/asound/card0/pcm0p/sub0/status
> cat /proc/asound/card0/pcm0p/sub0/sw_params
>
> If recording a sound, use pcm0c instead of pcm0p
I am recording. This is the result:
>cat /proc/asound/oss/sndstat
Sound Driver:3.8.1a-980706 (ALSA v0.9.4 emulation code)
Kernel: Linux ansset 2.5.74-debug #3 Wed Jul 9 14:16:52 CEST 2003 i686
Config options: 0
Installed drivers:
Type 10: ALSA emulation
Card config:
Sound Blaster Live! (rev.8) at 0xa400, irq 9
Audio devices:
0: EMU10K1 (DUPLEX)
Synth devices: NOT ENABLED IN CONFIG
Midi devices:
0: EMU10K1 MPU-401 (UART)
Timers:
7: system timer
Mixers:
0: TriTech TR28602
>cat /proc/asound/card0/pcm0c/info
card: 0
device: 0
subdevice: 0
stream: CAPTURE
id: emu10k1
name: EMU10K1
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 0
>cat /proc/asound/card0/pcm0c/sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 1
rate: 22050 (22050/1)
period_size: 512
buffer_size: 1024
tick_time: 1000
OSS format: S16_LE
OSS channels: 1
OSS rate: 22050
OSS period bytes: 1024
OSS periods: 2
>cat /proc/asound/card0/pcm0c/sub0/status
state: XRUN
trigger_time: 1057875818.000705646
tstamp : 1057875855.000974402
delay : 0
avail : 1024
avail_max : 0
-----
hw_ptr : 1536
appl_ptr : 512
>cat /proc/asound/card0/pcm0c/sub0/sw_params
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 512
xfer_align: 1
start_threshold: 1
stop_threshold: 1024
silence_threshold: 0
silence_size: 0
boundary: 1073741824
At this moment the application (of which I have no source code
thus) is calling
audio_buf_info info;
ioctl(fd, SNDCTL_DSP_GETISPACE, &info);
in a loop and get returned in 'info'
that there is no data to be read (info.bytes == 0).
This seems to be caused by the fact that more than 2048
bytes of data were available before the application started
to actually read data; and because there is only a buffer
of 2048 bytes:
OSS period bytes: 1024
OSS periods: 2
Increasing the number of 'periods' would be nice.
But I have no idea why I only GET 2 period - the request is
for 'as much as possible' (0x7fff).
See the call
res = 0x7fff000a;
if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &res) == -1)
in my test program.
Changing that value to say '0x4000a' also just gives 2 'periods'
instead of the requested 4.
Can you please analyse the data of /proc/asound above
and give a new hint of what to do next?
--
Carlo Wood <[EMAIL PROTECTED]>
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