Hi, FWIW, I currently have no clue what could be the reason for this issue. I copied the linux-usb mailing list, maybe anyone over there has an idea. Summary is: Demian is trying to play back an audio file over an USB connected soundcard, and the file itself is also stored on a media connected via USB. The transfer alone seems to be reasonably fast (tested with 'dd'), and the card itself also works fine (tested with a file stored on a different media), but the combination of them both fails. At least for high sample rates - iow, high data throughput. Could there be anything wrong with the isochronous bandwith reservation? Thanks, Daniel On Sun, Aug 22, 2010 at 04:51:55PM -0700, Demian Martin wrote: > Daniel: > I'll try to provide all the info you want. I'll need some prompting for some > details, please be patient with me. > > First the system. > I have tested on both an intel D945GSEJT atom based MB and an Alis 3.3 AMD > Geode based mb. > OS: Linux auraliti-player 2.6.32auraliti-2.0 #1 PREEMPT Fri Jul 30 06:48:14 > GMT 2010 i686 GNU/Linux > Distro Voyage Linux 0.6.1 > It's a dedicated headless 2 channel audio player, sort of a high performance > squeezebox. Details here: www.auraliti.com > > When I play a file from a network source (connected through nfs) I have no > problems with either .wav or .flac. > > I don't know how to tell with certainty if the USB devices are connecting > through a common or separate root hubs. > > USB stick speed- It took 6.2 seconds to pass a 1 minute 19 second 192/24 > file to dev/null so USB speed is not a problem. > > It seems there is a collision when there is a high speed USB storage device > and the USB class 2 audio on the same host port both moving data at the same > time. > > All of the following were done with the Alix board (Geode 500 MHz > processor). The Intel does similar but seems more likely to work. > > Under some conditions the system loses connection to the USB audio device: > auraliti-player:~# aplay -v -Dplughw:1 > /media/usb0/Trio-Mytek8X192ADDA-192k.WAV > Playing WAVE '/media/usb0/Trio-Mytek8X192ADDA-192k.WAV' : Signed 24 bit > Little Endian in 3bytes, Rate 192000 Hz, Stereo > aplay: set_params:1116: Unable to install hw params: > ACCESS: RW_INTERLEAVED > FORMAT: S24_3LE > SUBFORMAT: STD > SAMPLE_BITS: 24 > FRAME_BITS: 48 > CHANNELS: 2 > RATE: 192000 > PERIOD_TIME: 125000 > PERIOD_SIZE: 24000 > PERIOD_BYTES: 144000 > PERIODS: 4 > BUFFER_TIME: 500000 > BUFFER_SIZE: 96000 > BUFFER_BYTES: 576000 > TICK_TIME: 0 > auraliti-player:~# > > Fixed by disconnecting and reconnecting the device. > > > Here is what I get playing a 44.1 file, after about 15 seconds: > > Playing WAVE '/media/usb0/Piano_44_1.wav' : Signed 24 bit Little Endian in > 3bytes, Rate 44100 Hz, Stereo > Plug PCM: Linear conversion PCM (S32_LE) > Its setup is: > stream : PLAYBACK > access : RW_INTERLEAVED > format : S24_3LE > subformat : STD > channels : 2 > rate : 44100 > exact rate : 44100 (44100/1) > msbits : 24 > buffer_size : 22050 > period_size : 5513 > period_time : 125011 > tstamp_mode : NONE > period_step : 1 > avail_min : 5513 > period_event : 0 > start_threshold : 22050 > stop_threshold : 22050 > silence_threshold: 0 > silence_size : 0 > boundary : 1445068800 > Slave: Hardware PCM card 1 'WaveLink HS SPDIF' device 0 subdevice 0 > Its setup is: > stream : PLAYBACK > access : MMAP_INTERLEAVED > format : S32_LE > subformat : STD > channels : 2 > rate : 44100 > exact rate : 44100 (44100/1) > msbits : 32 > buffer_size : 22050 > period_size : 5513 > period_time : 125011 > tstamp_mode : NONE > period_step : 1 > avail_min : 5513 > period_event : 0 > start_threshold : 22050 > stop_threshold : 22050 > silence_threshold: 0 > silence_size : 0 > boundary : 1445068800 > appl_ptr : 0 > hw_ptr : 0 > underrun!!! (at least 0.015 ms long) > Status: > state : XRUN > trigger_time: 903.806908643 > tstamp : 903.807038997 > delay : 0 > avail : 0 > avail_max : 11028 > aplay: xrun:1259: xrun: prepare error: File descriptor in bad state > auraliti-player:~# > > And the system stops playing. > > And very quickly on a 176.4 file: > > Playing WAVE '/media/usb0/01_Rimsky-Korsakov Dance of the Tumblers.wav' : > Signed 24 bit Little Endian in 3bytes, Rate 176400 Hz, Stereo > Plug PCM: Linear conversion PCM (S32_LE) > Its setup is: > stream : PLAYBACK > access : RW_INTERLEAVED > format : S24_3LE > subformat : STD > channels : 2 > rate : 176400 > exact rate : 176400 (176400/1) > msbits : 24 > buffer_size : 88200 > period_size : 22050 > period_time : 125000 > tstamp_mode : NONE > period_step : 1 > avail_min : 22050 > period_event : 0 > start_threshold : 88200 > stop_threshold : 88200 > silence_threshold: 0 > silence_size : 0 > boundary : 1445068800 > Slave: Hardware PCM card 1 'WaveLink HS SPDIF' device 0 subdevice 0 > Its setup is: > stream : PLAYBACK > access : MMAP_INTERLEAVED > format : S32_LE > subformat : STD > channels : 2 > rate : 176400 > exact rate : 176400 (176400/1) > msbits : 32 > buffer_size : 88200 > period_size : 22050 > period_time : 125000 > tstamp_mode : NONE > period_step : 1 > avail_min : 22050 > period_event : 0 > start_threshold : 88200 > stop_threshold : 88200 > silence_threshold: 0 > silence_size : 0 > boundary : 1445068800 > appl_ptr : 0 > hw_ptr : 0 > underrun!!! (at least 0.010 ms long) > Status: > state : XRUN > trigger_time: 1050.313984810 > tstamp : 1050.314067000 > delay : 0 > avail : 1413 > avail_max : 22071 > aplay: xrun:1259: xrun: prepare error: File descriptor in bad state > auraliti-player:~# > > If in interpose a USB 1 hub on the usb storage I get this: > > auraliti-player:~# aplay -v -Dplughw:1 /media/usb0/01_Rimsky-Korsakov\ > Dance\ of\ the\ Tumblers.wav > Playing WAVE '/media/usb0/01_Rimsky-Korsakov Dance of the Tumblers.wav' : > Signed 24 bit Little Endian in 3bytes, Rate 176400 Hz, Stereo > Plug PCM: Linear conversion PCM (S32_LE) > Its setup is: > stream : PLAYBACK > access : RW_INTERLEAVED > format : S24_3LE > subformat : STD > channels : 2 > rate : 176400 > exact rate : 176400 (176400/1) > msbits : 24 > buffer_size : 88200 > period_size : 22050 > period_time : 125000 > tstamp_mode : NONE > period_step : 1 > avail_min : 22050 > period_event : 0 > start_threshold : 88200 > stop_threshold : 88200 > silence_threshold: 0 > silence_size : 0 > boundary : 1445068800 > Slave: Hardware PCM card 1 'WaveLink HS SPDIF' device 0 subdevice 0 > Its setup is: > stream : PLAYBACK > access : MMAP_INTERLEAVED > format : S32_LE > subformat : STD > channels : 2 > rate : 176400 > exact rate : 176400 (176400/1) > msbits : 32 > buffer_size : 88200 > period_size : 22050 > period_time : 125000 > tstamp_mode : NONE > period_step : 1 > avail_min : 22050 > period_event : 0 > start_threshold : 88200 > stop_threshold : 88200 > silence_threshold: 0 > silence_size : 0 > boundary : 1445068800 > appl_ptr : 0 > hw_ptr : 0 > underrun!!! (at least 1.537 ms long) > Status: > state : XRUN > trigger_time: 1219.804905467 > tstamp : 1219.820257912 > delay : 0 > avail : 88220 > avail_max : 88220 > underrun!!! (at least 13.900 ms long) > Status: > state : XRUN > trigger_time: 1222.763695807 > tstamp : 1222.902684537 > delay : 0 > avail : 66169 > avail_max : 88219 > underrun!!! (at least 1.279 ms long) > Status: > state : XRUN > trigger_time: 1225.972436940 > tstamp : 1225.985216250 > delay : 0 > avail : 88221 > avail_max : 88221 > underrun!!! (at least 14.141 ms long) > > etc. until I stop the playback. > > 44.1 playback is fine under these conditions (but then why USB audio class > 2?) > > Further, using MPD for playback I have discovered that the high bit rate > flac files play fine but the same files as wave have the same type of > stall/stop problems. > > I tried Windows on the Intel platform with similar problems using windows > media player but no problems with VLC. However with Windows it is not easy > to know what is really going on inside. > > Is it possible that the essentially synchronous nature of playing a wave > file from USB source to USB Audio device causes a collision since the data > is going both ways at essentially the same rate and timing? > > Let me know what other info you need. > > Thanks for looking at this. > -Demian > > > > > -----Original Message----- > From: Daniel Mack [mailto:daniel@xxxxxxxx] > Sent: Saturday, August 21, 2010 2:27 AM > To: Demian Martin > Cc: alsa-devel@xxxxxxxxxxxxxxxx > Subject: Re: Problem with USB Class 2 Audio Driver > > On Fri, Aug 20, 2010 at 05:40:22PM -0700, Demian Martin wrote: > > I'm testing an early sample of the Wavelength Wavelink, a USB to S/PDIF > > adapter that supports 44.1-192 KHz sample rates and uses async usb to talk > > to ALSA. It works and plays all of the sample rates correctly with the git > > version of Alsa from 7/30/2010 whenthe files are sourced from the network. > > What do you mean by "from the network"? How does your test setup look > like? > > > However if I try to play from a usb source to the usb dac it doesn't work > > and the whole system gets unstable. > > You could also be more precise here :) What doesn't work, how are you > testing, and in which regard does the system get unstable? > > > The platforms I have tested it on seem > > to have a single USB host interface but with USB 2 there should be enough > > bandwidth to pass the data from a USB stick to the cpu and back. If I use > an > > older 96 only usb dac on the same system it works (unless the down > > conversion isn't a direct divide, which overloads the CPU, but that is a > > different issue). The problem seems to be sample rate independent and hits > > the moment I try to access the file. This is using MPD as a player. > > Ah, so your data file is stored on a media which is also connected to > USB? Did you connect the two devices to different USB ports or do they > share one uplink with a hub? > > > What additional info do you need to troubleshoot this? Is it an intrinsic > > limitation to the interface? What additional tests should I do? It's > > possible it's a hardware issue but how do I divide them so I can go back > to > > the hardware guy if it's his issue? > > I'm not aware of any limitation, but there could be such issues as > exceeded bandwith on the bus and the like. How many audio channels are > we talking about? > > You could measure the speed of your USB media by using something like > this: > > $ time dd if=/path/to/192khz.file of=/dev/null > > This should take significantly less time than - let's say - half the > real-time audio playback time of the file, so there's enough headroom to > transport the audio data back to the USB DAC. > > What kind of system is this, after all? Did you try other OS on the same > hardware for comparsion? > > > Daniel > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
