Ok I managed to get rid of that garbled background noise now I get underrun messages... $ aplay -D hw:2,1 5_5_2006__07_00_59.wav Playing WAVE '5_5_2006__07_00_59.wav' : Signed 16 bit Little Endian, Rate 9600 Hz, Mono underrun!!! (at least 0,271 ms long) underrun!!! (at least 0,248 ms long) [...] I can hear the sound clearly, but looks like these 200ms cause a choppy sound... I also tried to add support for this device to snd-usb-audio, but since this device has no synchronisation packets the driver fails... Does anyone know what causes such a buffer underrun? I think it still has something to do with the snd_pcm_hardware_t values... maybe the time will come when I'm not the only one on this ML who answers my questions.... Markus On 8/6/06, Markus Rechberger <mrechberger@xxxxxxxxx> wrote: > I did some more investigation uppon this > > .buffer_bytes_max = (32*1024), > this one seems to be clear now, I set it to the max > transfer_buffer_size of 1 URB > > .period_bytes_min = 64, > this one not .. in my case I set it to transfer_buffer_size/2 > > .period_bytes_max = 2048, > this one is again transfer_buffer > > .periods_min = 1, > I set this one to 2 (people in IRC cleared me up about this one) > > .periods_max = 255, > no idea again.. > > So what I get now is: > http://lost-souls.mercuryserver.de/files/data/test.wav.mp3 > > and a buffer underrun regarding aplay > aplay -D hw:2,1 5_5_2006__07_00_59.wav > Playing WAVE '5_5_2006__07_00_59.wav' : Signed 16 bit Little Endian, > Rate 9600 Hz, Mono > underrun!!! (at least 0,307 ms long) > underrun!!! (at least 0,285 ms long) > underrun!!! (at least 0,295 ms long) > underrun!!! (at least 0,279 ms long) > underrun!!! (at least 0,298 ms long) > underrun!!! (at least 0,287 ms long) > > the strange thing here is the DTMF tones in the background sound fine, > so I don't really recognize an underrun when playing the file just > that strange noise which is constant all the time.. > > following is what my debug prints in dmesg: > I'm sure the PCM PLAYBACK TRIGGER STOP! are caused by the buffer > underrun which is reported by aplay.. > The outgoing dataformat is 9600hz, S16_LE, mono .. > > memcpy3 384 - 0-- > ed ff ee ff ed ff f3 ff f2 ff f5 ff fa ff fa ff ff ff ff ff > 00 00 01 00 03 00 06 00 05 00 0b 00 11 00 13 00 11 00 13 00 > 14 00 14 00 18 00 18 00 1c 00 1e 00 1e 00 22 00 20 00 21 00 > 27 00 25 00 25 00 2b 00 2c 00 2d 00 2d 00 2f 00 34 00 32 00 > 30 00 34 00 38 00 35 00 37 00 3a 00 39 00 38 00 3b 00 3c 00 > 37 00 3e 00 3e 00 3f 00 42 00 3f 00 41 00 3f 00 45 00 49 00 > 46 00 48 00 46 00 46 00 49 00 4c 00 4d 00 4b 00 4d 00 4b 00 > 4d 00 4e 00 4b 00 4d 00 4b 00 4f 00 53 00 4f 00 4b 00 4b 00 > 51 00 51 00 50 00 53 00 51 00 55 00 54 00 52 00 56 00 53 00 > 55 00 57 00 52 00 55 00 55 00 55 00 53 00 52 00 55 00 54 00 > 57 00 56 00 53 00 56 00 55 00 57 00 55 00 54 00 55 00 56 00 > 56 00 54 00 55 00 52 00 54 00 54 00 52 00 53 00 53 00 53 00 > 53 00 53 00 52 00 52 00 52 00 51 00 51 00 4f 00 4d 00 50 00 > 4f 00 4e 00 4f 00 51 00 50 00 4f 00 50 00 4d 00 4c 00 4e 00 > 4c 00 4c 00 4d 00 47 00 48 00 4c 00 49 00 4b 00 46 00 46 00 > 49 00 42 00 45 00 48 00 46 00 44 00 46 00 45 00 42 00 45 00 > 43 00 3e 00 3f 00 40 00 3d 00 3d 00 3d 00 3b 00 3e 00 40 00 > 39 00 3a 00 3b 00 35 00 36 00 36 00 36 00 33 00 35 00 37 00 > 34 00 30 00 2e 00 33 00 2e 00 2f 00 30 00 2d 00 2e 00 29 00 > 2b 00 2a 00 > PCM PLAYBACK TRIGGER STOP! > --- PERIOD ELAPSED 0 1676736 96 -- > snd_au600_prepare > PCM PLAYBACK TRIGGER START! > playback hwptr: 0 transfer_done: 1676928 192 psize: 96 stride: 2 > hwptr too big: 192 - 192 > memcpy3 384 - 0-- > 29 00 2a 00 29 00 28 00 27 00 25 00 22 00 26 00 24 00 21 00 > 21 00 1d 00 1d 00 1d 00 1e 00 1e 00 1d 00 1c 00 1a 00 1d 00 > 1c 00 18 00 19 00 13 00 15 00 16 00 10 00 13 00 13 00 11 00 > 10 00 0f 00 0c 00 0c 00 0b 00 09 00 0a 00 0b 00 0b 00 08 00 > 07 00 09 00 07 00 04 00 02 00 01 00 00 00 fe ff fb ff fb ff > fd ff fc ff fb ff f8 ff f8 ff fa ff f5 ff f3 ff f3 ff f4 ff > f4 ff f0 ff f1 ff f1 ff ee ff ee ff eb ff eb ff ec ff e7 ff > e8 ff e5 ff e3 ff e4 ff e4 ff e3 ff e1 ff e4 ff df ff dd ff > de ff da ff dc ff dc ff d9 ff d8 ff d8 ff d5 ff d3 ff d4 ff > cd ff d4 ff d3 ff cb ff d0 ff cc ff cc ff cc ff ca ff cc ff > c5 ff c6 ff c9 ff c5 ff c2 ff c1 ff c0 ff c3 ff c1 ff bf ff > bf ff bf ff be ff bc ff bb ff b9 ff b9 ff b6 ff b5 ff b7 ff > b3 ff b2 ff b2 ff af ff b0 ff b1 ff ac ff af ff ab ff a6 ff > ab ff a6 ff a7 ff a9 ff a6 ff a4 ff a1 ff a3 ff ac ff 04 01 > f3 08 02 19 6b 22 d5 19 91 06 ab f3 83 ec 13 f3 cc fe 05 06 > 2b 02 d6 f7 e6 f0 8e f5 25 05 aa 15 11 1b 62 0f 69 f8 8b e3 > df dd 4d ea 23 01 4f 14 b3 18 29 0e d1 fd db f3 cc f5 72 ff > b0 06 cb 03 c8 f7 14 ec 37 eb ba f8 18 0e 9a 1d 88 1c 6c 0a > b3 f1 5a e1 5d e2 7f f2 97 06 e3 11 f9 0e 13 03 0c f9 02 f9 > 09 02 19 0b > PCM PLAYBACK TRIGGER STOP! > --- PERIOD ELAPSED 0 1676928 96 -- > snd_au600_prepare > PCM PLAYBACK TRIGGER START! > playback hwptr: 0 transfer_done: 1677120 192 psize: 96 stride: 2 > hwptr too big: 192 - 192 > memcpy3 384 - 0-- > etc. > > Any help that could lead me further is appreciated... > > thanks, > Markus > > On 8/5/06, Markus Rechberger <mrechberger@xxxxxxxxx> wrote: > > Hi, > > > > a half year ago I bought an au600 device > > (http://alsa.opensrc.org/au600) and it's still not supported... I made > > some progress uppon the driver but there are still a few issues left. > > > > does anyone know about the snd_pcm_hardware_t struct? > > I'm not sure what values I should fill in there... > > My current driver supports a choppy kind of playback and capturing choppy > > audio. > > If I use following values in the struct my box locks up when the audio > > stream is over (uninitialized buffer for sure) > > static snd_pcm_hardware_t snd_au600_hw = { > > .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | > > SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID, > > .formats = SNDRV_PCM_FMTBIT_S16_LE, > > .rates = SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS, > > .rate_min = 9600, > > .rate_max = 9600, > > .channels_min = 1, > > .channels_max = 1, > > .buffer_bytes_max = (32*1024), > > .period_bytes_min = 64, > > .period_bytes_max = 2048, > > .periods_min = 1, > > .periods_max = 255, > > }; > > > > If I set the values lower it doesn't crash anymore but afterwards the > > stream sounds garbled. > > > > The streamformat itself is PCM, 9600hz, 16Bit, mono, S16_LE (capturing > > as well as playback) > > > > Markus > > > ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
