On Mon, 23 Feb 2009 13:35:14 +0100 Alexandre Ratchov <a...@caoua.org> wrote:
> aucat records 1-channel, s16le at 16kHz (required by the device) > then it converts it to 2-channel, s16le at 44.1kHz (required by -o > defaults) and saves the result. So it appears to work. > > You probably want to record as follows: > > aucat -f /dev/audio1 -C 0:0 -e s16le -r 16000 -o out-wcam-plain.raw > > and then to play it: > > aucat -c 0:0 -e s16le -r 16000 -i out-wcam-plain.raw > > Let me know if above commands properly work on current (they should > work even on few months old -current system, but iirc not on 4.4) > The above failed on both 4.5-current (Feb 18), and 4.4-Stable. Though there have been a ton of changes since 4.4-stable, the old code works perfectly with this device. From the output below, you can see the 4.4-stable code up-sampling from 16000Hz to 44100Hz. $ aucat -C 0:0 -e s16le -r 16000 -f /dev/audio1 -o test44.raw test44.raw: assuming headerless file /dev/audio1: recording s16le,0:0,16000Hz /dev/audio1: using 4004ms rec buffer file_new: /dev/audio1 file_new: test44.raw test44.raw: s16le,0:0,16000Hz -> s16le,0:0,44100Hz test44.raw: writing s16le,0:0,44100Hz starting device... dev_start: play/rec started ^Cdraining buffers... sub_rm: copy aproc_del: wpipe: test44.raw: deleted abuf_del: aproc_del: conv: test44.raw: deleted abuf_del: aproc_del: sub: copy: deleted abuf_del: aproc_del: rpipe: /dev/audio1: deleted file_poll: test44.raw: deleted file_poll: /dev/audio1: deleted test44.raw: closed dev_stop: play/rec stopped $ $ aucat -c 0:0 -e s16le -i test44.raw test44.raw: assuming headerless file /dev/audio: playing s16le,0:0,44100Hz /dev/audio: using 700ms play buffer file_new: /dev/audio file_new: test44.raw test44.raw: reading s16le,0:0,44100Hz filling buffers... starting device... dev_start: play/rec started aproc_del: rpipe: test44.raw: deleted file_poll: test44.raw: deleted mix_rm: softmix abuf_del: mix_out: nothing more to do... aproc_del: mix: softmix: deleted abuf_del: aproc_del: wpipe: /dev/audio: deleted file_poll: /dev/audio: deleted draining buffers... file_poll: nothing to do... dev_stop: play/rec stopped $ Unfortunately, the above doesn't work in 4.5-current, and the debug output has been changed somewhat. One of the things I did notice is the resampling from 16000Hz to 44100Hz does not seem to be occurring in 4.5-current. $ aucat -C 0:0 -e s16le -r 16000 -f /dev/audio1 -o test45.raw test45.raw: assuming headerless file safile_new: using 5872(2936) fpb file_new: sndio:hdl dev_init: hw recording s16le,0:0,16000Hz dev_init: using 8808 fpb safile_start: play/rec started file_new: wav:test45.raw ^Cdev_done: dev_mix = 0x0, dev_sub = 0x7c9ae880 safile_stop: play/rec stopped aproc_del: rpipe(hdl): terminating... file_del: sndio:hdl <>: delayed sub_hup: sub: eof aproc_del: sub(sub): terminating... aproc_del: wpipe(test45.raw): terminating... file_del: wav:test45.raw <WOK>: immediate aproc_del: wpipe(test45.raw): freed aproc_del: sub(sub): freed aproc_del: rpipe(hdl): has refs file_del: sndio:hdl <>: immediate aproc_del: rpipe(hdl): terminating... aproc_del: rpipe(hdl): freed $ aucat -c 0:0 -e s16le -i test45.raw test45.raw: assuming headerless file safile_new: using 5888(2944) fpb file_new: sndio:hdl dev_init: hw playing s16le,0:0,44100Hz mix_newout: using 2944 fpb dev_init: using 8832 fpb safile_start: play/rec started file_new: wav:test45.raw mix_setmaster: 0x81324000: 32768/32768 -> 32768 dev_setvol: 0x81324000 dev_setvol: 0x81324000 -> 32768 aproc_del: rpipe(test45.raw): terminating... file_del: wav:test45.raw <>: delayed aproc_del: rpipe(test45.raw): freed file_del: wav:test45.raw <>: immediate mix_eof: mix: detached dev_done: dev_mix = 0x89201580, dev_sub = 0x0 mix_out: nothing more to do... aproc_del: mix(mix): terminating... aproc_del: mix(mix): freed aproc_del: wpipe(hdl): terminating... file_del: sndio:hdl <WOK>: delayed aproc_del: wpipe(hdl): has refs file_del: sndio:hdl <WOK>: immediate aproc_del: wpipe(hdl): terminating... aproc_del: wpipe(hdl): freed $ You may also want to note that by defining the rate (-r) as 16000Hz in the playback still results in it playing too fast and with distortion, albeit slower than playing it as above at 44100Hz. From the debug output on the recording, it seems the file is supposed to be saved at 16000Hz, but on playback, you have the force the rate down to about 8000Hz for the timing to seem correct (i.e. normal speech speed, but there is also plenty of distortion). I still think the issue has something to do with the new resampling (rate change) code that allows aucat in server mode (-l) to handle anything you toss at it. If I'm reading the debug output correctly, the old 4.4-stable aucat resampled from 16000Hz up to 44100Hz, but the 4.5-current aucat is not resampling the input at all during recording? -- J.C. Roberts
