2010/9/9 IOhannes m zmoelnig <zmoelnig@xxxxxx> > On 2010-09-09 03:30, Raymond Yau wrote: > > > > http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___h_w___params.htm > l > > > what is the minimum rate returned by snd_pcm_hw_params_get_rate_min() > when > > using hw:0,0 ? > > for hw:0,0 it is 48000, direction=0 > for plughw:0,0 i get 4000(sic!), direction=0 > Are there any reason which you need to use snd_pcm_hw_params_set_rate_min() instead of snd_pcm_hw_params_set_rate_near() ? set_rate_min( 44100) only restrict a configuration space with a minimum rate and this is not sufficient for alsa-lib to refine the parameters of snd_pcm_hw_params() to unique value when the device is plughw and your sound card only support 48000Hz and 96000Hz Yes, I can reprodued the assertion with a patched intel8x0 driver inside virtualbox since there is no error when using the emulated ac97 controller and codec which support 8000Hz<->48000Hz There is no error when change to use set_rate_near instead of set_rate_min > > > > > To debug , you will need to enable RULES_DEBUG In pcm_params.c > > > > add snd_pcm_dump() after snd_pcm_hw_params in your program > > > > export LIBASOUND_DEBUG=1 > > > > and post the output of your program > > ok, i tried that. > there's of course the little problem with havind snd_pcm_dump() after > snd_pcm_hw_params(), since the latter crashes... > so i added it before i start configuring the device as well. here's the > pseudocode: > <snip> > open(PLAYBACK); > dump(); > nonblock(1); get_rate(); set_rate(44100); set_period(64); > dump(); > close(); > open(CAPTURE); > dump(); > nonblock(1); get_rate(); set_rate(44100); set_period(64); /* CRASH */ > dump(); > close(); > </snip> > > i prefixed all the printout of my application with "JMZ", so you can > easily filter it out. > > fgmasdr > IOhannes > > > schange 'plughw:0,0' (slave) ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: [32 128] CHANNELS: [2 8] RATE: [48000 96000] PERIOD_TIME: (20 341334) PERIOD_SIZE: [2 16384] PERIOD_BYTES: [32 131072] PERIODS: [1 1024] BUFFER_TIME: (20 341334) BUFFER_SIZE: [2 16384] BUFFER_BYTES: [32 65536] TICK_TIME: ALL ALSA ERROR hw_params: set (RATE) value = 44100 : Invalid argument ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: [32 128] CHANNELS: [2 8] RATE: [48000 96000] PERIOD_TIME: (20 341334) PERIOD_SIZE: [2 16384] PERIOD_BYTES: [32 131072] PERIODS: [1 1024] BUFFER_TIME: (20 341334) BUFFER_SIZE: [2 16384] BUFFER_BYTES: [32 65536] TICK_TIME: ALL ALSA ERROR hw_params: set (RATE) value = 88200 : Invalid argument ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: [32 128] CHANNELS: [2 8] RATE: [48000 96000] PERIOD_TIME: (20 341334) PERIOD_SIZE: [2 16384] PERIOD_BYTES: [32 131072] PERIODS: [1 1024] BUFFER_TIME: (20 341334) BUFFER_SIZE: [2 16384] BUFFER_BYTES: [32 65536] TICK_TIME: ALL srefine 'plughw:0,0' (client) ACCESS: MMAP_INTERLEAVED FORMAT: S8 SUBFORMAT: STD SAMPLE_BITS: 8 FRAME_BITS: 8 CHANNELS: 1 RATE: [44100 44100] PERIOD_TIME: (83 1452) PERIOD_SIZE: 64 PERIOD_BYTES: 64 PERIODS: (0 4113) BUFFER_TIME: (3 5968186) BUFFER_SIZE: [3 263197] BUFFER_BYTES: [3 263197] TICK_TIME: ALL srefine 'plughw:0,0' (slave) ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 48000 PERIOD_TIME: (166 1452) PERIOD_SIZE: [8 16384] PERIOD_BYTES: [32 65536] PERIODS: [1 1024] BUFFER_TIME: (166 341334) BUFFER_SIZE: [8 16384] BUFFER_BYTES: [32 65536] TICK_TIME: ALL cchange 'plughw:0,0' The assertion occur becacuse RATE=44100 -> NONE Rule 5 (0xb7773aa0): FRAME_BITS=8 -> 8 BUFFER_BYTES=[3 263197] BUFFER_SIZE=[7 15052] Rule 7 (0xb7773aa0): RATE=44100 -> NONE PERIOD_SIZE=64 PERIOD_TIME=(166 1438) alsatest: interval_inline.h:52: snd_interval_single: Assertion `!snd_interval_empty(i)' failed. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
