Takashi Iwai wrote: > Does your driver support mmap? > It looks like the hardware doesn't accept the default parameters: patrakov@home:~$ arecord -M -f S16_LE -c 2 -r 32000 -D hw:1 /dev/null Recording WAVE '/dev/null' : Signed 16 bit Little Endian, Rate 32000 Hz, Stereo ALSA lib pcm_mmap.c:369:(snd_pcm_mmap) mmap failed: Invalid argument arecord: set_params:961: Unable to install hw params: ACCESS: MMAP_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 32000 PERIOD_TIME: 125000 PERIOD_SIZE: 4000 PERIOD_BYTES: 16000 PERIODS: 4 BUFFER_TIME: 500000 BUFFER_SIZE: 16000 BUFFER_BYTES: 64000 TICK_TIME: 4000 Even though mmap seems to be supported in the driver source (judging from .info = SNDRV_PCM_INFO_MMAP | other flags), I could not figure out the parameters that work. Moreover, the driver seems to accept the same hardware parameters without the mmap, and I could not find parameters that the driver accepts for mmap. Also: I have retested my original problem with the virtual ens1370 card emulated by qemu. The original testcase does work, so the problem seems to be specific to saa7134, due to non-working mmap access. Could you please help me transform my observations into something that the v4l development list will accept as a good bug report? One more question: since plug doesn't work at all on devices without mmap available, does this mean that I should scrap my original idea about using plug to convert everything into S24? -- Alexander E. Patrakov _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
