On 03/13/15 13:56, Lars-Peter Clausen wrote:
On 03/13/2015 12:36 PM, Jyri Sarha wrote: [...]
In theory this patch does exactly what it is supposed to. It only allows a sample-rate and sample-format combination if the rate can be produced with reasonable accuracy. Unfortunately the alsa-lib and alsa-tools are not able use this information too well. If the requested sample-rate and sample-format is not available the aplay/arecord fails, even if plughw is selected, with:
pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed.
[...]
- /*
* If we rely on implicit BCLK divider setting we should* set constraints based on what we can provide.*/- if (mcasp->bclk_master && mcasp->bclk_div == 0 &&
mcasp->sysclk_freq)
return snd_pcm_hw_rule_add(substream->runtime, 0,SNDRV_PCM_HW_PARAM_RATE,davinci_mcasp_hw_rule_rate,mcasp,SNDRV_PCM_HW_PARAM_FRAME_BITS,SNDRV_PCM_HW_PARAM_CHANNELS, -1);For things to work correctly you also need reverse rules restricting CHANNELS and FRAME_BITS based on the RATE. This might fix the issue you are seeing with the ALSA tools.
Thanks, that was indeed the case. I mail a new patch once I get my patch in order.
Best regards, Jyri