Quoting Clemens Ladisch <cladisch@xxxxxxxxxxxxxx>:
> Mark Bishop wrote:
>> I can use a utility called 'tone' that is part of my BSP and it opens
>> /dev/dsp and plays a sin wave through a SPORT port on my blackfin. I
>> can then see this data get through the SSM2603 codec and out to a
>> speaker. And, when I read the codec registers while the tone is
>> playing I see that it is in I2S 16 bit mode.
>>
>> When I use 'aplay test.wav' I get no data across the SPORT port and I
>> notice that the codec registers are now set to 32 bit I2S mode. I'm
>> not sure if this even matters but it is the only difference in
>> hardware settings when I use 'aplay' vs 'tone.'
>
> Is the .wav file 32 bits, or did aplay decide to convert to 32 bits
> (use -v to check), or is there a bug in your driver?
>
>
> Regards,
> Clemens
>
>
So I did a bit more debugging (and I am a complete ALSA newb)
root:/> aplay -v test.wav
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Plug PCM: Rate conversion PCM (48000, sformat=S32_LE)
Converter: linear-interpolation
Protocol version: 10002
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 15052
period_size : 940
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 940
period_event : 0
start_threshold : 15052
stop_threshold : 15052
silence_threshold: 0
silence_size : 0
boundary : 986447872
Slave: Direct Stream Mixing PCM
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 32
buffer_size : 16384
period_size : 1024
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
Hardware PCM card 0 'bfin-ssm2602' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 32
buffer_size : 16384
period_size : 1024
period_time : 21333
tstamp_mode : ENABLE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 1
stop_threshold : 1073741824
silence_threshold: 0
silence_size : 1073741824
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
then I made an /etc/asound.conf
pcm_slave.sl2{
pcm "hw:0,0"
rate 48000
}
pcm.rate_convert {
type rate
slave sl2
}
And then played it with:
root:~> aplay -D rate_convert test.wav
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