I have spent most of the past couple of days trying to understand why a
program is failing to obtain data from a device.
I have stripped away the code down to this very simple (and silly) sample:
--------
cout << "avail +5s = " << snd_pcm_avail(_handle) << endl;
cout << "calling snd_pcm_readi" << endl;
char sdata [10000];
const snd_pcm_sframes_t r = snd_pcm_readi(_handle, &sdata, 10);
cout << "value returned by _readi_func = " << r << endl;
--------
The output produced is:
avail +5s = 3999
calling snd_pcm_readi
The call to snd_pcm_readi() never returns, and I have no idea why, as avail()
says that there are plenty of data waiting to be read.
For what it's worth, snd_pcm_dump() says:
--------
ACCESS: RW_INTERLEAVED
FORMAT: S16_LE
SUBFORMAT: STD
SAMPLE_BITS: 16
FRAME_BITS: 32
CHANNELS: 2
RATE: 8000
PERIOD_TIME: 125000
PERIOD_SIZE: 1000
PERIOD_BYTES: 4000
PERIODS: 4
BUFFER_TIME: 500000
BUFFER_SIZE: 4000
BUFFER_BYTES: 16000
TICK_TIME: 0
--------
This behaviour is 100% consistent, and I am at a loss as to what I might be
doing wrong.
Any insights very gratefully received. Obviously, more information is
available if needed.
Doc
--
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