> > When does the pointer to the next playback/capture audio period rewind? I
> > noticed that for more than 2 periods_max, this can happen anytime
> > (eg. after 2, 3, ...) even before we reached the end of the buffer.
>
> it must be after the hw_ptr reaches the end of the buffer.
> please check snd_pcm_update_hw_ptr_interrupt() in pcm_lib.c.
I am having a real hard time understanding
snd_pcm_update_hw_ptr_interrupt()
snd_pcm_lib_write_transfer()
snd_pcm_lib_write1()
and snd_pcm_lib_write()
For instance, it is not clear to me the relation between runtime->buffer_size
and runtime->boundary ?
What does runtime->hw_ptr_base ?
Should the pointer function wrap at buffer_size, like this:
pos += data_sent;
if (pos == buffer_size)
pos = 0;
Lastly, I have a card that defines the on-board maximum buffer size in samples,
not in bytes. This is the cause of some trouble because the structure
snd_pcm_hardware_t doesn't support such a thing as a buffer_size_max - do you
have any suggestion? As of now, I define buffer_bytes_max for a specific format
(ie. LE16).
Thanks,
Guilhem.
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