[alsa-devel] Master Plan on rewinding

[Alexander E. Patrakov]

21.09.2014 15:53, Clemens Ladisch wrote:
> Raymond Yau wrote:
>> Does snd-oxygen provide this position with granularity which is less than
>> the minimum period size ?
>
> Yes.  Its DMA controller uses a burst size of 32 bytes.  The pointer registers
> are documented as reporting the position with 4-byte accuracy, but there were
> problems when the period/buffer sizes were not aligned to 32 bytes.  I've set
> the minimum period size to 64 bytes, just to be safe.

Well, my friend has tested the card anyway, and I am afraid that the 
situation is in fact more complex than documented. Look how fast (8 
samples per ioctl in a busy loop!) the card eats the first 256 samples. 
This is very suspicious, and I am not really sure whether we can 
actually perform a rewind over these 256 samples.

The "usual" step of the pointer updates (via snd_pcm_avail) is indeed 8 
samples = 32 bytes with some fine-grained updates sometimes showing up 
in the middle, which matches the documented burst size.

-- 
Alexander E. Patrakov
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min_period_size: 16 frames, dir: 0
Playback hwparams: FIFO size is 0
Hardware PCM card 0 'Xonar DX' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 1024
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
Playing silence
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