[pulseaudio-tickets] [Bug 49608] periodic audio skips with Intel HDA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49608

--- Comment #51 from Raymond <superquad.vortex2 at gmail.com> ---
https://www.google.com/patents/US20100131783

FIG. 2 illustrates an exemplary FIFO which has a FIFO size of 192 bytes, and a
threshold value of 128 bytes.

 Taking 48 kHz sample rate, 2 channels each having 16 bits (or 2 bytes) for
example, each frame thus contains 4 bytes of data, wherein each frame is
regarded as a “data unit of transportation.” Whenever the amount of stream data
in the FIFO is less than 128 bytes (i.e., the threshold), the HDAC 15 will
issue a bus mater cycle. As each frame is transported in an interval time of
20.83 micro second (μs) (=1/(48×103)), which is regarded as a “time unit of
transportation,” the 128 bytes therefore can keep 32 frames (=128/4) of data
for about 666 micro second (=32×20.83) without under run.


you need to use 32bits or more channels, higher rate to get 0.5ms latency

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