[mythtv] [mythtv-commits] Ticket #4764: alsa buffer problem introducedin 15893

[Mark Spieth]

> tested t4764.diff, but I will as soon as possible. Though 128000
> (=32000*4) is still quite close to 100000 (which was too small).
>
> Digital spdif out doesn't work for me until i changed:
>
> buffer_time = 32000 * 4;    // in usec
>
> to
>
> buffer_time = 32000 * 16;    // in usec
>
> Even a setting of 8 was to small.

ok looks like spdif needs above 400ms.
does the following work for everyone?

        period_time = (audio_passthru)?125:32;   // fragment period in ms, 
for transparency
        fragment_size = (audio_bits * audio_channels * audio_samplerate * 
period_time) / 8000;
        period_time *= 1000;  // convert to usec, fragment time for 4 
interrupts per buffer
        buffer_time = period_time * 4;    // in usec

it would be nice if there werent so many variations in alsa drivers.

mark