diff options
| -rw-r--r-- | sound/core/pcm_lib.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index bc57501..e9debaa 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -374,9 +374,23 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, (unsigned long)runtime->hw_ptr_base); } - /* without period interrupts, there are no regular pointer updates */ - if (runtime->no_period_wakeup) + if (runtime->no_period_wakeup) { + /* + * Without regular period interrupts, we have to check + * the elapsed time to detect xruns. + */ + jdelta = jiffies - runtime->hw_ptr_jiffies; + hdelta = jdelta - delta * HZ / runtime->rate; + while (hdelta > runtime->hw_ptr_buffer_jiffies / 2 + 1) { + delta += runtime->buffer_size; + hw_base += runtime->buffer_size; + if (hw_base >= runtime->boundary) + hw_base = 0; + new_hw_ptr = hw_base + pos; + hdelta -= runtime->hw_ptr_buffer_jiffies; + } goto no_delta_check; + } /* something must be really wrong */ if (delta >= runtime->buffer_size + runtime->period_size) { |