- struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_uframes_t pos;
- snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
- snd_pcm_sframes_t delta;
- unsigned long jdelta;
-
- old_hw_ptr = runtime->status->hw_ptr;
- pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
- if (pos == SNDRV_PCM_POS_XRUN) {
- xrun(substream);
- return -EPIPE;
- }
- hw_base = runtime->hw_ptr_base;
- new_hw_ptr = hw_base + pos;
-
- delta = new_hw_ptr - old_hw_ptr;
- jdelta = jiffies - runtime->hw_ptr_jiffies;
- if (delta < 0) {
- delta += runtime->buffer_size;
- if (delta < 0) {
- hw_ptr_error(substream,
- "Unexpected hw_pointer value [2] "
- "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
- substream->stream, (long)pos,
- (long)old_hw_ptr, jdelta);
- return 0;
- }
- hw_base += runtime->buffer_size;
- if (hw_base >= runtime->boundary)
- hw_base = 0;
- new_hw_ptr = hw_base + pos;
- }
- /* Do jiffies check only in xrun_debug mode */
- if (xrun_debug(substream, 4) &&
- ((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
- hw_ptr_error(substream,
- "hw_ptr skipping! "
- "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
- (long)pos, (long)delta,
- (long)runtime->period_size, jdelta,
- ((delta * HZ) / runtime->rate));
- return 0;
- }
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
- runtime->silence_size > 0)
- snd_pcm_playback_silence(substream, new_hw_ptr);
-
- if (runtime->status->hw_ptr != new_hw_ptr)
- return 0;
-
- runtime->hw_ptr_base = hw_base;
- runtime->status->hw_ptr = new_hw_ptr;
- runtime->hw_ptr_jiffies = jiffies;
- if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
- snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
-
- return snd_pcm_update_hw_ptr_post(substream, runtime);