[PATCH 2/2] plugio: Check for pointer callback error codes

From: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com>
To: alsa-devel@alsa-project.org
Subject: [PATCH 2/2] plugio: Check for pointer callback error codes
Date: Mon, 23 Aug 2021 13:48:38 +0200	[thread overview]
Message-ID: <CAGFh025WJ3uCfiE=2vYYd=gzwY690iokjvTD1GQ_G+e2aT4X6g@mail.gmail.com> (raw)

By checking error code returned by the pointer callback, we can
determine more precisely PCM state. Previous implementation assumed,
that a software PCM can only produce overrun or underrun. It was
impossible to mark software PCM as disconnected.

Signed-off-by: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com>
---
 src/pcm/pcm_ioplug.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c
index c96104e9..0e27e121 100644
--- a/src/pcm/pcm_ioplug.c
+++ b/src/pcm/pcm_ioplug.c
@@ -81,11 +81,21 @@ static int snd_pcm_ioplug_hw_ptr_update(snd_pcm_t *pcm)
  }
  io->last_hw = (snd_pcm_uframes_t)hw;
  } else {
+ switch (hw) {
+ case -ESTRPIPE:
+ io->data->state = SND_PCM_STATE_SUSPENDED;
+ break;
+ case -ENODEV:
+ io->data->state = SND_PCM_STATE_DISCONNECTED;
+ break;
+ default:
+ io->data->state = SND_PCM_STATE_XRUN;
+ }
  if (io->data->state == SND_PCM_STATE_DRAINING)
  snd_pcm_ioplug_drop(pcm);
  else
  io->data->state = SNDRV_PCM_STATE_XRUN;
- return -EPIPE;
+ return hw;
  }
  return 0;
 }
-- 
2.31.1
