[PATCH] Wrap hw_ptr to boundary in pcm_ioplug

[PATCH] Wrap hw_ptr to boundary in pcm_ioplug

[MONTANARO Luciano (MM)]

The function snd_pcm_ioplug_hw_ptr_update() always increased the hw_ptr
by delta, without wrapping it to the boundary. This would lead to
problems when after many hours, the hw_ptr would overflow.
---
 src/pcm/pcm_ioplug.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c
index a90c844..c1c3a98 100644
--- a/src/pcm/pcm_ioplug.c
+++ b/src/pcm/pcm_ioplug.c
@@ -60,7 +60,7 @@ static void snd_pcm_ioplug_hw_ptr_update(snd_pcm_t *pcm)
                        delta = hw - io->last_hw;
                else
                        delta = pcm->buffer_size + hw - io->last_hw;
-               io->data->hw_ptr += delta;
+               snd_pcm_mmap_hw_forward(io->data->pcm, delta);
                io->last_hw = hw;
        } else
                io->data->state = SNDRV_PCM_STATE_XRUN;
--
1.7.0.4






--
Luciano Montanaro
EntryNAV - Audio Software Integrator
Magneti Marelli Electronic Systems
Viale Carlo Emanuele II 150, Venaria Reale (To)
Tel. (+39) 011 6879765





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Re: [PATCH] Wrap hw_ptr to boundary in pcm_ioplug

[Jaroslav Kysela]

Date 4.3.2014 12:51, MONTANARO Luciano (MM) wrote:
> The function snd_pcm_ioplug_hw_ptr_update() always increased the hw_ptr
> by delta, without wrapping it to the boundary. This would lead to
> problems when after many hours, the hw_ptr would overflow.

Applied to our GIT tree. Thanks.

					Jaroslav

-- 
Jaroslav Kysela <perex@perex.cz>
Linux Kernel Sound Maintainer
ALSA Project; Red Hat, Inc.