From: Jaroslav Kysela perex@perex.cz
The snd_pcm_playback_hw_avail() function uses runtime->status->hw_ptr. Unfortunately, in case when we call this function from snd_pcm_update_hw_ptr0(), this variable contains the previous hardware pointer. Use the new_hw_ptr argument to calculate hw_avail (filled samples by the user space) to correct the threshold comparison.
The new_hw_ptr argument may also be set to ULONG_MAX which means the initialization phase. In this case, use runtime->status->hw_ptr.
Suggested-by: Oswald Buddenhagen oswald.buddenhagen@gmx.de Signed-off-by: Jaroslav Kysela perex@perex.cz Reviewed-by: Oswald Buddenhagen oswald.buddenhagen@gmx.de --- sound/core/pcm_lib.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 3357ffae635f..6ad67e7e740c 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -63,7 +63,15 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram } if (runtime->silence_filled >= runtime->buffer_size) return; - noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; + /* initialization outside pointer updates */ + if (new_hw_ptr == ULONG_MAX) + new_hw_ptr = runtime->status->hw_ptr; + /* get hw_avail with the boundary crossing */ + noise_dist = appl_ptr - new_hw_ptr; + if (noise_dist < 0) + noise_dist += runtime->boundary; + /* total noise distance */ + noise_dist += runtime->silence_filled; if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) return; frames = runtime->silence_threshold - noise_dist;