[pulseaudio-discuss] Can't get Pulseadio to playback stream on Raspbian with HifiBerry DAC+

[Raymond Yau]

This is my alsa-info.sh

Your ALSA information is located at
http://www.alsa-project.org/db/?f=b0fa712883998f34f799364e4240cc8c708eba5d

Does this help?


 This is my alsa-info.sh


Your ALSA information is located at
http://www.alsa-project.org/db/?f=b0fa712883998f34f799364e4240cc8c708eba5d


Does this help?

do you have the source code of the audio driver ???



diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c
index bb79e71..e36c2a7 100644
--- a/src/modules/alsa/alsa-util.c
+++ b/src/modules/alsa/alsa-util.c
@@ -481,7 +481,7 @@ int pa_alsa_set_sw_params(snd_pcm_t *pcm,
snd_pcm_uframes_t avail_min, bool peri
         return err;
     }

-    if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams,
(snd_pcm_uframes_t) -1)) < 0) {
+    if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams,
boundary)) < 0) {
         pa_log_warn("Unable to set start threshold: %s\n",
pa_alsa_strerror(err));
         return err;
     }

>
> > Okay, on someone's recommendation, I removed the existing version of
> pulseaudio (2, I think) and compiled a fresh one (5.99.3). Pulse seems to
> attempt to use the hifiberry, but I still get the following error:
> >
> > I: [alsa-sink-HiFiBerry DAC+ HiFi pcm512x-hifi-0] alsa-sink.c: Starting
> playback.
> > I: [alsa-sink-HiFiBerry DAC+ HiFi pcm512x-hifi-0] (alsa-lib)pcm_hw.c:
> SNDRV_PCM_IOCTL_START failed (-77)
> >
> > What exactly does this mean? Sorry for the newbie questions.
> >
>
> You have to post output of alsa-info.sh
>
> The error occur when pcm state is running when pulseaudio call
> snd_pcm_start()
>
> Do you know where to find the source code of your audio driver, seem not
> in
> https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound
>
> > D: [pulseaudio] alsa-util.c:   start_threshold  : -1
>
> It is because pulseaudio set start_threshold to -1 , this mean first
> snd_pcm_write() automatically trigger playback to start since
>
> frames written > start_threshold
>
>
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