zynaddsubfx

commit 12aefb3e0cc6e1de0df0a33fa034383802e28fc4
parent 69db6ee56ba840d0c9c2aad9950f51c2518ecb32
Author: Harald Hvaal <harald.hvaal@gmail.com>
Date:   Sun, 14 Mar 2010 22:08:09 +0100

Nio: Adding periods to alsa engine init, fixes latency issues

Diffstat:
M
src/Nio/AlsaEngine.cpp
 | 
6
+++++-
M
src/Nio/AlsaEngine.h
 | 
1
+

2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/Nio/AlsaEngine.cpp b/src/Nio/AlsaEngine.cpp
@@ -287,10 +287,14 @@ bool AlsaEngine::openAudio()
     snd_pcm_hw_params_set_rate_near(audio.handle, audio.params,
             &audio.sampleRate, NULL);
 
-    audio.frames = 32;
+    audio.frames = 512;
     snd_pcm_hw_params_set_period_size_near(audio.handle,
             audio.params, &audio.frames, NULL);
 
+    audio.periods = 4;
+    snd_pcm_hw_params_set_periods_near(audio.handle,
+            audio.params, &audio.periods, NULL);
+
     /* Write the parameters to the driver */
     rc = snd_pcm_hw_params(audio.handle, audio.params);
     if (rc < 0) {
diff --git a/src/Nio/AlsaEngine.h b/src/Nio/AlsaEngine.h
@@ -71,6 +71,7 @@ class AlsaEngine : public AudioOut, MidiIn
             snd_pcm_hw_params_t *params;
             unsigned int sampleRate;
             snd_pcm_uframes_t frames;
+            unsigned int periods;
             const short *buffer;
             pthread_t    pThread;
         } audio;