Fix HS playback on OSX.

ra1nb0w · Jul 24, 2024 · 58b1938 · 58b1938
1 parent 1b74461
commit 58b1938
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/src/class/audio/audio_device.c b/src/class/audio/audio_device.c
@@ -2062,7 +2062,7 @@ static bool audiod_set_interface(uint8_t rhport, tusb_control_request_t const *
 
           case AUDIO_FEEDBACK_METHOD_FIFO_COUNT:
           {
-            /* Initialize the threshold level to half filled */
+            // Initialize the threshold level to half filled
             uint16_t fifo_lvl_thr;
 #if CFG_TUD_AUDIO_ENABLE_DECODING
             fifo_lvl_thr = tu_fifo_depth(&audio->rx_supp_ff[0]) / 2;
@@ -2071,11 +2071,16 @@ static bool audiod_set_interface(uint8_t rhport, tusb_control_request_t const *
 #endif
             audio->feedback.compute.fifo_count.fifo_lvl_thr = fifo_lvl_thr;
             audio->feedback.compute.fifo_count.fifo_lvl_avg = ((uint32_t)fifo_lvl_thr) << 16;
-            /* Avoid 64bit division */
+            // Avoid 64bit division
             uint32_t nominal = ((fb_param.sample_freq / 100) << 16) / (frame_div / 100);
             audio->feedback.compute.fifo_count.nom_value = nominal;
             audio->feedback.compute.fifo_count.rate_const[0] = (audio->feedback.max_value - nominal) / fifo_lvl_thr;
             audio->feedback.compute.fifo_count.rate_const[1] = (nominal - audio->feedback.min_value) / fifo_lvl_thr;
+            // On HS feedback is more sensitive since packet size can vary every MSOF, could cause instability
+            if(tud_speed_get() == TUSB_SPEED_HIGH) {
+              audio->feedback.compute.fifo_count.rate_const[0] /= 8;
+              audio->feedback.compute.fifo_count.rate_const[1] /= 8;
+            }
           }
           break;