From 626be18da0bd3774164ef85d21268e89fd7aa682 Mon Sep 17 00:00:00 2001
From: William Wilgus <wilgus.william@gmail.com>
Date: Tue, 13 Dec 2022 18:15:07 -0500
Subject: [Bug Fix] haas surround use delay_ms instead of index
 surround_strength

this appears to be an old bug

rather than using an index use delay_ms directly

Change-Id: Ia4d0bf8eb8030d6ded08354abc31cc7ddefdda99
---
 lib/rbcodec/dsp/surround.c | 55 +++++++++++++++++++---------------------------
 lib/rbcodec/dsp/surround.h |  2 +-
 2 files changed, 24 insertions(+), 33 deletions(-)

diff --git a/lib/rbcodec/dsp/surround.c b/lib/rbcodec/dsp/surround.c
index 986d81ae6f..9a1f7be8b6 100644
--- a/lib/rbcodec/dsp/surround.c
+++ b/lib/rbcodec/dsp/surround.c
@@ -30,13 +30,16 @@
 static int surround_balance = 0;
 static bool surround_side_only = false;
 static int surround_mix = 100;
-static int surround_strength = 0;
+static int surround_delay_ms = 0;
 /*1 sample ~ 11ns */
-#define DLY_5MS  454
-#define DLY_8MS  727
-#define DLY_10MS 909
-#define DLY_15MS 1363
-#define DLY_30MS 2727
+#define DLY_1US  90900
+#define DLY_5MS  ((DLY_1US * 5)/1000) /*(454)*/
+/* No longer needed but kept for reference */
+/*#define DLY_8MS  727*/
+/*#define DLY_10MS 909*/
+/*#define DLY_15MS 1363*/
+#define DLY_30MS ((DLY_1US * 30)/1000) /*(2727)*/
+#define MIN_DLY DLY_5MS
 #define MAX_DLY DLY_30MS
 
 #define B0_DLY  (MAX_DLY/8 + 1)
@@ -120,48 +123,36 @@ void dsp_surround_set_cutoff(int frq_l, int frq_h)
     surround_update_filter(dsp_get_output_frequency(dsp));
 }
 
-static void surround_set_stepsize(int surround_strength)
+static void surround_set_delay(int surround_delay_ms)
 {
     if (handle >= 0)
         dsp_surround_flush();
 
-    switch(surround_strength)
-    {
-    case 1:
-        dly_size =  DLY_5MS;
-        break;
-    case 2:
-        dly_size =  DLY_8MS;
-        break;
-    case 3:
-        dly_size =  DLY_10MS;
-        break;
-    case 4:
-        dly_size =  DLY_15MS;
-        break;
-    case 5:
-        dly_size =  DLY_30MS;
-        break;
-    }
+    dly_size =  ((DLY_1US * surround_delay_ms) /1000);
+
+    if (dly_size < MIN_DLY)
+        dly_size = MIN_DLY;
+    else if (dly_size > MAX_DLY)
+        dly_size = MAX_DLY;
 }
 
-void dsp_surround_enable(int var)
+void dsp_surround_enable(int delay_ms)
 {
-    if (var == surround_strength)
+    if (delay_ms == surround_delay_ms)
         return; /* No setting change */
 
-    surround_strength = var;
+    surround_delay_ms = delay_ms;
 
     struct dsp_config *dsp = dsp_get_config(CODEC_IDX_AUDIO);
     bool was_enabled = dsp_proc_enabled(dsp, DSP_PROC_SURROUND);
-    bool now_enabled = var > 0;
+    bool now_enabled = delay_ms > 0;
+
+    if (now_enabled)
+        surround_set_delay(delay_ms);
 
     if (was_enabled == now_enabled)
         return; /* No change in enabled status */
 
-    if (now_enabled)
-        surround_set_stepsize(var);
-
     /* If changing status, enable or disable it; if already enabled push
        additional DSP_PROC_INIT messages with value = 1 to force-update the
        filters */
diff --git a/lib/rbcodec/dsp/surround.h b/lib/rbcodec/dsp/surround.h
index 1683367865..7835f569b6 100644
--- a/lib/rbcodec/dsp/surround.h
+++ b/lib/rbcodec/dsp/surround.h
@@ -23,7 +23,7 @@
 
 #include <stdbool.h>
 void dsp_surround_enable(int var);
-void dsp_surround_set_balance(int var);
+void dsp_surround_set_balance(int delay_ms);
 void dsp_surround_set_cutoff(int frq_l, int frq_h);
 void dsp_surround_side_only(bool var);
 void dsp_surround_mix(int var);
-- 
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