From befc89206827e663d7014630316fe7202bdaa2d4 Mon Sep 17 00:00:00 2001
From: vk7js <58905135+vk7js@users.noreply.github.com>
Date: Tue, 5 Jul 2022 10:16:36 +1000
Subject: [PATCH] When reading codec2 data, pad out to a multiple of 8 bytes
 with 0s so that when frames are pushed from the buffer, we don't get garbage
 at the ends of prompts which are not an exact multiple of 8 bytes.

---
 openrtx/src/core/voicePrompts.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/openrtx/src/core/voicePrompts.c b/openrtx/src/core/voicePrompts.c
index 4826b169..133f5ecc 100644
--- a/openrtx/src/core/voicePrompts.c
+++ b/openrtx/src/core/voicePrompts.c
@@ -154,6 +154,13 @@ static void GetCodec2Data(int offset, int length)
     
     fseek(voice_prompt_file, vpDataOffset+offset, SEEK_SET);
     fread((void*)&Codec2Data, length, 1, voice_prompt_file);
+    // zero buffer from length to the next multiple of 8 to avoid garbage 
+    // being played back, since codec2 frames are pushed in lots of 8 bytes.
+    if ((length % 8) != 0)
+	{
+        int bytesToZero = length % 8;
+        memset(Codec2Data+length, 0, bytesToZero);
+    }
 }
 
 void vpTerminate(void)