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Bug 3507

Summary: audio glitch after internal resampling
Product: SDL Reporter: Sylvain <sylvain.becker>
Component: audioAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: don't know   
Hardware: x86_64   
OS: Linux   
Attachments: sound

Description Sylvain 2016-12-05 12:34:29 UTC 
Created attachment 2647 [details]
sound

Since audio converter code https://hg.libsdl.org/SDL/rev/bb99dede0675
There is a glitch after playing attached wav sound file.

Some log:
Build format 8010->8010, channels 1->2, rate 48000->22050
Comment 1 Sylvain 2016-12-14 13:38:44 UTC 
Ryan, 

I think there may be an issue when downsampling (and also upsampling), 
I would apply this patch (and the same for upsampling):

--- a/src/audio/SDL_audiotypecvt.c	Tue Dec 13 00:22:42 2016 -0500
+++ b/src/audio/SDL_audiotypecvt.c	Wed Dec 14 14:37:06 2016 +0100
@@ -283,11 +283,11 @@
     SDL_memcpy(last_sample, src, cpy);
 
     while (dst < target) {
-        src += 8;
+        src += channels;
         eps += dstsize;
         if ((eps << 1) >= srcsize) {
             SDL_memcpy(dst, sample, cpy);
-            dst += 8;
+            dst += channels;
             for (i = 0; i < channels; i++) {
                 sample[i] = (float) ((((double) src[i]) + ((double) last_sample[i])) * 0.5);
             }
Comment 2 Ryan C. Gordon 2016-12-17 21:16:20 UTC 

Whoops, sorry! This is fixed now in https://hg.libsdl.org/SDL/rev/f6cd81aab88e !

--ryan.