From 074e4115dd034317bc084574b0c01c2bc4025c67 Mon Sep 17 00:00:00 2001
From: Christopher Snowhill <kode54@gmail.com>
Date: Tue, 1 Feb 2022 22:47:11 -0800
Subject: [PATCH] sox resampler: Perform post file flush

Flush the resampler when the source file terminates, so that it outputs
delayed samples properly. This fixes gapless decoding of resampled
files.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
---
 Audio/Chain/ConverterNode.m | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Audio/Chain/ConverterNode.m b/Audio/Chain/ConverterNode.m
index 4198d44e5..3dc65017e 100644
--- a/Audio/Chain/ConverterNode.m
+++ b/Audio/Chain/ConverterNode.m
@@ -954,7 +954,22 @@ tryagain:
         
         if (!skipResampler)
         {
+            ioNumberPackets += soxr_delay(soxr);
+            
             soxr_process(soxr, (float *)(((uint8_t*)inputBuffer) + inpOffset), inputSamples, &inputDone, floatBuffer, ioNumberPackets, &outputDone);
+            
+            if (latencyEatenPost)
+            {
+                // Post file flush
+                size_t idone = 0, odone = 0;
+                
+                do
+                {
+                    soxr_process(soxr, NULL, 0, &idone, floatBuffer + outputDone * floatFormat.mBytesPerPacket, ioNumberPackets - outputDone, &odone);
+                    outputDone += odone;
+                }
+                while (odone > 0);
+            }
         }
         else
         {