From 727fb305a82ffada6cb69f3f7cc38407e3256279 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?kleines=20Filmr=C3=B6llchen?= <filmroellchen@serenityos.org>
Date: Thu, 17 Nov 2022 20:29:38 +0100
Subject: [PATCH] LibAudio: Allow resampling into existing buffer

This alleviates some copying
and we can implement existing APIs in terms of this.
---
 Userland/Libraries/LibAudio/Resampler.h | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/Userland/Libraries/LibAudio/Resampler.h b/Userland/Libraries/LibAudio/Resampler.h
index 9c4d04db91..86799d9197 100644
--- a/Userland/Libraries/LibAudio/Resampler.h
+++ b/Userland/Libraries/LibAudio/Resampler.h
@@ -55,15 +55,21 @@ public:
     ErrorOr<Vector<SampleType>> try_resample(Samples&& to_resample)
     {
         Vector<SampleType> resampled;
-        TRY(resampled.try_ensure_capacity(to_resample.size() * ceil_div(m_source, m_target)));
+        TRY(try_resample_into_end(resampled, forward<Samples>(to_resample)));
+        return resampled;
+    }
+
+    template<ArrayLike<SampleType> Samples, size_t vector_inline_capacity = 0>
+    ErrorOr<void> try_resample_into_end(Vector<SampleType, vector_inline_capacity>& destination, Samples&& to_resample)
+    {
+        TRY(destination.try_ensure_capacity(destination.size() + to_resample.size() * ceil_div(m_source, m_target)));
         for (auto sample : to_resample) {
             process_sample(sample, sample);
 
             while (read_sample(sample, sample))
-                resampled.unchecked_append(sample);
+                destination.unchecked_append(sample);
         }
-
-        return resampled;
+        return {};
     }
 
     template<ArrayLike<SampleType> Samples>