From 16a790a33d8cf233bc294063b03cb029bfc22162 Mon Sep 17 00:00:00 2001
From: Paul Fd <paul@ferrand.cc>
Date: Thu, 15 Apr 2021 10:57:36 +0200
Subject: [PATCH] Small, all zero files are replaced by *silence

---
 src/sfizz/FilePool.cpp           |   1 -
 src/sfizz/Synth.cpp              |  20 ++++++++++++++++++--
 tests/SynthT.cpp                 |  17 +++++++++++++++++
 tests/TestFiles/root_key_38.flac | Bin 8436 -> 12935 bytes
 tests/TestFiles/root_key_38.wav  | Bin 90 -> 4572 bytes
 tests/TestFiles/root_key_62.flac | Bin 8436 -> 12935 bytes
 tests/TestFiles/root_key_62.wav  | Bin 90 -> 4572 bytes
 tests/TestFiles/silence.wav      | Bin 0 -> 4044 bytes
 8 files changed, 35 insertions(+), 3 deletions(-)
 create mode 100644 tests/TestFiles/silence.wav

diff --git a/src/sfizz/FilePool.cpp b/src/sfizz/FilePool.cpp
index 78783a0ca..6bd4e35ae 100644
--- a/src/sfizz/FilePool.cpp
+++ b/src/sfizz/FilePool.cpp
@@ -355,7 +355,6 @@ sfz::FileDataHolder sfz::FilePool::loadFile(const FileId& fileId) noexcept
             *fileInformation
         });
         insertedPair.first->second.status = FileData::Status::Preloaded;
-        ASSERT(insertedPair.second);
         return { &insertedPair.first->second };
     }
 }
diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 2d7f2a92a..fc4ad988b 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -595,8 +595,24 @@ void Synth::Impl::finalizeSfzLoad()
                 continue;
             }
 
-            region.hasWavetableSample = fileInformation->wavetable ||
-                fileInformation->end < config::wavetableMaxFrames;
+            region.hasWavetableSample = fileInformation->wavetable.has_value();
+
+            if (fileInformation->end < config::wavetableMaxFrames) {
+                auto sample = resources_.filePool.loadFile(*region.sampleId);
+                bool allZeros = true;
+                int numChannels = sample->information.numChannels;
+                for (int i = 0; i < numChannels; ++i) {
+                    allZeros &= allWithin(sample->preloadedData.getConstSpan(i),
+                        -config::virtuallyZero, config::virtuallyZero);
+                }
+
+                if (allZeros) {
+                    region.sampleId.reset(new FileId("*silence"));
+                    region.hasWavetableSample = false;
+                } else {
+                    region.hasWavetableSample |= true;
+                }
+            }
         }
 
         if (!region.isOscillator()) {
diff --git a/tests/SynthT.cpp b/tests/SynthT.cpp
index abc9054a4..d9f6a2daa 100644
--- a/tests/SynthT.cpp
+++ b/tests/SynthT.cpp
@@ -1811,3 +1811,20 @@ TEST_CASE("[Keyswitches] Trigger from aftertouch extended CC")
     synth.renderBlock(buffer);
     REQUIRE(synth.getNumActiveVoices() == 2);
 }
+
+TEST_CASE("[Synth] Short empty files are turned into *silence")
+{
+    sfz::Synth synth;
+    std::vector<std::string> messageList;
+    sfz::Client client(&messageList);
+    client.setReceiveCallback(&simpleMessageReceiver);
+    sfz::AudioBuffer<float> buffer { 2, static_cast<unsigned>(synth.getSamplesPerBlock()) };
+    synth.loadSfzString(fs::current_path() / "tests/TestFiles/aftertouch_trigger.sfz", R"(
+        <region> sample=silence.wav
+    )");
+    synth.dispatchMessage(client, 0, "/region0/sample", "", nullptr);
+    std::vector<std::string> expected {
+        "/region0/sample,s : { *silence }",
+    };
+    REQUIRE(messageList == expected);
+}
diff --git a/tests/TestFiles/root_key_38.flac b/tests/TestFiles/root_key_38.flac
index d8eefb36ad9420da8054eb2edc8bac8162343d5e..d650d48d959ba15179b88f6df4e8a9d56281b559 100644
GIT binary patch
delta 4665
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diff --git a/tests/TestFiles/root_key_38.wav b/tests/TestFiles/root_key_38.wav
index e7a27089c869484b53a1de2bf5911108f4c2f0ba..83dcb92c0fb3bbb50074a2734d18653e69bcc59e 100644
GIT binary patch
delta 4539
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delta 23
ccmcbk9K{yo>E;&1Fp*7eVvPYC69WhU08DNK(*OVf

diff --git a/tests/TestFiles/root_key_62.flac b/tests/TestFiles/root_key_62.flac
index 10006b5812e4655388fcfe0d445c37bdc583b5ef..9fc639190946924ee738272f8c9e5bd31d29c30f 100644
GIT binary patch
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delta 136
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diff --git a/tests/TestFiles/root_key_62.wav b/tests/TestFiles/root_key_62.wav
index 658d5bd4d6d4510e649e6061feb7258c926a0d23..51790923c00abf18decd44d8e7029f28bc8c53f2 100644
GIT binary patch
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delta 23
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diff --git a/tests/TestFiles/silence.wav b/tests/TestFiles/silence.wav
new file mode 100644
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GIT binary patch
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