Merge pull request #170 from paulfd/offset-cc

Add support for `offset_cc`

src/sfizz/Defaults.h

@@ -46,9 +46,10 @@ namespace Default
 	constexpr float delay { 0.0 };
 	constexpr float delayRandom { 0.0 };
 	constexpr Range<float> delayRange { 0.0, 100.0 };
-	constexpr uint32_t offset { 0 };
-	constexpr uint32_t offsetRandom { 0 };
-	constexpr Range<uint32_t> offsetRange { 0, std::numeric_limits<uint32_t>::max() };
+	constexpr int64_t offset { 0 };
+	constexpr int64_t offsetRandom { 0 };
+	constexpr Range<int64_t> offsetRange { 0, std::numeric_limits<uint32_t>::max() };
+	constexpr Range<int64_t> offsetCCRange = offsetRange;
 	constexpr Range<uint32_t> sampleEndRange { 0, std::numeric_limits<uint32_t>::max() };
 	constexpr Range<uint32_t> sampleCountRange { 0, std::numeric_limits<uint32_t>::max() };
 	constexpr SfzLoopMode loopMode { SfzLoopMode::no_loop };

src/sfizz/Region.cpp

@@ -59,6 +59,12 @@ bool sfz::Region::parseOpcode(const Opcode& opcode)
     case hash("offset_random"):
         setValueFromOpcode(opcode, offsetRandom, Default::offsetRange);
         break;
+    case hash("offset_cc&"):
+        if (opcode.parameters.back() > config::numCCs)
+            return false;
+        if (auto value = readOpcode(opcode.value, Default::offsetCCRange))
+            offsetCC[opcode.parameters.back()] = *value;
+        break;
     case hash("end"):
         setValueFromOpcode(opcode, sampleEnd, Default::sampleEndRange);
         break;
@@ -1134,10 +1140,13 @@ float sfz::Region::getPhase() const noexcept
     return phase;
 }
 
-uint32_t sfz::Region::getOffset(Oversampling factor) const noexcept
+uint64_t sfz::Region::getOffset(Oversampling factor) const noexcept
 {
-    std::uniform_int_distribution<uint32_t> offsetDistribution { 0, offsetRandom };
-    return (offset + offsetDistribution(Random::randomGenerator)) * static_cast<uint32_t>(factor);
+    std::uniform_int_distribution<int64_t> offsetDistribution { 0, offsetRandom };
+    uint64_t finalOffset = offset + offsetDistribution(Random::randomGenerator);
+    for (const auto& mod: offsetCC)
+        finalOffset += static_cast<uint64_t>(mod.data * midiState.getCCValue(mod.cc));
+    return Default::offsetCCRange.clamp(offset + offsetDistribution(Random::randomGenerator)) * static_cast<uint64_t>(factor);
 }
 
 float sfz::Region::getDelay() const noexcept

src/sfizz/Region.h

@@ -189,7 +189,7 @@ struct Region {
      *
      * @return uint32_t
      */
-    uint32_t getOffset(Oversampling factor = Oversampling::x1) const noexcept;
+    uint64_t getOffset(Oversampling factor = Oversampling::x1) const noexcept;
     /**
      * @brief Get the region delay in seconds
      *
@@ -230,8 +230,9 @@ struct Region {
     std::string sample {}; // Sample
     float delay { Default::delay }; // delay
     float delayRandom { Default::delayRandom }; // delay_random
-    uint32_t offset { Default::offset }; // offset
-    uint32_t offsetRandom { Default::offsetRandom }; // offset_random
+    int64_t offset { Default::offset }; // offset
+    int64_t offsetRandom { Default::offsetRandom }; // offset_random
+    CCMap<int64_t> offsetCC { Default::offset };
     uint32_t sampleEnd { Default::sampleEndRange.getEnd() }; // end
     absl::optional<uint32_t> sampleCount {}; // count
     absl::optional<SfzLoopMode> loopMode {}; // loopmode

src/sfizz/Synth.cpp

@@ -374,7 +374,13 @@ bool sfz::Synth::loadSfzFile(const fs::path& file)
                 region->hasStereoSample = true;
 
             // TODO: adjust with LFO targets
-            const auto maxOffset = region->offset + region->offsetRandom;
+            const auto maxOffset = [region]() {
+                uint64_t sumOffsetCC = region->offset + region->offsetRandom;
+                for (const auto& offsets: region->offsetCC)
+                    sumOffsetCC += offsets.data;
+                return Default::offsetCCRange.clamp(sumOffsetCC);
+            }();
+
             if (!resources.filePool.preloadFile(region->sample, maxOffset))
                 removeCurrentRegion();
         }

tests/RegionT.cpp

@@ -53,6 +53,19 @@ TEST_CASE("[Region] Parsing opcodes")
         region.parseOpcode({ "offset", "-1" });
         REQUIRE(region.offset == 0);
     }
+    SECTION("offset_cc")
+    {
+        REQUIRE(region.offsetCC.empty());
+        region.parseOpcode({ "offset_cc1", "1" });
+        REQUIRE(region.offsetCC.contains(1));
+        REQUIRE(region.offsetCC[1] == 1);
+        region.parseOpcode({ "offset_cc2", "15420" });
+        REQUIRE(region.offsetCC.contains(2));
+        REQUIRE(region.offsetCC[2] == 15420);
+        region.parseOpcode({ "offset_cc2", "-1" });
+        REQUIRE(region.offsetCC[2] == 0);
+    }
+
 
     SECTION("offset_random")
     {