1 files changed, 88 insertions, 0 deletions
diff --git a/src/codecs/test/test_mad.cpp b/src/codecs/test/test_mad.cpp
new file mode 100644
index 00000000..388efa17
--- /dev/null
+++ b/src/codecs/test/test_mad.cpp
@@ -0,0 +1,88 @@
+#include "mad.hpp"
+
+#include <cstdint>
+#include <algorithm>
+
+#include "span.hpp"
+#include "catch2/catch.hpp"
+
+#include "test.mp3.hpp"
+
+void load_mp3(cpp::span<std::byte> dest) {
+  cpp::span<std::byte> src(reinterpret_cast<std::byte*>(test_mp3), test_mp3_len);
+  std::copy(src.begin(), src.begin() + dest.size(), dest.begin());
+}
+
+namespace codecs {
+
+TEST_CASE("libmad mp3 decoder", "[unit]") {
+  MadMp3Decoder decoder;
+
+  SECTION("handles only mp3 files") {
+    REQUIRE(decoder.CanHandleFile("cool.mp3") == true);
+    REQUIRE(decoder.CanHandleFile("bad.wma") == false);
+  }
+
+  SECTION("processes streams correctly") {
+    std::array<std::byte, 256> input;
+    input.fill(std::byte{0});
+
+    decoder.ResetForNewStream();
+    decoder.SetInput(input);
+
+    SECTION("empty stream fails gracefully") {
+      auto result = decoder.ProcessNextFrame();
+
+      REQUIRE(result.has_value());
+      REQUIRE(result.value() == true);
+    }
+
+    SECTION("invalid stream fails") {
+      input.fill(std::byte{0xFF});
+
+      auto result = decoder.ProcessNextFrame();
+
+      REQUIRE(result.has_error());
+      REQUIRE(result.error() == ICodec::MALFORMED_DATA);
+    }
+
+    SECTION("valid stream parses successfully") {
+      load_mp3(input);
+
+      auto result = decoder.ProcessNextFrame();
+
+      REQUIRE(result.has_value());
+      REQUIRE(result.value() == false);
+
+      SECTION("output samples synthesized") {
+        std::array<std::byte, 256> output;
+        output.fill(std::byte{0});
+
+        auto res = decoder.WriteOutputSamples(output);
+
+        REQUIRE(res.first > 0);
+        REQUIRE(res.second == false);
+
+        // Just check that some kind of data was written. We don't care
+        // about what.
+        REQUIRE(std::to_integer<uint8_t>(output[0]) != 0);
+        REQUIRE(std::to_integer<uint8_t>(output[1]) != 0);
+        REQUIRE(std::to_integer<uint8_t>(output[2]) != 0);
+        REQUIRE(std::to_integer<uint8_t>(output[3]) != 0);
+      }
+
+      SECTION("output format correct") {
+        auto format = decoder.GetOutputFormat();
+
+        // Matches the test data.
+        REQUIRE(format.num_channels == 2);
+        REQUIRE(format.sample_rate_hz == 44100);
+        // Matches libmad output
+        REQUIRE(format.bits_per_sample == 24);
+      }
+    }
+
+  }
+}
+
+}  // namespace codecs