wav-codec (#13)

here is a wav decoder, enjoy!

Reviewed-on: https://codeberg.org/cool-tech-zone/tangara-fw/pulls/13
Reviewed-by: cooljqln <cooljqln@noreply.codeberg.org>
Co-authored-by: ailurux <ailuruxx@gmail.com>
Co-committed-by: ailurux <ailuruxx@gmail.com>

4 files changed, 63 insertions, 6 deletions

diff --git a/src/codecs/include/codec.hpp b/src/codecs/include/codec.hpp
index 87f6637c..36dda8ff 100644
--- a/src/codecs/include/codec.hpp
+++ b/src/codecs/include/codec.hpp
@@ -76,6 +76,8 @@ class ICodec {
     kOutOfInput,
     // Indicates that the data within the input buffer is fatally malformed.
     kMalformedData,
+    // Indicated that the format is unsupported
+    kUnsupportedFormat,
 
     kInternalError,
   };
@@ -88,6 +90,8 @@ class ICodec {
         return "malformed data";
       case Error::kInternalError:
         return "internal error";
+      case Error::kUnsupportedFormat:
+        return "unsupported format";
     }
     return "uhh";
   }
diff --git a/src/codecs/include/sample.hpp b/src/codecs/include/sample.hpp
index 7e550680..7b3f96a3 100644
--- a/src/codecs/include/sample.hpp
+++ b/src/codecs/include/sample.hpp
@@ -24,10 +24,6 @@ namespace sample {
 //  3. Monty from Xiph.org reckons it's all you need.
 typedef int16_t Sample;
 
-constexpr auto Clip(int64_t v) -> Sample {
-  return std::clamp<int64_t>(v, INT16_MIN, INT16_MAX);
-}
-
 auto shiftWithDither(int64_t src, uint_fast8_t bits) -> Sample;
 
 constexpr auto FromSigned(int32_t src, uint_fast8_t bits) -> Sample {
@@ -42,7 +38,7 @@ constexpr auto FromSigned(int32_t src, uint_fast8_t bits) -> Sample {
 constexpr auto FromUnsigned(uint32_t src, uint_fast8_t bits) -> Sample {
   // Left-align, then substract the max value / 2 to make the sample centred
   // around zero.
-  return (src << (sizeof(uint16_t) * 8 - bits)) - (~0UL >> 1);
+  return (src << (sizeof(uint16_t) * 8 - bits)) - (INT16_MAX+1);
 }
 
 constexpr auto FromFloat(float src) -> Sample {
diff --git a/src/codecs/include/types.hpp b/src/codecs/include/types.hpp
index c9eefe45..c6dcb486 100644
--- a/src/codecs/include/types.hpp
+++ b/src/codecs/include/types.hpp
@@ -12,10 +12,10 @@ namespace codecs {
 
 enum class StreamType {
   kMp3,
-  kPcm,
   kVorbis,
   kFlac,
   kOpus,
+  kWav,
 };
 
 auto StreamTypeToString(StreamType t) -> std::string;
diff --git a/src/codecs/include/wav.hpp b/src/codecs/include/wav.hpp
new file mode 100644
index 00000000..896976dd
--- /dev/null
+++ b/src/codecs/include/wav.hpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2023 Daniel <ailuruxx@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <string>
+#include <utility>
+
+#include "sample.hpp"
+#include "source_buffer.hpp"
+
+#include "codec.hpp"
+
+namespace codecs {
+
+static const uint16_t kWaveFormatPCM = 0x0001;
+static const uint16_t kWaveFormatIEEEFloat = 0x0003;
+static const uint16_t kWaveFormatAlaw = 0x0006;
+static const uint16_t kWaveFormatMulaw = 0x0007;
+static const uint16_t kWaveFormatExtensible = 0xFFFE;
+
+class WavDecoder : public ICodec {
+ public:
+  WavDecoder();
+  ~WavDecoder();
+
+  auto OpenStream(std::shared_ptr<IStream> input)
+      -> cpp::result<OutputFormat, Error> override;
+
+  auto DecodeTo(cpp::span<sample::Sample> destination)
+      -> cpp::result<OutputInfo, Error> override;
+
+  auto SeekTo(std::size_t target_sample) -> cpp::result<void, Error> override;
+
+  WavDecoder(const WavDecoder&) = delete;
+  WavDecoder& operator=(const WavDecoder&) = delete;
+
+ private:
+  std::shared_ptr<IStream> input_;
+  SourceBuffer buffer_;
+  uint16_t wave_format_;
+  uint16_t subformat_;
+  OutputFormat output_format_;
+  uint16_t bytes_per_sample_;
+  uint16_t num_channels_;
+
+  auto GetFormat() const -> uint16_t;
+};
+
+}  // namespace codecs