Do our own resampling

src/audio/include/resample.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <sys/_stdint.h>
+#include <vector>
+
+#include "span.hpp"
+
+#include "sample.hpp"
+
+namespace audio {
+
+class Channel;
+
+class Resampler {
+ public:
+  Resampler(uint32_t source_sample_rate,
+            uint32_t target_sample_rate,
+            uint8_t num_channels);
+
+  ~Resampler();
+
+  auto source_sample_rate() -> uint32_t { return source_sample_rate_; }
+  auto target_sample_rate() -> uint32_t { return target_sample_rate_; }
+  auto channels() -> uint_fast8_t { return num_channels_; }
+
+  auto Process(cpp::span<const sample::Sample> input,
+               cpp::span<sample::Sample> output,
+               bool end_of_data) -> std::pair<size_t,size_t>;
+
+ private:
+  auto ApplyDither(cpp::span<sample::Sample>) -> void;
+
+  uint32_t source_sample_rate_;
+  uint32_t target_sample_rate_;
+  uint32_t factor_;
+
+  uint8_t num_channels_;
+  std::vector<Channel> channels_;
+};
+
+}  // namespace audio