Add a 'decoder' for streams already in our native format

1 files changed, 48 insertions, 0 deletions

diff --git a/src/codecs/native.cpp b/src/codecs/native.cpp
new file mode 100644
index 00000000..124434e8
--- /dev/null
+++ b/src/codecs/native.cpp
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "native.hpp"
+
+#include <cstdint>
+#include <cstring>
+#include <optional>
+
+#include "esp_heap_caps.h"
+#include "mad.h"
+
+#include "codec.hpp"
+#include "esp_log.h"
+#include "result.hpp"
+#include "sample.hpp"
+#include "types.hpp"
+
+namespace codecs {
+
+NativeDecoder::NativeDecoder() : input_() {}
+
+auto NativeDecoder::OpenStream(std::shared_ptr<IStream> input, uint32_t offset)
+    -> cpp::result<OutputFormat, ICodec::Error> {
+  input_ = input;
+  return OutputFormat{
+      .num_channels = 1,
+      .sample_rate_hz = 48000,
+      .total_samples = {},
+  };
+}
+
+auto NativeDecoder::DecodeTo(std::span<sample::Sample> output)
+    -> cpp::result<OutputInfo, Error> {
+  size_t bytes = input_->Read({
+      reinterpret_cast<std::byte*>(output.data()),
+      output.size_bytes(),
+  });
+  return OutputInfo{
+      .samples_written = bytes / sizeof(sample::Sample),
+      .is_stream_finished = false,
+  };
+}
+
+}  // namespace codecs