Start on opus decoder structure

1 files changed, 49 insertions, 0 deletions

diff --git a/src/codecs/include/opus.hpp b/src/codecs/include/opus.hpp
new file mode 100644
index 00000000..a5a7d78c
--- /dev/null
+++ b/src/codecs/include/opus.hpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <string>
+#include <utility>
+
+#include "opus.h"
+#include "span.hpp"
+
+#include "codec.hpp"
+
+namespace codecs {
+
+class XiphOpusDecoder : public ICodec {
+ public:
+  XiphOpusDecoder();
+  ~XiphOpusDecoder();
+
+  /*
+   * Returns the output format for the next frame in the stream. MP3 streams
+   * may represent multiple distinct tracks, with different bitrates, and so we
+   * handle the stream only on a frame-by-frame basis.
+   */
+  auto BeginStream(cpp::span<const std::byte>) -> Result<OutputFormat> override;
+
+  /*
+   * Writes samples for the current frame.
+   */
+  auto ContinueStream(cpp::span<const std::byte> input,
+                      cpp::span<std::byte> output)
+      -> Result<OutputInfo> override;
+
+  auto SeekStream(cpp::span<const std::byte> input, std::size_t target_sample)
+      -> Result<void> override;
+
+ private:
+  OpusDecoder *opus_;
+  float *sample_buffer_;
+  std::size_t sample_buffer_len_;
+}  // namespace codecs