Initial commit

arm9/source/bgm/BcstmAudioStream.h

@@ -0,0 +1,66 @@
+#pragma once
+#include "common.h"
+#include <memory>
+#include "fat/File.h"
+#include "IAudioStream.h"
+#include "bcstm.h"
+
+struct DspAdpcmContext
+{
+    const s16* coefTable;
+    const u8* data;
+    s16 frameData[14];
+    u8 frameIdx;
+
+    void SetData(const u8* data)
+    {
+        this->data = data;
+        frameIdx = 0;
+    }
+};
+
+class alignas(32) BcstmAudioStream : public IAudioStream
+{
+public:
+    /// @brief Opens the given file. Call this function before
+    ///        using ReadSamples.
+    /// @param filePath The path of the file to open.
+    /// @return True if the file was successfully opened, or false otherwise.
+    bool Open(const TCHAR* filePath);
+
+    /// @brief Opens the given file. Call this function before
+    ///        using ReadSamples.
+    /// @param filePath The path of the file to open.
+    /// @return True if the file was successfully opened, or false otherwise.
+    bool Open(const FastFileRef& fastFileRef);
+
+    void Close() override;
+    void ReadSamples(s16* left, s16* right, u32 count) override;
+
+    u32 GetSampleRate() const override
+    {
+        return _streamInfo.sampleRate;
+    }
+
+private:
+    File _audioFile alignas(32);
+    DWORD _clusterTable[1024] alignas(32);
+    bcstm_info_stream_t _streamInfo;
+    bcstm_dspadpcm_t _dspAdpcmInfo[2];
+    u32 _dataOffset;
+    std::unique_ptr<u8[]> _adpcmBlocks[2];
+    u32 _channels;
+    u32 _blockNumber;
+    u32 _sampleNumberInBlock;
+    u32 _loopBlockNumber;
+    u32 _loopEndBlockNumber;
+    u32 _loopBlockStartSample;
+    u32 _loopEndBlockEndSample;
+    DspAdpcmContext _dspAdpcmContexts[2];
+
+    bool TryLoadBcstm();
+    u32 GetTotalSamplesInCurrentBlock();
+    void FetchBlock();
+    void DecodeAdpcmSamples(DspAdpcmContext& context, s16* dst, u32 count);
+    void DecodeLoopAdpcmFrame(DspAdpcmContext& context, u32 scaleCoef, s16 last1, s16 last2, u32 sampleOffset);
+};