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CrySoundSystem/PCMDecoder.h

@@ -0,0 +1,79 @@
+#pragma once
+
+#include "PatternDecoder.h"
+
+struct IMusicSystem;
+class CPCMDecoderInstance;
+struct ICryPak;
+
+struct SPCMFileInfo 
+{
+	SPCMFileInfo()
+	{
+		nBytesPerSample=0;
+	}
+	int nBytesPerSample;
+};
+
+class CPCMDecoder :	public IMusicPatternDecoder
+{
+protected:
+	IMusicSystem *m_pMusicSystem;
+	ICryPak *m_pPak;
+	FILE *m_pFile;
+	int m_nPosBytes;	// current position (in bytes) in the file to reduce seeking-overhead
+	SMusicPatternFileInfo m_FileInfo;
+	SPCMFileInfo m_PCMFileInfo;
+	friend class CPCMDecoderInstance;
+private:
+	bool m_b44KHz;	//keeps track of encoded frequency
+
+	int ReadFile(void *pBuf, int nSize, int nCount, int *pNewFilePos=NULL);
+	bool InitStreamWAV();
+protected:
+	virtual ~CPCMDecoder();
+public:
+	CPCMDecoder(IMusicSystem *pMusicSystem); 
+	void Release() { delete this; }
+	//! Open a music-pattern-file.
+	bool Open(const char *pszFilename);
+	//! Close a music-pattern-file.
+	bool Close();
+	//! Retrieve file-info
+	bool GetFileInfo(SMusicPatternFileInfo &FileInfo);
+	//! Retrieve mem-info
+	void GetMemoryUsage(class ICrySizer* pSizer);
+	//! Create instance.
+	IMusicPatternDecoderInstance* CreateInstance();
+	//! retrieves frequency encoding
+	const bool Is44KHz() const {return m_b44KHz;}
+};
+
+class CPCMDecoderInstance : public IMusicPatternDecoderInstance
+{
+	static const unsigned int scuiEncodedBlockSize = 2048;	//block size for static allocation
+
+protected:
+	CPCMDecoder *m_pDecoder;
+	int			m_nPos;					// position in samples
+	int			m_nPosBytes;			// file position in bytes
+	bool		m_bCopyFromLastFrame;	// indicates some copying from last frame (due to odd sample count request)
+	signed long m_lLastSample;			// sample to reuse for next frame 
+private:
+	bool SeekBytes(int nBytes);
+protected:
+	unsigned int   m_aEncodedBlock[scuiEncodedBlockSize];			//static allocated encoded block, only needed for 22 kHz mode
+	//! fills a dest buffer with uncompressed data
+	const bool FillPCMBuffer22KHz(signed long *pBuffer, int nSamples);
+
+	virtual ~CPCMDecoderInstance();
+public:
+	CPCMDecoderInstance(CPCMDecoder *pDecoder);
+	void Release() { delete this; }
+	//! Seek to beginning of pattern (if nDelay is set it will wait nDelay-samples before starting playback).
+	bool Seek0(int nDelay=0);
+	//! Retrieve the current position in the file (in samples)
+	int GetPos();
+	//! Decode and retrieve pcm-data (stereo/16bit).
+	bool GetPCMData(signed long *pDataOut, int nSamples, bool bLoop=true);
+};