93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
#ifndef __RESAMPLER_H__
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#define __RESAMPLER_H__
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include "../stdtype.h"
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#include "snddef.h" // for DEV_SMPL
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#include "EmuStructs.h"
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typedef struct _waveform_32bit_stereo
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{
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DEV_SMPL L;
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DEV_SMPL R;
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} WAVE_32BS;
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typedef struct _resampling_state
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{
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UINT32 smpRateSrc;
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UINT32 smpRateDst;
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INT16 volumeL;
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INT16 volumeR;
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// Resampler Type:
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// 00 - Old
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// 01 - Upsampling
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// 02 - Copy
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// 03 - Downsampling
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UINT8 resampleMode; // can be FF [auto] or Resampler Type
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UINT8 resampler;
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DEVFUNC_UPDATE StreamUpdate;
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void* su_DataPtr;
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UINT32 smpP; // Current Sample (Playback Rate)
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UINT32 smpLast; // Sample Number Last
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UINT32 smpNext; // Sample Number Next
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WAVE_32BS lSmpl; // Last Sample
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WAVE_32BS nSmpl; // Next Sample
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UINT32 smplBufSize;
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DEV_SMPL* smplBufs[2];
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} RESMPL_STATE;
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// ---- resampler helper functions (for quick/comfortable initialization) ----
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/**
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* @brief Sets up a the resampler to use a certain sound device.
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*
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* @param CAA resampler to be connected to a device
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* @param devInf device to be used by the resampler
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*/
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void Resmpl_DevConnect(RESMPL_STATE* CAA, const DEV_INFO* devInf);
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/**
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* @brief Helper function to quickly set resampler configuration values.
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*
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* @param CAA resampler to be configured
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* @param resampleMode resampling mode, 0xFF = auto
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* @param volume volume gain applied during resampling process, 8.8 fixed point, 0x100 equals 100%
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* @param destSampleRate sample rate of the output stream
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*/
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void Resmpl_SetVals(RESMPL_STATE* CAA, UINT8 resampleMode, UINT16 volume, UINT32 destSampleRate);
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// ---- resampler main functions ----
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/**
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* @brief Initializes a resampler. The resampler must be configured and connected to a device.
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*
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* @param CAA resampler to be initialized
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*/
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void Resmpl_Init(RESMPL_STATE* CAA);
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/**
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* @brief Deinitializes a resampler and frees used memory.
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*
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* @param CAA resampler to be deinitialized
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*/
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void Resmpl_Deinit(RESMPL_STATE* CAA);
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/**
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* @brief Sets the sample rate of the sound device. Used for sample rate changes without deinit/init.
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*
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* @param CAA resampler whose input sample rate is changed
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*/
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void Resmpl_ChangeRate(void* DataPtr, UINT32 newSmplRate);
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/**
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* @brief Request and resample input data in order to render samples into the output buffer.
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*
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* @param CAA resampler to be executed
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* @param samples number of output samples to be rendered
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* @param smplBuffer buffer for output data
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*/
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void Resmpl_Execute(RESMPL_STATE* CAA, UINT32 samples, WAVE_32BS* smplBuffer);
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#ifdef __cplusplus
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}
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#endif
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#endif // __RESAMPLER_H__
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