71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
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/*
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** adpcm.h - include file for adpcm coder.
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**
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** Version 1.0, 7-Jul-92.
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*/
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struct adpcm_state {
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short valprev; /* Previous output value */
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char index; /* Index into stepsize table */
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}__attribute__((packed));
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typedef struct adpcm_state adpcm_state_t;
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/**
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* @brief adpcm encoder
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*
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* This API encoder pcm data through adpcm
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*
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* Usage example:
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*
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*
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* adpcm_state_t state;
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* state.valprev = 0;
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* state.index = 0;
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*
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* uint8_t ucInBuff[1024] = {0}; //save pcm data
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* uint8_t ucOutBuff[256] = {0}; //save output data
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*
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* //run encoder
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* adpcm_coder((short *)ucInBuff, (char *)ucOutBuff, 1024/2, &state);
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*
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*
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* @param indata pcm data buffer
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* @param outdata output data buffer
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* @param len pcm data number of indata(sizeof(indata)/2)
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* @param state adpcm state
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*
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* @return none
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*/
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void adpcm_coder(short indata[], char outdata[], int len, adpcm_state_t *state);
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/**
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* @brief adpcm decoder
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*
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* This API decoder data to pcm through adpcm
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*
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* Usage example:
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*
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*
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* adpcm_state_t state;
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* state.valprev = 0;
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* state.index = 0;
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*
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* uint8_t ucInBuff[256] = {0}; //save input data
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* uint8_t ucOutBuff[1024] = {0}; //save output data
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*
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* //run decoder
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* adpcm_decoder((char *)ucInBuff, (short *)ucOutBuff, 256*2, &state);
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*
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*
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* @param indata input data buffer
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* @param outdata output data buffer
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* @param len pcm data number of indata(sizeof(indata)*2)
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* @param state adpcm state
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*
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* @return none
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*/
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void adpcm_decoder(char indata[], short outdata[], int len, adpcm_state_t *state);
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