28 lines
571 B
C
28 lines
571 B
C
/*
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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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#ifndef ADPCM_H
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#define ADPCM_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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};
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//len 是采样点的个数，不是字节大小
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int adpcm_coder(short* indata, char* outdata, int len, struct adpcm_state* state);
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int adpcm_decoder(char* indata, short* outdata, int len, struct adpcm_state* state);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* ADPCM_H*/
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