36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
/*
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* g72x_state.h - internal state used by g721 decoder
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*/
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#ifndef _G72X_STATE_H
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#define _G72X_STATE_H
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struct g72x_state {
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long yl; /* Locked or steady state step size multiplier. */
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short yu; /* Unlocked or non-steady state step size multiplier. */
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short dms; /* Short term energy estimate. */
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short dml; /* Long term energy estimate. */
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short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */
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short a[2]; /* Coefficients of pole portion of prediction filter. */
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short b[6]; /* Coefficients of zero portion of prediction filter. */
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short pk[2]; /*
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* Signs of previous two samples of a partially
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* reconstructed signal.
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*/
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short dq[6]; /*
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* Previous 6 samples of the quantized difference
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* signal represented in an internal floating point
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* format.
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*/
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short sr[2]; /*
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* Previous 2 samples of the quantized difference
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* signal represented in an internal floating point
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* format.
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*/
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char td; /* delayed tone detect, new in 1988 version */
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};
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#endif
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