g72x.h

zigbee 飞思卡尔 音频传输 基于ucos的所有源码

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/*
 * The following is the definition of the state structure
 * used by the G.721/G.723 encoder and decoder to preserve their internal
 * state between successive calls.  The meanings of the majority
 * of the state structure fields are explained in detail in the
 * CCITT Recommendation G.721.  The field names are essentially indentical
 * to variable names in the bit level description of the coding algorithm
 * included in this Recommendation.
 */
typedef struct g726_state_s {
	long yl;	/* Locked or steady state step size multiplier. */
	int yu;		/* Unlocked or non-steady state step size multiplier. */
	int dms;	/* Short term energy estimate. */
	int dml;	/* Long term energy estimate. */
	int ap;		/* Linear weighting coefficient of 'yl' and 'yu'. */

	int a[2];	/* Coefficients of pole portion of prediction filter. */
	int b[6];	/* Coefficients of zero portion of prediction filter. */
	int pk[2];	/* Signs of previous two samples of a partially
				 * reconstructed signal. */
	short dq[6];/* int here fails in newupdate on encode!
				 * Previous 6 samples of the quantized difference
				 * signal represented in an internal floating point
				 * format.
				 */
	int sr[2];	/* Previous 2 samples of the quantized difference
				 * signal represented in an internal floating point
				 * format. */
	int td;		/* delayed tone detect, new in 1988 version */
} g726_state;