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- /*
- ********************************************************************************
- *
- * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
- * R99 Version 3.3.0
- * REL-4 Version 4.1.0
- *
- ********************************************************************************
- *
- * File : d_gain_c.h
- * Purpose : Decode the fixed codebook gain using the received index.
- *
- ********************************************************************************
- */
- #ifndef d_gain_c_h
- #define d_gain_c_h "$Id $"
-
- /*
- ********************************************************************************
- * INCLUDE FILES
- ********************************************************************************
- */
- #include "typedef.h"
- #include "mode.h"
- #include "gc_pred.h"
-
- /*
- ********************************************************************************
- * DECLARATION OF PROTOTYPES
- ********************************************************************************
- */
- /*
- **************************************************************************
- *
- * Function : d_gain_code
- * Purpose : Decode the fixed codebook gain using the received index.
- * Description : The received index gives the gain correction factor
- * gamma. The quantized gain is given by g_q = g0 * gamma
- * where g0 is the predicted gain. To find g0, 4th order
- * MA prediction is applied to the mean-removed innovation
- * energy in dB.
- * Returns : void
- *
- **************************************************************************
- */
- void d_gain_code (
- gc_predState *pred_state, /* i/o : MA predictor state */
- enum Mode mode, /* i : AMR mode */
- Word16 index, /* i : received quantization index */
- Word16 code[], /* i : innovation codevector */
- Word16 *gain_code /* o : decoded innovation gain */
- );
-
- #endif
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