305 řádky
12 KiB
ArmAsm
305 řádky
12 KiB
ArmAsm
/**************************************************************************
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*
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* ITU-T SOFTWARE TOOLS' GENERAL PUBLIC LICENSE
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*
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* This "General Public License" is published in the Annex 1 of the
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* ITU-T Recommendation on "SOFTWARE TOOLS FOR HOMOGENITY OF RESULTS
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* approved in Geneva, 2000.
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* SUCH DAMAGES.
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*
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* END OF TERMS AND CONDITIONS
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***************************************************************************/
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;------------------------------------------------------------------------------
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;Decoder state members
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/*typedef struct
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{
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short dq0;
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short dq0_exp;
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short dq1; ;Quantized difference signal with delays 5 * to 0
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short dq1_exp;
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short dq2;
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short dq2_exp;
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short dq3;
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short dq3_exp;
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short dq4;
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short dq4_exp;
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short dq5;
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short dq5_exp;
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short sr0;
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short sr0_exp;
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short sr1; ;Reconstructed signal with delays 0 and 1
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short sr1_exp;
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short a1r;
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short a2r; ;Triggered 2nd order predictor coeffs.
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short b1r; ;Triggered 6nd order predictor coeffs
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short b2r;
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short b3r;
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short b4r;
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short b5r;
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short b6r;
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short yup; ;Fast quantizer scale factor;
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short dmsp; ;Short term average of the F(I) sequence
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short dmlp; ;Long term average of the F(I) sequence
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short apr; ;Triggered unlimited speed control * parameter
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short tdr; ;Triggered tone detector
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short pk0;
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short pk1; ;sign of dq+sez with delays 0 and 1
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long ylp; ;Slow quantizer scale factor
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short leak;
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short rate; ;Modified by Adeptte
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short slen;
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short *table;
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short (*quan_fptr)(short dln, short ds);
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} G726_state;*/
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;------------------------------------------------------------------------------
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;------------------------------------------------------------------------------
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;External Variables
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;------------------------------------------------------------------------------
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.extern _G726A_tab
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;------------------------------------------------------------------------------
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;Global Declarations:
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;------------------------------------------------------------------------------
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.global _G726ADecoderInit
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;------------------------------------------------------------------------------
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;Code Section in Program Memory
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;------------------------------------------------------------------------------
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.section libg726a, code
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/******************************************************************************
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*
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* Function Name: G726_decoder_init
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*
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* System: RISC
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*
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* Platform: dsPIC33F
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*
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* Description: Initializes the decoder state
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*
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* Cycle Count: 96
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*
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* Input Parameters: w0 - Pointer to decoder state
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* w1 - Bit Rate
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*
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* Output Parameters: None
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*
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* History:
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*
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* Date | By | Remarks
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* ---------------+-------------------+----------------------------------
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* Oct-21-2005 Sharanabasava M. Created.
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* Jan-11-2010 Sankaralingam.M Modified
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******************************************************************************/
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.text
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_G726ADecoderInit:
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mov #32,w3
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mov #544,w4
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mov #1,w5
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mov #34816,w6
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mov w2,[w0+70] ;slen ;Adeptte
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do #7,DQSRINIT
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mov w3,[w0++]
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DQSRINIT:
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clr [w0++]
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repeat #7
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clr [w0++]
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mov w4,[w0++]
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repeat #3
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clr [w0++]
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mov w5,[w0++]
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mov w5,[w0++]
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clr w7
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mov.d w6,[w0++]
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mov #8,w7
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mov w7,[w0++]
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mov w1,[w0] ;rate ;Adeptte
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add w0,#4,w3
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mov #_G726A_tab,w4 ;Adeptte
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cp w1,#5
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bra nz,RATE4
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add w4,#28,w5
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add w5,#28,[w3]
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add w7,#1,[--w0]
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bra RET
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RATE4: cp w1,#4
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bra nz,RATE3
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mov w4,[w3]
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bra RET
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RATE3: cp w1,#3
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bra nz,RATE2
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add w4,#8,[w3]
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bra RET
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RATE2:
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mov w4,[w3]
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RET:
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return
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;--------End of All Code Sections ---------------------------------------------
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.end ;End of program code in this file
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