504 lines
17 KiB
C
504 lines
17 KiB
C
/********************************************************************************
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**
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** ITU-T G.722.1 (2005-05) - Fixed point implementation for main body and Annex C
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** > Software Release 2.1 (2008-06)
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** (Simple repackaging; no change from 2005-05 Release 2.0 code)
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**
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** © 2004 Polycom, Inc.
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**
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** All rights reserved.
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**
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********************************************************************************/
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/********************************************************************************
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* Filename: dct_type_iv_s.c
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*
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* Purpose: Discrete Cosine Transform, Type IV used for inverse MLT
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*
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* The basis functions are
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*
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* cos(PI*(t+0.5)*(k+0.5)/block_length)
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*
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* for time t and basis function number k. Due to the symmetry of the expression
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* in t and k, it is clear that the forward and inverse transforms are the same.
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*
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*********************************************************************************/
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/***************************************************************************
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Include files
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***************************************************************************/
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#include "defs.h"
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#include "count.h"
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#include "dct4_s.h"
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/***************************************************************************
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External variable declarations
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***************************************************************************/
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extern Word16 syn_bias_7khz[DCT_LENGTH];
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extern Word16 dither[DCT_LENGTH];
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extern Word16 max_dither[MAX_DCT_LENGTH];
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extern Word16 dct_core_s[DCT_LENGTH_DIV_32][DCT_LENGTH_DIV_32];
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extern cos_msin_t s_cos_msin_2[DCT_LENGTH_DIV_32];
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extern cos_msin_t s_cos_msin_4[DCT_LENGTH_DIV_16];
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extern cos_msin_t s_cos_msin_8[DCT_LENGTH_DIV_8];
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extern cos_msin_t s_cos_msin_16[DCT_LENGTH_DIV_4];
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extern cos_msin_t s_cos_msin_32[DCT_LENGTH_DIV_2];
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extern cos_msin_t s_cos_msin_64[DCT_LENGTH];
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extern cos_msin_t *s_cos_msin_table[];
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/********************************************************************************
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Function: dct_type_iv_s
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Syntax: void dct_type_iv_s (Word16 *input,Word16 *output,Word16 dct_length)
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Description: Discrete Cosine Transform, Type IV used for inverse MLT
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Design Notes:
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WMOPS: 7kHz | 24kbit | 32kbit
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-------|--------------|----------------
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AVG | 1.74 | 1.74
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-------|--------------|----------------
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MAX | 1.74 | 1.74
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-------|--------------|----------------
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14kHz | 24kbit | 32kbit | 48kbit
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-------|--------------|----------------|----------------
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AVG | 3.62 | 3.62 | 3.62
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-------|--------------|----------------|----------------
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MAX | 3.62 | 3.62 | 3.62
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-------|--------------|----------------|----------------
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********************************************************************************/
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void dct_type_iv_s (Word16 *input,Word16 *output,Word16 dct_length)
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{
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Word16 buffer_a[MAX_DCT_LENGTH], buffer_b[MAX_DCT_LENGTH], buffer_c[MAX_DCT_LENGTH];
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Word16 *in_ptr, *in_ptr_low, *in_ptr_high, *next_in_base;
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Word16 *out_ptr_low, *out_ptr_high, *next_out_base;
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Word16 *out_buffer, *in_buffer, *buffer_swap;
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Word16 in_val_low, in_val_high;
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Word16 out_val_low, out_val_high;
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Word16 in_low_even, in_low_odd;
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Word16 in_high_even, in_high_odd;
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Word16 out_low_even, out_low_odd;
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Word16 out_high_even, out_high_odd;
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Word16 *pair_ptr;
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Word16 cos_even, cos_odd, msin_even, msin_odd;
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Word16 set_span, set_count, set_count_log, pairs_left, sets_left;
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Word16 i,k;
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Word16 index;
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Word16 dummy;
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Word32 sum;
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cos_msin_t **table_ptr_ptr, *cos_msin_ptr;
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Word32 acca;
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Word16 temp;
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Word16 dct_length_log;
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Word16 *dither_ptr;
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/*++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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/* Do the sum/difference butterflies, the first part of */
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/* converting one N-point transform into 32 - 10 point transforms */
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/* transforms, where N = 1 << DCT_LENGTH_LOG. */
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/*++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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test();
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if (dct_length==DCT_LENGTH)
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{
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dct_length_log = DCT_LENGTH_LOG;
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move16();
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dither_ptr = dither;
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move16();
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}
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else
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{
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dct_length_log = MAX_DCT_LENGTH_LOG;
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move16();
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dither_ptr = max_dither;
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move16();
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}
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in_buffer = input;
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move16();
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out_buffer = buffer_a;
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move16();
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index=0;
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move16();
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i=0;
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move16();
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for (set_count_log = 0; set_count_log <= dct_length_log - 2; set_count_log++)
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{
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/*===========================================================*/
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/* Initialization for the loop over sets at the current size */
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/*===========================================================*/
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/* set_span = 1 << (DCT_LENGTH_LOG - set_count_log); */
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set_span = shr_nocheck(dct_length,set_count_log);
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set_count = shl_nocheck(1,set_count_log);
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in_ptr = in_buffer;
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move16();
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next_out_base = out_buffer;
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move16();
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/*=====================================*/
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/* Loop over all the sets of this size */
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/*=====================================*/
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temp = sub(index,1);
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test();
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if(temp < 0)
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{
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for (sets_left = set_count;sets_left > 0;sets_left--)
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{
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/*||||||||||||||||||||||||||||||||||||||||||||*/
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/* Set up output pointers for the current set */
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/*||||||||||||||||||||||||||||||||||||||||||||*/
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/* pointer arithmetic */
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out_ptr_low = next_out_base;
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move16();
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next_out_base += set_span;
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move16();
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out_ptr_high = next_out_base;
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move16();
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/*||||||||||||||||||||||||||||||||||||||||||||||||||*/
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/* Loop over all the butterflies in the current set */
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/*||||||||||||||||||||||||||||||||||||||||||||||||||*/
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do
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{
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in_val_low = *in_ptr++;
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move16();
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in_val_high = *in_ptr++;
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move16();
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/* BEST METHOD OF GETTING RID OF BIAS, BUT COMPUTATIONALLY UNPLEASANT */
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/* ALTERNATIVE METHOD, SMEARS BIAS OVER THE ENTIRE FRAME, COMPUTATIONALLY SIMPLEST. */
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/* IF THIS WORKS, IT'S PREFERABLE */
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dummy = add(in_val_low,dither_ptr[i++]);
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// blp: addition of two 16bits vars, there's no way
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// they'll overflow a 32bit var
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//acca = L_add(dummy,in_val_high);
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acca = dummy + in_val_high;
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out_val_low = extract_l(L_shr_nocheck(acca,1));
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dummy = add(in_val_low,dither_ptr[i++]);
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// blp: addition of two 16bits vars, there's no way
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// they'll overflow a 32bit var
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//acca = L_add(dummy,-in_val_high);
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acca = dummy - in_val_high;
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out_val_high = extract_l(L_shr_nocheck(acca,1));
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*out_ptr_low++ = out_val_low;
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move16();
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*--out_ptr_high = out_val_high;
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move16();
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test();
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/* this involves comparison of pointers */
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/* pointer arithmetic */
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} while (out_ptr_low < out_ptr_high);
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} /* End of loop over sets of the current size */
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}
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else
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{
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for (sets_left = set_count; sets_left > 0; sets_left--)
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{
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/*||||||||||||||||||||||||||||||||||||||||||||*/
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/* Set up output pointers for the current set */
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/*||||||||||||||||||||||||||||||||||||||||||||*/
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out_ptr_low = next_out_base;
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move16();
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next_out_base += set_span;
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move16();
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out_ptr_high = next_out_base;
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move16();
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/*||||||||||||||||||||||||||||||||||||||||||||||||||*/
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/* Loop over all the butterflies in the current set */
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/*||||||||||||||||||||||||||||||||||||||||||||||||||*/
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do
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{
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in_val_low = *in_ptr++;
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move16();
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in_val_high = *in_ptr++;
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move16();
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out_val_low = add(in_val_low,in_val_high);
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out_val_high = add(in_val_low,negate(in_val_high));
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*out_ptr_low++ = out_val_low;
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move16();
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*--out_ptr_high = out_val_high;
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move16();
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test();
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} while (out_ptr_low < out_ptr_high);
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} /* End of loop over sets of the current size */
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}
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/*============================================================*/
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/* Decide which buffers to use as input and output next time. */
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/* Except for the first time (when the input buffer is the */
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/* subroutine input) we just alternate the local buffers. */
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/*============================================================*/
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in_buffer = out_buffer;
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move16();
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test();
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if (out_buffer == buffer_a)
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{
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out_buffer = buffer_b;
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move16();
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}
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else
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{
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out_buffer = buffer_a;
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move16();
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}
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index = add(index,1);
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} /* End of loop over set sizes */
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/*++++++++++++++++++++++++++++++++*/
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/* Do 32 - 10 point transforms */
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/*++++++++++++++++++++++++++++++++*/
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pair_ptr = in_buffer;
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move16();
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buffer_swap = buffer_c;
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move16();
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for (pairs_left = 1 << (dct_length_log - 1); pairs_left > 0; pairs_left--)
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{
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for ( k=0; k<CORE_SIZE; k++ )
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{
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#if PJ_HAS_INT64
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/* blp: danger danger! not really compatible but faster */
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pj_int64_t sum64=0;
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move32();
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for ( i=0; i<CORE_SIZE; i++ )
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{
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sum64 += L_mult(pair_ptr[i], dct_core_s[i][k]);
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}
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sum = L_saturate(sum64);
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#else
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sum=0L;
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move32();
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for ( i=0; i<CORE_SIZE; i++ )
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{
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sum = L_mac(sum, pair_ptr[i],dct_core_s[i][k]);
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}
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#endif
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buffer_swap[k] = itu_round(sum);
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}
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pair_ptr += CORE_SIZE;
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move16();
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buffer_swap += CORE_SIZE;
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move16();
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}
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for (i=0;i<dct_length;i++)
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{
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in_buffer[i] = buffer_c[i];
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move16();
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}
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table_ptr_ptr = s_cos_msin_table;
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move16();
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/*++++++++++++++++++++++++++++++*/
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/* Perform rotation butterflies */
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/*++++++++++++++++++++++++++++++*/
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index=0;
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move16();
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for (set_count_log = dct_length_log - 2 ; set_count_log >= 0; set_count_log--)
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{
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/*===========================================================*/
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/* Initialization for the loop over sets at the current size */
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/*===========================================================*/
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/* set_span = 1 << (DCT_LENGTH_LOG - set_count_log); */
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set_span = shr_nocheck(dct_length,set_count_log);
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set_count = shl_nocheck(1,set_count_log);
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next_in_base = in_buffer;
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move16();
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test();
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if (set_count_log == 0)
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{
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next_out_base = output;
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move16();
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}
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else
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{
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next_out_base = out_buffer;
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move16();
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}
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/*=====================================*/
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/* Loop over all the sets of this size */
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/*=====================================*/
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for (sets_left = set_count; sets_left > 0; sets_left--)
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{
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/*|||||||||||||||||||||||||||||||||||||||||*/
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/* Set up the pointers for the current set */
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/*|||||||||||||||||||||||||||||||||||||||||*/
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in_ptr_low = next_in_base;
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move16();
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temp = shr_nocheck(set_span,1);
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in_ptr_high = in_ptr_low + temp;
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move16();
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next_in_base += set_span;
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move16();
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out_ptr_low = next_out_base;
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move16();
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next_out_base += set_span;
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move16();
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out_ptr_high = next_out_base;
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move16();
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cos_msin_ptr = *table_ptr_ptr;
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move16();
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/*||||||||||||||||||||||||||||||||||||||||||||||||||||||*/
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/* Loop over all the butterfly pairs in the current set */
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/*||||||||||||||||||||||||||||||||||||||||||||||||||||||*/
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do
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{
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in_low_even = *in_ptr_low++;
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move16();
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in_low_odd = *in_ptr_low++;
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move16();
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in_high_even = *in_ptr_high++;
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move16();
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in_high_odd = *in_ptr_high++;
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move16();
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cos_even = cos_msin_ptr[0].cosine;
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move16();
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msin_even = cos_msin_ptr[0].minus_sine;
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move16();
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cos_odd = cos_msin_ptr[1].cosine;
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move16();
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msin_odd = cos_msin_ptr[1].minus_sine;
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move16();
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cos_msin_ptr += 2;
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sum = 0L;
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move32();
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sum = L_mac(sum,cos_even,in_low_even);
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sum = L_mac(sum,negate(msin_even),in_high_even);
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out_low_even = itu_round(L_shl_nocheck(sum,1));
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sum = 0L;
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move32();
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sum = L_mac(sum,msin_even,in_low_even);
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sum = L_mac(sum,cos_even,in_high_even);
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out_high_even = itu_round(L_shl_nocheck(sum,1));
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sum = 0L;
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move32();
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sum = L_mac(sum,cos_odd,in_low_odd);
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sum = L_mac(sum,msin_odd,in_high_odd);
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out_low_odd = itu_round(L_shl_nocheck(sum,1));
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sum = 0L;
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move32();
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sum = L_mac(sum,msin_odd,in_low_odd);
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sum = L_mac(sum,negate(cos_odd),in_high_odd);
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out_high_odd = itu_round(L_shl_nocheck(sum,1));
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*out_ptr_low++ = out_low_even;
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move16();
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*--out_ptr_high = out_high_even;
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move16();
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*out_ptr_low++ = out_low_odd;
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move16();
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*--out_ptr_high = out_high_odd;
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move16();
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test();
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} while (out_ptr_low < out_ptr_high);
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} /* End of loop over sets of the current size */
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/*=============================================*/
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/* Swap input and output buffers for next time */
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/*=============================================*/
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buffer_swap = in_buffer;
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move16();
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in_buffer = out_buffer;
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move16();
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out_buffer = buffer_swap;
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move16();
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index = add(index,1);
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table_ptr_ptr++;
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}
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/*------------------------------------
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ADD IN BIAS FOR OUTPUT
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-----------------------------------*/
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if (dct_length==DCT_LENGTH)
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{
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for(i=0;i<320;i++)
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{
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// blp: addition of two 16bits vars, there's no way
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// they'll overflow a 32bit var
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//sum = L_add(output[i],syn_bias_7khz[i]);
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sum = output[i] + syn_bias_7khz[i];
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acca = L_sub(sum,32767);
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test();
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if (acca > 0)
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{
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sum = 32767L;
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move32();
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}
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// blp: addition of two 16bits vars, there's no way
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// they'll overflow 32bit var
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//acca = L_add(sum,32768L);
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acca = sum + 32768;
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test();
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if (acca < 0)
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{
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sum = -32768L;
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move32();
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}
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output[i] = extract_l(sum);
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}
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}
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}
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