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fixed_dsp.c
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1 /*
2  * Copyright (c) 2012
3  * MIPS Technologies, Inc., California.
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15  * this software without specific prior written permission.
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28  *
29  * Author: Nedeljko Babic (nbabic@mips.com)
30  *
31  * This file is part of FFmpeg.
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33  * FFmpeg is free software; you can redistribute it and/or
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47 
48 #include "fixed_dsp.h"
49 
50 static void vector_fmul_window_fixed_scaled_c(int16_t *dst, const int32_t *src0,
51  const int32_t *src1, const int32_t *win,
52  int len, uint8_t bits)
53 {
54  int32_t s0, s1, wi, wj, i,j, round;
55 
56  dst += len;
57  win += len;
58  src0+= len;
59  round = bits? 1 << (bits-1) : 0;
60 
61  for (i=-len, j=len-1; i<0; i++, j--) {
62  s0 = src0[i];
63  s1 = src1[j];
64  wi = win[i];
65  wj = win[j];
66  dst[i] = av_clip_int16(((((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31) + round) >> bits);
67  dst[j] = av_clip_int16(((((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31) + round) >> bits);
68  }
69 }
70 
71 static void vector_fmul_window_fixed_c(int32_t *dst, const int32_t *src0,
72  const int32_t *src1, const int32_t *win,
73  int len)
74 {
75  int32_t s0, s1, wi, wj, i, j;
76 
77  dst += len;
78  win += len;
79  src0+= len;
80 
81  for (i=-len, j=len-1; i<0; i++, j--) {
82  s0 = src0[i];
83  s1 = src1[j];
84  wi = win[i];
85  wj = win[j];
86  dst[i] = ((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31;
87  dst[j] = ((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31;
88  }
89 }
90 
92 {
94 
95  if (!fdsp)
96  return NULL;
97 
100 
101  return fdsp;
102 }