diff options
Diffstat (limited to 'src/common_audio/signal_processing_library/main/source/complex_ifft.c')
| -rw-r--r-- | src/common_audio/signal_processing_library/main/source/complex_ifft.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/src/common_audio/signal_processing_library/main/source/complex_ifft.c b/src/common_audio/signal_processing_library/main/source/complex_ifft.c deleted file mode 100644 index 184b8de5be..0000000000 --- a/src/common_audio/signal_processing_library/main/source/complex_ifft.c +++ /dev/null @@ -1,155 +0,0 @@ -/* - * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE file in the root of the source - * tree. An additional intellectual property rights grant can be found - * in the file PATENTS. All contributing project authors may - * be found in the AUTHORS file in the root of the source tree. - */ - - -/* - * This file contains the function WebRtcSpl_ComplexIFFT(). - * The description header can be found in signal_processing_library.h - * - */ - -#include "signal_processing_library.h" - -#define CIFFTSFT 14 -#define CIFFTRND 1 - -#if (defined ARM9E_GCC) || (defined ARM_WINM) || (defined ANDROID_AECOPT) -extern "C" int FFT_4OIQ14(void *src, void *dest, int NC, int shift); - -// For detailed description of the fft functions, check the readme files in fft_ARM9E folder. -int WebRtcSpl_ComplexIFFT2(WebRtc_Word16 frfi[], WebRtc_Word16 frfiOut[], int stages, int mode) -{ - FFT_4OIQ14(frfi, frfiOut, 1 << stages, 0); - return 0; -} -#endif - -int WebRtcSpl_ComplexIFFT(WebRtc_Word16 frfi[], int stages, int mode) -{ - int i, j, l, k, istep, n, m, scale, shift; - WebRtc_Word16 wr, wi; - WebRtc_Word32 tr32, ti32, qr32, qi32; - WebRtc_Word32 tmp32, round2; - - /* The 1024-value is a constant given from the size of WebRtcSpl_kSinTable1024[], - * and should not be changed depending on the input parameter 'stages' - */ - n = 1 << stages; - if (n > 1024) - return -1; - - scale = 0; - - l = 1; - k = 10 - 1; /* Constant for given WebRtcSpl_kSinTable1024[]. Do not change - depending on the input parameter 'stages' */ - - while (l < n) - { - // variable scaling, depending upon data - shift = 0; - round2 = 8192; - - tmp32 = (WebRtc_Word32)WebRtcSpl_MaxAbsValueW16(frfi, 2 * n); - if (tmp32 > 13573) - { - shift++; - scale++; - round2 <<= 1; - } - if (tmp32 > 27146) - { - shift++; - scale++; - round2 <<= 1; - } - - istep = l << 1; - - if (mode == 0) - { - // mode==0: Low-complexity and Low-accuracy mode - for (m = 0; m < l; ++m) - { - j = m << k; - - /* The 256-value is a constant given as 1/4 of the size of - * WebRtcSpl_kSinTable1024[], and should not be changed depending on the input - * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2 - */ - wr = WebRtcSpl_kSinTable1024[j + 256]; - wi = WebRtcSpl_kSinTable1024[j]; - - for (i = m; i < n; i += istep) - { - j = i + l; - - tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j], 0) - - WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j + 1], 0)), 15); - - ti32 = WEBRTC_SPL_RSHIFT_W32( - (WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j + 1], 0) - + WEBRTC_SPL_MUL_16_16_RSFT(wi,frfi[2*j],0)), 15); - - qr32 = (WebRtc_Word32)frfi[2 * i]; - qi32 = (WebRtc_Word32)frfi[2 * i + 1]; - frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 - tr32, shift); - frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 - ti32, shift); - frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 + tr32, shift); - frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 + ti32, shift); - } - } - } else - { - // mode==1: High-complexity and High-accuracy mode - - for (m = 0; m < l; ++m) - { - j = m << k; - - /* The 256-value is a constant given as 1/4 of the size of - * WebRtcSpl_kSinTable1024[], and should not be changed depending on the input - * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2 - */ - wr = WebRtcSpl_kSinTable1024[j + 256]; - wi = WebRtcSpl_kSinTable1024[j]; - - for (i = m; i < n; i += istep) - { - j = i + l; - - tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j], 0) - - WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j + 1], 0) + CIFFTRND), - 15 - CIFFTSFT); - - ti32 = WEBRTC_SPL_RSHIFT_W32( - (WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j + 1], 0) - + WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j], 0) - + CIFFTRND), 15 - CIFFTSFT); - - qr32 = ((WebRtc_Word32)frfi[2 * i]) << CIFFTSFT; - qi32 = ((WebRtc_Word32)frfi[2 * i + 1]) << CIFFTSFT; - frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32((qr32 - tr32+round2), - shift+CIFFTSFT); - frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32( - (qi32 - ti32 + round2), shift + CIFFTSFT); - frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32((qr32 + tr32 + round2), - shift + CIFFTSFT); - frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32( - (qi32 + ti32 + round2), shift + CIFFTSFT); - } - } - - } - --k; - l = istep; - } - return scale; -} |