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08973eed36
WebRTC internal code should always used include paths that starts from the root of the project and that clearly identify the header file. This allows 'gn check' to actually keep dependencies under control because 'gn check' cannot enforce anything if the include path is not fully qualified (starting from the root of the project). Bug: webrtc:8815 Change-Id: I23fb4fed0c27a4d98bea360315b959af843587bc Reviewed-on: https://webrtc-review.googlesource.com/46101 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21847}
126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <math.h>
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#include "modules/audio_coding/codecs/isac/main/source/settings.h"
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#include "modules/audio_coding/codecs/isac/main/source/fft.h"
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#include "modules/audio_coding/codecs/isac/main/source/codec.h"
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#include "modules/audio_coding/codecs/isac/main/source/os_specific_inline.h"
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void WebRtcIsac_InitTransform(TransformTables* tables) {
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int k;
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double fact, phase;
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fact = PI / (FRAMESAMPLES_HALF);
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phase = 0.0;
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for (k = 0; k < FRAMESAMPLES_HALF; k++) {
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tables->costab1[k] = cos(phase);
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tables->sintab1[k] = sin(phase);
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phase += fact;
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}
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fact = PI * ((double) (FRAMESAMPLES_HALF - 1)) / ((double) FRAMESAMPLES_HALF);
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phase = 0.5 * fact;
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for (k = 0; k < FRAMESAMPLES_QUARTER; k++) {
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tables->costab2[k] = cos(phase);
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tables->sintab2[k] = sin(phase);
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phase += fact;
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}
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}
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void WebRtcIsac_Time2Spec(const TransformTables* tables,
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double* inre1,
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double* inre2,
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int16_t* outreQ7,
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int16_t* outimQ7,
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FFTstr* fftstr_obj) {
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int k;
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int dims[1];
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double tmp1r, tmp1i, xr, xi, yr, yi, fact;
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double tmpre[FRAMESAMPLES_HALF], tmpim[FRAMESAMPLES_HALF];
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dims[0] = FRAMESAMPLES_HALF;
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/* Multiply with complex exponentials and combine into one complex vector */
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fact = 0.5 / sqrt(FRAMESAMPLES_HALF);
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for (k = 0; k < FRAMESAMPLES_HALF; k++) {
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tmp1r = tables->costab1[k];
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tmp1i = tables->sintab1[k];
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tmpre[k] = (inre1[k] * tmp1r + inre2[k] * tmp1i) * fact;
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tmpim[k] = (inre2[k] * tmp1r - inre1[k] * tmp1i) * fact;
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}
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/* Get DFT */
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WebRtcIsac_Fftns(1, dims, tmpre, tmpim, -1, 1.0, fftstr_obj);
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/* Use symmetry to separate into two complex vectors and center frames in time around zero */
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for (k = 0; k < FRAMESAMPLES_QUARTER; k++) {
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xr = tmpre[k] + tmpre[FRAMESAMPLES_HALF - 1 - k];
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yi = -tmpre[k] + tmpre[FRAMESAMPLES_HALF - 1 - k];
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xi = tmpim[k] - tmpim[FRAMESAMPLES_HALF - 1 - k];
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yr = tmpim[k] + tmpim[FRAMESAMPLES_HALF - 1 - k];
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tmp1r = tables->costab2[k];
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tmp1i = tables->sintab2[k];
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outreQ7[k] = (int16_t)WebRtcIsac_lrint((xr * tmp1r - xi * tmp1i) * 128.0);
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outimQ7[k] = (int16_t)WebRtcIsac_lrint((xr * tmp1i + xi * tmp1r) * 128.0);
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outreQ7[FRAMESAMPLES_HALF - 1 - k] = (int16_t)WebRtcIsac_lrint((-yr * tmp1i - yi * tmp1r) * 128.0);
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outimQ7[FRAMESAMPLES_HALF - 1 - k] = (int16_t)WebRtcIsac_lrint((-yr * tmp1r + yi * tmp1i) * 128.0);
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}
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}
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void WebRtcIsac_Spec2time(const TransformTables* tables,
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double* inre,
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double* inim,
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double* outre1,
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double* outre2,
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FFTstr* fftstr_obj) {
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int k;
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double tmp1r, tmp1i, xr, xi, yr, yi, fact;
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int dims;
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dims = FRAMESAMPLES_HALF;
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for (k = 0; k < FRAMESAMPLES_QUARTER; k++) {
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/* Move zero in time to beginning of frames */
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tmp1r = tables->costab2[k];
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tmp1i = tables->sintab2[k];
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xr = inre[k] * tmp1r + inim[k] * tmp1i;
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xi = inim[k] * tmp1r - inre[k] * tmp1i;
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yr = -inim[FRAMESAMPLES_HALF - 1 - k] * tmp1r - inre[FRAMESAMPLES_HALF - 1 - k] * tmp1i;
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yi = -inre[FRAMESAMPLES_HALF - 1 - k] * tmp1r + inim[FRAMESAMPLES_HALF - 1 - k] * tmp1i;
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/* Combine into one vector, z = x + j * y */
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outre1[k] = xr - yi;
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outre1[FRAMESAMPLES_HALF - 1 - k] = xr + yi;
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outre2[k] = xi + yr;
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outre2[FRAMESAMPLES_HALF - 1 - k] = -xi + yr;
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}
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/* Get IDFT */
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WebRtcIsac_Fftns(1, &dims, outre1, outre2, 1, FRAMESAMPLES_HALF, fftstr_obj);
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/* Demodulate and separate */
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fact = sqrt(FRAMESAMPLES_HALF);
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for (k = 0; k < FRAMESAMPLES_HALF; k++) {
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tmp1r = tables->costab1[k];
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tmp1i = tables->sintab1[k];
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xr = (outre1[k] * tmp1r - outre2[k] * tmp1i) * fact;
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outre2[k] = (outre2[k] * tmp1r + outre1[k] * tmp1i) * fact;
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outre1[k] = xr;
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}
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}
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