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/*
* Copyright (c) 2012 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.
*/
#include "common_audio/signal_processing/include/signal_processing_library.h"
#include "modules/audio_coding/codecs/isac/fix/source/pitch_estimator.h"
/* Filter coefficicients in Q15. */
static const WebRtc_Word16 kDampFilter[PITCH_DAMPORDER] = {
-2294, 8192, 20972, 8192, -2294
};
void WebRtcIsacfix_PitchFilterCore(int loopNumber,
WebRtc_Word16 gain,
int index,
WebRtc_Word16 sign,
WebRtc_Word16* inputState,
WebRtc_Word16* outputBuf2,
const WebRtc_Word16* coefficient,
WebRtc_Word16* inputBuf,
WebRtc_Word16* outputBuf,
int* index2) {
int i = 0, j = 0; /* Loop counters. */
WebRtc_Word16* ubufQQpos2 = &outputBuf2[PITCH_BUFFSIZE - (index + 2)];
WebRtc_Word16 tmpW16 = 0;
for (i = 0; i < loopNumber; i++) {
WebRtc_Word32 tmpW32 = 0;
/* Filter to get fractional pitch. */
for (j = 0; j < PITCH_FRACORDER; j++) {
tmpW32 += WEBRTC_SPL_MUL_16_16(ubufQQpos2[*index2 + j], coefficient[j]);
}
/* Saturate to avoid overflow in tmpW16. */
tmpW32 = WEBRTC_SPL_SAT(536862719, tmpW32, -536879104);
tmpW32 += 8192;
tmpW16 = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(tmpW32, 14);
/* Shift low pass filter state. */
memmove(&inputState[1], &inputState[0],
(PITCH_DAMPORDER - 1) * sizeof(WebRtc_Word16));
inputState[0] = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT_WITH_ROUND(
gain, tmpW16, 12);
/* Low pass filter. */
tmpW32 = 0;
/* TODO(kma): Define a static inline function WebRtcSpl_DotProduct()
in spl_inl.h to replace this and other similar loops. */
for (j = 0; j < PITCH_DAMPORDER; j++) {
tmpW32 += WEBRTC_SPL_MUL_16_16(inputState[j], kDampFilter[j]);
}
/* Saturate to avoid overflow in tmpW16. */
tmpW32 = WEBRTC_SPL_SAT(1073725439, tmpW32, -1073758208);
tmpW32 += 16384;
tmpW16 = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(tmpW32, 15);
/* Subtract from input and update buffer. */
tmpW32 = inputBuf[*index2] - WEBRTC_SPL_MUL_16_16(sign, tmpW16);
outputBuf[*index2] = WebRtcSpl_SatW32ToW16(tmpW32);
tmpW32 = inputBuf[*index2] + outputBuf[*index2];
outputBuf2[*index2 + PITCH_BUFFSIZE] = WebRtcSpl_SatW32ToW16(tmpW32);
(*index2)++;
}
}
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