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https://github.com/mollyim/webrtc.git
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a12c42a6b2
Usage replaced with stdint.h, rtc_base/system/arch.h and rtc_base/system/unused.h, as appropriate. Bug: webrtc:6854 Change-Id: I97225465d14b969903d92979e2df3c3c05d35f18 Reviewed-on: https://webrtc-review.googlesource.com/90249 Reviewed-by: Niklas Enbom <niklas.enbom@webrtc.org> Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24100}
48 lines
1.7 KiB
C
48 lines
1.7 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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/*
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* Contains the core loop function for the lattice filter AR routine
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* for iSAC codec.
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*
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*/
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "modules/audio_coding/codecs/isac/fix/source/settings.h"
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/* Filter ar_g_Q0[] and ar_f_Q0[] through an AR filter with coefficients
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* cth_Q15[] and sth_Q15[].
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*/
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void WebRtcIsacfix_FilterArLoop(int16_t* ar_g_Q0, // Input samples
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int16_t* ar_f_Q0, // Input samples
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int16_t* cth_Q15, // Filter coefficients
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int16_t* sth_Q15, // Filter coefficients
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size_t order_coef) { // order of the filter
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int n = 0;
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for (n = 0; n < HALF_SUBFRAMELEN - 1; n++) {
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size_t k = 0;
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int16_t tmpAR = 0;
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int32_t tmp32 = 0;
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int32_t tmp32_2 = 0;
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tmpAR = ar_f_Q0[n + 1];
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for (k = order_coef; k > 0; k--) {
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tmp32 = (cth_Q15[k - 1] * tmpAR - sth_Q15[k - 1] * ar_g_Q0[k - 1] +
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16384) >> 15;
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tmp32_2 = (sth_Q15[k - 1] * tmpAR + cth_Q15[k - 1] * ar_g_Q0[k - 1] +
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16384) >> 15;
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tmpAR = (int16_t)WebRtcSpl_SatW32ToW16(tmp32);
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ar_g_Q0[k] = (int16_t)WebRtcSpl_SatW32ToW16(tmp32_2);
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}
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ar_f_Q0[n + 1] = tmpAR;
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ar_g_Q0[0] = tmpAR;
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}
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}
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