| /* |
| * 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. |
| */ |
| |
| |
| /* |
| * This file contains implementations of the functions |
| * WebRtcSpl_VectorBitShiftW16() |
| * WebRtcSpl_VectorBitShiftW32() |
| * WebRtcSpl_VectorBitShiftW32ToW16() |
| * WebRtcSpl_ScaleVector() |
| * WebRtcSpl_ScaleVectorWithSat() |
| * WebRtcSpl_ScaleAndAddVectors() |
| * WebRtcSpl_ScaleAndAddVectorsWithRoundC() |
| */ |
| |
| #include "signal_processing_library.h" |
| |
| void WebRtcSpl_VectorBitShiftW16(WebRtc_Word16 *res, |
| WebRtc_Word16 length, |
| G_CONST WebRtc_Word16 *in, |
| WebRtc_Word16 right_shifts) |
| { |
| int i; |
| |
| if (right_shifts > 0) |
| { |
| for (i = length; i > 0; i--) |
| { |
| (*res++) = ((*in++) >> right_shifts); |
| } |
| } else |
| { |
| for (i = length; i > 0; i--) |
| { |
| (*res++) = ((*in++) << (-right_shifts)); |
| } |
| } |
| } |
| |
| void WebRtcSpl_VectorBitShiftW32(WebRtc_Word32 *out_vector, |
| WebRtc_Word16 vector_length, |
| G_CONST WebRtc_Word32 *in_vector, |
| WebRtc_Word16 right_shifts) |
| { |
| int i; |
| |
| if (right_shifts > 0) |
| { |
| for (i = vector_length; i > 0; i--) |
| { |
| (*out_vector++) = ((*in_vector++) >> right_shifts); |
| } |
| } else |
| { |
| for (i = vector_length; i > 0; i--) |
| { |
| (*out_vector++) = ((*in_vector++) << (-right_shifts)); |
| } |
| } |
| } |
| |
| void WebRtcSpl_VectorBitShiftW32ToW16(WebRtc_Word16 *res, |
| WebRtc_Word16 length, |
| G_CONST WebRtc_Word32 *in, |
| WebRtc_Word16 right_shifts) |
| { |
| int i; |
| |
| if (right_shifts >= 0) |
| { |
| for (i = length; i > 0; i--) |
| { |
| (*res++) = (WebRtc_Word16)((*in++) >> right_shifts); |
| } |
| } else |
| { |
| WebRtc_Word16 left_shifts = -right_shifts; |
| for (i = length; i > 0; i--) |
| { |
| (*res++) = (WebRtc_Word16)((*in++) << left_shifts); |
| } |
| } |
| } |
| |
| void WebRtcSpl_ScaleVector(G_CONST WebRtc_Word16 *in_vector, WebRtc_Word16 *out_vector, |
| WebRtc_Word16 gain, WebRtc_Word16 in_vector_length, |
| WebRtc_Word16 right_shifts) |
| { |
| // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts |
| int i; |
| G_CONST WebRtc_Word16 *inptr; |
| WebRtc_Word16 *outptr; |
| |
| inptr = in_vector; |
| outptr = out_vector; |
| |
| for (i = 0; i < in_vector_length; i++) |
| { |
| (*outptr++) = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(*inptr++, gain, right_shifts); |
| } |
| } |
| |
| void WebRtcSpl_ScaleVectorWithSat(G_CONST WebRtc_Word16 *in_vector, WebRtc_Word16 *out_vector, |
| WebRtc_Word16 gain, WebRtc_Word16 in_vector_length, |
| WebRtc_Word16 right_shifts) |
| { |
| // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts |
| int i; |
| WebRtc_Word32 tmpW32; |
| G_CONST WebRtc_Word16 *inptr; |
| WebRtc_Word16 *outptr; |
| |
| inptr = in_vector; |
| outptr = out_vector; |
| |
| for (i = 0; i < in_vector_length; i++) |
| { |
| tmpW32 = WEBRTC_SPL_MUL_16_16_RSFT(*inptr++, gain, right_shifts); |
| (*outptr++) = WebRtcSpl_SatW32ToW16(tmpW32); |
| } |
| } |
| |
| void WebRtcSpl_ScaleAndAddVectors(G_CONST WebRtc_Word16 *in1, WebRtc_Word16 gain1, int shift1, |
| G_CONST WebRtc_Word16 *in2, WebRtc_Word16 gain2, int shift2, |
| WebRtc_Word16 *out, int vector_length) |
| { |
| // Performs vector operation: out = (gain1*in1)>>shift1 + (gain2*in2)>>shift2 |
| int i; |
| G_CONST WebRtc_Word16 *in1ptr; |
| G_CONST WebRtc_Word16 *in2ptr; |
| WebRtc_Word16 *outptr; |
| |
| in1ptr = in1; |
| in2ptr = in2; |
| outptr = out; |
| |
| for (i = 0; i < vector_length; i++) |
| { |
| (*outptr++) = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(gain1, *in1ptr++, shift1) |
| + (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(gain2, *in2ptr++, shift2); |
| } |
| } |
| |
| // C version of WebRtcSpl_ScaleAndAddVectorsWithRound() for generic platforms. |
| int WebRtcSpl_ScaleAndAddVectorsWithRoundC(const int16_t* in_vector1, |
| int16_t in_vector1_scale, |
| const int16_t* in_vector2, |
| int16_t in_vector2_scale, |
| int right_shifts, |
| int16_t* out_vector, |
| int length) { |
| int i = 0; |
| int round_value = (1 << right_shifts) >> 1; |
| |
| if (in_vector1 == NULL || in_vector2 == NULL || out_vector == NULL || |
| length <= 0 || right_shifts < 0) { |
| return -1; |
| } |
| |
| for (i = 0; i < length; i++) { |
| out_vector[i] = (int16_t)(( |
| WEBRTC_SPL_MUL_16_16(in_vector1[i], in_vector1_scale) |
| + WEBRTC_SPL_MUL_16_16(in_vector2[i], in_vector2_scale) |
| + round_value) >> right_shifts); |
| } |
| |
| return 0; |
| } |