| /* |
| * 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 "webrtc/base/checks.h" |
| #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" |
| |
| // TODO(bjornv): Change the return type to report errors. |
| |
| void WebRtcSpl_FilterARFastQ12(const int16_t* data_in, |
| int16_t* data_out, |
| const int16_t* __restrict coefficients, |
| size_t coefficients_length, |
| size_t data_length) { |
| size_t i = 0; |
| size_t j = 0; |
| |
| RTC_DCHECK_GT(data_length, 0); |
| RTC_DCHECK_GT(coefficients_length, 1); |
| |
| for (i = 0; i < data_length; i++) { |
| int32_t output = 0; |
| int32_t sum = 0; |
| |
| for (j = coefficients_length - 1; j > 0; j--) { |
| sum += coefficients[j] * data_out[i - j]; |
| } |
| |
| output = coefficients[0] * data_in[i]; |
| output -= sum; |
| |
| // Saturate and store the output. |
| output = WEBRTC_SPL_SAT(134215679, output, -134217728); |
| data_out[i] = (int16_t)((output + 2048) >> 12); |
| } |
| } |