Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #include "webrtc/base/checks.h"
      12             : #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
      13             : 
      14             : // TODO(bjornv): Change the return type to report errors.
      15             : 
      16           0 : void WebRtcSpl_FilterARFastQ12(const int16_t* data_in,
      17             :                                int16_t* data_out,
      18             :                                const int16_t* __restrict coefficients,
      19             :                                size_t coefficients_length,
      20             :                                size_t data_length) {
      21           0 :   size_t i = 0;
      22           0 :   size_t j = 0;
      23             : 
      24           0 :   RTC_DCHECK_GT(data_length, 0);
      25           0 :   RTC_DCHECK_GT(coefficients_length, 1);
      26             : 
      27           0 :   for (i = 0; i < data_length; i++) {
      28           0 :     int32_t output = 0;
      29           0 :     int32_t sum = 0;
      30             : 
      31           0 :     for (j = coefficients_length - 1; j > 0; j--) {
      32           0 :       sum += coefficients[j] * data_out[i - j];
      33             :     }
      34             : 
      35           0 :     output = coefficients[0] * data_in[i];
      36           0 :     output -= sum;
      37             : 
      38             :     // Saturate and store the output.
      39           0 :     output = WEBRTC_SPL_SAT(134215679, output, -134217728);
      40           0 :     data_out[i] = (int16_t)((output + 2048) >> 12);
      41             :   }
      42           0 : }