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/modules/audio_coding/acm2/acm_resampler.h"
      12             : 
      13             : #include <assert.h>
      14             : #include <string.h>
      15             : 
      16             : #include "webrtc/common_audio/resampler/include/resampler.h"
      17             : #include "webrtc/system_wrappers/include/logging.h"
      18             : 
      19             : namespace webrtc {
      20             : namespace acm2 {
      21             : 
      22           0 : ACMResampler::ACMResampler() {
      23           0 : }
      24             : 
      25           0 : ACMResampler::~ACMResampler() {
      26           0 : }
      27             : 
      28           0 : int ACMResampler::Resample10Msec(const int16_t* in_audio,
      29             :                                  int in_freq_hz,
      30             :                                  int out_freq_hz,
      31             :                                  size_t num_audio_channels,
      32             :                                  size_t out_capacity_samples,
      33             :                                  int16_t* out_audio) {
      34           0 :   size_t in_length = in_freq_hz * num_audio_channels / 100;
      35           0 :   if (in_freq_hz == out_freq_hz) {
      36           0 :     if (out_capacity_samples < in_length) {
      37           0 :       assert(false);
      38             :       return -1;
      39             :     }
      40           0 :     memcpy(out_audio, in_audio, in_length * sizeof(int16_t));
      41           0 :     return static_cast<int>(in_length / num_audio_channels);
      42             :   }
      43             : 
      44           0 :   if (resampler_.InitializeIfNeeded(in_freq_hz, out_freq_hz,
      45             :                                     num_audio_channels) != 0) {
      46           0 :     LOG(LS_ERROR) << "InitializeIfNeeded(" << in_freq_hz << ", " << out_freq_hz
      47           0 :                   << ", " << num_audio_channels << ") failed.";
      48           0 :     return -1;
      49             :   }
      50             : 
      51             :   int out_length =
      52           0 :       resampler_.Resample(in_audio, in_length, out_audio, out_capacity_samples);
      53           0 :   if (out_length == -1) {
      54           0 :     LOG(LS_ERROR) << "Resample(" << in_audio << ", " << in_length << ", "
      55           0 :                   << out_audio << ", " << out_capacity_samples << ") failed.";
      56           0 :     return -1;
      57             :   }
      58             : 
      59           0 :   return static_cast<int>(out_length / num_audio_channels);
      60             : }
      61             : 
      62             : }  // namespace acm2
      63             : }  // namespace webrtc