src/third_party/webrtc/modules/audio_coding/main/acm2/acm_resampler.cc

   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/main/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/interface/logging.h"
  18
  19 namespace webrtc {
  20 namespace acm2 {
  21
  22 ACMResampler::ACMResampler() {
  23 }
  24
  25 ACMResampler::~ACMResampler() {
  26 }
  27
  28 int ACMResampler::Resample10Msec(const int16_t* in_audio,
  29                                  int in_freq_hz,
  30                                  int out_freq_hz,
  31                                  int num_audio_channels,
  32                                  int out_capacity_samples,
  33                                  int16_t* out_audio) {
  34   int in_length = in_freq_hz * num_audio_channels / 100;
  35   int out_length = out_freq_hz * num_audio_channels / 100;
  36   if (in_freq_hz == out_freq_hz) {
  37     if (out_capacity_samples < in_length) {
  38       assert(false);
  39       return -1;
  40     }
  41     memcpy(out_audio, in_audio, in_length * sizeof(int16_t));
  42     return in_length / num_audio_channels;
  43   }
  44
  45   if (resampler_.InitializeIfNeeded(in_freq_hz, out_freq_hz,
  46                                     num_audio_channels) != 0) {
  47     LOG_FERR3(LS_ERROR, InitializeIfNeeded, in_freq_hz, out_freq_hz,
  48               num_audio_channels);
  49     return -1;
  50   }
  51
  52   out_length =
  53       resampler_.Resample(in_audio, in_length, out_audio, out_capacity_samples);
  54   if (out_length == -1) {
  55     LOG_FERR4(LS_ERROR,
  56               Resample,
  57               in_audio,
  58               in_length,
  59               out_audio,
  60               out_capacity_samples);
  61     return -1;
  62   }
  63
  64   return out_length / num_audio_channels;
  65 }
  66
  67 }  // namespace acm2
  68 }  // namespace webrtc