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