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/include/logging.h"
18
19 namespace webrtc {
20 namespace acm2 {
21
ACMResampler()22 ACMResampler::ACMResampler() {
23 }
24
~ACMResampler()25 ACMResampler::~ACMResampler() {
26 }
27
Resample10Msec(const int16_t * in_audio,int in_freq_hz,int out_freq_hz,int num_audio_channels,size_t out_capacity_samples,int16_t * out_audio)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 size_t out_capacity_samples,
33 int16_t* out_audio) {
34 size_t in_length = static_cast<size_t>(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 static_cast<int>(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
69