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
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,size_t 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 size_t num_audio_channels,
32 size_t out_capacity_samples,
33 int16_t* out_audio) {
34 size_t in_length = in_freq_hz * num_audio_channels / 100;
35 if (in_freq_hz == out_freq_hz) {
36 if (out_capacity_samples < in_length) {
37 assert(false);
38 return -1;
39 }
40 memcpy(out_audio, in_audio, in_length * sizeof(int16_t));
41 return static_cast<int>(in_length / num_audio_channels);
42 }
43
44 if (resampler_.InitializeIfNeeded(in_freq_hz, out_freq_hz,
45 num_audio_channels) != 0) {
46 LOG(LS_ERROR) << "InitializeIfNeeded(" << in_freq_hz << ", " << out_freq_hz
47 << ", " << num_audio_channels << ") failed.";
48 return -1;
49 }
50
51 int out_length =
52 resampler_.Resample(in_audio, in_length, out_audio, out_capacity_samples);
53 if (out_length == -1) {
54 LOG(LS_ERROR) << "Resample(" << in_audio << ", " << in_length << ", "
55 << out_audio << ", " << out_capacity_samples << ") failed.";
56 return -1;
57 }
58
59 return static_cast<int>(out_length / num_audio_channels);
60 }
61
62 } // namespace acm2
63 } // namespace webrtc
64