1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "resample.hpp"
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <numeric>
#include "esp_log.h"
#include "speex/speex_resampler.h"
#include "sample.hpp"
namespace audio {
static constexpr int kQuality = SPEEX_RESAMPLER_QUALITY_MIN;
Resampler::Resampler(uint32_t source_sample_rate,
uint32_t target_sample_rate,
uint8_t num_channels)
: err_(0),
resampler_(speex_resampler_init(num_channels,
source_sample_rate,
target_sample_rate,
kQuality,
&err_)),
num_channels_(num_channels) {
assert(err_ == 0);
}
Resampler::~Resampler() {
speex_resampler_destroy(resampler_);
}
auto Resampler::Process(cpp::span<sample::Sample> input,
cpp::span<sample::Sample> output,
bool end_of_data) -> std::pair<size_t, size_t> {
uint32_t samples_used = input.size() / num_channels_;
uint32_t samples_produced = output.size() / num_channels_;
int err = speex_resampler_process_interleaved_int(
resampler_, input.data(), &samples_used, output.data(),
&samples_produced);
assert(err == 0);
return {samples_used * num_channels_, samples_produced * num_channels_};
}
} // namespace audio
|
