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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "fatfs_audio_input.hpp"
#include <stdint.h>
#include <algorithm>
#include <chrono>
#include <cstddef>
#include <cstdint>
#include <future>
#include <memory>
#include <string>
#include <variant>
#include "arena.hpp"
#include "audio_events.hpp"
#include "audio_fsm.hpp"
#include "esp_heap_caps.h"
#include "esp_log.h"
#include "event_queue.hpp"
#include "ff.h"
#include "freertos/portmacro.h"
#include "audio_element.hpp"
#include "chunk.hpp"
#include "stream_buffer.hpp"
#include "stream_event.hpp"
#include "stream_info.hpp"
#include "stream_message.hpp"
#include "tag_parser.hpp"
#include "track.hpp"
#include "types.hpp"
static const char* kTag = "SRC";
namespace audio {
FatfsAudioInput::FatfsAudioInput()
: IAudioElement(),
pending_path_(),
current_file_(),
is_file_open_(false),
has_prepared_output_(false),
current_container_(),
current_format_() {}
FatfsAudioInput::~FatfsAudioInput() {}
auto FatfsAudioInput::OpenFile(std::future<std::optional<std::string>>&& path)
-> void {
pending_path_ = std::move(path);
}
auto FatfsAudioInput::OpenFile(const std::string& path) -> bool {
current_path_.reset();
if (is_file_open_) {
f_close(¤t_file_);
is_file_open_ = false;
has_prepared_output_ = false;
}
if (pending_path_) {
pending_path_ = {};
}
ESP_LOGI(kTag, "opening file %s", path.c_str());
FILINFO info;
if (f_stat(path.c_str(), &info) != FR_OK) {
ESP_LOGE(kTag, "failed to stat file");
}
database::TagParserImpl tag_parser;
database::TrackTags tags;
if (!tag_parser.ReadAndParseTags(path, &tags)) {
ESP_LOGE(kTag, "failed to read tags");
return false;
}
auto stream_type = ContainerToStreamType(tags.encoding());
if (!stream_type.has_value()) {
ESP_LOGE(kTag, "couldn't match container to stream");
return false;
}
current_container_ = tags.encoding();
if (*stream_type == codecs::StreamType::kPcm && tags.channels &&
tags.bits_per_sample && tags.channels) {
// WAV files are a special case bc they contain raw PCM streams. These don't
// need decoding, but we *do* need to parse the PCM format from the header.
// TODO(jacqueline): Maybe we should have a decoder for this just to deal
// with endianness differences?
current_format_ = StreamInfo::Pcm{
.channels = static_cast<uint8_t>(*tags.channels),
.bits_per_sample = static_cast<uint8_t>(*tags.bits_per_sample),
.sample_rate = static_cast<uint32_t>(*tags.sample_rate),
};
} else {
current_format_ = StreamInfo::Encoded{
.type = *stream_type,
.duration_bytes = info.fsize,
};
}
FRESULT res = f_open(¤t_file_, path.c_str(), FA_READ);
if (res != FR_OK) {
ESP_LOGE(kTag, "failed to open file! res: %i", res);
return false;
}
events::Dispatch<internal::InputFileOpened, AudioState>({});
current_path_ = path;
is_file_open_ = true;
return true;
}
auto FatfsAudioInput::NeedsToProcess() const -> bool {
return is_file_open_ || pending_path_;
}
auto FatfsAudioInput::Process(const std::vector<InputStream>& inputs,
OutputStream* output) -> void {
// If the next path is being given to us asynchronously, then we need to check
// in regularly to see if it's available yet.
if (pending_path_) {
if (!pending_path_->valid()) {
pending_path_ = {};
} else {
if (pending_path_->wait_for(std::chrono::seconds(0)) ==
std::future_status::ready) {
auto result = pending_path_->get();
if (result && result != current_path_) {
OpenFile(*result);
}
pending_path_ = {};
}
}
}
if (!is_file_open_) {
return;
}
// If the output buffer isn't ready for a new stream, then we need to wait.
if (!has_prepared_output_ && !output->prepare(*current_format_)) {
return;
}
has_prepared_output_ = true;
// Performing many small reads is inefficient; it's better to do fewer, larger
// reads. Try to achieve this by only reading in new bytes if the output
// buffer has been mostly drained.
std::size_t max_size = output->data().size_bytes();
if (max_size < output->data().size_bytes() / 2) {
return;
}
std::size_t size = 0;
FRESULT result =
f_read(¤t_file_, output->data().data(), max_size, &size);
if (result != FR_OK) {
ESP_LOGE(kTag, "file I/O error %d", result);
output->mark_producer_finished();
// TODO(jacqueline): Handle errors.
return;
}
output->add(size);
if (size < max_size || f_eof(¤t_file_)) {
// HACK: In order to decode the last frame of a file, libmad requires 8
// 0-bytes ( == MAD_GUARD_BYTES) to be appended to the end of the stream.
// It would be better to do this within mad.cpp, but so far it's the only
// decoder that has such a requirement.
if (current_container_ == database::Encoding::kMp3) {
std::fill_n(output->data().begin(), 8, std::byte(0));
output->add(8);
}
f_close(¤t_file_);
is_file_open_ = false;
current_path_.reset();
has_prepared_output_ = false;
output->mark_producer_finished();
events::Dispatch<internal::InputFileClosed, AudioState>({});
}
}
auto FatfsAudioInput::ContainerToStreamType(database::Encoding enc)
-> std::optional<codecs::StreamType> {
switch (enc) {
case database::Encoding::kMp3:
return codecs::StreamType::kMp3;
case database::Encoding::kWav:
return codecs::StreamType::kPcm;
case database::Encoding::kFlac:
return codecs::StreamType::kFlac;
case database::Encoding::kOgg: // Misnamed; this is Ogg Vorbis.
return codecs::StreamType::kVorbis;
case database::Encoding::kUnsupported:
default:
return {};
}
}
} // namespace audio
|
