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/*
* 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 <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),
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 {
if (is_file_open_) {
f_close(¤t_file_);
is_file_open_ = false;
}
if (pending_path_) {
pending_path_ = {};
}
ESP_LOGI(kTag, "opening file %s", path.c_str());
database::TagParserImpl tag_parser;
database::TrackTags tags;
if (!tag_parser.ReadAndParseTags(path, &tags)) {
ESP_LOGE(kTag, "failed to read tags");
tags.encoding = database::Encoding::kFlac;
// 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{*stream_type};
}
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<InputFileOpened, AudioState>({});
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 (pending_path_) {
ESP_LOGI(kTag, "waiting for path");
if (!pending_path_->valid()) {
pending_path_ = {};
} else {
if (pending_path_->wait_for(std::chrono::seconds(0)) ==
std::future_status::ready) {
ESP_LOGI(kTag, "path ready!");
auto result = pending_path_->get();
if (result) {
OpenFile(*result);
}
}
}
}
if (!is_file_open_) {
return;
}
if (!output->prepare(*current_format_)) {
return;
}
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);
// TODO(jacqueline): Handle errors.
return;
}
output->add(size);
if (size < max_size || f_eof(¤t_file_)) {
f_close(¤t_file_);
is_file_open_ = false;
// HACK: libmad requires an 8 byte padding at the end of each file.
if (current_container_ == database::Encoding::kMp3) {
std::fill_n(output->data().begin(), 8, std::byte(0));
output->add(8);
}
events::Dispatch<InputFileFinished, 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
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