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#include "fatfs_audio_input.hpp"
#include <cstdint>
#include <memory>
#include <string>
#include "audio_element.hpp"
#include "esp_heap_caps.h"
#include "freertos/portmacro.h"
#include "audio_element.hpp"
#include "chunk.hpp"
#include "stream_message.hpp"
static const char* kTag = "SRC";
namespace audio {
static const TickType_t kServiceInterval = pdMS_TO_TICKS(50);
static const std::size_t kFileBufferSize = 1024 * 128;
static const std::size_t kMinFileReadSize = 1024 * 4;
static const std::size_t kOutputBufferSize = 1024 * 4;
FatfsAudioInput::FatfsAudioInput(std::shared_ptr<drivers::SdStorage> storage)
: IAudioElement(),
storage_(storage),
raw_file_buffer_(static_cast<std::byte*>(
heap_caps_malloc(kFileBufferSize, MALLOC_CAP_SPIRAM))),
file_buffer_(raw_file_buffer_, kFileBufferSize),
file_buffer_read_pos_(file_buffer_.begin()),
file_buffer_write_pos_(file_buffer_.begin()),
raw_chunk_buffer_(static_cast<std::byte*>(
heap_caps_malloc(kMaxChunkSize, MALLOC_CAP_SPIRAM))),
chunk_buffer_(raw_chunk_buffer_, kMaxChunkSize),
current_file_(),
is_file_open_(false),
output_buffer_memory_(static_cast<uint8_t*>(
heap_caps_malloc(kOutputBufferSize, MALLOC_CAP_SPIRAM))) {
output_buffer_ = new MessageBufferHandle_t;
*output_buffer_ = xMessageBufferCreateStatic(
kOutputBufferSize, output_buffer_memory_, &output_buffer_metadata_);
}
FatfsAudioInput::~FatfsAudioInput() {
free(raw_file_buffer_);
free(raw_chunk_buffer_);
vMessageBufferDelete(output_buffer_);
free(output_buffer_memory_);
free(output_buffer_);
}
auto FatfsAudioInput::ProcessStreamInfo(StreamInfo& info)
-> cpp::result<void, AudioProcessingError> {
if (is_file_open_) {
f_close(¤t_file_);
is_file_open_ = false;
}
if (!info.Path()) {
return cpp::fail(UNSUPPORTED_STREAM);
}
std::string path = info.Path().value();
FRESULT res = f_open(¤t_file_, path.c_str(), FA_READ);
if (res != FR_OK) {
return cpp::fail(IO_ERROR);
}
is_file_open_ = true;
auto write_size =
WriteMessage(TYPE_STREAM_INFO,
std::bind(&StreamInfo::Encode, info, std::placeholders::_1),
chunk_buffer_);
if (write_size.has_error()) {
return cpp::fail(IO_ERROR);
} else {
xMessageBufferSend(output_buffer_, chunk_buffer_.data(), write_size.value(),
portMAX_DELAY);
}
return {};
}
auto FatfsAudioInput::ProcessChunk(cpp::span<std::byte>& chunk)
-> cpp::result<size_t, AudioProcessingError> {
return cpp::fail(UNSUPPORTED_STREAM);
}
auto FatfsAudioInput::GetRingBufferDistance() -> size_t {
if (file_buffer_read_pos_ == file_buffer_write_pos_) {
return 0;
}
if (file_buffer_read_pos_ < file_buffer_write_pos_) {
return file_buffer_write_pos_ - file_buffer_read_pos_;
}
return
// Read position to end of buffer.
(file_buffer_.end() - file_buffer_read_pos_)
// Start of buffer to write position.
+ (file_buffer_write_pos_ - file_buffer_.begin());
}
auto FatfsAudioInput::ProcessIdle() -> cpp::result<void, AudioProcessingError> {
// First, see if we're able to fill up the input buffer with any more of the
// file's contents.
if (is_file_open_) {
size_t ringbuf_distance = GetRingBufferDistance();
if (file_buffer_.size() - ringbuf_distance > kMinFileReadSize) {
size_t read_size;
if (file_buffer_write_pos_ < file_buffer_read_pos_) {
// Don't worry about the start of buffer -> read pos size; we can get to
// it next iteration.
read_size = file_buffer_read_pos_ - file_buffer_write_pos_;
} else {
read_size = file_buffer_.begin() - file_buffer_write_pos_;
}
UINT bytes_read = 0;
FRESULT result =
f_read(¤t_file_, std::addressof(file_buffer_write_pos_),
read_size, &bytes_read);
if (result != FR_OK) {
ESP_LOGE(kTag, "file I/O error %d", result);
return cpp::fail(IO_ERROR);
}
if (f_eof(¤t_file_)) {
f_close(¤t_file_);
is_file_open_ = false;
// TODO: open the next file?
}
file_buffer_write_pos_ += bytes_read;
if (file_buffer_write_pos_ == file_buffer_.end()) {
file_buffer_write_pos_ = file_buffer_.begin();
}
}
}
// Now stream data into the output buffer until it's full.
pending_read_pos_ = file_buffer_read_pos_;
ChunkWriteResult result = WriteChunksToStream(
output_buffer_, chunk_buffer_,
[&](cpp::span<std::byte> d) { return SendChunk(d); }, kServiceInterval);
switch (result) {
case CHUNK_WRITE_TIMEOUT:
case CHUNK_OUT_OF_DATA:
// Both of these are fine; SendChunk keeps track of where it's up to
// internally, so we will pick back up where we left off.
return {};
default:
return cpp::fail(IO_ERROR);
}
}
auto FatfsAudioInput::SendChunk(cpp::span<std::byte> dest) -> size_t {
file_buffer_read_pos_ = pending_read_pos_;
if (file_buffer_read_pos_ == file_buffer_write_pos_) {
return 0;
}
std::size_t chunk_size;
if (file_buffer_read_pos_ > file_buffer_write_pos_) {
chunk_size = file_buffer_.end() - file_buffer_read_pos_;
} else {
chunk_size = file_buffer_write_pos_ - file_buffer_read_pos_;
}
chunk_size = std::min(chunk_size, dest.size());
cpp::span<std::byte> source(file_buffer_read_pos_, chunk_size);
std::copy(source.begin(), source.end(), dest.begin());
pending_read_pos_ = file_buffer_read_pos_ + chunk_size;
if (pending_read_pos_ == file_buffer_.end()) {
pending_read_pos_ = file_buffer_.begin();
}
return chunk_size;
}
} // namespace audio
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