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#include "fatfs_audio_input.hpp<D-c>ccc
#include <cstdint>
#include <memory>
#include "chunk.hpp"
#include "fatfs_audio_input.hpp"
#include "esp_heap_caps.h"
#include "audio_element.hpp"
#include "freertos/portmacro.h"
#include "include/audio_element.hpp"
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) {
file_buffer_ = heap_caps_malloc(kMaxFrameSize, MALLOC_CAP_SPIRAM);
file_buffer_read_pos_ = file_buffer_;
file_buffer_write_pos_ = file_buffer_;
chunk_buffer_ = heap_caps_malloc(kMaxChunkSize, MALLOC_CAP_SPIRAM);
output_buffer_memory_ =
heap_caps_malloc(kOutputBufferSize, MALLOC_CAP_SPIRAM);
output_buffer_ = xMessageBufferCreateStatic(
kOutputBufferSize, output_buffer_memory_, &output_buffer_metadata_);
}
FatfsAudioInput::~FatfsAudioInput() {
free(file_buffer_);
free(chunk_buffer_);
vMessageBufferDelete(output_buffer_);
free(output_buffer_memory_);
}
auto FatfsAudioInput::InputBuffer() -> MessageBufferHandle_t {
return input_buffer_;
}
auto FatfsAudioInput::OutputBuffer() -> MessageBufferHandle_t {
return output_buffer_;
}
auto FatfsAudioInput::ProcessStreamInfo(StreamInfo& info)
-> cpp::result<void, StreamError> {
if (is_file_open_) {
f_close(¤t_file_);
is_file_open_ = false;
}
FRESULT res = f_open(¤t_file_, info.path.c_str(), FA_READ);
if (res != FR_OK) {
return cpp::fail(IO_ERROR);
}
is_file_open_ = true;
// TODO: pass on stream info.
return {};
}
auto FatfsAudioInput::ProcessChunk(uint8_t* data, std::size_t length)
-> cpp::result<void, StreamError> {
// TODO.
return {};
}
static auto 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_ + kFileBufferSize - file_buffer_read_pos_)
// Start of buffer to write position.
+ (file_buffer_write_pos_ - file_buffer_)
}
virtual auto FatfsAudioInput::ProcessIdle() -> cpp::result<void, StreamError> {
// 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 (kFileBufferSize - 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_ - file_buffer_write_pos_;
}
UINT bytes_read = 0;
FRESULT result = f_read(¤t_file_, file_buffer_write_pos_, read_size,
&bytes_read);
if (!FR_OK) {
return ERROR; // TODO;
}
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_ + kFileBufferSize) {
file_buffer_write_pos_ = file_buffer_;
}
}
}
// Now stream data into the output buffer until it's full.
pending_read_pos_ = nullptr;
EncodeWriteResult result =
WriteChunksToStream(&output_buffer_, chunk_buffer_, kMaxChunkSize,
&SendChunk, kServiceInterval);
switch (result) {
case CHUNK_WRITE_TIMEOUT:
case CHUNK_OUT_OF_DATA:
return; // TODO.
default:
return; // TODO.
}
}
auto FatfsAudioInput::SendChunk(uint8_t* buffer, size_t size) -> size_t {
if (pending_read_pos_ != nullptr) {
file_buffer_read_pos_ = pending_read_pos_;
}
if (file_buffer_read_pos_ == file_buffer_write_pos_) {
return 0;
}
std::size_t write_size;
if (file_buffer_read_pos_ > file_buffer_write_pos_) {
write_size = file_buffer_ + kFileBufferSize - file_buffer_read_pos_;
} else {
write_size = file_buffer_write_pos_ - file_buffer_read_pos_;
}
write_size = std::min(write_size, size);
memcpy(buffer, file_buffer_read_pos_, write_size);
pending_read_pos_ = file_buffer_read_pos_ + write_size;
if (pending_read_pos_ == file_buffer_ + kFileBufferSize) {
pending_read_pos_ = file_buffer_;
}
return write_size;
}
} // namespace audio
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