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#include "chunk.hpp"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <optional>
#include "cbor.h"
#include "esp_log.h"
#include "stream_buffer.hpp"
#include "stream_message.hpp"
namespace audio {
ChunkReader::ChunkReader(std::size_t chunk_size)
: raw_working_buffer_(static_cast<std::byte*>(
heap_caps_malloc(chunk_size * 1.5, MALLOC_CAP_SPIRAM))),
working_buffer_(raw_working_buffer_, chunk_size * 1.5) {}
ChunkReader::~ChunkReader() {
free(raw_working_buffer_);
}
auto ChunkReader::HandleNewData(cpp::span<std::byte> data)
-> cpp::span<std::byte> {
// Copy the new data onto the front for anything that was left over from the
// last portion. Note: this could be optimised for the '0 leftover bytes'
// case, which technically shouldn't need a copy.
cpp::span<std::byte> new_data_dest = working_buffer_.subspan(leftover_bytes_);
std::copy(data.begin(), data.end(), new_data_dest.begin());
last_data_in_working_buffer_ =
working_buffer_.first(leftover_bytes_ + data.size());
leftover_bytes_ = 0;
return last_data_in_working_buffer_;
}
auto ChunkReader::HandleLeftovers(std::size_t bytes_used) -> void {
leftover_bytes_ = last_data_in_working_buffer_.size() - bytes_used;
if (leftover_bytes_ > 0) {
auto data_to_keep = last_data_in_working_buffer_.last(leftover_bytes_);
// Copy backwards, since if more than half of the data was unused then the
// source and destination will overlap.
std::copy_backward(data_to_keep.begin(), data_to_keep.end(),
working_buffer_.begin());
}
}
} // namespace audio
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