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71 lines
2.2 KiB
71 lines
2.2 KiB
/*
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* Copyright 2023 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#include "chunk.hpp"
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#include <algorithm>
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <optional>
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#include "cbor.h"
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#include "esp_log.h"
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#include "stream_buffer.hpp"
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#include "stream_message.hpp"
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namespace audio {
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static const std::size_t kWorkingBufferMultiple = 2;
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ChunkReader::ChunkReader(std::size_t chunk_size)
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: raw_working_buffer_(static_cast<std::byte*>(
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heap_caps_malloc(chunk_size * kWorkingBufferMultiple,
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MALLOC_CAP_SPIRAM))),
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working_buffer_(raw_working_buffer_,
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chunk_size * kWorkingBufferMultiple) {}
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ChunkReader::~ChunkReader() {
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free(raw_working_buffer_);
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}
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auto ChunkReader::HandleNewData(cpp::span<std::byte> data)
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-> cpp::span<std::byte> {
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assert(leftover_bytes_ + data.size() <= working_buffer_.size());
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// Copy the new data onto the front for anything that was left over from the
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// last portion. Note: this could be optimised for the '0 leftover bytes'
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// case, which technically shouldn't need a copy.
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std::copy(data.begin(), data.end(),
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working_buffer_.begin() + leftover_bytes_);
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last_data_in_working_buffer_ =
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working_buffer_.first(leftover_bytes_ + data.size());
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leftover_bytes_ = 0;
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return last_data_in_working_buffer_;
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}
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auto ChunkReader::HandleBytesUsed(std::size_t bytes_used) -> void {
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HandleBytesLeftOver(last_data_in_working_buffer_.size() - bytes_used);
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}
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auto ChunkReader::HandleBytesLeftOver(std::size_t bytes_left) -> void {
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leftover_bytes_ = bytes_left;
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// Ensure that we don't have more than a chunk of leftever bytes. This is
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// bad, because we probably won't have enough data to store the next chunk.
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assert(leftover_bytes_ <= working_buffer_.size() / kWorkingBufferMultiple);
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if (leftover_bytes_ > 0) {
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auto data_to_keep = last_data_in_working_buffer_.last(leftover_bytes_);
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std::copy(data_to_keep.begin(), data_to_keep.end(),
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working_buffer_.begin());
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}
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}
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auto ChunkReader::GetLeftovers() -> cpp::span<std::byte> {
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return working_buffer_.first(leftover_bytes_);
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}
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} // namespace audio
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