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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 {
static const std::size_t kWorkingBufferMultiple = 2;
ChunkReader::ChunkReader(std::size_t chunk_size)
: raw_working_buffer_(static_cast<std::byte*>(
heap_caps_malloc(chunk_size * kWorkingBufferMultiple,
MALLOC_CAP_SPIRAM))),
working_buffer_(raw_working_buffer_,
chunk_size * kWorkingBufferMultiple) {}
ChunkReader::~ChunkReader() {
free(raw_working_buffer_);
}
auto ChunkReader::HandleNewData(cpp::span<std::byte> data)
-> cpp::span<std::byte> {
assert(leftover_bytes_ + data.size() <= working_buffer_.size());
// 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.
std::copy(data.begin(), data.end(),
working_buffer_.begin() + leftover_bytes_);
last_data_in_working_buffer_ =
working_buffer_.first(leftover_bytes_ + data.size());
leftover_bytes_ = 0;
return last_data_in_working_buffer_;
}
auto ChunkReader::HandleBytesUsed(std::size_t bytes_used) -> void {
HandleBytesLeftOver(last_data_in_working_buffer_.size() - bytes_used);
}
auto ChunkReader::HandleBytesLeftOver(std::size_t bytes_left) -> void {
leftover_bytes_ = bytes_left;
// Ensure that we don't have more than a chunk of leftever bytes. This is
// bad, because we probably won't have enough data to store the next chunk.
assert(leftover_bytes_ <= working_buffer_.size() / kWorkingBufferMultiple);
if (leftover_bytes_ > 0) {
auto data_to_keep = last_data_in_working_buffer_.last(leftover_bytes_);
std::copy(data_to_keep.begin(), data_to_keep.end(),
working_buffer_.begin());
}
}
auto ChunkReader::GetLeftovers() -> cpp::span<std::byte> {
return working_buffer_.first(leftover_bytes_);
}
} // namespace audio
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