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76 lines
1.8 KiB
76 lines
1.8 KiB
2 years ago
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/*
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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 "source_buffer.hpp"
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#include <sys/_stdint.h>
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#include <algorithm>
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#include <cstring>
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#include "esp_heap_caps.h"
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#include "esp_log.h"
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#include "codec.hpp"
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namespace codecs {
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static constexpr char kTag[] = "dec_buf";
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static constexpr size_t kBufferSize = 1024 * 8;
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SourceBuffer::SourceBuffer()
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: buffer_(reinterpret_cast<std::byte*>(
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heap_caps_malloc(kBufferSize, MALLOC_CAP_SPIRAM)),
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kBufferSize),
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bytes_in_buffer_(0),
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offset_of_bytes_(0) {
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assert(buffer_.data() != nullptr);
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}
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SourceBuffer::~SourceBuffer() {
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free(buffer_.data());
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}
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auto SourceBuffer::Refill(IStream* src) -> bool {
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if (bytes_in_buffer_ == buffer_.size_bytes()) {
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return false;
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}
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bool eof = false;
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AddBytes([&](cpp::span<std::byte> buf) -> size_t {
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size_t bytes_read = src->Read(buf);
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eof = bytes_read == 0;
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return bytes_read;
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});
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return eof;
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}
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auto SourceBuffer::AddBytes(std::function<size_t(cpp::span<std::byte>)> writer)
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-> void {
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if (offset_of_bytes_ > 0) {
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std::memmove(buffer_.data(), buffer_.data() + offset_of_bytes_,
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bytes_in_buffer_);
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offset_of_bytes_ = 0;
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}
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size_t added_bytes = std::invoke(writer, buffer_.subspan(bytes_in_buffer_));
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assert(bytes_in_buffer_ + added_bytes <= buffer_.size_bytes());
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bytes_in_buffer_ += added_bytes;
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}
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auto SourceBuffer::ConsumeBytes(
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std::function<size_t(cpp::span<std::byte>)> reader) -> void {
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size_t bytes_consumed = std::invoke(
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reader, buffer_.subspan(offset_of_bytes_).first(bytes_in_buffer_));
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assert(bytes_consumed <= bytes_in_buffer_);
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bytes_in_buffer_ -= bytes_consumed;
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if (bytes_in_buffer_ == 0) {
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offset_of_bytes_ = 0;
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} else {
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offset_of_bytes_ += bytes_consumed;
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}
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}
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} // namespace codecs
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