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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#pragma once
#include <cstddef>
#include <cstdint>
#include <optional>
#include <string>
#include <utility>
#include <span>
#include "mad.h"
#include "sample.hpp"
#include "source_buffer.hpp"
#include "codec.hpp"
namespace codecs {
class MadMp3Decoder : public ICodec {
public:
MadMp3Decoder();
~MadMp3Decoder();
auto OpenStream(std::shared_ptr<IStream> input,uint32_t offset)
-> cpp::result<OutputFormat, Error> override;
auto DecodeTo(std::span<sample::Sample> destination)
-> cpp::result<OutputInfo, Error> override;
MadMp3Decoder(const MadMp3Decoder&) = delete;
MadMp3Decoder& operator=(const MadMp3Decoder&) = delete;
private:
auto SkipID3Tags(IStream& stream) -> std::optional<uint32_t>;
struct Mp3Info {
uint16_t starting_sample;
uint64_t length;
std::optional<uint32_t> bytes;
std::optional<std::span<const unsigned char, 100>> toc;
};
auto GetMp3Info(const mad_header& header) -> std::optional<Mp3Info>;
auto GetBytesUsed() -> std::size_t;
std::shared_ptr<IStream> input_;
SourceBuffer buffer_;
std::unique_ptr<mad_stream> stream_;
std::unique_ptr<mad_frame> frame_;
std::unique_ptr<mad_synth> synth_;
// Count of samples processed in the current frame (channels combined)
int current_frame_sample_;
// Count of samples processed in the current stream (channels separate, i.e. usually x2)
uint64_t current_stream_sample_;
// How many samples in the current stream (channels separate) with encoder delay/padding removed
uint64_t total_samples_;
// Encoder delay, i.e. how many samples to skip at the start of the stream
int skip_samples_;
bool is_eof_;
bool is_eos_;
};
} // namespace codecs
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