mirror of
https://github.com/sle118/squeezelite-esp32.git
synced 2025-12-07 20:17:04 +03:00
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
#pragma once
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#include <cstddef> // for size_t
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#include <cstdint> // for uint8_t
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#include <memory> // for shared_ptr, unique_ptr
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#include <string> // for string
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#include <vector> // for vector
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#include "Crypto.h" // for Crypto
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#include "HTTPClient.h" // for HTTPClient
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namespace bell {
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class WrappedSemaphore;
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} // namespace bell
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namespace cspot {
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class AccessKeyFetcher;
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class CDNAudioFile {
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public:
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CDNAudioFile(const std::string& cdnUrl, const std::vector<uint8_t>& audioKey);
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/**
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* @brief Opens connection to the provided cdn url, and fetches track metadata.
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*/
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void openStream();
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/**
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* @brief Read and decrypt part of the cdn stream
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*
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* @param dst buffer where to read received data to
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* @param amount of bytes to read
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*
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* @returns amount of bytes read
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*/
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size_t readBytes(uint8_t* dst, size_t bytes);
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/**
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* @brief Returns current position in CDN stream
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*/
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size_t getPosition();
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/**
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* @brief returns total size of the audio file in bytes
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*/
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size_t getSize();
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/**
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* @brief Seeks the track to provided position
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* @param position position where to seek the track
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*/
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void seek(size_t position);
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private:
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const int OPUS_HEADER_SIZE = 8 * 1024;
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const int OPUS_FOOTER_PREFFERED = 1024 * 12; // 12K should be safe
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const int SEEK_MARGIN_SIZE = 1024 * 4;
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const int HTTP_BUFFER_SIZE = 1024 * 14;
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const int SPOTIFY_OPUS_HEADER = 167;
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// Used to store opus metadata, speeds up read
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std::vector<uint8_t> header = std::vector<uint8_t>(OPUS_HEADER_SIZE);
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std::vector<uint8_t> footer;
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// General purpose buffer to read data
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std::vector<uint8_t> httpBuffer = std::vector<uint8_t>(HTTP_BUFFER_SIZE);
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// AES IV for decrypting the audio stream
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const std::vector<uint8_t> audioAESIV = {0x72, 0xe0, 0x67, 0xfb, 0xdd, 0xcb,
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0xcf, 0x77, 0xeb, 0xe8, 0xbc, 0x64,
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0x3f, 0x63, 0x0d, 0x93};
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std::unique_ptr<Crypto> crypto;
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std::unique_ptr<bell::HTTPClient::Response> httpConnection;
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size_t position = 0;
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size_t totalFileSize = 0;
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size_t lastRequestPosition = 0;
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size_t lastRequestCapacity = 0;
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bool enableRequestMargin = false;
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std::string cdnUrl;
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std::vector<uint8_t> audioKey;
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void decrypt(uint8_t* dst, size_t nbytes, size_t pos);
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};
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} // namespace cspot
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