36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
#include "data_sources.h"
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////////////// SDDataSource //////////////
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SDDataSource::SDDataSource(String file) { _file = SD.open(file, "r"); }
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SDDataSource::~SDDataSource() { if (_file) _file.close(); }
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size_t SDDataSource::read(uint8_t* buf, size_t len) { return _file.read(buf, len); }
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uint8_t SDDataSource::read() { return _file.read(); }
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size_t SDDataSource::position() { return _file.position(); }
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void SDDataSource::seek(size_t position) { _file.seek(position); }
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size_t SDDataSource::size() { return _file.size(); }
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void SDDataSource::close() { _file.close(); }
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void SDDataSource::skip_id3_tag() {
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uint32_t original_position = _file.position();
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uint32_t offset = 0;
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if (_file.read()=='I' && _file.read()=='D' && _file.read()=='3') {
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DEBUG("ID3 tag found\n");
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// Skip ID3 tag version
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_file.read(); _file.read();
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byte tags = _file.read();
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bool footer_present = tags & 0x10;
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DEBUG("ID3 footer found: %d\n", footer_present);
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for (byte i=0; i<4; i++) {
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offset <<= 7;
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offset |= (0x7F & _file.read());
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}
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offset += 10;
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if (footer_present) offset += 10;
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DEBUG("ID3 tag length is %d bytes.\n", offset);
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_file.seek(offset);
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} else {
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DEBUG("No ID3 tag found\n");
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_file.seek(original_position);
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}
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}
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