95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
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/*
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* OggStream.h
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* -----------
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* Purpose: Basic Ogg stream parsing functionality
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "BuildSettings.h"
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#include "../common/Endianness.h"
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#include "../common/mptIO.h"
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#include "../common/FileReaderFwd.h"
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OPENMPT_NAMESPACE_BEGIN
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namespace Ogg
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{
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struct PageHeader
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{
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char capture_pattern[4]; // "OggS"
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uint8le version;
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uint8le header_type;
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uint64le granule_position;
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uint32le bitstream_serial_number;
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uint32le page_sequence_number;
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uint32le CRC_checksum;
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uint8le page_segments;
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};
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} // namespace Ogg
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MPT_BINARY_STRUCT(Ogg::PageHeader, 27)
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namespace Ogg {
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struct PageInfo
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{
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PageHeader header;
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uint8 segment_table[255];
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PageInfo()
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{
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MemsetZero(header);
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MemsetZero(segment_table);
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}
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uint16 GetPagePhysicalSize() const;
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uint16 GetPageHeaderSize() const;
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uint16 GetPageDataSize() const;
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};
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// returns false on EOF
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bool AdvanceToPageMagic(FileReader &file);
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bool ReadPage(FileReader &file, PageInfo &pageInfo, std::vector<uint8> *pageData = nullptr);
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bool ReadPage(FileReader &file, PageInfo &pageInfo, std::vector<uint8> &pageData);
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bool ReadPage(FileReader &file);
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bool ReadPageAndSkipJunk(FileReader &file, PageInfo &pageInfo, std::vector<uint8> &pageData);
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bool UpdatePageCRC(PageInfo &pageInfo, const std::vector<uint8> &pageData);
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template <typename Tfile>
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bool WritePage(Tfile & f, const PageInfo &pageInfo, const std::vector<uint8> &pageData)
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{
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if(!mpt::IO::Write(f, pageInfo.header))
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{
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return false;
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}
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if(!mpt::IO::WriteRaw(f, pageInfo.segment_table, pageInfo.header.page_segments))
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{
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return false;
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}
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if(!mpt::IO::WriteRaw(f, pageData.data(), pageData.size()))
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{
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return false;
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}
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return true;
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}
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} // namespace Ogg
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OPENMPT_NAMESPACE_END
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