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https://github.com/RGBCube/serenity
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66c9696687
Currently, the `isobmff` utility will only print the media file type info from the FileTypeBox (major brand and compatible brands), as well as the names and sizes of top-level boxes.
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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* Copyright (c) 2023, Gregory Bertilson <Zaggy1024@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Boxes.h"
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namespace Gfx::ISOBMFF {
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ErrorOr<BoxHeader> read_box_header(Stream& stream)
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{
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BoxHeader header;
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u64 total_size = TRY(stream.read_value<BigEndian<u32>>());
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header.type = TRY(stream.read_value<BoxType>());
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u64 data_size_read = sizeof(u32) + sizeof(BoxType);
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if (total_size == 1) {
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total_size = TRY(stream.read_value<BigEndian<u64>>());
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data_size_read += sizeof(u64);
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}
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header.contents_size = total_size - data_size_read;
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return header;
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}
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void Box::dump(String const& prepend) const
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{
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outln("{}{}", prepend, box_type());
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}
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ErrorOr<void> FullBox::read_from_stream(BoxStream& stream)
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{
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u32 data = TRY(stream.read_value<BigEndian<u32>>());
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// unsigned int(8) version
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version = static_cast<u8>(data >> 24);
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// unsigned int(24) flags
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flags = data & 0xFFF;
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return {};
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}
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void FullBox::dump(String const& prepend) const
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{
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outln("{}{} (version = {}, flags = 0x{:x})", prepend, box_type(), version, flags);
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}
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static String add_indent(String const& string)
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{
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return MUST(String::formatted("{} ", string));
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}
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ErrorOr<void> UnknownBox::read_from_stream(BoxStream& stream)
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{
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m_contents_size = stream.remaining();
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TRY(stream.discard_remaining());
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return {};
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}
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void UnknownBox::dump(String const& prepend) const
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{
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Box::dump(prepend);
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auto indented_prepend = add_indent(prepend);
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outln("{}[ {} bytes ]", prepend, m_contents_size);
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}
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ErrorOr<void> FileTypeBox::read_from_stream(BoxStream& stream)
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{
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// unsigned int(32) major_brand;
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major_brand = TRY(stream.read_value<BrandIdentifier>());
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// unsigned int(32) minor_version;
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minor_version = TRY(stream.read_value<BigEndian<u32>>());
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// unsigned int(32) compatible_brands[]; // to end of the box
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if (stream.remaining() % sizeof(BrandIdentifier) != 0)
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return Error::from_string_literal("FileTypeBox compatible_brands contains a partial brand");
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for (auto minor_brand_count = stream.remaining() / sizeof(BrandIdentifier); minor_brand_count > 0; minor_brand_count--)
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TRY(compatible_brands.try_append(TRY(stream.read_value<BrandIdentifier>())));
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return {};
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}
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void FileTypeBox::dump(String const& prepend) const
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{
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FullBox::dump(prepend);
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auto indented_prepend = add_indent(prepend);
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outln("{}- major_brand = {}", prepend, major_brand);
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outln("{}- minor_version = {}", prepend, minor_version);
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StringBuilder compatible_brands_string;
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compatible_brands_string.append("- compatible_brands = { "sv);
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for (size_t i = 0; i < compatible_brands.size() - 1; i++)
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compatible_brands_string.appendff("{}, ", compatible_brands[i]);
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compatible_brands_string.appendff("{} }}", compatible_brands[compatible_brands.size() - 1]);
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outln("{}{}", prepend, compatible_brands_string.string_view());
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}
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}
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