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LibAudio: Parse the picture metadata block

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This commit is contained in:
Lucas CHOLLET 2022-10-02 18:48:38 +02:00 • committed by Andrew Kaster
parent db40a514f5
commit 2ddcfcb00f
4 changed files with 98 additions and 0 deletions
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40
Userland/Libraries/LibAudio/FlacLoader.cpp
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@ -112,6 +112,9 @@ MaybeLoaderError FlacLoaderPlugin::parse_header()
case (FlacMetadataBlockType::SEEKTABLE):
TRY(load_seektable(block));
break;
case FlacMetadataBlockType::PICTURE:
TRY(load_picture(block));
break;
case FlacMetadataBlockType::APPLICATION:
// Note: Third-party library can encode specific data in this.
dbgln("Unknown 'Application' metadata block encountered.");
@ -130,6 +133,43 @@ MaybeLoaderError FlacLoaderPlugin::parse_header()
return {};
}
// 11.19. METADATA_BLOCK_PICTURE
MaybeLoaderError FlacLoaderPlugin::load_picture(FlacRawMetadataBlock& block)
{
auto memory_stream = LOADER_TRY(Core::Stream::MemoryStream::construct(block.data.bytes()));
auto picture_block_bytes = LOADER_TRY(BigEndianInputBitStream::construct(*memory_stream));
PictureData picture {};
picture.type = static_cast<ID3PictureType>(LOADER_TRY(picture_block_bytes->read_bits(32)));
auto const mime_string_length = LOADER_TRY(picture_block_bytes->read_bits(32));
// Note: We are seeking before reading the value to ensure that we stayed inside buffer's size.
auto offset_before_seeking = memory_stream->offset();
LOADER_TRY(memory_stream->seek(mime_string_length, Core::Stream::SeekMode::FromCurrentPosition));
picture.mime_string = { block.data.bytes().data() + offset_before_seeking, (size_t)mime_string_length };
auto const description_string_length = LOADER_TRY(picture_block_bytes->read_bits(32));
offset_before_seeking = memory_stream->offset();
LOADER_TRY(memory_stream->seek(description_string_length, Core::Stream::SeekMode::FromCurrentPosition));
picture.description_string = Vector<u32> { Span<u32> { reinterpret_cast<u32*>(block.data.bytes().data() + offset_before_seeking), (size_t)description_string_length } };
picture.width = LOADER_TRY(picture_block_bytes->read_bits(32));
picture.height = LOADER_TRY(picture_block_bytes->read_bits(32));
picture.color_depth = LOADER_TRY(picture_block_bytes->read_bits(32));
picture.colors = LOADER_TRY(picture_block_bytes->read_bits(32));
auto const picture_size = LOADER_TRY(picture_block_bytes->read_bits(32));
offset_before_seeking = memory_stream->offset();
LOADER_TRY(memory_stream->seek(picture_size, Core::Stream::SeekMode::FromCurrentPosition));
picture.data = Vector<u8> { Span<u8> { block.data.bytes().data() + offset_before_seeking, (size_t)picture_size } };
m_pictures.append(move(picture));
return {};
}
// 11.13. METADATA_BLOCK_SEEKTABLE
MaybeLoaderError FlacLoaderPlugin::load_seektable(FlacRawMetadataBlock& block)
{