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LibVideo: Parse Matroska from ReadonlyBytes and keep the start position

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Keeping the entire Matroska stream available is a prerequisite to being
able to stream from it and seek to cue points.
This commit is contained in:
Zaggy1024 2022-11-10 16:58:53 -06:00 • committed by Andreas Kling
parent 2dfd236dcd
commit be9de58932
3 changed files with 21 additions and 23 deletions
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16
Userland/Libraries/LibVideo/Containers/Matroska/Reader.cpp
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@ -58,12 +58,12 @@ constexpr u32 TIMESTAMP_ID = 0xE7;
DecoderErrorOr<NonnullOwnPtr<MatroskaDocument>> Reader::parse_matroska_from_file(StringView path)
{
auto mapped_file = DECODER_TRY(DecoderErrorCategory::IO, Core::MappedFile::map(path));
return parse_matroska_from_data((u8*)mapped_file->data(), mapped_file->size());
return parse_matroska_from_data(mapped_file->bytes());
}
DecoderErrorOr<NonnullOwnPtr<MatroskaDocument>> Reader::parse_matroska_from_data(u8 const* data, size_t size)
DecoderErrorOr<NonnullOwnPtr<MatroskaDocument>> Reader::parse_matroska_from_data(ReadonlyBytes data)
{
Reader reader(data, size);
Reader reader(data);
return reader.parse();
}
@ -426,9 +426,10 @@ ErrorOr<u8> Reader::Streamer::read_octet()
dbgln_if(MATROSKA_TRACE_DEBUG, "Ran out of stream data");
return Error::from_string_literal("Stream is out of data");
}
m_size_remaining--;
u8 byte = *data();
m_octets_read.last()++;
return *(m_data_ptr++);
m_position++;
return byte;
}
ErrorOr<i16> Reader::Streamer::read_i16()
@ -438,7 +439,7 @@ ErrorOr<i16> Reader::Streamer::read_i16()
ErrorOr<u64> Reader::Streamer::read_variable_size_integer(bool mask_length)
{
dbgln_if(MATROSKA_TRACE_DEBUG, "Reading from offset {:p}", m_data_ptr);
dbgln_if(MATROSKA_TRACE_DEBUG, "Reading from offset {:p}", data());
auto length_descriptor = TRY(read_octet());
dbgln_if(MATROSKA_TRACE_DEBUG, "Reading VINT, first byte is {:#02x}", length_descriptor);
if (length_descriptor == 0)
@ -495,9 +496,8 @@ ErrorOr<void> Reader::Streamer::drop_octets(size_t num_octets)
{
if (remaining() < num_octets)
return Error::from_string_literal("Tried to drop octets past the end of the stream");
m_size_remaining -= num_octets;
m_position += num_octets;
m_octets_read.last() += num_octets;
m_data_ptr += num_octets;
return {};
}