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LibAudio: Convert FlacLoader to use new Core::Stream APIs :^)

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For this change to work "easily", Loader can't take const ByteBuffer's
anymore, which is fine for now.
This commit is contained in:
kleines Filmröllchen 2022-01-14 01:14:24 +01:00 • committed by Ali Mohammad Pur
parent 4f48a086b7
commit 8a92573732
7 changed files with 113 additions and 175 deletions
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78
Userland/Libraries/LibAudio/FlacLoader.h
View file

@ -9,63 +9,23 @@
#include "Buffer.h"
#include "FlacTypes.h"
#include "Loader.h"
#include <AK/BitStream.h>
#include <AK/Buffered.h>
#include <AK/Error.h>
#include <AK/Stream.h>
#include <AK/Span.h>
#include <AK/Types.h>
#include <AK/Variant.h>
#include <LibCore/FileStream.h>
#include <LibCore/InputBitStream.h>
#include <LibCore/MemoryStream.h>
#include <LibCore/Stream.h>
namespace Audio {
using Core::Stream::BigEndianInputBitStream;
// Experimentally determined to be a decent buffer size on i686:
// 4K (the default) is slightly worse, and 64K is much worse.
// At sufficiently large buffer sizes, the advantage of infrequent read() calls is outweighed by the memmove() overhead.
// There was no intensive fine-tuning done to determine this value, so improvements may definitely be possible.
constexpr size_t FLAC_BUFFER_SIZE = 8 * KiB;
template<size_t Size = FLAC_BUFFER_SIZE>
class FlacInputStream : public Variant<Buffered<Core::InputFileStream, Size>, InputMemoryStream> {
public:
using Variant<Buffered<Core::InputFileStream, Size>, InputMemoryStream>::Variant;
bool seek(size_t pos)
{
return this->visit(
[&](Buffered<Core::InputFileStream, Size>& buffered) {
// Discard the buffer, then seek normally.
if (!buffered.discard_or_error(buffered.buffered()))
return false;
return buffered.underlying_stream().seek(pos);
},
[&](InputMemoryStream& stream) {
if (pos >= stream.bytes().size()) {
return false;
}
stream.seek(pos);
return true;
});
}
bool handle_any_error()
{
return this->visit(
[&](auto& stream) {
return stream.handle_any_error();
});
}
InputBitStream bit_stream()
{
return this->visit(
[&](auto& stream) {
return InputBitStream(stream);
});
}
};
ALWAYS_INLINE u8 frame_channel_type_to_channel_count(FlacFrameChannelType channel_type);
// Sign-extend an arbitrary-size signed number to 64 bit signed
ALWAYS_INLINE i64 sign_extend(u32 n, u8 size);
@ -75,18 +35,16 @@ ALWAYS_INLINE i32 rice_to_signed(u32 x);
// decoders
// read a UTF-8 encoded number, even if it is not a valid codepoint
ALWAYS_INLINE u64 read_utf8_char(InputStream& input);
ALWAYS_INLINE ErrorOr<u64> read_utf8_char(BigEndianInputBitStream& input);
// decode a single number encoded with exponential golomb encoding of the specified order
ALWAYS_INLINE i32 decode_unsigned_exp_golomb(u8 order, InputBitStream& bit_input);
ALWAYS_INLINE ErrorOr<i32> decode_unsigned_exp_golomb(u8 order, BigEndianInputBitStream& bit_input);
class FlacLoaderPlugin : public LoaderPlugin {
public:
explicit FlacLoaderPlugin(StringView path);
explicit FlacLoaderPlugin(const ByteBuffer& buffer);
explicit FlacLoaderPlugin(Bytes& buffer);
~FlacLoaderPlugin()
{
if (m_stream)
m_stream->handle_any_error();
}
virtual MaybeLoaderError initialize() override;
@ -111,20 +69,20 @@ private:
MaybeLoaderError parse_header();
// Either returns the metadata block or sets error message.
// Additionally, increments m_data_start_location past the read meta block.
ErrorOr<FlacRawMetadataBlock, LoaderError> next_meta_block(InputBitStream& bit_input);
ErrorOr<FlacRawMetadataBlock, LoaderError> next_meta_block(BigEndianInputBitStream& bit_input);
// Fetches and writes the next FLAC frame
MaybeLoaderError next_frame(Span<Sample>);
// Helper of next_frame that fetches a sub frame's header
ErrorOr<FlacSubframeHeader, LoaderError> next_subframe_header(InputBitStream& bit_input, u8 channel_index);
ErrorOr<FlacSubframeHeader, LoaderError> next_subframe_header(BigEndianInputBitStream& bit_input, u8 channel_index);
// Helper of next_frame that decompresses a subframe
ErrorOr<Vector<i32>, LoaderError> parse_subframe(FlacSubframeHeader& subframe_header, InputBitStream& bit_input);
ErrorOr<Vector<i32>, LoaderError> parse_subframe(FlacSubframeHeader& subframe_header, BigEndianInputBitStream& bit_input);
// Subframe-internal data decoders (heavy lifting)
ErrorOr<Vector<i32>, LoaderError> decode_fixed_lpc(FlacSubframeHeader& subframe, InputBitStream& bit_input);
ErrorOr<Vector<i32>, LoaderError> decode_verbatim(FlacSubframeHeader& subframe, InputBitStream& bit_input);
ErrorOr<Vector<i32>, LoaderError> decode_custom_lpc(FlacSubframeHeader& subframe, InputBitStream& bit_input);
MaybeLoaderError decode_residual(Vector<i32>& decoded, FlacSubframeHeader& subframe, InputBitStream& bit_input);
ErrorOr<Vector<i32>, LoaderError> decode_fixed_lpc(FlacSubframeHeader& subframe, BigEndianInputBitStream& bit_input);
ErrorOr<Vector<i32>, LoaderError> decode_verbatim(FlacSubframeHeader& subframe, BigEndianInputBitStream& bit_input);
ErrorOr<Vector<i32>, LoaderError> decode_custom_lpc(FlacSubframeHeader& subframe, BigEndianInputBitStream& bit_input);
MaybeLoaderError decode_residual(Vector<i32>& decoded, FlacSubframeHeader& subframe, BigEndianInputBitStream& bit_input);
// decode a single rice partition that has its own rice parameter
ALWAYS_INLINE Vector<i32> decode_rice_partition(u8 partition_type, u32 partitions, u32 partition_index, FlacSubframeHeader& subframe, InputBitStream& bit_input);
ALWAYS_INLINE ErrorOr<Vector<i32>, LoaderError> decode_rice_partition(u8 partition_type, u32 partitions, u32 partition_index, FlacSubframeHeader& subframe, BigEndianInputBitStream& bit_input);
// Converters for special coding used in frame headers
ALWAYS_INLINE ErrorOr<u32, LoaderError> convert_sample_count_code(u8 sample_count_code);
@ -150,7 +108,7 @@ private:
// keep track of the start of the data in the FLAC stream to seek back more easily
u64 m_data_start_location { 0 };
OwnPtr<FlacInputStream<FLAC_BUFFER_SIZE>> m_stream;
OwnPtr<Core::Stream::SeekableStream> m_stream;
Optional<FlacFrameHeader> m_current_frame;
// Whatever the last get_more_samples() call couldn't return gets stored here.
Vector<Sample, FLAC_BUFFER_SIZE> m_unread_data;