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LibAudio: Port the MP3 plugin to Core::Stream

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This commit is contained in:
Lucas CHOLLET 2022-10-13 14:59:06 +02:00 • committed by Linus Groh
parent 597a614ce6
commit bb17ee8397
2 changed files with 53 additions and 108 deletions
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148
Userland/Libraries/LibAudio/MP3Loader.cpp
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@ -8,8 +8,6 @@
#include "MP3HuffmanTables.h"
#include "MP3Tables.h"
#include <AK/FixedArray.h>
#include <LibCore/File.h>
#include <LibCore/FileStream.h>
namespace Audio {
@ -17,50 +15,14 @@ DSP::MDCT<12> MP3LoaderPlugin::s_mdct_12;
DSP::MDCT<36> MP3LoaderPlugin::s_mdct_36;
MP3LoaderPlugin::MP3LoaderPlugin(StringView path)
: m_file(Core::File::construct(path))
: m_path(path)
{
if (!m_file->open(Core::OpenMode::ReadOnly)) {
m_error = LoaderError { LoaderError::Category::IO, String::formatted("Can't open file: {}", m_file->error_string()) };
return;
}
off_t file_size = 0;
if (!m_file->seek(0, Core::SeekMode::FromEndPosition, &file_size)) {
m_error = LoaderError { LoaderError::Category::IO, "Could not seek in file." };
return;
}
m_file_size = file_size;
if (!m_file->seek(0, Core::SeekMode::SetPosition)) {
m_error = LoaderError { LoaderError::Category::IO, "Could not seek in file." };
return;
}
m_input_stream = make<Core::InputFileStream>(*m_file);
if (!m_input_stream || m_input_stream->has_any_error()) {
m_error = LoaderError { LoaderError::Category::Internal, "Could not create input stream on file." };
return;
}
m_bitstream = make<InputBitStream>(*m_input_stream);
if (!m_bitstream || m_bitstream->has_any_error()) {
m_error = LoaderError { LoaderError::Category::Internal, "Could not create bit stream on top of input stream" };
return;
}
}
MP3LoaderPlugin::~MP3LoaderPlugin()
{
if (m_bitstream)
m_bitstream->handle_any_error();
if (m_input_stream)
m_input_stream->handle_any_error();
}
MaybeLoaderError MP3LoaderPlugin::initialize()
{
if (m_error.has_value())
return m_error.release_value();
m_stream = LOADER_TRY(Core::Stream::File::open(m_path, Core::Stream::OpenMode::Read));
m_bitstream = LOADER_TRY(Core::Stream::BigEndianInputBitStream::construct(*m_stream));
TRY(synchronize());
@ -72,15 +34,9 @@ MaybeLoaderError MP3LoaderPlugin::initialize()
m_num_channels = header.channel_count();
m_loaded_samples = 0;
if (!m_file->seek(0, Core::SeekMode::SetPosition))
return LoaderError { LoaderError::Category::IO, "Could not seek in file." };
TRY(build_seek_table());
if (!m_file->seek(0, Core::SeekMode::SetPosition))
return LoaderError { LoaderError::Category::IO, "Could not seek in file." };
m_bitstream->handle_any_error();
LOADER_TRY(m_stream->seek(0, Core::Stream::SeekMode::SetPosition));
return {};
}
@ -100,7 +56,7 @@ MaybeLoaderError MP3LoaderPlugin::seek(int const position)
{
for (auto const& seek_entry : m_seek_table) {
if (seek_entry.get<1>() >= position) {
m_file->seek(seek_entry.get<0>(), Core::SeekMode::SetPosition);
LOADER_TRY(m_stream->seek(seek_entry.get<0>(), Core::Stream::SeekMode::SetPosition));
m_loaded_samples = seek_entry.get<1>();
break;
}
@ -109,8 +65,6 @@ MaybeLoaderError MP3LoaderPlugin::seek(int const position)
m_current_frame_read = 0;
m_synthesis_buffer = {};
m_bit_reservoir.discard_or_error(m_bit_reservoir.size());
m_input_stream->handle_any_error();
m_bitstream->handle_any_error();
m_bit_reservoir.handle_any_error();
m_is_first_frame = true;
return {};
@ -125,7 +79,7 @@ LoaderSamples MP3LoaderPlugin::get_more_samples(size_t max_samples_to_read_from_
if (!m_current_frame.has_value()) {
auto maybe_frame = read_next_frame();
if (maybe_frame.is_error()) {
if (m_input_stream->unreliable_eof()) {
if (m_stream->is_eof()) {
return FixedArray<Sample> {};
}
return maybe_frame.release_error();
@ -168,10 +122,7 @@ MaybeLoaderError MP3LoaderPlugin::build_seek_table()
m_bitstream->align_to_byte_boundary();
while (!synchronize().is_error()) {
off_t frame_pos = 0;
if (!m_file->seek(0, Core::SeekMode::FromCurrentPosition, &frame_pos))
return LoaderError { LoaderError::Category::IO, String::formatted("Could not get stream position at frame {}.", frame_count) };
frame_pos -= 2;
auto const frame_pos = -2 + LOADER_TRY(m_stream->seek(0, Core::Stream::SeekMode::FromCurrentPosition));
auto error_or_header = read_header();
if (error_or_header.is_error() || error_or_header.value().id != 1 || error_or_header.value().layer != 3) {
@ -183,9 +134,7 @@ MaybeLoaderError MP3LoaderPlugin::build_seek_table()
if (frame_count % 10 == 0)
m_seek_table.append({ frame_pos, sample_count });
size_t const next_frame_position = error_or_header.value().frame_size - 6;
if (!m_file->seek(error_or_header.value().frame_size - 6, Core::SeekMode::FromCurrentPosition))
return LoaderError { LoaderError::Category::IO, String::formatted("Could not seek to frame {} (stream position {}).", frame_count, next_frame_position) };
LOADER_TRY(m_stream->seek(error_or_header.value().frame_size - 6, Core::Stream::SeekMode::FromCurrentPosition));
// TODO: This is just here to clear the bitstream buffer.
// Bitstream should have a method to sync its state to the underlying stream.
@ -198,26 +147,26 @@ MaybeLoaderError MP3LoaderPlugin::build_seek_table()
ErrorOr<MP3::Header, LoaderError> MP3LoaderPlugin::read_header()
{
MP3::Header header;
header.id = m_bitstream->read_bit_big_endian();
header.layer = MP3::Tables::LayerNumberLookup[m_bitstream->read_bits_big_endian(2)];
header.id = LOADER_TRY(m_bitstream->read_bit());
header.layer = MP3::Tables::LayerNumberLookup[LOADER_TRY(m_bitstream->read_bits(2))];
if (header.layer <= 0)
return LoaderError { LoaderError::Category::Format, m_loaded_samples, "Frame header contains invalid layer number." };
header.protection_bit = m_bitstream->read_bit_big_endian();
header.bitrate = MP3::Tables::BitratesPerLayerLookup[header.layer - 1][m_bitstream->read_bits_big_endian(4)];
header.protection_bit = LOADER_TRY(m_bitstream->read_bit());
header.bitrate = MP3::Tables::BitratesPerLayerLookup[header.layer - 1][LOADER_TRY(m_bitstream->read_bits(4))];
if (header.bitrate <= 0)
return LoaderError { LoaderError::Category::Format, m_loaded_samples, "Frame header contains invalid bitrate." };
header.samplerate = MP3::Tables::SampleratesLookup[m_bitstream->read_bits_big_endian(2)];
header.samplerate = MP3::Tables::SampleratesLookup[LOADER_TRY(m_bitstream->read_bits(2))];
if (header.samplerate <= 0)
return LoaderError { LoaderError::Category::Format, m_loaded_samples, "Frame header contains invalid samplerate." };
header.padding_bit = m_bitstream->read_bit_big_endian();
header.private_bit = m_bitstream->read_bit_big_endian();
header.mode = static_cast<MP3::Mode>(m_bitstream->read_bits_big_endian(2));
header.mode_extension = static_cast<MP3::ModeExtension>(m_bitstream->read_bits_big_endian(2));
header.copyright_bit = m_bitstream->read_bit_big_endian();
header.original_bit = m_bitstream->read_bit_big_endian();
header.emphasis = static_cast<MP3::Emphasis>(m_bitstream->read_bits_big_endian(2));
header.padding_bit = LOADER_TRY(m_bitstream->read_bit());
header.private_bit = LOADER_TRY(m_bitstream->read_bit());
header.mode = static_cast<MP3::Mode>(LOADER_TRY(m_bitstream->read_bits(2)));
header.mode_extension = static_cast<MP3::ModeExtension>(LOADER_TRY(m_bitstream->read_bits(2)));
header.copyright_bit = LOADER_TRY(m_bitstream->read_bit());
header.original_bit = LOADER_TRY(m_bitstream->read_bit());
header.emphasis = static_cast<MP3::Emphasis>(LOADER_TRY(m_bitstream->read_bits(2)));
if (!header.protection_bit)
header.crc16 = static_cast<u16>(m_bitstream->read_bits_big_endian(16));
header.crc16 = LOADER_TRY(m_bitstream->read_bits<u16>(16));
header.frame_size = 144 * header.bitrate * 1000 / header.samplerate + header.padding_bit;
header.slot_count = header.frame_size - ((header.channel_count() == 2 ? 32 : 17) + (header.protection_bit ? 0 : 2) + 4);
return header;
@ -226,8 +175,8 @@ ErrorOr<MP3::Header, LoaderError> MP3LoaderPlugin::read_header()
MaybeLoaderError MP3LoaderPlugin::synchronize()
{
size_t one_counter = 0;
while (one_counter < 12 && !m_bitstream->has_any_error()) {
bool const bit = m_bitstream->read_bit_big_endian();
while (one_counter < 12 && !m_bitstream->is_eof()) {
bool const bit = LOADER_TRY(m_bitstream->read_bit());
one_counter = bit ? one_counter + 1 : 0;
if (!bit) {
m_bitstream->align_to_byte_boundary();
@ -240,7 +189,9 @@ MaybeLoaderError MP3LoaderPlugin::synchronize()
ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_next_frame()
{
while (!m_bitstream->has_any_error()) {
// Note: This will spin until we find a correct frame, or we reach eof.
// In the second case, the error will bubble up from read_frame_data().
while (true) {
TRY(synchronize());
MP3::Header header = TRY(read_header());
if (header.id != 1 || header.layer != 3) {
@ -249,7 +200,6 @@ ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_next_frame()
return read_frame_data(header, m_is_first_frame);
}
return LoaderError { LoaderError::Category::Internal, m_loaded_samples, "Could not find another frame." };
}
ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_frame_data(MP3::Header const& header, bool is_first_frame)
@ -257,8 +207,6 @@ ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_frame_data(MP3::Header
MP3::MP3Frame frame { header };
TRY(read_side_information(frame));
if (m_bitstream->has_any_error())
return LoaderError { LoaderError::Category::IO, m_loaded_samples, "Read error" };
auto maybe_buffer = ByteBuffer::create_uninitialized(header.slot_count);
if (maybe_buffer.is_error())
@ -266,8 +214,8 @@ ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_frame_data(MP3::Header
auto& buffer = maybe_buffer.value();
size_t old_reservoir_size = m_bit_reservoir.size();
if (m_bitstream->read(buffer) != buffer.size())
return LoaderError { LoaderError::Category::IO, m_loaded_samples, "Could not read whole frame." };
if (LOADER_TRY(m_bitstream->read(buffer)).size() != buffer.size())
return LoaderError { LoaderError::Category::IO, m_loaded_samples, "Could not find another whole frame." };
if (m_bit_reservoir.write(buffer) != header.slot_count)
return LoaderError { LoaderError::Category::IO, m_loaded_samples, "Could not write frame into bit reservoir." };
@ -351,50 +299,48 @@ ErrorOr<MP3::MP3Frame, LoaderError> MP3LoaderPlugin::read_frame_data(MP3::Header
MaybeLoaderError MP3LoaderPlugin::read_side_information(MP3::MP3Frame& frame)
{
frame.main_data_begin = m_bitstream->read_bits_big_endian(9);
frame.main_data_begin = LOADER_TRY(m_bitstream->read_bits(9));
if (frame.header.channel_count() == 1) {
frame.private_bits = m_bitstream->read_bits_big_endian(5);
frame.private_bits = LOADER_TRY(m_bitstream->read_bits(5));
} else {
frame.private_bits = m_bitstream->read_bits_big_endian(3);
frame.private_bits = LOADER_TRY(m_bitstream->read_bits(3));
}
for (size_t channel_index = 0; channel_index < frame.header.channel_count(); channel_index++) {
for (size_t scale_factor_selection_info_band = 0; scale_factor_selection_info_band < 4; scale_factor_selection_info_band++) {
frame.channels[channel_index].scale_factor_selection_info[scale_factor_selection_info_band] = m_bitstream->read_bit_big_endian();
frame.channels[channel_index].scale_factor_selection_info[scale_factor_selection_info_band] = LOADER_TRY(m_bitstream->read_bit());
}
}
for (size_t granule_index = 0; granule_index < 2; granule_index++) {
for (size_t channel_index = 0; channel_index < frame.header.channel_count(); channel_index++) {
auto& granule = frame.channels[channel_index].granules[granule_index];
granule.part_2_3_length = m_bitstream->read_bits_big_endian(12);
granule.big_values = m_bitstream->read_bits_big_endian(9);
granule.global_gain = m_bitstream->read_bits_big_endian(8);
granule.scalefac_compress = m_bitstream->read_bits_big_endian(4);
granule.window_switching_flag = m_bitstream->read_bit_big_endian();
granule.part_2_3_length = LOADER_TRY(m_bitstream->read_bits(12));
granule.big_values = LOADER_TRY(m_bitstream->read_bits(9));
granule.global_gain = LOADER_TRY(m_bitstream->read_bits(8));
granule.scalefac_compress = LOADER_TRY(m_bitstream->read_bits(4));
granule.window_switching_flag = LOADER_TRY(m_bitstream->read_bit());
if (granule.window_switching_flag) {
granule.block_type = static_cast<MP3::BlockType>(m_bitstream->read_bits_big_endian(2));
granule.mixed_block_flag = m_bitstream->read_bit_big_endian();
granule.block_type = static_cast<MP3::BlockType>(LOADER_TRY(m_bitstream->read_bits(2)));
granule.mixed_block_flag = LOADER_TRY(m_bitstream->read_bit());
for (size_t region = 0; region < 2; region++)
granule.table_select[region] = m_bitstream->read_bits_big_endian(5);
granule.table_select[region] = LOADER_TRY(m_bitstream->read_bits(5));
for (size_t window = 0; window < 3; window++)
granule.sub_block_gain[window] = m_bitstream->read_bits_big_endian(3);
granule.sub_block_gain[window] = LOADER_TRY(m_bitstream->read_bits(3));
granule.region0_count = (granule.block_type == MP3::BlockType::Short && !granule.mixed_block_flag) ? 8 : 7;
granule.region1_count = 36;
} else {
for (size_t region = 0; region < 3; region++)
granule.table_select[region] = m_bitstream->read_bits_big_endian(5);
granule.region0_count = m_bitstream->read_bits_big_endian(4);
granule.region1_count = m_bitstream->read_bits_big_endian(3);
granule.table_select[region] = LOADER_TRY(m_bitstream->read_bits(5));
granule.region0_count = LOADER_TRY(m_bitstream->read_bits(4));
granule.region1_count = LOADER_TRY(m_bitstream->read_bits(3));
}
granule.preflag = m_bitstream->read_bit_big_endian();
granule.scalefac_scale = m_bitstream->read_bit_big_endian();
granule.count1table_select = m_bitstream->read_bit_big_endian();
granule.preflag = LOADER_TRY(m_bitstream->read_bit());
granule.scalefac_scale = LOADER_TRY(m_bitstream->read_bit());
granule.count1table_select = LOADER_TRY(m_bitstream->read_bit());
}
}
if (m_bitstream->has_any_error())
return LoaderError { LoaderError::Category::IO, m_loaded_samples, "Read error" };
return {};
}