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LibAudio: Remove the m_current_frame field from MP3Loader

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This field was only used within one function, where it could just be a
local variable.
This commit is contained in:
Zaggy1024 2023-08-26 02:11:20 -05:00 • committed by Tim Flynn
parent 88a9ff76b0
commit c1d4ff919a
2 changed files with 11 additions and 20 deletions
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30
Userland/Libraries/LibAudio/MP3Loader.cpp
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@ -81,7 +81,6 @@ MaybeLoaderError MP3LoaderPlugin::initialize()
MaybeLoaderError MP3LoaderPlugin::reset()
{
TRY(seek(0));
m_current_frame = {};
m_synthesis_buffer = {};
m_loaded_samples = 0;
TRY(m_bit_reservoir.discard(m_bit_reservoir.used_buffer_size()));
@ -96,7 +95,6 @@ MaybeLoaderError MP3LoaderPlugin::seek(int const position)
TRY(m_stream->seek(seek_entry->byte_offset, SeekMode::SetPosition));
m_loaded_samples = seek_entry->sample_index;
}
m_current_frame = {};
m_synthesis_buffer = {};
TRY(m_bit_reservoir.discard(m_bit_reservoir.used_buffer_size()));
m_bitstream->align_to_byte_boundary();
@ -110,36 +108,30 @@ ErrorOr<Vector<FixedArray<Sample>>, LoaderError> MP3LoaderPlugin::load_chunks(si
while (samples_to_read > 0) {
FixedArray<Sample> samples = TRY(FixedArray<Sample>::create(MP3::frame_size));
if (!m_current_frame.has_value()) {
auto maybe_frame = read_next_frame();
if (maybe_frame.is_error()) {
if (m_stream->is_eof()) {
return Vector<FixedArray<Sample>> {};
}
return maybe_frame.release_error();
}
m_current_frame = maybe_frame.release_value();
if (!m_current_frame.has_value())
break;
auto maybe_frame = read_next_frame();
if (maybe_frame.is_error()) {
if (m_stream->is_eof())
return Vector<FixedArray<Sample>> {};
return maybe_frame.release_error();
}
auto frame = maybe_frame.release_value();
bool const is_stereo = m_current_frame->header.channel_count() == 2;
bool const is_stereo = frame.header.channel_count() == 2;
size_t current_frame_read = 0;
for (; current_frame_read < MP3::granule_size; current_frame_read++) {
auto const left_sample = m_current_frame->channels[0].granules[0].pcm[current_frame_read / 32][current_frame_read % 32];
auto const right_sample = is_stereo ? m_current_frame->channels[1].granules[0].pcm[current_frame_read / 32][current_frame_read % 32] : left_sample;
auto const left_sample = frame.channels[0].granules[0].pcm[current_frame_read / 32][current_frame_read % 32];
auto const right_sample = is_stereo ? frame.channels[1].granules[0].pcm[current_frame_read / 32][current_frame_read % 32] : left_sample;
samples[current_frame_read] = Sample { left_sample, right_sample };
samples_to_read--;
}
for (; current_frame_read < MP3::frame_size; current_frame_read++) {
auto const left_sample = m_current_frame->channels[0].granules[1].pcm[(current_frame_read - MP3::granule_size) / 32][(current_frame_read - MP3::granule_size) % 32];
auto const right_sample = is_stereo ? m_current_frame->channels[1].granules[1].pcm[(current_frame_read - MP3::granule_size) / 32][(current_frame_read - MP3::granule_size) % 32] : left_sample;
auto const left_sample = frame.channels[0].granules[1].pcm[(current_frame_read - MP3::granule_size) / 32][(current_frame_read - MP3::granule_size) % 32];
auto const right_sample = is_stereo ? frame.channels[1].granules[1].pcm[(current_frame_read - MP3::granule_size) / 32][(current_frame_read - MP3::granule_size) % 32] : left_sample;
samples[current_frame_read] = Sample { left_sample, right_sample };
samples_to_read--;
}
m_loaded_samples += samples.size();
TRY(frames.try_append(move(samples)));
m_current_frame = {};
}
return frames;