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0f22dfa634
`WavWriter` can be constructed without a file, which should probably be made impossible at some point. For now, let's not crash `Piano` when you close the application.
121 lines
3.1 KiB
C++
121 lines
3.1 KiB
C++
/*
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* Copyright (c) 2020, William McPherson <willmcpherson2@gmail.com>
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* Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibAudio/WavWriter.h>
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namespace Audio {
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ErrorOr<NonnullOwnPtr<WavWriter>> WavWriter::create_from_file(StringView path, int sample_rate, u16 num_channels, u16 bits_per_sample)
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{
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auto wav_writer = TRY(adopt_nonnull_own_or_enomem(new (nothrow) WavWriter(sample_rate, num_channels, bits_per_sample)));
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TRY(wav_writer->set_file(path));
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return wav_writer;
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}
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WavWriter::WavWriter(int sample_rate, u16 num_channels, u16 bits_per_sample)
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: m_sample_rate(sample_rate)
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, m_num_channels(num_channels)
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, m_bits_per_sample(bits_per_sample)
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{
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}
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WavWriter::~WavWriter()
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{
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if (!m_finalized)
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finalize();
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}
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ErrorOr<void> WavWriter::set_file(StringView path)
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{
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m_file = TRY(Core::File::open(path, Core::File::OpenMode::ReadWrite));
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TRY(m_file->seek(44, SeekMode::SetPosition));
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m_finalized = false;
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return {};
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}
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ErrorOr<void> WavWriter::write_samples(Span<Sample> samples)
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{
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m_data_sz += samples.size() * sizeof(Sample);
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for (auto const& sample : samples) {
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// FIXME: This only really works for 16-bit samples.
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u16 left = static_cast<i16>(sample.left * static_cast<float>(1 << m_bits_per_sample));
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u16 right = static_cast<i16>(sample.right * static_cast<float>(1 << m_bits_per_sample));
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// FIXME: This ignores endianness.
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TRY(m_file->write_value(left));
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TRY(m_file->write_value(right));
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}
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return {};
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}
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void WavWriter::finalize()
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{
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VERIFY(!m_finalized);
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m_finalized = true;
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if (m_file && m_file->is_open()) {
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auto result = [&]() -> ErrorOr<void> {
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TRY(m_file->seek(0, SeekMode::SetPosition));
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return TRY(write_header());
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}();
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if (result.is_error())
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dbgln("Failed to finalize WavWriter: {}", result.error());
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m_file->close();
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}
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m_data_sz = 0;
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}
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ErrorOr<void> WavWriter::write_header()
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{
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// "RIFF"
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static u32 riff = 0x46464952;
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TRY(m_file->write_value(riff));
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// Size of data + (size of header - previous field - this field)
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u32 sz = m_data_sz + (44 - 4 - 4);
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TRY(m_file->write_value(sz));
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// "WAVE"
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static u32 wave = 0x45564157;
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TRY(m_file->write_value(wave));
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// "fmt "
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static u32 fmt_id = 0x20746D66;
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TRY(m_file->write_value(fmt_id));
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// Size of the next 6 fields
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static u32 fmt_size = 16;
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TRY(m_file->write_value(fmt_size));
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// 1 for PCM
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static u16 audio_format = 1;
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TRY(m_file->write_value(audio_format));
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TRY(m_file->write_value(m_num_channels));
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TRY(m_file->write_value(m_sample_rate));
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u32 byte_rate = m_sample_rate * m_num_channels * (m_bits_per_sample / 8);
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TRY(m_file->write_value(byte_rate));
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u16 block_align = m_num_channels * (m_bits_per_sample / 8);
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TRY(m_file->write_value(block_align));
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TRY(m_file->write_value(m_bits_per_sample));
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// "data"
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static u32 chunk_id = 0x61746164;
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TRY(m_file->write_value(chunk_id));
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TRY(m_file->write_value(m_data_sz));
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return {};
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}
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}
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