Piano+LibAudio: Port to Core::File

Userland/Applications/Piano/AudioPlayerLoop.cpp

@@ -93,14 +93,14 @@ intptr_t AudioPlayerLoop::pipeline_thread_main()
         // The track manager guards against allocations itself.
         m_track_manager.fill_buffer(m_buffer);
 
-        auto result = send_audio_to_server();
         // Tolerate errors in the audio pipeline; we don't want this thread to crash the program. This might likely happen with OOM.
-        if (result.is_error()) [[unlikely]] {
+        if (auto result = send_audio_to_server(); result.is_error()) [[unlikely]] {
             dbgln("Error in audio pipeline: {}", result.error());
             m_track_manager.reset();
         }
 
-        write_wav_if_needed();
+        if (auto result = write_wav_if_needed(); result.is_error()) [[unlikely]]
+            dbgln("Error writing WAV: {}", result.error());
     }
     m_audio_client->async_pause_playback();
     return static_cast<intptr_t>(0);
@@ -131,28 +131,32 @@ ErrorOr<void> AudioPlayerLoop::send_audio_to_server()
     return {};
 }
 
-void AudioPlayerLoop::write_wav_if_needed()
+ErrorOr<void> AudioPlayerLoop::write_wav_if_needed()
 {
     bool _true = true;
     if (m_need_to_write_wav.compare_exchange_strong(_true, false)) {
         m_audio_client->async_pause_playback();
-        m_wav_writer.with_locked([this](auto& wav_writer) {
+        TRY(m_wav_writer.with_locked([this](auto& wav_writer) -> ErrorOr<void> {
             m_track_manager.reset();
             m_track_manager.set_should_loop(false);
             do {
                 // FIXME: This progress detection is crude, but it works for now.
                 m_wav_percent_written.store(static_cast<int>(static_cast<float>(m_track_manager.transport()->time()) / roll_length * 100.0f));
                 m_track_manager.fill_buffer(m_buffer);
-                wav_writer.write_samples(m_buffer.span());
+                TRY(wav_writer.write_samples(m_buffer.span()));
             } while (m_track_manager.transport()->time());
             // FIXME: Make sure that the new TrackManager APIs aren't as bad.
             m_wav_percent_written.store(100);
             m_track_manager.reset();
             m_track_manager.set_should_loop(true);
             wav_writer.finalize();
-        });
+
+            return {};
+        }));
         m_audio_client->async_start_playback();
     }
+
+    return {};
 }
 
 void AudioPlayerLoop::toggle_paused()

Userland/Applications/Piano/AudioPlayerLoop.h

@@ -34,7 +34,7 @@ private:
 
     intptr_t pipeline_thread_main();
     ErrorOr<void> send_audio_to_server();
-    void write_wav_if_needed();
+    ErrorOr<void> write_wav_if_needed();
 
     TrackManager& m_track_manager;
     FixedArray<DSP::Sample> m_buffer;

Userland/Applications/Piano/main.cpp

@@ -65,11 +65,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
             return;
         DeprecatedString error;
         wav_writer.with_locked([&](auto& wav_writer) {
-            wav_writer.set_file(save_path.value());
-            if (wav_writer.has_error()) {
-                error = DeprecatedString::formatted("Failed to export WAV file: {}", wav_writer.error_string());
-                wav_writer.clear_error();
-            }
+            auto error_or_void = wav_writer.set_file(save_path.value());
+            if (error_or_void.is_error())
+                error = DeprecatedString::formatted("Failed to export WAV file: {}", error_or_void.error());
         });
         if (!error.is_empty()) {
             GUI::MessageBox::show_error(window, error);

Userland/Libraries/LibAudio/WavWriter.cpp

@@ -1,20 +1,19 @@
 /*
  * Copyright (c) 2020, William McPherson <willmcpherson2@gmail.com>
+ * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include <LibAudio/WavWriter.h>
-#include <LibCore/DeprecatedFile.h>
 
 namespace Audio {
 
-WavWriter::WavWriter(StringView path, int sample_rate, u16 num_channels, u16 bits_per_sample)
-    : m_sample_rate(sample_rate)
-    , m_num_channels(num_channels)
-    , m_bits_per_sample(bits_per_sample)
+ErrorOr<NonnullOwnPtr<WavWriter>> WavWriter::create_from_file(StringView path, int sample_rate, u16 num_channels, u16 bits_per_sample)
 {
-    set_file(path);
+    auto wav_writer = TRY(adopt_nonnull_own_or_enomem(new (nothrow) WavWriter(sample_rate, num_channels, bits_per_sample)));
+    TRY(wav_writer->set_file(path));
+    return wav_writer;
 }
 
 WavWriter::WavWriter(int sample_rate, u16 num_channels, u16 bits_per_sample)
@@ -30,18 +29,15 @@ WavWriter::~WavWriter()
         finalize();
 }
 
-void WavWriter::set_file(StringView path)
+ErrorOr<void> WavWriter::set_file(StringView path)
 {
-    m_file = Core::DeprecatedFile::construct(path);
-    if (!m_file->open(Core::OpenMode::ReadWrite)) {
-        m_error_string = DeprecatedString::formatted("Can't open file: {}", m_file->error_string());
-        return;
-    }
-    m_file->seek(44);
+    m_file = TRY(Core::File::open(path, Core::File::OpenMode::ReadWrite));
+    TRY(m_file->seek(44, SeekMode::SetPosition));
     m_finalized = false;
+    return {};
 }
 
-void WavWriter::write_samples(Span<Sample> samples)
+ErrorOr<void> WavWriter::write_samples(Span<Sample> samples)
 {
     m_data_sz += samples.size() * sizeof(Sample);
 
@@ -50,66 +46,76 @@ void WavWriter::write_samples(Span<Sample> samples)
         u16 left = static_cast<i16>(sample.left * static_cast<float>(1 << m_bits_per_sample));
         u16 right = static_cast<i16>(sample.right * static_cast<float>(1 << m_bits_per_sample));
         // FIXME: This ignores endianness.
-        m_file->write(bit_cast<u8 const*>(&left), sizeof(u16));
-        m_file->write(bit_cast<u8 const*>(&right), sizeof(u16));
+        TRY(m_file->write_value(left));
+        TRY(m_file->write_value(right));
     }
+
+    return {};
 }
 
 void WavWriter::finalize()
 {
     VERIFY(!m_finalized);
     m_finalized = true;
-    if (m_file) {
-        m_file->seek(0);
-        write_header();
+
+    if (m_file->is_open()) {
+        auto result = [&]() -> ErrorOr<void> {
+            TRY(m_file->seek(0, SeekMode::SetPosition));
+            return TRY(write_header());
+        }();
+
+        if (result.is_error())
+            dbgln("Failed to finalize WavWriter: {}", result.error());
         m_file->close();
     }
     m_data_sz = 0;
 }
 
-void WavWriter::write_header()
+ErrorOr<void> WavWriter::write_header()
 {
     // "RIFF"
     static u32 riff = 0x46464952;
-    m_file->write(reinterpret_cast<u8*>(&riff), sizeof(riff));
+    TRY(m_file->write_value(riff));
 
     // Size of data + (size of header - previous field - this field)
     u32 sz = m_data_sz + (44 - 4 - 4);
-    m_file->write(reinterpret_cast<u8*>(&sz), sizeof(sz));
+    TRY(m_file->write_value(sz));
 
     // "WAVE"
     static u32 wave = 0x45564157;
-    m_file->write(reinterpret_cast<u8*>(&wave), sizeof(wave));
+    TRY(m_file->write_value(wave));
 
     // "fmt "
     static u32 fmt_id = 0x20746D66;
-    m_file->write(reinterpret_cast<u8*>(&fmt_id), sizeof(fmt_id));
+    TRY(m_file->write_value(fmt_id));
 
     // Size of the next 6 fields
     static u32 fmt_size = 16;
-    m_file->write(reinterpret_cast<u8*>(&fmt_size), sizeof(fmt_size));
+    TRY(m_file->write_value(fmt_size));
 
     // 1 for PCM
     static u16 audio_format = 1;
-    m_file->write(reinterpret_cast<u8*>(&audio_format), sizeof(audio_format));
+    TRY(m_file->write_value(audio_format));
 
-    m_file->write(reinterpret_cast<u8*>(&m_num_channels), sizeof(m_num_channels));
+    TRY(m_file->write_value(m_num_channels));
 
-    m_file->write(reinterpret_cast<u8*>(&m_sample_rate), sizeof(m_sample_rate));
+    TRY(m_file->write_value(m_sample_rate));
 
     u32 byte_rate = m_sample_rate * m_num_channels * (m_bits_per_sample / 8);
-    m_file->write(reinterpret_cast<u8*>(&byte_rate), sizeof(byte_rate));
+    TRY(m_file->write_value(byte_rate));
 
     u16 block_align = m_num_channels * (m_bits_per_sample / 8);
-    m_file->write(reinterpret_cast<u8*>(&block_align), sizeof(block_align));
+    TRY(m_file->write_value(block_align));
 
-    m_file->write(reinterpret_cast<u8*>(&m_bits_per_sample), sizeof(m_bits_per_sample));
+    TRY(m_file->write_value(m_bits_per_sample));
 
     // "data"
     static u32 chunk_id = 0x61746164;
-    m_file->write(reinterpret_cast<u8*>(&chunk_id), sizeof(chunk_id));
+    TRY(m_file->write_value(chunk_id));
 
-    m_file->write(reinterpret_cast<u8*>(&m_data_sz), sizeof(m_data_sz));
+    TRY(m_file->write_value(m_data_sz));
+
+    return {};
 }
 
 }

Userland/Libraries/LibAudio/WavWriter.h

@@ -11,7 +11,7 @@
 #include <AK/RefPtr.h>
 #include <AK/StringView.h>
 #include <LibAudio/Sample.h>
-#include <LibCore/DeprecatedFile.h>
+#include <LibCore/File.h>
 #include <LibCore/Forward.h>
 
 namespace Audio {
@@ -21,32 +21,26 @@ class WavWriter {
     AK_MAKE_NONMOVABLE(WavWriter);
 
 public:
-    WavWriter(StringView path, int sample_rate = 44100, u16 num_channels = 2, u16 bits_per_sample = 16);
+    static ErrorOr<NonnullOwnPtr<WavWriter>> create_from_file(StringView path, int sample_rate = 44100, u16 num_channels = 2, u16 bits_per_sample = 16);
     WavWriter(int sample_rate = 44100, u16 num_channels = 2, u16 bits_per_sample = 16);
     ~WavWriter();
 
-    bool has_error() const { return !m_error_string.is_null(); }
-    char const* error_string() const { return m_error_string.characters(); }
-
-    void write_samples(Span<Sample> samples);
+    ErrorOr<void> write_samples(Span<Sample> samples);
     void finalize(); // You can finalize manually or let the destructor do it.
 
     u32 sample_rate() const { return m_sample_rate; }
     u16 num_channels() const { return m_num_channels; }
     u16 bits_per_sample() const { return m_bits_per_sample; }
-    RefPtr<Core::DeprecatedFile> file() const { return m_file; }
+    Core::File& file() const { return *m_file; }
 
-    void set_file(StringView path);
+    ErrorOr<void> set_file(StringView path);
     void set_num_channels(int num_channels) { m_num_channels = num_channels; }
     void set_sample_rate(int sample_rate) { m_sample_rate = sample_rate; }
     void set_bits_per_sample(int bits_per_sample) { m_bits_per_sample = bits_per_sample; }
 
-    void clear_error() { m_error_string = DeprecatedString(); }
-
 private:
-    void write_header();
-    RefPtr<Core::DeprecatedFile> m_file;
-    DeprecatedString m_error_string;
+    ErrorOr<void> write_header();
+    OwnPtr<Core::File> m_file;
     bool m_finalized { false };
 
     u32 m_sample_rate;