Audio Handling and simple GUI

- Audio Playback crashes the App due to an access violation rn
- GUI will get a overhaul later, might switch to QT
- SDK later on

ApfelDAW.sln

@@ -0,0 +1,31 @@
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+EndProject
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+		SolutionGuid = {3779F40C-D8D6-4877-8316-981E5772D63B}
+	EndGlobalSection
+EndGlobal

ApfelDAW/ApfelDAW.vcxproj

@@ -0,0 +1,144 @@
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+    <ProjectGuid>{2eccb40b-e250-4f78-87b2-2beb3d59e571}</ProjectGuid>
+    <RootNamespace>ApfelDAW</RootNamespace>
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+    <ClCompile Include="gui.cpp" />
+    <ClCompile Include="main.cpp" />
+    <ClCompile Include="trackeditor.cpp" />
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ApfelDAW/ApfelDAW.vcxproj.filters

@@ -0,0 +1,42 @@
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+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
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+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="trackeditor.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
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+  </ItemGroup>
+</Project>

ApfelDAW/daw.cpp

@@ -0,0 +1,148 @@
+#include "daw.h"
+#include <sndfile.h>
+#include <portaudio.h>
+#include <stdexcept>
+#include <iostream>
+#include <thread>
+#include <string>
+
+static int audioCallback(const void* inputBuffer, void* outputBuffer,
+    unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo* timeInfo,
+    PaStreamCallbackFlags statusFlags, void* userData) {
+    auto* track = reinterpret_cast<Track*>(userData);
+    auto* out = static_cast<float*>(outputBuffer);
+
+    static size_t position = 0;
+    size_t remaining = track->audioData.size() - position;
+    size_t toCopy = std::min<size_t>(framesPerBuffer * track->channels, remaining);
+
+    std::copy(track->audioData.begin() + position, track->audioData.begin() + position + toCopy, out);
+    position += toCopy;
+
+    if (toCopy < framesPerBuffer * track->channels) {
+        std::fill(out + toCopy, out + framesPerBuffer * track->channels, 0.0f);
+        position = 0;
+        return paComplete;
+    }
+
+    return paContinue;
+}
+
+void DAW::addTrack(const std::string& filePath) {
+    Track track;
+    loadAudio(filePath, track);
+    tracks.push_back(track);
+}
+
+void DAW::removeTrack(int index) {
+    if (index >= 0 && index < tracks.size()) {
+        tracks.erase(tracks.begin() + index);
+    }
+}
+
+std::vector<Track>& DAW::getTracks() {
+    return tracks;
+}
+
+void DAW::loadAudio(const std::string& filePath, Track& track) {
+    SF_INFO sfInfo;
+    SNDFILE* sndFile = sf_open(filePath.c_str(), SFM_READ, &sfInfo);
+    if (!sndFile) {
+        throw std::runtime_error("Failed to open audio file: " + filePath);
+    }
+
+    track.fileName = filePath;
+    track.sampleRate = sfInfo.samplerate;
+    track.channels = sfInfo.channels;
+    track.duration = static_cast<double>(sfInfo.frames) / sfInfo.samplerate;
+
+    size_t totalFrames = sfInfo.frames * sfInfo.channels;
+    track.audioData.resize(totalFrames);
+
+    sf_read_float(sndFile, track.audioData.data(), totalFrames);
+    sf_close(sndFile);
+}
+
+void DAW::play() {
+    if (tracks.empty() || playing) return;
+
+    playing = true;
+    Pa_Initialize();
+
+    auto& track = tracks[0];
+    PaStream* stream;
+    Pa_OpenDefaultStream(&stream, 0, track.channels, paFloat32, track.sampleRate,
+        256, audioCallback, &track);
+    Pa_StartStream(stream);
+
+    std::thread playbackThread([stream]() {
+        while (Pa_IsStreamActive(stream) == 1) {
+            std::this_thread::sleep_for(std::chrono::milliseconds(100));
+        }
+        Pa_CloseStream(stream);
+        Pa_Terminate();
+        });
+    playbackThread.detach();
+}
+
+static int mixedAudioCallback(const void* inputBuffer, void* outputBuffer,
+    unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo* timeInfo,
+    PaStreamCallbackFlags statusFlags, void* userData) {
+    static size_t position = 0;
+    auto* mixedAudio = static_cast<std::vector<float>*>(userData);
+    auto* out = static_cast<float*>(outputBuffer);
+
+    size_t toCopy = std::min<size_t>(framesPerBuffer * 2, mixedAudio->size() - position);
+    std::copy(mixedAudio->begin() + position, mixedAudio->begin() + position + toCopy, out);
+    position += toCopy;
+
+    if (position >= mixedAudio->size()) {
+        position = 0;
+        return paComplete;
+    }
+    return paContinue;
+}
+
+void DAW::playAll() {
+    if (tracks.empty() || playing) return;
+
+    playing = true;
+    Pa_Initialize();
+
+    size_t maxSamples = 0;
+    for (const auto& track : tracks) {
+        maxSamples = std::max(maxSamples, track.audioData.size());
+    }
+    std::vector<float> mixedAudio(maxSamples, 0.0f);
+
+    for (const auto& track : tracks) {
+        for (size_t i = 0; i < track.audioData.size(); ++i) {
+            mixedAudio[i] += track.audioData[i] / tracks.size();
+        }
+    }
+
+    PaStream* stream;
+    Pa_OpenDefaultStream(&stream, 0, 2, paFloat32, tracks[0].sampleRate, 256,
+        mixedAudioCallback, &mixedAudio);
+
+    Pa_StartStream(stream);
+
+    std::thread playbackThread([stream]() {
+        while (Pa_IsStreamActive(stream) == 1) {
+            std::this_thread::sleep_for(std::chrono::milliseconds(100));
+        }
+        Pa_CloseStream(stream);
+        Pa_Terminate();
+        });
+    playbackThread.detach();
+}
+
+
+void DAW::stop() {
+    playing = false;
+    Pa_Terminate();
+}
+
+bool DAW::isPlaying() const {
+    return playing;
+}

ApfelDAW/daw.h

@@ -0,0 +1,33 @@
+#ifndef DAW_H
+#define DAW_H
+
+#include <vector>
+#include <string>
+
+struct Track {
+    std::string fileName;
+    int sampleRate;
+    int channels;
+    double duration;
+    std::vector<float> audioData;
+};
+
+class DAW {
+public:
+    void addTrack(const std::string& filePath);
+    void removeTrack(int index);
+    std::vector<Track>& getTracks();
+
+    void play();
+    void playAll();
+    void stop();
+    bool isPlaying() const;
+
+private:
+    std::vector<Track> tracks;
+    bool playing = false;
+
+    void loadAudio(const std::string& filePath, Track& track);
+};
+
+#endif

ApfelDAW/gui.cpp

@@ -0,0 +1,85 @@
+#include "gui.h"
+#include "trackeditor.h"
+
+enum {
+    ID_PLAY_PAUSE = 1
+};
+
+BEGIN_EVENT_TABLE(GUI, wxFrame)
+EVT_BUTTON(ID_PLAY_PAUSE, GUI::OnPlayPause)
+EVT_KEY_DOWN(GUI::OnKeyDown)
+END_EVENT_TABLE()
+
+GUI::GUI(const wxString& title)
+    : wxFrame(nullptr, wxID_ANY, title, wxDefaultPosition, wxSize(600, 400)) {
+    auto* panel = new wxPanel(this, wxID_ANY);
+    auto* vbox = new wxBoxSizer(wxVERTICAL);
+
+    trackList = new wxListBox(panel, wxID_ANY);
+    vbox->Add(trackList, 1, wxEXPAND | wxALL, 10);
+
+    auto* hbox = new wxBoxSizer(wxHORIZONTAL);
+    auto* addBtn = new wxButton(panel, wxID_ANY, wxT("Add Track"));
+    auto* removeBtn = new wxButton(panel, wxID_ANY, wxT("Remove Track"));
+    auto* playPauseBtn = new wxButton(panel, ID_PLAY_PAUSE, wxT("Play/Pause"));
+    auto* trackEditorBtn = new wxButton(panel, wxID_ANY, "Open Track Editor");
+
+    hbox->Add(trackEditorBtn, 1, wxEXPAND | wxALL, 5);
+    hbox->Add(addBtn, 1, wxEXPAND | wxALL, 5);
+    hbox->Add(removeBtn, 1, wxEXPAND | wxALL, 5);
+    hbox->Add(playPauseBtn, 1, wxEXPAND | wxALL, 5);
+
+    vbox->Add(hbox, 0, wxALIGN_CENTER);
+    panel->SetSizer(vbox);
+
+    Connect(addBtn->GetId(), wxEVT_BUTTON, wxCommandEventHandler(GUI::OnAddTrack));
+    Connect(removeBtn->GetId(), wxEVT_BUTTON, wxCommandEventHandler(GUI::OnRemoveTrack));
+    trackEditorBtn->Bind(wxEVT_BUTTON, &GUI::OnOpenTrackEditor, this);
+}
+
+void GUI::OnOpenTrackEditor(wxCommandEvent& event) {
+    auto* editor = new TrackEditor(&daw);
+    editor->Show(true);
+}
+
+void GUI::OnAddTrack(wxCommandEvent& event) {
+    wxFileDialog openFileDialog(this, wxT("Select Audio File"), "", "",
+        "Audio Files (*.wav;*.mp3;*.flac)|*.wav;*.mp3;*.flac",
+        wxFD_OPEN | wxFD_FILE_MUST_EXIST);
+    if (openFileDialog.ShowModal() == wxID_CANCEL) return;
+
+    daw.addTrack(openFileDialog.GetPath().ToStdString());
+    UpdateTrackList();
+}
+
+void GUI::OnRemoveTrack(wxCommandEvent& event) {
+    int selection = trackList->GetSelection();
+    if (selection != wxNOT_FOUND) {
+        daw.removeTrack(selection);
+        UpdateTrackList();
+    }
+}
+
+void GUI::OnPlayPause(wxCommandEvent& event) {
+    if (daw.isPlaying()) {
+        daw.stop();
+    }
+    else {
+        daw.play();
+    }
+}
+
+void GUI::OnKeyDown(wxKeyEvent& event) {
+    if (event.GetKeyCode() == WXK_SPACE) {
+        wxCommandEvent dummyEvent;
+        OnPlayPause(dummyEvent);
+    }
+    event.Skip();
+}
+
+void GUI::UpdateTrackList() {
+    trackList->Clear();
+    for (const auto& track : daw.getTracks()) {
+        trackList->Append(wxString::FromUTF8(track.fileName));
+    }
+}

ApfelDAW/gui.h

@@ -0,0 +1,27 @@
+#ifndef GUI_H
+#define GUI_H
+
+#include <wx/wx.h>
+#include <wx/dnd.h>
+#include "daw.h"
+
+class GUI : public wxFrame {
+public:
+    GUI(const wxString& title);
+
+private:
+    DAW daw;
+    wxListBox* trackList;
+
+    void OnAddTrack(wxCommandEvent& event);
+    void OnRemoveTrack(wxCommandEvent& event);
+    void OnPlayPause(wxCommandEvent& event);
+    void OnOpenTrackEditor(wxCommandEvent& event);
+    void OnKeyDown(wxKeyEvent& event);
+
+    void UpdateTrackList();
+
+    DECLARE_EVENT_TABLE()
+};
+
+#endif

ApfelDAW/main.cpp

@@ -0,0 +1,13 @@
+#include <wx/wx.h>
+#include "gui.h"
+
+class ApfelDAWApp : public wxApp {
+public:
+    virtual bool OnInit() {
+        GUI* gui = new GUI("Apfel DAW");
+        gui->Show(true);
+        return true;
+    }
+};
+
+wxIMPLEMENT_APP(ApfelDAWApp);

ApfelDAW/trackeditor.cpp

@@ -0,0 +1,50 @@
+#include "trackeditor.h"
+
+FileDropTarget::FileDropTarget(wxListBox* listBox, DAW* daw)
+    : trackList(listBox), daw(daw) {}
+
+bool FileDropTarget::OnDropFiles(wxCoord x, wxCoord y, const wxArrayString& files) {
+    for (const auto& file : files) {
+        try {
+            daw->addTrack(file.ToStdString());
+            trackList->Append(file);
+        }
+        catch (const std::exception& e) {
+            wxMessageBox(e.what(), "Error", wxICON_ERROR);
+        }
+    }
+    return true;
+}
+
+TrackEditor::TrackEditor(DAW* daw)
+    : wxFrame(nullptr, wxID_ANY, "Track Editor", wxDefaultPosition, wxSize(600, 400)), daw(daw) {
+    auto* panel = new wxPanel(this, wxID_ANY);
+    auto* vbox = new wxBoxSizer(wxVERTICAL);
+
+    trackList = new wxListBox(panel, wxID_ANY);
+    auto* dropTarget = new FileDropTarget(trackList, daw);
+    trackList->SetDropTarget(dropTarget);
+
+    vbox->Add(trackList, 1, wxEXPAND | wxALL, 10);
+
+    auto* hbox = new wxBoxSizer(wxHORIZONTAL);
+    auto* playBtn = new wxButton(panel, wxID_ANY, "Play All");
+    auto* stopBtn = new wxButton(panel, wxID_ANY, "Stop");
+
+    hbox->Add(playBtn, 1, wxEXPAND | wxALL, 5);
+    hbox->Add(stopBtn, 1, wxEXPAND | wxALL, 5);
+
+    vbox->Add(hbox, 0, wxALIGN_CENTER);
+    panel->SetSizer(vbox);
+
+    Connect(playBtn->GetId(), wxEVT_BUTTON, wxCommandEventHandler(TrackEditor::OnPlay));
+    Connect(stopBtn->GetId(), wxEVT_BUTTON, wxCommandEventHandler(TrackEditor::OnStop));
+}
+
+void TrackEditor::OnPlay(wxCommandEvent& event) {
+    daw->playAll();
+}
+
+void TrackEditor::OnStop(wxCommandEvent& event) {
+    daw->stop();
+}

ApfelDAW/trackeditor.h

@@ -0,0 +1,30 @@
+#ifndef TRACKEDITOR_H
+#define TRACKEDITOR_H
+
+#include <wx/wx.h>
+#include <wx/dnd.h>
+#include "daw.h"
+
+class FileDropTarget : public wxFileDropTarget {
+public:
+    FileDropTarget(wxListBox* listBox, DAW* daw);
+    bool OnDropFiles(wxCoord x, wxCoord y, const wxArrayString& files) override;
+
+private:
+    wxListBox* trackList;
+    DAW* daw;
+};
+
+class TrackEditor : public wxFrame {
+public:
+    TrackEditor(DAW* daw);
+
+private:
+    DAW* daw;
+    wxListBox* trackList;
+
+    void OnPlay(wxCommandEvent& event);
+    void OnStop(wxCommandEvent& event);
+};
+
+#endif