Add audio playback to gui

main.cpp

@@ -10,7 +10,8 @@
 #include <atomic>
 #include <nlohmann/json.hpp>
 #include <fstream>
-
+#define MINIAUDIO_IMPLEMENTATION
+#include "miniaudio.h"
 #include "tinyfiledialogs.h"
 
 
@@ -31,6 +32,11 @@ float bpm = 120.0f; // Default BPM
 float zoom_level = 1.0f; // Zoom level
 float pan_offset = 0.0f; // Pan offset
 
+// audio stuff
+ma_sound sound;
+ma_engine engine;
+bool audioLoaded = false;
+
 
 const int num_channels = 512;
 unsigned char buffer[num_channels] = { 0 };
@@ -87,6 +93,11 @@ int main() {
         return 1;
     }
 
+    if (ma_engine_init(NULL, &engine) != MA_SUCCESS) {
+        std::cerr << "Failed to initialize audio engine." << std::endl;
+        return -1;
+    }
+
     GLFWwindow* window = initOpenGL();
     if (!window) {
         CloseHandle(hSerial);
@@ -126,6 +137,8 @@ int main() {
     glfwTerminate();
     CloseHandle(hSerial);
 
+    ma_engine_uninit(&engine);
+
     return 0;
 }
 
@@ -195,6 +208,28 @@ void loadMarkersFromFile(const std::string& filename) {
     }
 }
 
+void loadAndPlayAudio(const std::string& filename) {
+    if (audioLoaded) {
+        ma_sound_uninit(&sound);
+    }
+
+    if (ma_sound_init_from_file(&engine, filename.c_str(), MA_SOUND_FLAG_STREAM, NULL, NULL, &sound) == MA_SUCCESS) {
+        audioLoaded = true;
+        ma_sound_start(&sound);
+    }
+    else {
+        std::cerr << "Failed to load audio file: " << filename << std::endl;
+    }
+}
+
+std::string OpenAudioFileDialog() {
+    const char* filterPatterns[2] = { "*.mp3", "*.wav" };
+    const char* filename = tinyfd_openFileDialog("Select an audio file", "", 2, filterPatterns, NULL, 0);
+    if (filename) {
+        return std::string(filename);
+    }
+    return "";
+}
 
 GLFWwindow* initOpenGL() {
     if (!glfwInit()) {
@@ -276,6 +311,13 @@ void renderImGui() {
         }
     }
 
+    if (ImGui::Button("Load Audio File")) {
+        std::string filename = OpenAudioFileDialog();
+        if (!filename.empty()) {
+            loadAndPlayAudio(filename);
+        }
+    }
+
 
     // Create sliders for the first three DMX channels
     ImGui::SliderInt("Channel 1", &channel1, 0, 255);
@@ -290,14 +332,46 @@ void renderImGui() {
     // Allow user to set the total duration of the timeline and BPM
     ImGui::SliderFloat("Timeline Duration (seconds)", &timeline_duration, 1.0f, 300.0f);
     ImGui::SliderFloat("BPM", &bpm, 30.0f, 240.0f);
+    ImGui::SameLine();
+    ImGui::SetNextItemWidth(50);
+    if (ImGui::InputFloat("##BPMInput", &bpm, 0.0f, 0.0f, "%.1f")) {
+        if (bpm < 30.0f) bpm = 30.0f;
+        if (bpm > 240.0f) bpm = 240.0f;
+    }
+
 
     // Play/Pause button
     if (ImGui::Button(is_playing ? "Pause" : "Play")) {
         is_playing = !is_playing;
         if (is_playing) {
             playback_start_time = static_cast<float>(glfwGetTime()) - timeline_position;
+            if (audioLoaded) {
+                ma_uint64 frameCount;
+                ma_sound_get_length_in_pcm_frames(&sound, &frameCount);
+
+                // Calculate the frame to seek to based on the timeline position
+                ma_uint64 targetFrame = static_cast<ma_uint64>((timeline_position / timeline_duration) * frameCount);
+                ma_sound_seek_to_pcm_frame(&sound, targetFrame);
+
+                ma_sound_start(&sound);
             }
         }
+        else {
+            if (audioLoaded) {
+                ma_sound_stop(&sound);
+            }
+        }
+    }
+
+    // Stop Music button
+    ImGui::SameLine();
+    if (ImGui::Button("Stop Music")) {
+        if (audioLoaded) {
+            ma_sound_stop(&sound);
+        }
+        is_playing = false;
+        timeline_position = 0.0f;
+    }
 
     // Time Slider (Timeline Position)
     ImGui::SliderFloat("Timeline Position", &timeline_position, 0.0f, timeline_duration, "%.2f sec");
@@ -356,22 +430,24 @@ void renderImGui() {
         current_time = static_cast<float>(glfwGetTime()) - playback_start_time;
         timeline_position = current_time;
 
-        // Trigger markers during playback
         for (const auto& marker : markers) {
             float marker_time = std::get<0>(marker) * timeline_duration;
-            if (current_time >= marker_time && current_time < marker_time + 0.025f) { // Slight tolerance for timing precision
+            if (current_time >= marker_time && current_time < marker_time + 0.025f) {
                 buffer[0] = std::get<1>(marker);
                 buffer[1] = std::get<2>(marker);
                 buffer[2] = std::get<3>(marker);
             }
         }
 
-        // Stop playback when the timeline reaches the end
         if (timeline_position >= timeline_duration) {
             is_playing = false;
             timeline_position = timeline_duration;
+            if (audioLoaded) {
+                ma_sound_stop(&sound);
             }
         }
+    }
+
 
     // Display added markers with their RGB values and time
     for (const auto& marker : markers) {