Fix frame count bug

ffmini.cpp

@@ -3,6 +3,7 @@
 #include <memory>
 #include <vector>
 #include <ranges>
+#include <chrono>
 
 #include "fmt/format.h"
 #include "miniaudio.h"
@@ -93,7 +94,6 @@ public:
 private:
     std::size_t m_frame_count{0};
 };
-using audio_track_ref_t = std::shared_ptr<audio_track>;
 
 auto ffmpeg_error_str(int err) {
     static char str[AV_ERROR_MAX_STRING_SIZE]{};
@@ -162,7 +162,7 @@ public:
         while (frame_read < frame_count) {
             auto track = std::static_pointer_cast<audio_track>(m_tracks[0]);
             if (track->empty()) read(track);
-            frame_read += track->read_pcm_frame(output, frame_count);
+            frame_read += track->read_pcm_frame(output, frame_count - frame_read);
         }
     }
 
@@ -225,9 +225,12 @@ auto callback([[maybe_unused]]ma_device* device, [[maybe_unused]]void* output, [
 
 auto entry() -> void {
     media decoder{};
-    decoder.load("C:/Users/miku/Downloads/Porter Robinson - Trying to Feel Alive (Official Audio).webm");
-    fmt::print("{}\n", decoder.str());
+    decoder.load("/Users/k/Downloads/tryingtofeelalive.mp4");
+    fmt::print("{}", decoder.str());
+    if (decoder.tracks().empty())
+        throw std::runtime_error("There are no tracks readable.");
 
+    // TODO: Deocde and cache it in the background.
     auto track = std::static_pointer_cast<audio_track>(decoder.tracks()[0]);
 
     ma_device device;