feat(spectool): Optimize .spec file size by trimming trailing zeros

Implements logic to remove unused trailing zero frames from spectrogram data before saving, reducing file size and improving loading efficiency.

1 files changed, 18 insertions, 0 deletions

diff --git a/tools/spectool.cc b/tools/spectool.cc
index e57e77b..954aa52 100644
--- a/tools/spectool.cc
+++ b/tools/spectool.cc
@@ -67,6 +67,24 @@ int analyze_audio(const char *in_path, const char *out_path) {
 
   ma_decoder_uninit(&decoder);
 
+  // Trim trailing zero frames
+  int last_frame = spec_data.size() / DCT_SIZE;
+  while (last_frame > 0) {
+    bool all_zeros = true;
+    for (int i = 0; i < DCT_SIZE; ++i) {
+      if (spec_data[ (last_frame - 1) * DCT_SIZE + i ] != 0.0f) {
+        all_zeros = false;
+        break;
+      }
+    }
+    if (all_zeros) {
+      last_frame--;
+    } else {
+      break;
+    }
+  }
+  spec_data.resize(last_frame * DCT_SIZE);
+
   // Write to .spec file
   FILE *f_out = fopen(out_path, "wb");
   if (!f_out) {