Don't convert SND0 if it is already in AT3 format

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

pop-fe.py

@@ -380,6 +380,7 @@ def convert_snd0_to_at3(snd0, at3, duration, max_size, subdir = './'):
                 subprocess.run(['atracdenc/src/atracdenc', '--encode=atrac3', '-i', tmp_wav, '-o', tmp_snd0], check=True)
         except:
             print('XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\natracdenc not found.\nCan not create SND0.AT3\nPlease see README file for how to install atracdenc\nXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
+            return None
         print('Converting EA3 to AT3 file') if verbose else None
         temp_files.append(at3)
         create_riff(tmp_snd0, at3, number_of_samples=int(len(s['data']['data'])/4), max_data_size=0, loop=True)
@@ -878,6 +879,15 @@ def create_psp(dest, disc_ids, game_title, icon0, pic0, pic1, cue_files, cu2_fil
         True
 
     snd0_data = None
+    if snd0:
+        # Check if it is already in ATRAC3 format
+        with open(snd0, 'rb') as s:
+            buf = s.read(36)
+            if buf[:4] == b'RIFF' and buf[8:12] == b'WAVE' and struct.unpack_from('<H', buf, 20)[0] == 0x270:
+                print('SND0 is already in AT3 format. No conversion needed.')
+                s.seek(0)
+                snd0_data = s.read()
+                snd0 = None
     if snd0:
         try:
             temp_files.append(subdir + 'snd0_tmp.wav')
@@ -1042,7 +1052,14 @@ def create_ps3(dest, disc_ids, game_title, icon0, pic0, pic1, cue_files, cu2_fil
         of.write(GenerateSFO(sfo))
         temp_files.append(f + '/PARAM.SFO')
     if snd0:
-        subprocess.call(['ffmpeg', '-y', '-i', snd0, '-filter:a', 'atempo=0.91', '-ar', '44100', '-ac', '2', subdir + 'snd0_tmp.wav'])
+        # Check if it is already in ATRAC3 format
+        with open(snd0, 'rb') as s:
+            buf = s.read(36)
+            if buf[:4] == b'RIFF' and buf[8:12] == b'WAVE' and struct.unpack_from('<H', buf, 20)[0] == 0x270:
+                print('SND0 is already in AT3 format. No conversion needed.')
+                copy_file(snd0, f + '/SND0.AT3')
+                snd0 = None
+    if snd0:
         try:
             temp_files.append(subdir + 'snd0_tmp.wav')
             if os.name == 'posix':