Fix error from reading past end of file

Save chapter start times to file
Note that get_chapter_text doesn't work

py_aax_decode/native.py

@@ -34,6 +34,12 @@ def main(in_file, out_file, dll_path=None):
     authenticate(*a)
 
     print('c', channels, 's', sample_rate)
+    
+    n_chapters = get_chapter_count(*a)
+    chapter_times = [get_chapter_start_time(*a, i) for i in range(n_chapters)]
+	
+    with open(out_file + '.txt', 'w') as f:
+        [f.write(str(ti) + '\n') for ti in chapter_times]
 	
     enc_buf = ctypes.create_string_buffer(0x400)
     dec_buf = ctypes.create_string_buffer(0x400 * 200)
@@ -116,7 +122,8 @@ def get_encoded_audio(dll, handle, buf=None):
     data_len = ctypes.c_uint()
     res = dll.AAXGetEncodedAudio(handle, buf, len(buf), byref(data_len))
 
-    if res != 0:
+    if res not in (0, -24):
+		#-24 is "read past end of data"
         raise Exception('AAXGetEncodedAudio: {}'.format(res))
 
     return buf, data_len.value
@@ -136,16 +143,22 @@ def decode_pcm_frame(dll, handle, in_buf, in_len, out_buf=None):
 
 
 def get_chapter_text(dll, handle, chapter_num, buf=None):
+    '''
+    Possibly doesn't exist?
+	'''
     if buf is None:
-        buf = ctypes.create_string_buffer(0x400)
+        buf = ctypes.create_string_buffer(0x800)
 
     data_len = ctypes.c_uint()
-    res = dll.AAXGetChapterText(handle, chapter_num, buf, len(buf), byref(data_len))
+    res = dll.AAXGetChapterText(handle, ctypes.c_uint(chapter_num), buf, len(buf), byref(data_len))
 
+    if data_len.value == 0:
+        return ''
+	
     if res != 0:
         raise Exception('AAXGetChapterText: {}'.format(res))
 
-    return buf, data_len.value
+    return bytearray(buf[:data_len.value]).decode('utf-8')
 
 
 def get_metadata(dll, handle, mdn):
@@ -213,7 +226,7 @@ def get_playback_position(dll, handle):
 
 def get_chapter_start_time(dll, handle, chapter):
     position = ctypes.c_uint()
-    res = dll.AAXGetChapterStartTime(handle, byref(position), chapter)
+    res = dll.AAXGetChapterStartTime(handle, ctypes.c_uint(chapter), byref(position))
 
     if res != 0:
         raise Exception('AAXGetChapterStartTime: {}'.format(res))