Remove useless computation. After the pthread_cond_wait loop there are at least MIN(od->bufferSize, size) free bytes in the buffer. Thus MIN(od->bufferSize - od->len, size) is always equal to MIN(od->bufferSize, size).

src/output/osx_plugin.c

@@ -330,8 +330,6 @@ osx_play(void *data, const char *playChunk, size_t size)
 			pthread_cond_wait(&od->condition, &od->mutex);
 		}
 
-		bytesToCopy = od->bufferSize - od->len;
-		bytesToCopy = bytesToCopy < size ? bytesToCopy : size;
 		size -= bytesToCopy;
 		od->len += bytesToCopy;